v1.2.0: Track Metadata Screen, Hi-Res fix, Settings navigation fix

.github/FUNDING.yml

@@ -1,4 +0,0 @@
-github: zarzet
-ko_fi: zarzet
-buy_me_a_coffee: zarzet
-

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -1,123 +0,0 @@
-name: Bug Report
-description: Report a bug or unexpected behavior
-title: "[Bug]: "
-labels: ["bug"]
-body:
-  - type: markdown
-    attributes:
-      value: |
-        Thanks for taking the time to report a bug! Please fill out the form below.
-
-  - type: checkboxes
-    id: checklist
-    attributes:
-      label: Checklist
-      description: Please confirm the following before submitting
-      options:
-        - label: I have searched existing issues and this bug hasn't been reported yet
-          required: true
-        - label: I am using the latest version of SpotiFLAC (Stable Version)
-          required: true
-
-  - type: textarea
-    id: description
-    attributes:
-      label: Bug Description
-      description: A clear and concise description of what the bug is
-      placeholder: Describe the bug...
-    validations:
-      required: true
-
-  - type: textarea
-    id: steps
-    attributes:
-      label: Steps to Reproduce
-      description: Steps to reproduce the behavior
-      placeholder: |
-        1. Go to '...'
-        2. Click on '...'
-        3. See error
-    validations:
-      required: true
-
-  - type: textarea
-    id: expected
-    attributes:
-      label: Expected Behavior
-      description: What did you expect to happen?
-      placeholder: Describe what you expected...
-    validations:
-      required: true
-
-  - type: textarea
-    id: actual
-    attributes:
-      label: Actual Behavior
-      description: What actually happened?
-      placeholder: Describe what actually happened...
-    validations:
-      required: true
-
-  - type: input
-    id: version
-    attributes:
-      label: App Version
-      description: Which version of SpotiFLAC are you using? (Check in Settings > About)
-      placeholder: "e.g., v2.2.0"
-    validations:
-      required: true
-
-  - type: dropdown
-    id: platform
-    attributes:
-      label: Platform
-      description: Which platform are you using?
-      options:
-        - Android
-        - iOS
-    validations:
-      required: true
-
-  - type: input
-    id: device
-    attributes:
-      label: Device & OS Version
-      description: What device and OS version are you using?
-      placeholder: "e.g., Samsung Galaxy S24, Android 14"
-    validations:
-      required: true
-
-  - type: dropdown
-    id: download-service
-    attributes:
-      label: Download Service
-      description: Which download service were you using when the bug occurred?
-      options:
-        - Tidal
-        - Qobuz
-        - Amazon Music
-        - Deezer (search only)
-        - Not applicable
-    validations:
-      required: true
-
-  - type: textarea
-    id: logs
-    attributes:
-      label: Logs / Screenshots
-      description: |
-        If applicable, add logs or screenshots to help explain your problem.
-        
-        **To get logs:**
-        1. Go to Settings > Options > Detailed Logging (turn ON)
-        2. Reproduce the bug
-        3. Go to Settings > Logs
-        4. Tap Share button to export logs
-      placeholder: Paste logs or drag & drop screenshots here...
-
-  - type: textarea
-    id: additional
-    attributes:
-      label: Additional Context
-      description: Any other context about the problem
-      placeholder: Add any other context...

.github/ISSUE_TEMPLATE/config.yml

@@ -1,8 +0,0 @@
-blank_issues_enabled: false
-contact_links:
-  - name: README
-    url: https://github.com/zarzet/SpotiFLAC-Mobile#readme
-    about: Check the README for setup instructions and FAQ
-  - name: Extension Development Guide
-    url: https://zarz.moe/docs
-    about: Documentation for building SpotiFLAC extensions

.github/ISSUE_TEMPLATE/download_issue.yml

@@ -1,111 +0,0 @@
-name: Download Issue
-description: Report issues with downloading specific tracks or albums
-title: "[Download]: "
-labels: ["download-issue"]
-body:
-  - type: markdown
-    attributes:
-      value: |
-        Having trouble downloading a specific track or album? Please provide details below.
-
-  - type: checkboxes
-    id: checklist
-    attributes:
-      label: Checklist
-      description: Please confirm the following before submitting
-      options:
-        - label: I have tried downloading with a different service (Tidal/Qobuz/Amazon)
-          required: true
-        - label: I am using the latest version of SpotiFLAC (Stable Version)
-          required: true
-
-  - type: dropdown
-    id: issue-type
-    attributes:
-      label: Issue Type
-      description: What kind of download issue are you experiencing?
-      options:
-        - Track not found on service
-        - Wrong track downloaded
-        - Download fails/errors
-        - Metadata incorrect
-        - Audio quality issue
-        - Other
-    validations:
-      required: true
-
-  - type: input
-    id: spotify-url
-    attributes:
-      label: Spotify URL
-      description: The Spotify URL of the track/album you're trying to download
-      placeholder: "https://open.spotify.com/track/..."
-    validations:
-      required: true
-
-  - type: input
-    id: track-info
-    attributes:
-      label: Track Info
-      description: Artist name and track title
-      placeholder: "Artist - Track Title"
-    validations:
-      required: true
-
-  - type: dropdown
-    id: download-service
-    attributes:
-      label: Download Service
-      description: Which service did you try to download from?
-      options:
-        - Tidal
-        - Qobuz
-        - Amazon Music
-        - All services
-    validations:
-      required: true
-
-  - type: dropdown
-    id: search-service
-    attributes:
-      label: Search Service
-      description: Which search service are you using?
-      options:
-        - Spotify
-        - Deezer
-    validations:
-      required: true
-
-  - type: textarea
-    id: description
-    attributes:
-      label: Description
-      description: Describe the issue in detail
-      placeholder: |
-        What happened? What did you expect?
-        If wrong track was downloaded, what track was downloaded instead?
-    validations:
-      required: true
-
-  - type: input
-    id: version
-    attributes:
-      label: App Version
-      description: Which version of SpotiFLAC are you using?
-      placeholder: "e.g., v2.2.0"
-    validations:
-      required: true
-
-  - type: textarea
-    id: screenshots
-    attributes:
-      label: Screenshots / Logs
-      description: |
-        If applicable, add screenshots or logs.
-        
-        **To get logs:**
-        1. Go to Settings > Options > Detailed Logging (turn ON)
-        2. Try downloading the track again
-        3. Go to Settings > Logs
-        4. Tap Share button to export logs
-      placeholder: Drag & drop screenshots or paste logs here...

.github/ISSUE_TEMPLATE/extension_feature_request.yml

@@ -1,117 +0,0 @@
-name: Extension API Feature Request
-description: Request new API features or capabilities for extension development
-title: "[Extension API]: "
-labels: ["enhancement", "extension-api"]
-body:
-  - type: markdown
-    attributes:
-      value: |
-        Thanks for helping improve the SpotiFLAC Extension API! 
-        This form is for extension developers who need new features or capabilities that don't exist yet.
-
-  - type: checkboxes
-    id: checklist
-    attributes:
-      label: Checklist
-      description: Please confirm the following before submitting
-      options:
-        - label: I have read the [Extension Development Guide](https://github.com/zarzet/SpotiFLAC-Mobile/blob/main/docs/EXTENSION_DEVELOPMENT.md)
-          required: true
-        - label: I have searched existing issues and this API feature hasn't been requested yet
-          required: true
-
-  - type: textarea
-    id: extension_goal
-    attributes:
-      label: What are you trying to build?
-      description: Describe the extension or feature you're developing
-      placeholder: "I'm building an extension that downloads from [service name] / provides metadata from [source]..."
-    validations:
-      required: true
-
-  - type: textarea
-    id: current_limitation
-    attributes:
-      label: Current API Limitation
-      description: What's missing or limiting in the current extension API?
-      placeholder: |
-        The current API doesn't support:
-        - [missing feature 1]
-        - [missing feature 2]
-        
-        This prevents me from...
-    validations:
-      required: true
-
-  - type: textarea
-    id: proposed_api
-    attributes:
-      label: Proposed API / Feature
-      description: Describe the API or feature you'd like to see added
-      placeholder: |
-        I would like to have:
-        - A new function `api.newFeature()` that does X
-        - A new manifest field `newOption` that enables Y
-        - Access to Z capability...
-    validations:
-      required: true
-
-  - type: textarea
-    id: use_case
-    attributes:
-      label: Use Case Example
-      description: Provide a code example of how you would use this feature
-      placeholder: |
-        ```javascript
-        // Example usage in extension code
-        function download(request, progressCallback) {
-          const result = api.proposedFeature(params);
-          // ...
-        }
-        ```
-    validations:
-      required: false
-
-  - type: dropdown
-    id: api_category
-    attributes:
-      label: API Category
-      description: What category does this feature fall under?
-      options:
-        - HTTP/Network API
-        - File System API
-        - Storage API
-        - FFmpeg/Audio Processing
-        - Manifest Options
-        - Runtime Functions
-        - UI Integration
-        - Authentication
-        - Other
-    validations:
-      required: true
-
-  - type: dropdown
-    id: priority
-    attributes:
-      label: How critical is this for your extension?
-      options:
-        - Blocker - Cannot build my extension without this
-        - High - Major functionality depends on this
-        - Medium - Would significantly improve my extension
-        - Low - Nice to have
-    validations:
-      required: true
-
-  - type: textarea
-    id: workaround
-    attributes:
-      label: Current Workaround
-      description: Are you using any workaround currently? If so, describe it.
-      placeholder: "Currently I'm working around this by..."
-
-  - type: textarea
-    id: additional
-    attributes:
-      label: Additional Context
-      description: Add any other context, links to similar APIs, or examples from other platforms
-      placeholder: "Similar feature in other platforms: ..."

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -1,66 +0,0 @@
-name: Feature Request
-description: Suggest a new feature or improvement
-title: "[Feature]: "
-labels: ["enhancement"]
-body:
-  - type: markdown
-    attributes:
-      value: |
-        Thanks for suggesting a feature! Please fill out the form below.
-
-  - type: checkboxes
-    id: checklist
-    attributes:
-      label: Checklist
-      description: Please confirm the following before submitting
-      options:
-        - label: I have searched existing issues and this feature hasn't been requested yet
-          required: true
-
-  - type: textarea
-    id: problem
-    attributes:
-      label: Problem / Motivation
-      description: Is your feature request related to a problem? Please describe.
-      placeholder: "A clear description of what the problem is. Ex: I'm always frustrated when..."
-    validations:
-      required: true
-
-  - type: textarea
-    id: solution
-    attributes:
-      label: Proposed Solution
-      description: Describe the solution you'd like
-      placeholder: A clear description of what you want to happen...
-    validations:
-      required: true
-
-  - type: textarea
-    id: alternatives
-    attributes:
-      label: Alternatives Considered
-      description: Describe any alternative solutions or features you've considered
-      placeholder: Other approaches you've thought about...
-
-  - type: dropdown
-    id: category
-    attributes:
-      label: Category
-      description: What category does this feature fall under?
-      options:
-        - UI/UX Improvement
-        - Download Feature
-        - New Service Integration
-        - Metadata/Tagging
-        - Performance
-        - Settings/Configuration
-        - Other
-    validations:
-      required: true
-
-  - type: textarea
-    id: additional
-    attributes:
-      label: Additional Context
-      description: Add any other context, mockups, or screenshots about the feature request
-      placeholder: Add any other context or screenshots...

.github/workflows/android-build.yml

@@ -0,0 +1,75 @@
+name: Android Build
+
+on:
+  push:
+    tags:
+      - 'v*'
+  workflow_dispatch:
+
+jobs:
+  build-android:
+    runs-on: ubuntu-latest
+    
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '17'
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.21'
+          cache-dependency-path: go_backend/go.sum
+
+      - name: Install Android SDK & NDK
+        uses: android-actions/setup-android@v3
+
+      - name: Install gomobile
+        run: |
+          go install golang.org/x/mobile/cmd/gomobile@latest
+          gomobile init
+
+      - name: Build Go backend for Android
+        working-directory: go_backend
+        run: |
+          mkdir -p ../android/app/libs
+          gomobile bind -target=android -androidapi 24 -o ../android/app/libs/gobackend.aar .
+        env:
+          CGO_ENABLED: 1
+
+      - name: Setup Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          channel: 'stable'
+          cache: true
+
+      - name: Get Flutter dependencies
+        run: flutter pub get
+
+      - name: Generate app icons
+        run: dart run flutter_launcher_icons
+
+      - name: Build APK (Release)
+        run: flutter build apk --release
+
+      - name: Build App Bundle (Release)
+        run: flutter build appbundle --release
+
+      - name: Upload APK artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: SpotiFLAC-Android-APK
+          path: build/app/outputs/flutter-apk/app-release.apk
+          retention-days: 30
+
+      - name: Upload AAB artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: SpotiFLAC-Android-AAB
+          path: build/app/outputs/bundle/release/app-release.aab
+          retention-days: 30

.github/workflows/auto-release.yml

@@ -0,0 +1,69 @@
+name: Auto Release on Version Bump
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'pubspec.yaml'
+
+jobs:
+  check-version:
+    runs-on: ubuntu-latest
+    outputs:
+      version_changed: ${{ steps.check.outputs.changed }}
+      new_version: ${{ steps.check.outputs.version }}
+    
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 2
+
+      - name: Check if version changed
+        id: check
+        run: |
+          # Get current version
+          CURRENT_VERSION=$(grep '^version:' pubspec.yaml | sed 's/version: //' | cut -d'+' -f1)
+          
+          # Get previous version
+          git show HEAD~1:pubspec.yaml > /tmp/old_pubspec.yaml 2>/dev/null || echo "version: 0.0.0" > /tmp/old_pubspec.yaml
+          PREVIOUS_VERSION=$(grep '^version:' /tmp/old_pubspec.yaml | sed 's/version: //' | cut -d'+' -f1)
+          
+          echo "Current version: $CURRENT_VERSION"
+          echo "Previous version: $PREVIOUS_VERSION"
+          
+          if [ "$CURRENT_VERSION" != "$PREVIOUS_VERSION" ]; then
+            echo "Version changed!"
+            echo "changed=true" >> $GITHUB_OUTPUT
+            echo "version=v$CURRENT_VERSION" >> $GITHUB_OUTPUT
+          else
+            echo "Version unchanged"
+            echo "changed=false" >> $GITHUB_OUTPUT
+          fi
+
+  create-tag-and-trigger-release:
+    needs: check-version
+    if: needs.check-version.outputs.version_changed == 'true'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      actions: write
+    
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Create and push tag
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git tag ${{ needs.check-version.outputs.new_version }}
+          git push origin ${{ needs.check-version.outputs.new_version }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Trigger Release workflow
+        run: |
+          gh workflow run release.yml -f version=${{ needs.check-version.outputs.new_version }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/auto-tag.yml

@@ -1,77 +0,0 @@
-name: Auto Tag on Version Change
-
-on:
-  push:
-    branches:
-      - main
-    paths:
-      - 'pubspec.yaml'
-
-jobs:
-  check-version:
-    runs-on: ubuntu-latest
-    permissions:
-      contents: write
-    
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-        with:
-          fetch-depth: 2  # Need previous commit to compare
-
-      - name: Get current version
-        id: current
-        run: |
-          VERSION=$(grep '^version:' pubspec.yaml | sed 's/version: //' | cut -d'+' -f1)
-          echo "version=$VERSION" >> $GITHUB_OUTPUT
-          echo "Current version: $VERSION"
-
-      - name: Get previous version
-        id: previous
-        run: |
-          git checkout HEAD~1 -- pubspec.yaml 2>/dev/null || echo "version: 0.0.0" > pubspec.yaml.old
-          if [ -f pubspec.yaml.old ]; then
-            VERSION=$(grep '^version:' pubspec.yaml.old | sed 's/version: //' | cut -d'+' -f1)
-          else
-            VERSION=$(grep '^version:' pubspec.yaml | sed 's/version: //' | cut -d'+' -f1)
-          fi
-          git checkout HEAD -- pubspec.yaml
-          echo "version=$VERSION" >> $GITHUB_OUTPUT
-          echo "Previous version: $VERSION"
-
-      - name: Check if version changed
-        id: check
-        run: |
-          CURRENT="${{ steps.current.outputs.version }}"
-          PREVIOUS="${{ steps.previous.outputs.version }}"
-          
-          if [ "$CURRENT" != "$PREVIOUS" ]; then
-            echo "Version changed from $PREVIOUS to $CURRENT"
-            echo "changed=true" >> $GITHUB_OUTPUT
-          else
-            echo "Version unchanged: $CURRENT"
-            echo "changed=false" >> $GITHUB_OUTPUT
-          fi
-
-      - name: Check if tag exists
-        id: tag_exists
-        if: steps.check.outputs.changed == 'true'
-        run: |
-          TAG="v${{ steps.current.outputs.version }}"
-          if git ls-remote --tags origin | grep -q "refs/tags/$TAG"; then
-            echo "Tag $TAG already exists"
-            echo "exists=true" >> $GITHUB_OUTPUT
-          else
-            echo "Tag $TAG does not exist"
-            echo "exists=false" >> $GITHUB_OUTPUT
-          fi
-
-      - name: Create and push tag
-        if: steps.check.outputs.changed == 'true' && steps.tag_exists.outputs.exists == 'false'
-        run: |
-          TAG="v${{ steps.current.outputs.version }}"
-          git config user.name "github-actions[bot]"
-          git config user.email "github-actions[bot]@users.noreply.github.com"
-          git tag -a "$TAG" -m "Release $TAG"
-          git push origin "$TAG"
-          echo "Created and pushed tag: $TAG"

.github/workflows/ios-build.yml

@@ -0,0 +1,118 @@
+name: iOS Build
+
+on:
+  push:
+    tags:
+      - 'v*'
+  workflow_dispatch:
+
+jobs:
+  build-ios:
+    runs-on: macos-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.21'
+          cache-dependency-path: go_backend/go.sum
+
+      - name: Install gomobile
+        run: |
+          go install golang.org/x/mobile/cmd/gomobile@latest
+          gomobile init
+
+      - name: Build Go backend for iOS (XCFramework)
+        working-directory: go_backend
+        run: |
+          mkdir -p ../ios/Frameworks
+          gomobile bind -target=ios -o ../ios/Frameworks/Gobackend.xcframework .
+        env:
+          CGO_ENABLED: 1
+
+      - name: Verify XCFramework created
+        run: |
+          echo "=== Checking XCFramework ==="
+          ls -la ios/Frameworks/
+          ls -la ios/Frameworks/Gobackend.xcframework/ || (echo "ERROR: XCFramework not found!" && exit 1)
+
+      - name: Add XCFramework to Xcode project
+        run: |
+          # Install xcodeproj gem for modifying Xcode project
+          sudo gem install xcodeproj
+          
+          # Create Ruby script to add framework
+          cat > add_framework.rb << 'EOF'
+          require 'xcodeproj'
+          
+          project_path = 'ios/Runner.xcodeproj'
+          project = Xcodeproj::Project.open(project_path)
+          
+          # Get the main target
+          target = project.targets.find { |t| t.name == 'Runner' }
+          
+          # Get or create Frameworks group
+          frameworks_group = project.main_group.find_subpath('Frameworks', true)
+          frameworks_group ||= project.main_group.new_group('Frameworks')
+          
+          # Add XCFramework reference
+          framework_path = 'Frameworks/Gobackend.xcframework'
+          framework_ref = frameworks_group.new_file(framework_path, :project)
+          
+          # Add to frameworks build phase
+          frameworks_build_phase = target.frameworks_build_phase
+          frameworks_build_phase.add_file_reference(framework_ref)
+          
+          # Add to embed frameworks build phase
+          embed_phase = target.build_phases.find { |p| p.is_a?(Xcodeproj::Project::Object::PBXCopyFilesBuildPhase) && p.name == 'Embed Frameworks' }
+          if embed_phase
+            build_file = embed_phase.add_file_reference(framework_ref)
+            build_file.settings = { 'ATTRIBUTES' => ['CodeSignOnCopy', 'RemoveHeadersOnCopy'] }
+          end
+          
+          project.save
+          puts "Successfully added Gobackend.xcframework to Xcode project"
+          EOF
+          
+          ruby add_framework.rb
+
+      - name: Setup Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          channel: 'stable'
+          cache: true
+
+      - name: Get Flutter dependencies
+        run: flutter pub get
+
+      - name: Generate app icons
+        run: dart run flutter_launcher_icons
+
+      - name: Build iOS (no codesign)
+        run: flutter build ios --release --no-codesign
+
+      - name: Create IPA (unsigned)
+        run: |
+          mkdir -p build/ios/ipa
+          cd build/ios/iphoneos
+          mkdir Payload
+          cp -r Runner.app Payload/
+          zip -r ../ipa/SpotiFLAC-unsigned.ipa Payload
+          rm -rf Payload
+
+      - name: Upload IPA artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: SpotiFLAC-iOS-unsigned
+          path: build/ios/ipa/SpotiFLAC-unsigned.ipa
+          retention-days: 30
+
+      - name: Upload XCFramework artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: Gobackend-XCFramework
+          path: ios/Frameworks/Gobackend.xcframework
+          retention-days: 30

.github/workflows/release.yml

@@ -3,13 +3,13 @@ name: Release
 on:
   push:
     tags:
-      - "v*"
+      - 'v*'
   workflow_dispatch:
     inputs:
       version:
-        description: "Version tag (e.g., v1.0.0)"
+        description: 'Version tag (e.g., v1.0.0)'
         required: true
-        default: "v1.0.0"
+        default: 'v1.0.0'
 
 jobs:
   # Get version first (quick job)
@@ -17,61 +17,35 @@ jobs:
     runs-on: ubuntu-latest
     outputs:
       version: ${{ steps.version.outputs.version }}
-      is_prerelease: ${{ steps.version.outputs.is_prerelease }}
     steps:
       - name: Get version
         id: version
         run: |
           if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
-            VERSION="${{ github.event.inputs.version }}"
+            echo "version=${{ github.event.inputs.version }}" >> $GITHUB_OUTPUT
           else
-            VERSION="${GITHUB_REF#refs/tags/}"
-          fi
-          echo "version=$VERSION" >> $GITHUB_OUTPUT
-
-          # Check if version contains -preview, -beta, -rc, or -alpha (NOT -hotfix)
-          VERSION_LOWER=$(echo "$VERSION" | tr '[:upper:]' '[:lower:]')
-          if [[ "$VERSION_LOWER" == *"-preview"* ]] || [[ "$VERSION_LOWER" == *"-beta"* ]] || [[ "$VERSION_LOWER" == *"-rc"* ]] || [[ "$VERSION_LOWER" == *"-alpha"* ]]; then
-            echo "is_prerelease=true" >> $GITHUB_OUTPUT
-            echo "Detected pre-release version: $VERSION"
-          else
-            echo "is_prerelease=false" >> $GITHUB_OUTPUT
-            echo "Detected stable version: $VERSION"
+            echo "version=${GITHUB_REF#refs/tags/}" >> $GITHUB_OUTPUT
           fi
 
   # Android and iOS build in PARALLEL
   build-android:
     runs-on: ubuntu-latest
     needs: get-version
-
+    
     steps:
-      - name: Free disk space
-        run: |
-          # Remove large unused tools (~15GB total)
-          sudo rm -rf /usr/share/dotnet
-          sudo rm -rf /opt/ghc
-          sudo rm -rf /opt/hostedtoolcache/CodeQL
-          sudo rm -rf /usr/local/share/boost
-          sudo rm -rf /usr/share/swift
-          sudo rm -rf /usr/local/.ghcup
-          # Clean docker images
-          sudo docker image prune --all --force
-          # Show available space
-          df -h
-
       - name: Checkout repository
         uses: actions/checkout@v4
 
       - name: Setup Java
         uses: actions/setup-java@v4
         with:
-          distribution: "temurin"
-          java-version: "17"
+          distribution: 'temurin'
+          java-version: '17'
 
       - name: Setup Go
         uses: actions/setup-go@v5
         with:
-          go-version: "1.25"
+          go-version: '1.21'
           cache-dependency-path: go_backend/go.sum
 
       # Cache Gradle for faster builds
@@ -85,20 +59,7 @@ jobs:
           restore-keys: gradle-${{ runner.os }}-
 
       - name: Install Android SDK & NDK
-        run: |
-          # Use pre-installed Android SDK on GitHub runners
-          echo "ANDROID_HOME=$ANDROID_HOME"
-          echo "ANDROID_SDK_ROOT=$ANDROID_SDK_ROOT"
-
-          # Accept licenses
-          yes | $ANDROID_HOME/cmdline-tools/latest/bin/sdkmanager --licenses || true
-
-          # Install NDK r27d LTS (required for 16KB page size support on Android 15+)
-          # Platform android-36 and build-tools 36.0.0 for targetSdk 36 (Android 16)
-          $ANDROID_HOME/cmdline-tools/latest/bin/sdkmanager "ndk;27.3.13750724" "platforms;android-36" "build-tools;36.0.0"
-
-          # Set NDK path
-          echo "ANDROID_NDK_HOME=$ANDROID_HOME/ndk/27.3.13750724" >> $GITHUB_ENV
+        uses: android-actions/setup-android@v3
 
       - name: Install gomobile
         run: |
@@ -116,7 +77,7 @@ jobs:
       - name: Setup Flutter
         uses: subosito/flutter-action@v2
         with:
-          channel: "stable"
+          channel: 'stable'
           cache: true
 
       - name: Get Flutter dependencies
@@ -125,36 +86,16 @@ jobs:
       - name: Generate app icons
         run: dart run flutter_launcher_icons
 
-      - name: Build APK (Release - unsigned)
-        run: |
-          flutter build apk --release --split-per-abi || true
-          # Verify APKs were created
-          ls -la build/app/outputs/flutter-apk/
-          if [ ! -f "build/app/outputs/flutter-apk/app-arm64-v8a-release.apk" ]; then
-            echo "ERROR: APK not found!"
-            exit 1
-          fi
-
-      - name: Sign APKs
-        uses: r0adkll/sign-android-release@v1
-        id: sign_arm64
-        with:
-          releaseDirectory: build/app/outputs/flutter-apk
-          signingKeyBase64: ${{ secrets.KEYSTORE_BASE64 }}
-          alias: ${{ secrets.KEY_ALIAS }}
-          keyStorePassword: ${{ secrets.KEYSTORE_PASSWORD }}
-          keyPassword: ${{ secrets.KEY_PASSWORD }}
-        env:
-          BUILD_TOOLS_VERSION: "36.0.0"
+      - name: Build APK (Release)
+        run: flutter build apk --release --split-per-abi
 
       - name: Rename APKs
         run: |
           VERSION=${{ needs.get-version.outputs.version }}
           cd build/app/outputs/flutter-apk
-          # Signed files have -signed suffix
-          mv app-arm64-v8a-release-signed.apk SpotiFLAC-${VERSION}-arm64.apk || mv app-arm64-v8a-release.apk SpotiFLAC-${VERSION}-arm64.apk || true
-          mv app-armeabi-v7a-release-signed.apk SpotiFLAC-${VERSION}-arm32.apk || mv app-armeabi-v7a-release.apk SpotiFLAC-${VERSION}-arm32.apk || true
-          mv app-release-signed.apk SpotiFLAC-${VERSION}-universal.apk || mv app-release.apk SpotiFLAC-${VERSION}-universal.apk || true
+          mv app-arm64-v8a-release.apk SpotiFLAC-${VERSION}-arm64.apk || true
+          mv app-armeabi-v7a-release.apk SpotiFLAC-${VERSION}-arm32.apk || true
+          mv app-release.apk SpotiFLAC-${VERSION}-universal.apk || true
           ls -la
 
       - name: Upload APK artifact
@@ -165,8 +106,8 @@ jobs:
 
   build-ios:
     runs-on: macos-latest
-    needs: get-version # Only depends on version, NOT android build!
-
+    needs: get-version  # Only depends on version, NOT android build!
+    
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
@@ -174,7 +115,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v5
         with:
-          go-version: "1.25"
+          go-version: '1.21'
           cache-dependency-path: go_backend/go.sum
 
       # Cache CocoaPods
@@ -194,7 +135,7 @@ jobs:
         working-directory: go_backend
         run: |
           mkdir -p ../ios/Frameworks
-          gomobile bind -target=ios -tags ios -o ../ios/Frameworks/Gobackend.xcframework .
+          gomobile bind -target=ios -o ../ios/Frameworks/Gobackend.xcframework .
         env:
           CGO_ENABLED: 1
 
@@ -202,51 +143,51 @@ jobs:
         run: |
           ls -la ios/Frameworks/
           ls -la ios/Frameworks/Gobackend.xcframework/ || (echo "ERROR: XCFramework not found!" && exit 1)
-
+          
       - name: Add XCFramework to Xcode project
         run: |
           # Install xcodeproj gem for modifying Xcode project
           sudo gem install xcodeproj
-
+          
           # Create Ruby script to add framework
           cat > add_framework.rb << 'EOF'
           require 'xcodeproj'
-
+          
           project_path = 'ios/Runner.xcodeproj'
           project = Xcodeproj::Project.open(project_path)
-
+          
           # Get the main target
           target = project.targets.find { |t| t.name == 'Runner' }
-
+          
           # Get or create Frameworks group
           frameworks_group = project.main_group.find_subpath('Frameworks', true)
           frameworks_group ||= project.main_group.new_group('Frameworks')
-
+          
           # Add XCFramework reference
           framework_path = 'Frameworks/Gobackend.xcframework'
           framework_ref = frameworks_group.new_file(framework_path, :project)
-
+          
           # Add to frameworks build phase
           frameworks_build_phase = target.frameworks_build_phase
           frameworks_build_phase.add_file_reference(framework_ref)
-
+          
           # Add to embed frameworks build phase
           embed_phase = target.build_phases.find { |p| p.is_a?(Xcodeproj::Project::Object::PBXCopyFilesBuildPhase) && p.name == 'Embed Frameworks' }
           if embed_phase
             build_file = embed_phase.add_file_reference(framework_ref)
             build_file.settings = { 'ATTRIBUTES' => ['CodeSignOnCopy', 'RemoveHeadersOnCopy'] }
           end
-
+          
           project.save
           puts "Successfully added Gobackend.xcframework to Xcode project"
           EOF
-
+          
           ruby add_framework.rb
 
       - name: Setup Flutter
         uses: subosito/flutter-action@v2
         with:
-          channel: "stable"
+          channel: 'stable'
           cache: true
 
       - name: Get Flutter dependencies
@@ -256,44 +197,18 @@ jobs:
         run: dart run flutter_launcher_icons
 
       - name: Build iOS (unsigned)
-        run: |
-          # Build Flutter iOS without codesigning
-          flutter build ios --release --no-codesign --config-only
-
-          # Use xcodebuild with code signing disabled
-          cd ios
-          xcodebuild -workspace Runner.xcworkspace \
-            -scheme Runner \
-            -configuration Release \
-            -sdk iphoneos \
-            -destination 'generic/platform=iOS' \
-            -archivePath build/Runner.xcarchive \
-            archive \
-            CODE_SIGNING_ALLOWED=NO \
-            CODE_SIGNING_REQUIRED=NO \
-            CODE_SIGN_IDENTITY="" \
-            DEVELOPMENT_TEAM=""
+        run: flutter build ios --release --no-codesign
 
       - name: Create IPA
         run: |
           VERSION=${{ needs.get-version.outputs.version }}
           mkdir -p build/ios/ipa
-          cd ios/build/Runner.xcarchive/Products/Applications
+          cd build/ios/iphoneos
           mkdir Payload
           cp -r Runner.app Payload/
-          # Use absolute path to avoid relative path issues
-          zip -r $GITHUB_WORKSPACE/build/ios/ipa/SpotiFLAC-${VERSION}-ios-unsigned.ipa Payload
+          zip -r ../ipa/SpotiFLAC-${VERSION}-ios-unsigned.ipa Payload
           rm -rf Payload
 
-      - name: Verify IPA created
-        run: |
-          ls -la build/ios/ipa/
-          VERSION=${{ needs.get-version.outputs.version }}
-          if [ ! -f "build/ios/ipa/SpotiFLAC-${VERSION}-ios-unsigned.ipa" ]; then
-            echo "ERROR: IPA not created!"
-            exit 1
-          fi
-
       - name: Upload IPA artifact
         uses: actions/upload-artifact@v4
         with:
@@ -305,7 +220,7 @@ jobs:
     needs: [get-version, build-android, build-ios]
     permissions:
       contents: write
-
+    
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
@@ -315,23 +230,23 @@ jobs:
         run: |
           VERSION=${{ needs.get-version.outputs.version }}
           VERSION_NUM=${VERSION#v}  # Remove 'v' prefix
-
-          echo "Looking for version: $VERSION_NUM"
-
-          # Extract changelog section for this version using sed
-          # Find the line with version, then print until next version header or end
-          CHANGELOG=$(sed -n "/^## \[$VERSION_NUM\]/,/^## \[/{ /^## \[$VERSION_NUM\]/d; /^## \[/d; p; }" CHANGELOG.md)
-
+          
+          # Extract changelog section for this version
+          # Look for ## [X.X.X] and capture until next ## [ or end of file
+          CHANGELOG=$(awk -v ver="$VERSION_NUM" '
+            /^## \[/ {
+              if (found) exit
+              if ($0 ~ "\\[" ver "\\]") found=1
+              next
+            }
+            found { print }
+          ' CHANGELOG.md)
+          
           # If no changelog found, use default message
           if [ -z "$CHANGELOG" ]; then
-            echo "No changelog found for version $VERSION_NUM"
             CHANGELOG="See CHANGELOG.md for details."
-          else
-            echo "Found changelog content"
-            # Remove trailing --- separator if present (CHANGELOG uses --- between versions)
-            CHANGELOG=$(echo "$CHANGELOG" | sed '/^---$/d')
           fi
-
+          
           # Save to file for multiline support
           echo "$CHANGELOG" > /tmp/changelog.txt
           echo "Extracted changelog:"
@@ -353,34 +268,32 @@ jobs:
         run: |
           VERSION=${{ needs.get-version.outputs.version }}
           cat > /tmp/release_body.txt << 'HEADER'
+          ## SpotiFLAC $VERSION
+          
+          Download Spotify tracks in FLAC quality from Tidal, Qobuz & Amazon Music.
+          
           ### What's New
           HEADER
-
+          
+          # Replace $VERSION in header
+          sed -i "s/\$VERSION/$VERSION/g" /tmp/release_body.txt
+          
           cat /tmp/changelog.txt >> /tmp/release_body.txt
-
-          REPO_OWNER="${{ github.repository_owner }}"
-          REPO_NAME="${{ github.event.repository.name }}"
           
           cat >> /tmp/release_body.txt << FOOTER
-
+          
           ---
-
+          
           ### Downloads
-
-          #### Android
-          - **arm64**: \`SpotiFLAC-${VERSION}-arm64.apk\` (recommended for modern devices)
-          - **arm32**: \`SpotiFLAC-${VERSION}-arm32.apk\` (older devices)
-
-          #### iOS
+          - **Android (arm64)**: \`SpotiFLAC-${VERSION}-arm64.apk\` (recommended)
+          - **Android (arm32)**: \`SpotiFLAC-${VERSION}-arm32.apk\` (older devices)
           - **iOS**: \`SpotiFLAC-${VERSION}-ios-unsigned.ipa\` (sideload required)
-
+          
           ### Installation
           **Android**: Enable "Install from unknown sources" and install the APK
           **iOS**: Use AltStore, Sideloadly, or similar tools to sideload the IPA
-
-          ![arm64](https://img.shields.io/github/downloads/${REPO_OWNER}/${REPO_NAME}/${VERSION}/SpotiFLAC-${VERSION}-arm64.apk?style=flat-square&logo=android&label=arm64&color=3DDC84) ![arm32](https://img.shields.io/github/downloads/${REPO_OWNER}/${REPO_NAME}/${VERSION}/SpotiFLAC-${VERSION}-arm32.apk?style=flat-square&logo=android&label=arm32&color=3DDC84) ![iOS](https://img.shields.io/github/downloads/${REPO_OWNER}/${REPO_NAME}/${VERSION}/SpotiFLAC-${VERSION}-ios-unsigned.ipa?style=flat-square&logo=apple&label=iOS&color=0078D6)
           FOOTER
-
+          
           echo "Release body:"
           cat /tmp/release_body.txt
 
@@ -392,138 +305,6 @@ jobs:
           body_path: /tmp/release_body.txt
           files: ./release/*
           draft: false
-          prerelease: ${{ needs.get-version.outputs.is_prerelease == 'true' }}
+          prerelease: false
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-
-  notify-telegram:
-    runs-on: ubuntu-latest
-    needs: [get-version, create-release]
-    if: ${{ needs.get-version.outputs.is_prerelease != 'true' }}
-
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
-      - name: Download Android APK
-        uses: actions/download-artifact@v4
-        with:
-          name: android-apk
-          path: ./release
-
-      - name: Download iOS IPA
-        uses: actions/download-artifact@v4
-        with:
-          name: ios-ipa
-          path: ./release
-
-      - name: Extract changelog for version
-        id: changelog
-        run: |
-          VERSION=${{ needs.get-version.outputs.version }}
-          VERSION_NUM=${VERSION#v}
-
-          # Extract changelog, limit to ~2500 chars for Telegram (4096 limit minus message overhead)
-          # Use tr -d '\r' to handle CRLF line endings from Windows
-          FULL_CHANGELOG=$(cat CHANGELOG.md | tr -d '\r' | sed -n "/^## \[$VERSION_NUM\]/,/^## \[/{ /^## \[$VERSION_NUM\]/d; /^## \[/d; p; }" | sed '/^---$/d')
-          
-          echo "DEBUG: Extracted changelog length: ${#FULL_CHANGELOG}"
-          echo "DEBUG: First 200 chars: ${FULL_CHANGELOG:0:200}"
-          
-          if [ -z "$FULL_CHANGELOG" ]; then
-            CHANGELOG="See release notes on GitHub for details."
-          else
-            # Convert GitHub Markdown to Telegram HTML:
-            # - **text** → <b>text</b>
-            # - `code` → <code>code</code>
-            # - ### Header → <b>Header</b>
-            # - Escape HTML special chars first
-            # - Remove > blockquote prefix
-            CHANGELOG=$(echo "$FULL_CHANGELOG" | \
-              sed 's/^> //' | \
-              sed 's/&/\&amp;/g' | \
-              sed 's/</\&lt;/g' | \
-              sed 's/>/\&gt;/g' | \
-              sed 's/`\([^`]*\)`/<code>\1<\/code>/g' | \
-              sed 's/\*\*\([^*]*\)\*\*/<b>\1<\/b>/g' | \
-              sed 's/^### \(.*\)$/<b>\1<\/b>/g' | \
-              sed 's/^## \(.*\)$/<b>\1<\/b>/g' | \
-              sed 's/^- /• /g' | \
-              sed 's/^  - /  ◦ /g')
-            
-            # Take first 2500 characters, then cut at last complete line
-            CHANGELOG=$(echo "$CHANGELOG" | head -c 2500 | sed '$d')
-            
-            # Check if truncated
-            FULL_LEN=${#FULL_CHANGELOG}
-            if [ $FULL_LEN -gt 2500 ]; then
-              CHANGELOG="${CHANGELOG}"$'\n\n... (see full changelog on GitHub)'
-            fi
-          fi
-
-          echo "$CHANGELOG" > /tmp/changelog.txt
-          echo "DEBUG: Final changelog:"
-          cat /tmp/changelog.txt
-
-      - name: Send to Telegram Channel
-        env:
-          TELEGRAM_BOT_TOKEN: ${{ secrets.TELEGRAM_BOT_TOKEN }}
-          TELEGRAM_CHANNEL_ID: ${{ secrets.TELEGRAM_CHANNEL_ID }}
-        run: |
-          VERSION=${{ needs.get-version.outputs.version }}
-          CHANGELOG=$(cat /tmp/changelog.txt)
-          
-          # Find APK files
-          ARM64_APK=$(find ./release -name "*arm64*.apk" | head -1)
-          ARM32_APK=$(find ./release -name "*arm32*.apk" | head -1)
-          
-          # Prepare message with changelog (HTML format)
-          printf '%s\n' \
-            "<b>SpotiFLAC Mobile ${VERSION} Released!</b>" \
-            "" \
-            "<b>What's New:</b>" \
-            "${CHANGELOG}" \
-            "" \
-            "<a href=\"https://github.com/${{ github.repository }}/releases/tag/${VERSION}\">View Release Notes</a>" \
-            > /tmp/telegram_message.txt
-
-          MESSAGE=$(cat /tmp/telegram_message.txt)
-
-          # Send message first (using HTML parse mode)
-          # Use --data-urlencode for proper encoding of special chars (+, &, etc.)
-          # Use || true to ensure file uploads continue even if message fails
-          curl -s -X POST "https://api.telegram.org/bot${TELEGRAM_BOT_TOKEN}/sendMessage" \
-            --data-urlencode "chat_id=${TELEGRAM_CHANNEL_ID}" \
-            --data-urlencode "text=${MESSAGE}" \
-            --data-urlencode "parse_mode=HTML" \
-            --data-urlencode "disable_web_page_preview=true" || true
-
-          # Upload arm64 APK to channel
-          if [ -f "$ARM64_APK" ]; then
-            echo "Uploading arm64 APK to Telegram..."
-            curl -s -X POST "https://api.telegram.org/bot${TELEGRAM_BOT_TOKEN}/sendDocument" \
-              -F chat_id="${TELEGRAM_CHANNEL_ID}" \
-              -F document=@"${ARM64_APK}" \
-              -F caption="SpotiFLAC ${VERSION} - arm64 (recommended)"
-          fi
-
-          # Upload arm32 APK to channel
-          if [ -f "$ARM32_APK" ]; then
-            echo "Uploading arm32 APK to Telegram..."
-            curl -s -X POST "https://api.telegram.org/bot${TELEGRAM_BOT_TOKEN}/sendDocument" \
-              -F chat_id="${TELEGRAM_CHANNEL_ID}" \
-              -F document=@"${ARM32_APK}" \
-              -F caption="SpotiFLAC ${VERSION} - arm32"
-          fi
-
-          # Upload iOS IPA to channel
-          IOS_IPA=$(find ./release -name "*ios*.ipa" | head -1)
-          if [ -f "$IOS_IPA" ]; then
-            echo "Uploading iOS IPA to Telegram..."
-            curl -s -X POST "https://api.telegram.org/bot${TELEGRAM_BOT_TOKEN}/sendDocument" \
-              -F chat_id="${TELEGRAM_CHANNEL_ID}" \
-              -F document=@"${IOS_IPA}" \
-              -F caption="SpotiFLAC ${VERSION} - iOS (unsigned, sideload required)"
-          fi
-
-          echo "Telegram notification sent!"

.gitignore

@@ -6,70 +6,9 @@ Thumbs.db
 .idea/
 .vscode/
 *.iml
-.cursorignore
-.cursorrules
 
-# Kiro specs (development only)
-.kiro/
+# Kiro specs (optional - remove if you want to track specs)
+# .kiro/
 
-# Reference folder (development only)
-referensi/
-
-# Documentation (development only, published separately)
-docs/
-
-# Old spotiflac_android folder (moved to root)
-spotiflac_android/
-
-# Flutter/Dart
-.dart_tool/
-.packages
-build/
-*.lock
-!pubspec.lock
-.flutter-plugins
-.flutter-plugins-dependencies
-.metadata
-*.apk
-
-# Go backend build artifacts
-go_backend/*.aar
-go_backend/*.jar
-go_backend/*.exe
-go_backend/*.xcframework/
-
-# Android
-android/.gradle/
-android/app/libs/gobackend.aar
-android/local.properties
-android/*.iml
-android/key.properties
-android/*.jks
-android/*.keystore
-android/app/*.jks
-
-# iOS
-ios/Frameworks/
-ios/Pods/
-ios/.symlinks/
-ios/Flutter/Flutter.framework/
-ios/Flutter/Flutter.podspec
-android/app/libs/gobackend-sources.jar
-
-# Extension folder
-extension/
-
-# Agent instructions
-AGENTS.md
-
-# Temp/misc
-nul
-
-# Log files
-*.log
-hs_err_*.log
-flutter_*.log
-
-# Development tools
-tool/
-.claude/settings.local.json
+# Reference folder (if you don't want to include it)
+# referensi/

CHANGELOG.md

@@ -1,602 +1,38 @@
 # Changelog
 
-## [3.5.0] - 2026-02-07
-
-### Highlights
-
-- **SAF Storage (Android 10+)**: Proper Storage Access Framework support for download destination (content URIs)
-  - Select download folder via SAF tree picker
-  - Downloads now write to SAF file descriptors (`/proc/self/fd/*`) instead of raw filesystem paths
-  - Works around Android 10+ scoped storage permission errors
-- **Modern Onboarding Experience**: Completely redesigned Setup and Tutorial screens
+## [1.1.0] - 2026-01-01
 
 ### Added
+- **Parallel Downloads**: Download up to 3 tracks simultaneously (configurable in Settings)
+  - Default: Sequential (1 at a time) for stability
+  - Options: 1, 2, or 3 concurrent downloads
+  - Warning about potential rate limiting from streaming services
+- **Download Progress Tracking**: Real-time progress for BTS manifest downloads from Tidal
+- **History Persistence**: Download history now persists across app restarts using SharedPreferences
+- **Connection Pooling**: Shared HTTP transport to prevent TCP connection exhaustion during large batch downloads
+- **Connection Cleanup**: Automatic cleanup of idle connections every 50 downloads and at queue end
+- **GitHub & Credits Section**: Added links to SpotiFLAC Mobile and original SpotiFLAC desktop in Settings
 
-- Home feed disk caching via SharedPreferences for instant restore on app startup
-- SAF display path resolver in native Android layer (converts tree URIs to readable paths)
-- New settings fields for storage mode + SAF tree URI
-- SAF platform bridge methods: pick tree, stat/exists/delete, open content URI, copy to temp, write back to SAF
-- SAF library scan mode (DocumentFile traversal + metadata read)
-- Incremental library scanning for filesystem and SAF paths (only scans new/modified files and detects removed files)
-- Force Full Scan action in Library Settings to rescan all files on demand
-- Downloaded files are now excluded from Local Library scan results to prevent duplicate entries
-- Legacy library rows now support `file_mod_time` backfill before incremental scans (faster follow-up scans after upgrade)
-- Library UI toggle to show SAF-repaired history items
-- Scan cancelled banner + retry action for library scans
-- Android DocumentFile dependency for SAF operations
-- Post-processing API v2 (SAF-aware, ready to replace v1)
-- Donate page in Settings with Ko-fi and Buy Me a Coffee links
-- Per-App Language support on Android 13+ (locale_config.xml)
-- Interactive tutorial with working search bar simulation and clickable download buttons
-- Tutorial completion state is persisted after onboarding
-- Visual feedback animations for page transitions, entrance effects, and feature lists
-- New dedicated welcome step in setup wizard with improved branding
+### Fixed
+- **Download Progress Bug**: Fixed 0% → 100% jump by adding proper progress tracking for BTS format downloads
+- **TCP Connection Exhaustion**: Fixed slow downloads after ~300 tracks by implementing connection pooling and periodic cleanup
+- **Trailing Space in Names**: Fixed download failures when playlist/album/track names have trailing spaces
+- **History Loss on Debug**: History no longer disappears when sideloading via `flutter run --debug`
 
 ### Changed
-
-- Download pipeline supports `output_path` + `output_ext` for Go backend
-- Tidal/Qobuz/Amazon/Extension downloads use SAF-aware output when enabled
-- Post-processing hooks run for SAF content URIs (via temp file bridge)
-- File operations in Library/Queue/Track screens now SAF-aware (`open`, `exists`, `delete`, `stat`)
-- Local Library scan defaults to incremental mode; full rescan is available via Force Full Scan
-- Local library database upgraded to schema v3 with `file_mod_time` tracking for incremental scan cache
-- Platform channels expanded with incremental scan APIs (`scanLibraryFolderIncremental`) on Android and iOS
-- Android platform channel adds `getSafFileModTimes` for SAF legacy cache backfill
-- Android build tooling upgraded to Gradle 9.3.1 (wrapper)
-- Android build path validated with Java 25 (Gradle/Kotlin/assemble debug)
-- SAF tree picker flow in `MainActivity` migrated to Activity Result API (`registerForActivityResult`)
-- `MainActivity` host migrated to `FlutterFragmentActivity` for SAF picker compatibility
-- Legacy `startActivityForResult` / `onActivityResult` SAF picker path removed
-- Setup screen UI polish: smaller logo, thin outline borders on text fields
-- Removed support section from About page (moved to Donate page)
-- Qobuz squid.wtf region fallback for blocked regions
-- Setup screen converted to PageView flow with animated progress bar and modern card layouts
-- Tutorial screen aligned with Setup Screen design, updated typography and softened UI shapes
-- Larger, more accessible navigation buttons for onboarding flow
-- Reduced visual noise by removing unnecessary glow effects
-
-### Fixed
-
-- Android 10+ `permission denied` when writing to `/storage/emulated/0` (now handled via SAF)
-- SAF history repair: auto-resolve missing content URIs using tree + filename
-- SAF download fallback: retry in app-private storage when SAF write fails
-- Tidal DASH manifest writing when output path is a file descriptor (no invalid `.m4a` path)
-- External LRC output in SAF mode
-- Restored old-device renderer fallback while using `FlutterFragmentActivity` by injecting shell args from a custom `FlutterFragment` (`--enable-impeller=false` on problematic devices)
-- Preserved Flutter fragment creation behavior (cached engine, engine group, new engine) while adding Impeller fallback support
-- SAF tree picker result now consistently returns `tree_uri` payload with persisted URI permission handling
-- SAF share file now copies to temp before sharing (fixes share from SAF content URI)
-- Home feed not updating after installing extension with homeFeed capability (no longer requires app restart)
-- Library scan hero card showing 0 tracks during scan (now shows scanned file count in real-time)
-- Library folder picker no longer requires MANAGE_EXTERNAL_STORAGE on Android 10+ (uses SAF tree picker)
-- One-time SAF migration prompt for users updating from pre-SAF versions
-- Fixed `fileModTime` propagation across Go/Android/Dart so incremental scan cache is stored and reused correctly
-- Fixed SAF incremental scan key mismatch (`lastModified` vs `fileModTime`) and normalized result fields (`skippedCount`, `totalFiles`)
-- Fixed incremental scan progress when all files are skipped (`scanned_files` now reaches total files)
-- Removed duplicate `"removeExtension"` branch in Android method channel handler (eliminates Kotlin duplicate-branch warning)
-
----
-
-## [3.4.2] - 2026-02-04
-
-### Improved
-
-- **Mobile Network Reliability**: All providers (Qobuz, Tidal, Amazon, Deezer) now have retry logic with exponential backoff
-  - Increased API timeouts: 15s → 25s (Deezer, Qobuz, Tidal), 30s (Amazon)
-  - Up to 3 retry attempts per API call (500ms → 1s → 2s backoff)
-  - Retryable: timeout, connection reset/refused, EOF, HTTP 5xx, HTTP 429
-- **SongLink ID Extraction**: Extract QobuzID/TidalID directly from SongLink URLs
-  - New fields in `TrackAvailability`: `QobuzID`, `TidalID`
-  - Qobuz/Tidal now use direct Track ID from SongLink instead of re-parsing URLs
-- **Qobuz Download Flow**: New Strategy 3 - get QobuzID from SongLink before ISRC search
-  - Cache hit now uses `GetTrackByID()` directly instead of searching again
-  - Pre-warm cache tries SongLink first before direct ISRC search
-- **Tidal Download Flow**: Use `availability.TidalID` directly from SongLink struct
-
----
-
-## [3.4.1] - 2026-02-04
-
-### Fixed
-
-- Metadata Priority order now persists after app restart
-- Download Provider Priority order now persists after app restart
-
----
-
-## [3.4.0] - 2026-02-03
-
-### Highlights
-
-- **Local Library Scanning** ([#117](https://github.com/zarzet/SpotiFLAC-Mobile/issues/117)): Scan existing music collection to detect duplicates (FLAC, M4A, MP3, Opus, OGG)
-- **Duplicate Detection** ([#117](https://github.com/zarzet/SpotiFLAC-Mobile/issues/117)): "In Library" badge on tracks matching by ISRC or track name + artist
-- **Unified Library Tab**: History renamed to Library, shows Downloaded + Local Library tracks with source badges
-
-### Added
-
-- Local Album Screen with cover art, disc grouping, and selection mode
-- Albums tab shows local library albums with folder icon badge
-- Singles filter includes local library singles
-- Advanced library filters: Source, Quality, Format, Date
-- Cover art extraction from embedded tags (FLAC, MP3, Opus/Ogg)
-- "Already in Library" notification when downloading existing tracks
-- Spotify secrets now stored in secure storage (`flutter_secure_storage`)
-- **Multi-Service Link Support**: Share links from Deezer, Tidal, and YouTube Music (in addition to Spotify)
-  - Deezer: Full support for track, album, playlist, artist links
-  - Tidal: Track links converted via SongLink to Spotify/Deezer for metadata
-  - YouTube Music: Handled via ytmusic extension URL handler
-- Local library tracks now open metadata screen on tap
-
-### Changed
-
-- Extension HTTP sandbox enforces HTTPS and blocks private IPs
-- Extension file sandbox validates paths with boundary-safe checks
-
-### Fixed
-
-- Search filter bar now only appears after results load, not during loading
-- MP3/Ogg metadata parsing (ID3v2 extended headers, Ogg packet reassembly)
-- Library scan metadata (ISRC, disc number, release date)
-- Cover cache robustness (size + mtime cache key)
-- Local library selection and delete in list/grid views
-- Albums/Singles count includes local library items
-
----
-
-## [3.3.6] - 2026-02-02
-
-### Added
-
-- **WiFi-Only Download Mode**: Pause downloads on mobile data, auto-resume on WiFi (Settings > Download > Download Network)
-- Added `connectivity_plus: ^6.0.3` dependency
-
----
-
-## [3.3.5] - 2026-02-01
-
-Same as 3.3.1 but fixes crash issues caused by FFmpeg.
-
-### Added
-
-- **Export Failed Downloads**: Export failed downloads to TXT file for easy lookup on other platforms
-- **Auto-Export Setting**: Option to automatically export failed downloads when queue finishes
-
-### Fixed
-
-- **FFmpeg Crash**: Fixed crash issues during M4A to MP3/Opus conversion
-- **Service Selection Ignored**: Fixed bug where selecting Qobuz/Amazon from service picker was ignored and always used Tidal instead
-- **iOS iCloud Drive Permission Error**: Block iCloud Drive folder selection on iOS (Go backend cannot access iCloud due to sandboxing)
-
-### Changed
-
-- **Amazon Fallback Only**: Amazon Music is now grayed out in service picker and can only be used as fallback provider
-
----
-
-## [3.3.1] - 2026-02-01
-
-### Added
-
-- **Clear All Queue Button**: Cancel all queued downloads with one tap ([#96](https://github.com/zarzet/SpotiFLAC-Mobile/issues/96))
-- **IDHS Fallback**: Fallback link resolver when SongLink fails (rate limited 8 req/min)
-- **Lossy Bitrate Options**: MP3 (320/256/192/128kbps), Opus (128/96/64kbps)
-- **Search Filters**: Filter results by type (Tracks, Artists, Albums, Playlists)
-- **Album/Playlist Search**: Deezer search now includes albums and playlists
-- **New Languages**: Turkish (Kaan, BedirhanGltkn), Japanese (Re\*Index.(ot_inc))
-- **Optional All Files Access**: Android 13+ no longer requires full storage access; enable in Settings if needed
-- **Improved VPN Compatibility**: Better HTTP/2 support for users behind VPN or restricted networks
-
-### Changed
-
-- **Amazon Download API**: Switched to AfkarXYZ API
-- **Qobuz Download API**: Added Jumo API as fallback
-- **Search Results**: Reduced artist limit from 5 to 2
-
-### Fixed
-
-- **MP3 Download Error 403**: Fixed 403 Forbidden error when downloading MP3 files ([#108](https://github.com/zarzet/SpotiFLAC-Mobile/issues/108))
-- **Opus Cover Art**: Implemented METADATA_BLOCK_PICTURE for proper cover embedding
-- **Deezer Pagination**: Fixed >25 tracks only showing first 25 ([#112](https://github.com/zarzet/SpotiFLAC-Mobile/issues/112))
-- **Duplicate Embed Lyrics Setting**: Removed from Options page ([#110](https://github.com/zarzet/SpotiFLAC-Mobile/issues/110))
-
----
-
-## [3.2.1] - 2026-01-22
-
-### Added
-
-- **Artist/Album + Singles Folder Structure**: Singles go inside artist folder (`Artist/Album/`, `Artist/Singles/`)
-- **Embed Lyrics Button**: Manually embed online lyrics into tracks from Track Info screen (preserves synced timestamps)
-- **Pause/Resume Button**: Added pause and resume controls next to "Downloading" header in History screen
-- **Instrumental Detection**: Tracks marked as instrumental on lrclib.net now show "Instrumental track" instead of "Lyrics not available"
-
-### Fixed
-
-- **Lyrics**: Multi-artist tracks now search by primary artist first, then full string
-- **Lyrics**: Metadata tags (`[ti:...]`, `[ar:...]`, `[by:...]`) no longer shown in display
-- **Lyrics**: Embed button now correctly appears for tracks with online lyrics
-- **Lyrics**: Manual embed preserves original timestamps instead of plain text
-- **iOS**: Fixed "File not found" after 3.1.x → 3.2.0 update (container UUID migration)
-- **Home Feed**: Greeting now uses device local time
-- **Deezer**: Track position fallback to index+1 when API returns 0
-- **Localization**: Fixed 16 ICU plural syntax warnings in Spanish & Portuguese
-
-### Performance
-
-- **Home Feed**: Precomputed Quick Picks section flag and reduced per-page allocations; explore state now watched by field to cut rebuilds
-- **Home Recent**: Cached recent-access aggregation and limited list allocations for recent downloads
-- **Settings/Theme/Recent**: Cached SharedPreferences instance to avoid repeated `getInstance()` calls
-- **History/DB**: Batched iOS path migration updates to reduce write overhead
-- **Download Queue**: Reduced polling allocations and avoided double-load scheduling for history
-- **Misc**: Precompiled regex in share intent, update dialog, extensions error parsing, log analysis, and LRC cleanup; faster palette cache hits and log filtering
-
----
-
-## [3.2.0] - 2026-01-22
-
-> **Note:** Starting from v3.2.0, changelogs will be concise.
-
-### Highlights
-
-- **Discography Download** (Highly Requested): Download entire artist discography with album selection mode
-- **Home Feed / Explore**: Personalized sections from spotify-web and ytmusic extensions
-- **SQLite History Database**: O(1) lookups, non-blocking writes
-
-### Added
-
-- Discography download with options: All, Albums Only, Singles Only, or Select Albums
-- Artist navigation from album screen (tap artist name)
-- Home feed sections with pull-to-refresh
-- YT Music Quick Picks swipeable UI
-- `gobackend.getLocalTime()` API for extensions
-- Track duration in home feed items
-- Release date badge in album info card
-
-### Improved
-
-- Album track list shows track number instead of cover image
-- Download buttons with more rounded corners
-- Downloaded songs in Recent show primary-colored subtitle
-
-### Fixed
-
-- Home feed timezone detection
-- Track duration 0:00 when downloading from home feed
-
-### Extensions
-
-- spotify-web v1.8.1: Home feed, artist_id support
-- ytmusic v1.6.1: Home feed, artist_id support
-
----
-
-## [3.1.3] - 2026-01-19
-
-### Added
-
-- **External LRC Lyrics File Support**: Option to save lyrics as separate .lrc files for compatibility with external music players
-  - New "Lyrics Mode" setting in Settings > Download > Lyrics section
-  - Three modes available:
-    - **Embed in file** (default): Lyrics stored inside FLAC metadata
-    - **External .lrc file**: Save lyrics as separate .lrc file next to audio file
-    - **Both**: Embed and save external .lrc file
-  - Perfect for players like Samsung Music that prefer external .lrc files
-  - LRC files include metadata headers (title, artist, by:SpotiFLAC-Mobile)
-  - Works with all download services (Tidal, Qobuz, Amazon)
-- **CSV Import Quality Selection**: Choose audio quality when importing CSV playlists
-  - Quality picker now appears before adding CSV tracks to download queue
-  - Select between FLAC qualities (Lossless, Hi-Res, Hi-Res Max) or MP3
-  - Respects "Ask quality before download" setting - uses default quality if disabled
-  - **Persistent Cover Image Cache**: Album/track cover images now cached to persistent storage instead of temporary directory
-  - Cover images no longer disappear when app is closed or device restarts
-  - Cache stored in `app_flutter/cover_cache/` directory (not cleared by system)
-  - Maximum 1000 images cached for up to 365 days
-  - Covers are cached when displayed in History, Home, Album, Artist, or any other screen
-  - New `CoverCacheManager` service with `clearCache()` and `getStats()` methods for future cache management
-- **Extended Metadata from Deezer Enrichment**: Track downloads now include label, copyright, and genre metadata from Deezer
-  - New fields in `ExtTrackMetadata`: `label`, `copyright`, `genre`
-  - Metadata fetched during `enrichTrack()` via Deezer album API
-  - Embedded as FLAC Vorbis comments: `GENRE`, `ORGANIZATION` (label), `COPYRIGHT`
-  - Works for both extension downloads and built-in provider downloads (Tidal, Qobuz, Amazon)
-- **Track Metadata Screen Extended Info**: Genre, label, and copyright now displayed in track metadata screen
-  - Added `genre`, `label`, `copyright` fields to `DownloadHistoryItem` model
-  - Metadata is stored in download history and persists across app restarts
-  - New localization strings: `trackGenre`, `trackLabel`, `trackCopyright`
-- `**utils.randomUserAgent()` for Extensions\*\*: New utility function for extensions to get random browser User-Agent strings
-  - Returns modern Chrome User-Agent format: `Chrome/{120-145}.0.{6000-7499}.{100-299}` with `Windows NT 10.0`
-  - Useful for extensions that need to rotate User-Agents to avoid detection
-
-### Fixed
-
-- **Portuguese Language Bug**: Fixed locale parsing for languages with country codes (e.g., pt_PT, es_ES)
-  - App now correctly loads Portuguese and Spanish translations
-  - Updated Portuguese label to "Português (Brasil)"
-- **VM Race Condition Panic**: Fixed `panic during execution: runtime error: index out of range [-2]` crash when switching search providers
-  - Root cause: Goja VM was being accessed concurrently by multiple goroutines without synchronization
-  - Added `VMMu sync.Mutex` to `LoadedExtension` struct
-  - Added mutex lock/unlock to ALL `ExtensionProviderWrapper` methods:
-    - `SearchTracks`, `GetTrack`, `GetAlbum`, `GetArtist`
-    - `EnrichTrack`, `CheckAvailability`, `GetDownloadURL`, `Download`
-    - `CustomSearch`, `HandleURL`, `MatchTrack`, `PostProcess`
-  - Prevents race conditions when rapidly switching between extension search providers
-- **Tidal Release Date Fallback**: Fixed missing release date in FLAC metadata when downloading from Tidal
-  - Now uses Tidal API's release date when `req.ReleaseDate` is empty
-  - Ensures release date is always embedded in downloaded files
-- **Extended Metadata for M4A→FLAC Conversion**: Fixed genre, label, and copyright not being embedded when converting Amazon M4A to FLAC
-  - Flutter now extracts extended metadata from Go backend response
-  - Passes `genre`, `label`, `copyright` parameters to `_embedMetadataAndCover()`
-  - Tags correctly embedded during FFmpeg conversion
-- **Extended Metadata for MP3 Conversion**: Genre, label, and copyright now embedded in MP3 files when converting from FLAC
-  - Added `genre`, `label`, `copyright` parameters to `_embedMetadataToMp3()`
-  - Tags embedded as ID3v2: `GENRE`, `ORGANIZATION` (label), `COPYRIGHT`
-
-### Extensions
-
-- **spotify-web Extension**: Updated to v1.7.0
-  - Added `getMetadataFromDeezer()` function to fetch extended metadata:
-    - ISRC from track
-    - Label from album
-    - Copyright (generated as "YEAR LABEL")
-    - Genre from album genres
-    - Release date
-  - `enrichTrack()` now returns all extended metadata to Go backend
-  - Replaced all hardcoded User-Agent strings with `utils.randomUserAgent()`
-
-### Performance
-
-- **Faster App Startup**: Notification, Share Intent, and Cover Cache Manager initialization now run in parallel
-- **Download Queue Polling**: Batched progress updates reduce rebuilds and list allocations during active downloads
-- **Queue Item Updates**: Status/progress updates now skip no-op changes and update by index for fewer allocations
-- **Directory Creation**: Download output folders are created once per path, reducing repeated I/O for albums/singles
-- **Search Results Rendering**: Single-pass filtering avoids repeated `indexOf` calls for large result sets
-- **Queue Lookups in UI**: O(1) lookup for queue status in Home/Album/Playlist/Artist track lists
-- **History Filtering**: Album/single counts and grouping are computed once per build
-- **Downloaded Album View**: Tracks are grouped by disc in one pass to reduce filtering overhead
-- **Track Metadata Screen**:
-  - Palette extraction deferred until after transition; reduced sample size for smoother navigation
-  - File stat uses a single syscall and only triggers state updates on change
-  - Static regex/month table avoids repeated allocations
-  - Cover precached before opening metadata from history/queue/recents
-- **Flutter Provider Optimizations**:
-  - Cache `SharedPreferences` instance in `DownloadHistoryNotifier` and `DownloadQueueNotifier` to avoid repeated `getInstance()` calls
-  - Precompile regex for folder name sanitization and year extraction (top-level `final`)
-  - Use `indexWhere` instead of `firstWhere` with placeholder object to reduce allocations in queue processing
-- **Flutter UI Optimizations**:
-  - Selective `ref.watch()` for `downloadQueueProvider` (watch only `queuedCount` or `items` instead of entire state)
-  - Pass `Track` directly to `_buildTrackTile()` instead of index lookup inside builder
-  - Pass `historyItems` as parameter to `_buildRecentAccess()` to avoid `ref.read()` inside method
-- **M4A Metadata Embedding**: Streaming implementation reduces memory usage for large files
-  - Uses `os.Open()` + `ReadAt` instead of `os.ReadFile()` (no full file load into memory)
-  - Atomic file replacement via temp file + rename for safer writes
-  - New helper functions: `findAtomInRange()`, `readAtomHeaderAt()`, `copyRange()`
-
-### Backend
-
-- **Deezer ISRC Fetching**: Uses ISRCs already present in payloads and caches them, cutting extra API calls
-- **SearchAll Allocation**: Preallocated slices to reduce allocations during Deezer search
-- **HTTP Client Helper**: Refactored HTTP client creation to use `NewHTTPClientWithTimeout()` helper function across `lyrics.go`, `qobuz.go`, `tidal.go`
-
-### Technical
-
-- **Go Backend Changes**:
-  - `go_backend/extension_providers.go`: Added `Label`, `Copyright`, `Genre` fields to `ExtTrackMetadata`; added mutex locks to all provider methods
-  - `go_backend/extension_manager.go`: Added `VMMu sync.Mutex` to `LoadedExtension` struct
-  - `go_backend/extension_runtime.go`: Added `utils.randomUserAgent` function
-  - `go_backend/extension_runtime_utils.go`: Added `randomUserAgent()` implementation
-  - `go_backend/httputil.go`: Updated `getRandomUserAgent()` to use modern Chrome versions
-  - `go_backend/tidal.go`: Added release date fallback logic
-  - `go_backend/exports.go`: Added `Genre`, `Label`, `Copyright` fields to `DownloadResponse`
-- **Flutter Changes**:
-  - `lib/services/cover_cache_manager.dart`: New persistent cache manager for cover images (365 days, 1000 images max)
-  - `lib/widgets/cached_cover_image.dart`: Wrapper widget for CachedNetworkImage with persistent cache
-  - `lib/main.dart`: Added `CoverCacheManager.initialize()` to app startup
-  - `lib/screens/*.dart`: All 11 screens updated to use persistent cache manager for CachedNetworkImage
-  - `lib/providers/download_queue_provider.dart`: Updated `_embedMetadataAndCover()` to accept and embed genre, label, copyright; added `genre`, `label`, `copyright` fields to `DownloadHistoryItem`
-  - `lib/screens/track_metadata_screen.dart`: Display genre, label, copyright in metadata grid
-  - `lib/l10n/arb/app_en.arb`: Added `trackGenre`, `trackLabel`, `trackCopyright` localization strings
-
-### Dependencies
-
-- Added `flutter_cache_manager: ^3.4.1` (explicit dependency for persistent cache)
-- Added `path: ^1.9.0` (for cache directory path handling)
-
----
-
-## [3.1.2] - 2026-01-19
-
-### Added
-
-- **New Languages**: Added Spanish (es) and Portuguese (pt) translations
-  - Spanish: Credits 125 ([@credits125](https://crowdin.com/profile/credits125))
-  - Portuguese: Pedro Marcondes ([@justapedro](https://crowdin.com/profile/justapedro))
-  - Russian: Владислав ([@odinokiy_kot](https://crowdin.com/profile/odinokiy_kot))
-- **Quick Search Provider Switcher** ([#76](https://github.com/zarzet/SpotiFLAC-Mobile/issues/76)): Dropdown menu in search bar for instant provider switching
-  - Tap the search icon to reveal a dropdown menu with all available search providers
-  - Shows default provider (Deezer based on metadata source setting) at the top
-  - Lists all enabled extensions with custom search capability
-  - Displays extension icons when available
-  - Checkmark indicates currently selected provider
-  - Search hint text updates immediately when switching providers
-  - Re-triggers search automatically if there's existing text in the search bar
-  - Eliminates need to navigate to Settings > Extensions > Search Provider
-- **Extension Button Setting Type** ([#74](https://github.com/zarzet/SpotiFLAC-Mobile/issues/74)): New setting type for extension actions
-  - Extensions can define `button` type in manifest settings
-  - Triggers JavaScript function when tapped (e.g., start OAuth flow)
-  - Useful for authentication, manual sync, or any custom action
-- **Genre & Label Metadata** ([#75](https://github.com/zarzet/SpotiFLAC-Mobile/issues/75)): Downloaded tracks now include genre and record label information
-  - Fetches genre and label from Deezer album API for each track
-  - Embeds GENRE, ORGANIZATION (label), and COPYRIGHT tags into FLAC files
-  - Works automatically when Deezer track ID is available (via ISRC matching)
-  - Supports all download services (Tidal, Qobuz, Amazon) and extension downloads
-- **MP3 Quality Option** ([#69](https://github.com/zarzet/SpotiFLAC-Mobile/issues/69)): Optional MP3 download format with FLAC-to-MP3 conversion
-  - New "Enable MP3 Option" toggle in Settings > Download > Audio Quality
-  - When enabled, MP3 (320kbps) appears as a quality option alongside FLAC options
-  - Available in both the quality picker dialog and default quality settings
-  - Works with all services (Tidal, Qobuz, Amazon) and extensions
-- **MP3 Metadata Embedding**: Full metadata support for MP3 files
-  - Cover art embedded using ID3v2 tags
-  - Synced lyrics embedded (fetched from lrclib.net)
-  - All metadata preserved: title, artist, album, album artist, track/disc number, date, ISRC
-  - Automatic tag conversion from Vorbis comments (FLAC) to ID3v2 (MP3)
-- **Dominant Color Header**: Album, Playlist, Downloaded Album, and Track Metadata screens now feature dynamic header backgrounds
-  - Extracts dominant color from cover art using `palette_generator`
-  - Creates a gradient from dominant color to theme surface color
-  - Smooth 500ms color transition animation
-- **Larger Cover Art**: Cover images on detail screens are now 50% of screen width (previously 140px fixed)
-  - More prominent album artwork display
-  - Larger shadow and rounded corners (20px radius)
-  - Higher resolution cover caching
-- **Sticky Title**: Title appears in AppBar when scrolling past the info card
-  - Smooth fade-in animation (200ms) when scrolling down
-  - Title hidden when header is expanded (shows in info card instead)
-  - AppBar uses theme color (surface) for clean, native look
-  - Works on Album, Playlist, Downloaded Album, Track Metadata, and Artist screens
-- **Artist Name in Album Screen**: Album info card now displays artist name below album title
-  - Extracted from first track's artist metadata
-  - Styled with `onSurfaceVariant` color for visual hierarchy
-- **Disc Separation for Multi-Disc Albums** ([#70](https://github.com/zarzet/SpotiFLAC-Mobile/issues/70)): Downloaded albums with multiple discs now display tracks grouped by disc
-  - Visual disc separator header showing "Disc 1", "Disc 2", etc.
-  - Tracks sorted by disc number first, then by track number
-  - Single-disc albums display normally without separators
-  - Fixes confusion when albums have duplicate track numbers across discs
-- **Album Grouping in Recents** ([#70](https://github.com/zarzet/SpotiFLAC-Mobile/issues/70)): Downloads now show as albums instead of individual tracks in the Recent section
-  - Prevents flooding the recents list when downloading full albums
-  - Groups tracks by album name and artist
-  - Tapping navigates directly to the downloaded album screen
-  - Shows the most recent download time for each album
-
-### Changed
-
-- **FFmpeg FLAC-to-MP3 Conversion**: Improved conversion process
-  - MP3 files now saved in the same folder as FLAC (no separate MP3 subfolder)
-  - Original FLAC file automatically deleted after successful conversion
-  - New `embedMetadataToMp3()` method for MP3-specific tag embedding
-- **Sticky Header Theme Integration**: AppBar background uses `colorScheme.surface` instead of dominant color when collapsed
-  - Dark theme: Black background with white text
-  - Light theme: White background with black text
-  - Matches modern app behavior for better readability
-
-### Fixed
-
-- **MP3 Quality Display in Track Metadata**: Fixed incorrect quality display for MP3 files
-  - MP3 files now show "320kbps" instead of FLAC's bit depth/sample rate
-  - History no longer stores FLAC audio specs for converted MP3 files
-  - Both File Info badges and metadata grid show correct MP3 quality
-- **Empty Catch Blocks**: Fixed analyzer warnings for empty catch blocks
-  - `download_queue_provider.dart`: Added comments explaining why polling errors are silently ignored
-  - `track_provider.dart`: Added comments explaining why availability check errors are silently ignored
-  - `ffmpeg_service.dart`: Added proper error logging for temp file cleanup failures
-- **Russian Plural Forms**: Fixed ICU syntax warnings in Russian localization
-  - Removed redundant `=1` clauses that were overriding `one` plural category
-  - Affected 10 plural strings including track counts and delete confirmations
-  - Plurals now correctly handle Russian grammar (1 трек, 2 трека, 5 треков)
-
-### Dependencies
-
-- Added `palette_generator: ^0.3.3+4` for cover art color extraction
-
----
-
-## [3.1.1] - 2026-01-17
-
-### Added
-
-- **Lyrics Caching**: Lyrics are now cached for 24 hours to reduce API calls and improve performance
-  - Thread-safe cache with automatic expiration
-  - Cache key based on artist, track, and duration
-  - Log indicator shows "(cached)" when lyrics are served from cache
-- **Lyrics Duration Matching**: Improved lyrics accuracy with duration-based matching
-  - Compares track duration with lrclib.net results
-  - 10-second tolerance to handle version differences (radio edit, remaster, etc.)
-  - Prioritizes synced lyrics over plain text when duration matches
-  - Falls back gracefully if no duration match found
-- **Deezer Cover Art Upgrade**: Cover art from Deezer CDN now automatically upgraded to maximum quality
-  - Detects Deezer CDN URLs (`cdn-images.dzcdn.net`)
-  - Upgrades cover resolution to 1800x1800 (max available)
-  - Works alongside existing cover upgrade
-- **Live Search for Extensions**: Search-as-you-type functionality for extension search
-  - 800ms debounce delay to prevent excessive API calls
-  - Minimum 3 characters required before searching
-  - Concurrency control to prevent race conditions in extension runtime
-  - Queues pending searches if a search is already in progress
-- **Russian Language Support**: Added Russian (Русский) translation - 99% complete
-  - Translated via Crowdin community contributions
-  - Covers all UI elements, settings, and error messages
-
-### Fixed
-
-- **ISRC Index Race Condition**: Fixed repeated index rebuilding during parallel downloads
-  - Added per-directory build lock using `sync.Map` and `sync.Mutex`
-  - Double-check locking pattern ensures index is built only once
-  - Significantly improves performance during CSV import with many tracks
-- **Queue Tab Scroll Exception**: Fixed Flutter rendering exception with NestedScrollView
-  - Disabled Material 3 stretch overscroll indicator that caused `_StretchController` assertion
-  - Wrapped NestedScrollView with ScrollConfiguration to prevent `setState during build` errors
-  - Issue was especially noticeable during rapid queue updates (CSV import)
-- **CSV Import**: Fixed CSV export not being parsed correctly
-  - Added support for `Artist Name(s)` header (with parentheses)
-  - Added support for `Track URI` header for track IDs
-  - Added `artists` and `track_id` as alternative header names
-  - Now correctly parses "Liked Songs" and playlist exports
-
----
-
-## [3.1.0] - 2026-01-16
-
-### Added
-
-- **Recent Access History**: Quick access to recently visited content when tapping the search bar
-- **Artist Screen Redesign**: Full-width header, monthly listeners, top tracks section
-- **Extension Store Update Badge**: Badge indicator showing available extension updates
-- **Extension Compatibility Warning**: Warning for extensions requiring newer app version
-- **Year in Album Folder Name**: New folder structure options with release year
-- **Extension Album/Playlist/Artist Support**: Extensions can now return collections in search
-- **Odesli Integration**: YouTube Music extension can now match tracks to Deezer/Tidal/Qobuz
-- **Download Cancel**: Properly stops in-flight downloads
-
-### Changed
-
-- Search bar behavior improved with recent access history
-
-### Fixed
-
-- Multiple extension-related fixes for artist, album, and playlist handling
-- UI fixes for search, settings, and navigation
-
----
-
-## [3.0.0] - 2026-01-14
-
-### Extension System (Major Feature)
-
-SpotiFLAC 3.0 introduces a powerful extension system that allows third-party integrations for metadata, downloads, and more.
-
-- **Extension Store**: Browse and install extensions directly from the app
-- **Web Extension**: Metadata provider for personalized playlists
-- **Extension Capabilities**: Custom search, URL handlers, thumbnail ratios, post-processing
-- **Extension APIs**: Full HTTP, storage, file, and crypto support
-- **Security**: Sandboxed JavaScript runtime with permission-based access
-
-### Added
-
-- Album folder structure settings
-- Separate singles folder option
-- Year in album folder name
-- Parallel API calls for faster downloads
-- Swipeable history filters
-
-### Fixed
-
-- Tab edge overscroll
-- Extension duplicate load error
-- Settings item highlight on swipe
-- Back gesture freeze on Android 13+
-- Bottom overflow in dialogs
-- Japanese artist name matching
-- Multi-artist matching
-- Max resolution cover download
-- Various extension-related fixes
-
----
-
-_For older versions, see [GitHub Releases_](https://github.com/zarzet/SpotiFLAC-Mobile/releases)
+- Updated version to 1.1.0
+
+### Technical Details
+- Added `concurrentDownloads` field to `AppSettings` model (default: 1, max: 3)
+- Implemented worker pool pattern in `DownloadQueueNotifier` for parallel processing
+- Added `SetCurrentFile()`, `SetBytesTotal()`, and `ProgressWriter` for BTS downloads in Go backend
+- Added `strings.TrimSpace()` to all string fields in `DownloadTrack()` and `DownloadWithFallback()`
+- Added shared `http.Transport` with connection pooling in `httputil.go`
+- Added `CleanupConnections()` export for Flutter to call via method channel
+
+## [1.0.5] - Previous Release
+- Material Expressive 3 UI
+- Dynamic color support
+- Swipe navigation with PageView
+- Settings as bottom navigation tab
+- APK size optimization

CODE_OF_CONDUCT.md

@@ -1,133 +0,0 @@
-# Contributor Covenant Code of Conduct
-
-## Our Pledge
-
-We as members, contributors, and leaders pledge to make participation in our
-community a harassment-free experience for everyone, regardless of age, body
-size, visible or invisible disability, ethnicity, sex characteristics, gender
-identity and expression, level of experience, education, socio-economic status,
-nationality, personal appearance, race, caste, color, religion, or sexual
-identity and orientation.
-
-We pledge to act and interact in ways that contribute to an open, welcoming,
-diverse, inclusive, and healthy community.
-
-## Our Standards
-
-Examples of behavior that contributes to a positive environment for our
-community include:
-
-* Demonstrating empathy and kindness toward other people
-* Being respectful of differing opinions, viewpoints, and experiences
-* Giving and gracefully accepting constructive feedback
-* Accepting responsibility and apologizing to those affected by our mistakes,
-  and learning from the experience
-* Focusing on what is best not just for us as individuals, but for the overall
-  community
-
-Examples of unacceptable behavior include:
-
-* The use of sexualized language or imagery, and sexual attention or advances of
-  any kind
-* Trolling, insulting or derogatory comments, and personal or political attacks
-* Public or private harassment
-* Publishing others' private information, such as a physical or email address,
-  without their explicit permission
-* Other conduct which could reasonably be considered inappropriate in a
-  professional setting
-
-## Enforcement Responsibilities
-
-Community leaders are responsible for clarifying and enforcing our standards of
-acceptable behavior and will take appropriate and fair corrective action in
-response to any behavior that they deem inappropriate, threatening, offensive,
-or harmful.
-
-Community leaders have the right and responsibility to remove, edit, or reject
-comments, commits, code, wiki edits, issues, and other contributions that are
-not aligned to this Code of Conduct, and will communicate reasons for moderation
-decisions when appropriate.
-
-## Scope
-
-This Code of Conduct applies within all community spaces, and also applies when
-an individual is officially representing the community in public spaces.
-Examples of representing our community include using an official email address,
-posting via an official social media account, or acting as an appointed
-representative at an online or offline event.
-
-## Enforcement
-
-Instances of abusive, harassing, or otherwise unacceptable behavior may be
-reported to the community leaders responsible for enforcement at
-**[zarzet](https://github.com/zarzet)**.
-
-All complaints will be reviewed and investigated promptly and fairly.
-
-All community leaders are obligated to respect the privacy and security of the
-reporter of any incident.
-
-## Enforcement Guidelines
-
-Community leaders will follow these Community Impact Guidelines in determining
-the consequences for any action they deem in violation of this Code of Conduct:
-
-### 1. Correction
-
-**Community Impact**: Use of inappropriate language or other behavior deemed
-unprofessional or unwelcome in the community.
-
-**Consequence**: A private, written warning from community leaders, providing
-clarity around the nature of the violation and an explanation of why the
-behavior was inappropriate. A public apology may be requested.
-
-### 2. Warning
-
-**Community Impact**: A violation through a single incident or series of
-actions.
-
-**Consequence**: A warning with consequences for continued behavior. No
-interaction with the people involved, including unsolicited interaction with
-those enforcing the Code of Conduct, for a specified period of time. This
-includes avoiding interactions in community spaces as well as external channels
-like social media. Violating these terms may lead to a temporary or permanent
-ban.
-
-### 3. Temporary Ban
-
-**Community Impact**: A serious violation of community standards, including
-sustained inappropriate behavior.
-
-**Consequence**: A temporary ban from any sort of interaction or public
-communication with the community for a specified period of time. No public or
-private interaction with the people involved, including unsolicited interaction
-with those enforcing the Code of Conduct, is allowed during this period.
-Violating these terms may lead to a permanent ban.
-
-### 4. Permanent Ban
-
-**Community Impact**: Demonstrating a pattern of violation of community
-standards, including sustained inappropriate behavior, harassment of an
-individual, or aggression toward or disparagement of classes of individuals.
-
-**Consequence**: A permanent ban from any sort of public interaction within the
-community.
-
-## Attribution
-
-This Code of Conduct is adapted from the [Contributor Covenant][homepage],
-version 2.1, available at
-[https://www.contributor-covenant.org/version/2/1/code_of_conduct.html][v2.1].
-
-Community Impact Guidelines were inspired by
-[Mozilla's code of conduct enforcement ladder][Mozilla CoC].
-
-For answers to common questions about this code of conduct, see the FAQ at
-[https://www.contributor-covenant.org/faq][FAQ]. Translations are available at
-[https://www.contributor-covenant.org/translations][translations].
-
-[homepage]: https://www.contributor-covenant.org
-[v2.1]: https://www.contributor-covenant.org/version/2/1/code_of_conduct.html
-[Mozilla CoC]: https://github.com/mozilla/diversity
-[FAQ]: https://www.contributor-covenant.org/faq
-[translations]: https://www.contributor-covenant.org/translations

CONTRIBUTING.md

@@ -1,268 +0,0 @@
-# Contributing to SpotiFLAC
-
-First off, thank you for considering contributing to SpotiFLAC! 🎉
-
-This document provides guidelines and steps for contributing. Following these guidelines helps maintain code quality and ensures a smooth collaboration process.
-
-## Table of Contents
-
-- [Code of Conduct](#code-of-conduct)
-- [How Can I Contribute?](#how-can-i-contribute)
-  - [Reporting Bugs](#reporting-bugs)
-  - [Suggesting Features](#suggesting-features)
-  - [Code Contributions](#code-contributions)
-  - [Translations](#translations)
-- [Development Setup](#development-setup)
-- [Project Structure](#project-structure)
-- [Coding Guidelines](#coding-guidelines)
-- [Commit Guidelines](#commit-guidelines)
-- [Pull Request Process](#pull-request-process)
-
-## Code of Conduct
-
-This project and everyone participating in it is governed by our [Code of Conduct](CODE_OF_CONDUCT.md). By participating, you are expected to uphold this code. Please report unacceptable behavior to the project maintainers.
-
-## How Can I Contribute?
-
-### Reporting Bugs
-
-Before creating bug reports, please check the [existing issues](https://github.com/zarzet/SpotiFLAC-Mobile/issues) to avoid duplicates.
-
-When creating a bug report, please use the bug report template and include:
-
-- **Clear and descriptive title**
-- **Steps to reproduce** the issue
-- **Expected behavior** vs **actual behavior**
-- **Screenshots or screen recordings** if applicable
-- **Device information** (model, OS version)
-- **App version**
-- **Logs** from Settings > About > View Logs
-
-### Suggesting Features
-
-Feature requests are welcome! Please use the feature request template and:
-
-- **Check existing issues** to avoid duplicates
-- **Describe the feature** clearly
-- **Explain the use case** - why would this be useful?
-- **Consider the scope** - is this a small enhancement or a major feature?
-
-### Code Contributions
-
-1. **Fork the repository** and create your branch from `dev`
-2. **Make your changes** following our coding guidelines
-3. **Test your changes** thoroughly
-4. **Submit a pull request** to the `dev` branch
-
-### Translations
-
-We use [Crowdin](https://crowdin.com/project/spotiflac-mobile) for translations. To contribute:
-
-1. Visit our [Crowdin project](https://crowdin.com/project/spotiflac-mobile)
-2. Select your language or request a new one
-3. Start translating!
-
-Translation files are located in `lib/l10n/arb/`.
-
-## Development Setup
-
-### Prerequisites
-
-- **Flutter SDK** 3.10.0 or higher
-- **Dart SDK** 3.10.0 or higher
-- **Android Studio** or **VS Code** with Flutter extensions
-- **Git**
-
-### Getting Started
-
-1. **Clone your fork**
-   ```bash
-   git clone https://github.com/YOUR_USERNAME/SpotiFLAC-Mobile.git
-   cd SpotiFLAC-Mobile
-   ```
-
-2. **Add upstream remote**
-   ```bash
-   git remote add upstream https://github.com/zarzet/SpotiFLAC-Mobile.git
-   ```
-
-3. **Install dependencies**
-   ```bash
-   flutter pub get
-   ```
-
-4. **Generate code** (for Riverpod, JSON serialization, etc.)
-   ```bash
-   dart run build_runner build --delete-conflicting-outputs
-   ```
-
-5. **Run the app**
-   ```bash
-   flutter run
-   ```
-
-### Building
-
-```bash
-# Debug build
-flutter build apk --debug
-
-# Release build
-flutter build apk --release
-```
-
-## Project Structure
-
-```
-lib/
-├── l10n/               # Localization files
-│   └── arb/            # ARB translation files
-├── models/             # Data models
-├── providers/          # Riverpod providers
-├── screens/            # UI screens
-│   └── settings/       # Settings sub-screens
-├── services/           # Business logic services
-├── theme/              # App theming
-├── utils/              # Utility functions
-├── widgets/            # Reusable widgets
-├── app.dart            # App configuration
-└── main.dart           # Entry point
-```
-
-## Coding Guidelines
-
-### General
-
-- Follow [Effective Dart](https://dart.dev/effective-dart) guidelines
-- Use meaningful variable and function names
-- Keep functions small and focused
-- Add comments for complex logic
-
-### Formatting
-
-- Use `dart format` before committing
-- Maximum line length: 80 characters
-- Use trailing commas for better formatting
-
-```bash
-dart format .
-```
-
-### Linting
-
-Ensure your code passes all lints:
-
-```bash
-flutter analyze
-```
-
-### State Management
-
-We use **Riverpod** for state management. Follow these patterns:
-
-```dart
-// Use code generation with riverpod_annotation
-@riverpod
-class MyNotifier extends _$MyNotifier {
-  @override
-  MyState build() => MyState();
-  
-  // Methods to update state
-}
-```
-
-### Localization
-
-All user-facing strings should be localized:
-
-```dart
-// Good
-Text(AppLocalizations.of(context)!.downloadComplete)
-
-// Bad
-Text('Download Complete')
-```
-
-To add new strings:
-1. Add the key to `lib/l10n/arb/app_en.arb`
-2. Run `flutter gen-l10n`
-
-## Commit Guidelines
-
-We follow [Conventional Commits](https://www.conventionalcommits.org/):
-
-```
-<type>(<scope>): <description>
-
-[optional body]
-
-[optional footer(s)]
-```
-
-### Types
-
-- `feat`: New feature
-- `fix`: Bug fix
-- `docs`: Documentation changes
-- `style`: Code style changes (formatting, etc.)
-- `refactor`: Code refactoring
-- `perf`: Performance improvements
-- `test`: Adding or updating tests
-- `chore`: Maintenance tasks
-
-### Examples
-
-```
-feat(download): add batch download support
-fix(ui): resolve overflow on small screens
-docs: update contributing guidelines
-chore(deps): update flutter_riverpod to 3.1.0
-```
-
-## Pull Request Process
-
-1. **Update your fork**
-   ```bash
-   git fetch upstream
-   git rebase upstream/dev
-   ```
-
-2. **Create a feature branch**
-   ```bash
-   git checkout -b feat/my-new-feature
-   ```
-
-3. **Make your changes** and commit following our guidelines
-
-4. **Push to your fork**
-   ```bash
-   git push origin feat/my-new-feature
-   ```
-
-5. **Create a Pull Request**
-   - Target the `dev` branch
-   - Fill in the PR template
-   - Link related issues
-
-6. **Address review feedback**
-   - Make requested changes
-   - Push additional commits
-   - Request re-review when ready
-
-### PR Requirements
-
-- [ ] Code follows project conventions
-- [ ] All tests pass
-- [ ] No new linting errors
-- [ ] Documentation updated (if needed)
-- [ ] Commit messages follow guidelines
-- [ ] PR description is clear and complete
-
-## Questions?
-
-If you have questions, feel free to:
-
-- Open a [Discussion](https://github.com/zarzet/SpotiFLAC-Mobile/discussions)
-- Check existing [Issues](https://github.com/zarzet/SpotiFLAC-Mobile/issues)
-
-Thank you for contributing! 💚

README.md

@@ -1,12 +1,10 @@
-[![GitHub All Releases](https://img.shields.io/github/downloads/zarzet/SpotiFLAC-Mobile/total?style=for-the-badge&refresh=1)](https://github.com/zarzet/SpotiFLAC-Mobile/releases)
-[![VirusTotal](https://img.shields.io/badge/VirusTotal-Safe-brightgreen?style=for-the-badge&logo=virustotal)](https://www.virustotal.com/gui/file/516142f029a4f3642a899832a6f600acf07040170a98c106cd03222cf584d9a3)
-[![Crowdin](https://img.shields.io/badge/HELP%20TRANSLATE%20ON-CROWDIN-%2321252b?style=for-the-badge&logo=crowdin)](https://crowdin.com/project/spotiflac-mobile)
+[![GitHub All Releases](https://img.shields.io/github/downloads/zarzet/SpotiFLAC-Mobile/total?style=for-the-badge)](https://github.com/zarzet/SpotiFLAC-Mobile/releases)
 
 <div align="center">
 
 <img src="icon.png" width="128" />
 
-Download music in true lossless FLAC from Tidal, Qobuz & Amazon Music — no account required.
+Get Spotify tracks in true FLAC from Tidal, Qobuz & Amazon Music — no account required.
 
 ![Android](https://img.shields.io/badge/Android-7.0%2B-3DDC84?style=for-the-badge&logo=android&logoColor=white)
 ![iOS](https://img.shields.io/badge/iOS-14.0%2B-000000?style=for-the-badge&logo=apple&logoColor=white)
@@ -18,87 +16,23 @@ Download music in true lossless FLAC from Tidal, Qobuz & Amazon Music — no acc
 ## Screenshots
 
 <p align="center">
-  <img src="assets/images/1.jpg?v=2" width="200" />
-  <img src="assets/images/2.jpg?v=2" width="200" />
-  <img src="assets/images/3.jpg?v=2" width="200" />
-  <img src="assets/images/4.jpg?v=2" width="200" />
+  <img src="assets/images/Screenshot_20260101-210622_SpotiFLAC.png" width="200" />
+  <img src="assets/images/Screenshot_20260101-210626_SpotiFLAC.png" width="200" />
+  <img src="assets/images/photo_2026-01-01_23-56-11.jpg" width="200" />
+  <img src="assets/images/Screenshot_20260101-210653_SpotiFLAC.png" width="200" />
+  <img src="assets/images/photo_2026-01-01_23-44-06.jpg" width="200" />
 </p>
 
-## Search Source
-
-SpotiFLAC supports multiple search sources for finding music metadata:
-
-| Source | Setup |
-|--------|-------|
-| **Deezer** (Default) | No setup required |
-| **Extensions** | Install additional search providers from the Store |
-
-## Extensions
-
-Extensions allow the community to add new music sources and features without waiting for app updates. When a streaming service API changes or a new source becomes available, extensions can be updated independently.
-
-### Installing Extensions
-1. Go to **Store** tab in the app
-2. Browse and install extensions with one tap
-3. Or download a `.spotiflac-ext` file and install manually via **Settings > Extensions**
-4. Configure extension settings if needed
-5. Set provider priority in **Settings > Extensions > Provider Priority**
-
-### Developing Extensions
-Want to create your own extension? Check out the [Extension Development Guide](https://zarz.moe/docs) for complete documentation.
-
 ## Other project
 
 ### [SpotiFLAC (Desktop)](https://github.com/afkarxyz/SpotiFLAC)
-Download music in true lossless FLAC from Tidal, Qobuz & Amazon Music for Windows, macOS & Linux
-
-## Telegram
-
-<p align="center">
-  <a href="https://t.me/spotiflac">
-    <img src="https://img.shields.io/badge/Telegram-Channel-2CA5E0?style=for-the-badge&logo=telegram&logoColor=white" alt="Telegram Channel">
-  </a>
-
-  <a href="https://t.me/spotiflac_chat">
-    <img src="https://img.shields.io/badge/Telegram-Community-2CA5E0?style=for-the-badge&logo=telegram&logoColor=white" alt="Telegram Community">
-  </a>
-</p>
-
-## FAQ
-
-**Q: Why is my download failing with "Song not found"?**  
-A: The track may not be available on Tidal, Qobuz, or Amazon Music. Try enabling more download services in Settings > Download > Provider Priority, or install additional extensions from the Store.
-
-**Q: Why are some tracks downloading in lower quality?**  
-A: Quality depends on what's available from the streaming service. Tidal offers up to 24-bit/192kHz, Qobuz up to 24-bit/192kHz, and Amazon up to 24-bit/48kHz. The app automatically selects the best available quality.
-
-**Q: Can I download playlists?**  
-A: Yes! Just paste the playlist URL in the search bar. The app will fetch all tracks and queue them for download.
-
-**Q: Why do I need to grant storage permission?**  
-A: The app needs permission to save downloaded files to your device. On Android 13+, you may need to grant "All files access" in Settings > Apps > SpotiFLAC > Permissions.
-
-**Q: Is this app safe?**  
-A: Yes, the app is open source and you can verify the code yourself. Each release is scanned with VirusTotal (see badge at top of README).
-
-**Q: Why is download not working in my country?**  
-A: Some countries have restricted access to certain streaming service APIs. If downloads are failing, try using a VPN to connect through a different region.
-
-
-### Want to support SpotiFLAC-Mobile?
-
-_If this software is useful and brings you value, consider supporting the project by buying me a coffee. Your support helps keep development going._
-
-[![Ko-fi](https://ko-fi.com/img/githubbutton_sm.svg)](https://ko-fi.com/zarzet) <a href="https://www.buymeacoffee.com/zarzet" target="_blank"><img src="https://cdn.buymeacoffee.com/buttons/v2/default-yellow.png" alt="Buy Me A Coffee" style="height: 40px !important;width: 150px !important;" ></a>
-
+Get Spotify tracks in true FLAC from Tidal, Qobuz & Amazon Music for Windows, macOS & Linux
 
 ## Disclaimer
 
 This project is for **educational and private use only**. The developer does not condone or encourage copyright infringement.
 
-**SpotiFLAC** is a third-party tool and is not affiliated with, endorsed by, or connected to Tidal, Qobuz, Amazon Music, Deezer, or any other streaming service.
-
-The application is purely a user interface that facilitates communication between your device and existing third-party services.
+**SpotiFLAC** is a third-party tool and is not affiliated with, endorsed by, or connected to Spotify, Tidal, Qobuz, Amazon Music, or any other streaming service.
 
 You are solely responsible for:
 1. Ensuring your use of this software complies with your local laws.
@@ -106,8 +40,3 @@ You are solely responsible for:
 3. Any legal consequences resulting from the misuse of this tool.
 
 The software is provided "as is", without warranty of any kind. The author assumes no liability for any bans, damages, or legal issues arising from its use.
-
-
-> [!TIP]
->
-> **Star Us**, You will receive all release notifications from GitHub without any delay ~

android/app/build.gradle.kts

@@ -1,6 +1,3 @@
-import java.util.Properties
-import java.io.FileInputStream
-
 plugins {
     id("com.android.application")
     id("kotlin-android")
@@ -8,13 +5,6 @@ plugins {
     id("dev.flutter.flutter-gradle-plugin")
 }
 
-// Load keystore properties for local builds
-val keystorePropertiesFile = rootProject.file("key.properties")
-val keystoreProperties = Properties()
-if (keystorePropertiesFile.exists()) {
-    keystoreProperties.load(FileInputStream(keystorePropertiesFile))
-}
-
 android {
     namespace = "com.zarz.spotiflac"
     compileSdk = flutter.compileSdkVersion
@@ -32,25 +22,16 @@ android {
         }
     }
 
-    signingConfigs {
-        if (keystorePropertiesFile.exists()) {
-            create("release") {
-                keyAlias = keystoreProperties.getProperty("keyAlias")
-                keyPassword = keystoreProperties.getProperty("keyPassword")
-                storeFile = file(keystoreProperties.getProperty("storeFile"))
-                storePassword = keystoreProperties.getProperty("storePassword")
-            }
-        }
-    }
-
     defaultConfig {
         applicationId = "com.zarz.spotiflac"
         minSdk = flutter.minSdkVersion
-        targetSdk = 36
+        targetSdk = 34
         versionCode = flutter.versionCode
         versionName = flutter.versionName
         multiDexEnabled = true
         
+        // Only include arm64-v8a for smaller APK (most modern devices)
+        // Remove this line if you need to support older 32-bit devices
         ndk {
             abiFilters += listOf("arm64-v8a", "armeabi-v7a")
         }
@@ -58,13 +39,8 @@ android {
 
     buildTypes {
         release {
-            // For local builds: use release signing if key.properties exists
-            // For CI builds: APK is signed by GitHub Action after build
-            signingConfig = if (keystorePropertiesFile.exists()) {
-                signingConfigs.getByName("release")
-            } else {
-                signingConfigs.getByName("debug")
-            }
+            signingConfig = signingConfigs.getByName("debug")
+            // Enable code shrinking and resource shrinking
             isMinifyEnabled = true
             isShrinkResources = true
             proguardFiles(
@@ -96,13 +72,8 @@ repositories {
 }
 
 dependencies {
-    coreLibraryDesugaring("com.android.tools:desugar_jdk_libs:2.1.4")
-    
-    // Include all AAR and JAR files from libs folder
-    implementation(fileTree(mapOf("dir" to "libs", "include" to listOf("*.jar", "*.aar"))))
-    
+    coreLibraryDesugaring("com.android.tools:desugar_jdk_libs:2.0.4")
+    implementation(files("libs/gobackend.aar"))
     implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.7.3")
     implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.7.0")
-    implementation("androidx.documentfile:documentfile:1.0.1")
-    implementation("androidx.activity:activity-ktx:1.9.0")
 }

android/app/proguard-rules.pro

@@ -5,112 +5,29 @@
 -keep class io.flutter.view.** { *; }
 -keep class io.flutter.** { *; }
 -keep class io.flutter.plugins.** { *; }
--keep class io.flutter.embedding.** { *; }
 
-# Ignore missing Play Core classes (not used, but referenced by Flutter)
--dontwarn com.google.android.play.core.splitcompat.**
--dontwarn com.google.android.play.core.splitinstall.**
--dontwarn com.google.android.play.core.tasks.**
-
-# Ignore missing javax.xml.stream (not used on Android)
--dontwarn javax.xml.stream.**
-
-# Go backend (gobackend.aar) - CRITICAL for release builds
+# Go backend (gobackend.aar)
 -keep class gobackend.** { *; }
 -keep class go.** { *; }
--keep interface gobackend.** { *; }
--keepclassmembers class gobackend.** { *; }
-
-# Go mobile binding internals
--keep class org.golang.** { *; }
--dontwarn org.golang.**
 
 # FFmpeg Kit
 -keep class com.arthenica.ffmpegkit.** { *; }
 -keep class com.arthenica.smartexception.** { *; }
-# FFmpeg Kit (new fork package)
--keep class com.antonkarpenko.ffmpegkit.** { *; }
--keep class com.antonkarpenko.smartexception.** { *; }
-
-# Apache Tika (if used by FFmpeg)
--dontwarn org.apache.tika.**
 
 # Keep native methods
 -keepclasseswithmembernames class * {
     native <methods>;
 }
 
-# Kotlin coroutines - expanded rules
+# Kotlin coroutines
 -keepnames class kotlinx.coroutines.internal.MainDispatcherFactory {}
 -keepnames class kotlinx.coroutines.CoroutineExceptionHandler {}
 -keepclassmembers class kotlinx.coroutines.** {
     volatile <fields>;
 }
--keepclassmembernames class kotlinx.** {
-    volatile <fields>;
-}
--dontwarn kotlinx.coroutines.**
-
-# Kotlin serialization
--keepattributes RuntimeVisibleAnnotations,AnnotationDefault
--dontwarn kotlin.**
--keep class kotlin.** { *; }
--keep class kotlin.Metadata { *; }
-
-# Keep MainActivity and related classes
--keep class com.zarz.spotiflac.** { *; }
 
 # Prevent R8 from removing metadata
 -keepattributes *Annotation*
 -keepattributes SourceFile,LineNumberTable
 -keepattributes Signature
 -keepattributes Exceptions
--keepattributes InnerClasses
--keepattributes EnclosingMethod
-
-# JSON parsing (used by Go backend responses)
--keep class org.json.** { *; }
-
-# Shared Preferences
--keep class androidx.datastore.** { *; }
--dontwarn androidx.datastore.**
-
-# Flutter Plugins - CRITICAL: Prevent R8 from removing plugin implementations
-# Path Provider
--keep class io.flutter.plugins.pathprovider.** { *; }
--keep class dev.flutter.pigeon.** { *; }
-
-# Local Notifications
--keep class com.dexterous.** { *; }
--keep class com.dexterous.flutterlocalnotifications.** { *; }
-
-# Receive Sharing Intent
--keep class com.kasem.receive_sharing_intent.** { *; }
-
-# Permission Handler
--keep class com.baseflow.permissionhandler.** { *; }
-
-# File Picker
--keep class com.mr.flutter.plugin.filepicker.** { *; }
-
-# URL Launcher
--keep class io.flutter.plugins.urllauncher.** { *; }
-
-# Share Plus
--keep class dev.fluttercommunity.plus.share.** { *; }
-
-# Device Info Plus
--keep class dev.fluttercommunity.plus.device_info.** { *; }
-
-# Open File
--keep class com.crazecoder.openfile.** { *; }
-
-# Sqflite
--keep class com.tekartik.sqflite.** { *; }
-
-# Dynamic Color
--keep class io.material.** { *; }
-
-# Keep all Flutter plugin registrants
--keep class io.flutter.plugins.GeneratedPluginRegistrant { *; }
--keep class ** extends io.flutter.embedding.engine.plugins.FlutterPlugin { *; }

android/app/src/main/AndroidManifest.xml

@@ -4,30 +4,26 @@
     <!-- Permissions -->
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" 
-        android:maxSdkVersion="29" />
+        android:maxSdkVersion="28" />
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" 
         android:maxSdkVersion="32" />
-    <!-- For Android 11+ (API 30-32) - full storage access -->
-    <uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.READ_MEDIA_AUDIO" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_DATA_SYNC" />
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
-    <uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />
-    <uses-permission android:name="android.permission.WAKE_LOCK" />
 
     <application
         android:label="SpotiFLAC"
         android:name="${applicationName}"
         android:icon="@mipmap/ic_launcher"
-        android:usesCleartextTraffic="false"
-        android:enableOnBackInvokedCallback="true"
-        android:localeConfig="@xml/locale_config">
+        android:requestLegacyExternalStorage="true"
+        android:usesCleartextTraffic="true">
 
         <activity
             android:name=".MainActivity"
             android:exported="true"
-            android:launchMode="singleTask"
+            android:launchMode="singleTop"
+            android:taskAffinity=""
             android:theme="@style/LaunchTheme"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
             android:hardwareAccelerated="true"
@@ -43,7 +39,7 @@
                 <category android:name="android.intent.category.LAUNCHER"/>
             </intent-filter>
 
-            <!-- Handle music URL sharing (Spotify, Deezer, Tidal, YT Music) -->
+            <!-- Handle Spotify URL sharing -->
             <intent-filter>
                 <action android:name="android.intent.action.SEND" />
                 <category android:name="android.intent.category.DEFAULT" />
@@ -57,33 +53,6 @@
                 <category android:name="android.intent.category.BROWSABLE" />
                 <data android:scheme="https" android:host="open.spotify.com" />
             </intent-filter>
-
-            <!-- Handle Deezer deep links -->
-            <intent-filter android:autoVerify="true">
-                <action android:name="android.intent.action.VIEW" />
-                <category android:name="android.intent.category.DEFAULT" />
-                <category android:name="android.intent.category.BROWSABLE" />
-                <data android:scheme="https" android:host="www.deezer.com" />
-                <data android:scheme="https" android:host="deezer.com" />
-                <data android:scheme="https" android:host="deezer.page.link" />
-            </intent-filter>
-
-            <!-- Handle Tidal deep links -->
-            <intent-filter android:autoVerify="true">
-                <action android:name="android.intent.action.VIEW" />
-                <category android:name="android.intent.category.DEFAULT" />
-                <category android:name="android.intent.category.BROWSABLE" />
-                <data android:scheme="https" android:host="tidal.com" />
-                <data android:scheme="https" android:host="listen.tidal.com" />
-            </intent-filter>
-
-            <!-- Handle YouTube Music deep links -->
-            <intent-filter android:autoVerify="true">
-                <action android:name="android.intent.action.VIEW" />
-                <category android:name="android.intent.category.DEFAULT" />
-                <category android:name="android.intent.category.BROWSABLE" />
-                <data android:scheme="https" android:host="music.youtube.com" />
-            </intent-filter>
         </activity>
 
         <!-- Download Service -->
@@ -107,17 +76,6 @@
         <meta-data
             android:name="flutterEmbedding"
             android:value="2" />
-
-        <!-- FileProvider for APK installation -->
-        <provider
-            android:name="androidx.core.content.FileProvider"
-            android:authorities="${applicationId}.fileProvider"
-            android:exported="false"
-            android:grantUriPermissions="true">
-            <meta-data
-                android:name="android.support.FILE_PROVIDER_PATHS"
-                android:resource="@xml/file_paths" />
-        </provider>
     </application>
 
     <queries>

android/app/src/main/kotlin/com/zarz/spotiflac/DownloadService.kt

@@ -5,227 +5,83 @@ import android.app.NotificationChannel
 import android.app.NotificationManager
 import android.app.PendingIntent
 import android.app.Service
-import android.content.Context
 import android.content.Intent
 import android.os.Build
 import android.os.IBinder
-import android.os.PowerManager
 import androidx.core.app.NotificationCompat
 
-/**
- * Foreground service to keep downloads running when app is in background.
- * This prevents Android from killing the download process or throttling network.
- * 
- * Note: Android 15+ (API 35+) has a 6-hour timeout for dataSync foreground services.
- * The service will be stopped automatically after 6 hours of cumulative runtime in 24 hours.
- */
 class DownloadService : Service() {
-    
     companion object {
-        private const val CHANNEL_ID = "download_channel"
-        private const val NOTIFICATION_ID = 1001
-        private const val WAKELOCK_TAG = "SpotiFLAC:DownloadWakeLock"
-        
-        const val ACTION_START = "com.zarz.spotiflac.action.START_DOWNLOAD"
-        const val ACTION_STOP = "com.zarz.spotiflac.action.STOP_DOWNLOAD"
-        const val ACTION_UPDATE_PROGRESS = "com.zarz.spotiflac.action.UPDATE_PROGRESS"
-        
-        const val EXTRA_TRACK_NAME = "track_name"
-        const val EXTRA_ARTIST_NAME = "artist_name"
-        const val EXTRA_PROGRESS = "progress"
-        const val EXTRA_TOTAL = "total"
-        const val EXTRA_QUEUE_COUNT = "queue_count"
-        
-        private var isRunning = false
-        
-        fun isServiceRunning(): Boolean = isRunning
-        
-        fun start(context: Context, trackName: String = "", artistName: String = "", queueCount: Int = 0) {
-            val intent = Intent(context, DownloadService::class.java).apply {
-                action = ACTION_START
-                putExtra(EXTRA_TRACK_NAME, trackName)
-                putExtra(EXTRA_ARTIST_NAME, artistName)
-                putExtra(EXTRA_QUEUE_COUNT, queueCount)
-            }
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
-                context.startForegroundService(intent)
-            } else {
-                context.startService(intent)
-            }
-        }
-        
-        fun stop(context: Context) {
-            val intent = Intent(context, DownloadService::class.java).apply {
-                action = ACTION_STOP
-            }
-            context.startService(intent)
-        }
-        
-        fun updateProgress(context: Context, trackName: String, artistName: String, progress: Long, total: Long, queueCount: Int) {
-            val intent = Intent(context, DownloadService::class.java).apply {
-                action = ACTION_UPDATE_PROGRESS
-                putExtra(EXTRA_TRACK_NAME, trackName)
-                putExtra(EXTRA_ARTIST_NAME, artistName)
-                putExtra(EXTRA_PROGRESS, progress)
-                putExtra(EXTRA_TOTAL, total)
-                putExtra(EXTRA_QUEUE_COUNT, queueCount)
-            }
-            context.startService(intent)
-        }
+        const val CHANNEL_ID = "spotiflac_download_channel"
+        const val NOTIFICATION_ID = 1
+        const val ACTION_START = "com.zarz.spotiflac.START_DOWNLOAD"
+        const val ACTION_STOP = "com.zarz.spotiflac.STOP_DOWNLOAD"
     }
-    
-    private var wakeLock: PowerManager.WakeLock? = null
-    private var currentTrackName = ""
-    private var currentArtistName = ""
-    private var queueCount = 0
-    
+
     override fun onCreate() {
         super.onCreate()
         createNotificationChannel()
     }
-    
+
     override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
         when (intent?.action) {
-            ACTION_START -> {
-                currentTrackName = intent.getStringExtra(EXTRA_TRACK_NAME) ?: ""
-                currentArtistName = intent.getStringExtra(EXTRA_ARTIST_NAME) ?: ""
-                queueCount = intent.getIntExtra(EXTRA_QUEUE_COUNT, 0)
-                startForegroundService()
-            }
-            ACTION_STOP -> {
-                stopForegroundService()
-            }
-            ACTION_UPDATE_PROGRESS -> {
-                currentTrackName = intent.getStringExtra(EXTRA_TRACK_NAME) ?: currentTrackName
-                currentArtistName = intent.getStringExtra(EXTRA_ARTIST_NAME) ?: currentArtistName
-                val progress = intent.getLongExtra(EXTRA_PROGRESS, 0)
-                val total = intent.getLongExtra(EXTRA_TOTAL, 0)
-                queueCount = intent.getIntExtra(EXTRA_QUEUE_COUNT, queueCount)
-                updateNotification(progress, total)
-            }
+            ACTION_START -> startForegroundService()
+            ACTION_STOP -> stopSelf()
         }
-        return START_STICKY
+        return START_NOT_STICKY
     }
-    
+
     override fun onBind(intent: Intent?): IBinder? = null
-    
-    /**
-     * Called when the foreground service timeout is reached (Android 15+, API 35+).
-     * dataSync services have a 6-hour limit in a 24-hour period.
-     * We must call stopSelf() within a few seconds to avoid a crash.
-     */
-    override fun onTimeout(startId: Int, fgsType: Int) {
-        // Log the timeout for debugging
-        android.util.Log.w("DownloadService", "Foreground service timeout reached (6 hours limit). Stopping service.")
-        
-        // Gracefully stop the service
-        stopForegroundService()
-    }
-    
+
     private fun createNotificationChannel() {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
             val channel = NotificationChannel(
                 CHANNEL_ID,
-                "Download Service",
+                "Download Progress",
                 NotificationManager.IMPORTANCE_LOW
             ).apply {
-                description = "Shows download progress"
+                description = "Shows download progress for SpotiFLAC"
                 setShowBadge(false)
             }
             val manager = getSystemService(NotificationManager::class.java)
             manager.createNotificationChannel(channel)
         }
     }
-    
+
     private fun startForegroundService() {
-        isRunning = true
-        
-        // Acquire wake lock to prevent CPU sleep
-        val powerManager = getSystemService(Context.POWER_SERVICE) as PowerManager
-        wakeLock = powerManager.newWakeLock(
-            PowerManager.PARTIAL_WAKE_LOCK,
-            WAKELOCK_TAG
-        ).apply {
-            acquire(60 * 60 * 1000L) // 1 hour max
-        }
-        
-        val notification = buildNotification(0, 0)
+        val notification = createNotification("Downloading...", 0)
         startForeground(NOTIFICATION_ID, notification)
     }
-    
-    private fun stopForegroundService() {
-        isRunning = false
-        wakeLock?.let {
-            if (it.isHeld) {
-                it.release()
-            }
-        }
-        wakeLock = null
-        stopForeground(STOP_FOREGROUND_REMOVE)
-        stopSelf()
-    }
-    
-    private fun updateNotification(progress: Long, total: Long) {
-        if (!isRunning) return
-        
-        val notification = buildNotification(progress, total)
+
+    fun updateProgress(trackName: String, progress: Int) {
+        val notification = createNotification(trackName, progress)
         val manager = getSystemService(NotificationManager::class.java)
         manager.notify(NOTIFICATION_ID, notification)
     }
-    
-    private fun buildNotification(progress: Long, total: Long): Notification {
+
+    private fun createNotification(title: String, progress: Int): Notification {
+        val intent = Intent(this, MainActivity::class.java)
         val pendingIntent = PendingIntent.getActivity(
-            this,
-            0,
-            Intent(this, MainActivity::class.java),
+            this, 0, intent,
             PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE
         )
-        
-        val title = if (queueCount > 1) {
-            "Downloading $queueCount tracks"
-        } else if (currentTrackName.isNotEmpty()) {
-            currentTrackName
-        } else {
-            "Downloading..."
+
+        val stopIntent = Intent(this, DownloadService::class.java).apply {
+            action = ACTION_STOP
         }
-        
-        val text = if (currentArtistName.isNotEmpty() && queueCount <= 1) {
-            currentArtistName
-        } else if (total > 0) {
-            val progressPercent = (progress * 100 / total).toInt()
-            val progressMB = progress / (1024.0 * 1024.0)
-            val totalMB = total / (1024.0 * 1024.0)
-            String.format("%.1f / %.1f MB (%d%%)", progressMB, totalMB, progressPercent)
-        } else {
-            "Preparing download..."
-        }
-        
-        val builder = NotificationCompat.Builder(this, CHANNEL_ID)
-            .setContentTitle(title)
-            .setContentText(text)
+        val stopPendingIntent = PendingIntent.getService(
+            this, 0, stopIntent,
+            PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE
+        )
+
+        return NotificationCompat.Builder(this, CHANNEL_ID)
+            .setContentTitle("SpotiFLAC")
+            .setContentText(title)
             .setSmallIcon(android.R.drawable.stat_sys_download)
-            .setContentIntent(pendingIntent)
+            .setProgress(100, progress, progress == 0)
             .setOngoing(true)
-            .setOnlyAlertOnce(true)
-            .setPriority(NotificationCompat.PRIORITY_LOW)
-            .setCategory(NotificationCompat.CATEGORY_PROGRESS)
-        
-        if (total > 0) {
-            builder.setProgress(100, (progress * 100 / total).toInt(), false)
-        } else {
-            builder.setProgress(0, 0, true)
-        }
-        
-        return builder.build()
-    }
-    
-    override fun onDestroy() {
-        isRunning = false
-        wakeLock?.let {
-            if (it.isHeld) {
-                it.release()
-            }
-        }
-        super.onDestroy()
+            .setContentIntent(pendingIntent)
+            .addAction(android.R.drawable.ic_menu_close_clear_cancel, "Cancel", stopPendingIntent)
+            .build()
     }
 }

android/app/src/main/res/xml/file_paths.xml

@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<paths>
-    <external-files-path name="external_files" path="." />
-    <cache-path name="cache" path="." />
-    <files-path name="files" path="." />
-</paths>

android/app/src/main/res/xml/locale_config.xml

@@ -1,16 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<locale-config xmlns:android="http://schemas.android.com/apk/res/android">
-    <locale android:name="en" />
-    <locale android:name="ru" />
-    <locale android:name="es-ES" />
-    <locale android:name="id" />
-    <locale android:name="pt-PT" />
-    <locale android:name="ja" />
-    <locale android:name="tr" />
-    <locale android:name="de" />
-    <locale android:name="fr" />
-    <locale android:name="hi" />
-    <locale android:name="ko" />
-    <locale android:name="nl" />
-    <locale android:name="zh" />
-</locale-config>

android/build.gradle.kts

@@ -10,19 +10,10 @@ subprojects {
         if (project.hasProperty("android")) {
             project.extensions.configure<com.android.build.gradle.BaseExtension>("android") {
                 compileOptions {
-                    isCoreLibraryDesugaringEnabled = true
                     sourceCompatibility = JavaVersion.VERSION_17
                     targetCompatibility = JavaVersion.VERSION_17
                 }
-                
-                // Enable multidex for all subprojects
-                defaultConfig {
-                    multiDexEnabled = true
-                }
             }
-            
-            // Add desugaring dependency to all Android subprojects
-            project.dependencies.add("coreLibraryDesugaring", "com.android.tools:desugar_jdk_libs:2.1.4")
         }
         
         tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile>().configureEach {

android/gradle.properties

@@ -1,2 +1,2 @@
-org.gradle.jvmargs=-Xmx4G -XX:MaxMetaspaceSize=2G -XX:ReservedCodeCacheSize=256m -XX:+HeapDumpOnOutOfMemoryError
+org.gradle.jvmargs=-Xmx8G -XX:MaxMetaspaceSize=4G -XX:ReservedCodeCacheSize=512m -XX:+HeapDumpOnOutOfMemoryError
 android.useAndroidX=true

android/gradle/wrapper/gradle-wrapper.properties

@@ -2,4 +2,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-9.3.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.14-all.zip

android/settings.gradle.kts

@@ -20,7 +20,7 @@ pluginManagement {
 plugins {
     id("dev.flutter.flutter-plugin-loader") version "1.0.0"
     id("com.android.application") version "8.11.1" apply false
-    id("org.jetbrains.kotlin.android") version "2.3.0" apply false
+    id("org.jetbrains.kotlin.android") version "2.2.20" apply false
 }
 
 include(":app")

crowdin.yml

@@ -1,19 +0,0 @@
-files:
-  - source: /lib/l10n/arb/app_en.arb
-    translation: /lib/l10n/arb/app_%locale%.arb
-    languages_mapping:
-      locale:
-        # Short codes for single-variant languages
-        de: de
-        es: es
-        fr: fr
-        hi: hi
-        id: id
-        ja: ja
-        ko: ko
-        nl: nl
-        pt: pt
-        ru: ru
-        # Full codes for Chinese variants
-        zh-CN: zh_CN
-        zh-TW: zh_TW

devtools_options.yaml

@@ -1,3 +0,0 @@
-description: This file stores settings for Dart & Flutter DevTools.
-documentation: https://docs.flutter.dev/tools/devtools/extensions#configure-extension-enablement-states
-extensions:

go_backend/amazon.go

@@ -1,169 +1,214 @@
 package gobackend
 
 import (
-	"bufio"
-	"context"
+	"encoding/base64"
 	"encoding/json"
-	"errors"
 	"fmt"
 	"io"
 	"net/http"
 	"net/url"
 	"os"
 	"path/filepath"
-	"regexp"
 	"strings"
-	"sync"
 	"time"
 )
 
-// Amazon API timeout and retry configuration for mobile networks
-const (
-	amazonAPITimeoutMobile = 30 * time.Second // Longer timeout for unstable mobile networks
-	amazonMaxRetries       = 2                // Number of retry attempts
-	amazonRetryDelay       = 500 * time.Millisecond
-)
-
+// AmazonDownloader handles Amazon Music downloads using DoubleDouble service (same as PC)
 type AmazonDownloader struct {
-	client *http.Client
+	client  *http.Client
+	regions []string // us, eu regions for DoubleDouble service
 }
 
-var (
-	globalAmazonDownloader *AmazonDownloader
-	amazonDownloaderOnce   sync.Once
-)
-
-// AfkarXYZResponse is the response from AfkarXYZ API
-type AfkarXYZResponse struct {
-	Success bool `json:"success"`
-	Data    struct {
-		DirectLink string `json:"direct_link"`
-		FileName   string `json:"file_name"`
-		FileSize   int64  `json:"file_size"`
-	} `json:"data"`
+// DoubleDoubleSubmitResponse is the response from DoubleDouble submit endpoint
+type DoubleDoubleSubmitResponse struct {
+	Success bool   `json:"success"`
+	ID      string `json:"id"`
 }
 
+// DoubleDoubleStatusResponse is the response from DoubleDouble status endpoint
+type DoubleDoubleStatusResponse struct {
+	Status         string `json:"status"`
+	FriendlyStatus string `json:"friendlyStatus"`
+	URL            string `json:"url"`
+	Current        struct {
+		Name   string `json:"name"`
+		Artist string `json:"artist"`
+	} `json:"current"`
+}
+
+// NewAmazonDownloader creates a new Amazon downloader using DoubleDouble service
 func NewAmazonDownloader() *AmazonDownloader {
-	amazonDownloaderOnce.Do(func() {
-		globalAmazonDownloader = &AmazonDownloader{
-			client: NewHTTPClientWithTimeout(120 * time.Second),
-		}
-	})
-	return globalAmazonDownloader
+	return &AmazonDownloader{
+		client:  NewHTTPClientWithTimeout(120 * time.Second), // 120s timeout like PC
+		regions: []string{"us", "eu"},                        // Same regions as PC
+	}
 }
 
-// fetchAmazonURLWithRetry fetches from AfkarXYZ API with retry logic for mobile networks
-func (a *AmazonDownloader) fetchAmazonURLWithRetry(amazonURL string) (string, string, error) {
-	apiURL := "https://amazon.afkarxyz.fun/convert?url=" + url.QueryEscape(amazonURL)
-
-	var lastErr error
-	for attempt := 0; attempt <= amazonMaxRetries; attempt++ {
-		if attempt > 0 {
-			delay := amazonRetryDelay * time.Duration(1<<(attempt-1)) // Exponential backoff
-			GoLog("[Amazon] Retry %d/%d after %v...\n", attempt, amazonMaxRetries, delay)
-			time.Sleep(delay)
-		}
-
-		downloadURL, fileName, err := a.doAfkarXYZRequest(apiURL)
-		if err == nil {
-			return downloadURL, fileName, nil
-		}
-
-		lastErr = err
-		errStr := err.Error()
-
-		// Check if error is retryable
-		isRetryable := strings.Contains(errStr, "timeout") ||
-			strings.Contains(errStr, "connection reset") ||
-			strings.Contains(errStr, "connection refused") ||
-			strings.Contains(errStr, "EOF") ||
-			strings.Contains(errStr, "status 5") ||
-			strings.Contains(errStr, "status 429")
-
-		if !isRetryable {
-			return "", "", err
-		}
-
-		GoLog("[Amazon] Attempt %d failed (retryable): %v\n", attempt+1, err)
+// GetAvailableAPIs returns list of available DoubleDouble regions
+// Uses same service as PC version (doubledouble.top)
+func (a *AmazonDownloader) GetAvailableAPIs() []string {
+	// DoubleDouble service regions (same as PC)
+	// Format: https://{region}.doubledouble.top
+	var apis []string
+	for _, region := range a.regions {
+		apis = append(apis, fmt.Sprintf("https://%s.doubledouble.top", region))
 	}
-
-	return "", "", fmt.Errorf("all %d attempts failed: %w", amazonMaxRetries+1, lastErr)
+	return apis
 }
 
-// doAfkarXYZRequest performs a single request to AfkarXYZ API
-func (a *AmazonDownloader) doAfkarXYZRequest(apiURL string) (string, string, error) {
-	ctx, cancel := context.WithTimeout(context.Background(), amazonAPITimeoutMobile)
-	defer cancel()
 
-	req, err := http.NewRequestWithContext(ctx, "GET", apiURL, nil)
-	if err != nil {
-		return "", "", fmt.Errorf("failed to create request: %w", err)
+// downloadFromDoubleDoubleService downloads a track using DoubleDouble service (same as PC)
+// This uses submit → poll → download mechanism
+// Internal function - not exported to gomobile
+func (a *AmazonDownloader) downloadFromDoubleDoubleService(amazonURL, outputDir string) (string, string, string, error) {
+	var lastError error
+
+	for _, region := range a.regions {
+		fmt.Printf("[Amazon] Trying region: %s...\n", region)
+
+		// Build base URL for DoubleDouble service
+		// Decode base64 service URL (same as PC)
+		serviceBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly8=")         // https://
+		serviceDomain, _ := base64.StdEncoding.DecodeString("LmRvdWJsZWRvdWJsZS50b3A=") // .doubledouble.top
+		baseURL := fmt.Sprintf("%s%s%s", string(serviceBase), region, string(serviceDomain))
+
+		// Step 1: Submit download request
+		encodedURL := url.QueryEscape(amazonURL)
+		submitURL := fmt.Sprintf("%s/dl?url=%s", baseURL, encodedURL)
+
+		req, err := http.NewRequest("GET", submitURL, nil)
+		if err != nil {
+			lastError = fmt.Errorf("failed to create request: %w", err)
+			continue
+		}
+
+		req.Header.Set("User-Agent", getRandomUserAgent())
+
+		fmt.Println("[Amazon] Submitting download request...")
+		resp, err := a.client.Do(req)
+		if err != nil {
+			lastError = fmt.Errorf("failed to submit request: %w", err)
+			continue
+		}
+
+		if resp.StatusCode != 200 {
+			resp.Body.Close()
+			lastError = fmt.Errorf("submit failed with status %d", resp.StatusCode)
+			continue
+		}
+
+		var submitResp DoubleDoubleSubmitResponse
+		if err := json.NewDecoder(resp.Body).Decode(&submitResp); err != nil {
+			resp.Body.Close()
+			lastError = fmt.Errorf("failed to decode submit response: %w", err)
+			continue
+		}
+		resp.Body.Close()
+
+		if !submitResp.Success || submitResp.ID == "" {
+			lastError = fmt.Errorf("submit request failed")
+			continue
+		}
+
+		downloadID := submitResp.ID
+		fmt.Printf("[Amazon] Download ID: %s\n", downloadID)
+
+		// Step 2: Poll for completion
+		statusURL := fmt.Sprintf("%s/dl/%s", baseURL, downloadID)
+		fmt.Println("[Amazon] Waiting for download to complete...")
+
+		maxWait := 300 * time.Second // 5 minutes max wait
+		elapsed := time.Duration(0)
+		pollInterval := 3 * time.Second
+
+		for elapsed < maxWait {
+			time.Sleep(pollInterval)
+			elapsed += pollInterval
+
+			statusReq, err := http.NewRequest("GET", statusURL, nil)
+			if err != nil {
+				continue
+			}
+
+			statusReq.Header.Set("User-Agent", getRandomUserAgent())
+
+			statusResp, err := a.client.Do(statusReq)
+			if err != nil {
+				fmt.Printf("\r[Amazon] Status check failed, retrying...")
+				continue
+			}
+
+			if statusResp.StatusCode != 200 {
+				statusResp.Body.Close()
+				fmt.Printf("\r[Amazon] Status check failed (status %d), retrying...", statusResp.StatusCode)
+				continue
+			}
+
+			var status DoubleDoubleStatusResponse
+			if err := json.NewDecoder(statusResp.Body).Decode(&status); err != nil {
+				statusResp.Body.Close()
+				fmt.Printf("\r[Amazon] Invalid JSON response, retrying...")
+				continue
+			}
+			statusResp.Body.Close()
+
+			if status.Status == "done" {
+				fmt.Println("\n[Amazon] Download ready!")
+
+				// Build download URL
+				fileURL := status.URL
+				if strings.HasPrefix(fileURL, "./") {
+					fileURL = fmt.Sprintf("%s/%s", baseURL, fileURL[2:])
+				} else if strings.HasPrefix(fileURL, "/") {
+					fileURL = fmt.Sprintf("%s%s", baseURL, fileURL)
+				}
+
+				trackName := status.Current.Name
+				artist := status.Current.Artist
+
+				fmt.Printf("[Amazon] Downloading: %s - %s\n", artist, trackName)
+				return fileURL, trackName, artist, nil
+
+			} else if status.Status == "error" {
+				errorMsg := status.FriendlyStatus
+				if errorMsg == "" {
+					errorMsg = "Unknown error"
+				}
+				lastError = fmt.Errorf("processing failed: %s", errorMsg)
+				break
+			} else {
+				// Still processing
+				friendlyStatus := status.FriendlyStatus
+				if friendlyStatus == "" {
+					friendlyStatus = status.Status
+				}
+				fmt.Printf("\r[Amazon] %s...", friendlyStatus)
+			}
+		}
+
+		if elapsed >= maxWait {
+			lastError = fmt.Errorf("download timeout")
+			fmt.Printf("\n[Amazon] Error with %s region: %v\n", region, lastError)
+			continue
+		}
+
+		if lastError != nil {
+			fmt.Printf("\n[Amazon] Error with %s region: %v\n", region, lastError)
+		}
 	}
 
-	req.Header.Set("User-Agent", getRandomUserAgent())
-
-	resp, err := a.client.Do(req)
-	if err != nil {
-		return "", "", fmt.Errorf("failed to call AfkarXYZ API: %w", err)
-	}
-	defer resp.Body.Close()
-
-	if resp.StatusCode != 200 {
-		return "", "", fmt.Errorf("AfkarXYZ API returned status %d", resp.StatusCode)
-	}
-
-	body, err := io.ReadAll(resp.Body)
-	if err != nil {
-		return "", "", fmt.Errorf("failed to read response: %w", err)
-	}
-
-	var apiResp AfkarXYZResponse
-	if err := json.Unmarshal(body, &apiResp); err != nil {
-		return "", "", fmt.Errorf("failed to decode response: %w", err)
-	}
-
-	if !apiResp.Success || apiResp.Data.DirectLink == "" {
-		return "", "", fmt.Errorf("AfkarXYZ API failed or no download link found")
-	}
-
-	fileName := apiResp.Data.FileName
-	if fileName == "" {
-		fileName = "track.flac"
-	}
-
-	reg := regexp.MustCompile(`[<>:"/\\|?*]`)
-	fileName = reg.ReplaceAllString(fileName, "")
-
-	return apiResp.Data.DirectLink, fileName, nil
+	return "", "", "", fmt.Errorf("all regions failed. Last error: %v", lastError)
 }
 
-func (a *AmazonDownloader) downloadFromAfkarXYZ(amazonURL string) (string, string, error) {
-	GoLog("[Amazon] Fetching from AfkarXYZ API...\n")
 
-	downloadURL, fileName, err := a.fetchAmazonURLWithRetry(amazonURL)
-	if err != nil {
-		return "", "", err
-	}
+// DownloadFile downloads a file from URL with User-Agent and progress tracking
+func (a *AmazonDownloader) DownloadFile(downloadURL, outputPath string) error {
+	// Set current file being downloaded
+	SetCurrentFile(filepath.Base(outputPath))
+	SetDownloading(true)
+	defer SetDownloading(false)
 
-	GoLog("[Amazon] AfkarXYZ returned: %s\n", fileName)
-	return downloadURL, fileName, nil
-}
-
-func (a *AmazonDownloader) DownloadFile(downloadURL, outputPath string, outputFD int, itemID string) error {
-	ctx := context.Background()
-
-	if itemID != "" {
-		StartItemProgress(itemID)
-		defer CompleteItemProgress(itemID)
-		ctx = initDownloadCancel(itemID)
-		defer clearDownloadCancel(itemID)
-	}
-
-	if isDownloadCancelled(itemID) {
-		return ErrDownloadCancelled
-	}
-
-	req, err := http.NewRequestWithContext(ctx, "GET", downloadURL, nil)
+	req, err := http.NewRequest("GET", downloadURL, nil)
 	if err != nil {
 		return fmt.Errorf("failed to create request: %w", err)
 	}
@@ -172,9 +217,6 @@ func (a *AmazonDownloader) DownloadFile(downloadURL, outputPath string, outputFD
 
 	resp, err := a.client.Do(req)
 	if err != nil {
-		if isDownloadCancelled(itemID) {
-			return ErrDownloadCancelled
-		}
 		return err
 	}
 	defer resp.Body.Close()
@@ -183,130 +225,64 @@ func (a *AmazonDownloader) DownloadFile(downloadURL, outputPath string, outputFD
 		return fmt.Errorf("download failed: HTTP %d", resp.StatusCode)
 	}
 
-	expectedSize := resp.ContentLength
-	if expectedSize > 0 && itemID != "" {
-		SetItemBytesTotal(itemID, expectedSize)
+	// Set total bytes if available
+	if resp.ContentLength > 0 {
+		SetBytesTotal(resp.ContentLength)
 	}
 
-	out, err := openOutputForWrite(outputPath, outputFD)
+	out, err := os.Create(outputPath)
 	if err != nil {
 		return err
 	}
+	defer out.Close()
 
-	bufWriter := bufio.NewWriterSize(out, 256*1024)
-
-	var written int64
-	if itemID != "" {
-		pw := NewItemProgressWriter(bufWriter, itemID)
-		written, err = io.Copy(pw, resp.Body)
-	} else {
-		written, err = io.Copy(bufWriter, resp.Body)
-	}
-
-	flushErr := bufWriter.Flush()
-	closeErr := out.Close()
-
+	// Track download progress
+	pw := NewProgressWriter(out)
+	_, err = io.Copy(pw, resp.Body)
 	if err != nil {
-		cleanupOutputOnError(outputPath, outputFD)
-		if isDownloadCancelled(itemID) {
-			return ErrDownloadCancelled
-		}
-		return fmt.Errorf("download interrupted: %w", err)
-	}
-	if flushErr != nil {
-		cleanupOutputOnError(outputPath, outputFD)
-		return fmt.Errorf("failed to flush buffer: %w", flushErr)
-	}
-	if closeErr != nil {
-		cleanupOutputOnError(outputPath, outputFD)
-		return fmt.Errorf("failed to close file: %w", closeErr)
+		return fmt.Errorf("failed to write file: %w", err)
 	}
 
-	if expectedSize > 0 && written != expectedSize {
-		cleanupOutputOnError(outputPath, outputFD)
-		return fmt.Errorf("incomplete download: expected %d bytes, got %d bytes", expectedSize, written)
-	}
-
-	GoLog("[Amazon] Downloaded: %.2f MB (Complete)\n", float64(written)/(1024*1024))
+	fmt.Printf("\r[Amazon] Downloaded: %.2f MB (Complete)\n", float64(pw.GetTotal())/(1024*1024))
 	return nil
 }
 
-// AmazonDownloadResult contains download result with quality info
-type AmazonDownloadResult struct {
-	FilePath    string
-	BitDepth    int
-	SampleRate  int
-	Title       string
-	Artist      string
-	Album       string
-	ReleaseDate string
-	TrackNumber int
-	DiscNumber  int
-	ISRC        string
-	LyricsLRC   string
-}
-
-func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
+// downloadFromAmazon downloads a track using the request parameters
+// Uses DoubleDouble service (same as PC version)
+func downloadFromAmazon(req DownloadRequest) (string, error) {
 	downloader := NewAmazonDownloader()
 
-	isSafOutput := isFDOutput(req.OutputFD) || strings.TrimSpace(req.OutputPath) != ""
-	if !isSafOutput {
-		if existingFile, exists := checkISRCExistsInternal(req.OutputDir, req.ISRC); exists {
-			return AmazonDownloadResult{FilePath: "EXISTS:" + existingFile}, nil
-		}
-	}
-
-	amazonURL := ""
-	if req.ISRC != "" {
-		if cached := GetTrackIDCache().Get(req.ISRC); cached != nil && cached.AmazonURL != "" {
-			amazonURL = cached.AmazonURL
-			GoLog("[Amazon] Cache hit! Using cached Amazon URL for ISRC %s\n", req.ISRC)
-		}
+	// Check for existing file first
+	if existingFile, exists := checkISRCExistsInternal(req.OutputDir, req.ISRC); exists {
+		return "EXISTS:" + existingFile, nil
 	}
 
+	// Get Amazon URL from SongLink
 	songlink := NewSongLinkClient()
-	var availability *TrackAvailability
-	var err error
-
-	if amazonURL == "" {
-		if deezerID, found := strings.CutPrefix(req.SpotifyID, "deezer:"); found {
-			GoLog("[Amazon] Using Deezer ID for SongLink lookup: %s\n", deezerID)
-			availability, err = songlink.CheckAvailabilityFromDeezer(deezerID)
-		} else if req.SpotifyID != "" {
-			availability, err = songlink.CheckTrackAvailability(req.SpotifyID, req.ISRC)
-		} else {
-			return AmazonDownloadResult{}, fmt.Errorf("no valid Spotify or Deezer ID provided for Amazon lookup")
-		}
-
-		if err != nil {
-			return AmazonDownloadResult{}, fmt.Errorf("failed to check Amazon availability via SongLink: %w", err)
-		}
-
-		if !availability.Amazon || availability.AmazonURL == "" {
-			return AmazonDownloadResult{}, fmt.Errorf("track not available on Amazon Music (SongLink returned no Amazon URL)")
-		}
-
-		amazonURL = availability.AmazonURL
-		if req.ISRC != "" {
-			GetTrackIDCache().SetAmazonURL(req.ISRC, amazonURL)
-		}
-	}
-
-	if !isSafOutput && req.OutputDir != "." {
-		if err := os.MkdirAll(req.OutputDir, 0755); err != nil {
-			return AmazonDownloadResult{}, fmt.Errorf("failed to create output directory: %w", err)
-		}
-	}
-
-	// Download using AfkarXYZ API
-	downloadURL, _, err := downloader.downloadFromAfkarXYZ(amazonURL)
+	availability, err := songlink.CheckTrackAvailability(req.SpotifyID, req.ISRC)
 	if err != nil {
-		return AmazonDownloadResult{}, fmt.Errorf("failed to get download URL from AfkarXYZ: %w", err)
+		return "", fmt.Errorf("failed to check Amazon availability via SongLink: %w", err)
 	}
 
-	GoLog("[Amazon] Match found: '%s' by '%s'\n", req.TrackName, req.ArtistName)
+	if !availability.Amazon || availability.AmazonURL == "" {
+		return "", fmt.Errorf("track not available on Amazon Music (SongLink returned no Amazon URL)")
+	}
 
-	filename := buildFilenameFromTemplate(req.FilenameFormat, map[string]any{
+	// Create output directory if needed
+	if req.OutputDir != "." {
+		if err := os.MkdirAll(req.OutputDir, 0755); err != nil {
+			return "", fmt.Errorf("failed to create output directory: %w", err)
+		}
+	}
+
+	// Download using DoubleDouble service (same as PC)
+	downloadURL, trackName, artistName, err := downloader.downloadFromDoubleDoubleService(availability.AmazonURL, req.OutputDir)
+	if err != nil {
+		return "", fmt.Errorf("failed to get download URL: %w", err)
+	}
+
+	// Build filename using Spotify metadata (more accurate)
+	filename := buildFilenameFromTemplate(req.FilenameFormat, map[string]interface{}{
 		"title":  req.TrackName,
 		"artist": req.ArtistName,
 		"album":  req.AlbumName,
@@ -314,198 +290,74 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 		"year":   extractYear(req.ReleaseDate),
 		"disc":   req.DiscNumber,
 	})
-	var outputPath string
-	if isSafOutput {
-		outputPath = strings.TrimSpace(req.OutputPath)
-		if outputPath == "" && isFDOutput(req.OutputFD) {
-			outputPath = fmt.Sprintf("/proc/self/fd/%d", req.OutputFD)
-		}
-	} else {
-		filename = sanitizeFilename(filename) + ".flac"
-		outputPath = filepath.Join(req.OutputDir, filename)
-		if fileInfo, statErr := os.Stat(outputPath); statErr == nil && fileInfo.Size() > 0 {
-			return AmazonDownloadResult{FilePath: "EXISTS:" + outputPath}, nil
-		}
+	filename = sanitizeFilename(filename) + ".flac"
+	outputPath := filepath.Join(req.OutputDir, filename)
+
+	// Check if file already exists
+	if fileInfo, statErr := os.Stat(outputPath); statErr == nil && fileInfo.Size() > 0 {
+		return "EXISTS:" + outputPath, nil
 	}
 
-	// START PARALLEL: Fetch cover and lyrics while downloading audio
-	var parallelResult *ParallelDownloadResult
-	parallelDone := make(chan struct{})
-	go func() {
-		defer close(parallelDone)
-		parallelResult = FetchCoverAndLyricsParallel(
-			req.CoverURL,
-			req.EmbedMaxQualityCover,
-			req.SpotifyID,
-			req.TrackName,
-			req.ArtistName,
-			req.EmbedLyrics,
-			int64(req.DurationMS),
-		)
-	}()
-
-	// Download audio file with item ID for progress tracking
-	if err := downloader.DownloadFile(downloadURL, outputPath, req.OutputFD, req.ItemID); err != nil {
-		if errors.Is(err, ErrDownloadCancelled) {
-			return AmazonDownloadResult{}, ErrDownloadCancelled
-		}
-		return AmazonDownloadResult{}, fmt.Errorf("download failed: %w", err)
+	// Download file
+	if err := downloader.DownloadFile(downloadURL, outputPath); err != nil {
+		return "", fmt.Errorf("download failed: %w", err)
 	}
 
-	// Wait for parallel operations to complete
-	<-parallelDone
-
-	if req.ItemID != "" {
-		SetItemProgress(req.ItemID, 1.0, 0, 0)
-		SetItemFinalizing(req.ItemID)
-	}
-
-	existingMeta, metaErr := ReadMetadata(outputPath)
-	actualTrackNum := req.TrackNumber
-	actualDiscNum := req.DiscNumber
-	actualDate := req.ReleaseDate
-	actualAlbum := req.AlbumName
-	actualTitle := req.TrackName
-	actualArtist := req.ArtistName
-
-	if metaErr == nil && existingMeta != nil {
-		if existingMeta.TrackNumber > 0 && (req.TrackNumber == 0 || req.TrackNumber == 1) {
-			actualTrackNum = existingMeta.TrackNumber
-			GoLog("[Amazon] Using track number from file: %d (request had: %d)\n", actualTrackNum, req.TrackNumber)
-		}
-		if existingMeta.DiscNumber > 0 && (req.DiscNumber == 0 || req.DiscNumber == 1) {
-			actualDiscNum = existingMeta.DiscNumber
-			GoLog("[Amazon] Using disc number from file: %d (request had: %d)\n", actualDiscNum, req.DiscNumber)
-		}
-		if existingMeta.Date != "" && req.ReleaseDate == "" {
-			actualDate = existingMeta.Date
-			GoLog("[Amazon] Using release date from file: %s\n", actualDate)
-		}
-		if existingMeta.Album != "" && req.AlbumName == "" {
-			actualAlbum = existingMeta.Album
-			GoLog("[Amazon] Using album from file: %s\n", actualAlbum)
-		}
-		GoLog("[Amazon] Existing metadata - Title: %s, Artist: %s, Album: %s, Date: %s\n",
-			existingMeta.Title, existingMeta.Artist, existingMeta.Album, existingMeta.Date)
+	// Log track info from DoubleDouble (for debugging)
+	if trackName != "" && artistName != "" {
+		fmt.Printf("[Amazon] DoubleDouble returned: %s - %s\n", artistName, trackName)
 	}
 
+	// Embed metadata using Spotify data (more accurate than DoubleDouble)
 	metadata := Metadata{
-		Title:       actualTitle,
-		Artist:      actualArtist,
-		Album:       actualAlbum,
-		AlbumArtist: req.AlbumArtist,
-		Date:        actualDate,
-		TrackNumber: actualTrackNum,
-		TotalTracks: req.TotalTracks,
-		DiscNumber:  actualDiscNum,
-		ISRC:        req.ISRC,
-		Genre:       req.Genre,
-		Label:       req.Label,
-		Copyright:   req.Copyright,
-	}
-
-	var coverData []byte
-	if parallelResult != nil && parallelResult.CoverData != nil && len(parallelResult.CoverData) > 0 {
-		coverData = parallelResult.CoverData
-		GoLog("[Amazon] Using parallel-fetched cover (%d bytes)\n", len(coverData))
-	} else {
-		existingCover, coverErr := ExtractCoverArt(outputPath)
-		if coverErr == nil && len(existingCover) > 0 {
-			coverData = existingCover
-			GoLog("[Amazon] Using existing cover from Amazon file (%d bytes)\n", len(coverData))
-		} else {
-			GoLog("[Amazon] No cover available (parallel fetch failed and no existing cover)\n")
-		}
-	}
-
-	if isSafOutput {
-		GoLog("[Amazon] SAF output detected - skipping in-backend metadata/lyrics embedding (handled in Flutter)\n")
-	} else {
-		if err := EmbedMetadataWithCoverData(outputPath, metadata, coverData); err != nil {
-			GoLog("[Amazon] Warning: failed to embed metadata: %v\n", err)
-		}
-
-		if req.EmbedLyrics && parallelResult != nil && parallelResult.LyricsLRC != "" {
-			lyricsMode := req.LyricsMode
-			if lyricsMode == "" {
-				lyricsMode = "embed"
-			}
-
-			if lyricsMode == "external" || lyricsMode == "both" {
-				GoLog("[Amazon] Saving external LRC file...\n")
-				if lrcPath, lrcErr := SaveLRCFile(outputPath, parallelResult.LyricsLRC); lrcErr != nil {
-					GoLog("[Amazon] Warning: failed to save LRC file: %v\n", lrcErr)
-				} else {
-					GoLog("[Amazon] LRC file saved: %s\n", lrcPath)
-				}
-			}
-
-			if lyricsMode == "embed" || lyricsMode == "both" {
-				GoLog("[Amazon] Embedding parallel-fetched lyrics (%d lines)...\n", len(parallelResult.LyricsData.Lines))
-				if embedErr := EmbedLyrics(outputPath, parallelResult.LyricsLRC); embedErr != nil {
-					GoLog("[Amazon] Warning: failed to embed lyrics: %v\n", embedErr)
-				} else {
-					GoLog("[Amazon] Lyrics embedded successfully\n")
-				}
-			}
-		} else if req.EmbedLyrics {
-			GoLog("[Amazon] No lyrics available from parallel fetch\n")
-		}
-	}
-
-	GoLog("[Amazon] Downloaded successfully from Amazon Music\n")
-
-	quality := AudioQuality{}
-	if isSafOutput {
-		GoLog("[Amazon] SAF output detected - skipping post-write file inspection in backend\n")
-	} else {
-		quality, err = GetAudioQuality(outputPath)
-		if err != nil {
-			GoLog("[Amazon] Warning: couldn't read quality from file: %v\n", err)
-		} else {
-			GoLog("[Amazon] Actual quality: %d-bit/%dHz\n", quality.BitDepth, quality.SampleRate)
-		}
-
-		finalMeta, metaReadErr := ReadMetadata(outputPath)
-		if metaReadErr == nil && finalMeta != nil {
-			GoLog("[Amazon] Final metadata from file - Track: %d, Disc: %d, Date: %s\n",
-				finalMeta.TrackNumber, finalMeta.DiscNumber, finalMeta.Date)
-			actualTrackNum = finalMeta.TrackNumber
-			actualDiscNum = finalMeta.DiscNumber
-			if finalMeta.Date != "" {
-				req.ReleaseDate = finalMeta.Date
-			}
-		}
-	}
-
-	// Add to ISRC index for fast duplicate checking
-	if !isSafOutput {
-		AddToISRCIndex(req.OutputDir, req.ISRC, outputPath)
-	}
-
-	bitDepth := 0
-	sampleRate := 0
-	if err == nil {
-		bitDepth = quality.BitDepth
-		sampleRate = quality.SampleRate
-	}
-
-	lyricsLRC := ""
-	if req.EmbedLyrics && parallelResult != nil && parallelResult.LyricsLRC != "" {
-		lyricsLRC = parallelResult.LyricsLRC
-	}
-
-	return AmazonDownloadResult{
-		FilePath:    outputPath,
-		BitDepth:    bitDepth,
-		SampleRate:  sampleRate,
 		Title:       req.TrackName,
 		Artist:      req.ArtistName,
 		Album:       req.AlbumName,
-		ReleaseDate: req.ReleaseDate,
-		TrackNumber: actualTrackNum,
-		DiscNumber:  actualDiscNum,
+		AlbumArtist: req.AlbumArtist,
+		Date:        req.ReleaseDate,
+		TrackNumber: req.TrackNumber,
+		TotalTracks: req.TotalTracks,
+		DiscNumber:  req.DiscNumber,
 		ISRC:        req.ISRC,
-		LyricsLRC:   lyricsLRC,
-	}, nil
+	}
+
+	// Download cover to memory (avoids file permission issues on Android)
+	var coverData []byte
+	if req.CoverURL != "" {
+		fmt.Println("[Amazon] Downloading cover to memory...")
+		data, err := downloadCoverToMemory(req.CoverURL, req.EmbedMaxQualityCover)
+		if err == nil {
+			coverData = data
+			fmt.Printf("[Amazon] Cover downloaded successfully (%d bytes)\n", len(coverData))
+		} else {
+			fmt.Printf("[Amazon] Warning: failed to download cover: %v\n", err)
+		}
+	}
+
+	if err := EmbedMetadataWithCoverData(outputPath, metadata, coverData); err != nil {
+		fmt.Printf("Warning: failed to embed metadata: %v\n", err)
+	}
+
+	// Embed lyrics if enabled
+	if req.EmbedLyrics {
+		fmt.Println("[Amazon] Fetching lyrics...")
+		lyricsClient := NewLyricsClient()
+		lyrics, lyricsErr := lyricsClient.FetchLyricsAllSources(req.SpotifyID, req.TrackName, req.ArtistName)
+		if lyricsErr != nil {
+			fmt.Printf("[Amazon] Warning: lyrics fetch error: %v\n", lyricsErr)
+		} else if lyrics == nil || len(lyrics.Lines) == 0 {
+			fmt.Println("[Amazon] No lyrics found for this track")
+		} else {
+			fmt.Printf("[Amazon] Lyrics found (%d lines), embedding...\n", len(lyrics.Lines))
+			lrcContent := convertToLRC(lyrics)
+			if embedErr := EmbedLyrics(outputPath, lrcContent); embedErr != nil {
+				fmt.Printf("[Amazon] Warning: failed to embed lyrics: %v\n", embedErr)
+			} else {
+				fmt.Println("[Amazon] Lyrics embedded successfully")
+			}
+		}
+	}
+
+	fmt.Println("[Amazon] ✓ Downloaded successfully from Amazon Music")
+	return outputPath, nil
 }

go_backend/cancel.go

@@ -1,78 +0,0 @@
-package gobackend
-
-import (
-	"context"
-	"errors"
-	"sync"
-)
-
-// ErrDownloadCancelled is returned when a download is cancelled by the user.
-var ErrDownloadCancelled = errors.New("download cancelled")
-
-type cancelEntry struct {
-	cancel   context.CancelFunc
-	canceled bool
-}
-
-var (
-	cancelMu  sync.Mutex
-	cancelMap = make(map[string]*cancelEntry)
-)
-
-func initDownloadCancel(itemID string) context.Context {
-	if itemID == "" {
-		return context.Background()
-	}
-
-	cancelMu.Lock()
-	defer cancelMu.Unlock()
-
-	ctx, cancel := context.WithCancel(context.Background())
-	cancelMap[itemID] = &cancelEntry{
-		cancel:   cancel,
-		canceled: false,
-	}
-	return ctx
-}
-
-func cancelDownload(itemID string) {
-	if itemID == "" {
-		return
-	}
-
-	cancelMu.Lock()
-	entry, ok := cancelMap[itemID]
-	if ok {
-		entry.canceled = true
-		if entry.cancel != nil {
-			entry.cancel()
-		}
-	} else {
-		cancelMap[itemID] = &cancelEntry{canceled: true}
-	}
-	cancelMu.Unlock()
-
-	RemoveItemProgress(itemID)
-}
-
-func isDownloadCancelled(itemID string) bool {
-	if itemID == "" {
-		return false
-	}
-
-	cancelMu.Lock()
-	entry, ok := cancelMap[itemID]
-	canceled := ok && entry.canceled
-	cancelMu.Unlock()
-	return canceled
-}
-
-func clearDownloadCancel(itemID string) {
-	if itemID == "" {
-		return
-	}
-
-	cancelMu.Lock()
-	delete(cancelMap, itemID)
-	cancelMu.Unlock()
-}

go_backend/cover.go

@@ -4,53 +4,36 @@ import (
 	"fmt"
 	"io"
 	"net/http"
-	"regexp"
 	"strings"
 )
 
+// Spotify image size codes (same as PC version)
 const (
-	spotifySize300 = "ab67616d00001e02"
-	spotifySize640 = "ab67616d0000b273"
-	spotifySizeMax = "ab67616d000082c1"
+	spotifySize640 = "ab67616d0000b273" // 640x640
+	spotifySizeMax = "ab67616d000082c1" // Max resolution (~2000x2000)
 )
 
-// Deezer CDN supports these sizes: 56, 250, 500, 1000, 1400, 1800
-var deezerSizeRegex = regexp.MustCompile(`/(\d+)x(\d+)-\d+-\d+-\d+-\d+\.jpg$`)
-
-func convertSmallToMedium(imageURL string) string {
-	if strings.Contains(imageURL, spotifySize300) {
-		return strings.Replace(imageURL, spotifySize300, spotifySize640, 1)
-	}
-	return imageURL
-}
-
+// downloadCoverToMemory downloads cover art and returns as bytes (no file creation)
+// This avoids file permission issues on Android
 func downloadCoverToMemory(coverURL string, maxQuality bool) ([]byte, error) {
 	if coverURL == "" {
 		return nil, fmt.Errorf("no cover URL provided")
 	}
 
-	GoLog("[Cover] Original URL: %s", coverURL)
-
-	downloadURL := convertSmallToMedium(coverURL)
-	if downloadURL != coverURL {
-		GoLog("[Cover] Upgraded 300x300 → 640x640")
-	}
+	fmt.Printf("[Cover] Downloading cover from: %s\n", coverURL)
 
+	// Upgrade to max quality if requested
+	downloadURL := coverURL
 	if maxQuality {
-		maxURL := upgradeToMaxQuality(downloadURL)
-		if maxURL != downloadURL {
-			downloadURL = maxURL
-			// Log already printed by upgradeToMaxQuality for Deezer
-			if strings.Contains(coverURL, "scdn.co") || strings.Contains(coverURL, "spotifycdn") {
-				GoLog("[Cover] Spotify: upgraded to max resolution (~2000x2000)")
-			}
+		downloadURL = upgradeToMaxQuality(coverURL)
+		if downloadURL != coverURL {
+			fmt.Printf("[Cover] Upgraded to max quality URL: %s\n", downloadURL)
 		}
 	}
 
-	GoLog("[Cover] Final URL: %s", downloadURL)
-
 	client := NewHTTPClientWithTimeout(DefaultTimeout)
 
+	// Create request with User-Agent (required by Spotify CDN)
 	req, err := http.NewRequest("GET", downloadURL, nil)
 	if err != nil {
 		return nil, fmt.Errorf("failed to create request: %w", err)
@@ -71,58 +54,48 @@ func downloadCoverToMemory(coverURL string, maxQuality bool) ([]byte, error) {
 		return nil, fmt.Errorf("failed to read cover data: %w", err)
 	}
 
-	sizeKB := len(data) / 1024
-	var resolution string
-	if sizeKB > 200 {
-		resolution = "~2000x2000 (hi-res)"
-	} else if sizeKB > 50 {
-		resolution = "~640x640"
-	} else {
-		resolution = "~300x300"
-	}
-	GoLog("[Cover] Downloaded %d KB (%s)", sizeKB, resolution)
-
+	fmt.Printf("[Cover] Downloaded %d bytes\n", len(data))
 	return data, nil
 }
 
+// upgradeToMaxQuality upgrades Spotify cover URL to maximum quality
+// Uses same logic as PC version - replaces 640x640 size code with max resolution
 func upgradeToMaxQuality(coverURL string) string {
-	// Spotify CDN upgrade
-	if strings.Contains(coverURL, spotifySize640) {
-		return strings.Replace(coverURL, spotifySize640, spotifySizeMax, 1)
-	}
+	// Spotify image URLs can be upgraded by changing the size parameter
+	// Format: https://i.scdn.co/image/ab67616d0000b273...
+	// ab67616d0000b273 = 640x640
+	// ab67616d000082c1 = Max resolution (~2000x2000)
 
-	// Deezer CDN upgrade
-	if strings.Contains(coverURL, "cdn-images.dzcdn.net") {
-		return upgradeDeezerCover(coverURL)
+	if strings.Contains(coverURL, spotifySize640) {
+		// Try max resolution first
+		maxURL := strings.Replace(coverURL, spotifySize640, spotifySizeMax, 1)
+
+		// Verify max resolution URL is available
+		client := NewHTTPClientWithTimeout(DefaultTimeout)
+		req, err := http.NewRequest("HEAD", maxURL, nil)
+		if err == nil {
+			resp, err := DoRequestWithUserAgent(client, req)
+			if err == nil {
+				resp.Body.Close()
+				if resp.StatusCode == http.StatusOK {
+					return maxURL
+				}
+			}
+		}
 	}
 
 	return coverURL
 }
 
-func upgradeDeezerCover(coverURL string) string {
-	if !strings.Contains(coverURL, "cdn-images.dzcdn.net") {
-		return coverURL
-	}
-
-	// Replace any size pattern with 1800x1800
-	upgraded := deezerSizeRegex.ReplaceAllString(coverURL, "/1800x1800-000000-80-0-0.jpg")
-	if upgraded != coverURL {
-		GoLog("[Cover] Deezer: upgraded to 1800x1800")
-	}
-	return upgraded
-}
-
+// GetCoverFromSpotify gets cover URL from Spotify metadata
 func GetCoverFromSpotify(imageURL string, maxQuality bool) string {
 	if imageURL == "" {
 		return ""
 	}
 
-	// Always upgrade small to medium first
-	result := convertSmallToMedium(imageURL)
-
 	if maxQuality {
-		result = upgradeToMaxQuality(result)
+		return upgradeToMaxQuality(imageURL)
 	}
 
-	return result
+	return imageURL
 }

go_backend/duplicate.go

@@ -1,172 +1,59 @@
 package gobackend
 
 import (
-	"encoding/json"
-	"fmt"
 	"os"
 	"path/filepath"
 	"strings"
-	"sync"
-	"time"
 )
 
-type ISRCIndex struct {
-	index     map[string]string // ISRC (uppercase) -> file path
-	outputDir string
-	buildTime time.Time
-	mu        sync.RWMutex
-}
-
-var (
-	isrcIndexCache   = make(map[string]*ISRCIndex)
-	isrcIndexCacheMu sync.RWMutex
-	isrcBuildingMu   sync.Map // Per-directory build lock to prevent concurrent builds
-	isrcIndexTTL     = 5 * time.Minute
-)
-
-func GetISRCIndex(outputDir string) *ISRCIndex {
-	// Fast path: check cache first
-	isrcIndexCacheMu.RLock()
-	idx, exists := isrcIndexCache[outputDir]
-	isrcIndexCacheMu.RUnlock()
-
-	if exists && time.Since(idx.buildTime) < isrcIndexTTL {
-		return idx
-	}
-
-	// Slow path: need to build index
-	// Use per-directory mutex to prevent multiple goroutines from building simultaneously
-	buildLock, _ := isrcBuildingMu.LoadOrStore(outputDir, &sync.Mutex{})
-	mu := buildLock.(*sync.Mutex)
-	mu.Lock()
-	defer mu.Unlock()
-
-	// Double-check cache after acquiring lock (another goroutine may have built it)
-	isrcIndexCacheMu.RLock()
-	idx, exists = isrcIndexCache[outputDir]
-	isrcIndexCacheMu.RUnlock()
-
-	if exists && time.Since(idx.buildTime) < isrcIndexTTL {
-		return idx
-	}
-
-	return buildISRCIndex(outputDir)
-}
-
-func buildISRCIndex(outputDir string) *ISRCIndex {
-	idx := &ISRCIndex{
-		index:     make(map[string]string),
-		outputDir: outputDir,
-		buildTime: time.Now(),
-	}
-
-	if outputDir == "" {
-		return idx
-	}
-
-	startTime := time.Now()
-	fileCount := 0
-
-	filepath.Walk(outputDir, func(path string, info os.FileInfo, err error) error {
-		if err != nil || info.IsDir() {
-			return nil
-		}
-
-		ext := strings.ToLower(filepath.Ext(path))
-		if ext != ".flac" {
-			return nil
-		}
-
-		metadata, err := ReadMetadata(path)
-		if err != nil || metadata.ISRC == "" {
-			return nil
-		}
-
-		idx.index[strings.ToUpper(metadata.ISRC)] = path
-		fileCount++
-		return nil
-	})
-
-	fmt.Printf("[ISRCIndex] Built index for %s: %d files in %v\n",
-		outputDir, fileCount, time.Since(startTime).Round(time.Millisecond))
-
-	isrcIndexCacheMu.Lock()
-	isrcIndexCache[outputDir] = idx
-	isrcIndexCacheMu.Unlock()
-
-	return idx
-}
-
-func (idx *ISRCIndex) lookup(isrc string) (string, bool) {
-	if isrc == "" {
-		return "", false
-	}
-
-	idx.mu.RLock()
-	defer idx.mu.RUnlock()
-
-	path, exists := idx.index[strings.ToUpper(isrc)]
-	return path, exists
-}
-
-func (idx *ISRCIndex) remove(isrc string) {
-	if isrc == "" {
-		return
-	}
-
-	idx.mu.Lock()
-	defer idx.mu.Unlock()
-
-	delete(idx.index, strings.ToUpper(isrc))
-}
-
-func (idx *ISRCIndex) Lookup(isrc string) (string, error) {
-	path, _ := idx.lookup(isrc)
-	return path, nil
-}
-
-func (idx *ISRCIndex) Add(isrc, filePath string) {
-	if isrc == "" || filePath == "" {
-		return
-	}
-
-	idx.mu.Lock()
-	defer idx.mu.Unlock()
-
-	idx.index[strings.ToUpper(isrc)] = filePath
-}
-
-func InvalidateISRCCache(outputDir string) {
-	isrcIndexCacheMu.Lock()
-	delete(isrcIndexCache, outputDir)
-	isrcIndexCacheMu.Unlock()
-}
-
+// checkISRCExistsInternal checks if a file with the given ISRC exists (internal use)
 func checkISRCExistsInternal(outputDir, isrc string) (string, bool) {
 	if isrc == "" || outputDir == "" {
 		return "", false
 	}
 
-	idx := GetISRCIndex(outputDir)
-	filePath, exists := idx.lookup(isrc)
-	if !exists {
-		return "", false
+	// Walk through directory looking for FLAC files
+	var foundFile string
+	filepath.Walk(outputDir, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return nil
+		}
+
+		// Only check FLAC files
+		if info.IsDir() || !strings.HasSuffix(strings.ToLower(path), ".flac") {
+			return nil
+		}
+
+		// Read metadata from file
+		metadata, err := ReadMetadata(path)
+		if err != nil {
+			return nil
+		}
+
+		// Check if ISRC matches
+		if metadata.ISRC == isrc {
+			foundFile = path
+			return filepath.SkipAll // Stop walking
+		}
+
+		return nil
+	})
+
+	if foundFile != "" {
+		return foundFile, true
 	}
 
-	if !CheckFileExists(filePath) {
-		// Stale index entry; remove it and return not found.
-		idx.remove(isrc)
-		return "", false
-	}
-
-	return filePath, true
+	return "", false
 }
 
+// CheckISRCExists is the exported version for gomobile (returns string, error)
+// Returns the filepath if exists, empty string if not
 func CheckISRCExists(outputDir, isrc string) (string, error) {
 	filepath, _ := checkISRCExistsInternal(outputDir, isrc)
 	return filepath, nil
 }
 
+// CheckFileExists checks if a file with the given name exists
 func CheckFileExists(filePath string) bool {
 	info, err := os.Stat(filePath)
 	if err != nil {
@@ -174,86 +61,3 @@ func CheckFileExists(filePath string) bool {
 	}
 	return !info.IsDir() && info.Size() > 0
 }
-
-type FileExistenceResult struct {
-	ISRC       string `json:"isrc"`
-	Exists     bool   `json:"exists"`
-	FilePath   string `json:"file_path,omitempty"`
-	TrackName  string `json:"track_name,omitempty"`
-	ArtistName string `json:"artist_name,omitempty"`
-}
-
-func CheckFilesExistParallel(outputDir string, tracksJSON string) (string, error) {
-	var tracks []struct {
-		ISRC       string `json:"isrc"`
-		TrackName  string `json:"track_name"`
-		ArtistName string `json:"artist_name"`
-	}
-	if err := json.Unmarshal([]byte(tracksJSON), &tracks); err != nil {
-		return "", fmt.Errorf("failed to parse tracks JSON: %w", err)
-	}
-
-	results := make([]FileExistenceResult, len(tracks))
-
-	isrcIdx := GetISRCIndex(outputDir)
-
-	var wg sync.WaitGroup
-	for i, track := range tracks {
-		wg.Add(1)
-		go func(resultIdx int, t struct {
-			ISRC       string `json:"isrc"`
-			TrackName  string `json:"track_name"`
-			ArtistName string `json:"artist_name"`
-		}) {
-			defer wg.Done()
-
-			result := FileExistenceResult{
-				ISRC:       t.ISRC,
-				TrackName:  t.TrackName,
-				ArtistName: t.ArtistName,
-				Exists:     false,
-			}
-
-			if t.ISRC != "" {
-				if filePath, exists := isrcIdx.lookup(t.ISRC); exists {
-					result.Exists = true
-					result.FilePath = filePath
-				}
-			}
-
-			results[resultIdx] = result
-		}(i, track)
-	}
-
-	wg.Wait()
-
-	resultJSON, err := json.Marshal(results)
-	if err != nil {
-		return "", fmt.Errorf("failed to marshal results: %w", err)
-	}
-
-	return string(resultJSON), nil
-}
-
-func PreBuildISRCIndex(outputDir string) error {
-	if outputDir == "" {
-		return fmt.Errorf("output directory is required")
-	}
-
-	buildISRCIndex(outputDir)
-	return nil
-}
-
-func AddToISRCIndex(outputDir, isrc, filePath string) {
-	if outputDir == "" || isrc == "" || filePath == "" {
-		return
-	}
-
-	isrcIndexCacheMu.RLock()
-	idx, exists := isrcIndexCache[outputDir]
-	isrcIndexCacheMu.RUnlock()
-
-	if exists {
-		idx.Add(isrc, filePath)
-	}
-}

go_backend/extension_manager.go

@@ -1,970 +0,0 @@
-package gobackend
-
-import (
-	"archive/zip"
-	"encoding/json"
-	"fmt"
-	"io"
-	"os"
-	"path/filepath"
-	"strconv"
-	"strings"
-	"sync"
-
-	"github.com/dop251/goja"
-)
-
-func compareVersions(v1, v2 string) int {
-	parts1 := strings.Split(strings.TrimPrefix(v1, "v"), ".")
-	parts2 := strings.Split(strings.TrimPrefix(v2, "v"), ".")
-
-	maxLen := len(parts1)
-	if len(parts2) > maxLen {
-		maxLen = len(parts2)
-	}
-
-	for i := 0; i < maxLen; i++ {
-		var n1, n2 int
-		if i < len(parts1) {
-			n1, _ = strconv.Atoi(parts1[i])
-		}
-		if i < len(parts2) {
-			n2, _ = strconv.Atoi(parts2[i])
-		}
-
-		if n1 < n2 {
-			return -1
-		}
-		if n1 > n2 {
-			return 1
-		}
-	}
-
-	return 0
-}
-
-type LoadedExtension struct {
-	ID        string             `json:"id"`
-	Manifest  *ExtensionManifest `json:"manifest"`
-	VM        *goja.Runtime      `json:"-"`
-	VMMu      sync.Mutex         `json:"-"`
-	Enabled   bool               `json:"enabled"`
-	Error     string             `json:"error,omitempty"`
-	DataDir   string             `json:"data_dir"`
-	SourceDir string             `json:"source_dir"`
-	IconPath  string             `json:"icon_path"`
-}
-
-type ExtensionManager struct {
-	mu            sync.RWMutex
-	extensions    map[string]*LoadedExtension
-	extensionsDir string
-	dataDir       string
-}
-
-var (
-	globalExtManager     *ExtensionManager
-	globalExtManagerOnce sync.Once
-)
-
-func GetExtensionManager() *ExtensionManager {
-	globalExtManagerOnce.Do(func() {
-		globalExtManager = &ExtensionManager{
-			extensions: make(map[string]*LoadedExtension),
-		}
-	})
-	return globalExtManager
-}
-
-func (m *ExtensionManager) SetDirectories(extensionsDir, dataDir string) error {
-	m.mu.Lock()
-	defer m.mu.Unlock()
-
-	m.extensionsDir = extensionsDir
-	m.dataDir = dataDir
-
-	if err := os.MkdirAll(extensionsDir, 0755); err != nil {
-		return fmt.Errorf("failed to create extensions directory: %w", err)
-	}
-	if err := os.MkdirAll(dataDir, 0755); err != nil {
-		return fmt.Errorf("failed to create data directory: %w", err)
-	}
-
-	return nil
-}
-
-func (m *ExtensionManager) LoadExtensionFromFile(filePath string) (*LoadedExtension, error) {
-	if !strings.HasSuffix(strings.ToLower(filePath), ".spotiflac-ext") {
-		return nil, fmt.Errorf("Invalid file format. Please select a .spotiflac-ext file")
-	}
-
-	zipReader, err := zip.OpenReader(filePath)
-	if err != nil {
-		return nil, fmt.Errorf("Cannot open extension file. The file may be corrupted or not a valid extension package")
-	}
-	defer zipReader.Close()
-
-	var manifestData []byte
-	var hasIndexJS bool
-	for _, file := range zipReader.File {
-		name := filepath.Base(file.Name)
-		if name == "manifest.json" {
-			rc, err := file.Open()
-			if err != nil {
-				return nil, fmt.Errorf("failed to open manifest.json: %w", err)
-			}
-			manifestData, err = io.ReadAll(rc)
-			rc.Close()
-			if err != nil {
-				return nil, fmt.Errorf("failed to read manifest.json: %w", err)
-			}
-		}
-		if name == "index.js" {
-			hasIndexJS = true
-		}
-	}
-
-	if manifestData == nil {
-		return nil, fmt.Errorf("Invalid extension package: manifest.json not found")
-	}
-
-	if !hasIndexJS {
-		return nil, fmt.Errorf("Invalid extension package: index.js not found")
-	}
-
-	manifest, err := ParseManifest(manifestData)
-	if err != nil {
-		return nil, fmt.Errorf("Invalid extension manifest: %w", err)
-	}
-
-	m.mu.RLock()
-	existing, exists := m.extensions[manifest.Name]
-	var existingVersion string
-	var existingDisplayName string
-	if exists {
-		existingVersion = existing.Manifest.Version
-		existingDisplayName = existing.Manifest.DisplayName
-	}
-	m.mu.RUnlock()
-
-	if exists {
-		versionCompare := compareVersions(manifest.Version, existingVersion)
-		if versionCompare > 0 {
-			// This is an upgrade - call UpgradeExtension
-			return m.UpgradeExtension(filePath)
-		} else if versionCompare == 0 {
-			return nil, fmt.Errorf("Extension '%s' v%s is already installed", existingDisplayName, existingVersion)
-		} else {
-			return nil, fmt.Errorf("Cannot downgrade '%s' from v%s to v%s", existingDisplayName, existingVersion, manifest.Version)
-		}
-	}
-
-	m.mu.Lock()
-	defer m.mu.Unlock()
-
-	if _, exists := m.extensions[manifest.Name]; exists {
-		return nil, fmt.Errorf("Extension '%s' was installed by another process", manifest.DisplayName)
-	}
-
-	extDir := filepath.Join(m.extensionsDir, manifest.Name)
-	if err := os.MkdirAll(extDir, 0755); err != nil {
-		return nil, fmt.Errorf("failed to create extension directory: %w", err)
-	}
-
-	for _, file := range zipReader.File {
-		if file.FileInfo().IsDir() {
-			continue
-		}
-
-		relPath := filepath.Clean(file.Name)
-		if strings.HasPrefix(relPath, "..") || filepath.IsAbs(relPath) {
-			GoLog("[Extension] Skipping unsafe path in archive: %s\n", file.Name)
-			continue
-		}
-		destPath := filepath.Join(extDir, relPath)
-
-		destDir := filepath.Dir(destPath)
-		if err := os.MkdirAll(destDir, 0755); err != nil {
-			return nil, fmt.Errorf("failed to create directory %s: %w", destDir, err)
-		}
-
-		destFile, err := os.Create(destPath)
-		if err != nil {
-			return nil, fmt.Errorf("failed to create file %s: %w", destPath, err)
-		}
-
-		srcFile, err := file.Open()
-		if err != nil {
-			destFile.Close()
-			return nil, fmt.Errorf("failed to open file in archive: %w", err)
-		}
-
-		_, err = io.Copy(destFile, srcFile)
-		srcFile.Close()
-		destFile.Close()
-		if err != nil {
-			return nil, fmt.Errorf("failed to extract file: %w", err)
-		}
-	}
-
-	extDataDir := filepath.Join(m.dataDir, manifest.Name)
-	if err := os.MkdirAll(extDataDir, 0755); err != nil {
-		return nil, fmt.Errorf("failed to create extension data directory: %w", err)
-	}
-
-	ext := &LoadedExtension{
-		ID:        manifest.Name,
-		Manifest:  manifest,
-		Enabled:   false, // New extensions start disabled
-		DataDir:   extDataDir,
-		SourceDir: extDir,
-	}
-
-	if err := m.initializeVM(ext); err != nil {
-		ext.Error = err.Error()
-		ext.Enabled = false
-		GoLog("[Extension] Failed to initialize VM for %s: %v\n", manifest.Name, err)
-	}
-
-	m.extensions[manifest.Name] = ext
-	GoLog("[Extension] Loaded extension: %s v%s\n", manifest.DisplayName, manifest.Version)
-
-	return ext, nil
-}
-
-func (m *ExtensionManager) initializeVM(ext *LoadedExtension) error {
-	vm := goja.New()
-	ext.VM = vm
-
-	indexPath := filepath.Join(ext.SourceDir, "index.js")
-	jsCode, err := os.ReadFile(indexPath)
-	if err != nil {
-		return fmt.Errorf("failed to read index.js: %w", err)
-	}
-
-	runtime := NewExtensionRuntime(ext)
-	runtime.RegisterAPIs(vm)
-	runtime.RegisterGoBackendAPIs(vm)
-
-	console := vm.NewObject()
-	console.Set("log", func(call goja.FunctionCall) goja.Value {
-		args := make([]interface{}, len(call.Arguments))
-		for i, arg := range call.Arguments {
-			args[i] = arg.Export()
-		}
-		GoLog("[Extension:%s] %v\n", ext.ID, args)
-		return goja.Undefined()
-	})
-	vm.Set("console", console)
-
-	var registeredExtension goja.Value
-	vm.Set("registerExtension", func(call goja.FunctionCall) goja.Value {
-		if len(call.Arguments) > 0 {
-			registeredExtension = call.Arguments[0]
-			vm.Set("extension", call.Arguments[0])
-		}
-		return goja.Undefined()
-	})
-
-	_, err = vm.RunString(string(jsCode))
-	if err != nil {
-		return fmt.Errorf("failed to execute extension code: %w", err)
-	}
-
-	if registeredExtension == nil || goja.IsUndefined(registeredExtension) {
-		return fmt.Errorf("extension did not call registerExtension()")
-	}
-
-	return nil
-}
-
-func (m *ExtensionManager) UnloadExtension(extensionID string) error {
-	m.mu.Lock()
-	defer m.mu.Unlock()
-
-	ext, exists := m.extensions[extensionID]
-	if !exists {
-		return fmt.Errorf("Extension not found")
-	}
-
-	if ext.VM != nil {
-		cleanup, err := ext.VM.RunString("typeof extension !== 'undefined' && typeof extension.cleanup === 'function' ? extension.cleanup() : null")
-		if err != nil {
-			GoLog("[Extension] Error calling cleanup for %s: %v\n", extensionID, err)
-		} else if cleanup != nil && !goja.IsUndefined(cleanup) && !goja.IsNull(cleanup) {
-			GoLog("[Extension] Cleanup called for %s\n", extensionID)
-		}
-	}
-
-	delete(m.extensions, extensionID)
-	GoLog("[Extension] Unloaded extension: %s\n", extensionID)
-
-	return nil
-}
-
-func (m *ExtensionManager) GetExtension(extensionID string) (*LoadedExtension, error) {
-	m.mu.RLock()
-	defer m.mu.RUnlock()
-
-	ext, exists := m.extensions[extensionID]
-	if !exists {
-		return nil, fmt.Errorf("Extension not found")
-	}
-	return ext, nil
-}
-
-func (m *ExtensionManager) GetAllExtensions() []*LoadedExtension {
-	m.mu.RLock()
-	defer m.mu.RUnlock()
-
-	result := make([]*LoadedExtension, 0, len(m.extensions))
-	for _, ext := range m.extensions {
-		result = append(result, ext)
-	}
-	return result
-}
-
-func (m *ExtensionManager) SetExtensionEnabled(extensionID string, enabled bool) error {
-	m.mu.Lock()
-	defer m.mu.Unlock()
-
-	ext, exists := m.extensions[extensionID]
-	if !exists {
-		return fmt.Errorf("Extension not found")
-	}
-
-	ext.Enabled = enabled
-	GoLog("[Extension] %s %s\n", extensionID, map[bool]string{true: "enabled", false: "disabled"}[enabled])
-
-	store := GetExtensionSettingsStore()
-	if err := store.Set(extensionID, "_enabled", enabled); err != nil {
-		GoLog("[Extension] Failed to persist enabled state for %s: %v\n", extensionID, err)
-	}
-
-	return nil
-}
-
-func (m *ExtensionManager) LoadExtensionsFromDirectory(dirPath string) ([]string, []error) {
-	var loaded []string
-	var errors []error
-
-	entries, err := os.ReadDir(dirPath)
-	if err != nil {
-		if os.IsNotExist(err) {
-			return loaded, errors
-		}
-		return nil, []error{fmt.Errorf("failed to read extensions directory: %w", err)}
-	}
-
-	for _, entry := range entries {
-		if entry.IsDir() {
-			manifestPath := filepath.Join(dirPath, entry.Name(), "manifest.json")
-			if _, err := os.Stat(manifestPath); err == nil {
-				ext, err := m.loadExtensionFromDirectory(filepath.Join(dirPath, entry.Name()))
-				if err != nil {
-					GoLog("[Extension] Failed to load %s: %v\n", entry.Name(), err)
-					errors = append(errors, fmt.Errorf("%s: %w", entry.Name(), err))
-				} else {
-					loaded = append(loaded, ext.ID)
-				}
-			}
-		} else if strings.HasSuffix(strings.ToLower(entry.Name()), ".spotiflac-ext") {
-			ext, err := m.LoadExtensionFromFile(filepath.Join(dirPath, entry.Name()))
-			if err != nil {
-				GoLog("[Extension] Failed to load %s: %v\n", entry.Name(), err)
-				errors = append(errors, fmt.Errorf("%s: %w", entry.Name(), err))
-			} else {
-				loaded = append(loaded, ext.ID)
-			}
-		}
-	}
-
-	return loaded, errors
-}
-
-func (m *ExtensionManager) loadExtensionFromDirectory(dirPath string) (*LoadedExtension, error) {
-	m.mu.Lock()
-	defer m.mu.Unlock()
-
-	manifestPath := filepath.Join(dirPath, "manifest.json")
-	manifestData, err := os.ReadFile(manifestPath)
-	if err != nil {
-		return nil, fmt.Errorf("failed to read manifest.json: %w", err)
-	}
-
-	// Parse and validate manifest
-	manifest, err := ParseManifest(manifestData)
-	if err != nil {
-		return nil, fmt.Errorf("Invalid extension manifest: %w", err)
-	}
-
-	indexPath := filepath.Join(dirPath, "index.js")
-	if _, err := os.Stat(indexPath); os.IsNotExist(err) {
-		return nil, fmt.Errorf("Extension is missing index.js file")
-	}
-
-	if existing, exists := m.extensions[manifest.Name]; exists {
-		GoLog("[Extension] Extension '%s' already loaded, skipping\n", manifest.DisplayName)
-		return existing, nil
-	}
-
-	extDataDir := filepath.Join(m.dataDir, manifest.Name)
-	if err := os.MkdirAll(extDataDir, 0755); err != nil {
-		return nil, fmt.Errorf("failed to create extension data directory: %w", err)
-	}
-
-	ext := &LoadedExtension{
-		ID:        manifest.Name,
-		Manifest:  manifest,
-		Enabled:   false, // Will be restored from settings store
-		DataDir:   extDataDir,
-		SourceDir: dirPath,
-	}
-
-	// Restore enabled state from settings store
-	store := GetExtensionSettingsStore()
-	if enabledVal, err := store.Get(manifest.Name, "_enabled"); err == nil {
-		if enabled, ok := enabledVal.(bool); ok {
-			ext.Enabled = enabled
-			GoLog("[Extension] Restored enabled state for %s: %v\n", manifest.Name, enabled)
-		}
-	}
-
-	if err := m.initializeVM(ext); err != nil {
-		ext.Error = err.Error()
-		ext.Enabled = false
-		GoLog("[Extension] Failed to initialize VM for %s: %v\n", manifest.Name, err)
-	}
-
-	m.extensions[manifest.Name] = ext
-	GoLog("[Extension] Loaded extension: %s v%s\n", manifest.DisplayName, manifest.Version)
-
-	return ext, nil
-}
-
-func (m *ExtensionManager) RemoveExtension(extensionID string) error {
-	ext, err := m.GetExtension(extensionID)
-	if err != nil {
-		return err
-	}
-
-	if err := m.UnloadExtension(extensionID); err != nil {
-		return err
-	}
-
-	if ext.SourceDir != "" {
-		if err := os.RemoveAll(ext.SourceDir); err != nil {
-			GoLog("[Extension] Warning: failed to remove source dir: %v\n", err)
-		}
-	}
-
-	// Optionally remove data directory (keep for now to preserve settings)
-	// if ext.DataDir != "" {
-	//     os.RemoveAll(ext.DataDir)
-	// }
-
-	return nil
-}
-
-// Only allows upgrades (new version > current version), not downgrades
-func (m *ExtensionManager) UpgradeExtension(filePath string) (*LoadedExtension, error) {
-	// Validate file extension
-	if !strings.HasSuffix(strings.ToLower(filePath), ".spotiflac-ext") {
-		return nil, fmt.Errorf("Invalid file format. Please select a .spotiflac-ext file")
-	}
-
-	zipReader, err := zip.OpenReader(filePath)
-	if err != nil {
-		return nil, fmt.Errorf("Cannot open extension file. The file may be corrupted or not a valid extension package")
-	}
-	defer zipReader.Close()
-
-	var manifestData []byte
-	var hasIndexJS bool
-	for _, file := range zipReader.File {
-		name := filepath.Base(file.Name)
-		if name == "manifest.json" {
-			rc, err := file.Open()
-			if err != nil {
-				return nil, fmt.Errorf("failed to open manifest.json: %w", err)
-			}
-			manifestData, err = io.ReadAll(rc)
-			rc.Close()
-			if err != nil {
-				return nil, fmt.Errorf("failed to read manifest.json: %w", err)
-			}
-		}
-		if name == "index.js" {
-			hasIndexJS = true
-		}
-	}
-
-	if manifestData == nil {
-		return nil, fmt.Errorf("Invalid extension package: manifest.json not found")
-	}
-
-	if !hasIndexJS {
-		return nil, fmt.Errorf("Invalid extension package: index.js not found")
-	}
-
-	newManifest, err := ParseManifest(manifestData)
-	if err != nil {
-		return nil, fmt.Errorf("Invalid extension manifest: %w", err)
-	}
-
-	m.mu.RLock()
-	existing, exists := m.extensions[newManifest.Name]
-	m.mu.RUnlock()
-
-	if !exists {
-		return nil, fmt.Errorf("Extension '%s' is not installed. Use install instead of upgrade.", newManifest.DisplayName)
-	}
-
-	// Compare versions - only allow upgrade, not downgrade
-	versionCompare := compareVersions(newManifest.Version, existing.Manifest.Version)
-	if versionCompare < 0 {
-		return nil, fmt.Errorf("Cannot downgrade extension. Current version: %s, New version: %s", existing.Manifest.Version, newManifest.Version)
-	}
-	if versionCompare == 0 {
-		return nil, fmt.Errorf("Extension is already at version %s", existing.Manifest.Version)
-	}
-
-	GoLog("[Extension] Upgrading %s from v%s to v%s\n", newManifest.DisplayName, existing.Manifest.Version, newManifest.Version)
-
-	// Save data directory path and enabled state (we want to preserve them)
-	extDataDir := existing.DataDir
-	extDir := existing.SourceDir
-	wasEnabled := existing.Enabled
-
-	m.CleanupExtension(existing.ID)
-	m.UnloadExtension(existing.ID)
-
-	if extDir != "" {
-		if err := os.RemoveAll(extDir); err != nil {
-			GoLog("[Extension] Warning: failed to remove old source dir: %v\n", err)
-		}
-	}
-
-	if err := os.MkdirAll(extDir, 0755); err != nil {
-		return nil, fmt.Errorf("failed to create extension directory: %w", err)
-	}
-
-	for _, file := range zipReader.File {
-		if file.FileInfo().IsDir() {
-			continue
-		}
-
-		relPath := filepath.Clean(file.Name)
-		if strings.HasPrefix(relPath, "..") || filepath.IsAbs(relPath) {
-			GoLog("[Extension] Skipping unsafe path in archive: %s\n", file.Name)
-			continue
-		}
-		destPath := filepath.Join(extDir, relPath)
-
-		destDir := filepath.Dir(destPath)
-		if err := os.MkdirAll(destDir, 0755); err != nil {
-			return nil, fmt.Errorf("failed to create directory %s: %w", destDir, err)
-		}
-
-		destFile, err := os.Create(destPath)
-		if err != nil {
-			return nil, fmt.Errorf("failed to create file %s: %w", destPath, err)
-		}
-
-		srcFile, err := file.Open()
-		if err != nil {
-			destFile.Close()
-			return nil, fmt.Errorf("failed to open file in archive: %w", err)
-		}
-
-		_, err = io.Copy(destFile, srcFile)
-		srcFile.Close()
-		destFile.Close()
-		if err != nil {
-			return nil, fmt.Errorf("failed to extract file: %w", err)
-		}
-	}
-
-	ext := &LoadedExtension{
-		ID:        newManifest.Name,
-		Manifest:  newManifest,
-		Enabled:   wasEnabled, // Preserve enabled state from before upgrade
-		DataDir:   extDataDir,
-		SourceDir: extDir,
-	}
-
-	// Initialize Goja VM
-	if err := m.initializeVM(ext); err != nil {
-		ext.Error = err.Error()
-		ext.Enabled = false
-		GoLog("[Extension] Failed to initialize VM for %s: %v\n", newManifest.Name, err)
-	}
-
-	m.mu.Lock()
-	m.extensions[newManifest.Name] = ext
-	m.mu.Unlock()
-
-	GoLog("[Extension] Upgraded extension: %s to v%s\n", newManifest.DisplayName, newManifest.Version)
-
-	return ext, nil
-}
-
-type ExtensionUpgradeInfo struct {
-	ExtensionID    string `json:"extension_id"`
-	CurrentVersion string `json:"current_version"`
-	NewVersion     string `json:"new_version"`
-	CanUpgrade     bool   `json:"can_upgrade"`
-	IsInstalled    bool   `json:"is_installed"`
-}
-
-func (m *ExtensionManager) checkExtensionUpgradeInternal(filePath string) (*ExtensionUpgradeInfo, error) {
-	// Validate file extension
-	if !strings.HasSuffix(strings.ToLower(filePath), ".spotiflac-ext") {
-		return nil, fmt.Errorf("Invalid file format. Please select a .spotiflac-ext file")
-	}
-
-	zipReader, err := zip.OpenReader(filePath)
-
-	if err != nil {
-		return nil, fmt.Errorf("Cannot open extension file")
-	}
-	defer zipReader.Close()
-
-	var manifestData []byte
-	for _, file := range zipReader.File {
-		name := filepath.Base(file.Name)
-		if name == "manifest.json" {
-			rc, err := file.Open()
-			if err != nil {
-				return nil, fmt.Errorf("failed to open manifest.json")
-			}
-			manifestData, err = io.ReadAll(rc)
-			rc.Close()
-			if err != nil {
-				return nil, fmt.Errorf("failed to read manifest.json")
-			}
-			break
-		}
-	}
-
-	if manifestData == nil {
-		return nil, fmt.Errorf("manifest.json not found")
-	}
-
-	newManifest, err := ParseManifest(manifestData)
-	if err != nil {
-		return nil, fmt.Errorf("Invalid manifest: %w", err)
-	}
-
-	m.mu.RLock()
-	existing, exists := m.extensions[newManifest.Name]
-	m.mu.RUnlock()
-
-	info := &ExtensionUpgradeInfo{
-		ExtensionID: newManifest.Name,
-		NewVersion:  newManifest.Version,
-		IsInstalled: exists,
-	}
-
-	if !exists {
-		// Not installed - this is a new install, not upgrade
-		info.CurrentVersion = ""
-		info.CanUpgrade = false
-	} else {
-		info.CurrentVersion = existing.Manifest.Version
-		info.CanUpgrade = compareVersions(newManifest.Version, existing.Manifest.Version) > 0
-	}
-
-	return info, nil
-}
-
-func (m *ExtensionManager) CheckExtensionUpgradeJSON(filePath string) (string, error) {
-	info, err := m.checkExtensionUpgradeInternal(filePath)
-	if err != nil {
-		return "", err
-	}
-
-	jsonBytes, err := json.Marshal(info)
-	if err != nil {
-		return "", err
-	}
-
-	return string(jsonBytes), nil
-}
-
-func (m *ExtensionManager) GetInstalledExtensionsJSON() (string, error) {
-	extensions := m.GetAllExtensions()
-
-	type ExtensionInfo struct {
-		ID                     string                 `json:"id"`
-		Name                   string                 `json:"name"`
-		DisplayName            string                 `json:"display_name"`
-		Version                string                 `json:"version"`
-		Author                 string                 `json:"author"`
-		Description            string                 `json:"description"`
-		Homepage               string                 `json:"homepage,omitempty"`
-		IconPath               string                 `json:"icon_path,omitempty"`
-		Types                  []ExtensionType        `json:"types"`
-		Enabled                bool                   `json:"enabled"`
-		Status                 string                 `json:"status"`
-		Error                  string                 `json:"error_message,omitempty"`
-		Settings               []ExtensionSetting     `json:"settings,omitempty"`
-		QualityOptions         []QualityOption        `json:"quality_options,omitempty"`
-		Permissions            []string               `json:"permissions"`
-		HasMetadataProvider    bool                   `json:"has_metadata_provider"`
-		HasDownloadProvider    bool                   `json:"has_download_provider"`
-		SkipMetadataEnrichment bool                   `json:"skip_metadata_enrichment"`
-		SearchBehavior         *SearchBehaviorConfig  `json:"search_behavior,omitempty"`
-		TrackMatching          *TrackMatchingConfig   `json:"track_matching,omitempty"`
-		PostProcessing         *PostProcessingConfig  `json:"post_processing,omitempty"`
-		Capabilities           map[string]interface{} `json:"capabilities,omitempty"`
-	}
-
-	infos := make([]ExtensionInfo, len(extensions))
-	for i, ext := range extensions {
-		permissions := []string{}
-		for _, domain := range ext.Manifest.Permissions.Network {
-			permissions = append(permissions, "network:"+domain)
-		}
-		if ext.Manifest.Permissions.Storage {
-			permissions = append(permissions, "storage:enabled")
-		}
-
-		// Determine status
-		status := "loaded"
-		if ext.Error != "" {
-			status = "error"
-		} else if !ext.Enabled {
-			status = "disabled"
-		}
-
-		iconPath := ""
-		if ext.Manifest.Icon != "" && ext.SourceDir != "" {
-			possibleIcon := filepath.Join(ext.SourceDir, ext.Manifest.Icon)
-			if _, err := os.Stat(possibleIcon); err == nil {
-				iconPath = possibleIcon
-			}
-		}
-		if iconPath == "" && ext.SourceDir != "" {
-			possibleIcon := filepath.Join(ext.SourceDir, "icon.png")
-			if _, err := os.Stat(possibleIcon); err == nil {
-				iconPath = possibleIcon
-			}
-		}
-
-		infos[i] = ExtensionInfo{
-			ID:                     ext.ID,
-			Name:                   ext.Manifest.Name,
-			DisplayName:            ext.Manifest.DisplayName,
-			Version:                ext.Manifest.Version,
-			Author:                 ext.Manifest.Author,
-			Description:            ext.Manifest.Description,
-			Homepage:               ext.Manifest.Homepage,
-			IconPath:               iconPath,
-			Types:                  ext.Manifest.Types,
-			Enabled:                ext.Enabled,
-			Status:                 status,
-			Error:                  ext.Error,
-			Settings:               ext.Manifest.Settings,
-			QualityOptions:         ext.Manifest.QualityOptions,
-			Permissions:            permissions,
-			HasMetadataProvider:    ext.Manifest.IsMetadataProvider(),
-			HasDownloadProvider:    ext.Manifest.IsDownloadProvider(),
-			SkipMetadataEnrichment: ext.Manifest.SkipMetadataEnrichment,
-			SearchBehavior:         ext.Manifest.SearchBehavior,
-			TrackMatching:          ext.Manifest.TrackMatching,
-			PostProcessing:         ext.Manifest.PostProcessing,
-			Capabilities:           ext.Manifest.Capabilities,
-		}
-	}
-
-	jsonBytes, err := json.Marshal(infos)
-	if err != nil {
-		return "", err
-	}
-
-	return string(jsonBytes), nil
-}
-
-func (m *ExtensionManager) InitializeExtension(extensionID string, settings map[string]interface{}) error {
-	m.mu.Lock()
-	defer m.mu.Unlock()
-
-	ext, exists := m.extensions[extensionID]
-	if !exists {
-		return fmt.Errorf("Extension not found")
-	}
-
-	if ext.VM == nil {
-		return fmt.Errorf("Extension failed to load. Please reinstall the extension")
-	}
-
-	settingsJSON, err := json.Marshal(settings)
-	if err != nil {
-		return fmt.Errorf("Failed to save settings")
-	}
-
-	script := fmt.Sprintf(`
-		(function() {
-			var settings = %s;
-			if (typeof extension !== 'undefined' && typeof extension.initialize === 'function') {
-				try {
-					extension.initialize(settings);
-					return { success: true };
-				} catch (e) {
-					return { success: false, error: e.toString() };
-				}
-			}
-			return { success: true, message: 'no initialize function' };
-		})()
-	`, string(settingsJSON))
-
-	result, err := ext.VM.RunString(script)
-	if err != nil {
-		ext.Error = fmt.Sprintf("initialize failed: %v", err)
-		ext.Enabled = false
-		GoLog("[Extension] Initialize error for %s: %v\n", extensionID, err)
-		return err
-	}
-
-	if result != nil && !goja.IsUndefined(result) {
-		exported := result.Export()
-		if resultMap, ok := exported.(map[string]interface{}); ok {
-			if success, ok := resultMap["success"].(bool); ok && !success {
-				errMsg := "unknown error"
-				if e, ok := resultMap["error"].(string); ok {
-					errMsg = e
-				}
-				ext.Error = errMsg
-				ext.Enabled = false
-				GoLog("[Extension] Initialize failed for %s: %s\n", extensionID, errMsg)
-				return fmt.Errorf("initialize failed: %s", errMsg)
-			}
-		}
-	}
-
-	GoLog("[Extension] Initialized %s\n", extensionID)
-	return nil
-}
-
-func (m *ExtensionManager) CleanupExtension(extensionID string) error {
-	m.mu.Lock()
-	defer m.mu.Unlock()
-
-	ext, exists := m.extensions[extensionID]
-	if !exists {
-		return fmt.Errorf("Extension not found")
-	}
-
-	if ext.VM == nil {
-		return nil
-	}
-
-	script := `
-		(function() {
-			if (typeof extension !== 'undefined' && typeof extension.cleanup === 'function') {
-				try {
-					extension.cleanup();
-					return { success: true };
-				} catch (e) {
-					return { success: false, error: e.toString() };
-				}
-			}
-			return { success: true, message: 'no cleanup function' };
-		})()
-	`
-
-	result, err := ext.VM.RunString(script)
-	if err != nil {
-		GoLog("[Extension] Cleanup error for %s: %v\n", extensionID, err)
-		return err
-	}
-
-	if result != nil && !goja.IsUndefined(result) {
-		exported := result.Export()
-		if resultMap, ok := exported.(map[string]interface{}); ok {
-			if success, ok := resultMap["success"].(bool); ok && !success {
-				errMsg := "unknown error"
-				if e, ok := resultMap["error"].(string); ok {
-					errMsg = e
-				}
-				GoLog("[Extension] Cleanup failed for %s: %s\n", extensionID, errMsg)
-				return fmt.Errorf("cleanup failed: %s", errMsg)
-			}
-		}
-	}
-
-	GoLog("[Extension] Cleaned up %s\n", extensionID)
-	return nil
-}
-
-func (m *ExtensionManager) UnloadAllExtensions() {
-	m.mu.Lock()
-	extensionIDs := make([]string, 0, len(m.extensions))
-	for id := range m.extensions {
-		extensionIDs = append(extensionIDs, id)
-	}
-	m.mu.Unlock()
-
-	for _, id := range extensionIDs {
-		m.CleanupExtension(id)
-		m.UnloadExtension(id)
-	}
-
-	GoLog("[Extension] All extensions unloaded\n")
-}
-
-func (m *ExtensionManager) InvokeAction(extensionID string, actionName string) (map[string]interface{}, error) {
-	m.mu.Lock()
-	defer m.mu.Unlock()
-
-	ext, exists := m.extensions[extensionID]
-	if !exists {
-		return nil, fmt.Errorf("extension not found: %s", extensionID)
-	}
-
-	if ext.VM == nil {
-		return nil, fmt.Errorf("extension VM not initialized")
-	}
-
-	if !ext.Enabled {
-		return nil, fmt.Errorf("extension is disabled")
-	}
-
-	// Call the action function on the extension object
-	script := fmt.Sprintf(`
-		(function() {
-			if (typeof extension !== 'undefined' && typeof extension.%s === 'function') {
-				try {
-					var result = extension.%s();
-					if (result && typeof result.then === 'function') {
-						// Handle promise - return pending status
-						return { success: true, pending: true, message: 'Action started' };
-					}
-					return { success: true, result: result };
-				} catch (e) {
-					return { success: false, error: e.toString() };
-				}
-			}
-			return { success: false, error: 'Action function not found: %s' };
-		})()
-	`, actionName, actionName, actionName)
-
-	result, err := RunWithTimeoutAndRecover(ext.VM, script, DefaultJSTimeout)
-	if err != nil {
-		GoLog("[Extension] InvokeAction error for %s.%s: %v\n", extensionID, actionName, err)
-		return nil, fmt.Errorf("action failed: %v", err)
-	}
-
-	if result == nil || goja.IsUndefined(result) {
-		return map[string]interface{}{"success": true}, nil
-	}
-
-	exported := result.Export()
-	if resultMap, ok := exported.(map[string]interface{}); ok {
-		GoLog("[Extension] InvokeAction %s.%s result: %v\n", extensionID, actionName, resultMap)
-		return resultMap, nil
-	}
-
-	return map[string]interface{}{"success": true, "result": exported}, nil
-}

go_backend/extension_manifest.go

@@ -1,287 +0,0 @@
-// Package gobackend provides extension manifest parsing and validation
-package gobackend
-
-import (
-	"encoding/json"
-	"fmt"
-	"strings"
-)
-
-type ExtensionType string
-
-const (
-	ExtensionTypeMetadataProvider ExtensionType = "metadata_provider"
-	ExtensionTypeDownloadProvider ExtensionType = "download_provider"
-)
-
-type SettingType string
-
-const (
-	SettingTypeString SettingType = "string"
-	SettingTypeNumber SettingType = "number"
-	SettingTypeBool   SettingType = "boolean"
-	SettingTypeSelect SettingType = "select"
-	SettingTypeButton SettingType = "button" // Action button that calls a JS function
-)
-
-type ExtensionPermissions struct {
-	Network []string `json:"network"`
-	Storage bool     `json:"storage"`
-	File    bool     `json:"file"`
-}
-
-type ExtensionSetting struct {
-	Key         string      `json:"key"`
-	Type        SettingType `json:"type"`
-	Label       string      `json:"label"`
-	Description string      `json:"description,omitempty"`
-	Required    bool        `json:"required,omitempty"`
-	Secret      bool        `json:"secret,omitempty"`
-	Default     interface{} `json:"default,omitempty"`
-	Options     []string    `json:"options,omitempty"`
-	Action      string      `json:"action,omitempty"`
-}
-
-type QualityOption struct {
-	ID          string                   `json:"id"`
-	Label       string                   `json:"label"`
-	Description string                   `json:"description"`
-	Settings    []QualitySpecificSetting `json:"settings,omitempty"`
-}
-
-type QualitySpecificSetting struct {
-	Key         string      `json:"key"`
-	Type        SettingType `json:"type"`
-	Label       string      `json:"label"`
-	Description string      `json:"description,omitempty"`
-	Required    bool        `json:"required,omitempty"`
-	Secret      bool        `json:"secret,omitempty"`
-	Default     interface{} `json:"default,omitempty"`
-	Options     []string    `json:"options,omitempty"`
-}
-
-type SearchFilter struct {
-	ID    string `json:"id"`
-	Label string `json:"label,omitempty"`
-	Icon  string `json:"icon,omitempty"`
-}
-
-type SearchBehaviorConfig struct {
-	Enabled         bool           `json:"enabled"`
-	Placeholder     string         `json:"placeholder,omitempty"`
-	Primary         bool           `json:"primary,omitempty"`
-	Icon            string         `json:"icon,omitempty"`
-	ThumbnailRatio  string         `json:"thumbnailRatio,omitempty"`
-	ThumbnailWidth  int            `json:"thumbnailWidth,omitempty"`
-	ThumbnailHeight int            `json:"thumbnailHeight,omitempty"`
-	Filters         []SearchFilter `json:"filters,omitempty"`
-}
-
-type URLHandlerConfig struct {
-	Enabled  bool     `json:"enabled"`
-	Patterns []string `json:"patterns,omitempty"`
-}
-
-type TrackMatchingConfig struct {
-	CustomMatching    bool   `json:"customMatching"`
-	Strategy          string `json:"strategy,omitempty"`
-	DurationTolerance int    `json:"durationTolerance,omitempty"`
-}
-
-type PostProcessingHook struct {
-	ID               string   `json:"id"`
-	Name             string   `json:"name"`
-	Description      string   `json:"description,omitempty"`
-	DefaultEnabled   bool     `json:"defaultEnabled,omitempty"`
-	SupportedFormats []string `json:"supportedFormats,omitempty"`
-}
-
-type PostProcessingConfig struct {
-	Enabled bool                 `json:"enabled"`
-	Hooks   []PostProcessingHook `json:"hooks,omitempty"`
-}
-
-type ExtensionManifest struct {
-	Name                   string                 `json:"name"`
-	DisplayName            string                 `json:"displayName"`
-	Version                string                 `json:"version"`
-	Author                 string                 `json:"author"`
-	Description            string                 `json:"description"`
-	Homepage               string                 `json:"homepage,omitempty"`
-	Icon                   string                 `json:"icon,omitempty"`
-	Types                  []ExtensionType        `json:"type"`
-	Permissions            ExtensionPermissions   `json:"permissions"`
-	Settings               []ExtensionSetting     `json:"settings,omitempty"`
-	QualityOptions         []QualityOption        `json:"qualityOptions,omitempty"`
-	MinAppVersion          string                 `json:"minAppVersion,omitempty"`
-	SkipMetadataEnrichment bool                   `json:"skipMetadataEnrichment,omitempty"`
-	SkipBuiltInFallback    bool                   `json:"skipBuiltInFallback,omitempty"`
-	SearchBehavior         *SearchBehaviorConfig  `json:"searchBehavior,omitempty"`
-	URLHandler             *URLHandlerConfig      `json:"urlHandler,omitempty"`
-	TrackMatching          *TrackMatchingConfig   `json:"trackMatching,omitempty"`
-	PostProcessing         *PostProcessingConfig  `json:"postProcessing,omitempty"`
-	Capabilities           map[string]interface{} `json:"capabilities,omitempty"`
-}
-
-type ManifestValidationError struct {
-	Field   string
-	Message string
-}
-
-func (e *ManifestValidationError) Error() string {
-	return fmt.Sprintf("manifest validation error: %s - %s", e.Field, e.Message)
-}
-
-func ParseManifest(data []byte) (*ExtensionManifest, error) {
-	var manifest ExtensionManifest
-	if err := json.Unmarshal(data, &manifest); err != nil {
-		return nil, fmt.Errorf("failed to parse manifest JSON: %w", err)
-	}
-
-	if err := manifest.Validate(); err != nil {
-		return nil, err
-	}
-
-	return &manifest, nil
-}
-
-func (m *ExtensionManifest) Validate() error {
-	if strings.TrimSpace(m.Name) == "" {
-		return &ManifestValidationError{Field: "name", Message: "name is required"}
-	}
-
-	if strings.TrimSpace(m.Version) == "" {
-		return &ManifestValidationError{Field: "version", Message: "version is required"}
-	}
-
-	if strings.TrimSpace(m.Author) == "" {
-		return &ManifestValidationError{Field: "author", Message: "author is required"}
-	}
-
-	if strings.TrimSpace(m.Description) == "" {
-		return &ManifestValidationError{Field: "description", Message: "description is required"}
-	}
-
-	if len(m.Types) == 0 {
-		return &ManifestValidationError{Field: "type", Message: "at least one type is required"}
-	}
-
-	for _, t := range m.Types {
-		if t != ExtensionTypeMetadataProvider && t != ExtensionTypeDownloadProvider {
-			return &ManifestValidationError{
-				Field:   "type",
-				Message: fmt.Sprintf("invalid extension type: %s (must be 'metadata_provider' or 'download_provider')", t),
-			}
-		}
-	}
-
-	for i, setting := range m.Settings {
-		if strings.TrimSpace(setting.Key) == "" {
-			return &ManifestValidationError{
-				Field:   fmt.Sprintf("settings[%d].key", i),
-				Message: "setting key is required",
-			}
-		}
-
-		if setting.Type == "" {
-			return &ManifestValidationError{
-				Field:   fmt.Sprintf("settings[%d].type", i),
-				Message: "setting type is required",
-			}
-		}
-
-		// Select type requires options
-		if setting.Type == SettingTypeSelect && len(setting.Options) == 0 {
-			return &ManifestValidationError{
-				Field:   fmt.Sprintf("settings[%d].options", i),
-				Message: "select type requires options",
-			}
-		}
-
-		if setting.Type == SettingTypeButton && setting.Action == "" {
-			return &ManifestValidationError{
-				Field:   fmt.Sprintf("settings[%d].action", i),
-				Message: "button type requires action (JS function name)",
-			}
-		}
-	}
-
-	return nil
-}
-
-func (m *ExtensionManifest) HasType(t ExtensionType) bool {
-	for _, et := range m.Types {
-		if et == t {
-			return true
-		}
-	}
-	return false
-}
-
-func (m *ExtensionManifest) IsMetadataProvider() bool {
-	return m.HasType(ExtensionTypeMetadataProvider)
-}
-
-func (m *ExtensionManifest) IsDownloadProvider() bool {
-	return m.HasType(ExtensionTypeDownloadProvider)
-}
-
-func (m *ExtensionManifest) IsDomainAllowed(domain string) bool {
-	domain = strings.ToLower(strings.TrimSpace(domain))
-	for _, allowed := range m.Permissions.Network {
-		allowed = strings.ToLower(strings.TrimSpace(allowed))
-		if allowed == domain {
-			return true
-		}
-		// Support wildcard subdomains (e.g., *.example.com)
-		if strings.HasPrefix(allowed, "*.") {
-			suffix := allowed[1:]
-			if strings.HasSuffix(domain, suffix) {
-				return true
-			}
-		}
-	}
-	return false
-}
-
-func (m *ExtensionManifest) HasCustomSearch() bool {
-	return m.SearchBehavior != nil && m.SearchBehavior.Enabled
-}
-
-func (m *ExtensionManifest) HasCustomMatching() bool {
-	return m.TrackMatching != nil && m.TrackMatching.CustomMatching
-}
-
-func (m *ExtensionManifest) HasPostProcessing() bool {
-	return m.PostProcessing != nil && m.PostProcessing.Enabled
-}
-
-func (m *ExtensionManifest) HasURLHandler() bool {
-	return m.URLHandler != nil && m.URLHandler.Enabled && len(m.URLHandler.Patterns) > 0
-}
-
-func (m *ExtensionManifest) MatchesURL(urlStr string) bool {
-	if !m.HasURLHandler() {
-		return false
-	}
-
-	urlStr = strings.ToLower(strings.TrimSpace(urlStr))
-	for _, pattern := range m.URLHandler.Patterns {
-		pattern = strings.ToLower(strings.TrimSpace(pattern))
-		if strings.Contains(urlStr, pattern) {
-			return true
-		}
-	}
-	return false
-}
-
-func (m *ExtensionManifest) GetPostProcessingHooks() []PostProcessingHook {
-	if m.PostProcessing == nil {
-		return nil
-	}
-	return m.PostProcessing.Hooks
-}
-
-func (m *ExtensionManifest) ToJSON() ([]byte, error) {
-	return json.Marshal(m)
-}

go_backend/extension_runtime.go

@@ -1,324 +0,0 @@
-package gobackend
-
-import (
-	"fmt"
-	"net"
-	"net/http"
-	"net/url"
-	"strings"
-	"sync"
-	"time"
-
-	"github.com/dop251/goja"
-)
-
-const DefaultJSTimeout = 30 * time.Second
-
-var (
-	extensionAuthState   = make(map[string]*ExtensionAuthState)
-	extensionAuthStateMu sync.RWMutex
-)
-
-type ExtensionAuthState struct {
-	PendingAuthURL  string
-	AuthCode        string
-	AccessToken     string
-	RefreshToken    string
-	ExpiresAt       time.Time
-	IsAuthenticated bool
-	PKCEVerifier    string
-	PKCEChallenge   string
-}
-
-type PendingAuthRequest struct {
-	ExtensionID string
-	AuthURL     string
-	CallbackURL string
-}
-
-var (
-	pendingAuthRequests   = make(map[string]*PendingAuthRequest)
-	pendingAuthRequestsMu sync.RWMutex
-)
-
-func GetPendingAuthRequest(extensionID string) *PendingAuthRequest {
-	pendingAuthRequestsMu.RLock()
-	defer pendingAuthRequestsMu.RUnlock()
-	return pendingAuthRequests[extensionID]
-}
-
-func ClearPendingAuthRequest(extensionID string) {
-	pendingAuthRequestsMu.Lock()
-	defer pendingAuthRequestsMu.Unlock()
-	delete(pendingAuthRequests, extensionID)
-}
-
-func SetExtensionAuthCode(extensionID string, authCode string) {
-	extensionAuthStateMu.Lock()
-	defer extensionAuthStateMu.Unlock()
-
-	state, exists := extensionAuthState[extensionID]
-	if !exists {
-		state = &ExtensionAuthState{}
-		extensionAuthState[extensionID] = state
-	}
-	state.AuthCode = authCode
-}
-
-func SetExtensionTokens(extensionID string, accessToken, refreshToken string, expiresAt time.Time) {
-	extensionAuthStateMu.Lock()
-	defer extensionAuthStateMu.Unlock()
-
-	state, exists := extensionAuthState[extensionID]
-	if !exists {
-		state = &ExtensionAuthState{}
-		extensionAuthState[extensionID] = state
-	}
-	state.AccessToken = accessToken
-	state.RefreshToken = refreshToken
-	state.ExpiresAt = expiresAt
-	state.IsAuthenticated = accessToken != ""
-}
-
-type ExtensionRuntime struct {
-	extensionID string
-	manifest    *ExtensionManifest
-	settings    map[string]interface{}
-	httpClient  *http.Client
-	cookieJar   http.CookieJar
-	dataDir     string
-	vm          *goja.Runtime
-}
-
-func NewExtensionRuntime(ext *LoadedExtension) *ExtensionRuntime {
-	jar, _ := newSimpleCookieJar()
-
-	runtime := &ExtensionRuntime{
-		extensionID: ext.ID,
-		manifest:    ext.Manifest,
-		settings:    make(map[string]interface{}),
-		cookieJar:   jar,
-		dataDir:     ext.DataDir,
-		vm:          ext.VM,
-	}
-
-	client := &http.Client{
-		Timeout: 30 * time.Second,
-		Jar:     jar,
-		CheckRedirect: func(req *http.Request, via []*http.Request) error {
-			if req.URL.Scheme != "https" {
-				GoLog("[Extension:%s] Redirect blocked: non-https scheme '%s'\n", ext.ID, req.URL.Scheme)
-				return fmt.Errorf("redirect blocked: only https is allowed")
-			}
-
-			domain := req.URL.Hostname()
-			if domain == "" {
-				GoLog("[Extension:%s] Redirect blocked: missing hostname\n", ext.ID)
-				return fmt.Errorf("redirect blocked: hostname is required")
-			}
-			if !ext.Manifest.IsDomainAllowed(domain) {
-				GoLog("[Extension:%s] Redirect blocked: domain '%s' not in allowed list\n", ext.ID, domain)
-				return &RedirectBlockedError{Domain: domain}
-			}
-			if isPrivateIP(domain) {
-				GoLog("[Extension:%s] Redirect blocked: private IP '%s'\n", ext.ID, domain)
-				return &RedirectBlockedError{Domain: domain, IsPrivate: true}
-			}
-			if len(via) >= 10 {
-				return http.ErrUseLastResponse
-			}
-			return nil
-		},
-	}
-	runtime.httpClient = client
-
-	return runtime
-}
-
-type RedirectBlockedError struct {
-	Domain    string
-	IsPrivate bool
-}
-
-func (e *RedirectBlockedError) Error() string {
-	if e.IsPrivate {
-		return "redirect blocked: private/local network access denied"
-	}
-	return "redirect blocked: domain '" + e.Domain + "' not in allowed list"
-}
-
-// isPrivateIP checks if a hostname resolves to a private/local IP address
-func isPrivateIP(host string) bool {
-	hostLower := strings.ToLower(strings.TrimSpace(host))
-	if hostLower == "" {
-		return false
-	}
-
-	if hostLower == "localhost" || strings.HasSuffix(hostLower, ".local") {
-		return true
-	}
-
-	if ip := net.ParseIP(hostLower); ip != nil {
-		return isPrivateIPAddr(ip)
-	}
-
-	ips, err := net.LookupIP(hostLower)
-	if err != nil {
-		return false
-	}
-
-	for _, ip := range ips {
-		if isPrivateIPAddr(ip) {
-			return true
-		}
-	}
-
-	return false
-}
-
-func isPrivateIPAddr(ip net.IP) bool {
-	if ip == nil {
-		return false
-	}
-	if ip.IsLoopback() ||
-		ip.IsPrivate() ||
-		ip.IsLinkLocalUnicast() ||
-		ip.IsLinkLocalMulticast() ||
-		ip.IsMulticast() ||
-		ip.IsUnspecified() {
-		return true
-	}
-	if !ip.IsGlobalUnicast() {
-		return true
-	}
-	return false
-}
-
-type simpleCookieJar struct {
-	cookies map[string][]*http.Cookie
-	mu      sync.RWMutex
-}
-
-func newSimpleCookieJar() (*simpleCookieJar, error) {
-	return &simpleCookieJar{
-		cookies: make(map[string][]*http.Cookie),
-	}, nil
-}
-
-func (j *simpleCookieJar) SetCookies(u *url.URL, cookies []*http.Cookie) {
-	j.mu.Lock()
-	defer j.mu.Unlock()
-	key := u.Host
-	j.cookies[key] = append(j.cookies[key], cookies...)
-}
-
-func (j *simpleCookieJar) Cookies(u *url.URL) []*http.Cookie {
-	j.mu.RLock()
-	defer j.mu.RUnlock()
-	return j.cookies[u.Host]
-}
-
-func (r *ExtensionRuntime) SetSettings(settings map[string]interface{}) {
-	r.settings = settings
-}
-
-func (r *ExtensionRuntime) RegisterAPIs(vm *goja.Runtime) {
-	r.vm = vm
-
-	httpObj := vm.NewObject()
-	httpObj.Set("get", r.httpGet)
-	httpObj.Set("post", r.httpPost)
-	httpObj.Set("put", r.httpPut)
-	httpObj.Set("delete", r.httpDelete)
-	httpObj.Set("patch", r.httpPatch)
-	httpObj.Set("request", r.httpRequest)
-	httpObj.Set("clearCookies", r.httpClearCookies)
-	vm.Set("http", httpObj)
-
-	storageObj := vm.NewObject()
-	storageObj.Set("get", r.storageGet)
-	storageObj.Set("set", r.storageSet)
-	storageObj.Set("remove", r.storageRemove)
-	vm.Set("storage", storageObj)
-
-	credentialsObj := vm.NewObject()
-	credentialsObj.Set("store", r.credentialsStore)
-	credentialsObj.Set("get", r.credentialsGet)
-	credentialsObj.Set("remove", r.credentialsRemove)
-	credentialsObj.Set("has", r.credentialsHas)
-	vm.Set("credentials", credentialsObj)
-
-	authObj := vm.NewObject()
-	authObj.Set("openAuthUrl", r.authOpenUrl)
-	authObj.Set("getAuthCode", r.authGetCode)
-	authObj.Set("setAuthCode", r.authSetCode)
-	authObj.Set("clearAuth", r.authClear)
-	authObj.Set("isAuthenticated", r.authIsAuthenticated)
-	authObj.Set("getTokens", r.authGetTokens)
-	authObj.Set("generatePKCE", r.authGeneratePKCE)
-	authObj.Set("getPKCE", r.authGetPKCE)
-	authObj.Set("startOAuthWithPKCE", r.authStartOAuthWithPKCE)
-	authObj.Set("exchangeCodeWithPKCE", r.authExchangeCodeWithPKCE)
-	vm.Set("auth", authObj)
-
-	fileObj := vm.NewObject()
-	fileObj.Set("download", r.fileDownload)
-	fileObj.Set("exists", r.fileExists)
-	fileObj.Set("delete", r.fileDelete)
-	fileObj.Set("read", r.fileRead)
-	fileObj.Set("write", r.fileWrite)
-	fileObj.Set("copy", r.fileCopy)
-	fileObj.Set("move", r.fileMove)
-	fileObj.Set("getSize", r.fileGetSize)
-	vm.Set("file", fileObj)
-
-	ffmpegObj := vm.NewObject()
-	ffmpegObj.Set("execute", r.ffmpegExecute)
-	ffmpegObj.Set("getInfo", r.ffmpegGetInfo)
-	ffmpegObj.Set("convert", r.ffmpegConvert)
-	vm.Set("ffmpeg", ffmpegObj)
-
-	matchingObj := vm.NewObject()
-	matchingObj.Set("compareStrings", r.matchingCompareStrings)
-	matchingObj.Set("compareDuration", r.matchingCompareDuration)
-	matchingObj.Set("normalizeString", r.matchingNormalizeString)
-	vm.Set("matching", matchingObj)
-
-	utilsObj := vm.NewObject()
-	utilsObj.Set("base64Encode", r.base64Encode)
-	utilsObj.Set("base64Decode", r.base64Decode)
-	utilsObj.Set("md5", r.md5Hash)
-	utilsObj.Set("sha256", r.sha256Hash)
-	utilsObj.Set("hmacSHA256", r.hmacSHA256)
-	utilsObj.Set("hmacSHA256Base64", r.hmacSHA256Base64)
-	utilsObj.Set("hmacSHA1", r.hmacSHA1)
-	utilsObj.Set("parseJSON", r.parseJSON)
-	utilsObj.Set("stringifyJSON", r.stringifyJSON)
-	utilsObj.Set("encrypt", r.cryptoEncrypt)
-	utilsObj.Set("decrypt", r.cryptoDecrypt)
-	utilsObj.Set("generateKey", r.cryptoGenerateKey)
-	utilsObj.Set("randomUserAgent", r.randomUserAgent)
-	vm.Set("utils", utilsObj)
-
-	logObj := vm.NewObject()
-	logObj.Set("debug", r.logDebug)
-	logObj.Set("info", r.logInfo)
-	logObj.Set("warn", r.logWarn)
-	logObj.Set("error", r.logError)
-	vm.Set("log", logObj)
-
-	gobackendObj := vm.NewObject()
-	gobackendObj.Set("sanitizeFilename", r.sanitizeFilenameWrapper)
-	vm.Set("gobackend", gobackendObj)
-
-	vm.Set("fetch", r.fetchPolyfill)
-
-	vm.Set("atob", r.atobPolyfill)
-	vm.Set("btoa", r.btoaPolyfill)
-
-	r.registerTextEncoderDecoder(vm)
-
-	r.registerURLClass(vm)
-
-	r.registerJSONGlobal(vm)
-}

go_backend/extension_runtime_auth.go

@@ -1,507 +0,0 @@
-// Package gobackend provides Auth API and PKCE support for extension runtime
-package gobackend
-
-import (
-	"crypto/rand"
-	"crypto/sha256"
-	"encoding/base64"
-	"encoding/json"
-	"fmt"
-	"io"
-	"net/http"
-	"net/url"
-	"strings"
-	"time"
-
-	"github.com/dop251/goja"
-)
-
-// ==================== Auth API (OAuth Support) ====================
-
-func (r *ExtensionRuntime) authOpenUrl(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   "auth URL is required",
-		})
-	}
-
-	authURL := call.Arguments[0].String()
-	callbackURL := ""
-	if len(call.Arguments) > 1 && !goja.IsUndefined(call.Arguments[1]) {
-		callbackURL = call.Arguments[1].String()
-	}
-
-	pendingAuthRequestsMu.Lock()
-	pendingAuthRequests[r.extensionID] = &PendingAuthRequest{
-		ExtensionID: r.extensionID,
-		AuthURL:     authURL,
-		CallbackURL: callbackURL,
-	}
-	pendingAuthRequestsMu.Unlock()
-
-	extensionAuthStateMu.Lock()
-	state, exists := extensionAuthState[r.extensionID]
-	if !exists {
-		state = &ExtensionAuthState{}
-		extensionAuthState[r.extensionID] = state
-	}
-	state.PendingAuthURL = authURL
-	state.AuthCode = ""
-	extensionAuthStateMu.Unlock()
-
-	GoLog("[Extension:%s] Auth URL requested: %s\n", r.extensionID, authURL)
-
-	return r.vm.ToValue(map[string]interface{}{
-		"success": true,
-		"message": "Auth URL will be opened by the app",
-	})
-}
-
-func (r *ExtensionRuntime) authGetCode(call goja.FunctionCall) goja.Value {
-	extensionAuthStateMu.RLock()
-	defer extensionAuthStateMu.RUnlock()
-
-	state, exists := extensionAuthState[r.extensionID]
-	if !exists || state.AuthCode == "" {
-		return goja.Undefined()
-	}
-
-	return r.vm.ToValue(state.AuthCode)
-}
-
-func (r *ExtensionRuntime) authSetCode(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue(false)
-	}
-
-	arg := call.Arguments[0].Export()
-
-	extensionAuthStateMu.Lock()
-	defer extensionAuthStateMu.Unlock()
-
-	state, exists := extensionAuthState[r.extensionID]
-	if !exists {
-		state = &ExtensionAuthState{}
-		extensionAuthState[r.extensionID] = state
-	}
-
-	switch v := arg.(type) {
-	case string:
-		state.AuthCode = v
-	case map[string]interface{}:
-		if code, ok := v["code"].(string); ok {
-			state.AuthCode = code
-		}
-		if accessToken, ok := v["access_token"].(string); ok {
-			state.AccessToken = accessToken
-			state.IsAuthenticated = true
-		}
-		if refreshToken, ok := v["refresh_token"].(string); ok {
-			state.RefreshToken = refreshToken
-		}
-		if expiresIn, ok := v["expires_in"].(float64); ok {
-			state.ExpiresAt = time.Now().Add(time.Duration(expiresIn) * time.Second)
-		}
-	}
-
-	return r.vm.ToValue(true)
-}
-
-func (r *ExtensionRuntime) authClear(call goja.FunctionCall) goja.Value {
-	extensionAuthStateMu.Lock()
-	delete(extensionAuthState, r.extensionID)
-	extensionAuthStateMu.Unlock()
-
-	pendingAuthRequestsMu.Lock()
-	delete(pendingAuthRequests, r.extensionID)
-	pendingAuthRequestsMu.Unlock()
-
-	GoLog("[Extension:%s] Auth state cleared\n", r.extensionID)
-	return r.vm.ToValue(true)
-}
-
-func (r *ExtensionRuntime) authIsAuthenticated(call goja.FunctionCall) goja.Value {
-	extensionAuthStateMu.RLock()
-	defer extensionAuthStateMu.RUnlock()
-
-	state, exists := extensionAuthState[r.extensionID]
-	if !exists {
-		return r.vm.ToValue(false)
-	}
-
-	if state.IsAuthenticated && !state.ExpiresAt.IsZero() && time.Now().After(state.ExpiresAt) {
-		return r.vm.ToValue(false)
-	}
-
-	return r.vm.ToValue(state.IsAuthenticated)
-}
-
-func (r *ExtensionRuntime) authGetTokens(call goja.FunctionCall) goja.Value {
-	extensionAuthStateMu.RLock()
-	defer extensionAuthStateMu.RUnlock()
-
-	state, exists := extensionAuthState[r.extensionID]
-	if !exists {
-		return r.vm.ToValue(map[string]interface{}{})
-	}
-
-	result := map[string]interface{}{
-		"access_token":     state.AccessToken,
-		"refresh_token":    state.RefreshToken,
-		"is_authenticated": state.IsAuthenticated,
-	}
-
-	if !state.ExpiresAt.IsZero() {
-		result["expires_at"] = state.ExpiresAt.Unix()
-		result["is_expired"] = time.Now().After(state.ExpiresAt)
-	}
-
-	return r.vm.ToValue(result)
-}
-
-// ==================== PKCE Support ====================
-
-// generatePKCEVerifier generates a cryptographically random code verifier
-// Length should be between 43-128 characters (RFC 7636)
-func generatePKCEVerifier(length int) (string, error) {
-	if length < 43 {
-		length = 43
-	}
-	if length > 128 {
-		length = 128
-	}
-
-	bytes := make([]byte, length)
-	if _, err := rand.Read(bytes); err != nil {
-		return "", err
-	}
-
-	verifier := base64.RawURLEncoding.EncodeToString(bytes)
-
-	if len(verifier) > length {
-		verifier = verifier[:length]
-	}
-
-	return verifier, nil
-}
-
-func generatePKCEChallenge(verifier string) string {
-	hash := sha256.Sum256([]byte(verifier))
-	// Base64url encode without padding (RFC 7636)
-	return base64.RawURLEncoding.EncodeToString(hash[:])
-}
-
-func (r *ExtensionRuntime) authGeneratePKCE(call goja.FunctionCall) goja.Value {
-	length := 64
-	if len(call.Arguments) > 0 && !goja.IsUndefined(call.Arguments[0]) {
-		if l, ok := call.Arguments[0].Export().(float64); ok && l >= 43 && l <= 128 {
-			length = int(l)
-		}
-	}
-
-	verifier, err := generatePKCEVerifier(length)
-	if err != nil {
-		GoLog("[Extension:%s] PKCE generation error: %v\n", r.extensionID, err)
-		return r.vm.ToValue(map[string]interface{}{
-			"error": err.Error(),
-		})
-	}
-
-	challenge := generatePKCEChallenge(verifier)
-
-	extensionAuthStateMu.Lock()
-	state, exists := extensionAuthState[r.extensionID]
-	if !exists {
-		state = &ExtensionAuthState{}
-		extensionAuthState[r.extensionID] = state
-	}
-	state.PKCEVerifier = verifier
-	state.PKCEChallenge = challenge
-	extensionAuthStateMu.Unlock()
-
-	GoLog("[Extension:%s] PKCE generated (verifier length: %d)\n", r.extensionID, len(verifier))
-
-	return r.vm.ToValue(map[string]interface{}{
-		"verifier":  verifier,
-		"challenge": challenge,
-		"method":    "S256",
-	})
-}
-
-func (r *ExtensionRuntime) authGetPKCE(call goja.FunctionCall) goja.Value {
-	extensionAuthStateMu.RLock()
-	defer extensionAuthStateMu.RUnlock()
-
-	state, exists := extensionAuthState[r.extensionID]
-	if !exists || state.PKCEVerifier == "" {
-		return r.vm.ToValue(map[string]interface{}{})
-	}
-
-	return r.vm.ToValue(map[string]interface{}{
-		"verifier":  state.PKCEVerifier,
-		"challenge": state.PKCEChallenge,
-		"method":    "S256",
-	})
-}
-
-// config: { authUrl, clientId, redirectUri, scope, extraParams }
-func (r *ExtensionRuntime) authStartOAuthWithPKCE(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   "config object is required",
-		})
-	}
-
-	configObj := call.Arguments[0].Export()
-	config, ok := configObj.(map[string]interface{})
-	if !ok {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   "config must be an object",
-		})
-	}
-
-	authURL, _ := config["authUrl"].(string)
-	clientID, _ := config["clientId"].(string)
-	redirectURI, _ := config["redirectUri"].(string)
-
-	if authURL == "" || clientID == "" || redirectURI == "" {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   "authUrl, clientId, and redirectUri are required",
-		})
-	}
-
-	scope, _ := config["scope"].(string)
-	extraParams, _ := config["extraParams"].(map[string]interface{})
-
-	verifier, err := generatePKCEVerifier(64)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   fmt.Sprintf("failed to generate PKCE: %v", err),
-		})
-	}
-	challenge := generatePKCEChallenge(verifier)
-
-	extensionAuthStateMu.Lock()
-	state, exists := extensionAuthState[r.extensionID]
-	if !exists {
-		state = &ExtensionAuthState{}
-		extensionAuthState[r.extensionID] = state
-	}
-	state.PKCEVerifier = verifier
-	state.PKCEChallenge = challenge
-	state.AuthCode = ""
-	extensionAuthStateMu.Unlock()
-
-	parsedURL, err := url.Parse(authURL)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   fmt.Sprintf("invalid authUrl: %v", err),
-		})
-	}
-
-	query := parsedURL.Query()
-	query.Set("client_id", clientID)
-	query.Set("redirect_uri", redirectURI)
-	query.Set("response_type", "code")
-	query.Set("code_challenge", challenge)
-	query.Set("code_challenge_method", "S256")
-
-	if scope != "" {
-		query.Set("scope", scope)
-	}
-
-	for k, v := range extraParams {
-		query.Set(k, fmt.Sprintf("%v", v))
-	}
-
-	parsedURL.RawQuery = query.Encode()
-	fullAuthURL := parsedURL.String()
-
-	pendingAuthRequestsMu.Lock()
-	pendingAuthRequests[r.extensionID] = &PendingAuthRequest{
-		ExtensionID: r.extensionID,
-		AuthURL:     fullAuthURL,
-		CallbackURL: redirectURI,
-	}
-	pendingAuthRequestsMu.Unlock()
-
-	GoLog("[Extension:%s] PKCE OAuth started: %s\n", r.extensionID, fullAuthURL)
-
-	return r.vm.ToValue(map[string]interface{}{
-		"success": true,
-		"authUrl": fullAuthURL,
-		"pkce": map[string]interface{}{
-			"verifier":  verifier,
-			"challenge": challenge,
-			"method":    "S256",
-		},
-	})
-}
-
-// authExchangeCodeWithPKCE exchanges auth code for tokens using PKCE
-// config: { tokenUrl, clientId, redirectUri, code, extraParams }
-// Uses the stored PKCE verifier automatically
-func (r *ExtensionRuntime) authExchangeCodeWithPKCE(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   "config object is required",
-		})
-	}
-
-	configObj := call.Arguments[0].Export()
-	config, ok := configObj.(map[string]interface{})
-	if !ok {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   "config must be an object",
-		})
-	}
-
-	// Required fields
-	tokenURL, _ := config["tokenUrl"].(string)
-	clientID, _ := config["clientId"].(string)
-	redirectURI, _ := config["redirectUri"].(string)
-	code, _ := config["code"].(string)
-
-	if tokenURL == "" || clientID == "" || code == "" {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   "tokenUrl, clientId, and code are required",
-		})
-	}
-
-	extensionAuthStateMu.RLock()
-	state, exists := extensionAuthState[r.extensionID]
-	var verifier string
-	if exists {
-		verifier = state.PKCEVerifier
-	}
-	extensionAuthStateMu.RUnlock()
-
-	if verifier == "" {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   "no PKCE verifier found - call generatePKCE or startOAuthWithPKCE first",
-		})
-	}
-
-	if err := r.validateDomain(tokenURL); err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   err.Error(),
-		})
-	}
-
-	formData := url.Values{}
-	formData.Set("grant_type", "authorization_code")
-	formData.Set("client_id", clientID)
-	formData.Set("code", code)
-	formData.Set("code_verifier", verifier)
-	if redirectURI != "" {
-		formData.Set("redirect_uri", redirectURI)
-	}
-
-	if extraParams, ok := config["extraParams"].(map[string]interface{}); ok {
-		for k, v := range extraParams {
-			formData.Set(k, fmt.Sprintf("%v", v))
-		}
-	}
-
-	req, err := http.NewRequest("POST", tokenURL, strings.NewReader(formData.Encode()))
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   err.Error(),
-		})
-	}
-
-	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
-	req.Header.Set("User-Agent", "SpotiFLAC-Extension/1.0")
-
-	resp, err := r.httpClient.Do(req)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   err.Error(),
-		})
-	}
-	defer resp.Body.Close()
-
-	body, err := io.ReadAll(resp.Body)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   err.Error(),
-		})
-	}
-
-	var tokenResp map[string]interface{}
-	if err := json.Unmarshal(body, &tokenResp); err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   fmt.Sprintf("failed to parse token response: %v", err),
-			"body":    string(body),
-		})
-	}
-
-	if errMsg, ok := tokenResp["error"].(string); ok {
-		errDesc, _ := tokenResp["error_description"].(string)
-		return r.vm.ToValue(map[string]interface{}{
-			"success":           false,
-			"error":             errMsg,
-			"error_description": errDesc,
-		})
-	}
-
-	accessToken, _ := tokenResp["access_token"].(string)
-	refreshToken, _ := tokenResp["refresh_token"].(string)
-	expiresIn, _ := tokenResp["expires_in"].(float64)
-
-	if accessToken == "" {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   "no access_token in response",
-			"body":    string(body),
-		})
-	}
-
-	extensionAuthStateMu.Lock()
-	state, exists = extensionAuthState[r.extensionID]
-	if !exists {
-		state = &ExtensionAuthState{}
-		extensionAuthState[r.extensionID] = state
-	}
-	state.AccessToken = accessToken
-	state.RefreshToken = refreshToken
-	state.IsAuthenticated = true
-	if expiresIn > 0 {
-		state.ExpiresAt = time.Now().Add(time.Duration(expiresIn) * time.Second)
-	}
-	state.PKCEVerifier = ""
-	state.PKCEChallenge = ""
-	extensionAuthStateMu.Unlock()
-
-	GoLog("[Extension:%s] PKCE token exchange successful\n", r.extensionID)
-
-	result := map[string]interface{}{
-		"success":       true,
-		"access_token":  accessToken,
-		"refresh_token": refreshToken,
-		"token_type":    tokenResp["token_type"],
-	}
-	if expiresIn > 0 {
-		result["expires_in"] = expiresIn
-	}
-	if scope, ok := tokenResp["scope"].(string); ok {
-		result["scope"] = scope
-	}
-
-	return r.vm.ToValue(result)
-}

go_backend/extension_runtime_ffmpeg.go

@@ -1,186 +0,0 @@
-// Package gobackend provides FFmpeg API for extension runtime
-package gobackend
-
-import (
-	"fmt"
-	"strings"
-	"sync"
-	"time"
-
-	"github.com/dop251/goja"
-)
-
-// ==================== FFmpeg API (Post-Processing) ====================
-
-// FFmpegCommand holds a pending FFmpeg command for Flutter to execute
-type FFmpegCommand struct {
-	ExtensionID string
-	Command     string
-	InputPath   string
-	OutputPath  string
-	Completed   bool
-	Success     bool
-	Error       string
-	Output      string
-}
-
-// Global FFmpeg command queue
-var (
-	ffmpegCommands   = make(map[string]*FFmpegCommand)
-	ffmpegCommandsMu sync.RWMutex
-	ffmpegCommandID  int64
-)
-
-func GetPendingFFmpegCommand(commandID string) *FFmpegCommand {
-	ffmpegCommandsMu.RLock()
-	defer ffmpegCommandsMu.RUnlock()
-	return ffmpegCommands[commandID]
-}
-
-func SetFFmpegCommandResult(commandID string, success bool, output, errorMsg string) {
-	ffmpegCommandsMu.Lock()
-	defer ffmpegCommandsMu.Unlock()
-	if cmd, exists := ffmpegCommands[commandID]; exists {
-		cmd.Completed = true
-		cmd.Success = success
-		cmd.Output = output
-		cmd.Error = errorMsg
-	}
-}
-
-func ClearFFmpegCommand(commandID string) {
-	ffmpegCommandsMu.Lock()
-	defer ffmpegCommandsMu.Unlock()
-	delete(ffmpegCommands, commandID)
-}
-
-func (r *ExtensionRuntime) ffmpegExecute(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   "command is required",
-		})
-	}
-
-	command := call.Arguments[0].String()
-
-	ffmpegCommandsMu.Lock()
-	ffmpegCommandID++
-	cmdID := fmt.Sprintf("%s_%d", r.extensionID, ffmpegCommandID)
-	ffmpegCommands[cmdID] = &FFmpegCommand{
-		ExtensionID: r.extensionID,
-		Command:     command,
-		Completed:   false,
-	}
-	ffmpegCommandsMu.Unlock()
-
-	GoLog("[Extension:%s] FFmpeg command queued: %s\n", r.extensionID, cmdID)
-
-	timeout := 5 * time.Minute
-	start := time.Now()
-	for {
-		ffmpegCommandsMu.RLock()
-		cmd := ffmpegCommands[cmdID]
-		completed := cmd != nil && cmd.Completed
-		ffmpegCommandsMu.RUnlock()
-
-		if completed {
-			ffmpegCommandsMu.RLock()
-			result := map[string]interface{}{
-				"success": cmd.Success,
-				"output":  cmd.Output,
-			}
-			if cmd.Error != "" {
-				result["error"] = cmd.Error
-			}
-			ffmpegCommandsMu.RUnlock()
-
-			ClearFFmpegCommand(cmdID)
-			return r.vm.ToValue(result)
-		}
-
-		if time.Since(start) > timeout {
-			ClearFFmpegCommand(cmdID)
-			return r.vm.ToValue(map[string]interface{}{
-				"success": false,
-				"error":   "FFmpeg command timed out",
-			})
-		}
-
-		time.Sleep(100 * time.Millisecond)
-	}
-}
-
-func (r *ExtensionRuntime) ffmpegGetInfo(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   "file path is required",
-		})
-	}
-
-	filePath := call.Arguments[0].String()
-
-	quality, err := GetAudioQuality(filePath)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   err.Error(),
-		})
-	}
-
-	return r.vm.ToValue(map[string]interface{}{
-		"success":       true,
-		"bit_depth":     quality.BitDepth,
-		"sample_rate":   quality.SampleRate,
-		"total_samples": quality.TotalSamples,
-		"duration":      float64(quality.TotalSamples) / float64(quality.SampleRate),
-	})
-}
-
-func (r *ExtensionRuntime) ffmpegConvert(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 2 {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   "input and output paths are required",
-		})
-	}
-
-	inputPath := call.Arguments[0].String()
-	outputPath := call.Arguments[1].String()
-
-	options := map[string]interface{}{}
-	if len(call.Arguments) > 2 && !goja.IsUndefined(call.Arguments[2]) && !goja.IsNull(call.Arguments[2]) {
-		if opts, ok := call.Arguments[2].Export().(map[string]interface{}); ok {
-			options = opts
-		}
-	}
-
-	var cmdParts []string
-	cmdParts = append(cmdParts, "-i", fmt.Sprintf("%q", inputPath))
-
-	if codec, ok := options["codec"].(string); ok {
-		cmdParts = append(cmdParts, "-c:a", codec)
-	}
-
-	if bitrate, ok := options["bitrate"].(string); ok {
-		cmdParts = append(cmdParts, "-b:a", bitrate)
-	}
-
-	if sampleRate, ok := options["sample_rate"].(float64); ok {
-		cmdParts = append(cmdParts, "-ar", fmt.Sprintf("%d", int(sampleRate)))
-	}
-
-	if channels, ok := options["channels"].(float64); ok {
-		cmdParts = append(cmdParts, "-ac", fmt.Sprintf("%d", int(channels)))
-	}
-
-	cmdParts = append(cmdParts, "-y", fmt.Sprintf("%q", outputPath))
-
-	command := strings.Join(cmdParts, " ")
-
-	execCall := goja.FunctionCall{
-		Arguments: []goja.Value{r.vm.ToValue(command)},
-	}
-	return r.ffmpegExecute(execCall)
-}

go_backend/extension_runtime_file.go

@@ -1,505 +0,0 @@
-// Package gobackend provides File API for extension runtime
-package gobackend
-
-import (
-	"fmt"
-	"io"
-	"net/http"
-	"os"
-	"path/filepath"
-	"strings"
-	"sync"
-
-	"github.com/dop251/goja"
-)
-
-// ==================== File API (Sandboxed) ====================
-
-var (
-	allowedDownloadDirs   []string
-	allowedDownloadDirsMu sync.RWMutex
-)
-
-func SetAllowedDownloadDirs(dirs []string) {
-	allowedDownloadDirsMu.Lock()
-	defer allowedDownloadDirsMu.Unlock()
-	allowedDownloadDirs = dirs
-	GoLog("[Extension] Allowed download directories set: %v\n", dirs)
-}
-
-func AddAllowedDownloadDir(dir string) {
-	allowedDownloadDirsMu.Lock()
-	defer allowedDownloadDirsMu.Unlock()
-	absDir, err := filepath.Abs(dir)
-	if err == nil {
-		allowedDownloadDirs = append(allowedDownloadDirs, absDir)
-	}
-}
-
-func isPathInAllowedDirs(absPath string) bool {
-	allowedDownloadDirsMu.RLock()
-	defer allowedDownloadDirsMu.RUnlock()
-
-	for _, allowedDir := range allowedDownloadDirs {
-		if isPathWithinBase(allowedDir, absPath) {
-			return true
-		}
-	}
-	return false
-}
-
-func isPathWithinBase(baseDir, targetPath string) bool {
-	baseAbs, err := filepath.Abs(baseDir)
-	if err != nil {
-		return false
-	}
-	targetAbs, err := filepath.Abs(targetPath)
-	if err != nil {
-		return false
-	}
-
-	rel, err := filepath.Rel(baseAbs, targetAbs)
-	if err != nil {
-		return false
-	}
-	rel = filepath.Clean(rel)
-	if rel == "." {
-		return true
-	}
-
-	prefix := ".." + string(filepath.Separator)
-	if rel == ".." || strings.HasPrefix(rel, prefix) {
-		return false
-	}
-	return true
-}
-
-func (r *ExtensionRuntime) validatePath(path string) (string, error) {
-	if !r.manifest.Permissions.File {
-		return "", fmt.Errorf("file access denied: extension does not have 'file' permission")
-	}
-
-	cleanPath := filepath.Clean(path)
-
-	if filepath.IsAbs(cleanPath) {
-		absPath, err := filepath.Abs(cleanPath)
-		if err != nil {
-			return "", fmt.Errorf("invalid path: %w", err)
-		}
-
-		if isPathInAllowedDirs(absPath) {
-			return absPath, nil
-		}
-
-		return "", fmt.Errorf("file access denied: absolute paths are not allowed. Use relative paths within extension sandbox")
-	}
-
-	fullPath := filepath.Join(r.dataDir, cleanPath)
-
-	absPath, err := filepath.Abs(fullPath)
-	if err != nil {
-		return "", fmt.Errorf("invalid path: %w", err)
-	}
-
-	absDataDir, _ := filepath.Abs(r.dataDir)
-	if !isPathWithinBase(absDataDir, absPath) {
-		return "", fmt.Errorf("file access denied: path '%s' is outside sandbox", path)
-	}
-
-	return absPath, nil
-}
-
-func (r *ExtensionRuntime) fileDownload(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 2 {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   "URL and output path are required",
-		})
-	}
-
-	urlStr := call.Arguments[0].String()
-	outputPath := call.Arguments[1].String()
-
-	if err := r.validateDomain(urlStr); err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   err.Error(),
-		})
-	}
-
-	fullPath, err := r.validatePath(outputPath)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   err.Error(),
-		})
-	}
-
-	var onProgress goja.Callable
-	var headers map[string]string
-	if len(call.Arguments) > 2 && !goja.IsUndefined(call.Arguments[2]) && !goja.IsNull(call.Arguments[2]) {
-		optionsObj := call.Arguments[2].Export()
-		if opts, ok := optionsObj.(map[string]interface{}); ok {
-			if h, ok := opts["headers"].(map[string]interface{}); ok {
-				headers = make(map[string]string)
-				for k, v := range h {
-					headers[k] = fmt.Sprintf("%v", v)
-				}
-			}
-			if progressVal, ok := opts["onProgress"]; ok {
-				if callable, ok := goja.AssertFunction(r.vm.ToValue(progressVal)); ok {
-					onProgress = callable
-				}
-			}
-		}
-	}
-
-	dir := filepath.Dir(fullPath)
-	if err := os.MkdirAll(dir, 0755); err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   fmt.Sprintf("failed to create directory: %v", err),
-		})
-	}
-
-	req, err := http.NewRequest("GET", urlStr, nil)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   err.Error(),
-		})
-	}
-
-	for k, v := range headers {
-		req.Header.Set(k, v)
-	}
-	if req.Header.Get("User-Agent") == "" {
-		req.Header.Set("User-Agent", "SpotiFLAC-Extension/1.0")
-	}
-
-	resp, err := r.httpClient.Do(req)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   err.Error(),
-		})
-	}
-	defer resp.Body.Close()
-
-	if resp.StatusCode != 200 {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   fmt.Sprintf("HTTP error: %d", resp.StatusCode),
-		})
-	}
-
-	out, err := os.Create(fullPath)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   fmt.Sprintf("failed to create file: %v", err),
-		})
-	}
-	defer out.Close()
-
-	contentLength := resp.ContentLength
-
-	var written int64
-	buf := make([]byte, 32*1024)
-	for {
-		nr, er := resp.Body.Read(buf)
-		if nr > 0 {
-			nw, ew := out.Write(buf[0:nr])
-			if nw < 0 || nr < nw {
-				nw = 0
-				if ew == nil {
-					ew = fmt.Errorf("invalid write result")
-				}
-			}
-			written += int64(nw)
-			if ew != nil {
-				return r.vm.ToValue(map[string]interface{}{
-					"success": false,
-					"error":   fmt.Sprintf("failed to write file: %v", ew),
-				})
-			}
-			if nr != nw {
-				return r.vm.ToValue(map[string]interface{}{
-					"success": false,
-					"error":   "short write",
-				})
-			}
-
-			if onProgress != nil && contentLength > 0 {
-				_, _ = onProgress(goja.Undefined(), r.vm.ToValue(written), r.vm.ToValue(contentLength))
-			}
-		}
-		if er != nil {
-			if er != io.EOF {
-				return r.vm.ToValue(map[string]interface{}{
-					"success": false,
-					"error":   fmt.Sprintf("failed to read response: %v", er),
-				})
-			}
-			break
-		}
-	}
-
-	GoLog("[Extension:%s] Downloaded %d bytes to %s\n", r.extensionID, written, fullPath)
-
-	return r.vm.ToValue(map[string]interface{}{
-		"success": true,
-		"path":    fullPath,
-		"size":    written,
-	})
-}
-
-func (r *ExtensionRuntime) fileExists(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue(false)
-	}
-
-	path := call.Arguments[0].String()
-	fullPath, err := r.validatePath(path)
-	if err != nil {
-		return r.vm.ToValue(false)
-	}
-
-	_, err = os.Stat(fullPath)
-	return r.vm.ToValue(err == nil)
-}
-
-func (r *ExtensionRuntime) fileDelete(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   "path is required",
-		})
-	}
-
-	path := call.Arguments[0].String()
-	fullPath, err := r.validatePath(path)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   err.Error(),
-		})
-	}
-
-	if err := os.Remove(fullPath); err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   err.Error(),
-		})
-	}
-
-	return r.vm.ToValue(map[string]interface{}{
-		"success": true,
-	})
-}
-
-func (r *ExtensionRuntime) fileRead(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   "path is required",
-		})
-	}
-
-	path := call.Arguments[0].String()
-	fullPath, err := r.validatePath(path)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   err.Error(),
-		})
-	}
-
-	data, err := os.ReadFile(fullPath)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   err.Error(),
-		})
-	}
-
-	return r.vm.ToValue(map[string]interface{}{
-		"success": true,
-		"data":    string(data),
-	})
-}
-
-func (r *ExtensionRuntime) fileWrite(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 2 {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   "path and data are required",
-		})
-	}
-
-	path := call.Arguments[0].String()
-	data := call.Arguments[1].String()
-
-	fullPath, err := r.validatePath(path)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   err.Error(),
-		})
-	}
-
-	dir := filepath.Dir(fullPath)
-	if err := os.MkdirAll(dir, 0755); err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   fmt.Sprintf("failed to create directory: %v", err),
-		})
-	}
-
-	if err := os.WriteFile(fullPath, []byte(data), 0644); err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   err.Error(),
-		})
-	}
-
-	return r.vm.ToValue(map[string]interface{}{
-		"success": true,
-		"path":    fullPath,
-	})
-}
-
-func (r *ExtensionRuntime) fileCopy(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 2 {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   "source and destination paths are required",
-		})
-	}
-
-	srcPath := call.Arguments[0].String()
-	dstPath := call.Arguments[1].String()
-
-	fullSrc, err := r.validatePath(srcPath)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   err.Error(),
-		})
-	}
-
-	fullDst, err := r.validatePath(dstPath)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   err.Error(),
-		})
-	}
-
-	data, err := os.ReadFile(fullSrc)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   fmt.Sprintf("failed to read source: %v", err),
-		})
-	}
-
-	dir := filepath.Dir(fullDst)
-	if err := os.MkdirAll(dir, 0755); err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   fmt.Sprintf("failed to create directory: %v", err),
-		})
-	}
-
-	if err := os.WriteFile(fullDst, data, 0644); err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   fmt.Sprintf("failed to write destination: %v", err),
-		})
-	}
-
-	return r.vm.ToValue(map[string]interface{}{
-		"success": true,
-		"path":    fullDst,
-	})
-}
-
-func (r *ExtensionRuntime) fileMove(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 2 {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   "source and destination paths are required",
-		})
-	}
-
-	srcPath := call.Arguments[0].String()
-	dstPath := call.Arguments[1].String()
-
-	fullSrc, err := r.validatePath(srcPath)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   err.Error(),
-		})
-	}
-
-	fullDst, err := r.validatePath(dstPath)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   err.Error(),
-		})
-	}
-
-	dir := filepath.Dir(fullDst)
-	if err := os.MkdirAll(dir, 0755); err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   fmt.Sprintf("failed to create directory: %v", err),
-		})
-	}
-
-	if err := os.Rename(fullSrc, fullDst); err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   fmt.Sprintf("failed to move file: %v", err),
-		})
-	}
-
-	return r.vm.ToValue(map[string]interface{}{
-		"success": true,
-		"path":    fullDst,
-	})
-}
-
-func (r *ExtensionRuntime) fileGetSize(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   "path is required",
-		})
-	}
-
-	path := call.Arguments[0].String()
-	fullPath, err := r.validatePath(path)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   err.Error(),
-		})
-	}
-
-	info, err := os.Stat(fullPath)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   err.Error(),
-		})
-	}
-
-	return r.vm.ToValue(map[string]interface{}{
-		"success": true,
-		"size":    info.Size(),
-	})
-}

go_backend/extension_runtime_http.go

@@ -1,463 +0,0 @@
-// Package gobackend provides HTTP API for extension runtime
-package gobackend
-
-import (
-	"encoding/json"
-	"fmt"
-	"io"
-	"net/http"
-	"net/url"
-	"strings"
-
-	"github.com/dop251/goja"
-)
-
-// ==================== HTTP API (Sandboxed) ====================
-
-type HTTPResponse struct {
-	StatusCode int               `json:"statusCode"`
-	Body       string            `json:"body"`
-	Headers    map[string]string `json:"headers"`
-}
-
-func (r *ExtensionRuntime) validateDomain(urlStr string) error {
-	parsed, err := url.Parse(urlStr)
-	if err != nil {
-		return fmt.Errorf("invalid URL: %w", err)
-	}
-
-	if parsed.Scheme == "" {
-		return fmt.Errorf("invalid URL: scheme is required")
-	}
-	if parsed.Scheme != "https" {
-		return fmt.Errorf("network access denied: only https is allowed")
-	}
-
-	domain := parsed.Hostname()
-	if domain == "" {
-		return fmt.Errorf("invalid URL: hostname is required")
-	}
-
-	if isPrivateIP(domain) {
-		return fmt.Errorf("network access denied: private/local network '%s' not allowed", domain)
-	}
-
-	if !r.manifest.IsDomainAllowed(domain) {
-		return fmt.Errorf("network access denied: domain '%s' not in allowed list", domain)
-	}
-
-	return nil
-}
-
-func (r *ExtensionRuntime) httpGet(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue(map[string]interface{}{
-			"error": "URL is required",
-		})
-	}
-
-	urlStr := call.Arguments[0].String()
-
-	if err := r.validateDomain(urlStr); err != nil {
-		GoLog("[Extension:%s] HTTP blocked: %v\n", r.extensionID, err)
-		return r.vm.ToValue(map[string]interface{}{
-			"error": err.Error(),
-		})
-	}
-
-	headers := make(map[string]string)
-	if len(call.Arguments) > 1 && !goja.IsUndefined(call.Arguments[1]) && !goja.IsNull(call.Arguments[1]) {
-		headersObj := call.Arguments[1].Export()
-		if h, ok := headersObj.(map[string]interface{}); ok {
-			for k, v := range h {
-				headers[k] = fmt.Sprintf("%v", v)
-			}
-		}
-	}
-
-	req, err := http.NewRequest("GET", urlStr, nil)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"error": err.Error(),
-		})
-	}
-
-	for k, v := range headers {
-		req.Header.Set(k, v)
-	}
-
-	if req.Header.Get("User-Agent") == "" {
-		req.Header.Set("User-Agent", "Spotiflac-Extension/1.0")
-	}
-
-	resp, err := r.httpClient.Do(req)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"error": err.Error(),
-		})
-	}
-	defer resp.Body.Close()
-
-	body, err := io.ReadAll(resp.Body)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"error": err.Error(),
-		})
-	}
-
-	respHeaders := make(map[string]interface{})
-	for k, v := range resp.Header {
-		if len(v) == 1 {
-			respHeaders[k] = v[0]
-		} else {
-			respHeaders[k] = v
-		}
-	}
-
-	return r.vm.ToValue(map[string]interface{}{
-		"statusCode": resp.StatusCode,
-		"status":     resp.StatusCode,
-		"ok":         resp.StatusCode >= 200 && resp.StatusCode < 300,
-		"body":       string(body),
-		"headers":    respHeaders,
-	})
-}
-
-func (r *ExtensionRuntime) httpPost(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue(map[string]interface{}{
-			"error": "URL is required",
-		})
-	}
-
-	urlStr := call.Arguments[0].String()
-
-	if err := r.validateDomain(urlStr); err != nil {
-		GoLog("[Extension:%s] HTTP blocked: %v\n", r.extensionID, err)
-		return r.vm.ToValue(map[string]interface{}{
-			"error": err.Error(),
-		})
-	}
-
-	var bodyStr string
-	if len(call.Arguments) > 1 && !goja.IsUndefined(call.Arguments[1]) && !goja.IsNull(call.Arguments[1]) {
-		bodyArg := call.Arguments[1].Export()
-		switch v := bodyArg.(type) {
-		case string:
-			bodyStr = v
-		case map[string]interface{}, []interface{}:
-			jsonBytes, err := json.Marshal(v)
-			if err != nil {
-				return r.vm.ToValue(map[string]interface{}{
-					"error": fmt.Sprintf("failed to stringify body: %v", err),
-				})
-			}
-			bodyStr = string(jsonBytes)
-		default:
-			bodyStr = call.Arguments[1].String()
-		}
-	}
-
-	headers := make(map[string]string)
-	if len(call.Arguments) > 2 && !goja.IsUndefined(call.Arguments[2]) && !goja.IsNull(call.Arguments[2]) {
-		headersObj := call.Arguments[2].Export()
-		if h, ok := headersObj.(map[string]interface{}); ok {
-			for k, v := range h {
-				headers[k] = fmt.Sprintf("%v", v)
-			}
-		}
-	}
-
-	req, err := http.NewRequest("POST", urlStr, strings.NewReader(bodyStr))
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"error": err.Error(),
-		})
-	}
-
-	for k, v := range headers {
-		req.Header.Set(k, v)
-	}
-
-	if req.Header.Get("User-Agent") == "" {
-		req.Header.Set("User-Agent", "Spotiflac-Extension/1.0")
-	}
-	if req.Header.Get("Content-Type") == "" {
-		req.Header.Set("Content-Type", "application/json")
-	}
-
-	resp, err := r.httpClient.Do(req)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"error": err.Error(),
-		})
-	}
-	defer resp.Body.Close()
-
-	body, err := io.ReadAll(resp.Body)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"error": err.Error(),
-		})
-	}
-
-	respHeaders := make(map[string]interface{})
-	for k, v := range resp.Header {
-		if len(v) == 1 {
-			respHeaders[k] = v[0]
-		} else {
-			respHeaders[k] = v
-		}
-	}
-
-	return r.vm.ToValue(map[string]interface{}{
-		"statusCode": resp.StatusCode,
-		"status":     resp.StatusCode,
-		"ok":         resp.StatusCode >= 200 && resp.StatusCode < 300,
-		"body":       string(body),
-		"headers":    respHeaders,
-	})
-}
-
-func (r *ExtensionRuntime) httpRequest(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue(map[string]interface{}{
-			"error": "URL is required",
-		})
-	}
-
-	urlStr := call.Arguments[0].String()
-
-	if err := r.validateDomain(urlStr); err != nil {
-		GoLog("[Extension:%s] HTTP blocked: %v\n", r.extensionID, err)
-		return r.vm.ToValue(map[string]interface{}{
-			"error": err.Error(),
-		})
-	}
-
-	method := "GET"
-	var bodyStr string
-	headers := make(map[string]string)
-
-	if len(call.Arguments) > 1 && !goja.IsUndefined(call.Arguments[1]) && !goja.IsNull(call.Arguments[1]) {
-		optionsObj := call.Arguments[1].Export()
-		if opts, ok := optionsObj.(map[string]interface{}); ok {
-			if m, ok := opts["method"].(string); ok {
-				method = strings.ToUpper(m)
-			}
-
-			if bodyArg, ok := opts["body"]; ok && bodyArg != nil {
-				switch v := bodyArg.(type) {
-				case string:
-					bodyStr = v
-				case map[string]interface{}, []interface{}:
-					jsonBytes, err := json.Marshal(v)
-					if err != nil {
-						return r.vm.ToValue(map[string]interface{}{
-							"error": fmt.Sprintf("failed to stringify body: %v", err),
-						})
-					}
-					bodyStr = string(jsonBytes)
-				default:
-					bodyStr = fmt.Sprintf("%v", v)
-				}
-			}
-
-			if h, ok := opts["headers"].(map[string]interface{}); ok {
-				for k, v := range h {
-					headers[k] = fmt.Sprintf("%v", v)
-				}
-			}
-		}
-	}
-
-	var reqBody io.Reader
-	if bodyStr != "" {
-		reqBody = strings.NewReader(bodyStr)
-	}
-
-	req, err := http.NewRequest(method, urlStr, reqBody)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"error": err.Error(),
-		})
-	}
-
-	for k, v := range headers {
-		req.Header.Set(k, v)
-	}
-
-	if req.Header.Get("User-Agent") == "" {
-		req.Header.Set("User-Agent", "Spotiflac-Extension/1.0")
-	}
-	if bodyStr != "" && req.Header.Get("Content-Type") == "" {
-		req.Header.Set("Content-Type", "application/json")
-	}
-
-	resp, err := r.httpClient.Do(req)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"error": err.Error(),
-		})
-	}
-	defer resp.Body.Close()
-
-	body, err := io.ReadAll(resp.Body)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"error": err.Error(),
-		})
-	}
-
-	respHeaders := make(map[string]interface{})
-	for k, v := range resp.Header {
-		if len(v) == 1 {
-			respHeaders[k] = v[0]
-		} else {
-			respHeaders[k] = v
-		}
-	}
-
-	return r.vm.ToValue(map[string]interface{}{
-		"statusCode": resp.StatusCode,
-		"status":     resp.StatusCode,
-		"ok":         resp.StatusCode >= 200 && resp.StatusCode < 300,
-		"body":       string(body),
-		"headers":    respHeaders,
-	})
-}
-
-func (r *ExtensionRuntime) httpPut(call goja.FunctionCall) goja.Value {
-	return r.httpMethodShortcut("PUT", call)
-}
-
-func (r *ExtensionRuntime) httpDelete(call goja.FunctionCall) goja.Value {
-	return r.httpMethodShortcut("DELETE", call)
-}
-
-func (r *ExtensionRuntime) httpPatch(call goja.FunctionCall) goja.Value {
-	return r.httpMethodShortcut("PATCH", call)
-}
-
-func (r *ExtensionRuntime) httpMethodShortcut(method string, call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue(map[string]interface{}{
-			"error": "URL is required",
-		})
-	}
-
-	urlStr := call.Arguments[0].String()
-
-	if err := r.validateDomain(urlStr); err != nil {
-		GoLog("[Extension:%s] HTTP blocked: %v\n", r.extensionID, err)
-		return r.vm.ToValue(map[string]interface{}{
-			"error": err.Error(),
-		})
-	}
-
-	var bodyStr string
-	headers := make(map[string]string)
-
-	if method == "DELETE" {
-		if len(call.Arguments) > 1 && !goja.IsUndefined(call.Arguments[1]) && !goja.IsNull(call.Arguments[1]) {
-			headersObj := call.Arguments[1].Export()
-			if h, ok := headersObj.(map[string]interface{}); ok {
-				for k, v := range h {
-					headers[k] = fmt.Sprintf("%v", v)
-				}
-			}
-		}
-	} else {
-		if len(call.Arguments) > 1 && !goja.IsUndefined(call.Arguments[1]) && !goja.IsNull(call.Arguments[1]) {
-			bodyArg := call.Arguments[1].Export()
-			switch v := bodyArg.(type) {
-			case string:
-				bodyStr = v
-			case map[string]interface{}, []interface{}:
-				jsonBytes, err := json.Marshal(v)
-				if err != nil {
-					return r.vm.ToValue(map[string]interface{}{
-						"error": fmt.Sprintf("failed to stringify body: %v", err),
-					})
-				}
-				bodyStr = string(jsonBytes)
-			default:
-				bodyStr = call.Arguments[1].String()
-			}
-		}
-
-		if len(call.Arguments) > 2 && !goja.IsUndefined(call.Arguments[2]) && !goja.IsNull(call.Arguments[2]) {
-			headersObj := call.Arguments[2].Export()
-			if h, ok := headersObj.(map[string]interface{}); ok {
-				for k, v := range h {
-					headers[k] = fmt.Sprintf("%v", v)
-				}
-			}
-		}
-	}
-
-	var reqBody io.Reader
-	if bodyStr != "" {
-		reqBody = strings.NewReader(bodyStr)
-	}
-
-	req, err := http.NewRequest(method, urlStr, reqBody)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"error": err.Error(),
-		})
-	}
-
-	for k, v := range headers {
-		req.Header.Set(k, v)
-	}
-	if req.Header.Get("User-Agent") == "" {
-		req.Header.Set("User-Agent", "Spotiflac-Extension/1.0")
-	}
-	if bodyStr != "" && req.Header.Get("Content-Type") == "" {
-		req.Header.Set("Content-Type", "application/json")
-	}
-
-	resp, err := r.httpClient.Do(req)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"error": err.Error(),
-		})
-	}
-	defer resp.Body.Close()
-
-	body, err := io.ReadAll(resp.Body)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"error": err.Error(),
-		})
-	}
-
-	respHeaders := make(map[string]interface{})
-	for k, v := range resp.Header {
-		if len(v) == 1 {
-			respHeaders[k] = v[0]
-		} else {
-			respHeaders[k] = v
-		}
-	}
-
-	return r.vm.ToValue(map[string]interface{}{
-		"statusCode": resp.StatusCode,
-		"status":     resp.StatusCode,
-		"ok":         resp.StatusCode >= 200 && resp.StatusCode < 300,
-		"body":       string(body),
-		"headers":    respHeaders,
-	})
-}
-
-func (r *ExtensionRuntime) httpClearCookies(call goja.FunctionCall) goja.Value {
-	if jar, ok := r.cookieJar.(*simpleCookieJar); ok {
-		jar.mu.Lock()
-		jar.cookies = make(map[string][]*http.Cookie)
-		jar.mu.Unlock()
-		GoLog("[Extension:%s] Cookies cleared\n", r.extensionID)
-		return r.vm.ToValue(true)
-	}
-	return r.vm.ToValue(false)
-}

go_backend/extension_runtime_matching.go

@@ -1,136 +0,0 @@
-// Package gobackend provides Track Matching API for extension runtime
-package gobackend
-
-import (
-	"strings"
-
-	"github.com/dop251/goja"
-)
-
-// ==================== Track Matching API ====================
-
-func (r *ExtensionRuntime) matchingCompareStrings(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 2 {
-		return r.vm.ToValue(0.0)
-	}
-
-	str1 := strings.ToLower(strings.TrimSpace(call.Arguments[0].String()))
-	str2 := strings.ToLower(strings.TrimSpace(call.Arguments[1].String()))
-
-	if str1 == str2 {
-		return r.vm.ToValue(1.0)
-	}
-
-	similarity := calculateStringSimilarity(str1, str2)
-	return r.vm.ToValue(similarity)
-}
-
-func (r *ExtensionRuntime) matchingCompareDuration(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 2 {
-		return r.vm.ToValue(false)
-	}
-
-	dur1 := int(call.Arguments[0].ToInteger())
-	dur2 := int(call.Arguments[1].ToInteger())
-
-	tolerance := 3000
-	if len(call.Arguments) > 2 && !goja.IsUndefined(call.Arguments[2]) {
-		tolerance = int(call.Arguments[2].ToInteger())
-	}
-
-	diff := dur1 - dur2
-	if diff < 0 {
-		diff = -diff
-	}
-
-	return r.vm.ToValue(diff <= tolerance)
-}
-
-func (r *ExtensionRuntime) matchingNormalizeString(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue("")
-	}
-
-	str := call.Arguments[0].String()
-	normalized := normalizeStringForMatching(str)
-	return r.vm.ToValue(normalized)
-}
-
-func calculateStringSimilarity(s1, s2 string) float64 {
-	if len(s1) == 0 && len(s2) == 0 {
-		return 1.0
-	}
-	if len(s1) == 0 || len(s2) == 0 {
-		return 0.0
-	}
-
-	distance := levenshteinDistance(s1, s2)
-	maxLen := len(s1)
-	if len(s2) > maxLen {
-		maxLen = len(s2)
-	}
-
-	return 1.0 - float64(distance)/float64(maxLen)
-}
-
-func levenshteinDistance(s1, s2 string) int {
-	if len(s1) == 0 {
-		return len(s2)
-	}
-	if len(s2) == 0 {
-		return len(s1)
-	}
-
-	matrix := make([][]int, len(s1)+1)
-	for i := range matrix {
-		matrix[i] = make([]int, len(s2)+1)
-		matrix[i][0] = i
-	}
-	for j := range matrix[0] {
-		matrix[0][j] = j
-	}
-
-	for i := 1; i <= len(s1); i++ {
-		for j := 1; j <= len(s2); j++ {
-			cost := 1
-			if s1[i-1] == s2[j-1] {
-				cost = 0
-			}
-			matrix[i][j] = min(
-				matrix[i-1][j]+1,
-				matrix[i][j-1]+1,
-				matrix[i-1][j-1]+cost,
-			)
-		}
-	}
-
-	return matrix[len(s1)][len(s2)]
-}
-
-func normalizeStringForMatching(s string) string {
-	s = strings.ToLower(s)
-
-	suffixes := []string{
-		" (remastered)", " (remaster)", " - remastered", " - remaster",
-		" (deluxe)", " (deluxe edition)", " - deluxe", " - deluxe edition",
-		" (explicit)", " (clean)", " [explicit]", " [clean]",
-		" (album version)", " (single version)", " (radio edit)",
-		" (feat.", " (ft.", " feat.", " ft.",
-	}
-	for _, suffix := range suffixes {
-		if idx := strings.Index(s, suffix); idx != -1 {
-			s = s[:idx]
-		}
-	}
-
-	var result strings.Builder
-	for _, r := range s {
-		if (r >= 'a' && r <= 'z') || (r >= '0' && r <= '9') || r == ' ' {
-			result.WriteRune(r)
-		}
-	}
-
-	s = strings.Join(strings.Fields(result.String()), " ")
-
-	return strings.TrimSpace(s)
-}

go_backend/extension_runtime_polyfills.go

@@ -1,448 +0,0 @@
-// Package gobackend provides Browser-like Polyfills for extension runtime
-package gobackend
-
-import (
-	"encoding/base64"
-	"encoding/json"
-	"fmt"
-	"io"
-	"net/http"
-	"net/url"
-	"strings"
-
-	"github.com/dop251/goja"
-)
-
-// ==================== Browser-like Polyfills ====================
-// These polyfills make porting browser/Node.js libraries easier
-// without compromising sandbox security
-
-// fetchPolyfill implements browser-compatible fetch() API
-// Returns a Promise-like object with json(), text() methods
-func (r *ExtensionRuntime) fetchPolyfill(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.createFetchError("URL is required")
-	}
-
-	urlStr := call.Arguments[0].String()
-	if err := r.validateDomain(urlStr); err != nil {
-		GoLog("[Extension:%s] fetch blocked: %v\n", r.extensionID, err)
-		return r.createFetchError(err.Error())
-	}
-
-	method := "GET"
-	var bodyStr string
-	headers := make(map[string]string)
-
-	if len(call.Arguments) > 1 && !goja.IsUndefined(call.Arguments[1]) && !goja.IsNull(call.Arguments[1]) {
-		optionsObj := call.Arguments[1].Export()
-		if opts, ok := optionsObj.(map[string]interface{}); ok {
-			if m, ok := opts["method"].(string); ok {
-				method = strings.ToUpper(m)
-			}
-
-			// Body - support string, object (auto-stringify), or nil
-			if bodyArg, ok := opts["body"]; ok && bodyArg != nil {
-				switch v := bodyArg.(type) {
-				case string:
-					bodyStr = v
-				case map[string]interface{}, []interface{}:
-					jsonBytes, err := json.Marshal(v)
-					if err != nil {
-						return r.createFetchError(fmt.Sprintf("failed to stringify body: %v", err))
-					}
-					bodyStr = string(jsonBytes)
-				default:
-					bodyStr = fmt.Sprintf("%v", v)
-				}
-			}
-
-			if h, ok := opts["headers"]; ok && h != nil {
-				switch hv := h.(type) {
-				case map[string]interface{}:
-					for k, v := range hv {
-						headers[k] = fmt.Sprintf("%v", v)
-					}
-				}
-			}
-		}
-	}
-
-	var reqBody io.Reader
-	if bodyStr != "" {
-		reqBody = strings.NewReader(bodyStr)
-	}
-
-	req, err := http.NewRequest(method, urlStr, reqBody)
-	if err != nil {
-		return r.createFetchError(err.Error())
-	}
-
-	for k, v := range headers {
-		req.Header.Set(k, v)
-	}
-	if req.Header.Get("User-Agent") == "" {
-		req.Header.Set("User-Agent", "SpotiFLAC-Extension/1.0")
-	}
-	if bodyStr != "" && req.Header.Get("Content-Type") == "" {
-		req.Header.Set("Content-Type", "application/json")
-	}
-
-	resp, err := r.httpClient.Do(req)
-	if err != nil {
-		return r.createFetchError(err.Error())
-	}
-	defer resp.Body.Close()
-
-	body, err := io.ReadAll(resp.Body)
-	if err != nil {
-		return r.createFetchError(err.Error())
-	}
-
-	respHeaders := make(map[string]interface{})
-	for k, v := range resp.Header {
-		if len(v) == 1 {
-			respHeaders[k] = v[0]
-		} else {
-			respHeaders[k] = v
-		}
-	}
-
-	responseObj := r.vm.NewObject()
-	responseObj.Set("ok", resp.StatusCode >= 200 && resp.StatusCode < 300)
-	responseObj.Set("status", resp.StatusCode)
-	responseObj.Set("statusText", http.StatusText(resp.StatusCode))
-	responseObj.Set("headers", respHeaders)
-	responseObj.Set("url", urlStr)
-
-	bodyString := string(body)
-
-	responseObj.Set("text", func(call goja.FunctionCall) goja.Value {
-		return r.vm.ToValue(bodyString)
-	})
-
-	responseObj.Set("json", func(call goja.FunctionCall) goja.Value {
-		var result interface{}
-		if err := json.Unmarshal(body, &result); err != nil {
-			GoLog("[Extension:%s] fetch json() parse error: %v\n", r.extensionID, err)
-			return goja.Undefined()
-		}
-		return r.vm.ToValue(result)
-	})
-
-	responseObj.Set("arrayBuffer", func(call goja.FunctionCall) goja.Value {
-		byteArray := make([]interface{}, len(body))
-		for i, b := range body {
-			byteArray[i] = int(b)
-		}
-		return r.vm.ToValue(byteArray)
-	})
-
-	return responseObj
-}
-
-// createFetchError creates a fetch error response
-func (r *ExtensionRuntime) createFetchError(message string) goja.Value {
-	errorObj := r.vm.NewObject()
-	errorObj.Set("ok", false)
-	errorObj.Set("status", 0)
-	errorObj.Set("statusText", "Network Error")
-	errorObj.Set("error", message)
-	errorObj.Set("text", func(call goja.FunctionCall) goja.Value {
-		return r.vm.ToValue("")
-	})
-	errorObj.Set("json", func(call goja.FunctionCall) goja.Value {
-		return goja.Undefined()
-	})
-	return errorObj
-}
-
-// atobPolyfill implements browser atob() - decode base64 to string
-func (r *ExtensionRuntime) atobPolyfill(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue("")
-	}
-	input := call.Arguments[0].String()
-	decoded, err := base64.StdEncoding.DecodeString(input)
-	if err != nil {
-		decoded, err = base64.URLEncoding.DecodeString(input)
-		if err != nil {
-			GoLog("[Extension:%s] atob decode error: %v\n", r.extensionID, err)
-			return r.vm.ToValue("")
-		}
-	}
-	return r.vm.ToValue(string(decoded))
-}
-
-// btoaPolyfill implements browser btoa() - encode string to base64
-func (r *ExtensionRuntime) btoaPolyfill(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue("")
-	}
-	input := call.Arguments[0].String()
-	return r.vm.ToValue(base64.StdEncoding.EncodeToString([]byte(input)))
-}
-
-// registerTextEncoderDecoder registers TextEncoder and TextDecoder classes
-func (r *ExtensionRuntime) registerTextEncoderDecoder(vm *goja.Runtime) {
-	vm.Set("TextEncoder", func(call goja.ConstructorCall) *goja.Object {
-		encoder := call.This
-		encoder.Set("encoding", "utf-8")
-
-		encoder.Set("encode", func(call goja.FunctionCall) goja.Value {
-			if len(call.Arguments) < 1 {
-				return vm.ToValue([]byte{})
-			}
-			input := call.Arguments[0].String()
-			bytes := []byte(input)
-
-			result := make([]interface{}, len(bytes))
-			for i, b := range bytes {
-				result[i] = int(b)
-			}
-			return vm.ToValue(result)
-		})
-
-		encoder.Set("encodeInto", func(call goja.FunctionCall) goja.Value {
-			// Simplified implementation
-			if len(call.Arguments) < 2 {
-				return vm.ToValue(map[string]interface{}{"read": 0, "written": 0})
-			}
-			input := call.Arguments[0].String()
-			return vm.ToValue(map[string]interface{}{
-				"read":    len(input),
-				"written": len([]byte(input)),
-			})
-		})
-
-		return nil
-	})
-
-	vm.Set("TextDecoder", func(call goja.ConstructorCall) *goja.Object {
-		decoder := call.This
-
-		encoding := "utf-8"
-		if len(call.Arguments) > 0 && !goja.IsUndefined(call.Arguments[0]) {
-			encoding = call.Arguments[0].String()
-		}
-		decoder.Set("encoding", encoding)
-		decoder.Set("fatal", false)
-		decoder.Set("ignoreBOM", false)
-
-		decoder.Set("decode", func(call goja.FunctionCall) goja.Value {
-			if len(call.Arguments) < 1 {
-				return vm.ToValue("")
-			}
-
-			input := call.Arguments[0].Export()
-			var bytes []byte
-
-			switch v := input.(type) {
-			case []byte:
-				bytes = v
-			case []interface{}:
-				bytes = make([]byte, len(v))
-				for i, val := range v {
-					switch n := val.(type) {
-					case int64:
-						bytes[i] = byte(n)
-					case float64:
-						bytes[i] = byte(n)
-					case int:
-						bytes[i] = byte(n)
-					}
-				}
-			case string:
-				return vm.ToValue(v)
-			default:
-				return vm.ToValue("")
-			}
-
-			return vm.ToValue(string(bytes))
-		})
-
-		return nil
-	})
-}
-
-func (r *ExtensionRuntime) registerURLClass(vm *goja.Runtime) {
-	vm.Set("URL", func(call goja.ConstructorCall) *goja.Object {
-		urlObj := call.This
-
-		if len(call.Arguments) < 1 {
-			urlObj.Set("href", "")
-			return nil
-		}
-
-		urlStr := call.Arguments[0].String()
-
-		if len(call.Arguments) > 1 && !goja.IsUndefined(call.Arguments[1]) {
-			baseStr := call.Arguments[1].String()
-			baseURL, err := url.Parse(baseStr)
-			if err == nil {
-				relURL, err := url.Parse(urlStr)
-				if err == nil {
-					urlStr = baseURL.ResolveReference(relURL).String()
-				}
-			}
-		}
-
-		parsed, err := url.Parse(urlStr)
-		if err != nil {
-			urlObj.Set("href", urlStr)
-			return nil
-		}
-
-		urlObj.Set("href", parsed.String())
-		urlObj.Set("protocol", parsed.Scheme+":")
-		urlObj.Set("host", parsed.Host)
-		urlObj.Set("hostname", parsed.Hostname())
-		urlObj.Set("port", parsed.Port())
-		urlObj.Set("pathname", parsed.Path)
-		urlObj.Set("search", "")
-		if parsed.RawQuery != "" {
-			urlObj.Set("search", "?"+parsed.RawQuery)
-		}
-		urlObj.Set("hash", "")
-		if parsed.Fragment != "" {
-			urlObj.Set("hash", "#"+parsed.Fragment)
-		}
-		urlObj.Set("origin", parsed.Scheme+"://"+parsed.Host)
-		urlObj.Set("username", parsed.User.Username())
-		password, _ := parsed.User.Password()
-		urlObj.Set("password", password)
-
-		queryValues := parsed.Query()
-
-		searchParams := vm.NewObject()
-		searchParams.Set("get", func(call goja.FunctionCall) goja.Value {
-			if len(call.Arguments) < 1 {
-				return goja.Null()
-			}
-			key := call.Arguments[0].String()
-			if val := queryValues.Get(key); val != "" {
-				return vm.ToValue(val)
-			}
-			return goja.Null()
-		})
-
-		searchParams.Set("getAll", func(call goja.FunctionCall) goja.Value {
-			if len(call.Arguments) < 1 {
-				return vm.ToValue([]string{})
-			}
-			key := call.Arguments[0].String()
-			return vm.ToValue(queryValues[key])
-		})
-
-		searchParams.Set("has", func(call goja.FunctionCall) goja.Value {
-			if len(call.Arguments) < 1 {
-				return vm.ToValue(false)
-			}
-			key := call.Arguments[0].String()
-			return vm.ToValue(queryValues.Has(key))
-		})
-
-		searchParams.Set("toString", func(call goja.FunctionCall) goja.Value {
-			return vm.ToValue(queryValues.Encode())
-		})
-
-		urlObj.Set("searchParams", searchParams)
-
-		urlObj.Set("toString", func(call goja.FunctionCall) goja.Value {
-			return vm.ToValue(parsed.String())
-		})
-
-		urlObj.Set("toJSON", func(call goja.FunctionCall) goja.Value {
-			return vm.ToValue(parsed.String())
-		})
-
-		return nil
-	})
-
-	vm.Set("URLSearchParams", func(call goja.ConstructorCall) *goja.Object {
-		paramsObj := call.This
-		values := url.Values{}
-
-		if len(call.Arguments) > 0 && !goja.IsUndefined(call.Arguments[0]) {
-			init := call.Arguments[0].Export()
-			switch v := init.(type) {
-			case string:
-				parsed, _ := url.ParseQuery(strings.TrimPrefix(v, "?"))
-				values = parsed
-			case map[string]interface{}:
-				for k, val := range v {
-					values.Set(k, fmt.Sprintf("%v", val))
-				}
-			}
-		}
-
-		paramsObj.Set("append", func(call goja.FunctionCall) goja.Value {
-			if len(call.Arguments) >= 2 {
-				values.Add(call.Arguments[0].String(), call.Arguments[1].String())
-			}
-			return goja.Undefined()
-		})
-
-		paramsObj.Set("delete", func(call goja.FunctionCall) goja.Value {
-			if len(call.Arguments) >= 1 {
-				values.Del(call.Arguments[0].String())
-			}
-			return goja.Undefined()
-		})
-
-		paramsObj.Set("get", func(call goja.FunctionCall) goja.Value {
-			if len(call.Arguments) < 1 {
-				return goja.Null()
-			}
-			if val := values.Get(call.Arguments[0].String()); val != "" {
-				return vm.ToValue(val)
-			}
-			return goja.Null()
-		})
-
-		paramsObj.Set("getAll", func(call goja.FunctionCall) goja.Value {
-			if len(call.Arguments) < 1 {
-				return vm.ToValue([]string{})
-			}
-			return vm.ToValue(values[call.Arguments[0].String()])
-		})
-
-		paramsObj.Set("has", func(call goja.FunctionCall) goja.Value {
-			if len(call.Arguments) < 1 {
-				return vm.ToValue(false)
-			}
-			return vm.ToValue(values.Has(call.Arguments[0].String()))
-		})
-
-		paramsObj.Set("set", func(call goja.FunctionCall) goja.Value {
-			if len(call.Arguments) >= 2 {
-				values.Set(call.Arguments[0].String(), call.Arguments[1].String())
-			}
-			return goja.Undefined()
-		})
-
-		paramsObj.Set("toString", func(call goja.FunctionCall) goja.Value {
-			return vm.ToValue(values.Encode())
-		})
-
-		return nil
-	})
-}
-
-// registerJSONGlobal ensures JSON global is properly set up
-func (r *ExtensionRuntime) registerJSONGlobal(vm *goja.Runtime) {
-	// JSON is already built-in to Goja, but we can enhance it
-	jsonScript := `
-		if (typeof JSON === 'undefined') {
-			var JSON = {
-				parse: function(text) {
-					return utils.parseJSON(text);
-				},
-				stringify: function(value, replacer, space) {
-					return utils.stringifyJSON(value);
-				}
-			};
-		}
-	`
-	_, _ = vm.RunString(jsonScript)
-}

go_backend/extension_runtime_storage.go

@@ -1,349 +0,0 @@
-// Package gobackend provides Storage and Credentials API for extension runtime
-package gobackend
-
-import (
-	"crypto/aes"
-	"crypto/cipher"
-	"crypto/rand"
-	"crypto/sha256"
-	"encoding/json"
-	"fmt"
-	"io"
-	"os"
-	"path/filepath"
-
-	"github.com/dop251/goja"
-)
-
-// ==================== Storage API ====================
-
-func (r *ExtensionRuntime) getStoragePath() string {
-	return filepath.Join(r.dataDir, "storage.json")
-}
-
-func (r *ExtensionRuntime) loadStorage() (map[string]interface{}, error) {
-	storagePath := r.getStoragePath()
-	data, err := os.ReadFile(storagePath)
-	if err != nil {
-		if os.IsNotExist(err) {
-			return make(map[string]interface{}), nil
-		}
-		return nil, err
-	}
-
-	var storage map[string]interface{}
-	if err := json.Unmarshal(data, &storage); err != nil {
-		return nil, err
-	}
-
-	return storage, nil
-}
-
-func (r *ExtensionRuntime) saveStorage(storage map[string]interface{}) error {
-	storagePath := r.getStoragePath()
-	data, err := json.MarshalIndent(storage, "", "  ")
-	if err != nil {
-		return err
-	}
-
-	return os.WriteFile(storagePath, data, 0644)
-}
-
-func (r *ExtensionRuntime) storageGet(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return goja.Undefined()
-	}
-
-	key := call.Arguments[0].String()
-
-	storage, err := r.loadStorage()
-	if err != nil {
-		GoLog("[Extension:%s] Storage load error: %v\n", r.extensionID, err)
-		return goja.Undefined()
-	}
-
-	value, exists := storage[key]
-	if !exists {
-		if len(call.Arguments) > 1 {
-			return call.Arguments[1]
-		}
-		return goja.Undefined()
-	}
-
-	return r.vm.ToValue(value)
-}
-
-func (r *ExtensionRuntime) storageSet(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 2 {
-		return r.vm.ToValue(false)
-	}
-
-	key := call.Arguments[0].String()
-	value := call.Arguments[1].Export()
-
-	storage, err := r.loadStorage()
-	if err != nil {
-		GoLog("[Extension:%s] Storage load error: %v\n", r.extensionID, err)
-		return r.vm.ToValue(false)
-	}
-
-	storage[key] = value
-
-	if err := r.saveStorage(storage); err != nil {
-		GoLog("[Extension:%s] Storage save error: %v\n", r.extensionID, err)
-		return r.vm.ToValue(false)
-	}
-
-	return r.vm.ToValue(true)
-}
-
-func (r *ExtensionRuntime) storageRemove(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue(false)
-	}
-
-	key := call.Arguments[0].String()
-
-	storage, err := r.loadStorage()
-	if err != nil {
-		GoLog("[Extension:%s] Storage load error: %v\n", r.extensionID, err)
-		return r.vm.ToValue(false)
-	}
-
-	delete(storage, key)
-
-	if err := r.saveStorage(storage); err != nil {
-		GoLog("[Extension:%s] Storage save error: %v\n", r.extensionID, err)
-		return r.vm.ToValue(false)
-	}
-
-	return r.vm.ToValue(true)
-}
-
-func (r *ExtensionRuntime) getCredentialsPath() string {
-	return filepath.Join(r.dataDir, ".credentials.enc")
-}
-
-func (r *ExtensionRuntime) getSaltPath() string {
-	return filepath.Join(r.dataDir, ".cred_salt")
-}
-
-func (r *ExtensionRuntime) getOrCreateSalt() ([]byte, error) {
-	saltPath := r.getSaltPath()
-
-	salt, err := os.ReadFile(saltPath)
-	if err == nil && len(salt) == 32 {
-		return salt, nil
-	}
-
-	salt = make([]byte, 32)
-	if _, err := io.ReadFull(rand.Reader, salt); err != nil {
-		return nil, fmt.Errorf("failed to generate salt: %w", err)
-	}
-
-	if err := os.WriteFile(saltPath, salt, 0600); err != nil {
-		return nil, fmt.Errorf("failed to save salt: %w", err)
-	}
-
-	return salt, nil
-}
-
-func (r *ExtensionRuntime) getEncryptionKey() ([]byte, error) {
-	salt, err := r.getOrCreateSalt()
-	if err != nil {
-		return nil, err
-	}
-
-	combined := append([]byte(r.extensionID), salt...)
-	hash := sha256.Sum256(combined)
-	return hash[:], nil
-}
-
-func (r *ExtensionRuntime) loadCredentials() (map[string]interface{}, error) {
-	credPath := r.getCredentialsPath()
-	data, err := os.ReadFile(credPath)
-	if err != nil {
-		if os.IsNotExist(err) {
-			return make(map[string]interface{}), nil
-		}
-		return nil, err
-	}
-
-	key, err := r.getEncryptionKey()
-	if err != nil {
-		return nil, fmt.Errorf("failed to get encryption key: %w", err)
-	}
-	decrypted, err := decryptAES(data, key)
-	if err != nil {
-		return nil, fmt.Errorf("failed to decrypt credentials: %w", err)
-	}
-
-	var creds map[string]interface{}
-	if err := json.Unmarshal(decrypted, &creds); err != nil {
-		return nil, err
-	}
-
-	return creds, nil
-}
-
-func (r *ExtensionRuntime) saveCredentials(creds map[string]interface{}) error {
-	data, err := json.Marshal(creds)
-	if err != nil {
-		return err
-	}
-
-	key, err := r.getEncryptionKey()
-	if err != nil {
-		return fmt.Errorf("failed to get encryption key: %w", err)
-	}
-	encrypted, err := encryptAES(data, key)
-	if err != nil {
-		return fmt.Errorf("failed to encrypt credentials: %w", err)
-	}
-
-	credPath := r.getCredentialsPath()
-	return os.WriteFile(credPath, encrypted, 0600)
-}
-
-func (r *ExtensionRuntime) credentialsStore(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 2 {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   "key and value are required",
-		})
-	}
-
-	key := call.Arguments[0].String()
-	value := call.Arguments[1].Export()
-
-	creds, err := r.loadCredentials()
-	if err != nil {
-		GoLog("[Extension:%s] Credentials load error: %v\n", r.extensionID, err)
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   err.Error(),
-		})
-	}
-
-	creds[key] = value
-
-	if err := r.saveCredentials(creds); err != nil {
-		GoLog("[Extension:%s] Credentials save error: %v\n", r.extensionID, err)
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   err.Error(),
-		})
-	}
-
-	return r.vm.ToValue(map[string]interface{}{
-		"success": true,
-	})
-}
-
-func (r *ExtensionRuntime) credentialsGet(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return goja.Undefined()
-	}
-
-	key := call.Arguments[0].String()
-
-	creds, err := r.loadCredentials()
-	if err != nil {
-		GoLog("[Extension:%s] Credentials load error: %v\n", r.extensionID, err)
-		return goja.Undefined()
-	}
-
-	value, exists := creds[key]
-	if !exists {
-		if len(call.Arguments) > 1 {
-			return call.Arguments[1]
-		}
-		return goja.Undefined()
-	}
-
-	return r.vm.ToValue(value)
-}
-
-func (r *ExtensionRuntime) credentialsRemove(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue(false)
-	}
-
-	key := call.Arguments[0].String()
-
-	creds, err := r.loadCredentials()
-	if err != nil {
-		GoLog("[Extension:%s] Credentials load error: %v\n", r.extensionID, err)
-		return r.vm.ToValue(false)
-	}
-
-	delete(creds, key)
-
-	if err := r.saveCredentials(creds); err != nil {
-		GoLog("[Extension:%s] Credentials save error: %v\n", r.extensionID, err)
-		return r.vm.ToValue(false)
-	}
-
-	return r.vm.ToValue(true)
-}
-
-func (r *ExtensionRuntime) credentialsHas(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue(false)
-	}
-
-	key := call.Arguments[0].String()
-
-	creds, err := r.loadCredentials()
-	if err != nil {
-		return r.vm.ToValue(false)
-	}
-
-	_, exists := creds[key]
-	return r.vm.ToValue(exists)
-}
-
-func encryptAES(plaintext []byte, key []byte) ([]byte, error) {
-	block, err := aes.NewCipher(key)
-	if err != nil {
-		return nil, err
-	}
-
-	gcm, err := cipher.NewGCM(block)
-	if err != nil {
-		return nil, err
-	}
-
-	nonce := make([]byte, gcm.NonceSize())
-	if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
-		return nil, err
-	}
-
-	ciphertext := gcm.Seal(nonce, nonce, plaintext, nil)
-	return ciphertext, nil
-}
-
-func decryptAES(ciphertext []byte, key []byte) ([]byte, error) {
-	block, err := aes.NewCipher(key)
-	if err != nil {
-		return nil, err
-	}
-
-	gcm, err := cipher.NewGCM(block)
-	if err != nil {
-		return nil, err
-	}
-
-	nonceSize := gcm.NonceSize()
-	if len(ciphertext) < nonceSize {
-		return nil, fmt.Errorf("ciphertext too short")
-	}
-
-	nonce, ciphertext := ciphertext[:nonceSize], ciphertext[nonceSize:]
-	plaintext, err := gcm.Open(nil, nonce, ciphertext, nil)
-	if err != nil {
-		return nil, err
-	}
-
-	return plaintext, nil
-}

go_backend/extension_runtime_utils.go

@@ -1,367 +0,0 @@
-// Package gobackend provides Utility functions for extension runtime
-package gobackend
-
-import (
-	"crypto/hmac"
-	"crypto/md5"
-	"crypto/rand"
-	"crypto/sha1"
-	"crypto/sha256"
-	"encoding/base64"
-	"encoding/hex"
-	"encoding/json"
-	"fmt"
-	"strings"
-	"time"
-
-	"github.com/dop251/goja"
-)
-
-// ==================== Utility Functions ====================
-
-func (r *ExtensionRuntime) base64Encode(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue("")
-	}
-	input := call.Arguments[0].String()
-	return r.vm.ToValue(base64.StdEncoding.EncodeToString([]byte(input)))
-}
-
-func (r *ExtensionRuntime) base64Decode(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue("")
-	}
-	input := call.Arguments[0].String()
-	decoded, err := base64.StdEncoding.DecodeString(input)
-	if err != nil {
-		return r.vm.ToValue("")
-	}
-	return r.vm.ToValue(string(decoded))
-}
-
-func (r *ExtensionRuntime) md5Hash(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue("")
-	}
-	input := call.Arguments[0].String()
-	hash := md5.Sum([]byte(input))
-	return r.vm.ToValue(hex.EncodeToString(hash[:]))
-}
-
-func (r *ExtensionRuntime) sha256Hash(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue("")
-	}
-	input := call.Arguments[0].String()
-	hash := sha256.Sum256([]byte(input))
-	return r.vm.ToValue(hex.EncodeToString(hash[:]))
-}
-
-func (r *ExtensionRuntime) hmacSHA256(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 2 {
-		return r.vm.ToValue("")
-	}
-	message := call.Arguments[0].String()
-	key := call.Arguments[1].String()
-
-	mac := hmac.New(sha256.New, []byte(key))
-	mac.Write([]byte(message))
-	return r.vm.ToValue(hex.EncodeToString(mac.Sum(nil)))
-}
-
-func (r *ExtensionRuntime) hmacSHA256Base64(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 2 {
-		return r.vm.ToValue("")
-	}
-	message := call.Arguments[0].String()
-	key := call.Arguments[1].String()
-
-	mac := hmac.New(sha256.New, []byte(key))
-	mac.Write([]byte(message))
-	return r.vm.ToValue(base64.StdEncoding.EncodeToString(mac.Sum(nil)))
-}
-
-func (r *ExtensionRuntime) hmacSHA1(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 2 {
-		return r.vm.ToValue([]byte{})
-	}
-
-	var keyBytes []byte
-	keyArg := call.Arguments[0].Export()
-	switch k := keyArg.(type) {
-	case string:
-		keyBytes = []byte(k)
-	case []interface{}:
-		keyBytes = make([]byte, len(k))
-		for i, v := range k {
-			if num, ok := v.(int64); ok {
-				keyBytes[i] = byte(num)
-			} else if num, ok := v.(float64); ok {
-				keyBytes[i] = byte(int(num))
-			}
-		}
-	default:
-		return r.vm.ToValue([]byte{})
-	}
-
-	var msgBytes []byte
-	msgArg := call.Arguments[1].Export()
-	switch m := msgArg.(type) {
-	case string:
-		msgBytes = []byte(m)
-	case []interface{}:
-		msgBytes = make([]byte, len(m))
-		for i, v := range m {
-			if num, ok := v.(int64); ok {
-				msgBytes[i] = byte(num)
-			} else if num, ok := v.(float64); ok {
-				msgBytes[i] = byte(int(num))
-			}
-		}
-	default:
-		return r.vm.ToValue([]byte{})
-	}
-
-	mac := hmac.New(sha1.New, keyBytes)
-	mac.Write(msgBytes)
-	result := mac.Sum(nil)
-
-	jsArray := make([]interface{}, len(result))
-	for i, b := range result {
-		jsArray[i] = int(b)
-	}
-	return r.vm.ToValue(jsArray)
-}
-
-func (r *ExtensionRuntime) parseJSON(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return goja.Undefined()
-	}
-	input := call.Arguments[0].String()
-
-	var result interface{}
-	if err := json.Unmarshal([]byte(input), &result); err != nil {
-		GoLog("[Extension:%s] JSON parse error: %v\n", r.extensionID, err)
-		return goja.Undefined()
-	}
-
-	return r.vm.ToValue(result)
-}
-
-func (r *ExtensionRuntime) stringifyJSON(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue("")
-	}
-	input := call.Arguments[0].Export()
-
-	data, err := json.Marshal(input)
-	if err != nil {
-		GoLog("[Extension:%s] JSON stringify error: %v\n", r.extensionID, err)
-		return r.vm.ToValue("")
-	}
-
-	return r.vm.ToValue(string(data))
-}
-
-func (r *ExtensionRuntime) cryptoEncrypt(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 2 {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   "plaintext and key are required",
-		})
-	}
-
-	plaintext := call.Arguments[0].String()
-	keyStr := call.Arguments[1].String()
-
-	keyHash := sha256.Sum256([]byte(keyStr))
-
-	encrypted, err := encryptAES([]byte(plaintext), keyHash[:])
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   err.Error(),
-		})
-	}
-
-	return r.vm.ToValue(map[string]interface{}{
-		"success": true,
-		"data":    base64.StdEncoding.EncodeToString(encrypted),
-	})
-}
-
-func (r *ExtensionRuntime) cryptoDecrypt(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 2 {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   "ciphertext and key are required",
-		})
-	}
-
-	ciphertextB64 := call.Arguments[0].String()
-	keyStr := call.Arguments[1].String()
-
-	ciphertext, err := base64.StdEncoding.DecodeString(ciphertextB64)
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   "invalid base64 ciphertext",
-		})
-	}
-
-	keyHash := sha256.Sum256([]byte(keyStr))
-
-	decrypted, err := decryptAES(ciphertext, keyHash[:])
-	if err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   "invalid base64 ciphertext",
-		})
-	}
-
-	return r.vm.ToValue(map[string]interface{}{
-		"success": true,
-		"data":    string(decrypted),
-	})
-}
-
-func (r *ExtensionRuntime) cryptoGenerateKey(call goja.FunctionCall) goja.Value {
-	length := 32
-	if len(call.Arguments) > 0 && !goja.IsUndefined(call.Arguments[0]) {
-		if l, ok := call.Arguments[0].Export().(float64); ok {
-			length = int(l)
-		}
-	}
-
-	key := make([]byte, length)
-	if _, err := rand.Read(key); err != nil {
-		return r.vm.ToValue(map[string]interface{}{
-			"success": false,
-			"error":   err.Error(),
-		})
-	}
-
-	return r.vm.ToValue(map[string]interface{}{
-		"success": true,
-		"key":     base64.StdEncoding.EncodeToString(key),
-		"hex":     hex.EncodeToString(key),
-	})
-}
-
-func (r *ExtensionRuntime) randomUserAgent(call goja.FunctionCall) goja.Value {
-	return r.vm.ToValue(getRandomUserAgent())
-}
-
-func (r *ExtensionRuntime) logDebug(call goja.FunctionCall) goja.Value {
-	msg := r.formatLogArgs(call.Arguments)
-	GoLog("[Extension:%s:DEBUG] %s\n", r.extensionID, msg)
-	return goja.Undefined()
-}
-
-func (r *ExtensionRuntime) logInfo(call goja.FunctionCall) goja.Value {
-	msg := r.formatLogArgs(call.Arguments)
-	GoLog("[Extension:%s:INFO] %s\n", r.extensionID, msg)
-	return goja.Undefined()
-}
-
-func (r *ExtensionRuntime) logWarn(call goja.FunctionCall) goja.Value {
-	msg := r.formatLogArgs(call.Arguments)
-	GoLog("[Extension:%s:WARN] %s\n", r.extensionID, msg)
-	return goja.Undefined()
-}
-
-func (r *ExtensionRuntime) logError(call goja.FunctionCall) goja.Value {
-	msg := r.formatLogArgs(call.Arguments)
-	GoLog("[Extension:%s:ERROR] %s\n", r.extensionID, msg)
-	return goja.Undefined()
-}
-
-func (r *ExtensionRuntime) formatLogArgs(args []goja.Value) string {
-	parts := make([]string, len(args))
-	for i, arg := range args {
-		parts[i] = fmt.Sprintf("%v", arg.Export())
-	}
-	return strings.Join(parts, " ")
-}
-
-func (r *ExtensionRuntime) sanitizeFilenameWrapper(call goja.FunctionCall) goja.Value {
-	if len(call.Arguments) < 1 {
-		return r.vm.ToValue("")
-	}
-	input := call.Arguments[0].String()
-	return r.vm.ToValue(sanitizeFilename(input))
-}
-
-func (r *ExtensionRuntime) RegisterGoBackendAPIs(vm *goja.Runtime) {
-	gobackendObj := vm.Get("gobackend")
-	if gobackendObj == nil || goja.IsUndefined(gobackendObj) {
-		gobackendObj = vm.NewObject()
-		vm.Set("gobackend", gobackendObj)
-	}
-
-	obj := gobackendObj.(*goja.Object)
-
-	obj.Set("sanitizeFilename", func(call goja.FunctionCall) goja.Value {
-		if len(call.Arguments) < 1 {
-			return vm.ToValue("")
-		}
-		return vm.ToValue(sanitizeFilename(call.Arguments[0].String()))
-	})
-
-	obj.Set("getAudioQuality", func(call goja.FunctionCall) goja.Value {
-		if len(call.Arguments) < 1 {
-			return vm.ToValue(map[string]interface{}{
-				"error": "file path is required",
-			})
-		}
-
-		filePath := call.Arguments[0].String()
-		quality, err := GetAudioQuality(filePath)
-		if err != nil {
-			return vm.ToValue(map[string]interface{}{
-				"error": err.Error(),
-			})
-		}
-
-		return vm.ToValue(map[string]interface{}{
-			"bitDepth":     quality.BitDepth,
-			"sampleRate":   quality.SampleRate,
-			"totalSamples": quality.TotalSamples,
-		})
-	})
-
-	obj.Set("buildFilename", func(call goja.FunctionCall) goja.Value {
-		if len(call.Arguments) < 2 {
-			return vm.ToValue("")
-		}
-
-		template := call.Arguments[0].String()
-		metadataObj := call.Arguments[1].Export()
-
-		metadata, ok := metadataObj.(map[string]interface{})
-		if !ok {
-			return vm.ToValue("")
-		}
-
-		return vm.ToValue(buildFilenameFromTemplate(template, metadata))
-	})
-
-	obj.Set("getLocalTime", func(call goja.FunctionCall) goja.Value {
-		now := time.Now()
-		_, offsetSeconds := now.Zone()
-		offsetMinutes := offsetSeconds / 60
-
-		return vm.ToValue(map[string]interface{}{
-			"year":          now.Year(),
-			"month":         int(now.Month()),
-			"day":           now.Day(),
-			"hour":          now.Hour(),
-			"minute":        now.Minute(),
-			"second":        now.Second(),
-			"weekday":       int(now.Weekday()),
-			"offsetMinutes": -offsetMinutes, // JS convention: negative for east of UTC
-			"timezone":      now.Location().String(),
-			"timestamp":     now.Unix(),
-		})
-	})
-}

go_backend/extension_settings.go

@@ -1,198 +0,0 @@
-// Package gobackend provides extension settings storage
-package gobackend
-
-import (
-	"encoding/json"
-	"fmt"
-	"os"
-	"path/filepath"
-	"sync"
-)
-
-type ExtensionSettingsStore struct {
-	mu       sync.RWMutex
-	dataDir  string
-	settings map[string]map[string]interface{} // extensionID -> settings
-}
-
-var (
-	globalSettingsStore     *ExtensionSettingsStore
-	globalSettingsStoreOnce sync.Once
-)
-
-func GetExtensionSettingsStore() *ExtensionSettingsStore {
-	globalSettingsStoreOnce.Do(func() {
-		globalSettingsStore = &ExtensionSettingsStore{
-			settings: make(map[string]map[string]interface{}),
-		}
-	})
-	return globalSettingsStore
-}
-
-func (s *ExtensionSettingsStore) SetDataDir(dataDir string) error {
-	s.mu.Lock()
-	defer s.mu.Unlock()
-
-	s.dataDir = dataDir
-	if err := os.MkdirAll(dataDir, 0755); err != nil {
-		return fmt.Errorf("failed to create settings directory: %w", err)
-	}
-
-	return s.loadAllSettings()
-}
-
-func (s *ExtensionSettingsStore) getSettingsPath(extensionID string) string {
-	return filepath.Join(s.dataDir, extensionID, "settings.json")
-}
-
-func (s *ExtensionSettingsStore) loadAllSettings() error {
-	entries, err := os.ReadDir(s.dataDir)
-	if err != nil {
-		if os.IsNotExist(err) {
-			return nil
-		}
-		return err
-	}
-
-	for _, entry := range entries {
-		if entry.IsDir() {
-			extensionID := entry.Name()
-			settings, err := s.loadSettings(extensionID)
-			if err != nil {
-				GoLog("[ExtensionSettings] Failed to load settings for %s: %v\n", extensionID, err)
-				continue
-			}
-			s.settings[extensionID] = settings
-		}
-	}
-
-	return nil
-}
-
-func (s *ExtensionSettingsStore) loadSettings(extensionID string) (map[string]interface{}, error) {
-	settingsPath := s.getSettingsPath(extensionID)
-	data, err := os.ReadFile(settingsPath)
-	if err != nil {
-		if os.IsNotExist(err) {
-			return make(map[string]interface{}), nil
-		}
-		return nil, err
-	}
-
-	var settings map[string]interface{}
-	if err := json.Unmarshal(data, &settings); err != nil {
-		return nil, err
-	}
-
-	return settings, nil
-}
-
-func (s *ExtensionSettingsStore) saveSettings(extensionID string, settings map[string]interface{}) error {
-	settingsPath := s.getSettingsPath(extensionID)
-
-	dir := filepath.Dir(settingsPath)
-	if err := os.MkdirAll(dir, 0755); err != nil {
-		return err
-	}
-
-	data, err := json.MarshalIndent(settings, "", "  ")
-	if err != nil {
-		return err
-	}
-
-	return os.WriteFile(settingsPath, data, 0644)
-}
-
-func (s *ExtensionSettingsStore) Get(extensionID, key string) (interface{}, error) {
-	s.mu.RLock()
-	defer s.mu.RUnlock()
-
-	extSettings, exists := s.settings[extensionID]
-	if !exists {
-		return nil, fmt.Errorf("extension '%s' settings not found", extensionID)
-	}
-
-	value, exists := extSettings[key]
-	if !exists {
-		return nil, fmt.Errorf("setting '%s' not found for extension '%s'", key, extensionID)
-	}
-	return value, nil
-}
-
-func (s *ExtensionSettingsStore) GetAll(extensionID string) map[string]interface{} {
-	s.mu.RLock()
-	defer s.mu.RUnlock()
-
-	extSettings, exists := s.settings[extensionID]
-	if !exists {
-		return make(map[string]interface{})
-	}
-
-	result := make(map[string]interface{})
-	for k, v := range extSettings {
-		result[k] = v
-	}
-	return result
-}
-
-func (s *ExtensionSettingsStore) Set(extensionID, key string, value interface{}) error {
-	s.mu.Lock()
-	defer s.mu.Unlock()
-
-	if _, exists := s.settings[extensionID]; !exists {
-		s.settings[extensionID] = make(map[string]interface{})
-	}
-
-	s.settings[extensionID][key] = value
-
-	return s.saveSettings(extensionID, s.settings[extensionID])
-}
-
-func (s *ExtensionSettingsStore) SetAll(extensionID string, settings map[string]interface{}) error {
-	s.mu.Lock()
-	defer s.mu.Unlock()
-
-	s.settings[extensionID] = settings
-
-	return s.saveSettings(extensionID, settings)
-}
-
-func (s *ExtensionSettingsStore) Remove(extensionID, key string) error {
-	s.mu.Lock()
-	defer s.mu.Unlock()
-
-	extSettings, exists := s.settings[extensionID]
-	if !exists {
-		return nil
-	}
-
-	delete(extSettings, key)
-
-	return s.saveSettings(extensionID, extSettings)
-}
-
-func (s *ExtensionSettingsStore) RemoveAll(extensionID string) error {
-	s.mu.Lock()
-	defer s.mu.Unlock()
-
-	delete(s.settings, extensionID)
-
-	settingsPath := s.getSettingsPath(extensionID)
-	if err := os.Remove(settingsPath); err != nil && !os.IsNotExist(err) {
-		return err
-	}
-
-	return nil
-}
-
-func (s *ExtensionSettingsStore) GetAllExtensionSettingsJSON() (string, error) {
-	s.mu.RLock()
-	defer s.mu.RUnlock()
-
-	data, err := json.Marshal(s.settings)
-	if err != nil {
-		return "", err
-	}
-
-	return string(data), nil
-}

go_backend/extension_store.go

@@ -1,452 +0,0 @@
-package gobackend
-
-import (
-	"encoding/json"
-	"fmt"
-	"io"
-	"net/http"
-	"net/url"
-	"os"
-	"path/filepath"
-	"sync"
-	"time"
-)
-
-const (
-	CategoryMetadata    = "metadata"
-	CategoryDownload    = "download"
-	CategoryUtility     = "utility"
-	CategoryLyrics      = "lyrics"
-	CategoryIntegration = "integration"
-)
-
-type StoreExtension struct {
-	ID               string   `json:"id"`
-	Name             string   `json:"name"`
-	DisplayName      string   `json:"display_name,omitempty"`
-	Version          string   `json:"version"`
-	Author           string   `json:"author"`
-	Description      string   `json:"description"`
-	DownloadURL      string   `json:"download_url,omitempty"`
-	IconURL          string   `json:"icon_url,omitempty"`
-	Category         string   `json:"category"`
-	Tags             []string `json:"tags,omitempty"`
-	Downloads        int      `json:"downloads"`
-	UpdatedAt        string   `json:"updated_at"`
-	MinAppVersion    string   `json:"min_app_version,omitempty"`
-	DisplayNameAlt   string   `json:"displayName,omitempty"`
-	DownloadURLAlt   string   `json:"downloadUrl,omitempty"`
-	IconURLAlt       string   `json:"iconUrl,omitempty"`
-	MinAppVersionAlt string   `json:"minAppVersion,omitempty"`
-}
-
-func (e *StoreExtension) getDisplayName() string {
-	if e.DisplayName != "" {
-		return e.DisplayName
-	}
-	if e.DisplayNameAlt != "" {
-		return e.DisplayNameAlt
-	}
-	return e.Name
-}
-
-func (e *StoreExtension) getDownloadURL() string {
-	if e.DownloadURL != "" {
-		return e.DownloadURL
-	}
-	return e.DownloadURLAlt
-}
-
-func (e *StoreExtension) getIconURL() string {
-	if e.IconURL != "" {
-		return e.IconURL
-	}
-	return e.IconURLAlt
-}
-
-func (e *StoreExtension) getMinAppVersion() string {
-	if e.MinAppVersion != "" {
-		return e.MinAppVersion
-	}
-	return e.MinAppVersionAlt
-}
-
-type StoreRegistry struct {
-	Version    int              `json:"version"`
-	UpdatedAt  string           `json:"updated_at"`
-	Extensions []StoreExtension `json:"extensions"`
-}
-
-// StoreExtensionResponse is the normalized response sent to Flutter
-type StoreExtensionResponse struct {
-	ID               string   `json:"id"`
-	Name             string   `json:"name"`
-	DisplayName      string   `json:"display_name"`
-	Version          string   `json:"version"`
-	Author           string   `json:"author"`
-	Description      string   `json:"description"`
-	DownloadURL      string   `json:"download_url"`
-	IconURL          string   `json:"icon_url,omitempty"`
-	Category         string   `json:"category"`
-	Tags             []string `json:"tags,omitempty"`
-	Downloads        int      `json:"downloads"`
-	UpdatedAt        string   `json:"updated_at"`
-	MinAppVersion    string   `json:"min_app_version,omitempty"`
-	IsInstalled      bool     `json:"is_installed"`
-	InstalledVersion string   `json:"installed_version,omitempty"`
-	HasUpdate        bool     `json:"has_update"`
-}
-
-func (e *StoreExtension) ToResponse() StoreExtensionResponse {
-	return StoreExtensionResponse{
-		ID:            e.ID,
-		Name:          e.Name,
-		DisplayName:   e.getDisplayName(),
-		Version:       e.Version,
-		Author:        e.Author,
-		Description:   e.Description,
-		DownloadURL:   e.getDownloadURL(),
-		IconURL:       e.getIconURL(),
-		Category:      e.Category,
-		Tags:          e.Tags,
-		Downloads:     e.Downloads,
-		UpdatedAt:     e.UpdatedAt,
-		MinAppVersion: e.getMinAppVersion(),
-	}
-}
-
-type ExtensionStore struct {
-	registryURL string
-	cacheDir    string
-	cache       *StoreRegistry
-	cacheMu     sync.RWMutex
-	cacheTime   time.Time
-	cacheTTL    time.Duration
-}
-
-var (
-	extensionStore   *ExtensionStore
-	extensionStoreMu sync.Mutex
-)
-
-const (
-	defaultRegistryURL = "https://raw.githubusercontent.com/zarzet/SpotiFLAC-Extension/main/registry.json"
-	cacheTTL           = 30 * time.Minute
-	cacheFileName      = "store_cache.json"
-)
-
-func InitExtensionStore(cacheDir string) *ExtensionStore {
-	extensionStoreMu.Lock()
-	defer extensionStoreMu.Unlock()
-
-	if extensionStore == nil {
-		extensionStore = &ExtensionStore{
-			registryURL: defaultRegistryURL,
-			cacheDir:    cacheDir,
-			cacheTTL:    cacheTTL,
-		}
-		extensionStore.loadDiskCache()
-	}
-	return extensionStore
-}
-
-func GetExtensionStore() *ExtensionStore {
-	extensionStoreMu.Lock()
-	defer extensionStoreMu.Unlock()
-	return extensionStore
-}
-
-func (s *ExtensionStore) loadDiskCache() {
-	if s.cacheDir == "" {
-		return
-	}
-
-	cachePath := filepath.Join(s.cacheDir, cacheFileName)
-	data, err := os.ReadFile(cachePath)
-	if err != nil {
-		return
-	}
-
-	var cacheData struct {
-		Registry  StoreRegistry `json:"registry"`
-		CacheTime int64         `json:"cache_time"`
-	}
-
-	if err := json.Unmarshal(data, &cacheData); err != nil {
-		return
-	}
-
-	s.cache = &cacheData.Registry
-	s.cacheTime = time.Unix(cacheData.CacheTime, 0)
-	LogDebug("ExtensionStore", "Loaded %d extensions from disk cache", len(s.cache.Extensions))
-}
-
-func (s *ExtensionStore) saveDiskCache() {
-	if s.cacheDir == "" || s.cache == nil {
-		return
-	}
-
-	cacheData := struct {
-		Registry  StoreRegistry `json:"registry"`
-		CacheTime int64         `json:"cache_time"`
-	}{
-		Registry:  *s.cache,
-		CacheTime: s.cacheTime.Unix(),
-	}
-
-	data, err := json.Marshal(cacheData)
-	if err != nil {
-		return
-	}
-
-	cachePath := filepath.Join(s.cacheDir, cacheFileName)
-	os.WriteFile(cachePath, data, 0644)
-}
-
-func (s *ExtensionStore) FetchRegistry(forceRefresh bool) (*StoreRegistry, error) {
-	s.cacheMu.Lock()
-	defer s.cacheMu.Unlock()
-
-	if !forceRefresh && s.cache != nil && time.Since(s.cacheTime) < s.cacheTTL {
-		LogDebug("ExtensionStore", "Using cached registry (%d extensions)", len(s.cache.Extensions))
-		return s.cache, nil
-	}
-
-	if err := requireHTTPSURL(s.registryURL, "registry"); err != nil {
-		return nil, err
-	}
-
-	LogInfo("ExtensionStore", "Fetching registry from %s", s.registryURL)
-
-	client := &http.Client{Timeout: 30 * time.Second}
-	resp, err := client.Get(s.registryURL)
-	if err != nil {
-		if s.cache != nil {
-			LogWarn("ExtensionStore", "Network error, using cached registry: %v", err)
-			return s.cache, nil
-		}
-		return nil, fmt.Errorf("failed to fetch registry: %w", err)
-	}
-	defer resp.Body.Close()
-
-	if resp.StatusCode != http.StatusOK {
-		if s.cache != nil {
-			LogWarn("ExtensionStore", "HTTP %d, using cached registry", resp.StatusCode)
-			return s.cache, nil
-		}
-		return nil, fmt.Errorf("registry returned HTTP %d", resp.StatusCode)
-	}
-
-	body, err := io.ReadAll(resp.Body)
-	if err != nil {
-		return nil, fmt.Errorf("failed to read registry: %w", err)
-	}
-
-	var registry StoreRegistry
-	if err := json.Unmarshal(body, &registry); err != nil {
-		return nil, fmt.Errorf("failed to parse registry: %w", err)
-	}
-
-	s.cache = &registry
-	s.cacheTime = time.Now()
-	s.saveDiskCache()
-
-	LogInfo("ExtensionStore", "Fetched %d extensions from registry", len(registry.Extensions))
-	return &registry, nil
-}
-
-func (s *ExtensionStore) GetExtensionsWithStatus() ([]StoreExtensionResponse, error) {
-	registry, err := s.FetchRegistry(false)
-	if err != nil {
-		return nil, err
-	}
-
-	manager := GetExtensionManager()
-	installed := make(map[string]string) // id -> version
-
-	if manager != nil {
-		for _, ext := range manager.GetAllExtensions() {
-			installed[ext.ID] = ext.Manifest.Version
-		}
-	}
-
-	result := make([]StoreExtensionResponse, len(registry.Extensions))
-	for i, ext := range registry.Extensions {
-		resp := ext.ToResponse()
-
-		if installedVersion, ok := installed[ext.ID]; ok {
-			resp.IsInstalled = true
-			resp.InstalledVersion = installedVersion
-			resp.HasUpdate = compareVersions(ext.Version, installedVersion) > 0
-		}
-
-		result[i] = resp
-	}
-
-	return result, nil
-}
-
-func (s *ExtensionStore) DownloadExtension(extensionID string, destPath string) error {
-	registry, err := s.FetchRegistry(false)
-	if err != nil {
-		return err
-	}
-
-	var ext *StoreExtension
-	for _, e := range registry.Extensions {
-		if e.ID == extensionID {
-			ext = &e
-			break
-		}
-	}
-
-	if ext == nil {
-		return fmt.Errorf("extension %s not found in store", extensionID)
-	}
-
-	if err := requireHTTPSURL(ext.getDownloadURL(), "extension download"); err != nil {
-		return err
-	}
-
-	LogInfo("ExtensionStore", "Downloading %s from %s", ext.getDisplayName(), ext.getDownloadURL())
-
-	client := &http.Client{Timeout: 5 * time.Minute}
-	resp, err := client.Get(ext.getDownloadURL())
-	if err != nil {
-		return fmt.Errorf("failed to download: %w", err)
-	}
-	defer resp.Body.Close()
-
-	if resp.StatusCode != http.StatusOK {
-		return fmt.Errorf("download returned HTTP %d", resp.StatusCode)
-	}
-
-	out, err := os.Create(destPath)
-	if err != nil {
-		return fmt.Errorf("failed to create file: %w", err)
-	}
-	defer out.Close()
-
-	_, err = io.Copy(out, resp.Body)
-	if err != nil {
-		os.Remove(destPath)
-		return fmt.Errorf("failed to write file: %w", err)
-	}
-
-	LogInfo("ExtensionStore", "Downloaded %s to %s", ext.getDisplayName(), destPath)
-	return nil
-}
-
-func requireHTTPSURL(rawURL string, context string) error {
-	if rawURL == "" {
-		return fmt.Errorf("%s URL is empty", context)
-	}
-	parsed, err := url.Parse(rawURL)
-	if err != nil || parsed.Host == "" {
-		return fmt.Errorf("%s URL is invalid: %s", context, rawURL)
-	}
-	if parsed.Scheme != "https" {
-		return fmt.Errorf("%s URL must use https: %s", context, rawURL)
-	}
-	return nil
-}
-
-func (s *ExtensionStore) GetCategories() []string {
-	return []string{
-		CategoryMetadata,
-		CategoryDownload,
-		CategoryUtility,
-		CategoryLyrics,
-		CategoryIntegration,
-	}
-}
-
-func (s *ExtensionStore) SearchExtensions(query string, category string) ([]StoreExtensionResponse, error) {
-	extensions, err := s.GetExtensionsWithStatus()
-	if err != nil {
-		return nil, err
-	}
-
-	if query == "" && category == "" {
-		return extensions, nil
-	}
-
-	var result []StoreExtensionResponse
-	queryLower := toLower(query)
-
-	for _, ext := range extensions {
-		// Filter by category
-		if category != "" && ext.Category != category {
-			continue
-		}
-
-		// Filter by query
-		if query != "" {
-			if !containsIgnoreCase(ext.Name, queryLower) &&
-				!containsIgnoreCase(ext.DisplayName, queryLower) &&
-				!containsIgnoreCase(ext.Description, queryLower) &&
-				!containsIgnoreCase(ext.Author, queryLower) {
-				// Check tags
-				found := false
-				for _, tag := range ext.Tags {
-					if containsIgnoreCase(tag, queryLower) {
-						found = true
-						break
-					}
-				}
-				if !found {
-					continue
-				}
-			}
-		}
-
-		result = append(result, ext)
-	}
-
-	return result, nil
-}
-
-func (s *ExtensionStore) ClearCache() {
-	s.cacheMu.Lock()
-	defer s.cacheMu.Unlock()
-
-	s.cache = nil
-	s.cacheTime = time.Time{}
-
-	if s.cacheDir != "" {
-		cachePath := filepath.Join(s.cacheDir, cacheFileName)
-		os.Remove(cachePath)
-	}
-
-	LogInfo("ExtensionStore", "Cache cleared")
-}
-
-// Helper: case-insensitive contains
-func containsIgnoreCase(s, substr string) bool {
-	return containsStr(toLower(s), substr)
-}
-
-func toLower(s string) string {
-	result := make([]byte, len(s))
-	for i := 0; i < len(s); i++ {
-		c := s[i]
-		if c >= 'A' && c <= 'Z' {
-			c += 'a' - 'A'
-		}
-		result[i] = c
-	}
-	return string(result)
-}
-
-func containsStr(s, substr string) bool {
-	return len(substr) == 0 || (len(s) >= len(substr) && findSubstring(s, substr) >= 0)
-}
-
-func findSubstring(s, substr string) int {
-	for i := 0; i <= len(s)-len(substr); i++ {
-		if s[i:i+len(substr)] == substr {
-			return i
-		}
-	}
-	return -1
-}

go_backend/extension_test.go

@@ -1,314 +0,0 @@
-package gobackend
-
-import (
-	"path/filepath"
-	"testing"
-
-	"github.com/dop251/goja"
-)
-
-func TestParseManifest_Valid(t *testing.T) {
-	validManifest := `{
-		"name": "test-provider",
-		"displayName": "Test Provider",
-		"version": "1.0.0",
-		"author": "Test Author",
-		"description": "A test extension",
-		"type": ["metadata_provider"],
-		"permissions": {
-			"network": ["api.test.com"],
-			"storage": true
-		}
-	}`
-
-	manifest, err := ParseManifest([]byte(validManifest))
-	if err != nil {
-		t.Fatalf("Expected valid manifest to parse, got error: %v", err)
-	}
-
-	if manifest.Name != "test-provider" {
-		t.Errorf("Expected name 'test-provider', got '%s'", manifest.Name)
-	}
-
-	if manifest.Version != "1.0.0" {
-		t.Errorf("Expected version '1.0.0', got '%s'", manifest.Version)
-	}
-
-	if !manifest.IsMetadataProvider() {
-		t.Error("Expected IsMetadataProvider() to return true")
-	}
-
-	if manifest.IsDownloadProvider() {
-		t.Error("Expected IsDownloadProvider() to return false")
-	}
-}
-
-func TestParseManifest_MissingName(t *testing.T) {
-	invalidManifest := `{
-		"version": "1.0.0",
-		"author": "Test Author",
-		"description": "A test extension",
-		"type": ["metadata_provider"]
-	}`
-
-	_, err := ParseManifest([]byte(invalidManifest))
-	if err == nil {
-		t.Fatal("Expected error for missing name")
-	}
-}
-
-func TestParseManifest_MissingType(t *testing.T) {
-	invalidManifest := `{
-		"name": "test-provider",
-		"version": "1.0.0",
-		"author": "Test Author",
-		"description": "A test extension"
-	}`
-
-	_, err := ParseManifest([]byte(invalidManifest))
-	if err == nil {
-		t.Fatal("Expected error for missing type")
-	}
-}
-
-func TestIsDomainAllowed(t *testing.T) {
-	manifest := &ExtensionManifest{
-		Permissions: ExtensionPermissions{
-			Network: []string{"api.test.com", "*.example.com"},
-		},
-	}
-
-	tests := []struct {
-		domain   string
-		expected bool
-	}{
-		{"api.test.com", true},
-		{"api.example.com", true},
-		{"sub.example.com", true},
-		{"notallowed.com", false},
-		{"test.com", false},
-	}
-
-	for _, tt := range tests {
-		result := manifest.IsDomainAllowed(tt.domain)
-		if result != tt.expected {
-			t.Errorf("IsDomainAllowed(%s) = %v, expected %v", tt.domain, result, tt.expected)
-		}
-	}
-}
-
-func TestExtensionRuntime_NetworkSandbox(t *testing.T) {
-	// Create a mock extension with limited network permissions
-	ext := &LoadedExtension{
-		ID: "test-ext",
-		Manifest: &ExtensionManifest{
-			Name: "test-ext",
-			Permissions: ExtensionPermissions{
-				Network: []string{"api.allowed.com", "*.wildcard.com"},
-			},
-		},
-		DataDir: t.TempDir(),
-	}
-
-	runtime := NewExtensionRuntime(ext)
-
-	if err := runtime.validateDomain("https://api.allowed.com/path"); err != nil {
-		t.Errorf("Expected api.allowed.com to be allowed, got error: %v", err)
-	}
-
-	if err := runtime.validateDomain("https://sub.wildcard.com/path"); err != nil {
-		t.Errorf("Expected sub.wildcard.com to be allowed (wildcard), got error: %v", err)
-	}
-
-	if err := runtime.validateDomain("https://blocked.com/path"); err == nil {
-		t.Error("Expected blocked.com to be denied")
-	}
-
-	if err := runtime.validateDomain("https://notallowed.com/path"); err == nil {
-		t.Error("Expected notallowed.com to be denied")
-	}
-}
-
-func TestExtensionRuntime_FileSandbox(t *testing.T) {
-	tempDir := t.TempDir()
-
-	ext := &LoadedExtension{
-		ID: "test-ext",
-		Manifest: &ExtensionManifest{
-			Name: "test-ext",
-			Permissions: ExtensionPermissions{
-				File: true,
-			},
-		},
-		DataDir: tempDir,
-	}
-
-	runtime := NewExtensionRuntime(ext)
-
-	validPath, err := runtime.validatePath("test.txt")
-	if err != nil {
-		t.Errorf("Expected relative path to be valid, got error: %v", err)
-	}
-	if validPath == "" {
-		t.Error("Expected non-empty path")
-	}
-
-	_, err = runtime.validatePath("../../../etc/passwd")
-	if err == nil {
-		t.Error("Expected path traversal to be blocked")
-	}
-
-	nestedPath, err := runtime.validatePath("subdir/file.txt")
-	if err != nil {
-		t.Errorf("Expected nested path to be valid, got error: %v", err)
-	}
-	if nestedPath == "" {
-		t.Error("Expected non-empty nested path")
-	}
-
-	var absPath string
-	if filepath.IsAbs("C:\\Windows\\System32") {
-		absPath = "C:\\Windows\\System32\\test.txt"
-	} else {
-		absPath = "/etc/passwd"
-	}
-	_, err = runtime.validatePath(absPath)
-	if err == nil {
-		t.Error("Expected absolute path to be blocked")
-	}
-
-	extNoFile := &LoadedExtension{
-		ID: "test-ext-no-file",
-		Manifest: &ExtensionManifest{
-			Name: "test-ext-no-file",
-			Permissions: ExtensionPermissions{
-				File: false,
-			},
-		},
-		DataDir: tempDir,
-	}
-	runtimeNoFile := NewExtensionRuntime(extNoFile)
-	_, err = runtimeNoFile.validatePath("test.txt")
-	if err == nil {
-		t.Error("Expected file access to be denied without file permission")
-	}
-}
-
-func TestExtensionRuntime_UtilityFunctions(t *testing.T) {
-	ext := &LoadedExtension{
-		ID: "test-ext",
-		Manifest: &ExtensionManifest{
-			Name: "test-ext",
-		},
-		DataDir: t.TempDir(),
-	}
-
-	runtime := NewExtensionRuntime(ext)
-	vm := goja.New()
-	runtime.RegisterAPIs(vm)
-
-	result, err := vm.RunString(`utils.base64Encode("hello")`)
-	if err != nil {
-		t.Fatalf("base64Encode failed: %v", err)
-	}
-	if result.String() != "aGVsbG8=" {
-		t.Errorf("Expected 'aGVsbG8=', got '%s'", result.String())
-	}
-
-	result, err = vm.RunString(`utils.base64Decode("aGVsbG8=")`)
-	if err != nil {
-		t.Fatalf("base64Decode failed: %v", err)
-	}
-	if result.String() != "hello" {
-		t.Errorf("Expected 'hello', got '%s'", result.String())
-	}
-
-	result, err = vm.RunString(`utils.md5("hello")`)
-	if err != nil {
-		t.Fatalf("md5 failed: %v", err)
-	}
-	if result.String() != "5d41402abc4b2a76b9719d911017c592" {
-		t.Errorf("Expected '5d41402abc4b2a76b9719d911017c592', got '%s'", result.String())
-	}
-
-	result, err = vm.RunString(`utils.stringifyJSON({name: "test", value: 123})`)
-	if err != nil {
-		t.Fatalf("stringifyJSON failed: %v", err)
-	}
-	// JSON output may vary in order, just check it's valid
-	if result.String() == "" {
-		t.Error("Expected non-empty JSON string")
-	}
-}
-
-func TestExtensionRuntime_SSRFProtection(t *testing.T) {
-	// Create extension with limited network permissions
-	ext := &LoadedExtension{
-		ID: "test-ext",
-		Manifest: &ExtensionManifest{
-			Name: "test-ext",
-			Permissions: ExtensionPermissions{
-				Network: []string{"api.example.com"},
-			},
-		},
-		DataDir: t.TempDir(),
-	}
-
-	runtime := NewExtensionRuntime(ext)
-
-	privateIPs := []string{
-		"http://localhost/admin",
-		"http://127.0.0.1/admin",
-		"http://192.168.1.1/admin",
-		"http://10.0.0.1/admin",
-		"http://172.16.0.1/admin",
-		"http://169.254.169.254/latest/meta-data/", // AWS metadata
-		"http://router.local/admin",
-	}
-
-	for _, url := range privateIPs {
-		err := runtime.validateDomain(url)
-		if err == nil {
-			t.Errorf("Expected private IP/host '%s' to be blocked", url)
-		}
-	}
-
-	if err := runtime.validateDomain("https://api.example.com/path"); err != nil {
-		t.Errorf("Expected api.example.com to be allowed, got error: %v", err)
-	}
-}
-
-func TestIsPrivateIP(t *testing.T) {
-	tests := []struct {
-		host     string
-		expected bool
-	}{
-		{"localhost", true},
-		{"127.0.0.1", true},
-		{"127.0.0.2", true},
-		{"10.0.0.1", true},
-		{"10.255.255.255", true},
-		{"172.16.0.1", true},
-		{"172.31.255.255", true},
-		{"192.168.0.1", true},
-		{"192.168.255.255", true},
-		{"169.254.169.254", true},
-		{"router.local", true},
-		{"mydevice.local", true},
-
-		{"8.8.8.8", false},
-		{"1.1.1.1", false},
-		{"api.example.com", false},
-		{"google.com", false},
-		{"172.15.0.1", false},
-		{"172.32.0.1", false},
-		{"192.167.0.1", false},
-	}
-
-	for _, tt := range tests {
-		result := isPrivateIP(tt.host)
-		if result != tt.expected {
-			t.Errorf("isPrivateIP(%s) = %v, expected %v", tt.host, result, tt.expected)
-		}
-	}
-}

go_backend/extension_timeout.go

@@ -1,105 +0,0 @@
-// Package gobackend provides timeout execution for extension JS code
-package gobackend
-
-import (
-	"context"
-	"fmt"
-	"sync"
-	"time"
-
-	"github.com/dop251/goja"
-)
-
-type JSExecutionError struct {
-	Message   string
-	IsTimeout bool
-}
-
-func (e *JSExecutionError) Error() string {
-	return e.Message
-}
-
-func RunWithTimeout(vm *goja.Runtime, script string, timeout time.Duration) (goja.Value, error) {
-	if timeout <= 0 {
-		timeout = DefaultJSTimeout
-	}
-
-	ctx, cancel := context.WithTimeout(context.Background(), timeout)
-	defer cancel()
-
-	type result struct {
-		value goja.Value
-		err   error
-	}
-	resultCh := make(chan result, 1)
-
-	var interrupted bool
-	var interruptMu sync.Mutex
-
-	go func() {
-		defer func() {
-			if r := recover(); r != nil {
-				interruptMu.Lock()
-				wasInterrupted := interrupted
-				interruptMu.Unlock()
-
-				if wasInterrupted {
-					resultCh <- result{nil, &JSExecutionError{
-						Message:   "execution timeout exceeded",
-						IsTimeout: true,
-					}}
-				} else {
-					resultCh <- result{nil, fmt.Errorf("panic during execution: %v", r)}
-				}
-			}
-		}()
-
-		val, err := vm.RunString(script)
-		resultCh <- result{val, err}
-	}()
-
-	select {
-	case res := <-resultCh:
-		return res.value, res.err
-	case <-ctx.Done():
-		interruptMu.Lock()
-		interrupted = true
-		interruptMu.Unlock()
-
-		vm.Interrupt("execution timeout")
-
-		select {
-		case res := <-resultCh:
-			if res.err != nil {
-				return nil, res.err
-			}
-			return nil, &JSExecutionError{
-				Message:   "execution timeout exceeded",
-				IsTimeout: true,
-			}
-		case <-time.After(1 * time.Second):
-			return nil, &JSExecutionError{
-				Message:   "execution timeout exceeded (force)",
-				IsTimeout: true,
-			}
-		}
-	}
-}
-
-// RunWithTimeoutAndRecover runs JS with timeout and clears interrupt state after
-// This should be used when you want to continue using the VM after a timeout
-func RunWithTimeoutAndRecover(vm *goja.Runtime, script string, timeout time.Duration) (goja.Value, error) {
-	result, err := RunWithTimeout(vm, script, timeout)
-
-	// Clear any interrupt state so VM can be reused
-	vm.ClearInterrupt()
-
-	return result, err
-}
-
-func IsTimeoutError(err error) bool {
-	if jsErr, ok := err.(*JSExecutionError); ok {
-		return jsErr.IsTimeout
-	}
-	return false
-}

go_backend/filename.go

@@ -6,21 +6,28 @@ import (
 	"strings"
 )
 
+// Invalid filename characters for Android/Windows/Linux
 var invalidChars = regexp.MustCompile(`[<>:"/\\|?*\x00-\x1f]`)
 
+// sanitizeFilename removes invalid characters from filename
 func sanitizeFilename(filename string) string {
+	// Replace invalid characters with underscore
 	sanitized := invalidChars.ReplaceAllString(filename, "_")
 	
+	// Remove leading/trailing spaces and dots
 	sanitized = strings.TrimSpace(sanitized)
 	sanitized = strings.Trim(sanitized, ".")
 	
+	// Collapse multiple underscores
 	multiUnderscore := regexp.MustCompile(`_+`)
 	sanitized = multiUnderscore.ReplaceAllString(sanitized, "_")
 	
+	// Limit length (Android has 255 byte limit for filenames)
 	if len(sanitized) > 200 {
 		sanitized = sanitized[:200]
 	}
 	
+	// Ensure not empty
 	if sanitized == "" {
 		sanitized = "untitled"
 	}
@@ -28,6 +35,7 @@ func sanitizeFilename(filename string) string {
 	return sanitized
 }
 
+// buildFilenameFromTemplate builds a filename from template and metadata
 func buildFilenameFromTemplate(template string, metadata map[string]interface{}) string {
 	if template == "" {
 		template = "{artist} - {title}"
@@ -35,6 +43,7 @@ func buildFilenameFromTemplate(template string, metadata map[string]interface{})
 	
 	result := template
 	
+	// Replace placeholders
 	placeholders := map[string]string{
 		"{title}":  getString(metadata, "title"),
 		"{artist}": getString(metadata, "artist"),
@@ -54,6 +63,7 @@ func buildFilenameFromTemplate(template string, metadata map[string]interface{})
 func getString(m map[string]interface{}, key string) string {
 	if v, ok := m[key]; ok {
 		if s, ok := v.(string); ok {
+			// Trim leading/trailing whitespace to prevent filename issues
 			return strings.TrimSpace(s)
 		}
 	}
@@ -88,6 +98,7 @@ func formatDiscNumber(n int) string {
 	return fmt.Sprintf("%d", n)
 }
 
+// extractYear extracts year from date string (YYYY-MM-DD or YYYY)
 func extractYear(date string) string {
 	if len(date) >= 4 {
 		return date[:4]

go_backend/go.mod

@@ -1,29 +1,18 @@
 module github.com/zarz/spotiflac_android/go_backend
 
-go 1.25.0
+go 1.24.0
 
-toolchain go1.25.6
+toolchain go1.24.5
 
 require (
-	github.com/dop251/goja v0.0.0-20260106131823-651366fbe6e3
 	github.com/go-flac/flacpicture v0.3.0
 	github.com/go-flac/flacvorbis v0.2.0
 	github.com/go-flac/go-flac v1.0.0
-	github.com/refraction-networking/utls v1.8.2
-	golang.org/x/mobile v0.0.0-20260120165949-40bd9ace6ce4
-	golang.org/x/net v0.49.0
 )
 
 require (
-	github.com/andybalholm/brotli v1.0.6 // indirect
-	github.com/dlclark/regexp2 v1.11.4 // indirect
-	github.com/go-sourcemap/sourcemap v2.1.3+incompatible // indirect
-	github.com/google/pprof v0.0.0-20230207041349-798e818bf904 // indirect
-	github.com/klauspost/compress v1.17.4 // indirect
-	golang.org/x/crypto v0.47.0 // indirect
-	golang.org/x/mod v0.32.0 // indirect
+	golang.org/x/mobile v0.0.0-20251209145715-2553ed8ce294 // indirect
+	golang.org/x/mod v0.31.0 // indirect
 	golang.org/x/sync v0.19.0 // indirect
-	golang.org/x/sys v0.40.0 // indirect
-	golang.org/x/text v0.33.0 // indirect
-	golang.org/x/tools v0.41.0 // indirect
+	golang.org/x/tools v0.40.0 // indirect
 )

go_backend/go.sum

@@ -1,42 +1,14 @@
-github.com/Masterminds/semver/v3 v3.2.1 h1:RN9w6+7QoMeJVGyfmbcgs28Br8cvmnucEXnY0rYXWg0=
-github.com/Masterminds/semver/v3 v3.2.1/go.mod h1:qvl/7zhW3nngYb5+80sSMF+FG2BjYrf8m9wsX0PNOMQ=
-github.com/andybalholm/brotli v1.0.6 h1:Yf9fFpf49Zrxb9NlQaluyE92/+X7UVHlhMNJN2sxfOI=
-github.com/andybalholm/brotli v1.0.6/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
-github.com/dlclark/regexp2 v1.11.4 h1:rPYF9/LECdNymJufQKmri9gV604RvvABwgOA8un7yAo=
-github.com/dlclark/regexp2 v1.11.4/go.mod h1:DHkYz0B9wPfa6wondMfaivmHpzrQ3v9q8cnmRbL6yW8=
-github.com/dop251/goja v0.0.0-20260106131823-651366fbe6e3 h1:bVp3yUzvSAJzu9GqID+Z96P+eu5TKnIMJSV4QaZMauM=
-github.com/dop251/goja v0.0.0-20260106131823-651366fbe6e3/go.mod h1:MxLav0peU43GgvwVgNbLAj1s/bSGboKkhuULvq/7hx4=
 github.com/go-flac/flacpicture v0.3.0 h1:LkmTxzFLIynwfhHiZsX0s8xcr3/u33MzvV89u+zOT8I=
 github.com/go-flac/flacpicture v0.3.0/go.mod h1:DPbrzVYQ3fJcvSgLFp9HXIrEQEdfdk/+m0nQCzwodZI=
 github.com/go-flac/flacvorbis v0.2.0 h1:KH0xjpkNTXFER4cszH4zeJxYcrHbUobz/RticWGOESs=
 github.com/go-flac/flacvorbis v0.2.0/go.mod h1:uIysHOtuU7OLGoCRG92bvnkg7QEqHx19qKRV6K1pBrI=
 github.com/go-flac/go-flac v1.0.0 h1:6qI9XOVLcO50xpzm3nXvO31BgDgHhnr/p/rER/K/doY=
 github.com/go-flac/go-flac v1.0.0/go.mod h1:WnZhcpmq4u1UdZMNn9LYSoASpWOCMOoxXxcWEHSzkW8=
-github.com/go-sourcemap/sourcemap v2.1.3+incompatible h1:W1iEw64niKVGogNgBN3ePyLFfuisuzeidWPMPWmECqU=
-github.com/go-sourcemap/sourcemap v2.1.3+incompatible/go.mod h1:F8jJfvm2KbVjc5NqelyYJmf/v5J0dwNLS2mL4sNA1Jg=
-github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
-github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
-github.com/google/pprof v0.0.0-20230207041349-798e818bf904 h1:4/hN5RUoecvl+RmJRE2YxKWtnnQls6rQjjW5oV7qg2U=
-github.com/google/pprof v0.0.0-20230207041349-798e818bf904/go.mod h1:uglQLonpP8qtYCYyzA+8c/9qtqgA3qsXGYqCPKARAFg=
-github.com/klauspost/compress v1.17.4 h1:Ej5ixsIri7BrIjBkRZLTo6ghwrEtHFk7ijlczPW4fZ4=
-github.com/klauspost/compress v1.17.4/go.mod h1:/dCuZOvVtNoHsyb+cuJD3itjs3NbnF6KH9zAO4BDxPM=
-github.com/refraction-networking/utls v1.8.2 h1:j4Q1gJj0xngdeH+Ox/qND11aEfhpgoEvV+S9iJ2IdQo=
-github.com/refraction-networking/utls v1.8.2/go.mod h1:jkSOEkLqn+S/jtpEHPOsVv/4V4EVnelwbMQl4vCWXAM=
-golang.org/x/crypto v0.47.0 h1:V6e3FRj+n4dbpw86FJ8Fv7XVOql7TEwpHapKoMJ/GO8=
-golang.org/x/crypto v0.47.0/go.mod h1:ff3Y9VzzKbwSSEzWqJsJVBnWmRwRSHt/6Op5n9bQc4A=
-golang.org/x/mobile v0.0.0-20260120165949-40bd9ace6ce4 h1:C3JuLOLhdaE75vk5m7u18NvZciRk+lnO34xcXl3NPTU=
-golang.org/x/mobile v0.0.0-20260120165949-40bd9ace6ce4/go.mod h1:yHJY0EGzMJ0i5ONrrhdpDSSnoyres5LO7D2hSIbJJ5I=
-golang.org/x/mod v0.32.0 h1:9F4d3PHLljb6x//jOyokMv3eX+YDeepZSEo3mFJy93c=
-golang.org/x/mod v0.32.0/go.mod h1:SgipZ/3h2Ci89DlEtEXWUk/HteuRin+HHhN+WbNhguU=
-golang.org/x/net v0.49.0 h1:eeHFmOGUTtaaPSGNmjBKpbng9MulQsJURQUAfUwY++o=
-golang.org/x/net v0.49.0/go.mod h1:/ysNB2EvaqvesRkuLAyjI1ycPZlQHM3q01F02UY/MV8=
+golang.org/x/mobile v0.0.0-20251209145715-2553ed8ce294 h1:Cr6kbEvA6nqvdHynE4CtVKlqpZB9dS1Jva/6IsHA19g=
+golang.org/x/mobile v0.0.0-20251209145715-2553ed8ce294/go.mod h1:RdZ+3sb4CVgpCFnzv+I4haEpwqFfsfzlLHs3L7ok+e0=
+golang.org/x/mod v0.31.0 h1:HaW9xtz0+kOcWKwli0ZXy79Ix+UW/vOfmWI5QVd2tgI=
+golang.org/x/mod v0.31.0/go.mod h1:43JraMp9cGx1Rx3AqioxrbrhNsLl2l/iNAvuBkrezpg=
 golang.org/x/sync v0.19.0 h1:vV+1eWNmZ5geRlYjzm2adRgW2/mcpevXNg50YZtPCE4=
 golang.org/x/sync v0.19.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI=
-golang.org/x/sys v0.40.0 h1:DBZZqJ2Rkml6QMQsZywtnjnnGvHza6BTfYFWY9kjEWQ=
-golang.org/x/sys v0.40.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
-golang.org/x/text v0.33.0 h1:B3njUFyqtHDUI5jMn1YIr5B0IE2U0qck04r6d4KPAxE=
-golang.org/x/text v0.33.0/go.mod h1:LuMebE6+rBincTi9+xWTY8TztLzKHc/9C1uBCG27+q8=
-golang.org/x/tools v0.41.0 h1:a9b8iMweWG+S0OBnlU36rzLp20z1Rp10w+IY2czHTQc=
-golang.org/x/tools v0.41.0/go.mod h1:XSY6eDqxVNiYgezAVqqCeihT4j1U2CCsqvH3WhQpnlg=
-gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
-gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
+golang.org/x/tools v0.40.0 h1:yLkxfA+Qnul4cs9QA3KnlFu0lVmd8JJfoq+E41uSutA=
+golang.org/x/tools v0.40.0/go.mod h1:Ik/tzLRlbscWpqqMRjyWYDisX8bG13FrdXp3o4Sr9lc=

go_backend/httputil.go

@@ -1,42 +1,48 @@
 package gobackend
 
 import (
-	"crypto/tls"
-	"errors"
 	"fmt"
 	"io"
 	"math/rand"
 	"net"
 	"net/http"
-	"net/url"
 	"strconv"
-	"strings"
-	"syscall"
 	"time"
 )
 
-func getRandomUserAgent() string {
-	chromeVersion := rand.Intn(26) + 120
-	chromeBuild := rand.Intn(1500) + 6000
-	chromePatch := rand.Intn(200) + 100
+// HTTP utility functions for consistent request handling across all downloaders
 
-	return fmt.Sprintf(
-		"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/%d.0.%d.%d Safari/537.36",
-		chromeVersion,
-		chromeBuild,
-		chromePatch,
-	)
+// User-Agent pool for Android Chrome browsers
+var userAgentTemplates = []string{
+	"Mozilla/5.0 (Linux; Android %d; SM-G%d) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/%d.0.%d.%d Mobile Safari/537.36",
+	"Mozilla/5.0 (Linux; Android %d; Pixel %d) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/%d.0.%d.%d Mobile Safari/537.36",
+	"Mozilla/5.0 (Linux; Android %d; SM-A%d) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/%d.0.%d.%d Mobile Safari/537.36",
+	"Mozilla/5.0 (Linux; Android %d; Redmi Note %d) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/%d.0.%d.%d Mobile Safari/537.36",
 }
 
+// getRandomUserAgent generates a random browser-like User-Agent string (Android Chrome format)
+func getRandomUserAgent() string {
+	template := userAgentTemplates[rand.Intn(len(userAgentTemplates))]
+
+	androidVersion := rand.Intn(5) + 10 // Android 10-14
+	deviceModel := rand.Intn(900) + 100 // Random model number
+	chromeVersion := rand.Intn(25) + 100 // Chrome 100-124
+	chromeBuild := rand.Intn(5000) + 5000
+	chromePatch := rand.Intn(200) + 100
+
+	return fmt.Sprintf(template, androidVersion, deviceModel, chromeVersion, chromeBuild, chromePatch)
+}
+
+// Default timeout values
 const (
-	DefaultTimeout    = 60 * time.Second
-	DownloadTimeout   = 120 * time.Second
-	SongLinkTimeout   = 30 * time.Second
-	DefaultMaxRetries = 3
-	DefaultRetryDelay = 1 * time.Second
-	Second            = time.Second
+	DefaultTimeout     = 60 * time.Second  // Default HTTP timeout
+	DownloadTimeout    = 120 * time.Second // Timeout for file downloads
+	SongLinkTimeout    = 30 * time.Second  // Timeout for SongLink API
+	DefaultMaxRetries  = 3                 // Default retry count
+	DefaultRetryDelay  = 1 * time.Second   // Initial retry delay
 )
 
+// Shared transport with connection pooling to prevent TCP exhaustion
 var sharedTransport = &http.Transport{
 	DialContext: (&net.Dialer{
 		Timeout:   30 * time.Second,
@@ -48,23 +54,24 @@ var sharedTransport = &http.Transport{
 	IdleConnTimeout:       90 * time.Second,
 	TLSHandshakeTimeout:   10 * time.Second,
 	ExpectContinueTimeout: 1 * time.Second,
-	DisableKeepAlives:     false,
+	DisableKeepAlives:     false, // Enable keep-alives for connection reuse
 	ForceAttemptHTTP2:     true,
-	WriteBufferSize:       64 * 1024,
-	ReadBufferSize:        64 * 1024,
-	DisableCompression:    true,
 }
 
+// Shared HTTP client for general requests (reuses connections)
 var sharedClient = &http.Client{
 	Transport: sharedTransport,
 	Timeout:   DefaultTimeout,
 }
 
+// Shared HTTP client for downloads (longer timeout, reuses connections)
 var downloadClient = &http.Client{
 	Transport: sharedTransport,
 	Timeout:   DownloadTimeout,
 }
 
+// NewHTTPClientWithTimeout creates an HTTP client with specified timeout
+// Uses shared transport for connection reuse
 func NewHTTPClientWithTimeout(timeout time.Duration) *http.Client {
 	return &http.Client{
 		Transport: sharedTransport,
@@ -72,26 +79,26 @@ func NewHTTPClientWithTimeout(timeout time.Duration) *http.Client {
 	}
 }
 
+// GetSharedClient returns the shared HTTP client for general requests
 func GetSharedClient() *http.Client {
 	return sharedClient
 }
 
+// GetDownloadClient returns the shared HTTP client for downloads
 func GetDownloadClient() *http.Client {
 	return downloadClient
 }
 
+// CloseIdleConnections closes idle connections in the shared transport
+// Call this periodically during large batch downloads to prevent connection buildup
 func CloseIdleConnections() {
 	sharedTransport.CloseIdleConnections()
 }
 
-// Also checks for ISP blocking on errors
+// DoRequestWithUserAgent executes an HTTP request with a random User-Agent header
 func DoRequestWithUserAgent(client *http.Client, req *http.Request) (*http.Response, error) {
 	req.Header.Set("User-Agent", getRandomUserAgent())
-	resp, err := client.Do(req)
-	if err != nil {
-		CheckAndLogISPBlocking(err, req.URL.String(), "HTTP")
-	}
-	return resp, err
+	return client.Do(req)
 }
 
 // RetryConfig holds configuration for retry logic
@@ -102,6 +109,7 @@ type RetryConfig struct {
 	BackoffFactor float64
 }
 
+// DefaultRetryConfig returns default retry configuration
 func DefaultRetryConfig() RetryConfig {
 	return RetryConfig{
 		MaxRetries:    DefaultMaxRetries,
@@ -111,36 +119,33 @@ func DefaultRetryConfig() RetryConfig {
 	}
 }
 
+// DoRequestWithRetry executes an HTTP request with retry logic and exponential backoff
+// Handles 429 (Too Many Requests) responses with Retry-After header
 func DoRequestWithRetry(client *http.Client, req *http.Request, config RetryConfig) (*http.Response, error) {
 	var lastErr error
 	delay := config.InitialDelay
-	requestURL := req.URL.String()
 
 	for attempt := 0; attempt <= config.MaxRetries; attempt++ {
+		// Clone request for retry (body needs to be re-readable)
 		reqCopy := req.Clone(req.Context())
 		reqCopy.Header.Set("User-Agent", getRandomUserAgent())
 
 		resp, err := client.Do(reqCopy)
 		if err != nil {
 			lastErr = err
-
-			if CheckAndLogISPBlocking(err, requestURL, "HTTP") {
-				return nil, WrapErrorWithISPCheck(err, requestURL, "HTTP")
-			}
-
 			if attempt < config.MaxRetries {
-				GoLog("[HTTP] Request failed (attempt %d/%d): %v, retrying in %v...\n",
-					attempt+1, config.MaxRetries+1, err, delay)
 				time.Sleep(delay)
 				delay = calculateNextDelay(delay, config)
 			}
 			continue
 		}
 
+		// Success
 		if resp.StatusCode >= 200 && resp.StatusCode < 300 {
 			return resp, nil
 		}
 
+		// Handle rate limiting (429)
 		if resp.StatusCode == 429 {
 			resp.Body.Close()
 			retryAfter := getRetryAfterDuration(resp)
@@ -149,59 +154,40 @@ func DoRequestWithRetry(client *http.Client, req *http.Request, config RetryConf
 			}
 			lastErr = fmt.Errorf("rate limited (429)")
 			if attempt < config.MaxRetries {
-				GoLog("[HTTP] Rate limited, waiting %v before retry...\n", delay)
 				time.Sleep(delay)
 				delay = calculateNextDelay(delay, config)
 			}
 			continue
 		}
 
-		// Check for ISP blocking via HTTP status codes
-		// Some ISPs return 403 or 451 when blocking content
-		if resp.StatusCode == 403 || resp.StatusCode == 451 {
-			body, _ := io.ReadAll(resp.Body)
-			resp.Body.Close()
-			bodyStr := strings.ToLower(string(body))
-
-			// Check if response looks like ISP blocking page
-			ispBlockingIndicators := []string{
-				"blocked", "forbidden", "access denied", "not available in your",
-				"restricted", "censored", "unavailable for legal", "blocked by",
-			}
-
-			for _, indicator := range ispBlockingIndicators {
-				if strings.Contains(bodyStr, indicator) {
-					LogError("HTTP", "ISP BLOCKING DETECTED via HTTP %d response", resp.StatusCode)
-					LogError("HTTP", "Domain: %s", req.URL.Host)
-					LogError("HTTP", "Response contains: %s", indicator)
-					LogError("HTTP", "Suggestion: Try using a VPN or changing your DNS to 1.1.1.1 or 8.8.8.8")
-					return nil, fmt.Errorf("ISP blocking detected for %s (HTTP %d) - try using VPN or change DNS", req.URL.Host, resp.StatusCode)
-				}
-			}
-		}
-
+		// Server errors (5xx) - retry
 		if resp.StatusCode >= 500 {
 			resp.Body.Close()
 			lastErr = fmt.Errorf("server error: HTTP %d", resp.StatusCode)
 			if attempt < config.MaxRetries {
-				GoLog("[HTTP] Server error %d, retrying in %v...\n", resp.StatusCode, delay)
 				time.Sleep(delay)
 				delay = calculateNextDelay(delay, config)
 			}
 			continue
 		}
 
+		// Client errors (4xx except 429) - don't retry
 		return resp, nil
 	}
 
 	return nil, fmt.Errorf("request failed after %d retries: %w", config.MaxRetries+1, lastErr)
 }
 
+// calculateNextDelay calculates the next delay with exponential backoff
 func calculateNextDelay(currentDelay time.Duration, config RetryConfig) time.Duration {
 	nextDelay := time.Duration(float64(currentDelay) * config.BackoffFactor)
-	return min(nextDelay, config.MaxDelay)
+	if nextDelay > config.MaxDelay {
+		nextDelay = config.MaxDelay
+	}
+	return nextDelay
 }
 
+// getRetryAfterDuration parses Retry-After header and returns duration
 // Returns 60 seconds as default if header is missing or invalid
 func getRetryAfterDuration(resp *http.Response) time.Duration {
 	retryAfter := resp.Header.Get("Retry-After")
@@ -209,10 +195,12 @@ func getRetryAfterDuration(resp *http.Response) time.Duration {
 		return 60 * time.Second // Default wait time
 	}
 
+	// Try parsing as seconds
 	if seconds, err := strconv.Atoi(retryAfter); err == nil {
 		return time.Duration(seconds) * time.Second
 	}
 
+	// Try parsing as HTTP date
 	if t, err := http.ParseTime(retryAfter); err == nil {
 		duration := time.Until(t)
 		if duration > 0 {
@@ -223,6 +211,8 @@ func getRetryAfterDuration(resp *http.Response) time.Duration {
 	return 60 * time.Second // Default
 }
 
+// ReadResponseBody reads and returns the response body
+// Returns error if body is empty
 func ReadResponseBody(resp *http.Response) ([]byte, error) {
 	if resp == nil {
 		return nil, fmt.Errorf("response is nil")
@@ -240,6 +230,7 @@ func ReadResponseBody(resp *http.Response) ([]byte, error) {
 	return body, nil
 }
 
+// ValidateResponse checks if response is valid (non-nil, status 2xx)
 func ValidateResponse(resp *http.Response) error {
 	if resp == nil {
 		return fmt.Errorf("response is nil")
@@ -252,12 +243,14 @@ func ValidateResponse(resp *http.Response) error {
 	return nil
 }
 
+// BuildErrorMessage creates a detailed error message for API failures
 func BuildErrorMessage(apiURL string, statusCode int, responsePreview string) string {
 	msg := fmt.Sprintf("API %s failed", apiURL)
 	if statusCode > 0 {
 		msg += fmt.Sprintf(" (HTTP %d)", statusCode)
 	}
 	if responsePreview != "" {
+		// Truncate preview if too long
 		if len(responsePreview) > 100 {
 			responsePreview = responsePreview[:100] + "..."
 		}
@@ -265,161 +258,3 @@ func BuildErrorMessage(apiURL string, statusCode int, responsePreview string) st
 	}
 	return msg
 }
-
-type ISPBlockingError struct {
-	Domain      string
-	Reason      string
-	OriginalErr error
-}
-
-func (e *ISPBlockingError) Error() string {
-	return fmt.Sprintf("ISP blocking detected for %s: %s", e.Domain, e.Reason)
-}
-
-func IsISPBlocking(err error, requestURL string) *ISPBlockingError {
-	if err == nil {
-		return nil
-	}
-
-	domain := extractDomain(requestURL)
-	errStr := strings.ToLower(err.Error())
-
-	var dnsErr *net.DNSError
-	if errors.As(err, &dnsErr) {
-		if dnsErr.IsNotFound || dnsErr.IsTemporary {
-			return &ISPBlockingError{
-				Domain:      domain,
-				Reason:      "DNS resolution failed - domain may be blocked by ISP",
-				OriginalErr: err,
-			}
-		}
-	}
-
-	var opErr *net.OpError
-	if errors.As(err, &opErr) {
-		if opErr.Op == "dial" {
-			var syscallErr syscall.Errno
-			if errors.As(opErr.Err, &syscallErr) {
-				switch syscallErr {
-				case syscall.ECONNREFUSED:
-					return &ISPBlockingError{
-						Domain:      domain,
-						Reason:      "Connection refused - port may be blocked by ISP/firewall",
-						OriginalErr: err,
-					}
-				case syscall.ECONNRESET:
-					return &ISPBlockingError{
-						Domain:      domain,
-						Reason:      "Connection reset - ISP may be intercepting traffic",
-						OriginalErr: err,
-					}
-				case syscall.ETIMEDOUT:
-					return &ISPBlockingError{
-						Domain:      domain,
-						Reason:      "Connection timed out - ISP may be blocking access",
-						OriginalErr: err,
-					}
-				case syscall.ENETUNREACH:
-					return &ISPBlockingError{
-						Domain:      domain,
-						Reason:      "Network unreachable - ISP may be blocking route",
-						OriginalErr: err,
-					}
-				case syscall.EHOSTUNREACH:
-					return &ISPBlockingError{
-						Domain:      domain,
-						Reason:      "Host unreachable - ISP may be blocking destination",
-						OriginalErr: err,
-					}
-				}
-			}
-		}
-	}
-
-	var tlsErr *tls.RecordHeaderError
-	if errors.As(err, &tlsErr) {
-		return &ISPBlockingError{
-			Domain:      domain,
-			Reason:      "TLS handshake failed - ISP may be intercepting HTTPS traffic",
-			OriginalErr: err,
-		}
-	}
-
-	// Check error message patterns for common ISP blocking indicators
-	blockingPatterns := []struct {
-		pattern string
-		reason  string
-	}{
-		{"connection reset by peer", "Connection reset - ISP may be intercepting traffic"},
-		{"connection refused", "Connection refused - port may be blocked"},
-		{"no such host", "DNS lookup failed - domain may be blocked by ISP"},
-		{"i/o timeout", "Connection timed out - ISP may be blocking access"},
-		{"network is unreachable", "Network unreachable - ISP may be blocking route"},
-		{"tls: ", "TLS error - ISP may be intercepting HTTPS traffic"},
-		{"certificate", "Certificate error - ISP may be using MITM proxy"},
-		{"eof", "Connection closed unexpectedly - ISP may be blocking"},
-		{"context deadline exceeded", "Request timed out - ISP may be throttling"},
-	}
-
-	for _, bp := range blockingPatterns {
-		if strings.Contains(errStr, bp.pattern) {
-			return &ISPBlockingError{
-				Domain:      domain,
-				Reason:      bp.reason,
-				OriginalErr: err,
-			}
-		}
-	}
-
-	return nil
-}
-
-// Returns true if ISP blocking was detected
-func CheckAndLogISPBlocking(err error, requestURL string, tag string) bool {
-	ispErr := IsISPBlocking(err, requestURL)
-	if ispErr != nil {
-		LogError(tag, "ISP BLOCKING DETECTED: %s", ispErr.Error())
-		LogError(tag, "Domain: %s", ispErr.Domain)
-		LogError(tag, "Reason: %s", ispErr.Reason)
-		LogError(tag, "Original error: %v", ispErr.OriginalErr)
-		LogError(tag, "Suggestion: Try using a VPN or changing your DNS to 1.1.1.1 or 8.8.8.8")
-		return true
-	}
-	return false
-}
-
-// extractDomain extracts the domain from a URL string
-func extractDomain(rawURL string) string {
-	if rawURL == "" {
-		return "unknown"
-	}
-
-	parsed, err := url.Parse(rawURL)
-	if err != nil {
-		rawURL = strings.TrimPrefix(rawURL, "https://")
-		rawURL = strings.TrimPrefix(rawURL, "http://")
-		if idx := strings.Index(rawURL, "/"); idx > 0 {
-			return rawURL[:idx]
-		}
-		return rawURL
-	}
-
-	if parsed.Host != "" {
-		return parsed.Host
-	}
-	return "unknown"
-}
-
-// If ISP blocking is detected, returns a more descriptive error
-func WrapErrorWithISPCheck(err error, requestURL string, tag string) error {
-	if err == nil {
-		return nil
-	}
-
-	if CheckAndLogISPBlocking(err, requestURL, tag) {
-		domain := extractDomain(requestURL)
-		return fmt.Errorf("ISP blocking detected for %s - try using VPN or change DNS to 1.1.1.1/8.8.8.8: %w", domain, err)
-	}
-
-	return err
-}

go_backend/httputil_ios.go

@@ -1,27 +0,0 @@
-//go:build ios
-
-package gobackend
-
-import (
-	"net/http"
-)
-
-// iOS version: uTLS is not supported on iOS due to cgo DNS resolver issues
-// Fall back to standard HTTP client
-
-// GetCloudflareBypassClient returns the standard HTTP client on iOS
-// uTLS is not available on iOS due to cgo DNS resolver compatibility issues
-func GetCloudflareBypassClient() *http.Client {
-	return sharedClient
-}
-
-// DoRequestWithCloudflareBypass on iOS just uses the standard client
-// uTLS Chrome fingerprint bypass is not available on iOS
-func DoRequestWithCloudflareBypass(req *http.Request) (*http.Response, error) {
-	req.Header.Set("User-Agent", getRandomUserAgent())
-	resp, err := sharedClient.Do(req)
-	if err != nil {
-		CheckAndLogISPBlocking(err, req.URL.String(), "HTTP")
-	}
-	return resp, err
-}

go_backend/httputil_utls.go

@@ -1,181 +0,0 @@
-//go:build !ios
-
-package gobackend
-
-import (
-	"context"
-	"crypto/tls"
-	"io"
-	"net"
-	"net/http"
-	"net/url"
-	"strings"
-	"sync"
-
-	utls "github.com/refraction-networking/utls"
-	"golang.org/x/net/http2"
-)
-
-// uTLS transport that mimics Chrome's TLS fingerprint to bypass Cloudflare
-// Uses HTTP/2 for optimal performance as uTLS works best with HTTP/2
-type utlsTransport struct {
-	dialer       *net.Dialer
-	mu           sync.Mutex
-	h2Transports map[string]*http2.Transport
-}
-
-func newUTLSTransport() *utlsTransport {
-	return &utlsTransport{
-		dialer: &net.Dialer{
-			Timeout:   30 * Second,
-			KeepAlive: 30 * Second,
-		},
-		h2Transports: make(map[string]*http2.Transport),
-	}
-}
-
-func (t *utlsTransport) RoundTrip(req *http.Request) (*http.Response, error) {
-	if req.URL.Scheme != "https" {
-		return sharedTransport.RoundTrip(req)
-	}
-
-	host := req.URL.Hostname()
-	port := t.getPort(req.URL)
-	addr := net.JoinHostPort(host, port)
-
-	conn, err := t.dialer.DialContext(req.Context(), "tcp", addr)
-	if err != nil {
-		return nil, err
-	}
-
-	tlsConn := utls.UClient(conn, &utls.Config{
-		ServerName: host,
-		NextProtos: []string{"h2", "http/1.1"},
-	}, utls.HelloChrome_Auto)
-
-	if err := tlsConn.Handshake(); err != nil {
-		conn.Close()
-		return nil, err
-	}
-
-	negotiatedProto := tlsConn.ConnectionState().NegotiatedProtocol
-
-	if negotiatedProto == "h2" {
-		h2Transport := &http2.Transport{
-			DialTLSContext: func(ctx context.Context, network, addr string, cfg *tls.Config) (net.Conn, error) {
-				return tlsConn, nil
-			},
-			AllowHTTP:          false,
-			DisableCompression: false,
-		}
-		return h2Transport.RoundTrip(req)
-	}
-
-	transport := &http.Transport{
-		DialTLSContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
-			return tlsConn, nil
-		},
-		DisableKeepAlives: true,
-	}
-
-	return transport.RoundTrip(req)
-}
-
-func (t *utlsTransport) getPort(u *url.URL) string {
-	if u.Port() != "" {
-		return u.Port()
-	}
-	if u.Scheme == "https" {
-		return "443"
-	}
-	return "80"
-}
-
-// Cloudflare bypass client using uTLS Chrome fingerprint
-var cloudflareBypassTransport = newUTLSTransport()
-
-var cloudflareBypassClient = &http.Client{
-	Transport: cloudflareBypassTransport,
-	Timeout:   DefaultTimeout,
-}
-
-// GetCloudflareBypassClient returns an HTTP client that mimics Chrome's TLS fingerprint
-// Use this when requests are blocked by Cloudflare (common when using VPN)
-func GetCloudflareBypassClient() *http.Client {
-	return cloudflareBypassClient
-}
-
-// DoRequestWithCloudflareBypass attempts request with standard client first,
-// then retries with uTLS Chrome fingerprint if Cloudflare blocks it.
-// This is useful when using VPN as Cloudflare detects Go's default TLS fingerprint.
-func DoRequestWithCloudflareBypass(req *http.Request) (*http.Response, error) {
-	req.Header.Set("User-Agent", getRandomUserAgent())
-
-	// Try with standard client first
-	resp, err := sharedClient.Do(req)
-	if err == nil {
-		// Check for Cloudflare challenge page (403 with specific markers)
-		if resp.StatusCode == 403 || resp.StatusCode == 503 {
-			body, readErr := io.ReadAll(resp.Body)
-			resp.Body.Close()
-
-			if readErr == nil {
-				bodyStr := strings.ToLower(string(body))
-				cloudflareMarkers := []string{
-					"cloudflare", "cf-ray", "checking your browser",
-					"please wait", "ddos protection", "ray id",
-					"enable javascript", "challenge-platform",
-				}
-
-				isCloudflare := false
-				for _, marker := range cloudflareMarkers {
-					if strings.Contains(bodyStr, marker) {
-						isCloudflare = true
-						break
-					}
-				}
-
-				if isCloudflare {
-					LogDebug("HTTP", "Cloudflare detected, retrying with Chrome TLS fingerprint...")
-
-					// Clone request for retry
-					reqCopy := req.Clone(req.Context())
-					reqCopy.Header.Set("User-Agent", getRandomUserAgent())
-
-					// Retry with uTLS Chrome fingerprint
-					return cloudflareBypassClient.Do(reqCopy)
-				}
-			}
-
-			// Not Cloudflare, return original response (recreate body)
-			return &http.Response{
-				Status:     resp.Status,
-				StatusCode: resp.StatusCode,
-				Header:     resp.Header,
-				Body:       io.NopCloser(strings.NewReader(string(body))),
-			}, nil
-		}
-		return resp, nil
-	}
-
-	// Check if error might be TLS-related (Cloudflare blocking)
-	errStr := strings.ToLower(err.Error())
-	tlsRelated := strings.Contains(errStr, "tls") ||
-		strings.Contains(errStr, "handshake") ||
-		strings.Contains(errStr, "certificate") ||
-		strings.Contains(errStr, "connection reset")
-
-	if tlsRelated {
-		LogDebug("HTTP", "TLS error detected, retrying with Chrome TLS fingerprint: %v", err)
-
-		// Clone request for retry
-		reqCopy := req.Clone(req.Context())
-		reqCopy.Header.Set("User-Agent", getRandomUserAgent())
-
-		// Retry with uTLS Chrome fingerprint
-		return cloudflareBypassClient.Do(reqCopy)
-	}
-
-	CheckAndLogISPBlocking(err, req.URL.String(), "HTTP")
-	return nil, err
-}

go_backend/idhs.go

@@ -1,189 +0,0 @@
-package gobackend
-
-import (
-	"bytes"
-	"encoding/json"
-	"fmt"
-	"net/http"
-	"strings"
-	"sync"
-	"time"
-)
-
-// IDHSClient is a client for I Don't Have Spotify API
-// Used as fallback when SongLink fails or is rate limited
-type IDHSClient struct {
-	client *http.Client
-}
-
-var (
-	globalIDHSClient *IDHSClient
-	idhsClientOnce   sync.Once
-	idhsRateLimiter  = NewRateLimiter(8, time.Minute) // 8 req/min (below 10 limit)
-)
-
-// IDHSSearchRequest represents the request body for IDHS API
-type IDHSSearchRequest struct {
-	Link     string   `json:"link"`
-	Adapters []string `json:"adapters,omitempty"`
-}
-
-// IDHSSearchResponse represents the response from IDHS API
-type IDHSSearchResponse struct {
-	ID            string     `json:"id"`
-	Type          string     `json:"type"` // song, album, artist, podcast, show
-	Title         string     `json:"title"`
-	Description   string     `json:"description"`
-	Image         string     `json:"image,omitempty"`
-	Audio         string     `json:"audio,omitempty"`
-	Source        string     `json:"source"`
-	UniversalLink string     `json:"universalLink"`
-	Links         []IDHSLink `json:"links"`
-}
-
-// IDHSLink represents a link to a streaming platform
-type IDHSLink struct {
-	Type         string `json:"type"` // spotify, youTube, appleMusic, deezer, soundCloud, tidal
-	URL          string `json:"url"`
-	IsVerified   bool   `json:"isVerified,omitempty"`
-	NotAvailable bool   `json:"notAvailable,omitempty"`
-}
-
-// NewIDHSClient creates a new IDHS client
-func NewIDHSClient() *IDHSClient {
-	idhsClientOnce.Do(func() {
-		globalIDHSClient = &IDHSClient{
-			client: NewHTTPClientWithTimeout(15 * time.Second),
-		}
-	})
-	return globalIDHSClient
-}
-
-// Search converts a music link to links on other platforms
-func (c *IDHSClient) Search(link string, adapters []string) (*IDHSSearchResponse, error) {
-	idhsRateLimiter.WaitForSlot()
-
-	reqBody := IDHSSearchRequest{
-		Link:     link,
-		Adapters: adapters,
-	}
-
-	jsonBody, err := json.Marshal(reqBody)
-	if err != nil {
-		return nil, fmt.Errorf("failed to marshal request: %w", err)
-	}
-
-	req, err := http.NewRequest("POST", "https://idonthavespotify.sjdonado.com/api/search?v=1", bytes.NewBuffer(jsonBody))
-	if err != nil {
-		return nil, fmt.Errorf("failed to create request: %w", err)
-	}
-
-	req.Header.Set("Content-Type", "application/json")
-	req.Header.Set("User-Agent", getRandomUserAgent())
-
-	resp, err := c.client.Do(req)
-	if err != nil {
-		return nil, fmt.Errorf("request failed: %w", err)
-	}
-	defer resp.Body.Close()
-
-	if resp.StatusCode == 400 {
-		return nil, fmt.Errorf("invalid link or missing parameters")
-	}
-	if resp.StatusCode == 429 {
-		return nil, fmt.Errorf("IDHS rate limit exceeded")
-	}
-	if resp.StatusCode == 500 {
-		return nil, fmt.Errorf("IDHS processing failed")
-	}
-	if resp.StatusCode != 200 {
-		return nil, fmt.Errorf("IDHS API returned status %d", resp.StatusCode)
-	}
-
-	body, err := ReadResponseBody(resp)
-	if err != nil {
-		return nil, fmt.Errorf("failed to read response: %w", err)
-	}
-
-	var result IDHSSearchResponse
-	if err := json.Unmarshal(body, &result); err != nil {
-		return nil, fmt.Errorf("failed to decode response: %w", err)
-	}
-
-	return &result, nil
-}
-
-// GetAvailabilityFromSpotify checks track availability using IDHS as fallback
-func (c *IDHSClient) GetAvailabilityFromSpotify(spotifyTrackID string) (*TrackAvailability, error) {
-	spotifyURL := fmt.Sprintf("https://open.spotify.com/track/%s", spotifyTrackID)
-
-	// Request only the platforms we need
-	adapters := []string{"tidal", "deezer"}
-
-	result, err := c.Search(spotifyURL, adapters)
-	if err != nil {
-		return nil, err
-	}
-
-	availability := &TrackAvailability{
-		SpotifyID: spotifyTrackID,
-	}
-
-	for _, link := range result.Links {
-		if link.NotAvailable {
-			continue
-		}
-
-		switch strings.ToLower(link.Type) {
-		case "tidal":
-			availability.Tidal = true
-			availability.TidalURL = link.URL
-		case "deezer":
-			availability.Deezer = true
-			availability.DeezerURL = link.URL
-			availability.DeezerID = extractDeezerIDFromURL(link.URL)
-		}
-	}
-
-	LogDebug("IDHS", "Availability from Spotify %s: Tidal=%v, Deezer=%v",
-		spotifyTrackID, availability.Tidal, availability.Deezer)
-
-	return availability, nil
-}
-
-// GetAvailabilityFromDeezer checks track availability using IDHS
-func (c *IDHSClient) GetAvailabilityFromDeezer(deezerTrackID string) (*TrackAvailability, error) {
-	deezerURL := fmt.Sprintf("https://www.deezer.com/track/%s", deezerTrackID)
-
-	// Request only the platforms we need
-	adapters := []string{"spotify", "tidal"}
-
-	result, err := c.Search(deezerURL, adapters)
-	if err != nil {
-		return nil, err
-	}
-
-	availability := &TrackAvailability{
-		Deezer:   true,
-		DeezerID: deezerTrackID,
-	}
-
-	for _, link := range result.Links {
-		if link.NotAvailable {
-			continue
-		}
-
-		switch strings.ToLower(link.Type) {
-		case "spotify":
-			availability.SpotifyID = extractSpotifyIDFromURL(link.URL)
-		case "tidal":
-			availability.Tidal = true
-			availability.TidalURL = link.URL
-		}
-	}
-
-	LogDebug("IDHS", "Availability from Deezer %s: Spotify=%s, Tidal=%v",
-		deezerTrackID, availability.SpotifyID, availability.Tidal)
-
-	return availability, nil
-}

go_backend/library_scan.go

@@ -1,609 +0,0 @@
-package gobackend
-
-import (
-	"encoding/json"
-	"fmt"
-	"os"
-	"path/filepath"
-	"strings"
-	"sync"
-	"time"
-)
-
-// LibraryScanResult represents metadata from a scanned audio file
-type LibraryScanResult struct {
-	ID          string `json:"id"`
-	TrackName   string `json:"trackName"`
-	ArtistName  string `json:"artistName"`
-	AlbumName   string `json:"albumName"`
-	AlbumArtist string `json:"albumArtist,omitempty"`
-	FilePath    string `json:"filePath"`
-	CoverPath   string `json:"coverPath,omitempty"`
-	ScannedAt   string `json:"scannedAt"`
-	FileModTime int64  `json:"fileModTime,omitempty"` // Unix timestamp in milliseconds
-	ISRC        string `json:"isrc,omitempty"`
-	TrackNumber int    `json:"trackNumber,omitempty"`
-	DiscNumber  int    `json:"discNumber,omitempty"`
-	Duration    int    `json:"duration,omitempty"`
-	ReleaseDate string `json:"releaseDate,omitempty"`
-	BitDepth    int    `json:"bitDepth,omitempty"`
-	SampleRate  int    `json:"sampleRate,omitempty"`
-	Genre       string `json:"genre,omitempty"`
-	Format      string `json:"format,omitempty"`
-}
-
-type LibraryScanProgress struct {
-	TotalFiles   int     `json:"total_files"`
-	ScannedFiles int     `json:"scanned_files"`
-	CurrentFile  string  `json:"current_file"`
-	ErrorCount   int     `json:"error_count"`
-	ProgressPct  float64 `json:"progress_pct"`
-	IsComplete   bool    `json:"is_complete"`
-}
-
-// IncrementalScanResult contains results of an incremental library scan
-type IncrementalScanResult struct {
-	Scanned      []LibraryScanResult `json:"scanned"`      // New or updated files
-	DeletedPaths []string            `json:"deletedPaths"` // Files that no longer exist
-	SkippedCount int                 `json:"skippedCount"` // Files that were unchanged
-	TotalFiles   int                 `json:"totalFiles"`   // Total files in folder
-}
-
-var (
-	libraryScanProgress   LibraryScanProgress
-	libraryScanProgressMu sync.RWMutex
-	libraryScanCancel     chan struct{}
-	libraryScanCancelMu   sync.Mutex
-	libraryCoverCacheDir  string
-	libraryCoverCacheMu   sync.RWMutex
-)
-
-var supportedAudioFormats = map[string]bool{
-	".flac": true,
-	".m4a":  true,
-	".mp3":  true,
-	".opus": true,
-	".ogg":  true,
-}
-
-func SetLibraryCoverCacheDir(cacheDir string) {
-	libraryCoverCacheMu.Lock()
-	libraryCoverCacheDir = cacheDir
-	libraryCoverCacheMu.Unlock()
-}
-
-func ScanLibraryFolder(folderPath string) (string, error) {
-	if folderPath == "" {
-		return "[]", fmt.Errorf("folder path is empty")
-	}
-
-	info, err := os.Stat(folderPath)
-	if err != nil {
-		return "[]", fmt.Errorf("folder not found: %w", err)
-	}
-	if !info.IsDir() {
-		return "[]", fmt.Errorf("path is not a folder: %s", folderPath)
-	}
-
-	libraryScanProgressMu.Lock()
-	libraryScanProgress = LibraryScanProgress{}
-	libraryScanProgressMu.Unlock()
-
-	libraryScanCancelMu.Lock()
-	if libraryScanCancel != nil {
-		close(libraryScanCancel)
-	}
-	libraryScanCancel = make(chan struct{})
-	cancelCh := libraryScanCancel
-	libraryScanCancelMu.Unlock()
-
-	var audioFiles []string
-	err = filepath.Walk(folderPath, func(path string, info os.FileInfo, err error) error {
-		if err != nil {
-			return nil
-		}
-
-		select {
-		case <-cancelCh:
-			return fmt.Errorf("scan cancelled")
-		default:
-		}
-
-		if !info.IsDir() {
-			ext := strings.ToLower(filepath.Ext(path))
-			if supportedAudioFormats[ext] {
-				audioFiles = append(audioFiles, path)
-			}
-		}
-		return nil
-	})
-
-	if err != nil {
-		return "[]", err
-	}
-
-	totalFiles := len(audioFiles)
-	libraryScanProgressMu.Lock()
-	libraryScanProgress.TotalFiles = totalFiles
-	libraryScanProgressMu.Unlock()
-
-	if totalFiles == 0 {
-		libraryScanProgressMu.Lock()
-		libraryScanProgress.IsComplete = true
-		libraryScanProgressMu.Unlock()
-		return "[]", nil
-	}
-
-	GoLog("[LibraryScan] Found %d audio files to scan\n", totalFiles)
-
-	results := make([]LibraryScanResult, 0, totalFiles)
-	scanTime := time.Now().UTC().Format(time.RFC3339)
-	errorCount := 0
-
-	for i, filePath := range audioFiles {
-		select {
-		case <-cancelCh:
-			return "[]", fmt.Errorf("scan cancelled")
-		default:
-		}
-
-		libraryScanProgressMu.Lock()
-		libraryScanProgress.ScannedFiles = i + 1
-		libraryScanProgress.CurrentFile = filepath.Base(filePath)
-		libraryScanProgress.ProgressPct = float64(i+1) / float64(totalFiles) * 100
-		libraryScanProgressMu.Unlock()
-
-		result, err := scanAudioFile(filePath, scanTime)
-		if err != nil {
-			errorCount++
-			GoLog("[LibraryScan] Error scanning %s: %v\n", filePath, err)
-			continue
-		}
-
-		results = append(results, *result)
-	}
-
-	libraryScanProgressMu.Lock()
-	libraryScanProgress.ErrorCount = errorCount
-	libraryScanProgress.IsComplete = true
-	libraryScanProgressMu.Unlock()
-
-	GoLog("[LibraryScan] Scan complete: %d tracks found, %d errors\n", len(results), errorCount)
-
-	jsonBytes, err := json.Marshal(results)
-	if err != nil {
-		return "[]", fmt.Errorf("failed to marshal results: %w", err)
-	}
-
-	return string(jsonBytes), nil
-}
-
-func scanAudioFile(filePath, scanTime string) (*LibraryScanResult, error) {
-	ext := strings.ToLower(filepath.Ext(filePath))
-
-	result := &LibraryScanResult{
-		ID:        generateLibraryID(filePath),
-		FilePath:  filePath,
-		ScannedAt: scanTime,
-		Format:    strings.TrimPrefix(ext, "."),
-	}
-
-	// Get file modification time
-	if info, err := os.Stat(filePath); err == nil {
-		result.FileModTime = info.ModTime().UnixMilli()
-	}
-
-	libraryCoverCacheMu.RLock()
-	coverCacheDir := libraryCoverCacheDir
-	libraryCoverCacheMu.RUnlock()
-	if coverCacheDir != "" && ext != ".m4a" {
-		coverPath, err := SaveCoverToCache(filePath, coverCacheDir)
-		if err == nil && coverPath != "" {
-			result.CoverPath = coverPath
-		}
-	}
-
-	switch ext {
-	case ".flac":
-		return scanFLACFile(filePath, result)
-	case ".m4a":
-		return scanM4AFile(filePath, result)
-	case ".mp3":
-		return scanMP3File(filePath, result)
-	case ".opus", ".ogg":
-		return scanOggFile(filePath, result)
-	default:
-		return scanFromFilename(filePath, result)
-	}
-}
-
-func scanFLACFile(filePath string, result *LibraryScanResult) (*LibraryScanResult, error) {
-	metadata, err := ReadMetadata(filePath)
-	if err != nil {
-		return scanFromFilename(filePath, result)
-	}
-
-	result.TrackName = metadata.Title
-	result.ArtistName = metadata.Artist
-	result.AlbumName = metadata.Album
-	result.AlbumArtist = metadata.AlbumArtist
-	result.ISRC = metadata.ISRC
-	result.TrackNumber = metadata.TrackNumber
-	result.DiscNumber = metadata.DiscNumber
-	result.ReleaseDate = metadata.Date
-	result.Genre = metadata.Genre
-
-	quality, err := GetAudioQuality(filePath)
-	if err == nil {
-		result.BitDepth = quality.BitDepth
-		result.SampleRate = quality.SampleRate
-		if quality.SampleRate > 0 && quality.TotalSamples > 0 {
-			result.Duration = int(quality.TotalSamples / int64(quality.SampleRate))
-		}
-	}
-
-	if result.TrackName == "" {
-		result.TrackName = strings.TrimSuffix(filepath.Base(filePath), filepath.Ext(filePath))
-	}
-	if result.ArtistName == "" {
-		result.ArtistName = "Unknown Artist"
-	}
-	if result.AlbumName == "" {
-		result.AlbumName = "Unknown Album"
-	}
-
-	return result, nil
-}
-
-func scanM4AFile(filePath string, result *LibraryScanResult) (*LibraryScanResult, error) {
-	quality, err := GetM4AQuality(filePath)
-	if err == nil {
-		result.BitDepth = quality.BitDepth
-		result.SampleRate = quality.SampleRate
-	}
-
-	return scanFromFilename(filePath, result)
-}
-
-func scanMP3File(filePath string, result *LibraryScanResult) (*LibraryScanResult, error) {
-	metadata, err := ReadID3Tags(filePath)
-	if err != nil {
-		GoLog("[LibraryScan] ID3 read error for %s: %v\n", filePath, err)
-		return scanFromFilename(filePath, result)
-	}
-
-	result.TrackName = metadata.Title
-	result.ArtistName = metadata.Artist
-	result.AlbumName = metadata.Album
-	result.AlbumArtist = metadata.AlbumArtist
-	result.TrackNumber = metadata.TrackNumber
-	result.DiscNumber = metadata.DiscNumber
-	result.Genre = metadata.Genre
-	if metadata.Date != "" {
-		result.ReleaseDate = metadata.Date
-	} else {
-		result.ReleaseDate = metadata.Year
-	}
-	result.ISRC = metadata.ISRC
-
-	quality, err := GetMP3Quality(filePath)
-	if err == nil {
-		result.SampleRate = quality.SampleRate
-		result.BitDepth = quality.BitDepth
-		result.Duration = quality.Duration
-	}
-
-	if result.TrackName == "" {
-		result.TrackName = strings.TrimSuffix(filepath.Base(filePath), filepath.Ext(filePath))
-	}
-	if result.ArtistName == "" {
-		result.ArtistName = "Unknown Artist"
-	}
-	if result.AlbumName == "" {
-		result.AlbumName = "Unknown Album"
-	}
-
-	return result, nil
-}
-
-func scanOggFile(filePath string, result *LibraryScanResult) (*LibraryScanResult, error) {
-	metadata, err := ReadOggVorbisComments(filePath)
-	if err != nil {
-		GoLog("[LibraryScan] Ogg/Opus read error for %s: %v\n", filePath, err)
-		return scanFromFilename(filePath, result)
-	}
-
-	result.TrackName = metadata.Title
-	result.ArtistName = metadata.Artist
-	result.AlbumName = metadata.Album
-	result.AlbumArtist = metadata.AlbumArtist
-	result.ISRC = metadata.ISRC
-	result.TrackNumber = metadata.TrackNumber
-	result.DiscNumber = metadata.DiscNumber
-	result.Genre = metadata.Genre
-	result.ReleaseDate = metadata.Date
-
-	quality, err := GetOggQuality(filePath)
-	if err == nil {
-		result.SampleRate = quality.SampleRate
-		result.BitDepth = quality.BitDepth
-		result.Duration = quality.Duration
-	}
-
-	if result.TrackName == "" {
-		result.TrackName = strings.TrimSuffix(filepath.Base(filePath), filepath.Ext(filePath))
-	}
-	if result.ArtistName == "" {
-		result.ArtistName = "Unknown Artist"
-	}
-	if result.AlbumName == "" {
-		result.AlbumName = "Unknown Album"
-	}
-
-	return result, nil
-}
-
-func scanFromFilename(filePath string, result *LibraryScanResult) (*LibraryScanResult, error) {
-	filename := strings.TrimSuffix(filepath.Base(filePath), filepath.Ext(filePath))
-
-	parts := strings.SplitN(filename, " - ", 2)
-	if len(parts) == 2 {
-		if len(parts[0]) <= 3 && isNumeric(parts[0]) {
-			result.TrackName = parts[1]
-			result.ArtistName = "Unknown Artist"
-		} else {
-			result.ArtistName = parts[0]
-			result.TrackName = parts[1]
-		}
-	} else {
-		if len(filename) > 3 && isNumeric(filename[:2]) {
-			title := strings.TrimLeft(filename[2:], " .-")
-			result.TrackName = title
-		} else {
-			result.TrackName = filename
-		}
-		result.ArtistName = "Unknown Artist"
-	}
-
-	dir := filepath.Dir(filePath)
-	result.AlbumName = filepath.Base(dir)
-	if result.AlbumName == "." || result.AlbumName == "" {
-		result.AlbumName = "Unknown Album"
-	}
-
-	return result, nil
-}
-
-func isNumeric(s string) bool {
-	for _, c := range s {
-		if c < '0' || c > '9' {
-			return false
-		}
-	}
-	return len(s) > 0
-}
-
-func generateLibraryID(filePath string) string {
-	return fmt.Sprintf("lib_%x", hashString(filePath))
-}
-
-func hashString(s string) uint32 {
-	var hash uint32 = 5381
-	for _, c := range s {
-		hash = ((hash << 5) + hash) + uint32(c)
-	}
-	return hash
-}
-
-func GetLibraryScanProgress() string {
-	libraryScanProgressMu.RLock()
-	defer libraryScanProgressMu.RUnlock()
-
-	jsonBytes, _ := json.Marshal(libraryScanProgress)
-	return string(jsonBytes)
-}
-
-func CancelLibraryScan() {
-	libraryScanCancelMu.Lock()
-	defer libraryScanCancelMu.Unlock()
-
-	if libraryScanCancel != nil {
-		close(libraryScanCancel)
-		libraryScanCancel = nil
-	}
-}
-
-func ReadAudioMetadata(filePath string) (string, error) {
-	scanTime := time.Now().UTC().Format(time.RFC3339)
-	result, err := scanAudioFile(filePath, scanTime)
-	if err != nil {
-		return "", err
-	}
-
-	jsonBytes, err := json.Marshal(result)
-	if err != nil {
-		return "", fmt.Errorf("failed to marshal result: %w", err)
-	}
-
-	return string(jsonBytes), nil
-}
-
-// ScanLibraryFolderIncremental performs an incremental scan of the library folder
-// existingFilesJSON is a JSON object mapping filePath -> modTime (unix millis)
-// Only files that are new or have changed modification time will be scanned
-func ScanLibraryFolderIncremental(folderPath, existingFilesJSON string) (string, error) {
-	if folderPath == "" {
-		return "{}", fmt.Errorf("folder path is empty")
-	}
-
-	info, err := os.Stat(folderPath)
-	if err != nil {
-		return "{}", fmt.Errorf("folder not found: %w", err)
-	}
-	if !info.IsDir() {
-		return "{}", fmt.Errorf("path is not a folder: %s", folderPath)
-	}
-
-	// Parse existing files map
-	existingFiles := make(map[string]int64)
-	if existingFilesJSON != "" && existingFilesJSON != "{}" {
-		if err := json.Unmarshal([]byte(existingFilesJSON), &existingFiles); err != nil {
-			GoLog("[LibraryScan] Warning: failed to parse existing files JSON: %v\n", err)
-		}
-	}
-
-	GoLog("[LibraryScan] Incremental scan starting, %d existing files in database\n", len(existingFiles))
-
-	// Reset progress
-	libraryScanProgressMu.Lock()
-	libraryScanProgress = LibraryScanProgress{}
-	libraryScanProgressMu.Unlock()
-
-	// Setup cancellation
-	libraryScanCancelMu.Lock()
-	if libraryScanCancel != nil {
-		close(libraryScanCancel)
-	}
-	libraryScanCancel = make(chan struct{})
-	cancelCh := libraryScanCancel
-	libraryScanCancelMu.Unlock()
-
-	// Collect all audio files with their mod times
-	type fileInfo struct {
-		path    string
-		modTime int64
-	}
-	var currentFiles []fileInfo
-	currentPathSet := make(map[string]bool)
-
-	err = filepath.Walk(folderPath, func(path string, info os.FileInfo, err error) error {
-		if err != nil {
-			return nil
-		}
-
-		select {
-		case <-cancelCh:
-			return fmt.Errorf("scan cancelled")
-		default:
-		}
-
-		if !info.IsDir() {
-			ext := strings.ToLower(filepath.Ext(path))
-			if supportedAudioFormats[ext] {
-				currentFiles = append(currentFiles, fileInfo{
-					path:    path,
-					modTime: info.ModTime().UnixMilli(),
-				})
-				currentPathSet[path] = true
-			}
-		}
-		return nil
-	})
-
-	if err != nil {
-		return "{}", err
-	}
-
-	totalFiles := len(currentFiles)
-	libraryScanProgressMu.Lock()
-	libraryScanProgress.TotalFiles = totalFiles
-	libraryScanProgressMu.Unlock()
-
-	// Find files to scan (new or modified)
-	var filesToScan []fileInfo
-	skippedCount := 0
-
-	for _, f := range currentFiles {
-		existingModTime, exists := existingFiles[f.path]
-		if !exists {
-			// New file
-			filesToScan = append(filesToScan, f)
-		} else if f.modTime != existingModTime {
-			// Modified file
-			filesToScan = append(filesToScan, f)
-		} else {
-			// Unchanged file - skip
-			skippedCount++
-		}
-	}
-
-	// Find deleted files
-	var deletedPaths []string
-	for existingPath := range existingFiles {
-		if !currentPathSet[existingPath] {
-			deletedPaths = append(deletedPaths, existingPath)
-		}
-	}
-
-	GoLog("[LibraryScan] Incremental: %d to scan, %d skipped, %d deleted\n",
-		len(filesToScan), skippedCount, len(deletedPaths))
-
-	if len(filesToScan) == 0 {
-		libraryScanProgressMu.Lock()
-		libraryScanProgress.ScannedFiles = totalFiles
-		libraryScanProgress.IsComplete = true
-		libraryScanProgress.ProgressPct = 100
-		libraryScanProgressMu.Unlock()
-
-		result := IncrementalScanResult{
-			Scanned:      []LibraryScanResult{},
-			DeletedPaths: deletedPaths,
-			SkippedCount: skippedCount,
-			TotalFiles:   totalFiles,
-		}
-		jsonBytes, _ := json.Marshal(result)
-		return string(jsonBytes), nil
-	}
-
-	// Scan the files that need scanning
-	results := make([]LibraryScanResult, 0, len(filesToScan))
-	scanTime := time.Now().UTC().Format(time.RFC3339)
-	errorCount := 0
-
-	for i, f := range filesToScan {
-		select {
-		case <-cancelCh:
-			return "{}", fmt.Errorf("scan cancelled")
-		default:
-		}
-
-		libraryScanProgressMu.Lock()
-		libraryScanProgress.ScannedFiles = skippedCount + i + 1
-		libraryScanProgress.CurrentFile = filepath.Base(f.path)
-		libraryScanProgress.ProgressPct = float64(skippedCount+i+1) / float64(totalFiles) * 100
-		libraryScanProgressMu.Unlock()
-
-		result, err := scanAudioFile(f.path, scanTime)
-		if err != nil {
-			errorCount++
-			GoLog("[LibraryScan] Error scanning %s: %v\n", f.path, err)
-			continue
-		}
-
-		results = append(results, *result)
-	}
-
-	libraryScanProgressMu.Lock()
-	libraryScanProgress.ErrorCount = errorCount
-	libraryScanProgress.IsComplete = true
-	libraryScanProgress.ScannedFiles = totalFiles
-	libraryScanProgress.ProgressPct = 100
-	libraryScanProgressMu.Unlock()
-
-	GoLog("[LibraryScan] Incremental scan complete: %d scanned, %d skipped, %d deleted, %d errors\n",
-		len(results), skippedCount, len(deletedPaths), errorCount)
-
-	scanResult := IncrementalScanResult{
-		Scanned:      results,
-		DeletedPaths: deletedPaths,
-		SkippedCount: skippedCount,
-		TotalFiles:   totalFiles,
-	}
-
-	jsonBytes, err := json.Marshal(scanResult)
-	if err != nil {
-		return "{}", fmt.Errorf("failed to marshal results: %w", err)
-	}
-
-	return string(jsonBytes), nil
-}

go_backend/logbuffer.go

@@ -1,181 +0,0 @@
-package gobackend
-
-import (
-	"encoding/json"
-	"fmt"
-	"strings"
-	"sync"
-	"time"
-)
-
-type LogEntry struct {
-	Timestamp string `json:"timestamp"`
-	Level     string `json:"level"`
-	Tag       string `json:"tag"`
-	Message   string `json:"message"`
-}
-
-type LogBuffer struct {
-	entries        []LogEntry
-	maxSize        int
-	mu             sync.RWMutex
-	loggingEnabled bool
-}
-
-var (
-	globalLogBuffer *LogBuffer
-	logBufferOnce   sync.Once
-)
-
-func GetLogBuffer() *LogBuffer {
-	logBufferOnce.Do(func() {
-		globalLogBuffer = &LogBuffer{
-			entries:        make([]LogEntry, 0, 1000),
-			maxSize:        1000,
-			loggingEnabled: false, // Default: disabled for performance (user can enable in settings)
-		}
-	})
-	return globalLogBuffer
-}
-
-func (lb *LogBuffer) SetLoggingEnabled(enabled bool) {
-	lb.mu.Lock()
-	defer lb.mu.Unlock()
-	lb.loggingEnabled = enabled
-}
-
-func (lb *LogBuffer) IsLoggingEnabled() bool {
-	lb.mu.RLock()
-	defer lb.mu.RUnlock()
-	return lb.loggingEnabled
-}
-
-func (lb *LogBuffer) Add(level, tag, message string) {
-	lb.mu.Lock()
-	defer lb.mu.Unlock()
-
-	if !lb.loggingEnabled && level != "ERROR" && level != "FATAL" {
-		return
-	}
-
-	entry := LogEntry{
-		Timestamp: time.Now().Format("15:04:05.000"),
-		Level:     level,
-		Tag:       tag,
-		Message:   message,
-	}
-
-	if len(lb.entries) >= lb.maxSize {
-		lb.entries = lb.entries[1:]
-	}
-	lb.entries = append(lb.entries, entry)
-
-	fmt.Printf("[%s] %s\n", tag, message)
-}
-
-func (lb *LogBuffer) GetAll() string {
-	lb.mu.RLock()
-	defer lb.mu.RUnlock()
-
-	jsonBytes, _ := json.Marshal(lb.entries)
-	return string(jsonBytes)
-}
-
-func (lb *LogBuffer) getSince(index int) ([]LogEntry, int) {
-	lb.mu.RLock()
-	defer lb.mu.RUnlock()
-
-	if index < 0 {
-		index = 0
-	}
-	if index >= len(lb.entries) {
-		return []LogEntry{}, len(lb.entries)
-	}
-
-	entries := lb.entries[index:]
-	return entries, len(lb.entries)
-}
-
-func (lb *LogBuffer) Clear() {
-	lb.mu.Lock()
-	defer lb.mu.Unlock()
-	lb.entries = lb.entries[:0]
-}
-
-func (lb *LogBuffer) Count() int {
-	lb.mu.RLock()
-	defer lb.mu.RUnlock()
-	return len(lb.entries)
-}
-
-func LogDebug(tag, format string, args ...interface{}) {
-	GetLogBuffer().Add("DEBUG", tag, fmt.Sprintf(format, args...))
-}
-
-func LogInfo(tag, format string, args ...interface{}) {
-	GetLogBuffer().Add("INFO", tag, fmt.Sprintf(format, args...))
-}
-
-func LogWarn(tag, format string, args ...interface{}) {
-	GetLogBuffer().Add("WARN", tag, fmt.Sprintf(format, args...))
-}
-
-func LogError(tag, format string, args ...interface{}) {
-	GetLogBuffer().Add("ERROR", tag, fmt.Sprintf(format, args...))
-}
-
-// GoLog is a drop-in replacement for fmt.Printf that also logs to buffer
-// It parses the tag from the format string if it starts with [Tag]
-func GoLog(format string, args ...interface{}) {
-	message := fmt.Sprintf(format, args...)
-	message = strings.TrimSuffix(message, "\n")
-
-	// Extract tag from message if present (e.g., "[Tidal] message")
-	tag := "Go"
-	level := "INFO"
-
-	if strings.HasPrefix(message, "[") {
-		endBracket := strings.Index(message, "]")
-		if endBracket > 1 {
-			tag = message[1:endBracket]
-			message = strings.TrimSpace(message[endBracket+1:])
-		}
-	}
-
-	// Determine level from message content
-	msgLower := strings.ToLower(message)
-	if strings.Contains(msgLower, "error") || strings.Contains(msgLower, "failed") {
-		level = "ERROR"
-	} else if strings.Contains(msgLower, "warning") || strings.Contains(msgLower, "warn") {
-		level = "WARN"
-	} else if strings.Contains(msgLower, "success") || strings.Contains(msgLower, "match found") {
-		level = "INFO"
-	} else if strings.Contains(msgLower, "searching") || strings.Contains(msgLower, "trying") || strings.Contains(msgLower, "found") {
-		level = "DEBUG"
-	}
-
-	GetLogBuffer().Add(level, tag, message)
-}
-
-func GetLogs() string {
-	return GetLogBuffer().GetAll()
-}
-
-func GetLogsSince(index int) string {
-	entries, nextIndex := GetLogBuffer().getSince(index)
-	logsJson, _ := json.Marshal(entries)
-	result := fmt.Sprintf(`{"logs":%s,"next_index":%d}`, string(logsJson), nextIndex)
-	return result
-}
-
-func ClearLogs() {
-	GetLogBuffer().Clear()
-}
-
-func GetLogCount() int {
-	return GetLogBuffer().Count()
-}
-
-func SetLoggingEnabled(enabled bool) {
-	GetLogBuffer().SetLoggingEnabled(enabled)
-}

go_backend/lyrics.go

@@ -3,93 +3,14 @@ package gobackend
 import (
 	"encoding/json"
 	"fmt"
-	"math"
 	"net/http"
 	"net/url"
-	"os"
-	"path/filepath"
 	"regexp"
 	"strconv"
 	"strings"
-	"sync"
 	"time"
 )
 
-const (
-	lyricsCacheTTL       = 24 * time.Hour
-	durationToleranceSec = 10.0
-)
-
-type lyricsCacheEntry struct {
-	response  *LyricsResponse
-	expiresAt time.Time
-}
-
-type lyricsCache struct {
-	mu    sync.RWMutex
-	cache map[string]*lyricsCacheEntry
-}
-
-var globalLyricsCache = &lyricsCache{
-	cache: make(map[string]*lyricsCacheEntry),
-}
-
-func (c *lyricsCache) generateKey(artist, track string, durationSec float64) string {
-	normalizedArtist := strings.ToLower(strings.TrimSpace(artist))
-	normalizedTrack := strings.ToLower(strings.TrimSpace(track))
-	roundedDuration := math.Round(durationSec/10) * 10
-	return fmt.Sprintf("%s|%s|%.0f", normalizedArtist, normalizedTrack, roundedDuration)
-}
-
-func (c *lyricsCache) Get(artist, track string, durationSec float64) (*LyricsResponse, bool) {
-	c.mu.RLock()
-	defer c.mu.RUnlock()
-
-	key := c.generateKey(artist, track, durationSec)
-	entry, exists := c.cache[key]
-	if !exists {
-		return nil, false
-	}
-
-	if time.Now().After(entry.expiresAt) {
-		return nil, false
-	}
-
-	return entry.response, true
-}
-
-func (c *lyricsCache) Set(artist, track string, durationSec float64, response *LyricsResponse) {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-
-	key := c.generateKey(artist, track, durationSec)
-	c.cache[key] = &lyricsCacheEntry{
-		response:  response,
-		expiresAt: time.Now().Add(lyricsCacheTTL),
-	}
-}
-
-func (c *lyricsCache) CleanExpired() int {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-
-	now := time.Now()
-	cleaned := 0
-	for key, entry := range c.cache {
-		if now.After(entry.expiresAt) {
-			delete(c.cache, key)
-			cleaned++
-		}
-	}
-	return cleaned
-}
-
-func (c *lyricsCache) Size() int {
-	c.mu.RLock()
-	defer c.mu.RUnlock()
-	return len(c.cache)
-}
-
 type LRCLibResponse struct {
 	ID           int     `json:"id"`
 	Name         string  `json:"name"`
@@ -123,7 +44,9 @@ type LyricsClient struct {
 
 func NewLyricsClient() *LyricsClient {
 	return &LyricsClient{
-		httpClient: NewHTTPClientWithTimeout(15 * time.Second),
+		httpClient: &http.Client{
+			Timeout: 15 * time.Second,
+		},
 	}
 }
 
@@ -163,7 +86,7 @@ func (c *LyricsClient) FetchLyricsWithMetadata(artist, track string) (*LyricsRes
 	return c.parseLRCLibResponse(&lrcResp), nil
 }
 
-func (c *LyricsClient) FetchLyricsFromLRCLibSearch(query string, durationSec float64) (*LyricsResponse, error) {
+func (c *LyricsClient) FetchLyricsFromLRCLibSearch(query string) (*LyricsResponse, error) {
 	baseURL := "https://lrclib.net/api/search"
 	params := url.Values{}
 	params.Set("q", query)
@@ -195,11 +118,6 @@ func (c *LyricsClient) FetchLyricsFromLRCLibSearch(query string, durationSec flo
 		return nil, fmt.Errorf("no lyrics found")
 	}
 
-	bestMatch := c.findBestMatch(results, durationSec)
-	if bestMatch != nil {
-		return c.parseLRCLibResponse(bestMatch), nil
-	}
-
 	for _, result := range results {
 		if result.SyncedLyrics != "" {
 			return c.parseLRCLibResponse(&result), nil
@@ -209,92 +127,38 @@ func (c *LyricsClient) FetchLyricsFromLRCLibSearch(query string, durationSec flo
 	return c.parseLRCLibResponse(&results[0]), nil
 }
 
-func (c *LyricsClient) findBestMatch(results []LRCLibResponse, targetDurationSec float64) *LRCLibResponse {
-	var bestSynced *LRCLibResponse
-	var bestPlain *LRCLibResponse
-
-	for i := range results {
-		result := &results[i]
-
-		durationMatches := targetDurationSec == 0 || c.durationMatches(result.Duration, targetDurationSec)
-
-		if durationMatches {
-			if result.SyncedLyrics != "" && bestSynced == nil {
-				bestSynced = result
-			} else if result.PlainLyrics != "" && bestPlain == nil {
-				bestPlain = result
-			}
-		}
-	}
-
-	if bestSynced != nil {
-		return bestSynced
-	}
-	return bestPlain
-}
-
-func (c *LyricsClient) durationMatches(lrcDuration, targetDuration float64) bool {
-	diff := math.Abs(lrcDuration - targetDuration)
-	return diff <= durationToleranceSec
-}
-
-func (c *LyricsClient) FetchLyricsAllSources(spotifyID, trackName, artistName string, durationSec float64) (*LyricsResponse, error) {
-	primaryArtist := normalizeArtistName(artistName)
-
-	if cached, found := globalLyricsCache.Get(artistName, trackName, durationSec); found {
-		fmt.Printf("[Lyrics] Cache hit for: %s - %s\n", artistName, trackName)
-		cachedCopy := *cached
-		cachedCopy.Source = cached.Source + " (cached)"
-		return &cachedCopy, nil
-	}
-
-	var lyrics *LyricsResponse
-	var err error
-
-	isValidResult := func(l *LyricsResponse) bool {
-		return l != nil && (len(l.Lines) > 0 || l.Instrumental)
-	}
-
-	lyrics, err = c.FetchLyricsWithMetadata(primaryArtist, trackName)
-	if err == nil && isValidResult(lyrics) {
+func (c *LyricsClient) FetchLyricsAllSources(spotifyID, trackName, artistName string) (*LyricsResponse, error) {
+	// Strategy 1: Direct match with artist and track name
+	lyrics, err := c.FetchLyricsWithMetadata(artistName, trackName)
+	if err == nil && lyrics != nil && len(lyrics.Lines) > 0 {
 		lyrics.Source = "LRCLIB"
-		globalLyricsCache.Set(artistName, trackName, durationSec, lyrics)
 		return lyrics, nil
 	}
 
-	if primaryArtist != artistName {
-		lyrics, err = c.FetchLyricsWithMetadata(artistName, trackName)
-		if err == nil && isValidResult(lyrics) {
-			lyrics.Source = "LRCLIB"
-			globalLyricsCache.Set(artistName, trackName, durationSec, lyrics)
-			return lyrics, nil
-		}
-	}
-
+	// Strategy 2: Try with simplified track name
 	simplifiedTrack := simplifyTrackName(trackName)
 	if simplifiedTrack != trackName {
-		lyrics, err = c.FetchLyricsWithMetadata(primaryArtist, simplifiedTrack)
-		if err == nil && isValidResult(lyrics) {
+		lyrics, err = c.FetchLyricsWithMetadata(artistName, simplifiedTrack)
+		if err == nil && lyrics != nil && len(lyrics.Lines) > 0 {
 			lyrics.Source = "LRCLIB (simplified)"
-			globalLyricsCache.Set(artistName, trackName, durationSec, lyrics)
 			return lyrics, nil
 		}
 	}
 
-	query := primaryArtist + " " + trackName
-	lyrics, err = c.FetchLyricsFromLRCLibSearch(query, durationSec)
-	if err == nil && isValidResult(lyrics) {
+	// Strategy 3: Search with full query
+	query := artistName + " " + trackName
+	lyrics, err = c.FetchLyricsFromLRCLibSearch(query)
+	if err == nil && lyrics != nil && len(lyrics.Lines) > 0 {
 		lyrics.Source = "LRCLIB Search"
-		globalLyricsCache.Set(artistName, trackName, durationSec, lyrics)
 		return lyrics, nil
 	}
 
+	// Strategy 4: Search with simplified query
 	if simplifiedTrack != trackName {
-		query = primaryArtist + " " + simplifiedTrack
-		lyrics, err = c.FetchLyricsFromLRCLibSearch(query, durationSec)
-		if err == nil && isValidResult(lyrics) {
+		query = artistName + " " + simplifiedTrack
+		lyrics, err = c.FetchLyricsFromLRCLibSearch(query)
+		if err == nil && lyrics != nil && len(lyrics.Lines) > 0 {
 			lyrics.Source = "LRCLIB Search (simplified)"
-			globalLyricsCache.Set(artistName, trackName, durationSec, lyrics)
 			return lyrics, nil
 		}
 	}
@@ -384,23 +248,15 @@ func msToLRCTimestamp(ms int64) string {
 	return fmt.Sprintf("[%02d:%02d.%02d]", minutes, seconds, centiseconds)
 }
 
-func convertToLRCWithMetadata(lyrics *LyricsResponse, trackName, artistName string) string {
+func convertToLRC(lyrics *LyricsResponse) string {
 	if lyrics == nil || len(lyrics.Lines) == 0 {
 		return ""
 	}
 
 	var builder strings.Builder
 
-	builder.WriteString(fmt.Sprintf("[ti:%s]\n", trackName))
-	builder.WriteString(fmt.Sprintf("[ar:%s]\n", artistName))
-	builder.WriteString("[by:SpotiFLAC-Mobile]\n")
-	builder.WriteString("\n")
-
 	if lyrics.SyncType == "LINE_SYNCED" {
 		for _, line := range lyrics.Lines {
-			if line.Words == "" {
-				continue
-			}
 			timestamp := msToLRCTimestamp(line.StartTimeMs)
 			builder.WriteString(timestamp)
 			builder.WriteString(line.Words)
@@ -408,9 +264,6 @@ func convertToLRCWithMetadata(lyrics *LyricsResponse, trackName, artistName stri
 		}
 	} else {
 		for _, line := range lyrics.Lines {
-			if line.Words == "" {
-				continue
-			}
 			builder.WriteString(line.Words)
 			builder.WriteString("\n")
 		}
@@ -444,36 +297,3 @@ func simplifyTrackName(name string) string {
 
 	return strings.TrimSpace(result)
 }
-
-func normalizeArtistName(name string) string {
-	separators := []string{", ", "; ", " & ", " feat. ", " ft. ", " featuring ", " with "}
-
-	result := name
-	for _, sep := range separators {
-		if idx := strings.Index(strings.ToLower(result), strings.ToLower(sep)); idx > 0 {
-			result = result[:idx]
-			break
-		}
-	}
-
-	return strings.TrimSpace(result)
-}
-
-func SaveLRCFile(audioFilePath, lrcContent string) (string, error) {
-	if lrcContent == "" {
-		return "", fmt.Errorf("empty LRC content")
-	}
-
-	dir := filepath.Dir(audioFilePath)
-	ext := filepath.Ext(audioFilePath)
-	baseName := strings.TrimSuffix(filepath.Base(audioFilePath), ext)
-
-	lrcFilePath := filepath.Join(dir, baseName+".lrc")
-
-	if err := os.WriteFile(lrcFilePath, []byte(lrcContent), 0644); err != nil {
-		return "", fmt.Errorf("failed to write LRC file: %w", err)
-	}
-
-	GoLog("[Lyrics] Saved LRC file: %s\n", lrcFilePath)
-	return lrcFilePath, nil
-}

go_backend/metadata.go

@@ -1,19 +1,16 @@
 package gobackend
 
 import (
-	"bytes"
-	"encoding/binary"
 	"fmt"
-	"io"
 	"os"
 	"strconv"
-	"strings"
 
 	"github.com/go-flac/flacpicture"
 	"github.com/go-flac/flacvorbis"
 	"github.com/go-flac/go-flac"
 )
 
+// Metadata represents track metadata for embedding
 type Metadata struct {
 	Title       string
 	Artist      string
@@ -26,17 +23,16 @@ type Metadata struct {
 	ISRC        string
 	Description string
 	Lyrics      string
-	Genre       string
-	Label       string
-	Copyright   string
 }
 
+// EmbedMetadata embeds metadata into a FLAC file
 func EmbedMetadata(filePath string, metadata Metadata, coverPath string) error {
 	f, err := flac.ParseFile(filePath)
 	if err != nil {
 		return fmt.Errorf("failed to parse FLAC file: %w", err)
 	}
 
+	// Find or create vorbis comment block
 	var cmtIdx int = -1
 	var cmt *flacvorbis.MetaDataBlockVorbisComment
 
@@ -55,12 +51,13 @@ func EmbedMetadata(filePath string, metadata Metadata, coverPath string) error {
 		cmt = flacvorbis.New()
 	}
 
+	// Set metadata fields
 	setComment(cmt, "TITLE", metadata.Title)
 	setComment(cmt, "ARTIST", metadata.Artist)
 	setComment(cmt, "ALBUM", metadata.Album)
 	setComment(cmt, "ALBUMARTIST", metadata.AlbumArtist)
 	setComment(cmt, "DATE", metadata.Date)
-
+	
 	if metadata.TrackNumber > 0 {
 		if metadata.TotalTracks > 0 {
 			setComment(cmt, "TRACKNUMBER", fmt.Sprintf("%d/%d", metadata.TrackNumber, metadata.TotalTracks))
@@ -68,15 +65,15 @@ func EmbedMetadata(filePath string, metadata Metadata, coverPath string) error {
 			setComment(cmt, "TRACKNUMBER", strconv.Itoa(metadata.TrackNumber))
 		}
 	}
-
+	
 	if metadata.DiscNumber > 0 {
 		setComment(cmt, "DISCNUMBER", strconv.Itoa(metadata.DiscNumber))
 	}
-
+	
 	if metadata.ISRC != "" {
 		setComment(cmt, "ISRC", metadata.ISRC)
 	}
-
+	
 	if metadata.Description != "" {
 		setComment(cmt, "DESCRIPTION", metadata.Description)
 	}
@@ -86,18 +83,7 @@ func EmbedMetadata(filePath string, metadata Metadata, coverPath string) error {
 		setComment(cmt, "UNSYNCEDLYRICS", metadata.Lyrics)
 	}
 
-	if metadata.Genre != "" {
-		setComment(cmt, "GENRE", metadata.Genre)
-	}
-
-	if metadata.Label != "" {
-		setComment(cmt, "ORGANIZATION", metadata.Label)
-	}
-
-	if metadata.Copyright != "" {
-		setComment(cmt, "COPYRIGHT", metadata.Copyright)
-	}
-
+	// Update or add vorbis comment block
 	cmtBlock := cmt.Marshal()
 	if cmtIdx >= 0 {
 		f.Meta[cmtIdx] = &cmtBlock
@@ -105,18 +91,20 @@ func EmbedMetadata(filePath string, metadata Metadata, coverPath string) error {
 		f.Meta = append(f.Meta, &cmtBlock)
 	}
 
+	// Add cover art if provided
 	if coverPath != "" {
 		if fileExists(coverPath) {
 			coverData, err := os.ReadFile(coverPath)
 			if err != nil {
 				fmt.Printf("[Metadata] Warning: Failed to read cover file %s: %v\n", coverPath, err)
 			} else {
+				// Remove existing picture blocks first (like PC version)
 				for i := len(f.Meta) - 1; i >= 0; i-- {
 					if f.Meta[i].Type == flac.Picture {
 						f.Meta = append(f.Meta[:i], f.Meta[i+1:]...)
 					}
 				}
-
+				
 				picture, err := flacpicture.NewFromImageData(
 					flacpicture.PictureTypeFrontCover,
 					"Front Cover",
@@ -136,15 +124,19 @@ func EmbedMetadata(filePath string, metadata Metadata, coverPath string) error {
 		}
 	}
 
+	// Save file
 	return f.Save(filePath)
 }
 
+// EmbedMetadataWithCoverData embeds metadata into a FLAC file with cover data as bytes
+// This avoids file permission issues on Android by not requiring a temp file
 func EmbedMetadataWithCoverData(filePath string, metadata Metadata, coverData []byte) error {
 	f, err := flac.ParseFile(filePath)
 	if err != nil {
 		return fmt.Errorf("failed to parse FLAC file: %w", err)
 	}
 
+	// Find or create vorbis comment block
 	var cmtIdx int = -1
 	var cmt *flacvorbis.MetaDataBlockVorbisComment
 
@@ -163,12 +155,13 @@ func EmbedMetadataWithCoverData(filePath string, metadata Metadata, coverData []
 		cmt = flacvorbis.New()
 	}
 
+	// Set metadata fields
 	setComment(cmt, "TITLE", metadata.Title)
 	setComment(cmt, "ARTIST", metadata.Artist)
 	setComment(cmt, "ALBUM", metadata.Album)
 	setComment(cmt, "ALBUMARTIST", metadata.AlbumArtist)
 	setComment(cmt, "DATE", metadata.Date)
-
+	
 	if metadata.TrackNumber > 0 {
 		if metadata.TotalTracks > 0 {
 			setComment(cmt, "TRACKNUMBER", fmt.Sprintf("%d/%d", metadata.TrackNumber, metadata.TotalTracks))
@@ -176,15 +169,15 @@ func EmbedMetadataWithCoverData(filePath string, metadata Metadata, coverData []
 			setComment(cmt, "TRACKNUMBER", strconv.Itoa(metadata.TrackNumber))
 		}
 	}
-
+	
 	if metadata.DiscNumber > 0 {
 		setComment(cmt, "DISCNUMBER", strconv.Itoa(metadata.DiscNumber))
 	}
-
+	
 	if metadata.ISRC != "" {
 		setComment(cmt, "ISRC", metadata.ISRC)
 	}
-
+	
 	if metadata.Description != "" {
 		setComment(cmt, "DESCRIPTION", metadata.Description)
 	}
@@ -194,18 +187,7 @@ func EmbedMetadataWithCoverData(filePath string, metadata Metadata, coverData []
 		setComment(cmt, "UNSYNCEDLYRICS", metadata.Lyrics)
 	}
 
-	if metadata.Genre != "" {
-		setComment(cmt, "GENRE", metadata.Genre)
-	}
-
-	if metadata.Label != "" {
-		setComment(cmt, "ORGANIZATION", metadata.Label)
-	}
-
-	if metadata.Copyright != "" {
-		setComment(cmt, "COPYRIGHT", metadata.Copyright)
-	}
-
+	// Update or add vorbis comment block
 	cmtBlock := cmt.Marshal()
 	if cmtIdx >= 0 {
 		f.Meta[cmtIdx] = &cmtBlock
@@ -213,13 +195,15 @@ func EmbedMetadataWithCoverData(filePath string, metadata Metadata, coverData []
 		f.Meta = append(f.Meta, &cmtBlock)
 	}
 
+	// Add cover art if provided
 	if len(coverData) > 0 {
+		// Remove existing picture blocks first
 		for i := len(f.Meta) - 1; i >= 0; i-- {
 			if f.Meta[i].Type == flac.Picture {
 				f.Meta = append(f.Meta[:i], f.Meta[i+1:]...)
 			}
 		}
-
+		
 		picture, err := flacpicture.NewFromImageData(
 			flacpicture.PictureTypeFrontCover,
 			"Front Cover",
@@ -235,9 +219,11 @@ func EmbedMetadataWithCoverData(filePath string, metadata Metadata, coverData []
 		}
 	}
 
+	// Save file
 	return f.Save(filePath)
 }
 
+// ReadMetadata reads metadata from a FLAC file
 func ReadMetadata(filePath string) (*Metadata, error) {
 	f, err := flac.ParseFile(filePath)
 	if err != nil {
@@ -270,27 +256,11 @@ func ReadMetadata(filePath string) (*Metadata, error) {
 			if trackNum != "" {
 				fmt.Sscanf(trackNum, "%d", &metadata.TrackNumber)
 			}
-			if metadata.TrackNumber == 0 {
-				trackNum = getComment(cmt, "TRACK")
-				if trackNum != "" {
-					fmt.Sscanf(trackNum, "%d", &metadata.TrackNumber)
-				}
-			}
 
 			discNum := getComment(cmt, "DISCNUMBER")
 			if discNum != "" {
 				fmt.Sscanf(discNum, "%d", &metadata.DiscNumber)
 			}
-			if metadata.DiscNumber == 0 {
-				discNum = getComment(cmt, "DISC")
-				if discNum != "" {
-					fmt.Sscanf(discNum, "%d", &metadata.DiscNumber)
-				}
-			}
-
-			if metadata.Date == "" {
-				metadata.Date = getComment(cmt, "YEAR")
-			}
 
 			break
 		}
@@ -303,71 +273,32 @@ func setComment(cmt *flacvorbis.MetaDataBlockVorbisComment, key, value string) {
 	if value == "" {
 		return
 	}
-	keyUpper := strings.ToUpper(key)
+	// Remove existing
 	for i := len(cmt.Comments) - 1; i >= 0; i-- {
-		comment := cmt.Comments[i]
-		eqIdx := strings.Index(comment, "=")
-		if eqIdx > 0 {
-			existingKey := strings.ToUpper(comment[:eqIdx])
-			if existingKey == keyUpper {
-				cmt.Comments = append(cmt.Comments[:i], cmt.Comments[i+1:]...)
-			}
+		if len(cmt.Comments[i]) > len(key)+1 && cmt.Comments[i][:len(key)+1] == key+"=" {
+			cmt.Comments = append(cmt.Comments[:i], cmt.Comments[i+1:]...)
 		}
 	}
+	// Add new
 	cmt.Comments = append(cmt.Comments, key+"="+value)
 }
 
 func getComment(cmt *flacvorbis.MetaDataBlockVorbisComment, key string) string {
-	keyUpper := strings.ToUpper(key) + "="
 	for _, comment := range cmt.Comments {
-		if len(comment) > len(key) {
-			commentUpper := strings.ToUpper(comment[:len(key)+1])
-			if commentUpper == keyUpper {
-				return comment[len(key)+1:]
-			}
+		if len(comment) > len(key)+1 && comment[:len(key)+1] == key+"=" {
+			return comment[len(key)+1:]
 		}
 	}
 	return ""
 }
 
+// fileExists checks if a file exists
 func fileExists(path string) bool {
 	_, err := os.Stat(path)
 	return err == nil
 }
 
-func ExtractCoverArt(filePath string) ([]byte, error) {
-	f, err := flac.ParseFile(filePath)
-	if err != nil {
-		return nil, fmt.Errorf("failed to parse FLAC file: %w", err)
-	}
-
-	for _, meta := range f.Meta {
-		if meta.Type == flac.Picture {
-			pic, err := flacpicture.ParseFromMetaDataBlock(*meta)
-			if err != nil {
-				continue
-			}
-			if pic.PictureType == flacpicture.PictureTypeFrontCover && len(pic.ImageData) > 0 {
-				return pic.ImageData, nil
-			}
-		}
-	}
-
-	for _, meta := range f.Meta {
-		if meta.Type == flac.Picture {
-			pic, err := flacpicture.ParseFromMetaDataBlock(*meta)
-			if err != nil {
-				continue
-			}
-			if len(pic.ImageData) > 0 {
-				return pic.ImageData, nil
-			}
-		}
-	}
-
-	return nil, fmt.Errorf("no cover art found in file")
-}
-
+// EmbedLyrics embeds lyrics into a FLAC file as a separate operation
 func EmbedLyrics(filePath string, lyrics string) error {
 	f, err := flac.ParseFile(filePath)
 	if err != nil {
@@ -404,319 +335,3 @@ func EmbedLyrics(filePath string, lyrics string) error {
 
 	return f.Save(filePath)
 }
-
-func EmbedGenreLabel(filePath string, genre, label string) error {
-	if genre == "" && label == "" {
-		return nil
-	}
-
-	f, err := flac.ParseFile(filePath)
-	if err != nil {
-		return fmt.Errorf("failed to parse FLAC file: %w", err)
-	}
-
-	var cmtIdx int = -1
-	var cmt *flacvorbis.MetaDataBlockVorbisComment
-
-	for idx, meta := range f.Meta {
-		if meta.Type == flac.VorbisComment {
-			cmtIdx = idx
-			cmt, err = flacvorbis.ParseFromMetaDataBlock(*meta)
-			if err != nil {
-				return fmt.Errorf("failed to parse vorbis comment: %w", err)
-			}
-			break
-		}
-	}
-
-	if cmt == nil {
-		cmt = flacvorbis.New()
-	}
-
-	if genre != "" {
-		setComment(cmt, "GENRE", genre)
-	}
-	if label != "" {
-		setComment(cmt, "ORGANIZATION", label)
-	}
-
-	cmtBlock := cmt.Marshal()
-	if cmtIdx >= 0 {
-		f.Meta[cmtIdx] = &cmtBlock
-	} else {
-		f.Meta = append(f.Meta, &cmtBlock)
-	}
-
-	return f.Save(filePath)
-}
-
-func ExtractLyrics(filePath string) (string, error) {
-	f, err := flac.ParseFile(filePath)
-	if err != nil {
-		return "", fmt.Errorf("failed to parse FLAC file: %w", err)
-	}
-
-	for _, meta := range f.Meta {
-		if meta.Type == flac.VorbisComment {
-			cmt, err := flacvorbis.ParseFromMetaDataBlock(*meta)
-			if err != nil {
-				continue
-			}
-
-			lyrics, err := cmt.Get("LYRICS")
-			if err == nil && len(lyrics) > 0 && lyrics[0] != "" {
-				return lyrics[0], nil
-			}
-
-			lyrics, err = cmt.Get("UNSYNCEDLYRICS")
-			if err == nil && len(lyrics) > 0 && lyrics[0] != "" {
-				return lyrics[0], nil
-			}
-		}
-	}
-
-	return "", fmt.Errorf("no lyrics found in file")
-}
-
-type AudioQuality struct {
-	BitDepth     int   `json:"bit_depth"`
-	SampleRate   int   `json:"sample_rate"`
-	TotalSamples int64 `json:"total_samples"`
-}
-
-func GetAudioQuality(filePath string) (AudioQuality, error) {
-	file, err := os.Open(filePath)
-	if err != nil {
-		return AudioQuality{}, fmt.Errorf("failed to open file: %w", err)
-	}
-	defer file.Close()
-
-	marker := make([]byte, 4)
-	if _, err := file.Read(marker); err != nil {
-		return AudioQuality{}, fmt.Errorf("failed to read marker: %w", err)
-	}
-
-	if string(marker) == "fLaC" {
-		header := make([]byte, 4)
-		if _, err := file.Read(header); err != nil {
-			return AudioQuality{}, fmt.Errorf("failed to read header: %w", err)
-		}
-
-		blockType := header[0] & 0x7F
-		if blockType != 0 {
-			return AudioQuality{}, fmt.Errorf("first block is not STREAMINFO")
-		}
-
-		streamInfo := make([]byte, 34)
-		if _, err := file.Read(streamInfo); err != nil {
-			return AudioQuality{}, fmt.Errorf("failed to read STREAMINFO: %w", err)
-		}
-
-		sampleRate := (int(streamInfo[10]) << 12) | (int(streamInfo[11]) << 4) | (int(streamInfo[12]) >> 4)
-
-		bitsPerSample := ((int(streamInfo[12]) & 0x01) << 4) | (int(streamInfo[13]) >> 4) + 1
-
-		totalSamples := int64(streamInfo[13]&0x0F)<<32 |
-			int64(streamInfo[14])<<24 |
-			int64(streamInfo[15])<<16 |
-			int64(streamInfo[16])<<8 |
-			int64(streamInfo[17])
-
-		return AudioQuality{
-			BitDepth:     bitsPerSample,
-			SampleRate:   sampleRate,
-			TotalSamples: totalSamples,
-		}, nil
-	}
-
-	file.Seek(0, 0)
-	header8 := make([]byte, 8)
-	if _, err := file.Read(header8); err != nil {
-		return AudioQuality{}, fmt.Errorf("failed to read header: %w", err)
-	}
-
-	if string(header8[4:8]) == "ftyp" {
-		file.Close()
-		return GetM4AQuality(filePath)
-	}
-
-	return AudioQuality{}, fmt.Errorf("unsupported file format (not FLAC or M4A)")
-}
-
-func GetM4AQuality(filePath string) (AudioQuality, error) {
-	f, err := os.Open(filePath)
-	if err != nil {
-		return AudioQuality{}, fmt.Errorf("failed to open M4A file: %w", err)
-	}
-	defer f.Close()
-
-	info, err := f.Stat()
-	if err != nil {
-		return AudioQuality{}, fmt.Errorf("failed to stat M4A file: %w", err)
-	}
-	fileSize := info.Size()
-
-	moovHeader, moovFound, err := findAtomInRange(f, 0, fileSize, "moov", fileSize)
-	if err != nil {
-		return AudioQuality{}, fmt.Errorf("failed to find moov atom: %w", err)
-	}
-	if !moovFound {
-		return AudioQuality{}, fmt.Errorf("moov atom not found")
-	}
-
-	moovStart := moovHeader.offset
-	moovEnd := moovHeader.offset + moovHeader.size
-
-	sampleOffset, atomType, err := findAudioSampleEntry(f, moovStart, moovEnd, fileSize)
-	if err != nil {
-		return AudioQuality{}, err
-	}
-
-	buf := make([]byte, 24)
-	if _, err := f.ReadAt(buf, sampleOffset); err != nil {
-		return AudioQuality{}, fmt.Errorf("failed to read audio sample entry: %w", err)
-	}
-
-	sampleRate := int(buf[22])<<8 | int(buf[23])
-	bitDepth := 16
-	if atomType == "alac" {
-		bitDepth = 24
-	}
-
-	return AudioQuality{BitDepth: bitDepth, SampleRate: sampleRate}, nil
-}
-
-type atomHeader struct {
-	offset     int64
-	size       int64
-	headerSize int64
-	typ        string
-}
-
-func readAtomHeaderAt(f *os.File, offset, fileSize int64) (atomHeader, error) {
-	if offset+8 > fileSize {
-		return atomHeader{}, io.ErrUnexpectedEOF
-	}
-
-	headerBuf := make([]byte, 8)
-	if _, err := f.ReadAt(headerBuf, offset); err != nil {
-		return atomHeader{}, err
-	}
-
-	size32 := binary.BigEndian.Uint32(headerBuf[0:4])
-	typ := string(headerBuf[4:8])
-
-	if size32 == 1 {
-		if offset+16 > fileSize {
-			return atomHeader{}, io.ErrUnexpectedEOF
-		}
-		extBuf := make([]byte, 8)
-		if _, err := f.ReadAt(extBuf, offset+8); err != nil {
-			return atomHeader{}, err
-		}
-		size64 := binary.BigEndian.Uint64(extBuf)
-		return atomHeader{offset: offset, size: int64(size64), headerSize: 16, typ: typ}, nil
-	}
-
-	return atomHeader{offset: offset, size: int64(size32), headerSize: 8, typ: typ}, nil
-}
-
-func findAtomInRange(f *os.File, start, size int64, target string, fileSize int64) (atomHeader, bool, error) {
-	if size <= 0 {
-		return atomHeader{}, false, nil
-	}
-
-	end := start + size
-	pos := start
-
-	for pos+8 <= end {
-		header, err := readAtomHeaderAt(f, pos, fileSize)
-		if err != nil {
-			return atomHeader{}, false, err
-		}
-
-		atomSize := header.size
-		if atomSize == 0 {
-			atomSize = end - pos
-		}
-
-		if atomSize < header.headerSize {
-			return atomHeader{}, false, fmt.Errorf("invalid atom size for %s", header.typ)
-		}
-
-		header.size = atomSize
-		if header.typ == target {
-			return header, true, nil
-		}
-
-		pos += atomSize
-	}
-
-	return atomHeader{}, false, nil
-}
-
-func findAudioSampleEntry(f *os.File, start, end, fileSize int64) (int64, string, error) {
-	const chunkSize = 64 * 1024
-	patternMP4A := []byte("mp4a")
-	patternALAC := []byte("alac")
-
-	var tail []byte
-	readPos := start
-
-	for readPos < end {
-		toRead := end - readPos
-		if toRead > chunkSize {
-			toRead = chunkSize
-		}
-
-		buf := make([]byte, toRead)
-		n, err := f.ReadAt(buf, readPos)
-		if err != nil && err != io.EOF {
-			return 0, "", fmt.Errorf("failed to read M4A atom data: %w", err)
-		}
-		if n == 0 {
-			break
-		}
-
-		data := append(tail, buf[:n]...)
-		mp4aIdx := bytes.Index(data, patternMP4A)
-		alacIdx := bytes.Index(data, patternALAC)
-
-		bestIdx := -1
-		bestType := ""
-		switch {
-		case mp4aIdx >= 0 && alacIdx >= 0:
-			if mp4aIdx <= alacIdx {
-				bestIdx = mp4aIdx
-				bestType = "mp4a"
-			} else {
-				bestIdx = alacIdx
-				bestType = "alac"
-			}
-		case mp4aIdx >= 0:
-			bestIdx = mp4aIdx
-			bestType = "mp4a"
-		case alacIdx >= 0:
-			bestIdx = alacIdx
-			bestType = "alac"
-		}
-
-		if bestIdx >= 0 {
-			absolute := readPos - int64(len(tail)) + int64(bestIdx)
-			if absolute+24 > fileSize {
-				return 0, "", fmt.Errorf("audio info not found in M4A file")
-			}
-			return absolute, bestType, nil
-		}
-
-		if len(data) >= 3 {
-			tail = append([]byte{}, data[len(data)-3:]...)
-		} else {
-			tail = append([]byte{}, data...)
-		}
-
-		readPos += int64(n)
-	}
-
-	return 0, "", fmt.Errorf("audio info not found in M4A file")
-}

go_backend/mobile_deps.go

@@ -1,10 +0,0 @@
-// mobile_deps.go
-// This file ensures gomobile dependencies are not removed by go mod tidy.
-// These packages are required by gomobile bind but not directly imported in code.
-
-package gobackend
-
-import (
-	// Required for gomobile bind to work
-	_ "golang.org/x/mobile/bind"
-)

go_backend/output_fd.go

@@ -1,31 +0,0 @@
-package gobackend
-
-import (
-	"fmt"
-	"os"
-	"strings"
-)
-
-func isFDOutput(outputFD int) bool {
-	return outputFD > 0
-}
-
-func openOutputForWrite(outputPath string, outputFD int) (*os.File, error) {
-	if isFDOutput(outputFD) {
-		return os.NewFile(uintptr(outputFD), fmt.Sprintf("saf_fd_%d", outputFD)), nil
-	}
-	return os.Create(outputPath)
-}
-
-func cleanupOutputOnError(outputPath string, outputFD int) {
-	if isFDOutput(outputFD) {
-		return
-	}
-
-	path := strings.TrimSpace(outputPath)
-	if path == "" || strings.HasPrefix(path, "/proc/self/fd/") {
-		return
-	}
-
-	_ = os.Remove(path)
-}

go_backend/parallel.go

@@ -1,325 +0,0 @@
-package gobackend
-
-import (
-	"encoding/json"
-	"fmt"
-	"sync"
-	"time"
-)
-
-type TrackIDCacheEntry struct {
-	TidalTrackID  int64
-	QobuzTrackID  int64
-	AmazonURL     string
-	ExpiresAt     time.Time
-}
-
-type TrackIDCache struct {
-	cache           map[string]*TrackIDCacheEntry
-	mu              sync.RWMutex
-	ttl             time.Duration
-	lastCleanup     time.Time
-	cleanupInterval time.Duration
-}
-
-var (
-	globalTrackIDCache *TrackIDCache
-	trackIDCacheOnce   sync.Once
-)
-
-func GetTrackIDCache() *TrackIDCache {
-	trackIDCacheOnce.Do(func() {
-		globalTrackIDCache = &TrackIDCache{
-			cache:           make(map[string]*TrackIDCacheEntry),
-			ttl:             30 * time.Minute,
-			cleanupInterval: 5 * time.Minute,
-		}
-	})
-	return globalTrackIDCache
-}
-
-func (c *TrackIDCache) Get(isrc string) *TrackIDCacheEntry {
-	c.mu.RLock()
-	entry, exists := c.cache[isrc]
-	if !exists {
-		c.mu.RUnlock()
-		return nil
-	}
-	expired := time.Now().After(entry.ExpiresAt)
-	c.mu.RUnlock()
-
-	if !expired {
-		return entry
-	}
-
-	c.mu.Lock()
-	entry, exists = c.cache[isrc]
-	if exists && time.Now().After(entry.ExpiresAt) {
-		delete(c.cache, isrc)
-	}
-	c.mu.Unlock()
-	return nil
-}
-
-func (c *TrackIDCache) pruneExpiredLocked(now time.Time) {
-	for key, entry := range c.cache {
-		if now.After(entry.ExpiresAt) {
-			delete(c.cache, key)
-		}
-	}
-}
-
-func (c *TrackIDCache) SetTidal(isrc string, trackID int64) {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-
-	entry, exists := c.cache[isrc]
-	if !exists {
-		entry = &TrackIDCacheEntry{}
-		c.cache[isrc] = entry
-	}
-	entry.TidalTrackID = trackID
-	now := time.Now()
-	entry.ExpiresAt = now.Add(c.ttl)
-
-	if c.cleanupInterval > 0 && (c.lastCleanup.IsZero() || now.Sub(c.lastCleanup) >= c.cleanupInterval) {
-		c.pruneExpiredLocked(now)
-		c.lastCleanup = now
-	}
-}
-
-func (c *TrackIDCache) SetQobuz(isrc string, trackID int64) {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-
-	entry, exists := c.cache[isrc]
-	if !exists {
-		entry = &TrackIDCacheEntry{}
-		c.cache[isrc] = entry
-	}
-	entry.QobuzTrackID = trackID
-	now := time.Now()
-	entry.ExpiresAt = now.Add(c.ttl)
-
-	if c.cleanupInterval > 0 && (c.lastCleanup.IsZero() || now.Sub(c.lastCleanup) >= c.cleanupInterval) {
-		c.pruneExpiredLocked(now)
-		c.lastCleanup = now
-	}
-}
-
-func (c *TrackIDCache) SetAmazonURL(isrc string, amazonURL string) {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-
-	entry, exists := c.cache[isrc]
-	if !exists {
-		entry = &TrackIDCacheEntry{}
-		c.cache[isrc] = entry
-	}
-	entry.AmazonURL = amazonURL
-	now := time.Now()
-	entry.ExpiresAt = now.Add(c.ttl)
-
-	if c.cleanupInterval > 0 && (c.lastCleanup.IsZero() || now.Sub(c.lastCleanup) >= c.cleanupInterval) {
-		c.pruneExpiredLocked(now)
-		c.lastCleanup = now
-	}
-}
-
-func (c *TrackIDCache) Clear() {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-	c.cache = make(map[string]*TrackIDCacheEntry)
-}
-
-func (c *TrackIDCache) Size() int {
-	c.mu.RLock()
-	defer c.mu.RUnlock()
-	return len(c.cache)
-}
-
-type ParallelDownloadResult struct {
-	CoverData  []byte
-	LyricsData *LyricsResponse
-	LyricsLRC  string
-	CoverErr   error
-	LyricsErr  error
-}
-
-func FetchCoverAndLyricsParallel(
-	coverURL string,
-	maxQualityCover bool,
-	spotifyID string,
-	trackName string,
-	artistName string,
-	embedLyrics bool,
-	durationMs int64,
-) *ParallelDownloadResult {
-	result := &ParallelDownloadResult{}
-	var wg sync.WaitGroup
-	var resultMu sync.Mutex
-
-	if coverURL != "" {
-		wg.Add(1)
-		go func() {
-			defer wg.Done()
-			data, err := downloadCoverToMemory(coverURL, maxQualityCover)
-			resultMu.Lock()
-			if err != nil {
-				result.CoverErr = err
-			} else {
-				result.CoverData = data
-			}
-			resultMu.Unlock()
-		}()
-	}
-
-	if embedLyrics {
-		wg.Add(1)
-		go func() {
-			defer wg.Done()
-			client := NewLyricsClient()
-			durationSec := float64(durationMs) / 1000.0
-			lyrics, err := client.FetchLyricsAllSources(spotifyID, trackName, artistName, durationSec)
-			resultMu.Lock()
-			if err != nil {
-				result.LyricsErr = err
-			} else if lyrics != nil && len(lyrics.Lines) > 0 {
-				result.LyricsData = lyrics
-				result.LyricsLRC = convertToLRCWithMetadata(lyrics, trackName, artistName)
-			} else {
-				result.LyricsErr = fmt.Errorf("no lyrics found")
-			}
-			resultMu.Unlock()
-		}()
-	}
-
-	wg.Wait()
-	return result
-}
-
-type PreWarmCacheRequest struct {
-	ISRC       string
-	TrackName  string
-	ArtistName string
-	SpotifyID  string
-	Service    string
-}
-
-func PreWarmTrackCache(requests []PreWarmCacheRequest) {
-	if len(requests) == 0 {
-		return
-	}
-
-	cache := GetTrackIDCache()
-
-	semaphore := make(chan struct{}, 3)
-	var wg sync.WaitGroup
-
-	for _, req := range requests {
-		if req.ISRC == "" {
-			continue
-		}
-		if cached := cache.Get(req.ISRC); cached != nil {
-			continue
-		}
-
-		wg.Add(1)
-		go func(r PreWarmCacheRequest) {
-			defer wg.Done()
-			semaphore <- struct{}{}
-			defer func() { <-semaphore }()
-
-			switch r.Service {
-			case "tidal":
-				preWarmTidalCache(r.ISRC, r.TrackName, r.ArtistName)
-			case "qobuz":
-				preWarmQobuzCache(r.ISRC, r.SpotifyID)
-			case "amazon":
-				preWarmAmazonCache(r.ISRC, r.SpotifyID)
-			}
-		}(req)
-	}
-
-	wg.Wait()
-}
-
-func preWarmTidalCache(isrc, _, _ string) {
-	downloader := NewTidalDownloader()
-	track, err := downloader.SearchTrackByISRC(isrc)
-	if err == nil && track != nil {
-		GetTrackIDCache().SetTidal(isrc, track.ID)
-	}
-}
-
-// preWarmQobuzCache tries to get Qobuz Track ID in the following order:
-// 1. From SongLink (fast, no Qobuz API call needed)
-// 2. Direct ISRC search on Qobuz API (slower, may fail if ISRC not in Qobuz database)
-func preWarmQobuzCache(isrc, spotifyID string) {
-	// First, try to get QobuzID from SongLink - this is faster and more reliable
-	if spotifyID != "" {
-		client := NewSongLinkClient()
-		availability, err := client.CheckTrackAvailability(spotifyID, isrc)
-		if err == nil && availability != nil && availability.QobuzID != "" {
-			// Parse QobuzID to int64
-			var trackID int64
-			if _, parseErr := fmt.Sscanf(availability.QobuzID, "%d", &trackID); parseErr == nil && trackID > 0 {
-				GoLog("[Qobuz] Pre-warm cache: Got Qobuz ID %d from SongLink for ISRC %s\n", trackID, isrc)
-				GetTrackIDCache().SetQobuz(isrc, trackID)
-				return
-			}
-		}
-	}
-
-	// Fallback: Direct ISRC search on Qobuz API
-	downloader := NewQobuzDownloader()
-	track, err := downloader.SearchTrackByISRC(isrc)
-	if err == nil && track != nil {
-		GoLog("[Qobuz] Pre-warm cache: Got Qobuz ID %d from direct ISRC search for %s\n", track.ID, isrc)
-		GetTrackIDCache().SetQobuz(isrc, track.ID)
-	}
-}
-
-func preWarmAmazonCache(isrc, spotifyID string) {
-	client := NewSongLinkClient()
-	availability, err := client.CheckTrackAvailability(spotifyID, isrc)
-	if err == nil && availability != nil && availability.AmazonURL != "" {
-		GetTrackIDCache().SetAmazonURL(isrc, availability.AmazonURL)
-	}
-}
-
-func PreWarmCache(tracksJSON string) error {
-	var tracks []struct {
-		ISRC       string `json:"isrc"`
-		TrackName  string `json:"track_name"`
-		ArtistName string `json:"artist_name"`
-		SpotifyID  string `json:"spotify_id"`
-		Service    string `json:"service"`
-	}
-
-	if err := json.Unmarshal([]byte(tracksJSON), &tracks); err != nil {
-		return fmt.Errorf("failed to parse tracks JSON: %w", err)
-	}
-
-	requests := make([]PreWarmCacheRequest, len(tracks))
-	for i, t := range tracks {
-		requests[i] = PreWarmCacheRequest{
-			ISRC:       t.ISRC,
-			TrackName:  t.TrackName,
-			ArtistName: t.ArtistName,
-			SpotifyID:  t.SpotifyID,
-			Service:    t.Service,
-		}
-	}
-
-	go PreWarmTrackCache(requests)
-	return nil
-}
-
-func ClearTrackCache() {
-	GetTrackIDCache().Clear()
-}
-
-func GetCacheSize() int {
-	return GetTrackIDCache().Size()
-}

go_backend/progress.go

@@ -1,11 +1,10 @@
 package gobackend
 
 import (
-	"encoding/json"
 	"sync"
-	"time"
 )
 
+// DownloadProgress represents current download progress
 type DownloadProgress struct {
 	CurrentFile   string  `json:"current_file"`
 	Progress      float64 `json:"progress"`
@@ -13,169 +12,57 @@ type DownloadProgress struct {
 	BytesTotal    int64   `json:"bytes_total"`
 	BytesReceived int64   `json:"bytes_received"`
 	IsDownloading bool    `json:"is_downloading"`
-	Status        string  `json:"status"`
-}
-
-type ItemProgress struct {
-	ItemID        string  `json:"item_id"`
-	BytesTotal    int64   `json:"bytes_total"`
-	BytesReceived int64   `json:"bytes_received"`
-	Progress      float64 `json:"progress"`
-	SpeedMBps     float64 `json:"speed_mbps"`
-	IsDownloading bool    `json:"is_downloading"`
-	Status        string  `json:"status"`
-}
-
-type MultiProgress struct {
-	Items map[string]*ItemProgress `json:"items"`
 }
 
 var (
-	downloadDir   string
-	downloadDirMu sync.RWMutex
-
-	multiProgress = MultiProgress{Items: make(map[string]*ItemProgress)}
-	multiMu       sync.RWMutex
+	currentProgress DownloadProgress
+	progressMu      sync.RWMutex
+	downloadDir     string
+	downloadDirMu   sync.RWMutex
 )
 
+// getProgress returns current download progress
 func getProgress() DownloadProgress {
-	multiMu.RLock()
-	defer multiMu.RUnlock()
-
-	for _, item := range multiProgress.Items {
-		return DownloadProgress{
-			CurrentFile:   item.ItemID,
-			Progress:      item.Progress * 100,
-			BytesTotal:    item.BytesTotal,
-			BytesReceived: item.BytesReceived,
-			IsDownloading: item.IsDownloading,
-			Status:        item.Status,
-		}
-	}
-
-	return DownloadProgress{}
+	progressMu.RLock()
+	defer progressMu.RUnlock()
+	return currentProgress
 }
 
-func GetMultiProgress() string {
-	multiMu.RLock()
-	defer multiMu.RUnlock()
-
-	jsonBytes, err := json.Marshal(multiProgress)
-	if err != nil {
-		return "{\"items\":{}}"
-	}
-	return string(jsonBytes)
+// SetDownloadProgress sets the current download progress (MB downloaded)
+func SetDownloadProgress(mbDownloaded float64) {
+	progressMu.Lock()
+	defer progressMu.Unlock()
+	currentProgress.Progress = mbDownloaded
+	currentProgress.IsDownloading = true
 }
 
-func GetItemProgress(itemID string) string {
-	multiMu.RLock()
-	defer multiMu.RUnlock()
-
-	if item, ok := multiProgress.Items[itemID]; ok {
-		jsonBytes, _ := json.Marshal(item)
-		return string(jsonBytes)
-	}
-	return "{}"
+// SetDownloadSpeed sets the current download speed
+func SetDownloadSpeed(speedMBps float64) {
+	progressMu.Lock()
+	defer progressMu.Unlock()
+	currentProgress.Speed = speedMBps
 }
 
-func StartItemProgress(itemID string) {
-	multiMu.Lock()
-	defer multiMu.Unlock()
-
-	multiProgress.Items[itemID] = &ItemProgress{
-		ItemID:        itemID,
-		BytesTotal:    0,
-		BytesReceived: 0,
-		Progress:      0,
-		IsDownloading: true,
-		Status:        "downloading",
-	}
+// SetCurrentFile sets the current file being downloaded and resets progress
+func SetCurrentFile(filename string) {
+	progressMu.Lock()
+	defer progressMu.Unlock()
+	// Reset progress for new file
+	currentProgress.BytesReceived = 0
+	currentProgress.BytesTotal = 0
+	currentProgress.Progress = 0
+	currentProgress.CurrentFile = filename
+	currentProgress.IsDownloading = true
 }
 
-func SetItemBytesTotal(itemID string, total int64) {
-	multiMu.Lock()
-	defer multiMu.Unlock()
-
-	if item, ok := multiProgress.Items[itemID]; ok {
-		item.BytesTotal = total
-	}
-}
-
-func SetItemBytesReceived(itemID string, received int64) {
-	multiMu.Lock()
-	defer multiMu.Unlock()
-
-	if item, ok := multiProgress.Items[itemID]; ok {
-		item.BytesReceived = received
-		if item.BytesTotal > 0 {
-			item.Progress = float64(received) / float64(item.BytesTotal)
-		}
-	}
-}
-
-func SetItemBytesReceivedWithSpeed(itemID string, received int64, speedMBps float64) {
-	multiMu.Lock()
-	defer multiMu.Unlock()
-
-	if item, ok := multiProgress.Items[itemID]; ok {
-		item.BytesReceived = received
-		item.SpeedMBps = speedMBps
-		if item.BytesTotal > 0 {
-			item.Progress = float64(received) / float64(item.BytesTotal)
-		}
-	}
-}
-
-func CompleteItemProgress(itemID string) {
-	multiMu.Lock()
-	defer multiMu.Unlock()
-
-	if item, ok := multiProgress.Items[itemID]; ok {
-		item.Progress = 1.0
-		item.IsDownloading = false
-		item.Status = "completed"
-	}
-}
-
-func SetItemProgress(itemID string, progress float64, bytesReceived, bytesTotal int64) {
-	multiMu.Lock()
-	defer multiMu.Unlock()
-
-	if item, ok := multiProgress.Items[itemID]; ok {
-		item.Progress = progress
-		if bytesReceived > 0 {
-			item.BytesReceived = bytesReceived
-		}
-		if bytesTotal > 0 {
-			item.BytesTotal = bytesTotal
-		}
-	}
-}
-
-func SetItemFinalizing(itemID string) {
-	multiMu.Lock()
-	defer multiMu.Unlock()
-
-	if item, ok := multiProgress.Items[itemID]; ok {
-		item.Progress = 1.0
-		item.Status = "finalizing"
-	}
-}
-
-func RemoveItemProgress(itemID string) {
-	multiMu.Lock()
-	defer multiMu.Unlock()
-
-	delete(multiProgress.Items, itemID)
-}
-
-func ClearAllItemProgress() {
-	multiMu.Lock()
-	defer multiMu.Unlock()
-
-	multiProgress.Items = make(map[string]*ItemProgress)
+// ResetProgress resets the download progress
+func ResetProgress() {
+	progressMu.Lock()
+	defer progressMu.Unlock()
+	currentProgress = DownloadProgress{}
 }
 
+// setDownloadDir sets the default download directory
 func setDownloadDir(path string) error {
 	downloadDirMu.Lock()
 	defer downloadDirMu.Unlock()
@@ -183,54 +70,68 @@ func setDownloadDir(path string) error {
 	return nil
 }
 
-type ItemProgressWriter struct {
-	writer       interface{ Write([]byte) (int, error) }
-	itemID       string
-	current      int64
-	lastReported int64
-	startTime    time.Time
-	lastTime     time.Time
-	lastBytes    int64
+// getDownloadDir returns the default download directory
+func getDownloadDir() string {
+	downloadDirMu.RLock()
+	defer downloadDirMu.RUnlock()
+	return downloadDir
 }
 
-const progressUpdateThreshold = 64 * 1024
+// SetDownloading sets the download status
+func SetDownloading(status bool) {
+	progressMu.Lock()
+	defer progressMu.Unlock()
+	currentProgress.IsDownloading = status
+}
 
-func NewItemProgressWriter(w interface{ Write([]byte) (int, error) }, itemID string) *ItemProgressWriter {
-	now := time.Now()
-	return &ItemProgressWriter{
-		writer:       w,
-		itemID:       itemID,
-		current:      0,
-		lastReported: 0,
-		startTime:    now,
-		lastTime:     now,
-		lastBytes:    0,
+// SetBytesTotal sets total bytes to download
+func SetBytesTotal(total int64) {
+	progressMu.Lock()
+	defer progressMu.Unlock()
+	currentProgress.BytesTotal = total
+}
+
+// SetBytesReceived sets bytes received so far
+func SetBytesReceived(received int64) {
+	progressMu.Lock()
+	defer progressMu.Unlock()
+	currentProgress.BytesReceived = received
+	if currentProgress.BytesTotal > 0 {
+		currentProgress.Progress = float64(received) / float64(currentProgress.BytesTotal) * 100
 	}
 }
 
-func (pw *ItemProgressWriter) Write(p []byte) (int, error) {
-	if pw.itemID != "" && isDownloadCancelled(pw.itemID) {
-		return 0, ErrDownloadCancelled
+// ProgressWriter wraps io.Writer to track download progress
+type ProgressWriter struct {
+	writer  interface{ Write([]byte) (int, error) }
+	total   int64
+	current int64
+}
+
+// NewProgressWriter creates a new progress writer wrapping an io.Writer
+func NewProgressWriter(w interface{ Write([]byte) (int, error) }) *ProgressWriter {
+	// Reset bytes received when starting new download
+	SetBytesReceived(0)
+	return &ProgressWriter{
+		writer:  w,
+		current: 0,
+		total:   0,
 	}
+}
+
+// Write implements io.Writer
+func (pw *ProgressWriter) Write(p []byte) (int, error) {
 	n, err := pw.writer.Write(p)
 	if err != nil {
 		return n, err
 	}
 	pw.current += int64(n)
-
-	if pw.lastReported == 0 || pw.current-pw.lastReported >= progressUpdateThreshold {
-		now := time.Now()
-		elapsed := now.Sub(pw.lastTime).Seconds()
-		var speedMBps float64
-		if elapsed > 0 {
-			bytesInInterval := pw.current - pw.lastBytes
-			speedMBps = float64(bytesInInterval) / (1024 * 1024) / elapsed
-		}
-
-		SetItemBytesReceivedWithSpeed(pw.itemID, pw.current, speedMBps)
-		pw.lastReported = pw.current
-		pw.lastTime = now
-		pw.lastBytes = pw.current
-	}
+	pw.total += int64(n)
+	SetBytesReceived(pw.current)
 	return n, nil
 }
+
+// GetTotal returns total bytes written
+func (pw *ProgressWriter) GetTotal() int64 {
+	return pw.total
+}

go_backend/qobuz_test.go

@@ -1,47 +0,0 @@
-package gobackend
-
-import "testing"
-
-func TestExtractQobuzDownloadURLFromBody(t *testing.T) {
-	t.Run("reads nested data.url", func(t *testing.T) {
-		body := []byte(`{"success":true,"data":{"url":"https://example.test/audio.flac"}}`)
-
-		got, err := extractQobuzDownloadURLFromBody(body)
-		if err != nil {
-			t.Fatalf("expected no error, got %v", err)
-		}
-		if got != "https://example.test/audio.flac" {
-			t.Fatalf("unexpected URL: %q", got)
-		}
-	})
-
-	t.Run("reads top-level url", func(t *testing.T) {
-		body := []byte(`{"url":"https://example.test/top.flac"}`)
-
-		got, err := extractQobuzDownloadURLFromBody(body)
-		if err != nil {
-			t.Fatalf("expected no error, got %v", err)
-		}
-		if got != "https://example.test/top.flac" {
-			t.Fatalf("unexpected URL: %q", got)
-		}
-	})
-
-	t.Run("returns API error", func(t *testing.T) {
-		body := []byte(`{"error":"track not found"}`)
-
-		_, err := extractQobuzDownloadURLFromBody(body)
-		if err == nil || err.Error() != "track not found" {
-			t.Fatalf("expected track-not-found error, got %v", err)
-		}
-	})
-
-	t.Run("returns message when success false", func(t *testing.T) {
-		body := []byte(`{"success":false,"message":"blocked"}`)
-
-		_, err := extractQobuzDownloadURLFromBody(body)
-		if err == nil || err.Error() != "blocked" {
-			t.Fatalf("expected blocked error, got %v", err)
-		}
-	})
-}

go_backend/ratelimit.go

@@ -5,6 +5,7 @@ import (
 	"time"
 )
 
+// RateLimiter implements a sliding window rate limiter
 type RateLimiter struct {
 	mu          sync.Mutex
 	maxRequests int
@@ -12,6 +13,7 @@ type RateLimiter struct {
 	timestamps  []time.Time
 }
 
+// NewRateLimiter creates a new rate limiter with specified max requests per window
 func NewRateLimiter(maxRequests int, window time.Duration) *RateLimiter {
 	return &RateLimiter{
 		maxRequests: maxRequests,
@@ -20,31 +22,39 @@ func NewRateLimiter(maxRequests int, window time.Duration) *RateLimiter {
 	}
 }
 
+// WaitForSlot blocks until a request is allowed under the rate limit
+// Returns immediately if under the limit, otherwise waits until a slot is available
 func (r *RateLimiter) WaitForSlot() {
 	r.mu.Lock()
 	defer r.mu.Unlock()
 
 	now := time.Now()
 
+	// Remove timestamps outside the window
 	r.cleanOldTimestamps(now)
 
+	// If under limit, record and return immediately
 	if len(r.timestamps) < r.maxRequests {
 		r.timestamps = append(r.timestamps, now)
 		return
 	}
 
+	// Calculate wait time until oldest timestamp expires
 	oldestTimestamp := r.timestamps[0]
 	waitUntil := oldestTimestamp.Add(r.window)
 	waitDuration := waitUntil.Sub(now)
 
 	if waitDuration > 0 {
+		// Release lock while waiting
 		r.mu.Unlock()
 		time.Sleep(waitDuration)
 		r.mu.Lock()
 
+		// Clean again after waiting
 		r.cleanOldTimestamps(time.Now())
 	}
 
+	// Record this request
 	r.timestamps = append(r.timestamps, time.Now())
 }
 
@@ -66,6 +76,8 @@ func (r *RateLimiter) cleanOldTimestamps(now time.Time) {
 	}
 }
 
+// TryAcquire attempts to acquire a slot without blocking
+// Returns true if successful, false if rate limit would be exceeded
 func (r *RateLimiter) TryAcquire() bool {
 	r.mu.Lock()
 	defer r.mu.Unlock()
@@ -81,6 +93,7 @@ func (r *RateLimiter) TryAcquire() bool {
 	return false
 }
 
+// Available returns the number of requests available in the current window
 func (r *RateLimiter) Available() int {
 	r.mu.Lock()
 	defer r.mu.Unlock()
@@ -92,6 +105,7 @@ func (r *RateLimiter) Available() int {
 // Global SongLink rate limiter - 9 requests per minute (to be safe, limit is 10)
 var songLinkRateLimiter = NewRateLimiter(9, time.Minute)
 
+// GetSongLinkRateLimiter returns the global SongLink rate limiter
 func GetSongLinkRateLimiter() *RateLimiter {
 	return songLinkRateLimiter
 }

go_backend/romaji.go

@@ -5,58 +5,109 @@ import (
 	"unicode"
 )
 
+// Japanese character ranges
+const (
+	hiraganaStart = 0x3040
+	hiraganaEnd   = 0x309F
+	katakanaStart = 0x30A0
+	katakanaEnd   = 0x30FF
+	kanjiStart    = 0x4E00
+	kanjiEnd      = 0x9FFF
+)
+
+// hiraganaToRomaji maps hiragana characters to romaji
 var hiraganaToRomaji = map[rune]string{
+	// Basic vowels
 	'あ': "a", 'い': "i", 'う': "u", 'え': "e", 'お': "o",
+	// K-row
 	'か': "ka", 'き': "ki", 'く': "ku", 'け': "ke", 'こ': "ko",
+	// S-row
 	'さ': "sa", 'し': "shi", 'す': "su", 'せ': "se", 'そ': "so",
+	// T-row
 	'た': "ta", 'ち': "chi", 'つ': "tsu", 'て': "te", 'と': "to",
+	// N-row
 	'な': "na", 'に': "ni", 'ぬ': "nu", 'ね': "ne", 'の': "no",
+	// H-row
 	'は': "ha", 'ひ': "hi", 'ふ': "fu", 'へ': "he", 'ほ': "ho",
+	// M-row
 	'ま': "ma", 'み': "mi", 'む': "mu", 'め': "me", 'も': "mo",
+	// Y-row
 	'や': "ya", 'ゆ': "yu", 'よ': "yo",
+	// R-row
 	'ら': "ra", 'り': "ri", 'る': "ru", 'れ': "re", 'ろ': "ro",
-	'わ': "wa", 'を': "wo", 'ん': "n",
-	// Dakuten (voiced)
+	// W-row
+	'わ': "wa", 'を': "wo",
+	// N
+	'ん': "n",
+	// Voiced (dakuten) - G-row
 	'が': "ga", 'ぎ': "gi", 'ぐ': "gu", 'げ': "ge", 'ご': "go",
+	// Z-row
 	'ざ': "za", 'じ': "ji", 'ず': "zu", 'ぜ': "ze", 'ぞ': "zo",
+	// D-row
 	'だ': "da", 'ぢ': "ji", 'づ': "zu", 'で': "de", 'ど': "do",
+	// B-row
 	'ば': "ba", 'び': "bi", 'ぶ': "bu", 'べ': "be", 'ぼ': "bo",
-	// Handakuten (semi-voiced)
+	// P-row (handakuten)
 	'ぱ': "pa", 'ぴ': "pi", 'ぷ': "pu", 'ぺ': "pe", 'ぽ': "po",
 	// Small characters
 	'ゃ': "ya", 'ゅ': "yu", 'ょ': "yo",
-	'っ': "", // Double consonant marker
 	'ぁ': "a", 'ぃ': "i", 'ぅ': "u", 'ぇ': "e", 'ぉ': "o",
+	'っ': "", // Small tsu - handled specially
+	// Long vowel mark
+	'ー': "",
 }
 
+// katakanaToRomaji maps katakana characters to romaji
 var katakanaToRomaji = map[rune]string{
+	// Basic vowels
 	'ア': "a", 'イ': "i", 'ウ': "u", 'エ': "e", 'オ': "o",
+	// K-row
 	'カ': "ka", 'キ': "ki", 'ク': "ku", 'ケ': "ke", 'コ': "ko",
+	// S-row
 	'サ': "sa", 'シ': "shi", 'ス': "su", 'セ': "se", 'ソ': "so",
+	// T-row
 	'タ': "ta", 'チ': "chi", 'ツ': "tsu", 'テ': "te", 'ト': "to",
+	// N-row
 	'ナ': "na", 'ニ': "ni", 'ヌ': "nu", 'ネ': "ne", 'ノ': "no",
+	// H-row
 	'ハ': "ha", 'ヒ': "hi", 'フ': "fu", 'ヘ': "he", 'ホ': "ho",
+	// M-row
 	'マ': "ma", 'ミ': "mi", 'ム': "mu", 'メ': "me", 'モ': "mo",
+	// Y-row
 	'ヤ': "ya", 'ユ': "yu", 'ヨ': "yo",
+	// R-row
 	'ラ': "ra", 'リ': "ri", 'ル': "ru", 'レ': "re", 'ロ': "ro",
-	'ワ': "wa", 'ヲ': "wo", 'ン': "n",
-	// Dakuten (voiced)
+	// W-row
+	'ワ': "wa", 'ヲ': "wo",
+	// N
+	'ン': "n",
+	// Voiced (dakuten) - G-row
 	'ガ': "ga", 'ギ': "gi", 'グ': "gu", 'ゲ': "ge", 'ゴ': "go",
+	// Z-row
 	'ザ': "za", 'ジ': "ji", 'ズ': "zu", 'ゼ': "ze", 'ゾ': "zo",
+	// D-row
 	'ダ': "da", 'ヂ': "ji", 'ヅ': "zu", 'デ': "de", 'ド': "do",
+	// B-row
 	'バ': "ba", 'ビ': "bi", 'ブ': "bu", 'ベ': "be", 'ボ': "bo",
-	// Handakuten (semi-voiced)
+	// P-row (handakuten)
 	'パ': "pa", 'ピ': "pi", 'プ': "pu", 'ペ': "pe", 'ポ': "po",
 	// Small characters
 	'ャ': "ya", 'ュ': "yu", 'ョ': "yo",
-	'ッ': "", // Double consonant marker
 	'ァ': "a", 'ィ': "i", 'ゥ': "u", 'ェ': "e", 'ォ': "o",
+	'ッ': "", // Small tsu - handled specially
 	// Extended katakana
-	'ー': "", // Long vowel mark
 	'ヴ': "vu",
+	// Long vowel mark
+	'ー': "",
 }
 
-var combinationHiragana = map[string]string{
+// Extended katakana combinations (multi-character)
+var katakanaExtended = map[string]string{
+	"ファ": "fa", "フィ": "fi", "フェ": "fe", "フォ": "fo",
+}
+
+// Combination mappings for small ya/yu/yo
+var hiraganaCombo = map[string]string{
 	"きゃ": "kya", "きゅ": "kyu", "きょ": "kyo",
 	"しゃ": "sha", "しゅ": "shu", "しょ": "sho",
 	"ちゃ": "cha", "ちゅ": "chu", "ちょ": "cho",
@@ -70,7 +121,7 @@ var combinationHiragana = map[string]string{
 	"ぴゃ": "pya", "ぴゅ": "pyu", "ぴょ": "pyo",
 }
 
-var combinationKatakana = map[string]string{
+var katakanaCombo = map[string]string{
 	"キャ": "kya", "キュ": "kyu", "キョ": "kyo",
 	"シャ": "sha", "シュ": "shu", "ショ": "sho",
 	"チャ": "cha", "チュ": "chu", "チョ": "cho",
@@ -82,12 +133,15 @@ var combinationKatakana = map[string]string{
 	"ジャ": "ja", "ジュ": "ju", "ジョ": "jo",
 	"ビャ": "bya", "ビュ": "byu", "ビョ": "byo",
 	"ピャ": "pya", "ピュ": "pyu", "ピョ": "pyo",
-	// Extended combinations
-	"ティ": "ti", "ディ": "di", "トゥ": "tu", "ドゥ": "du",
+	// Extended katakana combinations
+	"ティ": "ti", "ディ": "di",
+	"トゥ": "tu", "ドゥ": "du",
 	"ファ": "fa", "フィ": "fi", "フェ": "fe", "フォ": "fo",
 	"ウィ": "wi", "ウェ": "we", "ウォ": "wo",
+	"ヴァ": "va", "ヴィ": "vi", "ヴェ": "ve", "ヴォ": "vo",
 }
 
+// ContainsJapanese checks if a string contains Japanese characters (Hiragana, Katakana, or Kanji)
 func ContainsJapanese(s string) bool {
 	for _, r := range s {
 		if isHiragana(r) || isKatakana(r) || isKanji(r) {
@@ -97,70 +151,107 @@ func ContainsJapanese(s string) bool {
 	return false
 }
 
+// ContainsKana checks if a string contains Hiragana or Katakana (convertible to romaji)
+func ContainsKana(s string) bool {
+	for _, r := range s {
+		if isHiragana(r) || isKatakana(r) {
+			return true
+		}
+	}
+	return false
+}
+
 func isHiragana(r rune) bool {
-	return r >= 0x3040 && r <= 0x309F
+	return r >= hiraganaStart && r <= hiraganaEnd
 }
 
 func isKatakana(r rune) bool {
-	return r >= 0x30A0 && r <= 0x30FF
+	return r >= katakanaStart && r <= katakanaEnd
 }
 
 func isKanji(r rune) bool {
-	return (r >= 0x4E00 && r <= 0x9FFF) || // CJK Unified Ideographs
-		(r >= 0x3400 && r <= 0x4DBF) // CJK Unified Ideographs Extension A
+	return r >= kanjiStart && r <= kanjiEnd
 }
 
-func JapaneseToRomaji(text string) string {
-	if !ContainsJapanese(text) {
-		return text
+// ToRomaji converts Japanese kana (Hiragana/Katakana) to romaji
+// Kanji characters are preserved as-is since they require dictionary lookup
+func ToRomaji(s string) string {
+	if !ContainsKana(s) {
+		return s
 	}
 
+	runes := []rune(s)
 	var result strings.Builder
-	runes := []rune(text)
-	i := 0
+	result.Grow(len(s) * 2) // Romaji is typically longer
 
+	i := 0
 	for i < len(runes) {
-		// Check for っ/ッ (double consonant)
-		if i < len(runes)-1 && (runes[i] == 'っ' || runes[i] == 'ッ') {
-			nextRomaji := ""
-			if romaji, ok := hiraganaToRomaji[runes[i+1]]; ok {
-				nextRomaji = romaji
-			} else if romaji, ok := katakanaToRomaji[runes[i+1]]; ok {
-				nextRomaji = romaji
+		r := runes[i]
+
+		// Check for two-character combinations first
+		if i+1 < len(runes) {
+			combo := string(runes[i : i+2])
+			if romaji, ok := hiraganaCombo[combo]; ok {
+				result.WriteString(romaji)
+				i += 2
+				continue
 			}
-			if len(nextRomaji) > 0 {
-				result.WriteByte(nextRomaji[0]) // Double the first consonant
+			if romaji, ok := katakanaCombo[combo]; ok {
+				result.WriteString(romaji)
+				i += 2
+				continue
+			}
+		}
+
+		// Handle small tsu (っ/ッ) - doubles the next consonant
+		if r == 'っ' || r == 'ッ' {
+			if i+1 < len(runes) {
+				nextRune := runes[i+1]
+				var nextRomaji string
+				if romaji, ok := hiraganaToRomaji[nextRune]; ok {
+					nextRomaji = romaji
+				} else if romaji, ok := katakanaToRomaji[nextRune]; ok {
+					nextRomaji = romaji
+				}
+				if len(nextRomaji) > 0 {
+					result.WriteByte(nextRomaji[0]) // Double the consonant
+				}
 			}
 			i++
 			continue
 		}
 
-		// Check for two-character combinations
-		if i < len(runes)-1 {
-			combo := string(runes[i : i+2])
-			if romaji, ok := combinationHiragana[combo]; ok {
-				result.WriteString(romaji)
-				i += 2
-				continue
-			}
-			if romaji, ok := combinationKatakana[combo]; ok {
-				result.WriteString(romaji)
-				i += 2
-				continue
+		// Handle long vowel mark (ー)
+		if r == 'ー' {
+			// Extend the previous vowel
+			resultStr := result.String()
+			if len(resultStr) > 0 {
+				lastChar := resultStr[len(resultStr)-1]
+				if lastChar == 'a' || lastChar == 'i' || lastChar == 'u' || lastChar == 'e' || lastChar == 'o' {
+					result.WriteByte(lastChar)
+				}
 			}
+			i++
+			continue
 		}
 
 		// Single character conversion
-		r := runes[i]
 		if romaji, ok := hiraganaToRomaji[r]; ok {
 			result.WriteString(romaji)
-		} else if romaji, ok := katakanaToRomaji[r]; ok {
+			i++
+			continue
+		}
+
+		if romaji, ok := katakanaToRomaji[r]; ok {
 			result.WriteString(romaji)
-		} else if isKanji(r) {
-			// Keep kanji as-is (would need dictionary for proper conversion)
-			result.WriteRune(r)
+			i++
+			continue
+		}
+
+		// Keep non-Japanese characters as-is
+		if unicode.IsSpace(r) {
+			result.WriteRune(' ')
 		} else {
-			// Keep other characters (punctuation, spaces, etc.)
 			result.WriteRune(r)
 		}
 		i++
@@ -169,43 +260,17 @@ func JapaneseToRomaji(text string) string {
 	return result.String()
 }
 
-func BuildSearchQuery(trackName, artistName string) string {
-	// Convert Japanese to romaji
-	trackRomaji := JapaneseToRomaji(trackName)
-	artistRomaji := JapaneseToRomaji(artistName)
+// GetRomajiVariants returns search variants for Japanese text
+// Returns the original string plus romaji version if applicable
+func GetRomajiVariants(s string) []string {
+	variants := []string{s}
 
-	// Clean up the query - remove special characters that might interfere with search
-	trackClean := cleanSearchQuery(trackRomaji)
-	artistClean := cleanSearchQuery(artistRomaji)
-
-	return strings.TrimSpace(artistClean + " " + trackClean)
-}
-
-func cleanSearchQuery(s string) string {
-	var result strings.Builder
-	for _, r := range s {
-		if unicode.IsLetter(r) || unicode.IsNumber(r) || unicode.IsSpace(r) {
-			result.WriteRune(r)
-		} else if r == '-' || r == '\'' {
-			result.WriteRune(r)
+	if ContainsKana(s) {
+		romaji := ToRomaji(s)
+		if romaji != s && strings.TrimSpace(romaji) != "" {
+			variants = append(variants, romaji)
 		}
 	}
-	return strings.TrimSpace(result.String())
-}
 
-func CleanToASCII(s string) string {
-	var result strings.Builder
-	for _, r := range s {
-		// Keep only ASCII letters, numbers, spaces, and basic punctuation
-		if (r >= 'a' && r <= 'z') || (r >= 'A' && r <= 'Z') ||
-			(r >= '0' && r <= '9') || r == ' ' || r == '-' || r == '\'' {
-			result.WriteRune(r)
-		} else if r == ',' || r == '.' {
-			// Convert punctuation to space
-			result.WriteRune(' ')
-		}
-	}
-	// Clean up multiple spaces
-	cleaned := strings.Join(strings.Fields(result.String()), " ")
-	return strings.TrimSpace(cleaned)
+	return variants
 }

go_backend/songlink.go

@@ -6,46 +6,38 @@ import (
 	"fmt"
 	"net/http"
 	"net/url"
-	"strings"
-	"sync"
+	"time"
 )
 
+// SongLinkClient handles song.link API interactions
 type SongLinkClient struct {
 	client *http.Client
 }
 
+// TrackAvailability represents track availability on different platforms
 type TrackAvailability struct {
 	SpotifyID string `json:"spotify_id"`
 	Tidal     bool   `json:"tidal"`
 	Amazon    bool   `json:"amazon"`
 	Qobuz     bool   `json:"qobuz"`
-	Deezer    bool   `json:"deezer"`
 	TidalURL  string `json:"tidal_url,omitempty"`
 	AmazonURL string `json:"amazon_url,omitempty"`
 	QobuzURL  string `json:"qobuz_url,omitempty"`
-	DeezerURL string `json:"deezer_url,omitempty"`
-	DeezerID  string `json:"deezer_id,omitempty"`
-	QobuzID   string `json:"qobuz_id,omitempty"`
-	TidalID   string `json:"tidal_id,omitempty"`
 }
 
-var (
-	globalSongLinkClient *SongLinkClient
-	songLinkClientOnce   sync.Once
-)
-
+// NewSongLinkClient creates a new SongLink client
 func NewSongLinkClient() *SongLinkClient {
-	songLinkClientOnce.Do(func() {
-		globalSongLinkClient = &SongLinkClient{
-			client: NewHTTPClientWithTimeout(SongLinkTimeout),
-		}
-	})
-	return globalSongLinkClient
+	return &SongLinkClient{
+		client: NewHTTPClientWithTimeout(SongLinkTimeout), // 30s timeout
+	}
 }
 
+// CheckTrackAvailability checks track availability on streaming platforms
 func (s *SongLinkClient) CheckTrackAvailability(spotifyTrackID string, isrc string) (*TrackAvailability, error) {
+	// Use global rate limiter - blocks until request is allowed
 	songLinkRateLimiter.WaitForSlot()
 
+	// Build API URL
 	spotifyBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly9vcGVuLnNwb3RpZnkuY29tL3RyYWNrLw==")
 	spotifyURL := fmt.Sprintf("%s%s", string(spotifyBase), spotifyTrackID)
 
@@ -57,6 +49,7 @@ func (s *SongLinkClient) CheckTrackAvailability(spotifyTrackID string, isrc stri
 		return nil, fmt.Errorf("failed to create request: %w", err)
 	}
 
+	// Use retry logic with User-Agent
 	retryConfig := DefaultRetryConfig()
 	resp, err := DoRequestWithRetry(s.client, req, retryConfig)
 	if err != nil {
@@ -64,232 +57,6 @@ func (s *SongLinkClient) CheckTrackAvailability(spotifyTrackID string, isrc stri
 	}
 	defer resp.Body.Close()
 
-	if resp.StatusCode == 400 {
-		return nil, fmt.Errorf("track not found on SongLink (invalid Spotify ID or track unavailable)")
-	}
-	if resp.StatusCode == 404 {
-		return nil, fmt.Errorf("track not found on any streaming platform")
-	}
-	if resp.StatusCode == 429 {
-		return nil, fmt.Errorf("SongLink rate limit exceeded")
-	}
-	if resp.StatusCode != 200 {
-		return nil, fmt.Errorf("SongLink API returned status %d", resp.StatusCode)
-	}
-
-	body, err := ReadResponseBody(resp)
-	if err != nil {
-		return nil, fmt.Errorf("failed to read response: %w", err)
-	}
-
-	var songLinkResp struct {
-		LinksByPlatform map[string]struct {
-			URL string `json:"url"`
-		} `json:"linksByPlatform"`
-	}
-
-	if err := json.Unmarshal(body, &songLinkResp); err != nil {
-		return nil, fmt.Errorf("failed to decode response: %w", err)
-	}
-
-	availability := &TrackAvailability{
-		SpotifyID: spotifyTrackID,
-	}
-
-	if tidalLink, ok := songLinkResp.LinksByPlatform["tidal"]; ok && tidalLink.URL != "" {
-		availability.Tidal = true
-		availability.TidalURL = tidalLink.URL
-		availability.TidalID = extractTidalIDFromURL(tidalLink.URL)
-	}
-
-	if amazonLink, ok := songLinkResp.LinksByPlatform["amazonMusic"]; ok && amazonLink.URL != "" {
-		availability.Amazon = true
-		availability.AmazonURL = amazonLink.URL
-	}
-
-	if deezerLink, ok := songLinkResp.LinksByPlatform["deezer"]; ok && deezerLink.URL != "" {
-		availability.Deezer = true
-		availability.DeezerURL = deezerLink.URL
-		availability.DeezerID = extractDeezerIDFromURL(deezerLink.URL)
-	}
-
-	if qobuzLink, ok := songLinkResp.LinksByPlatform["qobuz"]; ok && qobuzLink.URL != "" {
-		availability.Qobuz = true
-		availability.QobuzURL = qobuzLink.URL
-		availability.QobuzID = extractQobuzIDFromURL(qobuzLink.URL)
-	}
-
-	return availability, nil
-}
-
-func (s *SongLinkClient) GetStreamingURLs(spotifyTrackID string) (map[string]string, error) {
-	availability, err := s.CheckTrackAvailability(spotifyTrackID, "")
-	if err != nil {
-		return nil, err
-	}
-
-	urls := make(map[string]string)
-	if availability.TidalURL != "" {
-		urls["tidal"] = availability.TidalURL
-	}
-	if availability.AmazonURL != "" {
-		urls["amazon"] = availability.AmazonURL
-	}
-
-	return urls, nil
-}
-
-// extractDeezerIDFromURL extracts Deezer track/album/artist ID from URL
-func extractDeezerIDFromURL(deezerURL string) string {
-	parts := strings.Split(deezerURL, "/")
-	if len(parts) > 0 {
-		lastPart := parts[len(parts)-1]
-		if idx := strings.Index(lastPart, "?"); idx > 0 {
-			lastPart = lastPart[:idx]
-		}
-		return lastPart
-	}
-	return ""
-}
-
-// extractQobuzIDFromURL extracts Qobuz track ID from URL
-// URL formats:
-//   - https://www.qobuz.com/us-en/album/.../12345678 (album page with track highlight)
-//   - https://open.qobuz.com/track/12345678
-//   - https://www.qobuz.com/track/12345678
-//   - https://play.qobuz.com/track/12345678
-func extractQobuzIDFromURL(qobuzURL string) string {
-	if qobuzURL == "" {
-		return ""
-	}
-
-	// Try to find /track/ID pattern first
-	if strings.Contains(qobuzURL, "/track/") {
-		parts := strings.Split(qobuzURL, "/track/")
-		if len(parts) > 1 {
-			idPart := parts[1]
-			// Remove query parameters
-			if idx := strings.Index(idPart, "?"); idx > 0 {
-				idPart = idPart[:idx]
-			}
-			// Remove trailing slash or path
-			if idx := strings.Index(idPart, "/"); idx > 0 {
-				idPart = idPart[:idx]
-			}
-			idPart = strings.TrimSpace(idPart)
-			// Validate it's a number
-			if idPart != "" && isNumeric(idPart) {
-				return idPart
-			}
-		}
-	}
-
-	// Try to extract from album URL with track highlight
-	// Format: /album/albumname/trackid or ?trackId=12345678
-	if strings.Contains(qobuzURL, "trackId=") {
-		parts := strings.Split(qobuzURL, "trackId=")
-		if len(parts) > 1 {
-			idPart := parts[1]
-			if idx := strings.Index(idPart, "&"); idx > 0 {
-				idPart = idPart[:idx]
-			}
-			idPart = strings.TrimSpace(idPart)
-			if idPart != "" && isNumeric(idPart) {
-				return idPart
-			}
-		}
-	}
-
-	// Last resort: get last numeric segment from URL
-	parts := strings.Split(qobuzURL, "/")
-	for i := len(parts) - 1; i >= 0; i-- {
-		part := parts[i]
-		// Remove query parameters
-		if idx := strings.Index(part, "?"); idx > 0 {
-			part = part[:idx]
-		}
-		part = strings.TrimSpace(part)
-		if part != "" && isNumeric(part) {
-			return part
-		}
-	}
-
-	return ""
-}
-
-// extractTidalIDFromURL extracts Tidal track ID from URL
-// URL formats:
-//   - https://tidal.com/browse/track/12345678
-//   - https://listen.tidal.com/track/12345678
-func extractTidalIDFromURL(tidalURL string) string {
-	if tidalURL == "" {
-		return ""
-	}
-
-	if strings.Contains(tidalURL, "/track/") {
-		parts := strings.Split(tidalURL, "/track/")
-		if len(parts) > 1 {
-			idPart := parts[1]
-			if idx := strings.Index(idPart, "?"); idx > 0 {
-				idPart = idPart[:idx]
-			}
-			if idx := strings.Index(idPart, "/"); idx > 0 {
-				idPart = idPart[:idx]
-			}
-			idPart = strings.TrimSpace(idPart)
-			if idPart != "" && isNumeric(idPart) {
-				return idPart
-			}
-		}
-	}
-
-	return ""
-}
-
-// isNumeric is defined in library_scan.go
-
-func (s *SongLinkClient) GetDeezerIDFromSpotify(spotifyTrackID string) (string, error) {
-	availability, err := s.CheckTrackAvailability(spotifyTrackID, "")
-	if err != nil {
-		return "", err
-	}
-
-	if !availability.Deezer || availability.DeezerID == "" {
-		return "", fmt.Errorf("track not found on Deezer")
-	}
-
-	return availability.DeezerID, nil
-}
-
-// AlbumAvailability represents album availability on different platforms
-type AlbumAvailability struct {
-	SpotifyID string `json:"spotify_id"`
-	Deezer    bool   `json:"deezer"`
-	DeezerURL string `json:"deezer_url,omitempty"`
-	DeezerID  string `json:"deezer_id,omitempty"`
-}
-
-func (s *SongLinkClient) CheckAlbumAvailability(spotifyAlbumID string) (*AlbumAvailability, error) {
-	songLinkRateLimiter.WaitForSlot()
-
-	spotifyBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly9vcGVuLnNwb3RpZnkuY29tL2FsYnVtLw==")
-	spotifyURL := fmt.Sprintf("%s%s", string(spotifyBase), spotifyAlbumID)
-
-	apiBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly9hcGkuc29uZy5saW5rL3YxLWFscGhhLjEvbGlua3M/dXJsPQ==")
-	apiURL := fmt.Sprintf("%s%s", string(apiBase), url.QueryEscape(spotifyURL))
-
-	req, err := http.NewRequest("GET", apiURL, nil)
-	if err != nil {
-		return nil, fmt.Errorf("failed to create request: %w", err)
-	}
-
-	retryConfig := DefaultRetryConfig()
-	resp, err := DoRequestWithRetry(s.client, req, retryConfig)
-	if err != nil {
-		return nil, fmt.Errorf("failed to check album availability: %w", err)
-	}
-	defer resp.Body.Close()
-
 	if resp.StatusCode != 200 {
 		return nil, fmt.Errorf("API returned status %d", resp.StatusCode)
 	}
@@ -309,349 +76,78 @@ func (s *SongLinkClient) CheckAlbumAvailability(spotifyAlbumID string) (*AlbumAv
 		return nil, fmt.Errorf("failed to decode response: %w", err)
 	}
 
-	availability := &AlbumAvailability{
-		SpotifyID: spotifyAlbumID,
-	}
-
-	if deezerLink, ok := songLinkResp.LinksByPlatform["deezer"]; ok && deezerLink.URL != "" {
-		availability.Deezer = true
-		availability.DeezerURL = deezerLink.URL
-		availability.DeezerID = extractDeezerIDFromURL(deezerLink.URL)
-	}
-
-	return availability, nil
-}
-
-// GetDeezerAlbumIDFromSpotify converts a Spotify album ID to Deezer album ID using SongLink
-func (s *SongLinkClient) GetDeezerAlbumIDFromSpotify(spotifyAlbumID string) (string, error) {
-	availability, err := s.CheckAlbumAvailability(spotifyAlbumID)
-	if err != nil {
-		return "", err
-	}
-
-	if !availability.Deezer || availability.DeezerID == "" {
-		return "", fmt.Errorf("album not found on Deezer")
-	}
-
-	return availability.DeezerID, nil
-}
-
-// This is useful when we have Deezer metadata and want to find the track on other platforms
-func (s *SongLinkClient) CheckAvailabilityFromDeezer(deezerTrackID string) (*TrackAvailability, error) {
-	if deezerTrackID == "" {
-		return nil, fmt.Errorf("deezer track ID is empty")
-	}
-
-	availability, err := s.checkAvailabilityFromDeezerSongLink(deezerTrackID)
-	if err != nil {
-		LogWarn("SongLink", "SongLink failed for Deezer, trying IDHS fallback: %v", err)
-		idhsClient := NewIDHSClient()
-		availability, err = idhsClient.GetAvailabilityFromDeezer(deezerTrackID)
-		if err != nil {
-			return nil, fmt.Errorf("both SongLink and IDHS failed: %w", err)
-		}
-		LogInfo("SongLink", "IDHS fallback successful for Deezer %s", deezerTrackID)
-	}
-
-	return availability, nil
-}
-
-// checkAvailabilityFromDeezerSongLink is the original SongLink implementation for Deezer
-func (s *SongLinkClient) checkAvailabilityFromDeezerSongLink(deezerTrackID string) (*TrackAvailability, error) {
-	songLinkRateLimiter.WaitForSlot()
-
-	deezerURL := fmt.Sprintf("https://www.deezer.com/track/%s", deezerTrackID)
-
-	apiBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly9hcGkuc29uZy5saW5rL3YxLWFscGhhLjEvbGlua3M/dXJsPQ==")
-	apiURL := fmt.Sprintf("%s%s&userCountry=US", string(apiBase), url.QueryEscape(deezerURL))
-
-	req, err := http.NewRequest("GET", apiURL, nil)
-	if err != nil {
-		return nil, fmt.Errorf("failed to create request: %w", err)
-	}
-
-	retryConfig := DefaultRetryConfig()
-	resp, err := DoRequestWithRetry(s.client, req, retryConfig)
-	if err != nil {
-		return nil, fmt.Errorf("failed to check availability: %w", err)
-	}
-	defer resp.Body.Close()
-
-	if resp.StatusCode == 400 {
-		return nil, fmt.Errorf("track not found on SongLink (invalid Deezer ID)")
-	}
-	if resp.StatusCode == 404 {
-		return nil, fmt.Errorf("track not found on any streaming platform")
-	}
-	if resp.StatusCode == 429 {
-		return nil, fmt.Errorf("SongLink rate limit exceeded")
-	}
-	if resp.StatusCode != 200 {
-		return nil, fmt.Errorf("SongLink API returned status %d", resp.StatusCode)
-	}
-
-	body, err := ReadResponseBody(resp)
-	if err != nil {
-		return nil, fmt.Errorf("failed to read response: %w", err)
-	}
-
-	var songLinkResp struct {
-		LinksByPlatform map[string]struct {
-			URL string `json:"url"`
-		} `json:"linksByPlatform"`
-		EntitiesByUniqueId map[string]struct {
-			ID         string `json:"id"`
-			Type       string `json:"type"`
-			Title      string `json:"title"`
-			ArtistName string `json:"artistName"`
-		} `json:"entitiesByUniqueId"`
-	}
-
-	if err := json.Unmarshal(body, &songLinkResp); err != nil {
-		return nil, fmt.Errorf("failed to decode response: %w", err)
-	}
-
 	availability := &TrackAvailability{
-		Deezer:   true,
-		DeezerID: deezerTrackID,
-	}
-
-	if spotifyLink, ok := songLinkResp.LinksByPlatform["spotify"]; ok && spotifyLink.URL != "" {
-		availability.SpotifyID = extractSpotifyIDFromURL(spotifyLink.URL)
+		SpotifyID: spotifyTrackID,
 	}
 
+	// Check Tidal
 	if tidalLink, ok := songLinkResp.LinksByPlatform["tidal"]; ok && tidalLink.URL != "" {
 		availability.Tidal = true
 		availability.TidalURL = tidalLink.URL
-		availability.TidalID = extractTidalIDFromURL(tidalLink.URL)
 	}
 
+	// Check Amazon
 	if amazonLink, ok := songLinkResp.LinksByPlatform["amazonMusic"]; ok && amazonLink.URL != "" {
 		availability.Amazon = true
 		availability.AmazonURL = amazonLink.URL
 	}
 
-	if qobuzLink, ok := songLinkResp.LinksByPlatform["qobuz"]; ok && qobuzLink.URL != "" {
-		availability.Qobuz = true
-		availability.QobuzURL = qobuzLink.URL
-		availability.QobuzID = extractQobuzIDFromURL(qobuzLink.URL)
-	}
-
-	if deezerLink, ok := songLinkResp.LinksByPlatform["deezer"]; ok && deezerLink.URL != "" {
-		availability.DeezerURL = deezerLink.URL
+	// Check Qobuz using ISRC
+	if isrc != "" {
+		availability.Qobuz = checkQobuzAvailability(isrc)
 	}
 
 	return availability, nil
 }
 
-// platform: "spotify", "deezer", "tidal", "amazonMusic", "appleMusic", "youtube", etc.
-// entityType: "song" or "album"
-// entityID: the ID on that platform
-func (s *SongLinkClient) CheckAvailabilityByPlatform(platform, entityType, entityID string) (*TrackAvailability, error) {
-	if entityID == "" {
-		return nil, fmt.Errorf("%s ID is empty", platform)
+// GetStreamingURLs gets streaming URLs for a Spotify track
+func (s *SongLinkClient) GetStreamingURLs(spotifyTrackID string) (map[string]string, error) {
+	availability, err := s.CheckTrackAvailability(spotifyTrackID, "")
+	if err != nil {
+		return nil, err
 	}
 
-	songLinkRateLimiter.WaitForSlot()
-
-	apiURL := fmt.Sprintf("https://api.song.link/v1-alpha.1/links?platform=%s&type=%s&id=%s&userCountry=US",
-		url.QueryEscape(platform),
-		url.QueryEscape(entityType),
-		url.QueryEscape(entityID))
-
-	req, err := http.NewRequest("GET", apiURL, nil)
-	if err != nil {
-		return nil, fmt.Errorf("failed to create request: %w", err)
+	urls := make(map[string]string)
+	if availability.TidalURL != "" {
+		urls["tidal"] = availability.TidalURL
+	}
+	if availability.AmazonURL != "" {
+		urls["amazon"] = availability.AmazonURL
 	}
 
-	retryConfig := DefaultRetryConfig()
-	resp, err := DoRequestWithRetry(s.client, req, retryConfig)
+	return urls, nil
+}
+
+func checkQobuzAvailability(isrc string) bool {
+	client := NewHTTPClientWithTimeout(10 * time.Second)
+	appID := "798273057"
+
+	apiBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly93d3cucW9idXouY29tL2FwaS5qc29uLzAuMi90cmFjay9zZWFyY2g/cXVlcnk9")
+	searchURL := fmt.Sprintf("%s%s&limit=1&app_id=%s", string(apiBase), isrc, appID)
+
+	req, err := http.NewRequest("GET", searchURL, nil)
 	if err != nil {
-		return nil, fmt.Errorf("failed to check availability: %w", err)
+		return false
+	}
+
+	resp, err := DoRequestWithUserAgent(client, req)
+	if err != nil {
+		return false
 	}
 	defer resp.Body.Close()
 
-	if resp.StatusCode == 400 {
-		return nil, fmt.Errorf("track not found on SongLink (invalid %s ID)", platform)
-	}
-	if resp.StatusCode == 404 {
-		return nil, fmt.Errorf("track not found on any streaming platform")
-	}
-	if resp.StatusCode == 429 {
-		return nil, fmt.Errorf("SongLink rate limit exceeded")
-	}
 	if resp.StatusCode != 200 {
-		return nil, fmt.Errorf("SongLink API returned status %d", resp.StatusCode)
+		return false
 	}
 
-	body, err := ReadResponseBody(resp)
-	if err != nil {
-		return nil, fmt.Errorf("failed to read response: %w", err)
+	var searchResp struct {
+		Tracks struct {
+			Total int `json:"total"`
+		} `json:"tracks"`
+	}
+	if err := json.NewDecoder(resp.Body).Decode(&searchResp); err != nil {
+		return false
 	}
 
-	var songLinkResp struct {
-		LinksByPlatform map[string]struct {
-			URL string `json:"url"`
-		} `json:"linksByPlatform"`
-	}
-
-	if err := json.Unmarshal(body, &songLinkResp); err != nil {
-		return nil, fmt.Errorf("failed to decode response: %w", err)
-	}
-
-	availability := &TrackAvailability{}
-
-	if spotifyLink, ok := songLinkResp.LinksByPlatform["spotify"]; ok && spotifyLink.URL != "" {
-		availability.SpotifyID = extractSpotifyIDFromURL(spotifyLink.URL)
-	}
-
-	if tidalLink, ok := songLinkResp.LinksByPlatform["tidal"]; ok && tidalLink.URL != "" {
-		availability.Tidal = true
-		availability.TidalURL = tidalLink.URL
-		availability.TidalID = extractTidalIDFromURL(tidalLink.URL)
-	}
-
-	if amazonLink, ok := songLinkResp.LinksByPlatform["amazonMusic"]; ok && amazonLink.URL != "" {
-		availability.Amazon = true
-		availability.AmazonURL = amazonLink.URL
-	}
-
-	if qobuzLink, ok := songLinkResp.LinksByPlatform["qobuz"]; ok && qobuzLink.URL != "" {
-		availability.Qobuz = true
-		availability.QobuzURL = qobuzLink.URL
-		availability.QobuzID = extractQobuzIDFromURL(qobuzLink.URL)
-	}
-
-	if deezerLink, ok := songLinkResp.LinksByPlatform["deezer"]; ok && deezerLink.URL != "" {
-		availability.Deezer = true
-		availability.DeezerURL = deezerLink.URL
-		availability.DeezerID = extractDeezerIDFromURL(deezerLink.URL)
-	}
-
-	return availability, nil
-}
-
-// extractSpotifyIDFromURL extracts Spotify track ID from URL
-func extractSpotifyIDFromURL(spotifyURL string) string {
-	parts := strings.Split(spotifyURL, "/track/")
-	if len(parts) > 1 {
-		idPart := parts[1]
-		if idx := strings.Index(idPart, "?"); idx > 0 {
-			idPart = idPart[:idx]
-		}
-		return idPart
-	}
-	return ""
-}
-
-func (s *SongLinkClient) GetSpotifyIDFromDeezer(deezerTrackID string) (string, error) {
-	availability, err := s.CheckAvailabilityFromDeezer(deezerTrackID)
-	if err != nil {
-		return "", err
-	}
-
-	if availability.SpotifyID == "" {
-		return "", fmt.Errorf("track not found on Spotify")
-	}
-
-	return availability.SpotifyID, nil
-}
-
-// GetTidalURLFromDeezer converts a Deezer track ID to Tidal URL using SongLink
-func (s *SongLinkClient) GetTidalURLFromDeezer(deezerTrackID string) (string, error) {
-	availability, err := s.CheckAvailabilityFromDeezer(deezerTrackID)
-	if err != nil {
-		return "", err
-	}
-
-	if !availability.Tidal || availability.TidalURL == "" {
-		return "", fmt.Errorf("track not found on Tidal")
-	}
-
-	return availability.TidalURL, nil
-}
-
-func (s *SongLinkClient) GetAmazonURLFromDeezer(deezerTrackID string) (string, error) {
-	availability, err := s.CheckAvailabilityFromDeezer(deezerTrackID)
-	if err != nil {
-		return "", err
-	}
-
-	if !availability.Amazon || availability.AmazonURL == "" {
-		return "", fmt.Errorf("track not found on Amazon Music")
-	}
-
-	return availability.AmazonURL, nil
-}
-
-func (s *SongLinkClient) CheckAvailabilityFromURL(inputURL string) (*TrackAvailability, error) {
-	songLinkRateLimiter.WaitForSlot()
-
-	apiBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly9hcGkuc29uZy5saW5rL3YxLWFscGhhLjEvbGlua3M/dXJsPQ==")
-	apiURL := fmt.Sprintf("%s%s", string(apiBase), url.QueryEscape(inputURL))
-
-	req, err := http.NewRequest("GET", apiURL, nil)
-	if err != nil {
-		return nil, fmt.Errorf("failed to create request: %w", err)
-	}
-
-	retryConfig := DefaultRetryConfig()
-	resp, err := DoRequestWithRetry(s.client, req, retryConfig)
-	if err != nil {
-		return nil, fmt.Errorf("failed to check availability: %w", err)
-	}
-	defer resp.Body.Close()
-
-	if resp.StatusCode == 400 || resp.StatusCode == 404 {
-		return nil, fmt.Errorf("track not found on SongLink")
-	}
-	if resp.StatusCode == 429 {
-		return nil, fmt.Errorf("SongLink rate limit exceeded")
-	}
-	if resp.StatusCode != 200 {
-		return nil, fmt.Errorf("SongLink API returned status %d", resp.StatusCode)
-	}
-
-	body, err := ReadResponseBody(resp)
-	if err != nil {
-		return nil, fmt.Errorf("failed to read response: %w", err)
-	}
-
-	var songLinkResp struct {
-		LinksByPlatform map[string]struct {
-			URL      string `json:"url"`
-			EntityID string `json:"entityUniqueId"`
-		} `json:"linksByPlatform"`
-	}
-
-	if err := json.Unmarshal(body, &songLinkResp); err != nil {
-		return nil, fmt.Errorf("failed to decode response: %w", err)
-	}
-
-	availability := &TrackAvailability{}
-
-	if spotifyLink, ok := songLinkResp.LinksByPlatform["spotify"]; ok && spotifyLink.URL != "" {
-		availability.SpotifyID = extractSpotifyIDFromURL(spotifyLink.URL)
-	}
-	if tidalLink, ok := songLinkResp.LinksByPlatform["tidal"]; ok && tidalLink.URL != "" {
-		availability.Tidal = true
-		availability.TidalURL = tidalLink.URL
-		availability.TidalID = extractTidalIDFromURL(tidalLink.URL)
-	}
-	if amazonLink, ok := songLinkResp.LinksByPlatform["amazonMusic"]; ok && amazonLink.URL != "" {
-		availability.Amazon = true
-		availability.AmazonURL = amazonLink.URL
-	}
-	if qobuzLink, ok := songLinkResp.LinksByPlatform["qobuz"]; ok && qobuzLink.URL != "" {
-		availability.Qobuz = true
-		availability.QobuzURL = qobuzLink.URL
-		availability.QobuzID = extractQobuzIDFromURL(qobuzLink.URL)
-	}
-	if deezerLink, ok := songLinkResp.LinksByPlatform["deezer"]; ok && deezerLink.URL != "" {
-		availability.Deezer = true
-		availability.DeezerURL = deezerLink.URL
-		availability.DeezerID = extractDeezerIDFromURL(deezerLink.URL)
-	}
-
-	return availability, nil
+	return searchResp.Tracks.Total > 0
 }

go_backend/spotify.go

@@ -2,6 +2,7 @@ package gobackend
 
 import (
 	"context"
+	"encoding/base64"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -9,123 +10,59 @@ import (
 	"math/rand"
 	"net/http"
 	"net/url"
-	"os"
 	"strings"
 	"sync"
 	"time"
 )
 
 const (
-	spotifyTokenURL = "https://accounts.spotify.com/api/token"
-	playlistBaseURL = "https://api.spotify.com/v1/playlists/%s"
-	albumBaseURL    = "https://api.spotify.com/v1/albums/%s"
-	trackBaseURL    = "https://api.spotify.com/v1/tracks/%s"
-	artistBaseURL   = "https://api.spotify.com/v1/artists/%s"
-	artistAlbumsURL = "https://api.spotify.com/v1/artists/%s/albums"
-	searchBaseURL   = "https://api.spotify.com/v1/search"
-
-	artistCacheTTL = 10 * time.Minute
-	searchCacheTTL = 5 * time.Minute
-	albumCacheTTL  = 10 * time.Minute
+	spotifyTokenURL     = "https://accounts.spotify.com/api/token"
+	playlistBaseURL     = "https://api.spotify.com/v1/playlists/%s"
+	albumBaseURL        = "https://api.spotify.com/v1/albums/%s"
+	trackBaseURL        = "https://api.spotify.com/v1/tracks/%s"
+	searchBaseURL       = "https://api.spotify.com/v1/search"
 )
 
 var errInvalidSpotifyURL = errors.New("invalid or unsupported Spotify URL")
 
-type cacheEntry struct {
-	data      interface{}
-	expiresAt time.Time
-}
-
-func (e *cacheEntry) isExpired() bool {
-	return time.Now().After(e.expiresAt)
-}
-
+// SpotifyMetadataClient handles Spotify API interactions
 type SpotifyMetadataClient struct {
 	httpClient     *http.Client
 	clientID       string
 	clientSecret   string
 	cachedToken    string
 	tokenExpiresAt time.Time
-	tokenMu        sync.Mutex
 	rng            *rand.Rand
 	rngMu          sync.Mutex
 	userAgent      string
-
-	artistCache map[string]*cacheEntry
-	searchCache map[string]*cacheEntry
-	albumCache  map[string]*cacheEntry
-	cacheMu     sync.RWMutex
 }
 
-var (
-	customClientID     string
-	customClientSecret string
-	credentialsMu      sync.RWMutex
-)
-
-var ErrNoSpotifyCredentials = errors.New("Spotify credentials not configured. Please set your own Client ID and Secret in Settings, or use Deezer as metadata source (free, no credentials required)")
-
-func SetSpotifyCredentials(clientID, clientSecret string) {
-	credentialsMu.Lock()
-	defer credentialsMu.Unlock()
-	customClientID = clientID
-	customClientSecret = clientSecret
-}
-
-func HasSpotifyCredentials() bool {
-	credentialsMu.RLock()
-	defer credentialsMu.RUnlock()
-
-	if customClientID != "" && customClientSecret != "" {
-		return true
-	}
-
-	if os.Getenv("SPOTIFY_CLIENT_ID") != "" && os.Getenv("SPOTIFY_CLIENT_SECRET") != "" {
-		return true
-	}
-
-	return false
-}
-
-func getCredentials() (string, string, error) {
-	credentialsMu.RLock()
-	defer credentialsMu.RUnlock()
-
-	if customClientID != "" && customClientSecret != "" {
-		return customClientID, customClientSecret, nil
-	}
-
-	clientID := os.Getenv("SPOTIFY_CLIENT_ID")
-	clientSecret := os.Getenv("SPOTIFY_CLIENT_SECRET")
-
-	if clientID != "" && clientSecret != "" {
-		return clientID, clientSecret, nil
-	}
-
-	return "", "", ErrNoSpotifyCredentials
-}
-
-func NewSpotifyMetadataClient() (*SpotifyMetadataClient, error) {
-	clientID, clientSecret, err := getCredentials()
-	if err != nil {
-		return nil, err
-	}
-
+// NewSpotifyMetadataClient creates a new Spotify client
+func NewSpotifyMetadataClient() *SpotifyMetadataClient {
 	src := rand.NewSource(time.Now().UnixNano())
 
+	// Decode credentials from base64
+	clientID := ""
+	if decoded, err := base64.StdEncoding.DecodeString("NWY1NzNjOTYyMDQ5NGJhZTg3ODkwYzBmMDhhNjAyOTM="); err == nil {
+		clientID = string(decoded)
+	}
+
+	clientSecret := ""
+	if decoded, err := base64.StdEncoding.DecodeString("MjEyNDc2ZDliMGYzNDcyZWFhNzYyZDkwYjE5YjBiYTg="); err == nil {
+		clientSecret = string(decoded)
+	}
+
 	c := &SpotifyMetadataClient{
-		httpClient:   NewHTTPClientWithTimeout(15 * time.Second),
+		httpClient:   &http.Client{Timeout: 15 * time.Second},
 		clientID:     clientID,
 		clientSecret: clientSecret,
 		rng:          rand.New(src),
-		artistCache:  make(map[string]*cacheEntry),
-		searchCache:  make(map[string]*cacheEntry),
-		albumCache:   make(map[string]*cacheEntry),
 	}
 	c.userAgent = c.randomUserAgent()
-	return c, nil
+	return c
 }
 
+// TrackMetadata represents track information
 type TrackMetadata struct {
 	SpotifyID   string `json:"spotify_id,omitempty"`
 	Artists     string `json:"artists"`
@@ -140,9 +77,9 @@ type TrackMetadata struct {
 	DiscNumber  int    `json:"disc_number,omitempty"`
 	ExternalURL string `json:"external_urls"`
 	ISRC        string `json:"isrc"`
-	AlbumType   string `json:"album_type,omitempty"`
 }
 
+// AlbumTrackMetadata holds per-track info for album/playlist
 type AlbumTrackMetadata struct {
 	SpotifyID   string `json:"spotify_id,omitempty"`
 	Artists     string `json:"artists"`
@@ -159,26 +96,24 @@ type AlbumTrackMetadata struct {
 	ISRC        string `json:"isrc"`
 	AlbumID     string `json:"album_id,omitempty"`
 	AlbumURL    string `json:"album_url,omitempty"`
-	AlbumType   string `json:"album_type,omitempty"`
 }
 
+// AlbumInfoMetadata holds album information
 type AlbumInfoMetadata struct {
 	TotalTracks int    `json:"total_tracks"`
 	Name        string `json:"name"`
 	ReleaseDate string `json:"release_date"`
 	Artists     string `json:"artists"`
-	ArtistId    string `json:"artist_id,omitempty"`
 	Images      string `json:"images"`
-	Genre       string `json:"genre,omitempty"`
-	Label       string `json:"label,omitempty"`
-	Copyright   string `json:"copyright,omitempty"`
 }
 
+// AlbumResponsePayload is the response for album requests
 type AlbumResponsePayload struct {
 	AlbumInfo AlbumInfoMetadata    `json:"album_info"`
 	TrackList []AlbumTrackMetadata `json:"track_list"`
 }
 
+// PlaylistInfoMetadata holds playlist information
 type PlaylistInfoMetadata struct {
 	Tracks struct {
 		Total int `json:"total"`
@@ -190,76 +125,23 @@ type PlaylistInfoMetadata struct {
 	} `json:"owner"`
 }
 
+// PlaylistResponsePayload is the response for playlist requests
 type PlaylistResponsePayload struct {
 	PlaylistInfo PlaylistInfoMetadata `json:"playlist_info"`
 	TrackList    []AlbumTrackMetadata `json:"track_list"`
 }
 
-type ArtistInfoMetadata struct {
-	ID         string `json:"id"`
-	Name       string `json:"name"`
-	Images     string `json:"images"`
-	Followers  int    `json:"followers"`
-	Popularity int    `json:"popularity"`
-}
-
-type ArtistAlbumMetadata struct {
-	ID          string `json:"id"`
-	Name        string `json:"name"`
-	ReleaseDate string `json:"release_date"`
-	TotalTracks int    `json:"total_tracks"`
-	Images      string `json:"images"`
-	AlbumType   string `json:"album_type"`
-	Artists     string `json:"artists"`
-}
-
-type ArtistResponsePayload struct {
-	ArtistInfo ArtistInfoMetadata    `json:"artist_info"`
-	Albums     []ArtistAlbumMetadata `json:"albums"`
-}
-
+// TrackResponse is the response for single track requests
 type TrackResponse struct {
 	Track TrackMetadata `json:"track"`
 }
 
+// SearchResult represents search results
 type SearchResult struct {
 	Tracks []TrackMetadata `json:"tracks"`
 	Total  int             `json:"total"`
 }
 
-type SearchArtistResult struct {
-	ID         string `json:"id"`
-	Name       string `json:"name"`
-	Images     string `json:"images"`
-	Followers  int    `json:"followers"`
-	Popularity int    `json:"popularity"`
-}
-
-type SearchAlbumResult struct {
-	ID          string `json:"id"`
-	Name        string `json:"name"`
-	Artists     string `json:"artists"`
-	Images      string `json:"images"`
-	ReleaseDate string `json:"release_date"`
-	TotalTracks int    `json:"total_tracks"`
-	AlbumType   string `json:"album_type"`
-}
-
-type SearchPlaylistResult struct {
-	ID          string `json:"id"`
-	Name        string `json:"name"`
-	Owner       string `json:"owner"`
-	Images      string `json:"images"`
-	TotalTracks int    `json:"total_tracks"`
-}
-
-type SearchAllResult struct {
-	Tracks    []TrackMetadata        `json:"tracks"`
-	Artists   []SearchArtistResult   `json:"artists"`
-	Albums    []SearchAlbumResult    `json:"albums"`
-	Playlists []SearchPlaylistResult `json:"playlists"`
-}
-
 type spotifyURI struct {
 	Type string
 	ID   string
@@ -271,6 +153,7 @@ type accessTokenResponse struct {
 	TokenType   string      `json:"token_type"`
 }
 
+// Internal API response types
 type image struct {
 	URL string `json:"url"`
 }
@@ -296,7 +179,6 @@ type albumSimplified struct {
 	Images      []image     `json:"images"`
 	ExternalURL externalURL `json:"external_urls"`
 	Artists     []artist    `json:"artists"`
-	AlbumType   string      `json:"album_type"`
 }
 
 type trackFull struct {
@@ -311,6 +193,7 @@ type trackFull struct {
 	Artists     []artist        `json:"artists"`
 }
 
+// GetFilteredData fetches and formats Spotify data
 func (c *SpotifyMetadataClient) GetFilteredData(ctx context.Context, spotifyURL string, batch bool, delay time.Duration) (interface{}, error) {
 	parsed, err := parseSpotifyURI(spotifyURL)
 	if err != nil {
@@ -329,13 +212,12 @@ func (c *SpotifyMetadataClient) GetFilteredData(ctx context.Context, spotifyURL
 		return c.fetchAlbum(ctx, parsed.ID, token)
 	case "playlist":
 		return c.fetchPlaylist(ctx, parsed.ID, token)
-	case "artist":
-		return c.fetchArtist(ctx, parsed.ID, token)
 	default:
 		return nil, fmt.Errorf("unsupported Spotify type: %s", parsed.Type)
 	}
 }
 
+// SearchTracks searches for tracks on Spotify
 func (c *SpotifyMetadataClient) SearchTracks(ctx context.Context, query string, limit int) (*SearchResult, error) {
 	token, err := c.getAccessToken(ctx)
 	if err != nil {
@@ -343,14 +225,14 @@ func (c *SpotifyMetadataClient) SearchTracks(ctx context.Context, query string,
 	}
 
 	searchURL := fmt.Sprintf("%s?q=%s&type=track&limit=%d", searchBaseURL, url.QueryEscape(query), limit)
-
+	
 	var response struct {
 		Tracks struct {
 			Items []trackFull `json:"items"`
 			Total int         `json:"total"`
 		} `json:"tracks"`
 	}
-
+	
 	if err := c.getJSON(ctx, searchURL, token, &response); err != nil {
 		return nil, err
 	}
@@ -375,101 +257,12 @@ func (c *SpotifyMetadataClient) SearchTracks(ctx context.Context, query string,
 			DiscNumber:  track.DiscNumber,
 			ExternalURL: track.ExternalURL.Spotify,
 			ISRC:        track.ExternalID.ISRC,
-			AlbumType:   track.Album.AlbumType,
 		})
 	}
 
 	return result, nil
 }
 
-func (c *SpotifyMetadataClient) SearchAll(ctx context.Context, query string, trackLimit, artistLimit int) (*SearchAllResult, error) {
-	cacheKey := fmt.Sprintf("all:%s:%d:%d", query, trackLimit, artistLimit)
-
-	c.cacheMu.RLock()
-	if entry, ok := c.searchCache[cacheKey]; ok && !entry.isExpired() {
-		c.cacheMu.RUnlock()
-		return entry.data.(*SearchAllResult), nil
-	}
-	c.cacheMu.RUnlock()
-
-	token, err := c.getAccessToken(ctx)
-	if err != nil {
-		return nil, err
-	}
-
-	searchURL := fmt.Sprintf("%s?q=%s&type=track,artist&limit=%d", searchBaseURL, url.QueryEscape(query), trackLimit)
-
-	var response struct {
-		Tracks struct {
-			Items []trackFull `json:"items"`
-		} `json:"tracks"`
-		Artists struct {
-			Items []struct {
-				ID        string  `json:"id"`
-				Name      string  `json:"name"`
-				Images    []image `json:"images"`
-				Followers struct {
-					Total int `json:"total"`
-				} `json:"followers"`
-				Popularity int `json:"popularity"`
-			} `json:"items"`
-		} `json:"artists"`
-	}
-
-	if err := c.getJSON(ctx, searchURL, token, &response); err != nil {
-		return nil, err
-	}
-
-	result := &SearchAllResult{
-		Tracks:  make([]TrackMetadata, 0, len(response.Tracks.Items)),
-		Artists: make([]SearchArtistResult, 0, len(response.Artists.Items)),
-	}
-
-	for _, track := range response.Tracks.Items {
-		result.Tracks = append(result.Tracks, TrackMetadata{
-			SpotifyID:   track.ID,
-			Artists:     joinArtists(track.Artists),
-			Name:        track.Name,
-			AlbumName:   track.Album.Name,
-			AlbumArtist: joinArtists(track.Album.Artists),
-			DurationMS:  track.DurationMS,
-			Images:      firstImageURL(track.Album.Images),
-			ReleaseDate: track.Album.ReleaseDate,
-			TrackNumber: track.TrackNumber,
-			TotalTracks: track.Album.TotalTracks,
-			DiscNumber:  track.DiscNumber,
-			ExternalURL: track.ExternalURL.Spotify,
-			ISRC:        track.ExternalID.ISRC,
-			AlbumType:   track.Album.AlbumType,
-		})
-	}
-
-	artistCount := len(response.Artists.Items)
-	if artistCount > artistLimit {
-		artistCount = artistLimit
-	}
-
-	for i := 0; i < artistCount; i++ {
-		artist := response.Artists.Items[i]
-		result.Artists = append(result.Artists, SearchArtistResult{
-			ID:         artist.ID,
-			Name:       artist.Name,
-			Images:     firstImageURL(artist.Images),
-			Followers:  artist.Followers.Total,
-			Popularity: artist.Popularity,
-		})
-	}
-
-	c.cacheMu.Lock()
-	c.searchCache[cacheKey] = &cacheEntry{
-		data:      result,
-		expiresAt: time.Now().Add(searchCacheTTL),
-	}
-	c.cacheMu.Unlock()
-
-	return result, nil
-}
-
 func (c *SpotifyMetadataClient) fetchTrack(ctx context.Context, trackID, token string) (*TrackResponse, error) {
 	var data trackFull
 	if err := c.getJSON(ctx, fmt.Sprintf(trackBaseURL, trackID), token, &data); err != nil {
@@ -496,23 +289,6 @@ func (c *SpotifyMetadataClient) fetchTrack(ctx context.Context, trackID, token s
 }
 
 func (c *SpotifyMetadataClient) fetchAlbum(ctx context.Context, albumID, token string) (*AlbumResponsePayload, error) {
-	c.cacheMu.RLock()
-	if entry, ok := c.albumCache[albumID]; ok && !entry.isExpired() {
-		c.cacheMu.RUnlock()
-		return entry.data.(*AlbumResponsePayload), nil
-	}
-	c.cacheMu.RUnlock()
-
-	type trackItem struct {
-		ID          string      `json:"id"`
-		Name        string      `json:"name"`
-		DurationMS  int         `json:"duration_ms"`
-		TrackNumber int         `json:"track_number"`
-		DiscNumber  int         `json:"disc_number"`
-		ExternalURL externalURL `json:"external_urls"`
-		Artists     []artist    `json:"artists"`
-	}
-
 	var data struct {
 		Name        string   `json:"name"`
 		ReleaseDate string   `json:"release_date"`
@@ -520,8 +296,15 @@ func (c *SpotifyMetadataClient) fetchAlbum(ctx context.Context, albumID, token s
 		Images      []image  `json:"images"`
 		Artists     []artist `json:"artists"`
 		Tracks      struct {
-			Items []trackItem `json:"items"`
-			Next  string      `json:"next"`
+			Items []struct {
+				ID          string      `json:"id"`
+				Name        string      `json:"name"`
+				DurationMS  int         `json:"duration_ms"`
+				TrackNumber int         `json:"track_number"`
+				DiscNumber  int         `json:"disc_number"`
+				ExternalURL externalURL `json:"external_urls"`
+				Artists     []artist    `json:"artists"`
+			} `json:"items"`
 		} `json:"tracks"`
 	}
 
@@ -530,50 +313,19 @@ func (c *SpotifyMetadataClient) fetchAlbum(ctx context.Context, albumID, token s
 	}
 
 	albumImage := firstImageURL(data.Images)
-
-	var firstArtistId string
-	if len(data.Artists) > 0 {
-		firstArtistId = data.Artists[0].ID
-	}
-
 	info := AlbumInfoMetadata{
 		TotalTracks: data.TotalTracks,
 		Name:        data.Name,
 		ReleaseDate: data.ReleaseDate,
 		Artists:     joinArtists(data.Artists),
-		ArtistId:    firstArtistId,
 		Images:      albumImage,
 	}
 
-	allTrackItems := data.Tracks.Items
-	nextURL := data.Tracks.Next
-
-	for nextURL != "" {
-		var pageData struct {
-			Items []trackItem `json:"items"`
-			Next  string      `json:"next"`
-		}
-		if err := c.getJSON(ctx, nextURL, token, &pageData); err != nil {
-			fmt.Printf("[Spotify] Warning: failed to fetch album tracks page: %v\n", err)
-			break
-		}
-		allTrackItems = append(allTrackItems, pageData.Items...)
-		nextURL = pageData.Next
-	}
-
-	fmt.Printf("[Spotify] Album has %d tracks (total: %d)\n", len(allTrackItems), data.TotalTracks)
-
-	trackIDs := make([]string, len(allTrackItems))
-	for i, item := range allTrackItems {
-		trackIDs[i] = item.ID
-	}
-
-	isrcMap := c.fetchISRCsParallel(ctx, trackIDs, token)
-
-	tracks := make([]AlbumTrackMetadata, 0, len(allTrackItems))
-	for _, item := range allTrackItems {
-		isrc := isrcMap[item.ID]
-
+	tracks := make([]AlbumTrackMetadata, 0, len(data.Tracks.Items))
+	for _, item := range data.Tracks.Items {
+		// Fetch ISRC for each track
+		isrc := c.fetchTrackISRC(ctx, item.ID, token)
+		
 		tracks = append(tracks, AlbumTrackMetadata{
 			SpotifyID:   item.ID,
 			Artists:     joinArtists(item.Artists),
@@ -592,56 +344,10 @@ func (c *SpotifyMetadataClient) fetchAlbum(ctx context.Context, albumID, token s
 		})
 	}
 
-	result := &AlbumResponsePayload{
+	return &AlbumResponsePayload{
 		AlbumInfo: info,
 		TrackList: tracks,
-	}
-
-	c.cacheMu.Lock()
-	c.albumCache[albumID] = &cacheEntry{
-		data:      result,
-		expiresAt: time.Now().Add(albumCacheTTL),
-	}
-	c.cacheMu.Unlock()
-
-	return result, nil
-}
-
-func (c *SpotifyMetadataClient) fetchISRCsParallel(ctx context.Context, trackIDs []string, token string) map[string]string {
-	const maxParallelISRC = 10
-
-	result := make(map[string]string)
-	var resultMu sync.Mutex
-
-	if len(trackIDs) == 0 {
-		return result
-	}
-
-	sem := make(chan struct{}, maxParallelISRC)
-	var wg sync.WaitGroup
-
-	for _, trackID := range trackIDs {
-		wg.Add(1)
-		go func(id string) {
-			defer wg.Done()
-
-			select {
-			case sem <- struct{}{}:
-				defer func() { <-sem }()
-			case <-ctx.Done():
-				return
-			}
-
-			isrc := c.fetchTrackISRC(ctx, id, token)
-
-			resultMu.Lock()
-			result[id] = isrc
-			resultMu.Unlock()
-		}(trackID)
-	}
-
-	wg.Wait()
-	return result
+	}, nil
 }
 
 func (c *SpotifyMetadataClient) fetchPlaylist(ctx context.Context, playlistID, token string) (*PlaylistResponsePayload, error) {
@@ -655,8 +361,7 @@ func (c *SpotifyMetadataClient) fetchPlaylist(ctx context.Context, playlistID, t
 			Items []struct {
 				Track *trackFull `json:"track"`
 			} `json:"items"`
-			Total int    `json:"total"`
-			Next  string `json:"next"`
+			Total int `json:"total"`
 		} `json:"tracks"`
 	}
 
@@ -670,8 +375,7 @@ func (c *SpotifyMetadataClient) fetchPlaylist(ctx context.Context, playlistID, t
 	info.Owner.Name = data.Name
 	info.Owner.Images = firstImageURL(data.Images)
 
-	tracks := make([]AlbumTrackMetadata, 0, data.Tracks.Total)
-
+	tracks := make([]AlbumTrackMetadata, 0, len(data.Tracks.Items))
 	for _, item := range data.Tracks.Items {
 		if item.Track == nil {
 			continue
@@ -695,149 +399,12 @@ func (c *SpotifyMetadataClient) fetchPlaylist(ctx context.Context, playlistID, t
 		})
 	}
 
-	nextURL := data.Tracks.Next
-
-	for nextURL != "" {
-		var pageData struct {
-			Items []struct {
-				Track *trackFull `json:"track"`
-			} `json:"items"`
-			Next string `json:"next"`
-		}
-
-		if err := c.getJSON(ctx, nextURL, token, &pageData); err != nil {
-			fmt.Printf("[Spotify] Warning: failed to fetch page, returning %d tracks: %v\n", len(tracks), err)
-			break
-		}
-
-		for _, item := range pageData.Items {
-			if item.Track == nil {
-				continue
-			}
-			tracks = append(tracks, AlbumTrackMetadata{
-				SpotifyID:   item.Track.ID,
-				Artists:     joinArtists(item.Track.Artists),
-				Name:        item.Track.Name,
-				AlbumName:   item.Track.Album.Name,
-				AlbumArtist: joinArtists(item.Track.Album.Artists),
-				DurationMS:  item.Track.DurationMS,
-				Images:      firstImageURL(item.Track.Album.Images),
-				ReleaseDate: item.Track.Album.ReleaseDate,
-				TrackNumber: item.Track.TrackNumber,
-				TotalTracks: item.Track.Album.TotalTracks,
-				DiscNumber:  item.Track.DiscNumber,
-				ExternalURL: item.Track.ExternalURL.Spotify,
-				ISRC:        item.Track.ExternalID.ISRC,
-				AlbumID:     item.Track.Album.ID,
-				AlbumURL:    item.Track.Album.ExternalURL.Spotify,
-			})
-		}
-
-		nextURL = pageData.Next
-	}
-
-	fmt.Printf("[Spotify] Fetched %d tracks from playlist (total: %d)\n", len(tracks), data.Tracks.Total)
-
 	return &PlaylistResponsePayload{
 		PlaylistInfo: info,
 		TrackList:    tracks,
 	}, nil
 }
 
-func (c *SpotifyMetadataClient) fetchArtist(ctx context.Context, artistID, token string) (*ArtistResponsePayload, error) {
-	c.cacheMu.RLock()
-	if entry, ok := c.artistCache[artistID]; ok && !entry.isExpired() {
-		c.cacheMu.RUnlock()
-		return entry.data.(*ArtistResponsePayload), nil
-	}
-	c.cacheMu.RUnlock()
-
-	var artistData struct {
-		ID        string  `json:"id"`
-		Name      string  `json:"name"`
-		Images    []image `json:"images"`
-		Followers struct {
-			Total int `json:"total"`
-		} `json:"followers"`
-		Popularity int `json:"popularity"`
-	}
-
-	if err := c.getJSON(ctx, fmt.Sprintf(artistBaseURL, artistID), token, &artistData); err != nil {
-		return nil, err
-	}
-
-	artistInfo := ArtistInfoMetadata{
-		ID:         artistData.ID,
-		Name:       artistData.Name,
-		Images:     firstImageURL(artistData.Images),
-		Followers:  artistData.Followers.Total,
-		Popularity: artistData.Popularity,
-	}
-
-	albums := make([]ArtistAlbumMetadata, 0)
-	offset := 0
-	limit := 50
-
-	for {
-		albumsURL := fmt.Sprintf("%s?include_groups=album,single,compilation&limit=%d&offset=%d",
-			fmt.Sprintf(artistAlbumsURL, artistID), limit, offset)
-
-		var albumsData struct {
-			Items []struct {
-				ID          string      `json:"id"`
-				Name        string      `json:"name"`
-				ReleaseDate string      `json:"release_date"`
-				TotalTracks int         `json:"total_tracks"`
-				Images      []image     `json:"images"`
-				AlbumType   string      `json:"album_type"`
-				Artists     []artist    `json:"artists"`
-				ExternalURL externalURL `json:"external_urls"`
-			} `json:"items"`
-			Next  string `json:"next"`
-			Total int    `json:"total"`
-		}
-
-		if err := c.getJSON(ctx, albumsURL, token, &albumsData); err != nil {
-			return nil, err
-		}
-
-		for _, album := range albumsData.Items {
-			albums = append(albums, ArtistAlbumMetadata{
-				ID:          album.ID,
-				Name:        album.Name,
-				ReleaseDate: album.ReleaseDate,
-				TotalTracks: album.TotalTracks,
-				Images:      firstImageURL(album.Images),
-				AlbumType:   album.AlbumType,
-				Artists:     joinArtists(album.Artists),
-			})
-		}
-
-		if albumsData.Next == "" || len(albumsData.Items) < limit {
-			break
-		}
-		offset += limit
-
-		if offset > 500 {
-			break
-		}
-	}
-
-	result := &ArtistResponsePayload{
-		ArtistInfo: artistInfo,
-		Albums:     albums,
-	}
-
-	c.cacheMu.Lock()
-	c.artistCache[artistID] = &cacheEntry{
-		data:      result,
-		expiresAt: time.Now().Add(artistCacheTTL),
-	}
-	c.cacheMu.Unlock()
-
-	return result, nil
-}
-
 func (c *SpotifyMetadataClient) fetchTrackISRC(ctx context.Context, trackID, token string) string {
 	var data struct {
 		ExternalID externalID `json:"external_ids"`
@@ -900,13 +467,6 @@ func (c *SpotifyMetadataClient) getJSON(ctx context.Context, endpoint, token str
 
 	req.Header.Set("User-Agent", c.userAgent)
 	req.Header.Set("Accept", "application/json")
-	req.Header.Set("Accept-Language", "en-US,en;q=0.9")
-	req.Header.Set("sec-ch-ua-platform", "\"Windows\"")
-	req.Header.Set("sec-fetch-dest", "empty")
-	req.Header.Set("sec-fetch-mode", "cors")
-	req.Header.Set("sec-fetch-site", "same-origin")
-	req.Header.Set("Referer", "https://open.spotify.com/")
-	req.Header.Set("Origin", "https://open.spotify.com")
 	if token != "" {
 		req.Header.Set("Authorization", "Bearer "+token)
 	}
@@ -933,22 +493,13 @@ func (c *SpotifyMetadataClient) randomUserAgent() string {
 	c.rngMu.Lock()
 	defer c.rngMu.Unlock()
 
-	macMajor := c.rng.Intn(4) + 11
-	macMinor := c.rng.Intn(5) + 4
-	webkitMajor := c.rng.Intn(7) + 530
-	webkitMinor := c.rng.Intn(7) + 30
-	chromeMajor := c.rng.Intn(25) + 80
-	chromeBuild := c.rng.Intn(1500) + 3000
-	chromePatch := c.rng.Intn(65) + 60
-	safariMajor := c.rng.Intn(7) + 530
-	safariMinor := c.rng.Intn(6) + 30
+	chromeMajor := 80 + c.rng.Intn(25)
+	chromeBuild := 3000 + c.rng.Intn(1500)
+	chromePatch := 60 + c.rng.Intn(65)
 
 	return fmt.Sprintf(
-		"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_%d_%d) AppleWebKit/%d.%d (KHTML, like Gecko) Chrome/%d.0.%d.%d Safari/%d.%d",
-		macMajor, macMinor,
-		webkitMajor, webkitMinor,
+		"Mozilla/5.0 (Linux; Android 12) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/%d.0.%d.%d Mobile Safari/537.36",
 		chromeMajor, chromeBuild, chromePatch,
-		safariMajor, safariMinor,
 	)
 }
 
@@ -958,6 +509,7 @@ func parseSpotifyURI(input string) (spotifyURI, error) {
 		return spotifyURI{}, errInvalidSpotifyURL
 	}
 
+	// Handle spotify: URI format
 	if strings.HasPrefix(trimmed, "spotify:") {
 		parts := strings.Split(trimmed, ":")
 		if len(parts) == 3 {
@@ -968,11 +520,13 @@ func parseSpotifyURI(input string) (spotifyURI, error) {
 		}
 	}
 
+	// Handle URL format
 	parsed, err := url.Parse(trimmed)
 	if err != nil {
 		return spotifyURI{}, err
 	}
 
+	// Handle embed.spotify.com URLs
 	if parsed.Host == "embed.spotify.com" {
 		if parsed.RawQuery == "" {
 			return spotifyURI{}, errInvalidSpotifyURL
@@ -985,6 +539,7 @@ func parseSpotifyURI(input string) (spotifyURI, error) {
 		return parseSpotifyURI(embedded)
 	}
 
+	// Handle plain ID (no scheme/host) - defaults to playlist
 	if parsed.Scheme == "" && parsed.Host == "" {
 		id := strings.Trim(strings.TrimSpace(parsed.Path), "/")
 		if id == "" {
@@ -1010,6 +565,7 @@ func parseSpotifyURI(input string) (spotifyURI, error) {
 		return spotifyURI{}, errInvalidSpotifyURL
 	}
 
+	// Skip intl- prefix if present
 	if strings.HasPrefix(parts[0], "intl-") {
 		parts = parts[1:]
 	}
@@ -1017,6 +573,7 @@ func parseSpotifyURI(input string) (spotifyURI, error) {
 		return spotifyURI{}, errInvalidSpotifyURL
 	}
 
+	// Handle standard URLs: /album/{id}, /track/{id}, /playlist/{id}, /artist/{id}
 	if len(parts) == 2 {
 		switch parts[0] {
 		case "album", "track", "playlist", "artist":
@@ -1024,6 +581,7 @@ func parseSpotifyURI(input string) (spotifyURI, error) {
 		}
 	}
 
+	// Handle nested playlist URLs: /user/{user}/playlist/{id}
 	if len(parts) == 4 && parts[2] == "playlist" {
 		return spotifyURI{Type: "playlist", ID: parts[3]}, nil
 	}

ios/Runner.xcodeproj/project.pbxproj

@@ -427,7 +427,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
-				ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = AppIcon;
+				ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = YES;
 				CLANG_ANALYZER_NONNULL = YES;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -484,7 +484,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
-				ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = AppIcon;
+				ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = YES;
 				CLANG_ANALYZER_NONNULL = YES;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";

ios/Runner/AppDelegate.swift

@@ -66,15 +66,6 @@ import Gobackend  // Import Go framework
             if let error = error { throw error }
             return response
             
-        case "searchSpotifyAll":
-            let args = call.arguments as! [String: Any]
-            let query = args["query"] as! String
-            let trackLimit = args["track_limit"] as? Int ?? 15
-            let artistLimit = args["artist_limit"] as? Int ?? 3
-            let response = GobackendSearchSpotifyAll(query, Int(trackLimit), Int(artistLimit), &error)
-            if let error = error { throw error }
-            return response
-            
         case "checkAvailability":
             let args = call.arguments as! [String: Any]
             let spotifyId = args["spotify_id"] as! String
@@ -99,34 +90,6 @@ import Gobackend  // Import Go framework
             let response = GobackendGetDownloadProgress()
             return response
             
-        case "getAllDownloadProgress":
-            let response = GobackendGetAllDownloadProgress()
-            return response
-            
-        case "initItemProgress":
-            let args = call.arguments as! [String: Any]
-            let itemId = args["item_id"] as! String
-            GobackendInitItemProgress(itemId)
-            return nil
-            
-        case "finishItemProgress":
-            let args = call.arguments as! [String: Any]
-            let itemId = args["item_id"] as! String
-            GobackendFinishItemProgress(itemId)
-            return nil
-            
-        case "clearItemProgress":
-            let args = call.arguments as! [String: Any]
-            let itemId = args["item_id"] as! String
-            GobackendClearItemProgress(itemId)
-            return nil
-
-        case "cancelDownload":
-            let args = call.arguments as! [String: Any]
-            let itemId = args["item_id"] as! String
-            GobackendCancelDownload(itemId)
-            return nil
-            
         case "setDownloadDirectory":
             let args = call.arguments as! [String: Any]
             let path = args["path"] as! String
@@ -142,27 +105,6 @@ import Gobackend  // Import Go framework
             if let error = error { throw error }
             return response
             
-        case "checkDuplicatesBatch":
-            let args = call.arguments as! [String: Any]
-            let outputDir = args["output_dir"] as! String
-            let tracksJson = args["tracks"] as? String ?? "[]"
-            let response = GobackendCheckDuplicatesBatch(outputDir, tracksJson, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "preBuildDuplicateIndex":
-            let args = call.arguments as! [String: Any]
-            let outputDir = args["output_dir"] as! String
-            GobackendPreBuildDuplicateIndex(outputDir, &error)
-            if let error = error { throw error }
-            return nil
-            
-        case "invalidateDuplicateIndex":
-            let args = call.arguments as! [String: Any]
-            let outputDir = args["output_dir"] as! String
-            GobackendInvalidateDuplicateIndex(outputDir)
-            return nil
-            
         case "buildFilename":
             let args = call.arguments as! [String: Any]
             let template = args["template"] as! String
@@ -182,8 +124,7 @@ import Gobackend  // Import Go framework
             let spotifyId = args["spotify_id"] as! String
             let trackName = args["track_name"] as! String
             let artistName = args["artist_name"] as! String
-            let durationMs = args["duration_ms"] as? Int64 ?? 0
-            let response = GobackendFetchLyrics(spotifyId, trackName, artistName, durationMs, &error)
+            let response = GobackendFetchLyrics(spotifyId, trackName, artistName, &error)
             if let error = error { throw error }
             return response
             
@@ -192,9 +133,7 @@ import Gobackend  // Import Go framework
             let spotifyId = args["spotify_id"] as! String
             let trackName = args["track_name"] as! String
             let artistName = args["artist_name"] as! String
-            let filePath = args["file_path"] as? String ?? ""
-            let durationMs = args["duration_ms"] as? Int64 ?? 0
-            let response = GobackendGetLyricsLRC(spotifyId, trackName, artistName, filePath, durationMs, &error)
+            let response = GobackendGetLyricsLRC(spotifyId, trackName, artistName, &error)
             if let error = error { throw error }
             return response
             
@@ -206,546 +145,6 @@ import Gobackend  // Import Go framework
             if let error = error { throw error }
             return response
             
-        case "cleanupConnections":
-            GobackendCleanupConnections()
-            return nil
-            
-        case "readFileMetadata":
-            let args = call.arguments as! [String: Any]
-            let filePath = args["file_path"] as! String
-            let response = GobackendReadFileMetadata(filePath, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "searchDeezerAll":
-            let args = call.arguments as! [String: Any]
-            let query = args["query"] as! String
-            let trackLimit = args["track_limit"] as? Int ?? 15
-            let artistLimit = args["artist_limit"] as? Int ?? 3
-            let filter = args["filter"] as? String ?? ""
-            let response = GobackendSearchDeezerAll(query, Int(trackLimit), Int(artistLimit), filter, &error)
-            if let error = error { throw error }
-            return response
-
-        case "getDeezerMetadata":
-            let args = call.arguments as! [String: Any]
-            let resourceType = args["resource_type"] as! String
-            let resourceId = args["resource_id"] as! String
-            let response = GobackendGetDeezerMetadata(resourceType, resourceId, &error)
-            if let error = error { throw error }
-            return response
-
-        case "parseDeezerUrl":
-            let args = call.arguments as! [String: Any]
-            let url = args["url"] as! String
-            let response = GobackendParseDeezerURLExport(url, &error)
-            if let error = error { throw error }
-            return response
-
-        case "parseTidalUrl":
-            let args = call.arguments as! [String: Any]
-            let url = args["url"] as! String
-            let response = GobackendParseTidalURLExport(url, &error)
-            if let error = error { throw error }
-            return response
-
-        case "convertTidalToSpotifyDeezer":
-            let args = call.arguments as! [String: Any]
-            let url = args["url"] as! String
-            let response = GobackendConvertTidalToSpotifyDeezer(url, &error)
-            if let error = error { throw error }
-            return response
-
-        case "searchDeezerByISRC":
-            let args = call.arguments as! [String: Any]
-            let isrc = args["isrc"] as! String
-            let response = GobackendSearchDeezerByISRC(isrc, &error)
-            if let error = error { throw error }
-            return response
-
-        case "getDeezerExtendedMetadata":
-            let args = call.arguments as! [String: Any]
-            let trackId = args["track_id"] as! String
-            let response = GobackendGetDeezerExtendedMetadata(trackId, &error)
-            if let error = error { throw error }
-            return response
-
-        case "convertSpotifyToDeezer":
-            let args = call.arguments as! [String: Any]
-            let resourceType = args["resource_type"] as! String
-            let spotifyId = args["spotify_id"] as! String
-            let response = GobackendConvertSpotifyToDeezer(resourceType, spotifyId, &error)
-            if let error = error { throw error }
-            return response
-
-        case "getSpotifyMetadataWithFallback":
-            let args = call.arguments as! [String: Any]
-            let url = args["url"] as! String
-            let response = GobackendGetSpotifyMetadataWithDeezerFallback(url, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "checkAvailabilityFromDeezerID":
-            let args = call.arguments as! [String: Any]
-            let deezerTrackId = args["deezer_track_id"] as! String
-            let response = GobackendCheckAvailabilityFromDeezerID(deezerTrackId, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "checkAvailabilityByPlatformID":
-            let args = call.arguments as! [String: Any]
-            let platform = args["platform"] as! String
-            let entityType = args["entity_type"] as! String
-            let entityId = args["entity_id"] as! String
-            let response = GobackendCheckAvailabilityByPlatformID(platform, entityType, entityId, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "getSpotifyIDFromDeezerTrack":
-            let args = call.arguments as! [String: Any]
-            let deezerTrackId = args["deezer_track_id"] as! String
-            let response = GobackendGetSpotifyIDFromDeezerTrack(deezerTrackId, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "getTidalURLFromDeezerTrack":
-            let args = call.arguments as! [String: Any]
-            let deezerTrackId = args["deezer_track_id"] as! String
-            let response = GobackendGetTidalURLFromDeezerTrack(deezerTrackId, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "getAmazonURLFromDeezerTrack":
-            let args = call.arguments as! [String: Any]
-            let deezerTrackId = args["deezer_track_id"] as! String
-            let response = GobackendGetAmazonURLFromDeezerTrack(deezerTrackId, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "preWarmTrackCache":
-            let args = call.arguments as! [String: Any]
-            let tracksJson = args["tracks"] as! String
-            let _ = GobackendPreWarmTrackCacheJSON(tracksJson, &error)
-            if let error = error { throw error }
-            return nil
-            
-        case "getTrackCacheSize":
-            let response = GobackendGetTrackCacheSize()
-            return response
-            
-        case "clearTrackCache":
-            GobackendClearTrackCache()
-            return nil
-            
-        case "setSpotifyCredentials":
-            let args = call.arguments as! [String: Any]
-            let clientId = args["client_id"] as! String
-            let clientSecret = args["client_secret"] as! String
-            GobackendSetSpotifyAPICredentials(clientId, clientSecret)
-            return nil
-            
-        case "hasSpotifyCredentials":
-            let hasCredentials = GobackendCheckSpotifyCredentials()
-            return hasCredentials
-            
-        // Log methods
-        case "getLogs":
-            let response = GobackendGetLogs()
-            return response
-            
-        case "getLogsSince":
-            let args = call.arguments as! [String: Any]
-            let index = args["index"] as? Int ?? 0
-            let response = GobackendGetLogsSince(Int(index))
-            return response
-            
-        case "clearLogs":
-            GobackendClearLogs()
-            return nil
-            
-        case "getLogCount":
-            let response = GobackendGetLogCount()
-            return response
-            
-        case "setLoggingEnabled":
-            let args = call.arguments as! [String: Any]
-            let enabled = args["enabled"] as? Bool ?? false
-            GobackendSetLoggingEnabled(enabled)
-            return nil
-            
-        // Extension System methods
-        case "initExtensionSystem":
-            let args = call.arguments as! [String: Any]
-            let extensionsDir = args["extensions_dir"] as! String
-            let dataDir = args["data_dir"] as! String
-            GobackendInitExtensionSystem(extensionsDir, dataDir, &error)
-            if let error = error { throw error }
-            return nil
-            
-        case "loadExtensionsFromDir":
-            let args = call.arguments as! [String: Any]
-            let dirPath = args["dir_path"] as! String
-            let response = GobackendLoadExtensionsFromDir(dirPath, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "loadExtensionFromPath":
-            let args = call.arguments as! [String: Any]
-            let filePath = args["file_path"] as! String
-            let response = GobackendLoadExtensionFromPath(filePath, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "unloadExtension":
-            let args = call.arguments as! [String: Any]
-            let extensionId = args["extension_id"] as! String
-            GobackendUnloadExtensionByID(extensionId, &error)
-            if let error = error { throw error }
-            return nil
-            
-        case "getInstalledExtensions":
-            let response = GobackendGetInstalledExtensions(&error)
-            if let error = error { throw error }
-            return response
-            
-        case "setExtensionEnabled":
-            let args = call.arguments as! [String: Any]
-            let extensionId = args["extension_id"] as! String
-            let enabled = args["enabled"] as? Bool ?? false
-            GobackendSetExtensionEnabledByID(extensionId, enabled, &error)
-            if let error = error { throw error }
-            return nil
-            
-        case "setProviderPriority":
-            let args = call.arguments as! [String: Any]
-            let priorityJson = args["priority"] as! String
-            GobackendSetProviderPriorityJSON(priorityJson, &error)
-            if let error = error { throw error }
-            return nil
-            
-        case "getProviderPriority":
-            let response = GobackendGetProviderPriorityJSON(&error)
-            if let error = error { throw error }
-            return response
-            
-        case "setMetadataProviderPriority":
-            let args = call.arguments as! [String: Any]
-            let priorityJson = args["priority"] as! String
-            GobackendSetMetadataProviderPriorityJSON(priorityJson, &error)
-            if let error = error { throw error }
-            return nil
-            
-        case "getMetadataProviderPriority":
-            let response = GobackendGetMetadataProviderPriorityJSON(&error)
-            if let error = error { throw error }
-            return response
-            
-        case "getExtensionSettings":
-            let args = call.arguments as! [String: Any]
-            let extensionId = args["extension_id"] as! String
-            let response = GobackendGetExtensionSettingsJSON(extensionId, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "setExtensionSettings":
-            let args = call.arguments as! [String: Any]
-            let extensionId = args["extension_id"] as! String
-            let settingsJson = args["settings"] as! String
-            GobackendSetExtensionSettingsJSON(extensionId, settingsJson, &error)
-            if let error = error { throw error }
-            return nil
-            
-        case "invokeExtensionAction":
-            let args = call.arguments as! [String: Any]
-            let extensionId = args["extension_id"] as! String
-            let actionName = args["action"] as! String
-            let response = GobackendInvokeExtensionActionJSON(extensionId, actionName, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "searchTracksWithExtensions":
-            let args = call.arguments as! [String: Any]
-            let query = args["query"] as! String
-            let limit = args["limit"] as? Int ?? 20
-            let response = GobackendSearchTracksWithExtensionsJSON(query, Int(limit), &error)
-            if let error = error { throw error }
-            return response
-            
-        case "downloadWithExtensions":
-            let requestJson = call.arguments as! String
-            let response = GobackendDownloadWithExtensionsJSON(requestJson, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "enrichTrackWithExtension":
-            let args = call.arguments as! [String: Any]
-            let extensionId = args["extension_id"] as! String
-            let trackJson = args["track"] as? String ?? "{}"
-            let response = GobackendEnrichTrackWithExtensionJSON(extensionId, trackJson, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "removeExtension":
-            let args = call.arguments as! [String: Any]
-            let extensionId = args["extension_id"] as! String
-            GobackendRemoveExtensionByID(extensionId, &error)
-            if let error = error { throw error }
-            return nil
-            
-        case "upgradeExtension":
-            let args = call.arguments as! [String: Any]
-            let filePath = args["file_path"] as! String
-            let response = GobackendUpgradeExtensionFromPath(filePath, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "checkExtensionUpgrade":
-            let args = call.arguments as! [String: Any]
-            let filePath = args["file_path"] as! String
-            let response = GobackendCheckExtensionUpgradeFromPath(filePath, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "cleanupExtensions":
-            GobackendCleanupExtensions()
-            return nil
-            
-        // Extension Auth API
-        case "getExtensionPendingAuth":
-            let args = call.arguments as! [String: Any]
-            let extensionId = args["extension_id"] as! String
-            let response = GobackendGetExtensionPendingAuthJSON(extensionId, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "setExtensionAuthCode":
-            let args = call.arguments as! [String: Any]
-            let extensionId = args["extension_id"] as! String
-            let authCode = args["auth_code"] as! String
-            GobackendSetExtensionAuthCodeByID(extensionId, authCode)
-            return nil
-            
-        case "setExtensionTokens":
-            let args = call.arguments as! [String: Any]
-            let extensionId = args["extension_id"] as! String
-            let accessToken = args["access_token"] as! String
-            let refreshToken = args["refresh_token"] as? String ?? ""
-            let expiresIn = args["expires_in"] as? Int ?? 0
-            GobackendSetExtensionTokensByID(extensionId, accessToken, refreshToken, Int(expiresIn))
-            return nil
-            
-        case "clearExtensionPendingAuth":
-            let args = call.arguments as! [String: Any]
-            let extensionId = args["extension_id"] as! String
-            GobackendClearExtensionPendingAuthByID(extensionId)
-            return nil
-            
-        case "isExtensionAuthenticated":
-            let args = call.arguments as! [String: Any]
-            let extensionId = args["extension_id"] as! String
-            let response = GobackendIsExtensionAuthenticatedByID(extensionId)
-            return response
-            
-        case "getAllPendingAuthRequests":
-            let response = GobackendGetAllPendingAuthRequestsJSON(&error)
-            if let error = error { throw error }
-            return response
-            
-        // Extension FFmpeg API
-        case "getPendingFFmpegCommand":
-            let args = call.arguments as! [String: Any]
-            let commandId = args["command_id"] as! String
-            let response = GobackendGetPendingFFmpegCommandJSON(commandId, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "setFFmpegCommandResult":
-            let args = call.arguments as! [String: Any]
-            let commandId = args["command_id"] as! String
-            let success = args["success"] as? Bool ?? false
-            let output = args["output"] as? String ?? ""
-            let errorMsg = args["error"] as? String ?? ""
-            GobackendSetFFmpegCommandResult(commandId, success, output, errorMsg)
-            return nil
-            
-        case "getAllPendingFFmpegCommands":
-            let response = GobackendGetAllPendingFFmpegCommandsJSON(&error)
-            if let error = error { throw error }
-            return response
-            
-        // Extension Custom Search API
-        case "customSearchWithExtension":
-            let args = call.arguments as! [String: Any]
-            let extensionId = args["extension_id"] as! String
-            let query = args["query"] as! String
-            let optionsJson = args["options"] as? String ?? ""
-            let response = GobackendCustomSearchWithExtensionJSON(extensionId, query, optionsJson, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "getSearchProviders":
-            let response = GobackendGetSearchProvidersJSON(&error)
-            if let error = error { throw error }
-            return response
-            
-        // Extension URL Handler API
-        case "handleURLWithExtension":
-            let args = call.arguments as! [String: Any]
-            let url = args["url"] as! String
-            let response = GobackendHandleURLWithExtensionJSON(url, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "findURLHandler":
-            let args = call.arguments as! [String: Any]
-            let url = args["url"] as! String
-            let response = GobackendFindURLHandlerJSON(url)
-            return response
-            
-        case "getURLHandlers":
-            let response = GobackendGetURLHandlersJSON(&error)
-            if let error = error { throw error }
-            return response
-            
-        case "getAlbumWithExtension":
-            let args = call.arguments as! [String: Any]
-            let extensionId = args["extension_id"] as! String
-            let albumId = args["album_id"] as! String
-            let response = GobackendGetAlbumWithExtensionJSON(extensionId, albumId, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "getPlaylistWithExtension":
-            let args = call.arguments as! [String: Any]
-            let extensionId = args["extension_id"] as! String
-            let playlistId = args["playlist_id"] as! String
-            let response = GobackendGetPlaylistWithExtensionJSON(extensionId, playlistId, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "getArtistWithExtension":
-            let args = call.arguments as! [String: Any]
-            let extensionId = args["extension_id"] as! String
-            let artistId = args["artist_id"] as! String
-            let response = GobackendGetArtistWithExtensionJSON(extensionId, artistId, &error)
-            if let error = error { throw error }
-            return response
-            
-        // Extension Post-Processing API
-        case "runPostProcessing":
-            let args = call.arguments as! [String: Any]
-            let filePath = args["file_path"] as! String
-            let metadataJson = args["metadata"] as? String ?? ""
-            let response = GobackendRunPostProcessingJSON(filePath, metadataJson, &error)
-            if let error = error { throw error }
-            return response
-
-        case "runPostProcessingV2":
-            let args = call.arguments as! [String: Any]
-            let inputJson = args["input"] as? String ?? ""
-            let metadataJson = args["metadata"] as? String ?? ""
-            let response = GobackendRunPostProcessingV2JSON(inputJson, metadataJson, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "getPostProcessingProviders":
-            let response = GobackendGetPostProcessingProvidersJSON(&error)
-            if let error = error { throw error }
-            return response
-            
-        // Extension Store
-        case "initExtensionStore":
-            let args = call.arguments as! [String: Any]
-            let cacheDir = args["cache_dir"] as! String
-            GobackendInitExtensionStoreJSON(cacheDir, &error)
-            if let error = error { throw error }
-            return nil
-            
-        case "getStoreExtensions":
-            let args = call.arguments as! [String: Any]
-            let forceRefresh = args["force_refresh"] as? Bool ?? false
-            let response = GobackendGetStoreExtensionsJSON(forceRefresh, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "searchStoreExtensions":
-            let args = call.arguments as! [String: Any]
-            let query = args["query"] as? String ?? ""
-            let category = args["category"] as? String ?? ""
-            let response = GobackendSearchStoreExtensionsJSON(query, category, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "getStoreCategories":
-            let response = GobackendGetStoreCategoriesJSON(&error)
-            if let error = error { throw error }
-            return response
-            
-        case "downloadStoreExtension":
-            let args = call.arguments as! [String: Any]
-            let extensionId = args["extension_id"] as! String
-            let destDir = args["dest_dir"] as! String
-            let response = GobackendDownloadStoreExtensionJSON(extensionId, destDir, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "clearStoreCache":
-            GobackendClearStoreCacheJSON(&error)
-            if let error = error { throw error }
-            return nil
-            
-        // Extension Home Feed API
-        case "getExtensionHomeFeed":
-            let args = call.arguments as! [String: Any]
-            let extensionId = args["extension_id"] as! String
-            let response = GobackendGetExtensionHomeFeedJSON(extensionId, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "getExtensionBrowseCategories":
-            let args = call.arguments as! [String: Any]
-            let extensionId = args["extension_id"] as! String
-            let response = GobackendGetExtensionBrowseCategoriesJSON(extensionId, &error)
-            if let error = error { throw error }
-            return response
-            
-        // Local Library Scanning
-        case "setLibraryCoverCacheDir":
-            let args = call.arguments as! [String: Any]
-            let cacheDir = args["cache_dir"] as! String
-            GobackendSetLibraryCoverCacheDirJSON(cacheDir)
-            return nil
-            
-        case "scanLibraryFolder":
-            let args = call.arguments as! [String: Any]
-            let folderPath = args["folder_path"] as! String
-            let response = GobackendScanLibraryFolderJSON(folderPath, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "scanLibraryFolderIncremental":
-            let args = call.arguments as! [String: Any]
-            let folderPath = args["folder_path"] as! String
-            let existingFiles = args["existing_files"] as? String ?? "{}"
-            let response = GobackendScanLibraryFolderIncrementalJSON(folderPath, existingFiles, &error)
-            if let error = error { throw error }
-            return response
-            
-        case "getLibraryScanProgress":
-            let response = GobackendGetLibraryScanProgressJSON()
-            return response
-            
-        case "cancelLibraryScan":
-            GobackendCancelLibraryScanJSON()
-            return nil
-            
-        case "readAudioMetadata":
-            let args = call.arguments as! [String: Any]
-            let filePath = args["file_path"] as! String
-            let response = GobackendReadAudioMetadataJSON(filePath, &error)
-            if let error = error { throw error }
-            return response
-            
         default:
             throw NSError(
                 domain: "SpotiFLAC",