v2.2.5: In-app logging, ISP blocking detection, Latin script fix

Updated VirusTotal badge link to the latest report.

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,123 @@
+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
+          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

@@ -0,0 +1,5 @@
+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

.github/ISSUE_TEMPLATE/download_issue.yml

@@ -0,0 +1,111 @@
+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
+          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/feature_request.yml

@@ -0,0 +1,66 @@
+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

@@ -1,75 +0,0 @@
-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

@@ -1,69 +0,0 @@
-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

@@ -0,0 +1,77 @@
+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

@@ -1,118 +0,0 @@
-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)
@@ -17,35 +17,61 @@ 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
-            echo "version=${{ github.event.inputs.version }}" >> $GITHUB_OUTPUT
+            VERSION="${{ github.event.inputs.version }}"
           else
-            echo "version=${GITHUB_REF#refs/tags/}" >> $GITHUB_OUTPUT
+            VERSION="${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"
           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: '1.21'
+          go-version: "1.21"
           cache-dependency-path: go_backend/go.sum
 
       # Cache Gradle for faster builds
@@ -59,7 +85,20 @@ jobs:
           restore-keys: gradle-${{ runner.os }}-
 
       - name: Install Android SDK & NDK
-        uses: android-actions/setup-android@v3
+        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
 
       - name: Install gomobile
         run: |
@@ -77,7 +116,7 @@ jobs:
       - name: Setup Flutter
         uses: subosito/flutter-action@v2
         with:
-          channel: 'stable'
+          channel: "stable"
           cache: true
 
       - name: Get Flutter dependencies
@@ -86,16 +125,36 @@ jobs:
       - name: Generate app icons
         run: dart run flutter_launcher_icons
 
-      - name: Build APK (Release)
-        run: flutter build apk --release --split-per-abi
+      - 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: Rename APKs
         run: |
           VERSION=${{ needs.get-version.outputs.version }}
           cd build/app/outputs/flutter-apk
-          mv app-arm64-v8a-release.apk SpotiFLAC-${VERSION}-arm64.apk || true
-          mv app-armeabi-v7a-release.apk SpotiFLAC-${VERSION}-arm32.apk || true
-          mv app-release.apk SpotiFLAC-${VERSION}-universal.apk || true
+          # 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
           ls -la
 
       - name: Upload APK artifact
@@ -106,8 +165,8 @@ 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
@@ -115,7 +174,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.21'
+          go-version: "1.21"
           cache-dependency-path: go_backend/go.sum
 
       # Cache CocoaPods
@@ -143,53 +202,70 @@ 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
 
+      # Swap pubspec for iOS build (includes ffmpeg_kit_flutter)
+      - name: Use iOS pubspec with FFmpeg plugin
+        run: |
+          cp pubspec.yaml pubspec_android_backup.yaml
+          cp pubspec_ios.yaml pubspec.yaml
+          echo "Swapped to iOS pubspec with ffmpeg_kit_flutter"
+
+      # Swap FFmpeg service for iOS
+      - name: Use iOS FFmpeg service
+        run: |
+          cp lib/services/ffmpeg_service.dart lib/services/ffmpeg_service_android.dart
+          cp build_assets/ffmpeg_service_ios.dart lib/services/ffmpeg_service.dart
+          # Update class name in the swapped file
+          sed -i '' 's/FFmpegServiceIOS/FFmpegService/g' lib/services/ffmpeg_service.dart
+          sed -i '' 's/FFmpegResultIOS/FFmpegResult/g' lib/services/ffmpeg_service.dart
+          echo "Swapped to iOS FFmpeg service"
+
       - name: Get Flutter dependencies
         run: flutter pub get
 
@@ -197,18 +273,44 @@ jobs:
         run: dart run flutter_launcher_icons
 
       - name: Build iOS (unsigned)
-        run: flutter build ios --release --no-codesign
+        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=""
 
       - name: Create IPA
         run: |
           VERSION=${{ needs.get-version.outputs.version }}
           mkdir -p build/ios/ipa
-          cd build/ios/iphoneos
+          cd ios/build/Runner.xcarchive/Products/Applications
           mkdir Payload
           cp -r Runner.app Payload/
-          zip -r ../ipa/SpotiFLAC-${VERSION}-ios-unsigned.ipa Payload
+          # Use absolute path to avoid relative path issues
+          zip -r $GITHUB_WORKSPACE/build/ios/ipa/SpotiFLAC-${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:
@@ -220,7 +322,7 @@ jobs:
     needs: [get-version, build-android, build-ios]
     permissions:
       contents: write
-    
+
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
@@ -230,13 +332,13 @@ 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)
-          
+
           # If no changelog found, use default message
           if [ -z "$CHANGELOG" ]; then
             echo "No changelog found for version $VERSION_NUM"
@@ -244,7 +346,7 @@ jobs:
           else
             echo "Found changelog content"
           fi
-          
+
           # Save to file for multiline support
           echo "$CHANGELOG" > /tmp/changelog.txt
           echo "Extracted changelog:"
@@ -266,32 +368,34 @@ 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-${VERSION}-arm64.apk\` (recommended)
-          - **Android (arm32)**: \`SpotiFLAC-${VERSION}-arm32.apk\` (older devices)
+
+          #### Android
+          - **arm64**: \`SpotiFLAC-${VERSION}-arm64.apk\` (recommended for modern devices)
+          - **arm32**: \`SpotiFLAC-${VERSION}-arm32.apk\` (older devices)
+
+          #### iOS
           - **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
 
@@ -303,6 +407,6 @@ jobs:
           body_path: /tmp/release_body.txt
           files: ./release/*
           draft: false
-          prerelease: false
+          prerelease: ${{ needs.get-version.outputs.is_prerelease == 'true' }}
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.gitignore

@@ -13,9 +13,6 @@ Thumbs.db
 # Reference folder (development only)
 referensi/
 
-# Development notes
-COMPARISON_PC_vs_ANDROID.md
-
 # Old spotiflac_android folder (moved to root)
 spotiflac_android/
 
@@ -28,6 +25,7 @@ build/
 .flutter-plugins
 .flutter-plugins-dependencies
 .metadata
+*.apk
 
 # Go backend build artifacts
 go_backend/*.aar
@@ -37,9 +35,13 @@ go_backend/*.xcframework/
 
 # Android
 android/.gradle/
-android/app/libs/
+android/app/libs/gobackend.aar
 android/local.properties
 android/*.iml
+android/key.properties
+android/*.jks
+android/*.keystore
+android/app/*.jks
 
 # iOS
 ios/Frameworks/
@@ -47,3 +49,4 @@ ios/Pods/
 ios/.symlinks/
 ios/Flutter/Flutter.framework/
 ios/Flutter/Flutter.podspec
+android/app/libs/gobackend-sources.jar

CHANGELOG.md

@@ -1,8 +1,759 @@
 # Changelog
 
+## [2.2.5] - 2026-01-10
+
+### Added
+
+- **In-App Log Viewer with Go Backend Logs**: Complete logging system for debugging
+  - Go backend logs now captured and displayed in app
+  - Circular buffer stores up to 500 log entries
+  - Real-time polling (500ms) for Go backend logs
+  - Logs include timestamp, level, tag, and message
+  - "Go" badge indicates logs from backend
+- **Detailed Logging Toggle**: Control logging in Settings > Options > Debug
+  - Disabled by default for performance
+  - Errors are always logged regardless of setting
+  - Enable before reproducing bugs for detailed logs
+- **Log Issue Summary**: Automatic detection of common issues in logs
+  - ISP Blocking detection with affected domains
+  - Rate limiting detection
+  - Network error detection
+  - Track not found detection
+  - Shows suggestions for each issue type
+- **ISP Blocking Detection**: Detects when ISP blocks download services
+  - DNS resolution failure detection
+  - Connection reset/refused detection
+  - TLS handshake failure detection
+  - HTTP 403/451 blocking page detection
+  - Suggests VPN or DNS change (1.1.1.1 / 8.8.8.8)
+
+### Fixed
+
+- **Artist Profile Placeholder**: Shows person icon when artist has no profile image
+  - Validates image URL before loading
+  - Fallback icon on load error
+- **Latin Extended Character Detection**: Fixed wrong track downloads for Polish, Czech, French, Spanish songs
+  - Characters like Ł, ę, ć, ñ, é now correctly treated as Latin script
+  - Previously treated as "different script" causing false matches
+  - Affects both Tidal and Qobuz search
+
+### Changed
+
+- **Log Screen UI Improvements**:
+  - Copy button moved to app bar (left of menu)
+  - Removed redundant info card
+  - Cleaner interface
+- **Issue Templates Updated**: Instructions for enabling detailed logging before submitting bug reports
+
+### Technical
+
+- New file: `go_backend/logbuffer.go` with circular buffer and GoLog function
+- Updated `go_backend/httputil.go` with ISP blocking detection
+- Updated `go_backend/tidal.go` and `go_backend/qobuz.go` with `isLatinScript()` function
+- Updated `lib/utils/logger.dart` with Go log polling
+- Updated `lib/screens/settings/log_screen.dart` with issue summary
+- Added method channel handlers for logging in Android and iOS
+- New error type: `isp_blocked` for ISP blocking errors
+
+---
+
+## [2.2.0] - 2026-01-10
+
+### Fixed
+
+- **ISRC Metadata Missing:** Fixed an issue where ISRC codes were not being saved to the download history or embedded in file metadata for certain downloads. The backend now correctly propagates the ISRC found from streaming services (Tidal, Qobuz, Amazon) back to the application.
+- **Tidal Track/Disc Numbers:** Fixed missing Track Number and Disc Number in Tidal downloads. The downloader now prioritizes the actual metadata returned by Tidal over the potentially incomplete metadata from the initial search request.
+- **Concurrent Download Race Condition:** Fixed a potential race condition where temporary cover art files could overwrite each other during rapid concurrent downloads by adding randomization to temporary filenames.
+- **Qobuz Search Accuracy:** Reduced the duration tolerance for Qobuz search matches from 30s to 10s to prevent matching with incorrect versions/remixes.
+- **Metadata Enrichment Null Safety**: Fixed `type 'Null' is not a subtype of type 'String'` error
+  - Added proper null checks when parsing Go backend response
+  - Added type checking for track data before parsing
+- **Duration Calculation in Enrichment**: Fixed duration conversion bug
+  - Go backend returns `duration_ms` (milliseconds)
+  - Now properly converts to seconds for Track model
+
+### Changed
+
+- **Default Service Priority:** Updated the default download fallback order to **Tidal → Qobuz → Amazon**.
+  - Tidal is now the default download service (was Qobuz)
+  - Tidal has faster and more reliable ISRC matching
+  - Existing users need to change setting manually or clear app data
+- **Metadata Enrichment:** Improved metadata handling for Deezer tracks. If critical metadata (ISRC, Track Number) is missing from the initial search, the app now automatically fetches full details from the Deezer API before finding a source.
+
+### Added
+
+- **ISRC in History:** The Download History now reliably displays the ISRC code for downloaded tracks.
+- **Tidal Search Optimization:** Optimized Tidal search logic to immediately check for ISRC matches within search results, improving match speed and accuracy.
+  - Returns as soon as ISRC match is found in first query results
+  - Significantly faster for tracks with valid ISRC
+- **ISRC Enrichment for Search Results**: Tracks from Home search now fetch ISRC before download
+  - Search results don't include ISRC (for performance)
+  - ISRC is now fetched via metadata enrichment when download starts
+  - Ensures accurate track matching on all streaming services
+- **Deezer-to-Tidal Fallback:** Added native support for converting Deezer IDs to Tidal links via SongLink when using the fallback mechanism.
+- **Better Logging for Qobuz ISRC Search**: Added detailed logs for debugging
+  - Shows when ISRC search is attempted
+  - Shows number of results and exact ISRC matches found
+
+### Technical
+
+- Updated `go_backend/tidal.go`:
+  - Early exit optimization in `SearchTrackByMetadataWithISRC()`
+  - Deezer ID support in SongLink lookup
+- Updated `go_backend/qobuz.go`:
+  - Added logging for ISRC search flow
+  - Duration tolerance reduced from 30s to 10s
+- Updated `go_backend/exports.go`:
+  - Default service order changed to `[tidal, qobuz, amazon]`
+- Updated `lib/providers/download_queue_provider.dart`:
+  - ISRC-based enrichment condition
+  - Null-safe parsing of Go backend response
+- Updated `lib/services/platform_bridge.dart`:
+  - Null check for `getDeezerMetadata` result
+- Updated `lib/models/settings.dart`:
+  - Default service changed to `tidal`
+
+---
+
+## [2.1.7] - 2026-01-09
+
+### Added
+
+- **Special Thanks Section**: Added new "Special Thanks" section in About page to credit API creators
+  - **uimaxbai** - Creator of QQDL & HiFi API for Tidal downloads
+  - **sachinsenal0x64** - Original HiFi project creator, foundation of Tidal integration
+  - **DoubleDouble** - Amazing API for Amazon Music downloads
+  - **DAB Music** - The best Qobuz streaming API for Hi-Res downloads
+- **New Contributor**: Added Amonoman to Contributors section as the app logo creator
+
+### Fixed
+
+- **Missing PlatformBridge Import**: Fixed build errors in `home_tab.dart` and `playlist_screen.dart`
+  - Added missing `import 'package:spotiflac_android/services/platform_bridge.dart'`
+- **iOS Method Channel Crash**: Fixed "Method not implemented" crash when searching Deezer from iOS
+  - Implemented missing `searchDeezerAll` handler in `AppDelegate.swift`
+  - Ensures full compatibility with new Deezer integration features on iOS
+
+---
+
+## [2.1.6] - 2026-01-08
+
+### Added
+
+- **Metadata Enrichment**: Automatically fetches full track details if metadata is incomplete (e.g., Track Number 0)
+  - Fixes missing Track Number, Disc Number, and Year for tracks added from Search results
+  - Ensures accurate tagging for Deezer/Tidal downloads
+- **ISRC Index Building**: Fast duplicate checking with cached ISRC index
+
+  - Scans download folder once and builds index of all ISRCs
+  - 5 minute cache TTL for optimal performance
+  - Parallel duplicate checking for album/playlist tracks
+  - Auto-adds new downloads to index (no rebuild needed)
+
+- **Japanese to Romaji Search**: Better search results for Japanese tracks
+
+  - Converts Hiragana/Katakana to Romaji for Tidal/Qobuz search
+  - 4 fallback search strategies (like PC version):
+    1. Original text (artist + track)
+    2. Romaji converted (artist + track)
+    3. ASCII-only cleaned version
+    4. Artist name only as last resort
+  - Handles combination characters (きゃ →kya, シャ →sha, etc.)
+
+- **SongLink Deezer Support**: Query SongLink using Deezer ID as source
+
+  - `CheckAvailabilityFromDeezer()` - find track on other platforms using Deezer ID
+  - `CheckAvailabilityByPlatform()` - generic function for any platform
+  - `GetSpotifyIDFromDeezer()`, `GetTidalURLFromDeezer()`, `GetAmazonURLFromDeezer()`
+  - Useful when starting from Deezer metadata
+
+- **LRC Metadata Headers**: Lyrics now include metadata headers
+
+  - `[ti:Track Name]` - track title
+  - `[ar:Artist Name]` - artist name
+  - `[by:SpotiFLAC-Mobile]` - generator tag
+
+- **Download Error Types**: Better error categorization for UI
+
+  - `not_found` - track not available on any service
+  - `rate_limit` - API rate limit exceeded
+  - `network` - connection/timeout errors
+  - `unknown` - other errors
+
+- **Amazon Rate Limiting**: Proper rate limiting for Amazon via SongLink
+  - 7 second minimum delay between requests
+  - Max 9 requests per minute
+  - 3x retry with 15s wait on 429 rate limit
+
+### Fixed
+
+- **SongLink 400 Error**: Added validation for empty Spotify ID
+
+  - Specific error messages for 400, 404, 429 status codes
+  - Better error handling for invalid track IDs
+
+- **gomobile Compatibility**: Fixed `ISRCIndex.Lookup()` signature
+  - Changed from `(string, bool)` to `(string, error)` for gomobile binding
+
+### Technical
+
+- New file: `go_backend/romaji.go` with Japanese to Romaji conversion
+- New file: `go_backend/duplicate.go` with ISRC index building
+- Updated `go_backend/tidal.go` and `go_backend/qobuz.go` with romaji search strategies
+- Updated `go_backend/songlink.go` with Deezer support functions
+- Updated `go_backend/exports.go` with new export functions for Flutter
+- Updated `go_backend/lyrics.go` with `convertToLRCWithMetadata()`
+- Updated `go_backend/progress.go` with `SpeedMBps` field
+- Updated `lib/models/download_item.dart` with `DownloadErrorType` enum
+- Updated `lib/screens/queue_tab.dart` with speed display and error messages
+
+---
+
+## [2.1.6-preview] - 2026-01-08
+
+### Added
+
+- **Deezer as Alternative Metadata Source**: Choose between Deezer or Spotify for search
+
+  - Configure in Settings > Options > Spotify API > Search Source
+  - Default is Deezer for better reliability
+  - Spotify URLs are always supported regardless of this setting
+
+- **Automatic Deezer Fallback for Spotify URLs**: When Spotify API is rate limited (429), automatically falls back to Deezer
+  - Uses SongLink/Odesli API to convert Spotify track/album ID to Deezer ID
+  - Fetches metadata from Deezer instead
+
+### Changed
+
+- **Default Download Service**: Changed from Tidal to Qobuz
+  - Fallback order is now: Qobuz → Tidal → Amazon
+- **Deezer API Updated to v2.0**: More reliable and complete metadata
+  - Direct ISRC lookup via `/track/isrc:{ISRC}` endpoint
+  - Search results now fetch full track info to include ISRC
+
+### Fixed
+
+- **Progress Bar Not Updating**: Fixed bug where download progress jumped from 1% directly to 100%
+  - Progress now updates smoothly every 64KB of data received
+  - First progress update happens immediately when download starts
+- **Incomplete Downloads**: Fixed bug where interrupted downloads could result in corrupted/incomplete files
+  - File size is validated against server's Content-Length header
+  - Incomplete files are automatically deleted and error is reported
+  - Applies to all services: Tidal, Qobuz, and Amazon
+- **ISRC Not Available from Deezer Search**: Search results now fetch full track details to get ISRC
+
+### Technical
+
+- Settings migration for existing users to set Deezer as default metadata source
+
+---
+
+## [2.1.5] - 2026-01-08
+
+### Added
+
+- **Service Switcher in Quality Picker**: Choose download service (Tidal/Qobuz/Amazon) directly when selecting quality
+  - Service selector chips appear above quality options
+  - Defaults to your preferred service from settings
+  - Change service on-the-fly without going to settings
+  - Available in Home, Album, and Playlist screens
+- **AMOLED Dark Theme**: Pure black background for OLED screens
+  - Toggle in Settings > Appearance > Theme
+  - Saves battery on OLED/AMOLED displays
+  - All surface colors adjusted for true black background
+- **Update Channel Setting**: Choose between Stable and Preview release channels
+  - Stable: Only receive stable release notifications
+  - Preview: Get notified about preview/beta releases too
+  - Configure in Settings > Options > App
+
+### Changed
+
+- **Reduced APK Size**: Replaced FFmpeg plugin with custom AAR containing only required codecs
+  - arm64 APK: 46.6 MB (previously 51 MB)
+  - arm32 APK: 59 MB (previously 64 MB)
+  - Only includes FLAC, MP3 (LAME), and AAC codecs
+  - Custom FFmpeg AAR with arm64-v8a and armeabi-v7a only
+  - Native MethodChannel bridge for FFmpeg operations
+  - Separate iOS build configuration with ffmpeg_kit_flutter plugin
+
+### Fixed
+
+- **Retry Failed Downloads**: Fixed issue where retrying failed downloads sometimes did nothing
+  - Now properly handles retry when queue processing has finished
+  - Also allows retrying skipped (cancelled) downloads
+- **Lyrics Loading Timeout**: Added 20 second timeout for lyrics fetching
+  - Shows "Lyrics not available" instead of loading forever
+- **iOS Directory Picker**: Fixed unable to select download folder on iOS
+  - iOS limitation: Empty folders cannot be selected via document picker
+  - Added "App Documents Folder" option as recommended default
+  - Files saved to app Documents folder are accessible via iOS Files app
+
+### Performance
+
+- **Download Speed Optimizations**: Significant improvements to download initialization and throughput
+  - Token caching for Tidal (eliminates redundant auth requests)
+  - Singleton pattern for all downloaders (HTTP connection reuse)
+  - ISRC search first strategy (faster than SongLink API)
+  - Track ID cache with 30 minute TTL for album/playlist downloads
+  - Pre-warm cache when viewing album/playlist
+  - Parallel cover art and lyrics fetching during audio download
+  - 64KB HTTP read/write buffers
+  - 256KB buffered file writer for all downloaders
+  - Progress updates every 64KB (reduced lock contention)
+- **Amazon Music Optimizations**: Same optimizations now applied to Amazon downloader
+
+## [2.1.0-preview2] - 2026-01-06
+
+### Added
+
+- **Service Switcher in Quality Picker**: Choose download service (Tidal/Qobuz/Amazon) directly when selecting quality
+  - Service selector chips appear above quality options
+  - Defaults to your preferred service from settings
+  - Change service on-the-fly without going to settings
+  - Available in Home, Album, and Playlist screens
+- **AMOLED Dark Theme**: Pure black background for OLED screens
+  - Toggle in Settings > Appearance > Theme
+  - Saves battery on OLED/AMOLED displays
+  - All surface colors adjusted for true black background
+- **Update Channel Setting**: Choose between Stable and Preview release channels
+  - Stable: Only receive stable release notifications
+  - Preview: Get notified about preview/beta releases too
+  - Configure in Settings > Options > App
+
+### Fixed
+
+- **Retry Failed Downloads**: Fixed issue where retrying failed downloads sometimes did nothing
+  - Now properly handles retry when queue processing has finished
+  - Also allows retrying skipped (cancelled) downloads
+  - Added logging for better debugging
+- **Lyrics Loading Timeout**: Added 20 second timeout for lyrics fetching
+  - Shows "Lyrics not available" instead of loading forever
+  - Better error messages for timeout and not found cases
+
+## [2.1.0-preview] - 2026-01-06
+
+### Performance
+
+- **Download Speed Optimizations**: Significant improvements to download initialization and throughput
+  - Token caching for Tidal (eliminates redundant auth requests)
+  - Singleton pattern for all downloaders (HTTP connection reuse)
+  - ISRC search first strategy (faster than SongLink API)
+  - Track ID cache with 30 minute TTL for album/playlist downloads
+  - Pre-warm cache when viewing album/playlist
+  - Parallel cover art and lyrics fetching during audio download
+  - 64KB HTTP read/write buffers
+  - 256KB buffered file writer for all downloaders
+  - Progress updates every 64KB (reduced lock contention)
+- **Amazon Music Optimizations**: Same optimizations now applied to Amazon downloader
+
+### Technical
+
+- New `go_backend/parallel.go` with `TrackIDCache`, `FetchCoverAndLyricsParallel()`, `PreWarmTrackCache()`
+- Flutter: `_preWarmCacheForTracks()` in `track_provider.dart`
+- New method channels: `preWarmTrackCache`, `getTrackCacheSize`, `clearTrackCache`
+
+## [2.0.7-preview2] - 2026-01-06
+
+### Fixed
+
+- **iOS Directory Picker**: Fixed unable to select download folder on iOS
+  - iOS limitation: Empty folders cannot be selected via document picker
+  - Added "App Documents Folder" option as recommended default
+  - Shows info message explaining iOS limitation
+  - Files saved to app Documents folder are accessible via iOS Files app
+
+## [2.0.7-preview] - 2026-01-05
+
+### Changed
+
+- **Reduced APK Size**: Replaced FFmpeg plugin with custom AAR containing only required codecs
+  - arm64 APK: 46.6 MB (previously 51 MB)
+  - arm32 APK: 59 MB (previously 64 MB)
+  - Only includes FLAC, MP3 (LAME), and AAC codecs
+  - Removed x86/x86_64 architectures (emulator only)
+
+### Technical
+
+- Custom FFmpeg AAR with arm64-v8a and armeabi-v7a only
+- Native MethodChannel bridge for FFmpeg operations
+- Separate iOS build configuration with ffmpeg_kit_flutter plugin
+
+## [2.0.6] - 2026-01-05
+
+### Fixed
+
+- **Duration Display Bug**: Fixed duration showing incorrect values like "4135:53" instead of "4:14"
+  - `duration_ms` (milliseconds) was being stored directly without conversion to seconds
+  - Now properly converts milliseconds to seconds before display
+- **Audio Quality from File**: Quality info (bit depth/sample rate) now read from actual FLAC file instead of trusting API
+  - More accurate quality display for all services (Tidal, Qobuz, Amazon)
+  - Also reads quality from existing files when skipping duplicates
+- **Artist Verification for Downloads**: Added artist name verification to prevent downloading wrong tracks
+  - Verifies artist matches between Spotify metadata and streaming service
+  - Handles different scripts (Japanese/Chinese vs Latin) as same artist with different transliteration
+  - Applied to Tidal, Qobuz, and Amazon downloads
+- **Metadata Case-Sensitivity**: Fixed FLAC metadata not being properly overwritten when downloaded file has lowercase tags
+  - Now uses case-insensitive comparison when replacing existing Vorbis comments
+  - Fixes issue where Amazon downloads could have duplicate metadata tags
+- **Settings Navigation Freeze**: Fixed app freezing when navigating back from settings sub-menus on some devices
+  - Added proper PopScope handling for predictive back gesture on Android 14+
+
+## [2.0.5] - 2026-01-05
+
+### Added
+
+- **Large Playlist Support**: Playlists with up to 1000 tracks are now fully fetched (was limited to 100)
+
+### Fixed
+
+- **Wrong Track Download**: Fixed issue where tracks with same ISRC but different versions (e.g., short/instrumental vs full version) would download the wrong track. Now verifies duration matches before downloading (30 second tolerance).
+
+## [2.0.4] - 2026-01-04
+
+### Fixed
+
+- **Android 11 Storage Permission**: Fixed "Permission denied" error on Android 11 (API 30) devices
+  - Added `MANAGE_EXTERNAL_STORAGE` permission for Android 11-12
+  - Shows explanation dialog before opening system settings
+
+## [2.0.3] - 2026-01-03
+
+### Added
+
+- **Custom Spotify API Credentials**: Set your own Spotify Client ID and Secret in Settings > Options to avoid rate limiting
+  - Toggle to enable/disable custom credentials without deleting them
+  - Material Expressive 3 bottom sheet UI for entering credentials
+- **Keyboard Dismiss on Scroll**: Keyboard now automatically dismisses when scrolling search results
+- **Rate Limit Error UI**: Shows friendly error card when API rate limit (429) is hit on Home, Artist, and Album screens
+
+### Changed
+
+- **Search on Enter Only**: Removed auto-search debounce, now only searches when pressing Enter key (saves API calls)
+
+### Fixed
+
+- **Download Cancel**: Fixed cancelled downloads still completing in background and appearing in history. Cancelled files are now properly deleted.
+- **Search Keyboard Dismiss**: Fixed keyboard randomly dismissing and navigating back when starting to search
+- **Back Button During Search**: Back button now properly dismisses keyboard first before clearing search
+- **Search Error Navigation**: Fixed pressing Enter during search (when loading or error) navigating back to home instead of staying on search screen
+- **Duplicate Search on Enter**: Enter key no longer triggers duplicate search if results already loaded
+
+## [2.0.2] - 2026-01-03
+
+### Added
+
+- **Actual Quality Display**: Shows real audio quality (bit depth/sample rate) after download
+  - Quality badge on download history items (e.g., "24-bit", "16-bit")
+  - Full quality info in Track Metadata screen (e.g., "24-bit/96kHz")
+  - Tertiary color highlight for Hi-Res (24-bit) downloads
+- **Quality Disclaimer**: Added note in quality picker explaining that actual quality depends on track availability
+- **Instant Lyrics Loading**: Lyrics now load from embedded file first (instant) before falling back to internet fetch
+
+### Fixed
+
+- **Fallback Service Display**: Fixed download history showing wrong service when fallback occurs (e.g., showing "TIDAL" when actually downloaded from "QOBUZ")
+- **Open in Spotify**: Fixed "Open in Spotify" button not opening Spotify app correctly
+
+### Removed
+
+- **Romaji Conversion**: Removed Japanese lyrics to romaji conversion feature (Kanji not supported, results were incomplete)
+
+### Technical
+
+- Go backend now returns `actual_bit_depth` and `actual_sample_rate` in download response
+- Go backend now returns `service` field indicating actual service used (important for fallback)
+- Tidal API v2 response provides exact quality info
+- Qobuz uses track metadata for quality info
+- Amazon now reads quality from downloaded FLAC file (previously returned unknown)
+
+## [2.0.1] - 2026-01-03
+
+### Added
+
+- **Quality Picker Track Info**: Shows track name, artist, and cover in quality picker
+  - Tap to expand long track titles
+  - Expand icon only shows when title is truncated
+  - Ripple effect follows rounded corners including drag handle
+
+### Changed
+
+- **Unified Progress Tracking System**: Deprecated legacy single-download progress
+  - All downloads now use item-based progress tracking
+  - Fixes duplicate notification bug when finalizing
+  - Cleaner codebase with single progress system
+
+### Fixed
+
+- **Duplicate Notification Bug**: Fixed issue where "Finalizing" and "Downloading" notifications appeared simultaneously
+- **Update Notification Stuck**: Fixed notification staying at 100% after download completes
+- **Quality Picker Consistency**: Unified quality picker UI across all screens (Home, Album, Playlist)
+  - Container with `primaryContainer` background for each option
+  - Distinct icons: music_note (Lossless), high_quality (Hi-Res), four_k (Max)
+
+## [2.0.0] - 2026-01-03
+
+### Added
+
+- **Artist Search Results**: Search now shows artists alongside tracks
+  - Horizontal scrollable artist cards with circular avatars
+  - Tap artist to view their discography
+- **Multi-Layer Caching System**: Aggressive caching to minimize API calls
+  - Go backend cache: Artist (10 min), Album (10 min), Search (5 min)
+  - Flutter memory cache: Instant navigation for previously viewed artists/albums
+  - Duplicate search prevention: Same query won't trigger new API call
+- **Real-time Download Status**: Track items show live download progress
+  - Queued: Hourglass icon
+  - Downloading: Circular progress with percentage
+  - Completed: Check icon
+  - Works in Home search, Album, and Playlist screens
+- **Downloaded Track Indicator**: Tracks already in history show check mark
+  - Lazy file verification: Only checks file existence when tapped
+  - Auto-removes from history if file was deleted, allowing re-download
+  - Prevents accidental duplicate downloads
+- **Pre-release Support**: GitHub Actions auto-detects preview/beta/rc/alpha tags
+  - Stable users won't receive update notifications for preview versions
+
+### Changed
+
+- **Instant Navigation UX**: Navigate to Artist/Album screens immediately
+  - Header (name, cover) shows instantly from available data
+  - Content (albums/tracks) loads in background inside the screen
+  - Second visit to same artist/album is instant from Flutter cache
+- **Search Results UI Redesign**:
+  - Removed "Download All" button from search results
+  - Added "Songs" section header (matches "Artists" header style)
+  - Track list now in grouped card with rounded corners (like Settings)
+  - Track items with dividers and InkWell ripple effect
+- **Larger UI Elements**: Improved touch targets and visual hierarchy
+  - Recent downloads: Album art 56→100px, section height 80→130px
+  - Artist cards: Avatar 72→88px, container 90→100px
+  - Track items: Album art 48→56px
+- **Optimized Search**: Pressing Enter with same query no longer triggers duplicate search
+- **Smoother Progress Animation**: Progress jumps to 100% after download completes
+  - Embedding (cover, metadata, lyrics) happens in background without blocking UI
+- **Finalizing Status**: Shows "Finalizing" indicator while embedding metadata
+  - Distinct icon (edit_note) with tertiary color
+  - User knows download is complete, just processing metadata
+- **Consistent Download Button Sizes**: All download/status buttons now 44x44px
+- **Better Dynamic Color Contrast**: Improved visibility for cards and chips with dynamic color
+  - Settings cards use overlay colors for better contrast
+  - Theme/view mode chips have visible borders in light mode
+- **Navigation Bar Styling**: Distinct background color from content area
+- **Ask Before Download Default**: Now enabled by default for better UX
+
+### Fixed
+
+- **Artist Profile Images**: Fixed artist images not showing in search results (field name mismatch)
+- **Album Card Overflow**: Fixed 5px overflow in artist discography album cards
+- **Optimized Rebuilds**: Each track item only rebuilds when its own status changes
+  - Uses Riverpod `select()` for granular state watching
+  - Prevents entire list rebuild on progress updates
+- **Update Notification Stuck**: Fixed notification staying at 100% after download complete
+
+## [1.6.3] - 2026-01-03
+
+### Added
+
+- **Predictive Back Navigation**: Support for Android 14+ predictive back gesture with smooth animations
+- **Separate Detail Screens**: Album, Artist, and Playlist now open as dedicated screens with Material Expressive 3 design
+  - Collapsing header with cover art and gradient overlay
+  - Card-based info section with rounded corners (20px radius)
+  - Tonal download buttons with circular shape
+  - Quality picker bottom sheet with drag handle
+- **Double-Tap to Exit**: Press back twice to exit app when at home screen (replaces exit dialog)
+
+### Changed
+
+- **Navigation Architecture**: Refactored from state-based to screen-based navigation
+  - Album/Artist/Playlist URLs navigate to dedicated screens via `Navigator.push()`
+  - Enables native predictive back gesture animations
+  - Search results stay on Home tab for quick downloads
+- **Simplified State Management**: Removed `previousState` chain from TrackProvider since Navigator handles back navigation
+
+## [1.6.2] - 2026-01-02
+
+### Added
+
+- **HTTPS-Only Downloads**: APK downloads and update checks now enforce HTTPS-only connections for security
+
+### Changed
+
+- **Home Tab Rename**: Renamed "Search" tab to "Home" with home icon
+- **Branding**: Changed idle screen title from "Search Music" to "SpotiFLAC"
+- **About Page Redesign**: New Material Expressive 3 grouped layout with app header, contributors section with GitHub avatars, and organized links
+
+### Fixed
+
+- **Play Button Flash**: Fixed play button briefly showing red error icon on app start (now uses optimistic rendering)
+
+### Performance
+
+- **Optimized State Management**: Use `.select()` for Riverpod providers to prevent unnecessary widget rebuilds
+- **List Keys**: Added keys to all list builders for efficient list updates and reordering
+- **Request Cancellation**: Outdated API requests are ignored when new search/fetch is triggered
+- **Debounced URL Fetches**: All network requests now debounced to prevent rapid duplicate calls
+- **Bounded File Cache**: File existence cache now limited to 500 entries to prevent memory leak
+- **Timer Cleanup**: Progress polling timer properly disposed when provider is destroyed
+- **Stream Error Handling**: Share intent stream now has proper error handling
+
+## [1.6.1] - 2026-01-02
+
+### Added
+
+- **Background Download Service**: Downloads now continue running when app is in background
+  - Foreground service with wake lock prevents Android from killing downloads
+  - Persistent notification shows download progress
+  - No more "connection abort" errors when switching apps
+
+### Fixed
+
+- **Share Intent App Restart**: Fixed download queue being lost when sharing from Spotify while downloads are in progress
+  - Download queue is now persisted to storage and automatically restored on app restart
+  - Interrupted downloads (marked as "downloading") are reset to "queued" and auto-resumed
+  - Changed launch mode to `singleTask` to reuse existing activity instead of restarting
+  - Added `onNewIntent` handler to properly receive new share intents
+- **Back Button During Loading**: Back button no longer clears state while loading shared URL
+
+### Changed
+
+- **Kotlin**: Upgraded from 2.2.20 to 2.3.0 for better plugin compatibility
+
+## [1.6.0] - 2026-01-02
+
+### Added
+
+- **Manual Quality Selection**: New option to choose audio quality before each download
+  - Toggle "Ask Before Download" in Download Settings
+  - When enabled, shows quality picker (Lossless, Hi-Res, Hi-Res Max) before downloading
+  - Works for both single track and batch downloads
+- **Live Search**: Search results appear as you type with 400ms debounce
+  - Animated search bar moves from center to top when typing
+  - Keyboard stays open during transition
+  - Back button navigates through search history (album → artist → idle)
+  - Clear button to reset search
+  - URLs still require manual submit
+- **Search Tab Header**: Added collapsing app bar to centered search view for consistent UI across all tabs
+- **Share Audio File**: Share downloaded tracks to other apps from Track Metadata screen
+
+### Fixed
+
+- **Update Checker**: Fixed version comparison for versions with suffix (e.g., `1.5.0-hotfix6`)
+  - Users on hotfix versions now properly receive update notifications
+  - Handles `-hotfix`, `-beta`, `-rc` suffixes correctly
+- **Settings Ripple Effect**: Fixed splash/ripple effect to properly clip within rounded card corners
+
+### Changed
+
+- **Settings UI Redesign**: New Android-style grouped settings with connected cards
+  - Items in same group are connected with rounded card container
+  - Section headers outside cards for clear visual hierarchy
+  - Better contrast with white overlay for dark mode dynamic colors
+- **Larger Tab Titles**: Increased app bar title size (28px) and height (130px) for better visibility
+- **Consistent Header Position**: Fixed Search tab header alignment to match History and Settings tabs
+
+### Improved
+
+- **Code Quality**: Replaced all `print()` statements with structured logging using `logger` package
+- **Dependencies Updated**:
+  - `share_plus`: 10.1.4 → 12.0.1
+  - `flutter_local_notifications`: 18.0.1 → 19.0.0
+  - `build_runner`: 2.4.15 → 2.10.4
+
+## [1.5.5] - 2026-01-02
+
+### Added
+
+- **Share to App**: Share Spotify links directly from Spotify app or browser to SpotiFLAC
+  - Supports track, album, playlist, and artist URLs
+  - Auto-fetches metadata when link is shared
+  - Works with both `open.spotify.com` URLs and `spotify:` URIs
+- **Lyrics Viewer**: View lyrics for downloaded tracks in Track Metadata screen
+  - Fetches lyrics from LRCLIB on-demand
+  - Clean display without timestamps
+  - Copy lyrics to clipboard
+- **Artist URL Support**: Paste artist URL to browse their discography
+  - Shows all albums, singles, and compilations
+  - Horizontal scrollable album cards grouped by type
+  - Tap any album to view and download its tracks
+- **Folder Organization**: Organize downloads into folders by artist or album
+  - Options: None, By Artist, By Album, By Artist & Album
+  - Configurable in Settings > Download
+- **Japanese Lyrics to Romaji**: Auto-convert Hiragana/Katakana lyrics to romaji
+  - Useful for non-Japanese speakers who want to sing along
+  - Toggle in Settings > Options > Lyrics
+  - Kanji characters are preserved (requires dictionary lookup)
+- **History View Mode**: Choose between grid or list view for download history
+  - Grid view shows album art in a 3-column layout (default)
+  - List view shows detailed track info with date
+  - Configurable in Settings > Appearance > Layout
+- **Exit Confirmation**: Dialog prompt when pressing back to exit app (only at root)
+
+### Changed
+
+- **Downloads Tab Renamed to History**: Better reflects the tab's purpose
+  - Shows download queue at top when active
+  - Completed downloads auto-move to history section
+  - Cleaner separation between active downloads and history
+- **Smarter Back Navigation**: Back button now navigates properly
+  - Goes back through search history (album → artist → empty)
+  - Returns to Search tab from other tabs
+  - Only shows exit dialog when truly at root
+
+### Fixed
+
+- **Download Progress**: Fixed progress stuck at 0% when using item-based progress tracking (affected sequential downloads after multi-download feature was added)
+- **Artist View State**: Fixed UI state not clearing properly when switching between artist and album views
+- **Share Intent Timing**: Fixed shared URLs not being processed when app was cold-started from share intent
+
+### Improved
+
+- **Cleaner UI for Returning Users**: Helper text "Supports: Track, Album, Playlist URLs" now only shows for new users and hides after first search
+- **Cleaner Home Tab**: Removed redundant "Recent Downloads" section, renamed to "Search" tab
+- **Centered Search Bar**: Search bar now appears centered on screen when empty, moves to top when results are shown - easier to reach on large phones
+- **Back Navigation**: Android back button now works as expected - returns to previous view (album → artist → empty search)
+
+## [1.5.0-hotfix6] - 2026-01-02
+
+### Fixed
+
+- **App Signing**: Use r0adkll/sign-android-release GitHub Action for reliable signing
+
+## [1.5.0-hotfix5] - 2026-01-02
+
+### Fixed
+
+- **App Signing**: Use key.properties as per Flutter official documentation
+
+## [1.5.0-hotfix4] - 2026-01-02
+
+### Fixed
+
+- **App Signing**: Create keystore.properties in workflow for Gradle
+
+## [1.5.0-hotfix] - 2026-01-02
+
+### Important Notice
+
+We apologize for the inconvenience. Previous releases were signed with different keys, causing "package conflicts" errors when upgrading. Starting from this version, all releases will use a consistent signing key.
+
+**If you're upgrading from v1.5.0 or earlier, please uninstall the app first before installing this version.** This is a one-time requirement. Future updates will work seamlessly without uninstalling.
+
+### Added
+
+- **In-App Update**: Download and install updates directly from the app
+  - Progress bar shows download status
+  - Automatic device architecture detection (arm64/arm32)
+  - Downloads correct APK for your device
+- **Consistent App Signing**: All future releases will use the same signing key
+
+### Fixed
+
+- **Update Checker**: Now downloads APK directly instead of opening browser
+
 ## [1.5.0] - 2026-01-02
 
 ### Added
+
 - **Download Progress Notification**: Shows notification with download progress percentage while downloading
   - Progress bar in notification during download
   - Completion notification when track finishes
@@ -20,8 +771,13 @@
 - **Multi-Progress Tracking for Concurrent Downloads**: Each concurrent download now shows individual progress percentage
   - Previously concurrent downloads jumped from 0% to 100%
   - Now each track shows real-time progress when downloading in parallel
+- **In-App Update**: Download and install updates directly from the app
+  - Progress bar shows download status
+  - Automatic device architecture detection (arm64/arm32)
+  - Downloads correct APK for your device
 
 ### Changed
+
 - **Recent Downloads**: Now shows up to 10 items (was 5) for better scrolling
 - **Queue UI Redesign**: Card-based layout with clearer status indicators
   - Removed global pause/resume in favor of per-item controls
@@ -46,6 +802,7 @@
   - "Add Music" button for quick access
 
 ### Technical
+
 - Added `flutter_local_notifications` package for notifications
 - Added notification permission request in setup screen for Android 13+
 - Enabled core library desugaring for all Android subprojects
@@ -54,6 +811,7 @@
 - Updated platform channel handlers for both Android (Kotlin) and iOS (Swift)
 
 ### Performance
+
 - Optimized SliverAppBar: Removed LayoutBuilder that was called every frame during scroll
 - Optimized image caching: Added `memCacheWidth/Height` to CachedNetworkImage for memory efficiency
 - Optimized state management: Use `select()` to only rebuild when specific state changes
@@ -62,6 +820,7 @@
 ## [1.2.0] - 2026-01-02
 
 ### Added
+
 - **Track Metadata Screen**: New detailed metadata view when tapping on downloaded tracks
   - Material Expressive 3 design with cover art header and gradient
   - Hero animation from list to detail view
@@ -74,12 +833,14 @@
 - **Hi-Res Lossless MAX**: New highest quality option for maximum audio fidelity
 
 ### Fixed
+
 - **Hi-Res Quality Bug**: Fixed issue where Hi-Res downloads were stuck at Lossless quality
   - Users on previous versions are recommended to upgrade to get proper Hi-Res downloads
 - **Settings Navigation Bug**: Fixed issue where changing settings (like audio quality) would navigate back to Home tab
 - **Tidal Badge Color**: Fixed unreadable Tidal service badge (was too bright cyan, now darker blue)
 
 ### Changed
+
 - **Recent Downloads**: Tapping on a track now opens metadata screen instead of playing directly
   - Play button still available for quick playback
 - **Download History Model**: Extended with additional metadata fields (albumArtist, isrc, spotifyId, trackNumber, discNumber, duration, releaseDate, quality)
@@ -88,30 +849,34 @@
 ## [1.1.2] - 2026-01-01
 
 ### Added
+
 - **Update Checker**: Automatic check for new versions from GitHub releases
   - Shows changelog in update dialog
   - Option to disable update notifications
 - **Release Changelog**: GitHub releases now include full changelog
 
 ### Changed
+
 - Updated version to 1.1.2
 
 ## [1.1.1] - 2026-01-01
 
 ### Fixed
+
 - **About Dialog**: Custom About dialog with cleaner layout
 - **Setup Screen**: Fixed step indicator line alignment
 - **Warning Text**: Fixed parallel downloads warning to use Material theme colors
 - **Copyright Year**: Updated to 2026
 
 ### Changed
+
 - Removed Theme Preview from Settings
 - Added MIT License
 
-
 ## [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
@@ -122,15 +887,18 @@
 - **Connection Cleanup**: Automatic cleanup of idle connections every 50 downloads and at queue end
 
 ### 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
+
 - 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
@@ -139,6 +907,7 @@
 - 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

README.md

@@ -1,4 +1,5 @@
 [![GitHub All Releases](https://img.shields.io/github/downloads/zarzet/SpotiFLAC-Mobile/total?style=for-the-badge)](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/cd205e22783a179aab80a2f0cc4445c84e59615a08c11d6e722ab4692c26ac37)
 
 <div align="center">
 
@@ -13,32 +14,43 @@ Get Spotify tracks in true FLAC from Tidal, Qobuz & Amazon Music — no account
 
 ### [Download](https://github.com/zarzet/SpotiFLAC-Mobile/releases)
 
-## Features
-
-- Download tracks, albums, and playlists from Spotify links
-- True lossless FLAC quality from Tidal, Qobuz & Amazon Music
-- Material Expressive 3 design with dynamic colors
-- High performance rendering with Impeller (Vulkan)
-- Concurrent downloads up to 3 simultaneous
-- Real-time download progress tracking
-- Download notifications
-
 ## Screenshots
 
 <p align="center">
-  <img src="assets/images/photo_2026-01-02_02-35-09.jpg" width="200" />
-  <img src="assets/images/photo_2026-01-02_02-35-34.jpg" width="200" />
-  <img src="assets/images/photo_2026-01-02_02-35-37.jpg" width="200" />
-  <img src="assets/images/photo_2026-01-02_02-36-23.jpg" width="200" />
+  <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" />
 </p>
 
+## Metadata Source
+
+SpotiFLAC supports two metadata sources for searching tracks:
+
+| Source | Pros | Cons |
+|--------|------|------|
+| **Deezer** (Default) | No developer account needed, rate limit per user IP | Slightly less comprehensive catalog |
+| **Spotify** | More comprehensive catalog, better search results | Requires developer API credentials to avoid rate limiting |
+
+### Using Spotify
+To use Spotify as your search source without hitting rate limits:
+1. Create a Spotify Developer account at [developer.spotify.com](https://developer.spotify.com)
+2. Create an app to get your Client ID and Client Secret
+3. Go to **Settings > Options > Spotify API > Change from Deezer to Spotify > Input Custom Credentials**
+4. Enter your Client ID and Secret
+5. Change **Search Source** to Spotify
+
 ## Other project
 
 ### [SpotiFLAC (Desktop)](https://github.com/afkarxyz/SpotiFLAC)
 Get Spotify tracks in true FLAC from Tidal, Qobuz & Amazon Music for Windows, macOS & Linux
 
+[![Ko-fi](https://img.shields.io/badge/Ko--fi-Support%20Me-FF5E5B?style=for-the-badge&logo=ko-fi&logoColor=white)](https://ko-fi.com/zarzet)
+
 ## Disclaimer
 
+> **iOS Support**: This app is primarily tested on Android. iOS support is experimental and may have bugs — the developer is too poor to afford an iPhone for proper testing. If you encounter issues on iOS, please report them!
+
 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 Spotify, Tidal, Qobuz, Amazon Music, or any other streaming service.

android/app/build.gradle.kts

@@ -1,3 +1,6 @@
+import java.util.Properties
+import java.io.FileInputStream
+
 plugins {
     id("com.android.application")
     id("kotlin-android")
@@ -5,6 +8,13 @@ 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
@@ -22,16 +32,25 @@ 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 = 34
+        targetSdk = 36
         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")
         }
@@ -39,8 +58,13 @@ android {
 
     buildTypes {
         release {
-            signingConfig = signingConfigs.getByName("debug")
-            // Enable code shrinking and resource shrinking
+            // 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")
+            }
             isMinifyEnabled = true
             isShrinkResources = true
             proguardFiles(
@@ -73,7 +97,10 @@ repositories {
 
 dependencies {
     coreLibraryDesugaring("com.android.tools:desugar_jdk_libs:2.1.4")
-    implementation(files("libs/gobackend.aar"))
+    
+    // Include all AAR and JAR files from libs folder
+    implementation(fileTree(mapOf("dir" to "libs", "include" to listOf("*.jar", "*.aar"))))
+    
     implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.7.3")
     implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.7.0")
 }

android/app/proguard-rules.pro

@@ -6,6 +6,14 @@
 -keep class io.flutter.** { *; }
 -keep class io.flutter.plugins.** { *; }
 
+# 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)
 -keep class gobackend.** { *; }
 -keep class go.** { *; }
@@ -14,6 +22,9 @@
 -keep class com.arthenica.ffmpegkit.** { *; }
 -keep class com.arthenica.smartexception.** { *; }
 
+# Apache Tika (if used by FFmpeg)
+-dontwarn org.apache.tika.**
+
 # Keep native methods
 -keepclasseswithmembernames class * {
     native <methods>;

android/app/src/main/AndroidManifest.xml

@@ -4,26 +4,30 @@
     <!-- Permissions -->
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" 
-        android:maxSdkVersion="28" />
+        android:maxSdkVersion="29" />
     <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:requestLegacyExternalStorage="true"
-        android:usesCleartextTraffic="true">
+        android:usesCleartextTraffic="true"
+        android:enableOnBackInvokedCallback="true">
 
         <activity
             android:name=".MainActivity"
             android:exported="true"
-            android:launchMode="singleTop"
-            android:taskAffinity=""
+            android:launchMode="singleTask"
             android:theme="@style/LaunchTheme"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
             android:hardwareAccelerated="true"
@@ -76,6 +80,17 @@
         <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

@@ -5,83 +5,227 @@ 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 {
-        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 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)
+        }
     }
-
+    
+    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 -> startForegroundService()
-            ACTION_STOP -> stopSelf()
+            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)
+            }
         }
-        return START_NOT_STICKY
+        return START_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 Progress",
+                "Download Service",
                 NotificationManager.IMPORTANCE_LOW
             ).apply {
-                description = "Shows download progress for SpotiFLAC"
+                description = "Shows download progress"
                 setShowBadge(false)
             }
             val manager = getSystemService(NotificationManager::class.java)
             manager.createNotificationChannel(channel)
         }
     }
-
+    
     private fun startForegroundService() {
-        val notification = createNotification("Downloading...", 0)
+        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)
         startForeground(NOTIFICATION_ID, notification)
     }
-
-    fun updateProgress(trackName: String, progress: Int) {
-        val notification = createNotification(trackName, progress)
+    
+    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)
         val manager = getSystemService(NotificationManager::class.java)
         manager.notify(NOTIFICATION_ID, notification)
     }
-
-    private fun createNotification(title: String, progress: Int): Notification {
-        val intent = Intent(this, MainActivity::class.java)
+    
+    private fun buildNotification(progress: Long, total: Long): Notification {
         val pendingIntent = PendingIntent.getActivity(
-            this, 0, intent,
+            this,
+            0,
+            Intent(this, MainActivity::class.java),
             PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE
         )
-
-        val stopIntent = Intent(this, DownloadService::class.java).apply {
-            action = ACTION_STOP
+        
+        val title = if (queueCount > 1) {
+            "Downloading $queueCount tracks"
+        } else if (currentTrackName.isNotEmpty()) {
+            currentTrackName
+        } else {
+            "Downloading..."
         }
-        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)
+        
+        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)
             .setSmallIcon(android.R.drawable.stat_sys_download)
-            .setProgress(100, progress, progress == 0)
-            .setOngoing(true)
             .setContentIntent(pendingIntent)
-            .addAction(android.R.drawable.ic_menu_close_clear_cancel, "Cancel", stopPendingIntent)
-            .build()
+            .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()
     }
 }

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

@@ -1,9 +1,12 @@
 package com.zarz.spotiflac
 
+import android.content.Intent
 import io.flutter.embedding.android.FlutterActivity
 import io.flutter.embedding.engine.FlutterEngine
 import io.flutter.plugin.common.MethodChannel
 import gobackend.Gobackend
+import com.arthenica.ffmpegkit.FFmpegKit
+import com.arthenica.ffmpegkit.ReturnCode
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.SupervisorJob
@@ -12,8 +15,15 @@ import kotlinx.coroutines.withContext
 
 class MainActivity: FlutterActivity() {
     private val CHANNEL = "com.zarz.spotiflac/backend"
+    private val FFMPEG_CHANNEL = "com.zarz.spotiflac/ffmpeg"
     private val scope = CoroutineScope(SupervisorJob() + Dispatchers.Main)
 
+    override fun onNewIntent(intent: Intent) {
+        super.onNewIntent(intent)
+        // Update the intent so receive_sharing_intent can access the new data
+        setIntent(intent)
+    }
+
     override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
         super.configureFlutterEngine(flutterEngine)
         
@@ -43,6 +53,15 @@ class MainActivity: FlutterActivity() {
                             }
                             result.success(response)
                         }
+                        "searchSpotifyAll" -> {
+                            val query = call.argument<String>("query") ?: ""
+                            val trackLimit = call.argument<Int>("track_limit") ?: 15
+                            val artistLimit = call.argument<Int>("artist_limit") ?: 3
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.searchSpotifyAll(query, trackLimit.toLong(), artistLimit.toLong())
+                            }
+                            result.success(response)
+                        }
                         "checkAvailability" -> {
                             val spotifyId = call.argument<String>("spotify_id") ?: ""
                             val isrc = call.argument<String>("isrc") ?: ""
@@ -141,8 +160,9 @@ class MainActivity: FlutterActivity() {
                             val spotifyId = call.argument<String>("spotify_id") ?: ""
                             val trackName = call.argument<String>("track_name") ?: ""
                             val artistName = call.argument<String>("artist_name") ?: ""
+                            val filePath = call.argument<String>("file_path") ?: ""
                             val response = withContext(Dispatchers.IO) {
-                                Gobackend.getLyricsLRC(spotifyId, trackName, artistName)
+                                Gobackend.getLyricsLRC(spotifyId, trackName, artistName, filePath)
                             }
                             result.success(response)
                         }
@@ -160,6 +180,143 @@ class MainActivity: FlutterActivity() {
                             }
                             result.success(null)
                         }
+                        "readFileMetadata" -> {
+                            val filePath = call.argument<String>("file_path") ?: ""
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.readFileMetadata(filePath)
+                            }
+                            result.success(response)
+                        }
+                        "startDownloadService" -> {
+                            val trackName = call.argument<String>("track_name") ?: ""
+                            val artistName = call.argument<String>("artist_name") ?: ""
+                            val queueCount = call.argument<Int>("queue_count") ?: 0
+                            DownloadService.start(this@MainActivity, trackName, artistName, queueCount)
+                            result.success(null)
+                        }
+                        "stopDownloadService" -> {
+                            DownloadService.stop(this@MainActivity)
+                            result.success(null)
+                        }
+                        "updateDownloadServiceProgress" -> {
+                            val trackName = call.argument<String>("track_name") ?: ""
+                            val artistName = call.argument<String>("artist_name") ?: ""
+                            val progress = call.argument<Long>("progress") ?: 0L
+                            val total = call.argument<Long>("total") ?: 0L
+                            val queueCount = call.argument<Int>("queue_count") ?: 0
+                            DownloadService.updateProgress(this@MainActivity, trackName, artistName, progress, total, queueCount)
+                            result.success(null)
+                        }
+                        "isDownloadServiceRunning" -> {
+                            result.success(DownloadService.isServiceRunning())
+                        }
+                        "setSpotifyCredentials" -> {
+                            val clientId = call.argument<String>("client_id") ?: ""
+                            val clientSecret = call.argument<String>("client_secret") ?: ""
+                            withContext(Dispatchers.IO) {
+                                Gobackend.setSpotifyAPICredentials(clientId, clientSecret)
+                            }
+                            result.success(null)
+                        }
+                        "preWarmTrackCache" -> {
+                            val tracksJson = call.argument<String>("tracks") ?: "[]"
+                            withContext(Dispatchers.IO) {
+                                Gobackend.preWarmTrackCacheJSON(tracksJson)
+                            }
+                            result.success(null)
+                        }
+                        "getTrackCacheSize" -> {
+                            val size = withContext(Dispatchers.IO) {
+                                Gobackend.getTrackCacheSize()
+                            }
+                            result.success(size.toInt())
+                        }
+                        "clearTrackCache" -> {
+                            withContext(Dispatchers.IO) {
+                                Gobackend.clearTrackIDCache()
+                            }
+                            result.success(null)
+                        }
+                        // Deezer API methods
+                        "searchDeezerAll" -> {
+                            val query = call.argument<String>("query") ?: ""
+                            val trackLimit = call.argument<Int>("track_limit") ?: 15
+                            val artistLimit = call.argument<Int>("artist_limit") ?: 3
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.searchDeezerAll(query, trackLimit.toLong(), artistLimit.toLong())
+                            }
+                            result.success(response)
+                        }
+                        "getDeezerMetadata" -> {
+                            val resourceType = call.argument<String>("resource_type") ?: ""
+                            val resourceId = call.argument<String>("resource_id") ?: ""
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.getDeezerMetadata(resourceType, resourceId)
+                            }
+                            result.success(response)
+                        }
+                        "parseDeezerUrl" -> {
+                            val url = call.argument<String>("url") ?: ""
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.parseDeezerURLExport(url)
+                            }
+                            result.success(response)
+                        }
+                        "searchDeezerByISRC" -> {
+                            val isrc = call.argument<String>("isrc") ?: ""
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.searchDeezerByISRC(isrc)
+                            }
+                            result.success(response)
+                        }
+                        "convertSpotifyToDeezer" -> {
+                            val resourceType = call.argument<String>("resource_type") ?: ""
+                            val spotifyId = call.argument<String>("spotify_id") ?: ""
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.convertSpotifyToDeezer(resourceType, spotifyId)
+                            }
+                            result.success(response)
+                        }
+                        "getSpotifyMetadataWithFallback" -> {
+                            val url = call.argument<String>("url") ?: ""
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.getSpotifyMetadataWithDeezerFallback(url)
+                            }
+                            result.success(response)
+                        }
+                        // Log methods
+                        "getLogs" -> {
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.getLogs()
+                            }
+                            result.success(response)
+                        }
+                        "getLogsSince" -> {
+                            val index = call.argument<Int>("index") ?: 0
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.getLogsSince(index.toLong())
+                            }
+                            result.success(response)
+                        }
+                        "clearLogs" -> {
+                            withContext(Dispatchers.IO) {
+                                Gobackend.clearLogs()
+                            }
+                            result.success(null)
+                        }
+                        "getLogCount" -> {
+                            val count = withContext(Dispatchers.IO) {
+                                Gobackend.getLogCount()
+                            }
+                            result.success(count.toInt())
+                        }
+                        "setLoggingEnabled" -> {
+                            val enabled = call.argument<Boolean>("enabled") ?: false
+                            withContext(Dispatchers.IO) {
+                                Gobackend.setLoggingEnabled(enabled)
+                            }
+                            result.success(null)
+                        }
                         else -> result.notImplemented()
                     }
                 } catch (e: Exception) {
@@ -167,5 +324,37 @@ class MainActivity: FlutterActivity() {
                 }
             }
         }
+        
+        // FFmpeg method channel
+        MethodChannel(flutterEngine.dartExecutor.binaryMessenger, FFMPEG_CHANNEL).setMethodCallHandler { call, result ->
+            scope.launch {
+                try {
+                    when (call.method) {
+                        "execute" -> {
+                            val command = call.argument<String>("command") ?: ""
+                            val session = withContext(Dispatchers.IO) {
+                                FFmpegKit.execute(command)
+                            }
+                            val returnCode = session.returnCode
+                            val output = session.output ?: ""
+                            result.success(mapOf(
+                                "success" to ReturnCode.isSuccess(returnCode),
+                                "returnCode" to (returnCode?.value ?: -1),
+                                "output" to output
+                            ))
+                        }
+                        "getVersion" -> {
+                            val session = withContext(Dispatchers.IO) {
+                                FFmpegKit.execute("-version")
+                            }
+                            result.success(session.output ?: "unknown")
+                        }
+                        else -> result.notImplemented()
+                    }
+                } catch (e: Exception) {
+                    result.error("FFMPEG_ERROR", e.message, null)
+                }
+            }
+        }
     }
 }

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

@@ -0,0 +1,6 @@
+<?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/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 "2.2.20" apply false
+    id("org.jetbrains.kotlin.android") version "2.3.0" apply false
 }
 
 include(":app")

build_assets/ffmpeg_service_ios.dart

@@ -0,0 +1,208 @@
+import 'dart:io';
+import 'package:ffmpeg_kit_flutter_new_audio/ffmpeg_kit.dart';
+import 'package:ffmpeg_kit_flutter_new_audio/return_code.dart';
+import 'package:spotiflac_android/utils/logger.dart';
+
+final _log = AppLogger('FFmpeg');
+
+/// FFmpeg service for iOS using ffmpeg_kit_flutter plugin
+class FFmpegServiceIOS {
+  /// Execute FFmpeg command and return result
+  static Future<FFmpegResultIOS> _execute(String command) async {
+    try {
+      final session = await FFmpegKit.execute(command);
+      final returnCode = await session.getReturnCode();
+      final output = await session.getOutput() ?? '';
+      return FFmpegResultIOS(
+        success: ReturnCode.isSuccess(returnCode),
+        returnCode: returnCode?.getValue() ?? -1,
+        output: output,
+      );
+    } catch (e) {
+      _log.e('FFmpeg execute error: $e');
+      return FFmpegResultIOS(success: false, returnCode: -1, output: e.toString());
+    }
+  }
+
+  /// Convert M4A (DASH segments) to FLAC
+  static Future<String?> convertM4aToFlac(String inputPath) async {
+    final outputPath = inputPath.replaceAll('.m4a', '.flac');
+    final command = '-i "$inputPath" -c:a flac -compression_level 8 "$outputPath" -y';
+    final result = await _execute(command);
+
+    if (result.success) {
+      try {
+        await File(inputPath).delete();
+      } catch (_) {}
+      return outputPath;
+    }
+
+    _log.e('M4A to FLAC conversion failed: ${result.output}');
+    return null;
+  }
+
+  /// Convert FLAC to MP3
+  static Future<String?> convertFlacToMp3(String inputPath, {String bitrate = '320k'}) async {
+    final dir = File(inputPath).parent.path;
+    final baseName = inputPath.split(Platform.pathSeparator).last.replaceAll('.flac', '');
+    final outputDir = '$dir${Platform.pathSeparator}MP3';
+    await Directory(outputDir).create(recursive: true);
+    final outputPath = '$outputDir${Platform.pathSeparator}$baseName.mp3';
+
+    final command = '-i "$inputPath" -codec:a libmp3lame -b:a $bitrate -map 0:a -map_metadata 0 -id3v2_version 3 "$outputPath" -y';
+    final result = await _execute(command);
+
+    if (result.success) return outputPath;
+    _log.e('FLAC to MP3 conversion failed: ${result.output}');
+    return null;
+  }
+
+  /// Convert FLAC to M4A
+  static Future<String?> convertFlacToM4a(String inputPath, {String codec = 'aac', String bitrate = '256k'}) async {
+    final dir = File(inputPath).parent.path;
+    final baseName = inputPath.split(Platform.pathSeparator).last.replaceAll('.flac', '');
+    final outputDir = '$dir${Platform.pathSeparator}M4A';
+    await Directory(outputDir).create(recursive: true);
+    final outputPath = '$outputDir${Platform.pathSeparator}$baseName.m4a';
+
+    String command;
+    if (codec == 'alac') {
+      command = '-i "$inputPath" -codec:a alac -map 0:a -map_metadata 0 "$outputPath" -y';
+    } else {
+      command = '-i "$inputPath" -codec:a aac -b:a $bitrate -map 0:a -map_metadata 0 "$outputPath" -y';
+    }
+
+    final result = await _execute(command);
+    if (result.success) return outputPath;
+    _log.e('FLAC to M4A conversion failed: ${result.output}');
+    return null;
+  }
+
+  /// Embed cover art to FLAC file
+  static Future<String?> embedCover(String flacPath, String coverPath) async {
+    final tempOutput = '$flacPath.tmp';
+    final command = '-i "$flacPath" -i "$coverPath" -map 0:a -map 1:0 -c copy -metadata:s:v title="Album cover" -metadata:s:v comment="Cover (front)" -disposition:v attached_pic "$tempOutput" -y';
+
+    final result = await _execute(command);
+
+    if (result.success) {
+      try {
+        await File(flacPath).delete();
+        await File(tempOutput).rename(flacPath);
+        return flacPath;
+      } catch (e) {
+        _log.e('Failed to replace file after cover embed: $e');
+        return null;
+      }
+    }
+
+    try {
+      final tempFile = File(tempOutput);
+      if (await tempFile.exists()) await tempFile.delete();
+    } catch (_) {}
+
+    _log.e('Cover embed failed: ${result.output}');
+    return null;
+  }
+
+  /// Embed metadata and cover art to FLAC file
+  /// Returns the file path on success, null on failure
+  static Future<String?> embedMetadata({
+    required String flacPath,
+    String? coverPath,
+    Map<String, String>? metadata,
+  }) async {
+    final tempOutput = '$flacPath.tmp';
+    
+    // Construct command
+    final StringBuffer cmdBuffer = StringBuffer();
+    cmdBuffer.write('-i "$flacPath" ');
+    
+    // Add cover input if available
+    if (coverPath != null) {
+      cmdBuffer.write('-i "$coverPath" ');
+    }
+    
+    // Map audio stream
+    cmdBuffer.write('-map 0:a ');
+    
+    // Map cover stream if available
+    if (coverPath != null) {
+      cmdBuffer.write('-map 1:0 ');
+      cmdBuffer.write('-c:v copy ');
+      cmdBuffer.write('-disposition:v attached_pic ');
+      cmdBuffer.write('-metadata:s:v title="Album cover" ');
+      cmdBuffer.write('-metadata:s:v comment="Cover (front)" ');
+    }
+    
+    // Copy audio codec (don't re-encode)
+    cmdBuffer.write('-c:a copy ');
+    
+    // Add text metadata
+    if (metadata != null) {
+      metadata.forEach((key, value) {
+        // Sanitize value: escape double quotes
+        final sanitizedValue = value.replaceAll('"', '\\"');
+        cmdBuffer.write('-metadata $key="$sanitizedValue" ');
+      });
+    }
+    
+    cmdBuffer.write('"$tempOutput" -y');
+    
+    final command = cmdBuffer.toString();
+    _log.d('Executing FFmpeg command: $command');
+
+    final result = await _execute(command);
+
+    if (result.success) {
+      try {
+        await File(flacPath).delete();
+        await File(tempOutput).rename(flacPath);
+        return flacPath;
+      } catch (e) {
+        _log.e('Failed to replace file after metadata embed: $e');
+        return null;
+      }
+    }
+
+    // Clean up temp file if exists
+    try {
+      final tempFile = File(tempOutput);
+      if (await tempFile.exists()) {
+        await tempFile.delete();
+      }
+    } catch (_) {}
+
+    _log.e('Metadata/Cover embed failed: ${result.output}');
+    return null;
+  }
+
+  /// Check if FFmpeg is available
+  static Future<bool> isAvailable() async {
+    try {
+      final session = await FFmpegKit.execute('-version');
+      final returnCode = await session.getReturnCode();
+      return ReturnCode.isSuccess(returnCode);
+    } catch (e) {
+      return false;
+    }
+  }
+
+  /// Get FFmpeg version info
+  static Future<String?> getVersion() async {
+    try {
+      final session = await FFmpegKit.execute('-version');
+      return await session.getOutput();
+    } catch (e) {
+      return null;
+    }
+  }
+}
+
+class FFmpegResultIOS {
+  final bool success;
+  final int returnCode;
+  final String output;
+
+  FFmpegResultIOS({required this.success, required this.returnCode, required this.output});
+}

devtools_options.yaml

@@ -0,0 +1,3 @@
+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

@@ -1,6 +1,7 @@
 package gobackend
 
 import (
+	"bufio"
 	"encoding/base64"
 	"encoding/json"
 	"fmt"
@@ -10,15 +11,26 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+	"sync"
 	"time"
 )
 
 // AmazonDownloader handles Amazon Music downloads using DoubleDouble service (same as PC)
 type AmazonDownloader struct {
-	client  *http.Client
-	regions []string // us, eu regions for DoubleDouble service
+	client           *http.Client
+	regions          []string  // us, eu regions for DoubleDouble service
+	lastAPICallTime  time.Time // Rate limiting: track last API call
+	apiCallCount     int       // Rate limiting: counter per minute
+	apiCallResetTime time.Time // Rate limiting: reset time
 }
 
+var (
+	// Global Amazon downloader instance for connection reuse
+	globalAmazonDownloader *AmazonDownloader
+	amazonDownloaderOnce   sync.Once
+	amazonRateLimitMu      sync.Mutex // Mutex for rate limiting
+)
+
 // DoubleDoubleSubmitResponse is the response from DoubleDouble submit endpoint
 type DoubleDoubleSubmitResponse struct {
 	Success bool   `json:"success"`
@@ -36,12 +48,114 @@ type DoubleDoubleStatusResponse struct {
 	} `json:"current"`
 }
 
-// NewAmazonDownloader creates a new Amazon downloader using DoubleDouble service
-func NewAmazonDownloader() *AmazonDownloader {
-	return &AmazonDownloader{
-		client:  NewHTTPClientWithTimeout(120 * time.Second), // 120s timeout like PC
-		regions: []string{"us", "eu"},                        // Same regions as PC
+// amazonArtistsMatch checks if the artist names are similar enough
+func amazonArtistsMatch(expectedArtist, foundArtist string) bool {
+	normExpected := strings.ToLower(strings.TrimSpace(expectedArtist))
+	normFound := strings.ToLower(strings.TrimSpace(foundArtist))
+
+	// Exact match
+	if normExpected == normFound {
+		return true
 	}
+
+	// Check if one contains the other
+	if strings.Contains(normExpected, normFound) || strings.Contains(normFound, normExpected) {
+		return true
+	}
+
+	// Check first artist (before comma or feat)
+	expectedFirst := strings.Split(normExpected, ",")[0]
+	expectedFirst = strings.Split(expectedFirst, " feat")[0]
+	expectedFirst = strings.Split(expectedFirst, " ft.")[0]
+	expectedFirst = strings.TrimSpace(expectedFirst)
+
+	foundFirst := strings.Split(normFound, ",")[0]
+	foundFirst = strings.Split(foundFirst, " feat")[0]
+	foundFirst = strings.Split(foundFirst, " ft.")[0]
+	foundFirst = strings.TrimSpace(foundFirst)
+
+	if expectedFirst == foundFirst {
+		return true
+	}
+
+	// Check if first artist is contained in the other
+	if strings.Contains(expectedFirst, foundFirst) || strings.Contains(foundFirst, expectedFirst) {
+		return true
+	}
+
+	// If scripts are different (one is ASCII, one is non-ASCII like Japanese/Chinese/Korean),
+	// assume they're the same artist with different transliteration
+	expectedASCII := amazonIsASCIIString(expectedArtist)
+	foundASCII := amazonIsASCIIString(foundArtist)
+	if expectedASCII != foundASCII {
+		GoLog("[Amazon] Artist names in different scripts, assuming match: '%s' vs '%s'\n", expectedArtist, foundArtist)
+		return true
+	}
+
+	return false
+}
+
+// amazonIsASCIIString checks if a string contains only ASCII characters
+func amazonIsASCIIString(s string) bool {
+	for _, r := range s {
+		if r > 127 {
+			return false
+		}
+	}
+	return true
+}
+
+// NewAmazonDownloader creates a new Amazon downloader (returns singleton for connection reuse)
+func NewAmazonDownloader() *AmazonDownloader {
+	amazonDownloaderOnce.Do(func() {
+		globalAmazonDownloader = &AmazonDownloader{
+			client:           NewHTTPClientWithTimeout(120 * time.Second), // 120s timeout like PC
+			regions:          []string{"us", "eu"},                        // Same regions as PC
+			apiCallResetTime: time.Now(),
+		}
+	})
+	return globalAmazonDownloader
+}
+
+// waitForRateLimit implements rate limiting similar to PC version
+// Max 9 requests per minute with 7 second delay between requests
+func (a *AmazonDownloader) waitForRateLimit() {
+	amazonRateLimitMu.Lock()
+	defer amazonRateLimitMu.Unlock()
+
+	now := time.Now()
+
+	// Reset counter every minute
+	if now.Sub(a.apiCallResetTime) >= time.Minute {
+		a.apiCallCount = 0
+		a.apiCallResetTime = now
+	}
+
+	// If we've hit the limit (9 requests per minute), wait until next minute
+	if a.apiCallCount >= 9 {
+		waitTime := time.Minute - now.Sub(a.apiCallResetTime)
+		if waitTime > 0 {
+			GoLog("[Amazon] Rate limit reached, waiting %v...\n", waitTime.Round(time.Second))
+			time.Sleep(waitTime)
+			a.apiCallCount = 0
+			a.apiCallResetTime = time.Now()
+		}
+	}
+
+	// Add delay between requests (7 seconds like PC version)
+	if !a.lastAPICallTime.IsZero() {
+		timeSinceLastCall := now.Sub(a.lastAPICallTime)
+		minDelay := 7 * time.Second
+		if timeSinceLastCall < minDelay {
+			waitTime := minDelay - timeSinceLastCall
+			GoLog("[Amazon] Rate limiting: waiting %v...\n", waitTime.Round(time.Second))
+			time.Sleep(waitTime)
+		}
+	}
+
+	// Update tracking
+	a.lastAPICallTime = time.Now()
+	a.apiCallCount++
 }
 
 // GetAvailableAPIs returns list of available DoubleDouble regions
@@ -56,7 +170,6 @@ func (a *AmazonDownloader) GetAvailableAPIs() []string {
 	return apis
 }
 
-
 // downloadFromDoubleDoubleService downloads a track using DoubleDouble service (same as PC)
 // This uses submit → poll → download mechanism
 // Internal function - not exported to gomobile
@@ -64,18 +177,21 @@ func (a *AmazonDownloader) downloadFromDoubleDoubleService(amazonURL, outputDir
 	var lastError error
 
 	for _, region := range a.regions {
-		fmt.Printf("[Amazon] Trying region: %s...\n", region)
+		GoLog("[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://
+		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
+		// Step 1: Submit download request with rate limiting
 		encodedURL := url.QueryEscape(amazonURL)
 		submitURL := fmt.Sprintf("%s/dl?url=%s", baseURL, encodedURL)
 
+		// Apply rate limiting before request (like PC version)
+		a.waitForRateLimit()
+
 		req, err := http.NewRequest("GET", submitURL, nil)
 		if err != nil {
 			lastError = fmt.Errorf("failed to create request: %w", err)
@@ -85,15 +201,43 @@ func (a *AmazonDownloader) downloadFromDoubleDoubleService(amazonURL, outputDir
 		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
+
+		// Retry logic for 429 errors (like PC version: 3 retries with 15s wait)
+		var resp *http.Response
+		maxRetries := 3
+		for retry := 0; retry < maxRetries; retry++ {
+			resp, err = a.client.Do(req)
+			if err != nil {
+				lastError = fmt.Errorf("failed to submit request: %w", err)
+				break
+			}
+
+			if resp.StatusCode == 429 { // Too Many Requests
+				resp.Body.Close()
+				if retry < maxRetries-1 {
+					waitTime := 15 * time.Second
+					GoLog("[Amazon] Rate limited (429), waiting %v before retry %d/%d...\n", waitTime, retry+2, maxRetries)
+					time.Sleep(waitTime)
+					continue
+				}
+				lastError = fmt.Errorf("API rate limit exceeded after %d retries", maxRetries)
+				break
+			}
+
+			if resp.StatusCode != 200 {
+				resp.Body.Close()
+				lastError = fmt.Errorf("submit failed with status %d", resp.StatusCode)
+				break
+			}
+
+			// Success - break retry loop
+			break
 		}
 
-		if resp.StatusCode != 200 {
-			resp.Body.Close()
-			lastError = fmt.Errorf("submit failed with status %d", resp.StatusCode)
+		if err != nil || lastError != nil {
+			if resp != nil {
+				resp.Body.Close()
+			}
 			continue
 		}
 
@@ -111,7 +255,7 @@ func (a *AmazonDownloader) downloadFromDoubleDoubleService(amazonURL, outputDir
 		}
 
 		downloadID := submitResp.ID
-		fmt.Printf("[Amazon] Download ID: %s\n", downloadID)
+		GoLog("[Amazon] Download ID: %s\n", downloadID)
 
 		// Step 2: Poll for completion
 		statusURL := fmt.Sprintf("%s/dl/%s", baseURL, downloadID)
@@ -166,7 +310,7 @@ func (a *AmazonDownloader) downloadFromDoubleDoubleService(amazonURL, outputDir
 				trackName := status.Current.Name
 				artist := status.Current.Artist
 
-				fmt.Printf("[Amazon] Downloading: %s - %s\n", artist, trackName)
+				GoLog("[Amazon] Downloading: %s - %s\n", artist, trackName)
 				return fileURL, trackName, artist, nil
 
 			} else if status.Status == "error" {
@@ -200,15 +344,9 @@ func (a *AmazonDownloader) downloadFromDoubleDoubleService(amazonURL, outputDir
 	return "", "", "", fmt.Errorf("all regions failed. Last error: %v", lastError)
 }
 
-
 // DownloadFile downloads a file from URL with User-Agent and progress tracking
 func (a *AmazonDownloader) DownloadFile(downloadURL, outputPath, itemID string) error {
-	// Set current file being downloaded (legacy)
-	SetCurrentFile(filepath.Base(outputPath))
-	SetDownloading(true)
-	defer SetDownloading(false)
-
-	// Initialize item progress if itemID provided
+	// Initialize item progress (required for all downloads)
 	if itemID != "" {
 		StartItemProgress(itemID)
 		defer CompleteItemProgress(itemID)
@@ -231,71 +369,130 @@ func (a *AmazonDownloader) DownloadFile(downloadURL, outputPath, itemID string)
 		return fmt.Errorf("download failed: HTTP %d", resp.StatusCode)
 	}
 
+	expectedSize := resp.ContentLength
 	// Set total bytes if available
-	if resp.ContentLength > 0 {
-		SetBytesTotal(resp.ContentLength)
-		if itemID != "" {
-			SetItemBytesTotal(itemID, resp.ContentLength)
-		}
+	if expectedSize > 0 && itemID != "" {
+		SetItemBytesTotal(itemID, expectedSize)
 	}
 
 	out, err := os.Create(outputPath)
 	if err != nil {
 		return err
 	}
-	defer out.Close()
 
-	// Use appropriate progress writer
-	var bytesWritten int64
+	// Use buffered writer for better performance (256KB buffer)
+	bufWriter := bufio.NewWriterSize(out, 256*1024)
+
+	// Use item progress writer with buffered output
+	var written int64
 	if itemID != "" {
-		pw := NewItemProgressWriter(out, itemID)
-		bytesWritten, err = io.Copy(pw, resp.Body)
+		pw := NewItemProgressWriter(bufWriter, itemID)
+		written, err = io.Copy(pw, resp.Body)
 	} else {
-		pw := NewProgressWriter(out)
-		bytesWritten, err = io.Copy(pw, resp.Body)
-	}
-	if err != nil {
-		return fmt.Errorf("failed to write file: %w", err)
+		// Fallback: direct copy without progress tracking
+		written, err = io.Copy(bufWriter, resp.Body)
 	}
 
-	fmt.Printf("\r[Amazon] Downloaded: %.2f MB (Complete)\n", float64(bytesWritten)/(1024*1024))
+	// Flush buffer before checking for errors
+	flushErr := bufWriter.Flush()
+	closeErr := out.Close()
+
+	// Check for any errors
+	if err != nil {
+		os.Remove(outputPath)
+		return fmt.Errorf("download interrupted: %w", err)
+	}
+	if flushErr != nil {
+		os.Remove(outputPath)
+		return fmt.Errorf("failed to flush buffer: %w", flushErr)
+	}
+	if closeErr != nil {
+		os.Remove(outputPath)
+		return fmt.Errorf("failed to close file: %w", closeErr)
+	}
+
+	// Verify file size if Content-Length was provided
+	if expectedSize > 0 && written != expectedSize {
+		os.Remove(outputPath)
+		return fmt.Errorf("incomplete download: expected %d bytes, got %d bytes", expectedSize, written)
+	}
+
+	fmt.Printf("\r[Amazon] Downloaded: %.2f MB (Complete)\n", float64(written)/(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
+}
+
 // downloadFromAmazon downloads a track using the request parameters
 // Uses DoubleDouble service (same as PC version)
-func downloadFromAmazon(req DownloadRequest) (string, error) {
+func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 	downloader := NewAmazonDownloader()
 
 	// Check for existing file first
 	if existingFile, exists := checkISRCExistsInternal(req.OutputDir, req.ISRC); exists {
-		return "EXISTS:" + existingFile, nil
+		return AmazonDownloadResult{FilePath: "EXISTS:" + existingFile}, nil
 	}
 
 	// Get Amazon URL from SongLink
 	songlink := NewSongLinkClient()
-	availability, err := songlink.CheckTrackAvailability(req.SpotifyID, req.ISRC)
+	var availability *TrackAvailability
+	var err error
+
+	// Check if SpotifyID is actually a Deezer ID (format: "deezer:xxxxx")
+	if strings.HasPrefix(req.SpotifyID, "deezer:") {
+		// Extract Deezer ID and use Deezer-based lookup
+		deezerID := strings.TrimPrefix(req.SpotifyID, "deezer:")
+		GoLog("[Amazon] Using Deezer ID for SongLink lookup: %s\n", deezerID)
+		availability, err = songlink.CheckAvailabilityFromDeezer(deezerID)
+	} else if req.SpotifyID != "" {
+		// Use Spotify ID
+		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 "", fmt.Errorf("failed to check Amazon availability via SongLink: %w", err)
+		return AmazonDownloadResult{}, fmt.Errorf("failed to check Amazon availability via SongLink: %w", err)
 	}
 
 	if !availability.Amazon || availability.AmazonURL == "" {
-		return "", fmt.Errorf("track not available on Amazon Music (SongLink returned no Amazon URL)")
+		return AmazonDownloadResult{}, fmt.Errorf("track not available on Amazon Music (SongLink returned no Amazon URL)")
 	}
 
 	// 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)
+			return AmazonDownloadResult{}, 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)
+		return AmazonDownloadResult{}, fmt.Errorf("failed to get download URL: %w", err)
 	}
 
+	// Verify artist matches
+	if artistName != "" && !amazonArtistsMatch(req.ArtistName, artistName) {
+		GoLog("[Amazon] Artist mismatch: expected '%s', got '%s'. Rejecting.\n", req.ArtistName, artistName)
+		return AmazonDownloadResult{}, fmt.Errorf("artist mismatch: expected '%s', got '%s'", req.ArtistName, artistName)
+	}
+
+	// Log match found
+	GoLog("[Amazon] Match found: '%s' by '%s'\n", trackName, artistName)
+
 	// Build filename using Spotify metadata (more accurate)
 	filename := buildFilenameFromTemplate(req.FilenameFormat, map[string]interface{}{
 		"title":  req.TrackName,
@@ -310,69 +507,144 @@ func downloadFromAmazon(req DownloadRequest) (string, error) {
 
 	// Check if file already exists
 	if fileInfo, statErr := os.Stat(outputPath); statErr == nil && fileInfo.Size() > 0 {
-		return "EXISTS:" + outputPath, nil
+		return AmazonDownloadResult{FilePath: "EXISTS:" + outputPath}, nil
 	}
 
-	// Download file with item ID for progress tracking
+	// 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,
+		)
+	}()
+
+	// Download audio file with item ID for progress tracking
 	if err := downloader.DownloadFile(downloadURL, outputPath, req.ItemID); err != nil {
-		return "", fmt.Errorf("download failed: %w", err)
+		return AmazonDownloadResult{}, fmt.Errorf("download failed: %w", err)
+	}
+
+	// Wait for parallel operations to complete
+	<-parallelDone
+
+	// Set progress to 100% and status to finalizing (before embedding)
+	// This makes the UI show "Finalizing..." while embedding happens
+	if req.ItemID != "" {
+		SetItemProgress(req.ItemID, 1.0, 0, 0)
+		SetItemFinalizing(req.ItemID)
 	}
 
 	// Log track info from DoubleDouble (for debugging)
 	if trackName != "" && artistName != "" {
-		fmt.Printf("[Amazon] DoubleDouble returned: %s - %s\n", artistName, trackName)
+		GoLog("[Amazon] DoubleDouble returned: %s - %s\n", artistName, trackName)
+	}
+
+	// Read existing metadata from downloaded file BEFORE embedding
+	// Amazon/DoubleDouble files often have correct track/disc numbers that we should preserve
+	existingMeta, metaErr := ReadMetadata(outputPath)
+	actualTrackNum := req.TrackNumber
+	actualDiscNum := req.DiscNumber
+
+	if metaErr == nil && existingMeta != nil {
+		// Use file metadata if it has valid track/disc numbers and request doesn't have them
+		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)
+		}
 	}
 
 	// Embed metadata using Spotify data (more accurate than DoubleDouble)
+	// But preserve track/disc numbers from file if they were better
 	metadata := Metadata{
 		Title:       req.TrackName,
 		Artist:      req.ArtistName,
 		Album:       req.AlbumName,
 		AlbumArtist: req.AlbumArtist,
 		Date:        req.ReleaseDate,
-		TrackNumber: req.TrackNumber,
+		TrackNumber: actualTrackNum,
 		TotalTracks: req.TotalTracks,
-		DiscNumber:  req.DiscNumber,
+		DiscNumber:  actualDiscNum,
 		ISRC:        req.ISRC,
 	}
 
-	// Download cover to memory (avoids file permission issues on Android)
+	// Use cover data from parallel fetch
 	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 parallelResult != nil && parallelResult.CoverData != nil {
+		coverData = parallelResult.CoverData
+		GoLog("[Amazon] Using parallel-fetched cover (%d bytes)\n", len(coverData))
 	}
 
 	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")
+	// Embed lyrics from parallel fetch
+	if req.EmbedLyrics && parallelResult != nil && parallelResult.LyricsLRC != "" {
+		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 {
-			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] Lyrics embedded successfully")
 		}
+	} else if req.EmbedLyrics {
+		fmt.Println("[Amazon] No lyrics available from parallel fetch")
 	}
 
 	fmt.Println("[Amazon] ✓ Downloaded successfully from Amazon Music")
-	return outputPath, nil
+
+	// Read actual quality from the downloaded FLAC file
+	// Amazon API doesn't provide quality info, but we can read it from the file itself
+	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)
+	}
+
+	// Read metadata from file AFTER embedding to get accurate values
+	// This ensures we return what's actually in the file
+	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 != "" {
+			// Use date from file if available
+			req.ReleaseDate = finalMeta.Date
+		}
+	}
+
+	// Add to ISRC index for fast duplicate checking
+	AddToISRCIndex(req.OutputDir, req.ISRC, outputPath)
+
+	bitDepth := 0
+	sampleRate := 0
+	if err == nil {
+		bitDepth = quality.BitDepth
+		sampleRate = quality.SampleRate
+	}
+
+	return AmazonDownloadResult{
+		FilePath:    outputPath,
+		BitDepth:    bitDepth,
+		SampleRate:  sampleRate,
+		Title:       req.TrackName,
+		Artist:      req.ArtistName,
+		Album:       req.AlbumName,
+		ReleaseDate: req.ReleaseDate,
+		TrackNumber: actualTrackNum,
+		DiscNumber:  actualDiscNum,
+		ISRC:        req.ISRC,
+	}, nil
 }

go_backend/deezer.go

@@ -0,0 +1,709 @@
+package gobackend
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+	"sync"
+	"time"
+)
+
+const (
+	deezerBaseURL     = "https://api.deezer.com/2.0"
+	deezerSearchURL   = deezerBaseURL + "/search"
+	deezerTrackURL    = deezerBaseURL + "/track/%s"
+	deezerAlbumURL    = deezerBaseURL + "/album/%s"
+	deezerArtistURL   = deezerBaseURL + "/artist/%s"
+	deezerPlaylistURL = deezerBaseURL + "/playlist/%s"
+	
+	deezerCacheTTL = 10 * time.Minute
+	
+	// Parallel ISRC fetching settings
+	deezerMaxParallelISRC = 10 // Max concurrent ISRC fetches
+)
+
+// DeezerClient handles Deezer API interactions (no auth required)
+type DeezerClient struct {
+	httpClient  *http.Client
+	searchCache map[string]*cacheEntry
+	albumCache  map[string]*cacheEntry
+	artistCache map[string]*cacheEntry
+	isrcCache   map[string]string // trackID -> ISRC cache
+	cacheMu     sync.RWMutex
+}
+
+// Singleton instance
+var (
+	deezerClient     *DeezerClient
+	deezerClientOnce sync.Once
+)
+
+// GetDeezerClient returns singleton Deezer client
+func GetDeezerClient() *DeezerClient {
+	deezerClientOnce.Do(func() {
+		deezerClient = &DeezerClient{
+			httpClient:  NewHTTPClientWithTimeout(15 * time.Second),
+			searchCache: make(map[string]*cacheEntry),
+			albumCache:  make(map[string]*cacheEntry),
+			artistCache: make(map[string]*cacheEntry),
+			isrcCache:   make(map[string]string),
+		}
+	})
+	return deezerClient
+}
+
+// Deezer API response types
+type deezerTrack struct {
+	ID             int64  `json:"id"`
+	Title          string `json:"title"`
+	Duration       int    `json:"duration"` // in seconds
+	TrackPosition  int    `json:"track_position"`
+	DiskNumber     int    `json:"disk_number"`
+	ISRC           string `json:"isrc"`
+	Link           string `json:"link"`
+	ReleaseDate    string `json:"release_date"` // Sometimes at track level
+	Artist         deezerArtist `json:"artist"`
+	Album          deezerAlbumSimple `json:"album"`
+	Contributors   []deezerArtist `json:"contributors"`
+}
+
+type deezerArtist struct {
+	ID        int64  `json:"id"`
+	Name      string `json:"name"`
+	Picture   string `json:"picture"`
+	PictureMedium string `json:"picture_medium"`
+	PictureBig    string `json:"picture_big"`
+	PictureXL     string `json:"picture_xl"`
+	NbFan     int    `json:"nb_fan"`
+}
+
+type deezerAlbumSimple struct {
+	ID          int64  `json:"id"`
+	Title       string `json:"title"`
+	Cover       string `json:"cover"`
+	CoverMedium string `json:"cover_medium"`
+	CoverBig    string `json:"cover_big"`
+	CoverXL     string `json:"cover_xl"`
+	ReleaseDate string `json:"release_date"` // Sometimes at album level
+}
+// ... (skip other structs as they are fine/unchanged) ...
+
+// ... (in convertTrack) ...
+func (c *DeezerClient) convertTrack(track deezerTrack) TrackMetadata {
+	artistName := track.Artist.Name
+	if len(track.Contributors) > 0 {
+		names := make([]string, len(track.Contributors))
+		for i, a := range track.Contributors {
+			names[i] = a.Name
+		}
+		artistName = strings.Join(names, ", ")
+	}
+
+	albumImage := track.Album.CoverXL
+	if albumImage == "" {
+		albumImage = track.Album.CoverBig
+	}
+	if albumImage == "" {
+		albumImage = track.Album.CoverMedium
+	}
+	if albumImage == "" {
+		albumImage = track.Album.Cover
+	}
+	
+	// Try to find release date
+	releaseDate := track.ReleaseDate
+	if releaseDate == "" {
+		releaseDate = track.Album.ReleaseDate
+	}
+
+	return TrackMetadata{
+		SpotifyID:   fmt.Sprintf("deezer:%d", track.ID),
+		Artists:     artistName,
+		Name:        track.Title,
+		AlbumName:   track.Album.Title,
+		AlbumArtist: track.Artist.Name,
+		DurationMS:  track.Duration * 1000,
+		Images:      albumImage,
+		ReleaseDate: releaseDate, // Added this
+		TrackNumber: track.TrackPosition,
+		DiscNumber:  track.DiskNumber,
+		ExternalURL: track.Link,
+		ISRC:        track.ISRC,
+	}
+}
+
+type deezerAlbumFull struct {
+	ID          int64  `json:"id"`
+	Title       string `json:"title"`
+	Cover       string `json:"cover"`
+	CoverMedium string `json:"cover_medium"`
+	CoverBig    string `json:"cover_big"`
+	CoverXL     string `json:"cover_xl"`
+	ReleaseDate string `json:"release_date"`
+	NbTracks    int    `json:"nb_tracks"`
+	Artist      deezerArtist `json:"artist"`
+	Contributors []deezerArtist `json:"contributors"`
+	Tracks      struct {
+		Data []deezerTrack `json:"data"`
+	} `json:"tracks"`
+}
+
+type deezerArtistFull struct {
+	ID            int64  `json:"id"`
+	Name          string `json:"name"`
+	Picture       string `json:"picture"`
+	PictureMedium string `json:"picture_medium"`
+	PictureBig    string `json:"picture_big"`
+	PictureXL     string `json:"picture_xl"`
+	NbFan         int    `json:"nb_fan"`
+	NbAlbum       int    `json:"nb_album"`
+}
+
+type deezerPlaylistFull struct {
+	ID          int64  `json:"id"`
+	Title       string `json:"title"`
+	Picture     string `json:"picture"`
+	PictureMedium string `json:"picture_medium"`
+	PictureBig    string `json:"picture_big"`
+	PictureXL     string `json:"picture_xl"`
+	NbTracks    int    `json:"nb_tracks"`
+	Creator     struct {
+		Name string `json:"name"`
+	} `json:"creator"`
+	Tracks      struct {
+		Data []deezerTrack `json:"data"`
+	} `json:"tracks"`
+}
+
+// SearchAll searches for tracks and artists on Deezer
+// NOTE: ISRC is NOT fetched during search for performance - use GetTrackISRC when needed for download
+func (c *DeezerClient) SearchAll(ctx context.Context, query string, trackLimit, artistLimit int) (*SearchAllResult, error) {
+	cacheKey := fmt.Sprintf("deezer: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()
+
+	result := &SearchAllResult{
+		Tracks:  make([]TrackMetadata, 0),
+		Artists: make([]SearchArtistResult, 0),
+	}
+
+	// Search tracks - NO ISRC fetch for performance
+	trackURL := fmt.Sprintf("%s/track?q=%s&limit=%d", deezerSearchURL, url.QueryEscape(query), trackLimit)
+	var trackResp struct {
+		Data []deezerTrack `json:"data"`
+	}
+	if err := c.getJSON(ctx, trackURL, &trackResp); err != nil {
+		return nil, fmt.Errorf("deezer track search failed: %w", err)
+	}
+
+	for _, track := range trackResp.Data {
+		// Convert directly without fetching ISRC - much faster
+		result.Tracks = append(result.Tracks, c.convertTrack(track))
+	}
+
+	// Search artists
+	artistURL := fmt.Sprintf("%s/artist?q=%s&limit=%d", deezerSearchURL, url.QueryEscape(query), artistLimit)
+	var artistResp struct {
+		Data []deezerArtist `json:"data"`
+	}
+	if err := c.getJSON(ctx, artistURL, &artistResp); err == nil {
+		for _, artist := range artistResp.Data {
+			result.Artists = append(result.Artists, SearchArtistResult{
+				ID:         fmt.Sprintf("deezer:%d", artist.ID),
+				Name:       artist.Name,
+				Images:     c.getBestArtistImage(artist),
+				Followers:  artist.NbFan,
+				Popularity: 0,
+			})
+		}
+	}
+
+	// Cache result
+	c.cacheMu.Lock()
+	c.searchCache[cacheKey] = &cacheEntry{
+		data:      result,
+		expiresAt: time.Now().Add(deezerCacheTTL),
+	}
+	c.cacheMu.Unlock()
+
+	return result, nil
+}
+
+// GetTrack fetches a single track by Deezer ID
+func (c *DeezerClient) GetTrack(ctx context.Context, trackID string) (*TrackResponse, error) {
+	trackURL := fmt.Sprintf(deezerTrackURL, trackID)
+	
+	var track deezerTrack
+	if err := c.getJSON(ctx, trackURL, &track); err != nil {
+		return nil, err
+	}
+
+	return &TrackResponse{
+		Track: c.convertTrack(track),
+	}, nil
+}
+
+// GetAlbum fetches album with tracks
+// ISRC is fetched in parallel for better performance
+func (c *DeezerClient) GetAlbum(ctx context.Context, albumID 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()
+
+	albumURL := fmt.Sprintf(deezerAlbumURL, albumID)
+	
+	var album deezerAlbumFull
+	if err := c.getJSON(ctx, albumURL, &album); err != nil {
+		return nil, err
+	}
+
+	albumImage := c.getBestAlbumImage(album)
+	artistName := album.Artist.Name
+	if len(album.Contributors) > 0 {
+		names := make([]string, len(album.Contributors))
+		for i, a := range album.Contributors {
+			names[i] = a.Name
+		}
+		artistName = strings.Join(names, ", ")
+	}
+
+	info := AlbumInfoMetadata{
+		TotalTracks: album.NbTracks,
+		Name:        album.Title,
+		ReleaseDate: album.ReleaseDate,
+		Artists:     artistName,
+		Images:      albumImage,
+	}
+
+	// Fetch ISRCs in parallel
+	isrcMap := c.fetchISRCsParallel(ctx, album.Tracks.Data)
+
+	tracks := make([]AlbumTrackMetadata, 0, len(album.Tracks.Data))
+	for _, track := range album.Tracks.Data {
+		trackIDStr := fmt.Sprintf("%d", track.ID)
+		isrc := isrcMap[trackIDStr]
+
+		tracks = append(tracks, AlbumTrackMetadata{
+			SpotifyID:   fmt.Sprintf("deezer:%d", track.ID),
+			Artists:     track.Artist.Name,
+			Name:        track.Title,
+			AlbumName:   album.Title,
+			AlbumArtist: artistName,
+			DurationMS:  track.Duration * 1000,
+			Images:      albumImage,
+			ReleaseDate: album.ReleaseDate,
+			TrackNumber: track.TrackPosition,
+			TotalTracks: album.NbTracks,
+			DiscNumber:  track.DiskNumber,
+			ExternalURL: track.Link,
+			ISRC:        isrc,
+			AlbumID:     fmt.Sprintf("deezer:%d", album.ID),
+		})
+	}
+
+	result := &AlbumResponsePayload{
+		AlbumInfo: info,
+		TrackList: tracks,
+	}
+
+	c.cacheMu.Lock()
+	c.albumCache[albumID] = &cacheEntry{
+		data:      result,
+		expiresAt: time.Now().Add(deezerCacheTTL),
+	}
+	c.cacheMu.Unlock()
+
+	return result, nil
+}
+
+// GetArtist fetches artist with albums
+func (c *DeezerClient) GetArtist(ctx context.Context, artistID 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()
+
+	// Fetch artist info
+	artistURL := fmt.Sprintf(deezerArtistURL, artistID)
+	var artist deezerArtistFull
+	if err := c.getJSON(ctx, artistURL, &artist); err != nil {
+		return nil, err
+	}
+
+	artistInfo := ArtistInfoMetadata{
+		ID:         fmt.Sprintf("deezer:%d", artist.ID),
+		Name:       artist.Name,
+		Images:     c.getBestArtistImageFull(artist),
+		Followers:  artist.NbFan,
+		Popularity: 0,
+	}
+
+	// Fetch artist albums
+	albumsURL := fmt.Sprintf("%s/albums?limit=100", fmt.Sprintf(deezerArtistURL, artistID))
+	var albumsResp struct {
+		Data []struct {
+			ID          int64  `json:"id"`
+			Title       string `json:"title"`
+			ReleaseDate string `json:"release_date"`
+			NbTracks    int    `json:"nb_tracks"`
+			Cover       string `json:"cover"`
+			CoverMedium string `json:"cover_medium"`
+			CoverBig    string `json:"cover_big"`
+			CoverXL     string `json:"cover_xl"`
+			RecordType  string `json:"record_type"` // album, single, ep, compile
+		} `json:"data"`
+	}
+
+	albums := make([]ArtistAlbumMetadata, 0)
+	if err := c.getJSON(ctx, albumsURL, &albumsResp); err == nil {
+		for _, album := range albumsResp.Data {
+			albumType := album.RecordType
+			if albumType == "compile" {
+				albumType = "compilation"
+			}
+			
+			coverURL := album.CoverXL
+			if coverURL == "" {
+				coverURL = album.CoverBig
+			}
+			if coverURL == "" {
+				coverURL = album.CoverMedium
+			}
+			if coverURL == "" {
+				coverURL = album.Cover
+			}
+
+			albums = append(albums, ArtistAlbumMetadata{
+				ID:          fmt.Sprintf("deezer:%d", album.ID),
+				Name:        album.Title,
+				ReleaseDate: album.ReleaseDate,
+				TotalTracks: album.NbTracks,
+				Images:      coverURL,
+				AlbumType:   albumType,
+				Artists:     artist.Name,
+			})
+		}
+	}
+
+	result := &ArtistResponsePayload{
+		ArtistInfo: artistInfo,
+		Albums:     albums,
+	}
+
+	c.cacheMu.Lock()
+	c.artistCache[artistID] = &cacheEntry{
+		data:      result,
+		expiresAt: time.Now().Add(deezerCacheTTL),
+	}
+	c.cacheMu.Unlock()
+
+	return result, nil
+}
+
+// GetPlaylist fetches playlist with tracks
+// ISRC is fetched in parallel for better performance
+func (c *DeezerClient) GetPlaylist(ctx context.Context, playlistID string) (*PlaylistResponsePayload, error) {
+	playlistURL := fmt.Sprintf(deezerPlaylistURL, playlistID)
+	
+	var playlist deezerPlaylistFull
+	if err := c.getJSON(ctx, playlistURL, &playlist); err != nil {
+		return nil, err
+	}
+
+	playlistImage := playlist.PictureXL
+	if playlistImage == "" {
+		playlistImage = playlist.PictureBig
+	}
+	if playlistImage == "" {
+		playlistImage = playlist.PictureMedium
+	}
+
+	var info PlaylistInfoMetadata
+	info.Tracks.Total = playlist.NbTracks
+	info.Owner.DisplayName = playlist.Creator.Name
+	info.Owner.Name = playlist.Title
+	info.Owner.Images = playlistImage
+
+	// Fetch ISRCs in parallel
+	isrcMap := c.fetchISRCsParallel(ctx, playlist.Tracks.Data)
+
+	tracks := make([]AlbumTrackMetadata, 0, len(playlist.Tracks.Data))
+	for _, track := range playlist.Tracks.Data {
+		albumImage := track.Album.CoverXL
+		if albumImage == "" {
+			albumImage = track.Album.CoverBig
+		}
+		if albumImage == "" {
+			albumImage = track.Album.CoverMedium
+		}
+
+		trackIDStr := fmt.Sprintf("%d", track.ID)
+		isrc := isrcMap[trackIDStr]
+
+		tracks = append(tracks, AlbumTrackMetadata{
+			SpotifyID:   fmt.Sprintf("deezer:%d", track.ID),
+			Artists:     track.Artist.Name,
+			Name:        track.Title,
+			AlbumName:   track.Album.Title,
+			AlbumArtist: track.Artist.Name,
+			DurationMS:  track.Duration * 1000,
+			Images:      albumImage,
+			ReleaseDate: "",
+			TrackNumber: track.TrackPosition,
+			DiscNumber:  track.DiskNumber,
+			ExternalURL: track.Link,
+			ISRC:        isrc,
+			AlbumID:     fmt.Sprintf("deezer:%d", track.Album.ID),
+		})
+	}
+
+	return &PlaylistResponsePayload{
+		PlaylistInfo: info,
+		TrackList:    tracks,
+	}, nil
+}
+
+// SearchByISRC searches for a track by ISRC using direct endpoint
+func (c *DeezerClient) SearchByISRC(ctx context.Context, isrc string) (*TrackMetadata, error) {
+	// Use direct ISRC endpoint (API 2.0)
+	// https://api.deezer.com/2.0/track/isrc:{ISRC}
+	directURL := fmt.Sprintf("%s/track/isrc:%s", deezerBaseURL, isrc)
+	
+	var track deezerTrack
+	if err := c.getJSON(ctx, directURL, &track); err != nil {
+		// Fallback to search if direct endpoint fails
+		searchURL := fmt.Sprintf("%s/track?q=isrc:%s&limit=1", deezerSearchURL, isrc)
+		var resp struct {
+			Data []deezerTrack `json:"data"`
+		}
+		if err := c.getJSON(ctx, searchURL, &resp); err != nil {
+			return nil, err
+		}
+		if len(resp.Data) == 0 {
+			return nil, fmt.Errorf("no track found for ISRC: %s", isrc)
+		}
+		result := c.convertTrack(resp.Data[0])
+		return &result, nil
+	}
+
+	// Check if we got a valid response (ID > 0)
+	if track.ID == 0 {
+		return nil, fmt.Errorf("no track found for ISRC: %s", isrc)
+	}
+
+	result := c.convertTrack(track)
+	return &result, nil
+}
+
+func (c *DeezerClient) fetchFullTrack(ctx context.Context, trackID string) (*deezerTrack, error) {
+	trackURL := fmt.Sprintf(deezerTrackURL, trackID)
+	var track deezerTrack
+	if err := c.getJSON(ctx, trackURL, &track); err != nil {
+		return nil, err
+	}
+	return &track, nil
+}
+
+// fetchISRCsParallel fetches ISRCs for multiple tracks in parallel with caching
+func (c *DeezerClient) fetchISRCsParallel(ctx context.Context, tracks []deezerTrack) map[string]string {
+	result := make(map[string]string)
+	var resultMu sync.Mutex
+	
+	// First, check cache for existing ISRCs
+	var tracksToFetch []deezerTrack
+	c.cacheMu.RLock()
+	for _, track := range tracks {
+		trackIDStr := fmt.Sprintf("%d", track.ID)
+		if isrc, ok := c.isrcCache[trackIDStr]; ok {
+			result[trackIDStr] = isrc
+		} else {
+			tracksToFetch = append(tracksToFetch, track)
+		}
+	}
+	c.cacheMu.RUnlock()
+	
+	if len(tracksToFetch) == 0 {
+		return result
+	}
+	
+	// Use semaphore to limit concurrent requests
+	sem := make(chan struct{}, deezerMaxParallelISRC)
+	var wg sync.WaitGroup
+	
+	for _, track := range tracksToFetch {
+		wg.Add(1)
+		go func(t deezerTrack) {
+			defer wg.Done()
+			
+			// Acquire semaphore
+			select {
+			case sem <- struct{}{}:
+				defer func() { <-sem }()
+			case <-ctx.Done():
+				return
+			}
+			
+			trackIDStr := fmt.Sprintf("%d", t.ID)
+			fullTrack, err := c.fetchFullTrack(ctx, trackIDStr)
+			if err != nil || fullTrack == nil {
+				return
+			}
+			
+			// Store in result and cache
+			resultMu.Lock()
+			result[trackIDStr] = fullTrack.ISRC
+			resultMu.Unlock()
+			
+			c.cacheMu.Lock()
+			c.isrcCache[trackIDStr] = fullTrack.ISRC
+			c.cacheMu.Unlock()
+		}(track)
+	}
+	
+	wg.Wait()
+	return result
+}
+
+// GetTrackISRC fetches ISRC for a single track (with caching)
+// Use this when you need ISRC for download
+func (c *DeezerClient) GetTrackISRC(ctx context.Context, trackID string) (string, error) {
+	// Check cache first
+	c.cacheMu.RLock()
+	if isrc, ok := c.isrcCache[trackID]; ok {
+		c.cacheMu.RUnlock()
+		return isrc, nil
+	}
+	c.cacheMu.RUnlock()
+	
+	// Fetch from API
+	fullTrack, err := c.fetchFullTrack(ctx, trackID)
+	if err != nil {
+		return "", err
+	}
+	
+	// Cache the result
+	c.cacheMu.Lock()
+	c.isrcCache[trackID] = fullTrack.ISRC
+	c.cacheMu.Unlock()
+	
+	return fullTrack.ISRC, nil
+}
+
+
+
+func (c *DeezerClient) getBestArtistImage(artist deezerArtist) string {
+	if artist.PictureXL != "" {
+		return artist.PictureXL
+	}
+	if artist.PictureBig != "" {
+		return artist.PictureBig
+	}
+	if artist.PictureMedium != "" {
+		return artist.PictureMedium
+	}
+	return artist.Picture
+}
+
+func (c *DeezerClient) getBestArtistImageFull(artist deezerArtistFull) string {
+	if artist.PictureXL != "" {
+		return artist.PictureXL
+	}
+	if artist.PictureBig != "" {
+		return artist.PictureBig
+	}
+	if artist.PictureMedium != "" {
+		return artist.PictureMedium
+	}
+	return artist.Picture
+}
+
+func (c *DeezerClient) getBestAlbumImage(album deezerAlbumFull) string {
+	if album.CoverXL != "" {
+		return album.CoverXL
+	}
+	if album.CoverBig != "" {
+		return album.CoverBig
+	}
+	if album.CoverMedium != "" {
+		return album.CoverMedium
+	}
+	return album.Cover
+}
+
+func (c *DeezerClient) getJSON(ctx context.Context, endpoint string, dst interface{}) error {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint, nil)
+	if err != nil {
+		return err
+	}
+
+	req.Header.Set("Accept", "application/json")
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return err
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("deezer API returned status %d: %s", resp.StatusCode, string(body))
+	}
+
+	return json.Unmarshal(body, dst)
+}
+
+// parseDeezerURL is internal function, returns type and ID
+func parseDeezerURL(input string) (string, string, error) {
+	trimmed := strings.TrimSpace(input)
+	if trimmed == "" {
+		return "", "", fmt.Errorf("empty URL")
+	}
+
+	parsed, err := url.Parse(trimmed)
+	if err != nil {
+		return "", "", err
+	}
+
+	if parsed.Host != "www.deezer.com" && parsed.Host != "deezer.com" && parsed.Host != "deezer.page.link" {
+		return "", "", fmt.Errorf("not a Deezer URL")
+	}
+
+	parts := strings.Split(strings.Trim(parsed.Path, "/"), "/")
+	
+	// Skip language prefix if present (e.g., /en/, /fr/)
+	if len(parts) > 0 && len(parts[0]) == 2 {
+		parts = parts[1:]
+	}
+
+	if len(parts) < 2 {
+		return "", "", fmt.Errorf("invalid Deezer URL format")
+	}
+
+	resourceType := parts[0]
+	resourceID := parts[1]
+
+	switch resourceType {
+	case "track", "album", "artist", "playlist":
+		return resourceType, resourceID, nil
+	default:
+		return "", "", fmt.Errorf("unsupported Deezer resource type: %s", resourceType)
+	}
+}

go_backend/duplicate.go

@@ -1,49 +1,144 @@
 package gobackend
 
 import (
+	"encoding/json"
+	"fmt"
 	"os"
 	"path/filepath"
 	"strings"
+	"sync"
+	"time"
 )
 
+// ISRCIndex holds a cached map of ISRC -> file path for fast duplicate checking
+type ISRCIndex struct {
+	index     map[string]string // ISRC (uppercase) -> file path
+	outputDir string
+	buildTime time.Time
+	mu        sync.RWMutex
+}
+
+// Global ISRC index cache (per output directory)
+var (
+	isrcIndexCache   = make(map[string]*ISRCIndex)
+	isrcIndexCacheMu sync.RWMutex
+	isrcIndexTTL     = 5 * time.Minute // Cache TTL - rebuild after 5 minutes
+)
+
+// GetISRCIndex returns or builds an ISRC index for the given directory
+func GetISRCIndex(outputDir string) *ISRCIndex {
+	isrcIndexCacheMu.RLock()
+	idx, exists := isrcIndexCache[outputDir]
+	isrcIndexCacheMu.RUnlock()
+
+	// Return cached index if still valid
+	if exists && time.Since(idx.buildTime) < isrcIndexTTL {
+		return idx
+	}
+
+	// Build new index
+	return buildISRCIndex(outputDir)
+}
+
+// buildISRCIndex scans a directory and builds a map of ISRC -> file path
+// Same implementation as PC version for consistency
+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
+
+	// Walk directory - only check .flac files
+	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
+		}
+
+		// Read ISRC from file
+		metadata, err := ReadMetadata(path)
+		if err != nil || metadata.ISRC == "" {
+			return nil
+		}
+
+		// Store in index (uppercase for case-insensitive matching)
+		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))
+
+	// Cache the index
+	isrcIndexCacheMu.Lock()
+	isrcIndexCache[outputDir] = idx
+	isrcIndexCacheMu.Unlock()
+
+	return idx
+}
+
+// lookup checks if an ISRC exists in the index (internal, returns bool)
+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
+}
+
+// Lookup checks if an ISRC exists in the index (gomobile compatible)
+// Returns filepath if found, empty string if not found
+func (idx *ISRCIndex) Lookup(isrc string) (string, error) {
+	path, _ := idx.lookup(isrc)
+	return path, nil
+}
+
+// Add adds a new ISRC to the index (call after successful download)
+func (idx *ISRCIndex) Add(isrc, filePath string) {
+	if isrc == "" || filePath == "" {
+		return
+	}
+
+	idx.mu.Lock()
+	defer idx.mu.Unlock()
+
+	idx.index[strings.ToUpper(isrc)] = filePath
+}
+
+// InvalidateCache clears the ISRC index cache for a directory
+func InvalidateISRCCache(outputDir string) {
+	isrcIndexCacheMu.Lock()
+	delete(isrcIndexCache, outputDir)
+	isrcIndexCacheMu.Unlock()
+}
+
 // checkISRCExistsInternal checks if a file with the given ISRC exists (internal use)
+// Uses ISRC index for fast lookup
 func checkISRCExistsInternal(outputDir, isrc string) (string, bool) {
 	if isrc == "" || outputDir == "" {
 		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
-	}
-
-	return "", false
+	// Use index for fast lookup
+	idx := GetISRCIndex(outputDir)
+	return idx.lookup(isrc)
 }
 
 // CheckISRCExists is the exported version for gomobile (returns string, error)
@@ -61,3 +156,98 @@ func CheckFileExists(filePath string) bool {
 	}
 	return !info.IsDir() && info.Size() > 0
 }
+
+// FileExistenceResult represents the result of checking if a file exists
+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"`
+}
+
+// CheckFilesExistParallel checks if multiple files exist in parallel
+// It builds an ISRC index from the output directory once, then checks all tracks against it
+// Same implementation as PC version for consistency
+func CheckFilesExistParallel(outputDir string, tracksJSON string) (string, error) {
+	// Parse input JSON
+	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))
+
+	// Build ISRC index from output directory (scan once)
+	isrcIdx := GetISRCIndex(outputDir)
+
+	// Check each track against the index (parallel)
+	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()
+
+	// Return results as JSON
+	resultJSON, err := json.Marshal(results)
+	if err != nil {
+		return "", fmt.Errorf("failed to marshal results: %w", err)
+	}
+
+	return string(resultJSON), nil
+}
+
+// PreBuildISRCIndex pre-builds the ISRC index for a directory
+// Call this when app starts or when entering album/playlist screen
+func PreBuildISRCIndex(outputDir string) error {
+	if outputDir == "" {
+		return fmt.Errorf("output directory is required")
+	}
+
+	buildISRCIndex(outputDir)
+	return nil
+}
+
+// AddToISRCIndex adds a new file to the ISRC index after successful download
+// This avoids rebuilding the entire index
+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/exports.go

@@ -5,6 +5,7 @@ package gobackend
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 	"strings"
 	"time"
 )
@@ -16,37 +17,43 @@ func ParseSpotifyURL(url string) (string, error) {
 	if err != nil {
 		return "", err
 	}
-	
+
 	result := map[string]string{
 		"type": parsed.Type,
 		"id":   parsed.ID,
 	}
-	
+
 	jsonBytes, err := json.Marshal(result)
 	if err != nil {
 		return "", err
 	}
-	
+
 	return string(jsonBytes), nil
 }
 
+// SetSpotifyAPICredentials sets custom Spotify API credentials from Flutter
+// Pass empty strings to use default credentials
+func SetSpotifyAPICredentials(clientID, clientSecret string) {
+	SetSpotifyCredentials(clientID, clientSecret)
+}
+
 // GetSpotifyMetadata fetches metadata from Spotify URL
 // Returns JSON with track/album/playlist data
 func GetSpotifyMetadata(spotifyURL string) (string, error) {
 	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
 	defer cancel()
-	
+
 	client := NewSpotifyMetadataClient()
 	data, err := client.GetFilteredData(ctx, spotifyURL, false, 0)
 	if err != nil {
 		return "", err
 	}
-	
+
 	jsonBytes, err := json.Marshal(data)
 	if err != nil {
 		return "", err
 	}
-	
+
 	return string(jsonBytes), nil
 }
 
@@ -55,18 +62,38 @@ func GetSpotifyMetadata(spotifyURL string) (string, error) {
 func SearchSpotify(query string, limit int) (string, error) {
 	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
 	defer cancel()
-	
+
 	client := NewSpotifyMetadataClient()
 	results, err := client.SearchTracks(ctx, query, limit)
 	if err != nil {
 		return "", err
 	}
-	
+
 	jsonBytes, err := json.Marshal(results)
 	if err != nil {
 		return "", err
 	}
-	
+
+	return string(jsonBytes), nil
+}
+
+// SearchSpotifyAll searches for tracks and artists on Spotify
+// Returns JSON with tracks and artists arrays
+func SearchSpotifyAll(query string, trackLimit, artistLimit int) (string, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
+	defer cancel()
+
+	client := NewSpotifyMetadataClient()
+	results, err := client.SearchAll(ctx, query, trackLimit, artistLimit)
+	if err != nil {
+		return "", err
+	}
+
+	jsonBytes, err := json.Marshal(results)
+	if err != nil {
+		return "", err
+	}
+
 	return string(jsonBytes), nil
 }
 
@@ -78,12 +105,12 @@ func CheckAvailability(spotifyID, isrc string) (string, error) {
 	if err != nil {
 		return "", err
 	}
-	
+
 	jsonBytes, err := json.Marshal(availability)
 	if err != nil {
 		return "", err
 	}
-	
+
 	return string(jsonBytes), nil
 }
 
@@ -106,7 +133,8 @@ type DownloadRequest struct {
 	DiscNumber           int    `json:"disc_number"`
 	TotalTracks          int    `json:"total_tracks"`
 	ReleaseDate          string `json:"release_date"`
-	ItemID               string `json:"item_id"` // Unique ID for progress tracking
+	ItemID               string `json:"item_id"`     // Unique ID for progress tracking
+	DurationMS           int    `json:"duration_ms"` // Expected duration in milliseconds (for verification)
 }
 
 // DownloadResponse represents the result of a download
@@ -115,7 +143,34 @@ type DownloadResponse struct {
 	Message       string `json:"message"`
 	FilePath      string `json:"file_path,omitempty"`
 	Error         string `json:"error,omitempty"`
+	ErrorType     string `json:"error_type,omitempty"` // "not_found", "rate_limit", "network", "unknown"
 	AlreadyExists bool   `json:"already_exists,omitempty"`
+	// Actual quality info from the source
+	ActualBitDepth   int    `json:"actual_bit_depth,omitempty"`
+	ActualSampleRate int    `json:"actual_sample_rate,omitempty"`
+	Service          string `json:"service,omitempty"` // Actual service used (for fallback)
+	Title            string `json:"title,omitempty"`
+	Artist           string `json:"artist,omitempty"`
+	Album            string `json:"album,omitempty"`
+	ReleaseDate      string `json:"release_date,omitempty"`
+	TrackNumber      int    `json:"track_number,omitempty"`
+	DiscNumber       int    `json:"disc_number,omitempty"`
+	ISRC             string `json:"isrc,omitempty"`
+}
+
+// DownloadResult is a generic result type for all downloaders
+// DownloadResult is a generic result type for all downloaders
+type DownloadResult struct {
+	FilePath    string
+	BitDepth    int
+	SampleRate  int
+	Title       string
+	Artist      string
+	Album       string
+	ReleaseDate string
+	TrackNumber int
+	DiscNumber  int
+	ISRC        string
 }
 
 // DownloadTrack downloads a track from the specified service
@@ -126,50 +181,132 @@ func DownloadTrack(requestJSON string) (string, error) {
 	if err := json.Unmarshal([]byte(requestJSON), &req); err != nil {
 		return errorResponse("Invalid request: " + err.Error())
 	}
-	
+
 	// Trim whitespace from string fields to prevent filename/path issues
 	req.TrackName = strings.TrimSpace(req.TrackName)
 	req.ArtistName = strings.TrimSpace(req.ArtistName)
 	req.AlbumName = strings.TrimSpace(req.AlbumName)
 	req.AlbumArtist = strings.TrimSpace(req.AlbumArtist)
 	req.OutputDir = strings.TrimSpace(req.OutputDir)
-	
-	var filePath string
+
+	var result DownloadResult
 	var err error
-	
+
 	switch req.Service {
 	case "tidal":
-		filePath, err = downloadFromTidal(req)
+		tidalResult, tidalErr := downloadFromTidal(req)
+		if tidalErr == nil {
+			result = DownloadResult{
+				FilePath:    tidalResult.FilePath,
+				BitDepth:    tidalResult.BitDepth,
+				SampleRate:  tidalResult.SampleRate,
+				Title:       tidalResult.Title,
+				Artist:      tidalResult.Artist,
+				Album:       tidalResult.Album,
+				ReleaseDate: tidalResult.ReleaseDate,
+				TrackNumber: tidalResult.TrackNumber,
+				DiscNumber:  tidalResult.DiscNumber,
+				ISRC:        tidalResult.ISRC,
+			}
+		}
+		err = tidalErr
 	case "qobuz":
-		filePath, err = downloadFromQobuz(req)
+		qobuzResult, qobuzErr := downloadFromQobuz(req)
+		if qobuzErr == nil {
+			result = DownloadResult{
+				FilePath:    qobuzResult.FilePath,
+				BitDepth:    qobuzResult.BitDepth,
+				SampleRate:  qobuzResult.SampleRate,
+				Title:       qobuzResult.Title,
+				Artist:      qobuzResult.Artist,
+				Album:       qobuzResult.Album,
+				ReleaseDate: qobuzResult.ReleaseDate,
+				TrackNumber: qobuzResult.TrackNumber,
+				DiscNumber:  qobuzResult.DiscNumber,
+				ISRC:        qobuzResult.ISRC,
+			}
+		}
+		err = qobuzErr
 	case "amazon":
-		filePath, err = downloadFromAmazon(req)
+		amazonResult, amazonErr := downloadFromAmazon(req)
+		if amazonErr == nil {
+			result = DownloadResult{
+				FilePath:    amazonResult.FilePath,
+				BitDepth:    amazonResult.BitDepth,
+				SampleRate:  amazonResult.SampleRate,
+				Title:       amazonResult.Title,
+				Artist:      amazonResult.Artist,
+				Album:       amazonResult.Album,
+				ReleaseDate: amazonResult.ReleaseDate,
+				TrackNumber: amazonResult.TrackNumber,
+				DiscNumber:  amazonResult.DiscNumber,
+				ISRC:        amazonResult.ISRC,
+			}
+		}
+		err = amazonErr
 	default:
 		return errorResponse("Unknown service: " + req.Service)
 	}
-	
+
 	if err != nil {
 		return errorResponse(err.Error())
 	}
-	
+
 	// Check if file already exists
-	if len(filePath) > 7 && filePath[:7] == "EXISTS:" {
+	if len(result.FilePath) > 7 && result.FilePath[:7] == "EXISTS:" {
+		actualPath := result.FilePath[7:]
+		// Read actual quality from existing file
+		quality, qErr := GetAudioQuality(actualPath)
+		if qErr == nil {
+			result.BitDepth = quality.BitDepth
+			result.SampleRate = quality.SampleRate
+		}
 		resp := DownloadResponse{
-			Success:       true,
-			Message:       "File already exists",
-			FilePath:      filePath[7:],
-			AlreadyExists: true,
+			Success:          true,
+			Message:          "File already exists",
+			FilePath:         actualPath,
+			AlreadyExists:    true,
+			ActualBitDepth:   result.BitDepth,
+			ActualSampleRate: result.SampleRate,
+			Service:          req.Service,
+			Title:            result.Title,
+			Artist:           result.Artist,
+			Album:            result.Album,
+			ReleaseDate:      result.ReleaseDate,
+			TrackNumber:      result.TrackNumber,
+			DiscNumber:       result.DiscNumber,
+			ISRC:             result.ISRC,
 		}
 		jsonBytes, _ := json.Marshal(resp)
 		return string(jsonBytes), nil
 	}
-	
-	resp := DownloadResponse{
-		Success:  true,
-		Message:  "Download complete",
-		FilePath: filePath,
+
+	// Read actual quality from downloaded file (more accurate than API)
+	quality, qErr := GetAudioQuality(result.FilePath)
+	if qErr == nil {
+		result.BitDepth = quality.BitDepth
+		result.SampleRate = quality.SampleRate
+		GoLog("[Download] Actual quality from file: %d-bit/%dHz\n", quality.BitDepth, quality.SampleRate)
+	} else {
+		GoLog("[Download] Could not read quality from file: %v\n", qErr)
 	}
-	
+
+	resp := DownloadResponse{
+		Success:          true,
+		Message:          "Download complete",
+		FilePath:         result.FilePath,
+		ActualBitDepth:   result.BitDepth,
+		ActualSampleRate: result.SampleRate,
+		Service:          req.Service,
+		Title:            result.Title,
+		Artist:           result.Artist,
+		Album:            result.Album,
+		ReleaseDate:      result.ReleaseDate,
+		TrackNumber:      result.TrackNumber,
+		DiscNumber:       result.DiscNumber,
+		ISRC:             result.ISRC,
+	}
+
 	jsonBytes, _ := json.Marshal(resp)
 	return string(jsonBytes), nil
 }
@@ -181,21 +318,23 @@ func DownloadWithFallback(requestJSON string) (string, error) {
 	if err := json.Unmarshal([]byte(requestJSON), &req); err != nil {
 		return errorResponse("Invalid request: " + err.Error())
 	}
-	
+
 	// Trim whitespace from string fields to prevent filename/path issues
 	req.TrackName = strings.TrimSpace(req.TrackName)
 	req.ArtistName = strings.TrimSpace(req.ArtistName)
 	req.AlbumName = strings.TrimSpace(req.AlbumName)
 	req.AlbumArtist = strings.TrimSpace(req.AlbumArtist)
 	req.OutputDir = strings.TrimSpace(req.OutputDir)
-	
+
 	// Build service order starting with preferred service
 	allServices := []string{"tidal", "qobuz", "amazon"}
 	preferredService := req.Service
 	if preferredService == "" {
 		preferredService = "tidal"
 	}
-	
+
+	GoLog("[DownloadWithFallback] Preferred service from request: '%s'\n", req.Service)
+
 	// Create ordered list: preferred first, then others
 	services := []string{preferredService}
 	for _, s := range allServices {
@@ -203,49 +342,140 @@ func DownloadWithFallback(requestJSON string) (string, error) {
 			services = append(services, s)
 		}
 	}
-	
+
+	GoLog("[DownloadWithFallback] Service order: %v\n", services)
+
 	var lastErr error
-	
+
 	for _, service := range services {
+		GoLog("[DownloadWithFallback] Trying service: %s\n", service)
 		req.Service = service
-		
-		var filePath string
+
+		var result DownloadResult
 		var err error
-		
+
 		switch service {
 		case "tidal":
-			filePath, err = downloadFromTidal(req)
+			tidalResult, tidalErr := downloadFromTidal(req)
+			if tidalErr == nil {
+				result = DownloadResult{
+					FilePath:    tidalResult.FilePath,
+					BitDepth:    tidalResult.BitDepth,
+					SampleRate:  tidalResult.SampleRate,
+					Title:       tidalResult.Title,
+					Artist:      tidalResult.Artist,
+					Album:       tidalResult.Album,
+					ReleaseDate: tidalResult.ReleaseDate,
+					TrackNumber: tidalResult.TrackNumber,
+					DiscNumber:  tidalResult.DiscNumber,
+					ISRC:        tidalResult.ISRC,
+				}
+			} else {
+				GoLog("[DownloadWithFallback] Tidal error: %v\n", tidalErr)
+			}
+			err = tidalErr
 		case "qobuz":
-			filePath, err = downloadFromQobuz(req)
+			qobuzResult, qobuzErr := downloadFromQobuz(req)
+			if qobuzErr == nil {
+				result = DownloadResult{
+					FilePath:    qobuzResult.FilePath,
+					BitDepth:    qobuzResult.BitDepth,
+					SampleRate:  qobuzResult.SampleRate,
+					Title:       qobuzResult.Title,
+					Artist:      qobuzResult.Artist,
+					Album:       qobuzResult.Album,
+					ReleaseDate: qobuzResult.ReleaseDate,
+					TrackNumber: qobuzResult.TrackNumber,
+					DiscNumber:  qobuzResult.DiscNumber,
+					ISRC:        qobuzResult.ISRC,
+				}
+			} else {
+				GoLog("[DownloadWithFallback] Qobuz error: %v\n", qobuzErr)
+			}
+			err = qobuzErr
 		case "amazon":
-			filePath, err = downloadFromAmazon(req)
+			amazonResult, amazonErr := downloadFromAmazon(req)
+			if amazonErr == nil {
+				result = DownloadResult{
+					FilePath:    amazonResult.FilePath,
+					BitDepth:    amazonResult.BitDepth,
+					SampleRate:  amazonResult.SampleRate,
+					Title:       amazonResult.Title,
+					Artist:      amazonResult.Artist,
+					Album:       amazonResult.Album,
+					ReleaseDate: amazonResult.ReleaseDate,
+					TrackNumber: amazonResult.TrackNumber,
+					DiscNumber:  amazonResult.DiscNumber,
+					ISRC:        amazonResult.ISRC,
+				}
+			} else {
+				GoLog("[DownloadWithFallback] Amazon error: %v\n", amazonErr)
+			}
+			err = amazonErr
 		}
-		
+
 		if err == nil {
 			// Check if file already exists
-			if len(filePath) > 7 && filePath[:7] == "EXISTS:" {
+			if len(result.FilePath) > 7 && result.FilePath[:7] == "EXISTS:" {
+				actualPath := result.FilePath[7:]
+				// Read actual quality from existing file
+				quality, qErr := GetAudioQuality(actualPath)
+				if qErr == nil {
+					result.BitDepth = quality.BitDepth
+					result.SampleRate = quality.SampleRate
+				}
 				resp := DownloadResponse{
-					Success:       true,
-					Message:       "File already exists",
-					FilePath:      filePath[7:],
-					AlreadyExists: true,
+					Success:          true,
+					Message:          "File already exists",
+					FilePath:         actualPath,
+					AlreadyExists:    true,
+					ActualBitDepth:   result.BitDepth,
+					ActualSampleRate: result.SampleRate,
+					Service:          service,
+					Title:            result.Title,
+					Artist:           result.Artist,
+					Album:            result.Album,
+					ReleaseDate:      result.ReleaseDate,
+					TrackNumber:      result.TrackNumber,
+					DiscNumber:       result.DiscNumber,
+					ISRC:             result.ISRC,
 				}
 				jsonBytes, _ := json.Marshal(resp)
 				return string(jsonBytes), nil
 			}
-			
+
+			// Read actual quality from downloaded file (more accurate than API)
+			quality, qErr := GetAudioQuality(result.FilePath)
+			if qErr == nil {
+				result.BitDepth = quality.BitDepth
+				result.SampleRate = quality.SampleRate
+				GoLog("[Download] Actual quality from file: %d-bit/%dHz\n", quality.BitDepth, quality.SampleRate)
+			} else {
+				GoLog("[Download] Could not read quality from file: %v\n", qErr)
+			}
+
 			resp := DownloadResponse{
-				Success:  true,
-				Message:  "Downloaded from " + service,
-				FilePath: filePath,
+				Success:          true,
+				Message:          "Downloaded from " + service,
+				FilePath:         result.FilePath,
+				ActualBitDepth:   result.BitDepth,
+				ActualSampleRate: result.SampleRate,
+				Service:          service,
+				Title:            result.Title,
+				Artist:           result.Artist,
+				Album:            result.Album,
+				ReleaseDate:      result.ReleaseDate,
+				TrackNumber:      result.TrackNumber,
+				DiscNumber:       result.DiscNumber,
+				ISRC:             result.ISRC,
 			}
 			jsonBytes, _ := json.Marshal(resp)
 			return string(jsonBytes), nil
 		}
-		
+
 		lastErr = err
 	}
-	
+
 	return errorResponse("All services failed. Last error: " + lastErr.Error())
 }
 
@@ -283,6 +513,44 @@ func CleanupConnections() {
 	CloseIdleConnections()
 }
 
+// ReadFileMetadata reads metadata directly from a FLAC file
+// Returns JSON with all embedded metadata (title, artist, album, track number, etc.)
+// This is useful for displaying accurate metadata in the UI without relying on cached data
+func ReadFileMetadata(filePath string) (string, error) {
+	metadata, err := ReadMetadata(filePath)
+	if err != nil {
+		return "", fmt.Errorf("failed to read metadata: %w", err)
+	}
+
+	// Also get audio quality info
+	quality, qualityErr := GetAudioQuality(filePath)
+
+	result := map[string]interface{}{
+		"title":        metadata.Title,
+		"artist":       metadata.Artist,
+		"album":        metadata.Album,
+		"album_artist": metadata.AlbumArtist,
+		"date":         metadata.Date,
+		"track_number": metadata.TrackNumber,
+		"disc_number":  metadata.DiscNumber,
+		"isrc":         metadata.ISRC,
+		"lyrics":       metadata.Lyrics,
+	}
+
+	// Add quality info if available
+	if qualityErr == nil {
+		result["bit_depth"] = quality.BitDepth
+		result["sample_rate"] = quality.SampleRate
+	}
+
+	jsonBytes, err := json.Marshal(result)
+	if err != nil {
+		return "", err
+	}
+
+	return string(jsonBytes), nil
+}
+
 // SetDownloadDirectory sets the default download directory
 func SetDownloadDirectory(path string) error {
 	return setDownloadDir(path)
@@ -291,27 +559,47 @@ func SetDownloadDirectory(path string) error {
 // CheckDuplicate checks if a file with the given ISRC exists
 func CheckDuplicate(outputDir, isrc string) (string, error) {
 	existingFile, exists := CheckISRCExists(outputDir, isrc)
-	
+
 	result := map[string]interface{}{
 		"exists":   exists,
 		"filepath": existingFile,
 	}
-	
+
 	jsonBytes, err := json.Marshal(result)
 	if err != nil {
 		return "", err
 	}
-	
+
 	return string(jsonBytes), nil
 }
 
+// CheckDuplicatesBatch checks multiple files for duplicates in parallel
+// Uses ISRC index for fast lookup (builds index once, checks all tracks)
+// tracksJSON format: [{"isrc": "...", "track_name": "...", "artist_name": "..."}, ...]
+// Returns JSON array of results
+func CheckDuplicatesBatch(outputDir, tracksJSON string) (string, error) {
+	return CheckFilesExistParallel(outputDir, tracksJSON)
+}
+
+// PreBuildDuplicateIndex pre-builds the ISRC index for a directory
+// Call this when entering album/playlist screen for faster duplicate checking
+func PreBuildDuplicateIndex(outputDir string) error {
+	return PreBuildISRCIndex(outputDir)
+}
+
+// InvalidateDuplicateIndex clears the ISRC index cache for a directory
+// Call this when files are deleted or moved
+func InvalidateDuplicateIndex(outputDir string) {
+	InvalidateISRCCache(outputDir)
+}
+
 // BuildFilename builds a filename from template and metadata
 func BuildFilename(template string, metadataJSON string) (string, error) {
 	var metadata map[string]interface{}
 	if err := json.Unmarshal([]byte(metadataJSON), &metadata); err != nil {
 		return "", err
 	}
-	
+
 	filename := buildFilenameFromTemplate(template, metadata)
 	return filename, nil
 }
@@ -345,15 +633,26 @@ func FetchLyrics(spotifyID, trackName, artistName string) (string, error) {
 	return string(jsonBytes), nil
 }
 
-// GetLyricsLRC fetches lyrics and converts to LRC format string
-func GetLyricsLRC(spotifyID, trackName, artistName string) (string, error) {
+// GetLyricsLRC fetches lyrics and converts to LRC format string with metadata headers
+// First tries to extract from file, then falls back to fetching from internet
+func GetLyricsLRC(spotifyID, trackName, artistName string, filePath string) (string, error) {
+	// Try to extract from file first (much faster)
+	if filePath != "" {
+		lyrics, err := ExtractLyrics(filePath)
+		if err == nil && lyrics != "" {
+			return lyrics, nil
+		}
+	}
+
+	// Fallback to fetching from internet
 	client := NewLyricsClient()
-	lyrics, err := client.FetchLyricsAllSources(spotifyID, trackName, artistName)
+	lyricsData, err := client.FetchLyricsAllSources(spotifyID, trackName, artistName)
 	if err != nil {
 		return "", err
 	}
 
-	lrcContent := convertToLRC(lyrics)
+	// Convert to LRC format with metadata headers (like PC version)
+	lrcContent := convertToLRCWithMetadata(lyricsData, trackName, artistName)
 	return lrcContent, nil
 }
 
@@ -373,10 +672,339 @@ func EmbedLyricsToFile(filePath, lyrics string) (string, error) {
 	return string(jsonBytes), nil
 }
 
+// PreWarmTrackCacheJSON pre-warms the track ID cache for album/playlist tracks
+// tracksJSON is a JSON array of objects with: isrc, track_name, artist_name, spotify_id, service
+// This runs in background and returns immediately
+func PreWarmTrackCacheJSON(tracksJSON string) (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 errorResponse("Invalid JSON: " + err.Error())
+	}
+
+	// Convert to PreWarmCacheRequest
+	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,
+		}
+	}
+
+	// Run in background
+	go PreWarmTrackCache(requests)
+
+	resp := map[string]interface{}{
+		"success": true,
+		"message": fmt.Sprintf("Pre-warming cache for %d tracks in background", len(tracks)),
+	}
+
+	jsonBytes, _ := json.Marshal(resp)
+	return string(jsonBytes), nil
+}
+
+// GetTrackCacheSize returns the current track ID cache size
+func GetTrackCacheSize() int {
+	return GetCacheSize()
+}
+
+// ClearTrackIDCache clears the track ID cache
+func ClearTrackIDCache() {
+	ClearTrackCache()
+}
+
+// ==================== DEEZER API ====================
+
+// SearchDeezerAll searches for tracks and artists on Deezer (no API key required)
+// Returns JSON with tracks and artists arrays
+func SearchDeezerAll(query string, trackLimit, artistLimit int) (string, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
+	defer cancel()
+
+	client := GetDeezerClient()
+	results, err := client.SearchAll(ctx, query, trackLimit, artistLimit)
+	if err != nil {
+		return "", err
+	}
+
+	jsonBytes, err := json.Marshal(results)
+	if err != nil {
+		return "", err
+	}
+
+	return string(jsonBytes), nil
+}
+
+// GetDeezerMetadata fetches metadata from Deezer URL or ID
+// resourceType: track, album, artist, playlist
+// resourceID: Deezer ID
+func GetDeezerMetadata(resourceType, resourceID string) (string, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	client := GetDeezerClient()
+	var data interface{}
+	var err error
+
+	switch resourceType {
+	case "track":
+		data, err = client.GetTrack(ctx, resourceID)
+	case "album":
+		data, err = client.GetAlbum(ctx, resourceID)
+	case "artist":
+		data, err = client.GetArtist(ctx, resourceID)
+	case "playlist":
+		data, err = client.GetPlaylist(ctx, resourceID)
+	default:
+		return "", fmt.Errorf("unsupported Deezer resource type: %s", resourceType)
+	}
+
+	if err != nil {
+		return "", err
+	}
+
+	jsonBytes, err := json.Marshal(data)
+	if err != nil {
+		return "", err
+	}
+
+	return string(jsonBytes), nil
+}
+
+// ParseDeezerURLExport parses a Deezer URL and returns type and ID
+func ParseDeezerURLExport(url string) (string, error) {
+	resourceType, resourceID, err := parseDeezerURL(url)
+	if err != nil {
+		return "", err
+	}
+
+	result := map[string]string{
+		"type": resourceType,
+		"id":   resourceID,
+	}
+
+	jsonBytes, err := json.Marshal(result)
+	if err != nil {
+		return "", err
+	}
+
+	return string(jsonBytes), nil
+}
+
+// SearchDeezerByISRC searches for a track by ISRC on Deezer
+func SearchDeezerByISRC(isrc string) (string, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	client := GetDeezerClient()
+	track, err := client.SearchByISRC(ctx, isrc)
+	if err != nil {
+		return "", err
+	}
+
+	jsonBytes, err := json.Marshal(track)
+	if err != nil {
+		return "", err
+	}
+
+	return string(jsonBytes), nil
+}
+
+// ConvertSpotifyToDeezer converts a Spotify track/album ID to Deezer and fetches metadata
+// This uses SongLink API to find the Deezer equivalent, then fetches from Deezer
+// Useful when Spotify API is rate limited
+func ConvertSpotifyToDeezer(resourceType, spotifyID string) (string, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	songlink := NewSongLinkClient()
+	deezerClient := GetDeezerClient()
+
+	// For tracks, we can use SongLink to get Deezer ID
+	if resourceType == "track" {
+		deezerID, err := songlink.GetDeezerIDFromSpotify(spotifyID)
+		if err != nil {
+			return "", fmt.Errorf("could not find Deezer equivalent: %w", err)
+		}
+
+		// Fetch metadata from Deezer
+		trackResp, err := deezerClient.GetTrack(ctx, deezerID)
+		if err != nil {
+			return "", fmt.Errorf("failed to fetch Deezer metadata: %w", err)
+		}
+
+		jsonBytes, err := json.Marshal(trackResp)
+		if err != nil {
+			return "", err
+		}
+
+		return string(jsonBytes), nil
+	}
+
+	// For albums, SongLink also provides mapping
+	if resourceType == "album" {
+		deezerID, err := songlink.GetDeezerAlbumIDFromSpotify(spotifyID)
+		if err != nil {
+			return "", fmt.Errorf("could not find Deezer album: %w", err)
+		}
+
+		// Fetch album metadata from Deezer
+		albumResp, err := deezerClient.GetAlbum(ctx, deezerID)
+		if err != nil {
+			return "", fmt.Errorf("failed to fetch Deezer album metadata: %w", err)
+		}
+
+		jsonBytes, err := json.Marshal(albumResp)
+		if err != nil {
+			return "", err
+		}
+
+		return string(jsonBytes), nil
+	}
+
+	// For artists/playlists, SongLink doesn't provide direct mapping
+	return "", fmt.Errorf("Spotify to Deezer conversion only supported for tracks and albums. Please search by name for %s", resourceType)
+}
+
+// GetSpotifyMetadataWithDeezerFallback tries Spotify first, falls back to Deezer on rate limit
+func GetSpotifyMetadataWithDeezerFallback(spotifyURL string) (string, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	// Try Spotify first
+	client := NewSpotifyMetadataClient()
+	data, err := client.GetFilteredData(ctx, spotifyURL, false, 0)
+	if err == nil {
+		jsonBytes, err := json.Marshal(data)
+		if err != nil {
+			return "", err
+		}
+		return string(jsonBytes), nil
+	}
+
+	// Check if it's a rate limit error
+	errStr := strings.ToLower(err.Error())
+	if !strings.Contains(errStr, "429") && !strings.Contains(errStr, "rate") && !strings.Contains(errStr, "limit") {
+		// Not a rate limit error, return original error
+		return "", err
+	}
+
+	// Rate limited - try Deezer fallback for tracks and albums
+	parsed, parseErr := parseSpotifyURI(spotifyURL)
+	if parseErr != nil {
+		return "", fmt.Errorf("spotify rate limited and failed to parse URL: %w", parseErr)
+	}
+
+	GoLog("[Fallback] Spotify rate limited for %s, trying Deezer...\n", parsed.Type)
+
+	if parsed.Type == "track" || parsed.Type == "album" {
+		// Convert to Deezer
+		return ConvertSpotifyToDeezer(parsed.Type, parsed.ID)
+	}
+
+	// Artist and playlist not supported for fallback
+	if parsed.Type == "artist" {
+		return "", fmt.Errorf("spotify rate limited. Artist pages require Spotify API - please try again later")
+	}
+
+	return "", fmt.Errorf("spotify rate limited. Playlists are user-specific and require Spotify API")
+}
+
+// ==================== SONGLINK DEEZER SUPPORT ====================
+
+// CheckAvailabilityFromDeezerID checks track availability using Deezer track ID as source
+// Returns JSON with availability info for Spotify, Tidal, Amazon, etc.
+func CheckAvailabilityFromDeezerID(deezerTrackID string) (string, error) {
+	client := NewSongLinkClient()
+	availability, err := client.CheckAvailabilityFromDeezer(deezerTrackID)
+	if err != nil {
+		return "", err
+	}
+
+	jsonBytes, err := json.Marshal(availability)
+	if err != nil {
+		return "", err
+	}
+
+	return string(jsonBytes), nil
+}
+
+// CheckAvailabilityByPlatformID checks track availability using any platform as source
+// platform: "spotify", "deezer", "tidal", "amazonMusic", "appleMusic", "youtube"
+// entityType: "song" or "album"
+// entityID: the ID on that platform
+func CheckAvailabilityByPlatformID(platform, entityType, entityID string) (string, error) {
+	client := NewSongLinkClient()
+	availability, err := client.CheckAvailabilityByPlatform(platform, entityType, entityID)
+	if err != nil {
+		return "", err
+	}
+
+	jsonBytes, err := json.Marshal(availability)
+	if err != nil {
+		return "", err
+	}
+
+	return string(jsonBytes), nil
+}
+
+// GetSpotifyIDFromDeezerTrack converts a Deezer track ID to Spotify track ID
+func GetSpotifyIDFromDeezerTrack(deezerTrackID string) (string, error) {
+	client := NewSongLinkClient()
+	return client.GetSpotifyIDFromDeezer(deezerTrackID)
+}
+
+// GetTidalURLFromDeezerTrack converts a Deezer track ID to Tidal URL
+func GetTidalURLFromDeezerTrack(deezerTrackID string) (string, error) {
+	client := NewSongLinkClient()
+	return client.GetTidalURLFromDeezer(deezerTrackID)
+}
+
+// GetAmazonURLFromDeezerTrack converts a Deezer track ID to Amazon Music URL
+func GetAmazonURLFromDeezerTrack(deezerTrackID string) (string, error) {
+	client := NewSongLinkClient()
+	return client.GetAmazonURLFromDeezer(deezerTrackID)
+}
+
 func errorResponse(msg string) (string, error) {
+	// Determine error type based on message
+	errorType := "unknown"
+	lowerMsg := strings.ToLower(msg)
+
+	if strings.Contains(lowerMsg, "isp blocking") || 
+		strings.Contains(lowerMsg, "try using vpn") ||
+		strings.Contains(lowerMsg, "change dns") {
+		errorType = "isp_blocked"
+	} else if strings.Contains(lowerMsg, "not found") ||
+		strings.Contains(lowerMsg, "not available") ||
+		strings.Contains(lowerMsg, "no results") ||
+		strings.Contains(lowerMsg, "track not found") ||
+		strings.Contains(lowerMsg, "all services failed") {
+		errorType = "not_found"
+	} else if strings.Contains(lowerMsg, "rate limit") ||
+		strings.Contains(lowerMsg, "429") ||
+		strings.Contains(lowerMsg, "too many requests") {
+		errorType = "rate_limit"
+	} else if strings.Contains(lowerMsg, "network") ||
+		strings.Contains(lowerMsg, "connection") ||
+		strings.Contains(lowerMsg, "timeout") ||
+		strings.Contains(lowerMsg, "dial") {
+		errorType = "network"
+	}
+
 	resp := DownloadResponse{
-		Success: false,
-		Error:   msg,
+		Success:   false,
+		Error:     msg,
+		ErrorType: errorType,
 	}
 	jsonBytes, _ := json.Marshal(resp)
 	return string(jsonBytes), nil

go_backend/httputil.go

@@ -1,36 +1,75 @@
 package gobackend
 
 import (
+	"crypto/tls"
+	"errors"
 	"fmt"
 	"io"
 	"math/rand"
 	"net"
 	"net/http"
+	"net/url"
 	"strconv"
+	"strings"
+	"syscall"
 	"time"
 )
 
 // HTTP utility functions for consistent request handling across all downloaders
 
-// 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 Windows Chrome User-Agent string
+// Uses same format as PC version (referensi/backend/spotify_metadata.go) for better API compatibility
+func getRandomUserAgent() string {
+	// Windows 10/11 Chrome format - same as PC version for maximum compatibility
+	// Some APIs may block mobile User-Agents, so we use desktop format
+	winMajor := rand.Intn(2) + 10  // Windows 10 or 11
+	
+	chromeVersion := rand.Intn(25) + 100 // Chrome 100-124
+	chromeBuild := rand.Intn(1500) + 3000 // Build 3000-4500
+	chromePatch := rand.Intn(65) + 60 // Patch 60-125
+	
+	return fmt.Sprintf(
+		"Mozilla/5.0 (Windows NT %d.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/%d.0.%d.%d Safari/537.36",
+		winMajor,
+		chromeVersion,
+		chromeBuild,
+		chromePatch,
+	)
 }
 
-// getRandomUserAgent generates a random browser-like User-Agent string (Android Chrome format)
-func getRandomUserAgent() string {
-	template := userAgentTemplates[rand.Intn(len(userAgentTemplates))]
+// getRandomMacUserAgent generates a random Mac Chrome User-Agent string
+// Alternative format matching referensi/backend/spotify_metadata.go exactly
+func getRandomMacUserAgent() string {
+	macMajor := rand.Intn(4) + 11  // macOS 11-14
+	macMinor := rand.Intn(5) + 4   // Minor 4-8
+	webkitMajor := rand.Intn(7) + 530
+	webkitMinor := rand.Intn(7) + 30
+	chromeMajor := rand.Intn(25) + 80
+	chromeBuild := rand.Intn(1500) + 3000
+	chromePatch := rand.Intn(65) + 60
+	safariMajor := rand.Intn(7) + 530
+	safariMinor := rand.Intn(6) + 30
 
-	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(
+		"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,
+		chromeMajor,
+		chromeBuild,
+		chromePatch,
+		safariMajor,
+		safariMinor,
+	)
+}
 
-	return fmt.Sprintf(template, androidVersion, deviceModel, chromeVersion, chromeBuild, chromePatch)
+// getRandomDesktopUserAgent randomly picks between Windows and Mac User-Agent
+func getRandomDesktopUserAgent() string {
+	if rand.Intn(2) == 0 {
+		return getRandomUserAgent() // Windows
+	}
+	return getRandomMacUserAgent() // Mac
 }
 
 // Default timeout values
@@ -43,6 +82,7 @@ const (
 )
 
 // Shared transport with connection pooling to prevent TCP exhaustion
+// Optimized for large file downloads (FLAC ~30-50MB)
 var sharedTransport = &http.Transport{
 	DialContext: (&net.Dialer{
 		Timeout:   30 * time.Second,
@@ -56,6 +96,9 @@ var sharedTransport = &http.Transport{
 	ExpectContinueTimeout: 1 * time.Second,
 	DisableKeepAlives:     false, // Enable keep-alives for connection reuse
 	ForceAttemptHTTP2:     true,
+	WriteBufferSize:       64 * 1024,  // 64KB write buffer
+	ReadBufferSize:        64 * 1024,  // 64KB read buffer
+	DisableCompression:    true,       // FLAC is already compressed
 }
 
 // Shared HTTP client for general requests (reuses connections)
@@ -96,9 +139,15 @@ func CloseIdleConnections() {
 }
 
 // DoRequestWithUserAgent executes an HTTP request with a random User-Agent header
+// Also checks for ISP blocking on errors
 func DoRequestWithUserAgent(client *http.Client, req *http.Request) (*http.Response, error) {
 	req.Header.Set("User-Agent", getRandomUserAgent())
-	return client.Do(req)
+	resp, err := client.Do(req)
+	if err != nil {
+		// Check for ISP blocking
+		CheckAndLogISPBlocking(err, req.URL.String(), "HTTP")
+	}
+	return resp, err
 }
 
 // RetryConfig holds configuration for retry logic
@@ -121,9 +170,11 @@ func DefaultRetryConfig() RetryConfig {
 
 // DoRequestWithRetry executes an HTTP request with retry logic and exponential backoff
 // Handles 429 (Too Many Requests) responses with Retry-After header
+// Also detects and logs ISP blocking
 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)
@@ -133,7 +184,16 @@ func DoRequestWithRetry(client *http.Client, req *http.Request, config RetryConf
 		resp, err := client.Do(reqCopy)
 		if err != nil {
 			lastErr = err
+			
+			// Check for ISP blocking on network errors
+			if CheckAndLogISPBlocking(err, requestURL, "HTTP") {
+				// Don't retry if ISP blocking is detected - it won't help
+				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)
 			}
@@ -154,17 +214,43 @@ 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)
 			}
@@ -258,3 +344,172 @@ func BuildErrorMessage(apiURL string, statusCode int, responsePreview string) st
 	}
 	return msg
 }
+
+// ISPBlockingError represents an error caused by ISP blocking
+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)
+}
+
+// IsISPBlocking checks if an error is likely caused by ISP blocking
+// Returns the ISPBlockingError if detected, nil otherwise
+func IsISPBlocking(err error, requestURL string) *ISPBlockingError {
+	if err == nil {
+		return nil
+	}
+
+	// Extract domain from URL
+	domain := extractDomain(requestURL)
+	errStr := strings.ToLower(err.Error())
+
+	// Check for DNS resolution failure (common ISP blocking method)
+	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,
+			}
+		}
+	}
+
+	// Check for connection refused (ISP firewall blocking)
+	var opErr *net.OpError
+	if errors.As(err, &opErr) {
+		if opErr.Op == "dial" {
+			// Check for specific syscall errors
+			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,
+					}
+				}
+			}
+		}
+	}
+
+	// Check for TLS handshake failure (ISP MITM or blocking HTTPS)
+	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
+}
+
+// CheckAndLogISPBlocking checks for ISP blocking and logs if detected
+// 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 {
+		// Try to extract domain manually
+		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"
+}
+
+// WrapErrorWithISPCheck wraps an error with ISP blocking detection
+// 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/logbuffer.go

@@ -0,0 +1,203 @@
+package gobackend
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+	"sync"
+	"time"
+)
+
+// LogEntry represents a single log entry
+type LogEntry struct {
+	Timestamp string `json:"timestamp"`
+	Level     string `json:"level"`
+	Tag       string `json:"tag"`
+	Message   string `json:"message"`
+}
+
+// LogBuffer stores logs in a circular buffer for retrieval by Flutter
+type LogBuffer struct {
+	entries        []LogEntry
+	maxSize        int
+	mu             sync.RWMutex
+	loggingEnabled bool // Whether logging is enabled (controlled by Flutter)
+}
+
+var (
+	globalLogBuffer *LogBuffer
+	logBufferOnce   sync.Once
+)
+
+// GetLogBuffer returns the singleton log buffer instance
+func GetLogBuffer() *LogBuffer {
+	logBufferOnce.Do(func() {
+		globalLogBuffer = &LogBuffer{
+			entries:        make([]LogEntry, 0, 500),
+			maxSize:        500,
+			loggingEnabled: false, // Default: disabled for performance
+		}
+	})
+	return globalLogBuffer
+}
+
+// SetLoggingEnabled enables or disables logging
+func (lb *LogBuffer) SetLoggingEnabled(enabled bool) {
+	lb.mu.Lock()
+	defer lb.mu.Unlock()
+	lb.loggingEnabled = enabled
+}
+
+// IsLoggingEnabled returns whether logging is enabled
+func (lb *LogBuffer) IsLoggingEnabled() bool {
+	lb.mu.RLock()
+	defer lb.mu.RUnlock()
+	return lb.loggingEnabled
+}
+
+// Add adds a log entry to the buffer
+func (lb *LogBuffer) Add(level, tag, message string) {
+	lb.mu.Lock()
+	defer lb.mu.Unlock()
+
+	// Skip if logging is disabled (except for errors which are always logged)
+	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 {
+		// Remove oldest entry
+		lb.entries = lb.entries[1:]
+	}
+	lb.entries = append(lb.entries, entry)
+
+	// Also print to logcat for debugging
+	fmt.Printf("[%s] %s\n", tag, message)
+}
+
+// GetAll returns all log entries as JSON
+func (lb *LogBuffer) GetAll() string {
+	lb.mu.RLock()
+	defer lb.mu.RUnlock()
+
+	jsonBytes, _ := json.Marshal(lb.entries)
+	return string(jsonBytes)
+}
+
+// getSince returns log entries since the given index (internal use)
+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)
+}
+
+// Clear clears all log entries
+func (lb *LogBuffer) Clear() {
+	lb.mu.Lock()
+	defer lb.mu.Unlock()
+	lb.entries = lb.entries[:0]
+}
+
+// Count returns the number of log entries
+func (lb *LogBuffer) Count() int {
+	lb.mu.RLock()
+	defer lb.mu.RUnlock()
+	return len(lb.entries)
+}
+
+// Helper functions for logging with different levels
+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") || strings.HasPrefix(message, "✗") {
+		level = "ERROR"
+	} else if strings.Contains(msgLower, "warning") || strings.Contains(msgLower, "warn") {
+		level = "WARN"
+	} else if strings.HasPrefix(message, "✓") || 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)
+}
+
+// Exported functions for Flutter
+
+// GetLogs returns all logs as JSON array
+func GetLogs() string {
+	return GetLogBuffer().GetAll()
+}
+
+// GetLogsSince returns logs since the given index
+// Returns JSON: {"logs": [...], "next_index": N}
+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
+}
+
+// ClearLogs clears all logs
+func ClearLogs() {
+	GetLogBuffer().Clear()
+}
+
+// GetLogCount returns the number of log entries
+func GetLogCount() int {
+	return GetLogBuffer().Count()
+}
+
+// SetLoggingEnabled enables or disables logging from Flutter
+func SetLoggingEnabled(enabled bool) {
+	GetLogBuffer().SetLoggingEnabled(enabled)
+}

go_backend/lyrics.go

@@ -248,6 +248,8 @@ func msToLRCTimestamp(ms int64) string {
 	return fmt.Sprintf("[%02d:%02d.%02d]", minutes, seconds, centiseconds)
 }
 
+// convertToLRC converts lyrics to LRC format string (without metadata headers)
+// Use convertToLRCWithMetadata for full LRC with headers
 func convertToLRC(lyrics *LyricsResponse) string {
 	if lyrics == nil || len(lyrics.Lines) == 0 {
 		return ""
@@ -272,6 +274,45 @@ func convertToLRC(lyrics *LyricsResponse) string {
 	return builder.String()
 }
 
+// convertToLRCWithMetadata converts lyrics to LRC format with metadata headers
+// Includes [ti:], [ar:], [by:] headers
+func convertToLRCWithMetadata(lyrics *LyricsResponse, trackName, artistName string) string {
+	if lyrics == nil || len(lyrics.Lines) == 0 {
+		return ""
+	}
+
+	var builder strings.Builder
+
+	// Add metadata headers
+	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")
+
+	// Add lyrics lines
+	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)
+			builder.WriteString("\n")
+		}
+	} else {
+		for _, line := range lyrics.Lines {
+			if line.Words == "" {
+				continue
+			}
+			builder.WriteString(line.Words)
+			builder.WriteString("\n")
+		}
+	}
+
+	return builder.String()
+}
+
 func simplifyTrackName(name string) string {
 	patterns := []string{
 		`\s*\(feat\..*?\)`,

go_backend/metadata.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"os"
 	"strconv"
+	"strings"
 
 	"github.com/go-flac/flacpicture"
 	"github.com/go-flac/flacvorbis"
@@ -256,11 +257,30 @@ func ReadMetadata(filePath string) (*Metadata, error) {
 			if trackNum != "" {
 				fmt.Sscanf(trackNum, "%d", &metadata.TrackNumber)
 			}
+			// Also try lowercase variant (some encoders use lowercase)
+			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)
 			}
+			// Also try DISC variant
+			if metadata.DiscNumber == 0 {
+				discNum = getComment(cmt, "DISC")
+				if discNum != "" {
+					fmt.Sscanf(discNum, "%d", &metadata.DiscNumber)
+				}
+			}
+			
+			// Try DATE variants
+			if metadata.Date == "" {
+				metadata.Date = getComment(cmt, "YEAR")
+			}
 
 			break
 		}
@@ -273,10 +293,16 @@ func setComment(cmt *flacvorbis.MetaDataBlockVorbisComment, key, value string) {
 	if value == "" {
 		return
 	}
-	// Remove existing
+	// Remove existing (case-insensitive comparison for Vorbis comments)
+	keyUpper := strings.ToUpper(key)
 	for i := len(cmt.Comments) - 1; i >= 0; i-- {
-		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:]...)
+		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:]...)
+			}
 		}
 	}
 	// Add new
@@ -284,9 +310,14 @@ func setComment(cmt *flacvorbis.MetaDataBlockVorbisComment, key, value string) {
 }
 
 func getComment(cmt *flacvorbis.MetaDataBlockVorbisComment, key string) string {
+	keyUpper := strings.ToUpper(key) + "="
 	for _, comment := range cmt.Comments {
-		if len(comment) > len(key)+1 && comment[:len(key)+1] == key+"=" {
-			return comment[len(key)+1:]
+		if len(comment) > len(key) {
+			// Case-insensitive comparison for Vorbis comments
+			commentUpper := strings.ToUpper(comment[:len(key)+1])
+			if commentUpper == keyUpper {
+				return comment[len(key)+1:]
+			}
 		}
 	}
 	return ""
@@ -335,3 +366,449 @@ func EmbedLyrics(filePath string, lyrics string) error {
 
 	return f.Save(filePath)
 }
+
+// ExtractLyrics extracts embedded lyrics from a FLAC file
+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
+			}
+			
+			// Try LYRICS tag first
+			lyrics, err := cmt.Get("LYRICS")
+			if err == nil && len(lyrics) > 0 && lyrics[0] != "" {
+				return lyrics[0], nil
+			}
+			
+			// Fallback to UNSYNCEDLYRICS
+			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")
+}
+
+// AudioQuality represents audio quality info from a FLAC file
+type AudioQuality struct {
+	BitDepth   int `json:"bit_depth"`
+	SampleRate int `json:"sample_rate"`
+}
+
+// GetAudioQuality reads bit depth and sample rate from a FLAC file's StreamInfo block
+// FLAC StreamInfo is always the first metadata block after the 4-byte "fLaC" marker
+// For M4A files, it delegates to GetM4AQuality
+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()
+
+	// Read first 4 bytes to detect file type
+	marker := make([]byte, 4)
+	if _, err := file.Read(marker); err != nil {
+		return AudioQuality{}, fmt.Errorf("failed to read marker: %w", err)
+	}
+	
+	// Check if it's a FLAC file
+	if string(marker) == "fLaC" {
+		// Continue reading FLAC metadata
+		// Read metadata block header (4 bytes)
+		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")
+		}
+
+		// Read STREAMINFO block (34 bytes minimum)
+		streamInfo := make([]byte, 34)
+		if _, err := file.Read(streamInfo); err != nil {
+			return AudioQuality{}, fmt.Errorf("failed to read STREAMINFO: %w", err)
+		}
+
+		// Parse sample rate (20 bits starting at byte 10)
+		sampleRate := (int(streamInfo[10]) << 12) | (int(streamInfo[11]) << 4) | (int(streamInfo[12]) >> 4)
+
+		// Parse bits per sample (5 bits)
+		bitsPerSample := ((int(streamInfo[12]) & 0x01) << 4) | (int(streamInfo[13]) >> 4) + 1
+
+		return AudioQuality{
+			BitDepth:   bitsPerSample,
+			SampleRate: sampleRate,
+		}, nil
+	}
+	
+	// Check if it's an M4A/MP4 file (starts with size + "ftyp")
+	// First 4 bytes are size, next 4 should be "ftyp"
+	file.Seek(0, 0) // Reset to beginning
+	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" {
+		// It's an M4A/MP4 file, use M4A quality reader
+		file.Close() // Close before calling GetM4AQuality which opens the file again
+		return GetM4AQuality(filePath)
+	}
+	
+	return AudioQuality{}, fmt.Errorf("unsupported file format (not FLAC or M4A)")
+}
+
+
+// ========================================
+// M4A (MP4/AAC) Metadata Embedding
+// ========================================
+
+// EmbedM4AMetadata embeds metadata into an M4A file using iTunes-style atoms
+// This is a simplified implementation that writes metadata to the file
+func EmbedM4AMetadata(filePath string, metadata Metadata, coverData []byte) error {
+	// Read the entire file
+	data, err := os.ReadFile(filePath)
+	if err != nil {
+		return fmt.Errorf("failed to read M4A file: %w", err)
+	}
+
+	// Find moov atom position
+	moovPos := findAtom(data, "moov", 0)
+	if moovPos < 0 {
+		return fmt.Errorf("moov atom not found in M4A file")
+	}
+
+	// Find udta atom inside moov, or create one
+	moovSize := int(data[moovPos]<<24 | data[moovPos+1]<<16 | data[moovPos+2]<<8 | data[moovPos+3])
+	udtaPos := findAtom(data, "udta", moovPos+8)
+	
+	// Build new metadata atoms
+	metaAtom := buildMetaAtom(metadata, coverData)
+	
+	var newData []byte
+	if udtaPos >= 0 && udtaPos < moovPos+moovSize {
+		// udta exists, find meta inside it or replace
+		udtaSize := int(data[udtaPos]<<24 | data[udtaPos+1]<<16 | data[udtaPos+2]<<8 | data[udtaPos+3])
+		metaPos := findAtom(data, "meta", udtaPos+8)
+		
+		if metaPos >= 0 && metaPos < udtaPos+udtaSize {
+			// Replace existing meta atom
+			metaSize := int(data[metaPos]<<24 | data[metaPos+1]<<16 | data[metaPos+2]<<8 | data[metaPos+3])
+			newData = append(newData, data[:metaPos]...)
+			newData = append(newData, metaAtom...)
+			newData = append(newData, data[metaPos+metaSize:]...)
+		} else {
+			// Add meta atom to udta
+			newUdtaContent := append(data[udtaPos+8:udtaPos+udtaSize], metaAtom...)
+			newUdtaSize := 8 + len(newUdtaContent)
+			newUdta := make([]byte, 4)
+			newUdta[0] = byte(newUdtaSize >> 24)
+			newUdta[1] = byte(newUdtaSize >> 16)
+			newUdta[2] = byte(newUdtaSize >> 8)
+			newUdta[3] = byte(newUdtaSize)
+			newUdta = append(newUdta, []byte("udta")...)
+			newUdta = append(newUdta, newUdtaContent...)
+			
+			newData = append(newData, data[:udtaPos]...)
+			newData = append(newData, newUdta...)
+			newData = append(newData, data[udtaPos+udtaSize:]...)
+		}
+	} else {
+		// Create new udta with meta
+		udtaContent := metaAtom
+		udtaSize := 8 + len(udtaContent)
+		newUdta := make([]byte, 4)
+		newUdta[0] = byte(udtaSize >> 24)
+		newUdta[1] = byte(udtaSize >> 16)
+		newUdta[2] = byte(udtaSize >> 8)
+		newUdta[3] = byte(udtaSize)
+		newUdta = append(newUdta, []byte("udta")...)
+		newUdta = append(newUdta, udtaContent...)
+		
+		// Insert udta at end of moov
+		insertPos := moovPos + moovSize
+		newData = append(newData, data[:insertPos]...)
+		newData = append(newData, newUdta...)
+		newData = append(newData, data[insertPos:]...)
+	}
+	
+	// Update moov size
+	newMoovSize := moovSize + len(newData) - len(data)
+	newData[moovPos] = byte(newMoovSize >> 24)
+	newData[moovPos+1] = byte(newMoovSize >> 16)
+	newData[moovPos+2] = byte(newMoovSize >> 8)
+	newData[moovPos+3] = byte(newMoovSize)
+
+	// Write back to file
+	if err := os.WriteFile(filePath, newData, 0644); err != nil {
+		return fmt.Errorf("failed to write M4A file: %w", err)
+	}
+
+	fmt.Printf("[M4A] Metadata embedded successfully\n")
+	return nil
+}
+
+// findAtom finds an atom by name starting from offset
+func findAtom(data []byte, name string, offset int) int {
+	for i := offset; i < len(data)-8; {
+		size := int(data[i]<<24 | data[i+1]<<16 | data[i+2]<<8 | data[i+3])
+		if size < 8 {
+			break
+		}
+		atomName := string(data[i+4 : i+8])
+		if atomName == name {
+			return i
+		}
+		i += size
+	}
+	return -1
+}
+
+// buildMetaAtom builds a complete meta atom with ilst containing metadata
+func buildMetaAtom(metadata Metadata, coverData []byte) []byte {
+	// Build ilst content
+	var ilst []byte
+	
+	// ©nam - Title
+	if metadata.Title != "" {
+		ilst = append(ilst, buildTextAtom("©nam", metadata.Title)...)
+	}
+	
+	// ©ART - Artist
+	if metadata.Artist != "" {
+		ilst = append(ilst, buildTextAtom("©ART", metadata.Artist)...)
+	}
+	
+	// ©alb - Album
+	if metadata.Album != "" {
+		ilst = append(ilst, buildTextAtom("©alb", metadata.Album)...)
+	}
+	
+	// aART - Album Artist
+	if metadata.AlbumArtist != "" {
+		ilst = append(ilst, buildTextAtom("aART", metadata.AlbumArtist)...)
+	}
+	
+	// ©day - Year/Date
+	if metadata.Date != "" {
+		ilst = append(ilst, buildTextAtom("©day", metadata.Date)...)
+	}
+	
+	// trkn - Track Number
+	if metadata.TrackNumber > 0 {
+		ilst = append(ilst, buildTrackNumberAtom(metadata.TrackNumber, metadata.TotalTracks)...)
+	}
+	
+	// disk - Disc Number
+	if metadata.DiscNumber > 0 {
+		ilst = append(ilst, buildDiscNumberAtom(metadata.DiscNumber, 0)...)
+	}
+	
+	// ©lyr - Lyrics
+	if metadata.Lyrics != "" {
+		ilst = append(ilst, buildTextAtom("©lyr", metadata.Lyrics)...)
+	}
+	
+	// covr - Cover Art
+	if len(coverData) > 0 {
+		ilst = append(ilst, buildCoverAtom(coverData)...)
+	}
+	
+	// Build ilst atom
+	ilstSize := 8 + len(ilst)
+	ilstAtom := make([]byte, 4)
+	ilstAtom[0] = byte(ilstSize >> 24)
+	ilstAtom[1] = byte(ilstSize >> 16)
+	ilstAtom[2] = byte(ilstSize >> 8)
+	ilstAtom[3] = byte(ilstSize)
+	ilstAtom = append(ilstAtom, []byte("ilst")...)
+	ilstAtom = append(ilstAtom, ilst...)
+	
+	// Build hdlr atom (required for meta)
+	hdlr := []byte{
+		0, 0, 0, 33, // size = 33
+		'h', 'd', 'l', 'r',
+		0, 0, 0, 0, // version + flags
+		0, 0, 0, 0, // predefined
+		'm', 'd', 'i', 'r', // handler type
+		'a', 'p', 'p', 'l', // manufacturer
+		0, 0, 0, 0, // component flags
+		0, 0, 0, 0, // component flags mask
+		0, // null terminator
+	}
+	
+	// Build meta atom
+	metaContent := append([]byte{0, 0, 0, 0}, hdlr...) // version + flags + hdlr
+	metaContent = append(metaContent, ilstAtom...)
+	
+	metaSize := 8 + len(metaContent)
+	metaAtom := make([]byte, 4)
+	metaAtom[0] = byte(metaSize >> 24)
+	metaAtom[1] = byte(metaSize >> 16)
+	metaAtom[2] = byte(metaSize >> 8)
+	metaAtom[3] = byte(metaSize)
+	metaAtom = append(metaAtom, []byte("meta")...)
+	metaAtom = append(metaAtom, metaContent...)
+	
+	return metaAtom
+}
+
+// buildTextAtom builds a text metadata atom (©nam, ©ART, etc.)
+func buildTextAtom(name, value string) []byte {
+	valueBytes := []byte(value)
+	
+	// data atom
+	dataSize := 16 + len(valueBytes)
+	dataAtom := make([]byte, 4)
+	dataAtom[0] = byte(dataSize >> 24)
+	dataAtom[1] = byte(dataSize >> 16)
+	dataAtom[2] = byte(dataSize >> 8)
+	dataAtom[3] = byte(dataSize)
+	dataAtom = append(dataAtom, []byte("data")...)
+	dataAtom = append(dataAtom, 0, 0, 0, 1) // type = UTF-8
+	dataAtom = append(dataAtom, 0, 0, 0, 0) // locale
+	dataAtom = append(dataAtom, valueBytes...)
+	
+	// container atom
+	atomSize := 8 + len(dataAtom)
+	atom := make([]byte, 4)
+	atom[0] = byte(atomSize >> 24)
+	atom[1] = byte(atomSize >> 16)
+	atom[2] = byte(atomSize >> 8)
+	atom[3] = byte(atomSize)
+	atom = append(atom, []byte(name)...)
+	atom = append(atom, dataAtom...)
+	
+	return atom
+}
+
+// buildTrackNumberAtom builds trkn atom
+func buildTrackNumberAtom(track, total int) []byte {
+	// data atom with track number
+	dataAtom := []byte{
+		0, 0, 0, 24, // size
+		'd', 'a', 't', 'a',
+		0, 0, 0, 0, // type = implicit
+		0, 0, 0, 0, // locale
+		0, 0, // padding
+		byte(track >> 8), byte(track), // track number
+		byte(total >> 8), byte(total), // total tracks
+		0, 0, // padding
+	}
+	
+	// trkn atom
+	atomSize := 8 + len(dataAtom)
+	atom := make([]byte, 4)
+	atom[0] = byte(atomSize >> 24)
+	atom[1] = byte(atomSize >> 16)
+	atom[2] = byte(atomSize >> 8)
+	atom[3] = byte(atomSize)
+	atom = append(atom, []byte("trkn")...)
+	atom = append(atom, dataAtom...)
+	
+	return atom
+}
+
+// buildDiscNumberAtom builds disk atom
+func buildDiscNumberAtom(disc, total int) []byte {
+	// data atom with disc number
+	dataAtom := []byte{
+		0, 0, 0, 22, // size
+		'd', 'a', 't', 'a',
+		0, 0, 0, 0, // type = implicit
+		0, 0, 0, 0, // locale
+		0, 0, // padding
+		byte(disc >> 8), byte(disc), // disc number
+		byte(total >> 8), byte(total), // total discs
+	}
+	
+	// disk atom
+	atomSize := 8 + len(dataAtom)
+	atom := make([]byte, 4)
+	atom[0] = byte(atomSize >> 24)
+	atom[1] = byte(atomSize >> 16)
+	atom[2] = byte(atomSize >> 8)
+	atom[3] = byte(atomSize)
+	atom = append(atom, []byte("disk")...)
+	atom = append(atom, dataAtom...)
+	
+	return atom
+}
+
+// buildCoverAtom builds covr atom with image data
+func buildCoverAtom(coverData []byte) []byte {
+	// Detect image type (JPEG = 13, PNG = 14)
+	imageType := byte(13) // default JPEG
+	if len(coverData) > 8 && coverData[0] == 0x89 && coverData[1] == 'P' && coverData[2] == 'N' && coverData[3] == 'G' {
+		imageType = 14 // PNG
+	}
+	
+	// data atom
+	dataSize := 16 + len(coverData)
+	dataAtom := make([]byte, 4)
+	dataAtom[0] = byte(dataSize >> 24)
+	dataAtom[1] = byte(dataSize >> 16)
+	dataAtom[2] = byte(dataSize >> 8)
+	dataAtom[3] = byte(dataSize)
+	dataAtom = append(dataAtom, []byte("data")...)
+	dataAtom = append(dataAtom, 0, 0, 0, imageType) // type = JPEG or PNG
+	dataAtom = append(dataAtom, 0, 0, 0, 0)         // locale
+	dataAtom = append(dataAtom, coverData...)
+	
+	// covr atom
+	atomSize := 8 + len(dataAtom)
+	atom := make([]byte, 4)
+	atom[0] = byte(atomSize >> 24)
+	atom[1] = byte(atomSize >> 16)
+	atom[2] = byte(atomSize >> 8)
+	atom[3] = byte(atomSize)
+	atom = append(atom, []byte("covr")...)
+	atom = append(atom, dataAtom...)
+	
+	return atom
+}
+
+// GetM4AQuality reads audio quality from M4A file
+func GetM4AQuality(filePath string) (AudioQuality, error) {
+	data, err := os.ReadFile(filePath)
+	if err != nil {
+		return AudioQuality{}, fmt.Errorf("failed to read M4A file: %w", err)
+	}
+
+	// Find moov -> trak -> mdia -> minf -> stbl -> stsd
+	moovPos := findAtom(data, "moov", 0)
+	if moovPos < 0 {
+		return AudioQuality{}, fmt.Errorf("moov atom not found")
+	}
+
+	// Search for mp4a or alac atom which contains audio info
+	// This is a simplified search - real implementation would traverse the atom tree
+	for i := moovPos; i < len(data)-20; i++ {
+		if string(data[i:i+4]) == "mp4a" || string(data[i:i+4]) == "alac" {
+			// Sample rate is at offset 22-23 from atom start (16-bit big-endian)
+			if i+24 < len(data) {
+				sampleRate := int(data[i+22])<<8 | int(data[i+23])
+				// For AAC, bit depth is typically 16
+				bitDepth := 16
+				if string(data[i:i+4]) == "alac" {
+					// ALAC can have higher bit depth, check esds or alac specific data
+					bitDepth = 24 // Assume 24-bit for ALAC
+				}
+				return AudioQuality{BitDepth: bitDepth, SampleRate: sampleRate}, nil
+			}
+		}
+	}
+
+	return AudioQuality{}, fmt.Errorf("audio info not found in M4A file")
+}

go_backend/parallel.go

@@ -0,0 +1,289 @@
+package gobackend
+
+import (
+	"fmt"
+	"sync"
+	"time"
+)
+
+// ========================================
+// ISRC to Track ID Cache
+// ========================================
+
+// TrackIDCacheEntry holds cached track ID with metadata
+type TrackIDCacheEntry struct {
+	TidalTrackID  int64
+	QobuzTrackID  int64
+	AmazonTrackID string
+	ExpiresAt     time.Time
+}
+
+// TrackIDCache caches ISRC to track ID mappings
+type TrackIDCache struct {
+	cache map[string]*TrackIDCacheEntry
+	mu    sync.RWMutex
+	ttl   time.Duration
+}
+
+var (
+	globalTrackIDCache *TrackIDCache
+	trackIDCacheOnce   sync.Once
+)
+
+// GetTrackIDCache returns the global track ID cache
+func GetTrackIDCache() *TrackIDCache {
+	trackIDCacheOnce.Do(func() {
+		globalTrackIDCache = &TrackIDCache{
+			cache: make(map[string]*TrackIDCacheEntry),
+			ttl:   30 * time.Minute, // Cache for 30 minutes
+		}
+	})
+	return globalTrackIDCache
+}
+
+// Get retrieves a cached entry by ISRC
+func (c *TrackIDCache) Get(isrc string) *TrackIDCacheEntry {
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+
+	entry, exists := c.cache[isrc]
+	if !exists || time.Now().After(entry.ExpiresAt) {
+		return nil
+	}
+	return entry
+}
+
+// SetTidal caches Tidal track ID for an ISRC
+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
+	entry.ExpiresAt = time.Now().Add(c.ttl)
+}
+
+// SetQobuz caches Qobuz track ID for an ISRC
+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
+	entry.ExpiresAt = time.Now().Add(c.ttl)
+}
+
+// SetAmazon caches Amazon track ID for an ISRC
+func (c *TrackIDCache) SetAmazon(isrc string, trackID string) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	entry, exists := c.cache[isrc]
+	if !exists {
+		entry = &TrackIDCacheEntry{}
+		c.cache[isrc] = entry
+	}
+	entry.AmazonTrackID = trackID
+	entry.ExpiresAt = time.Now().Add(c.ttl)
+}
+
+// Clear removes all cached entries
+func (c *TrackIDCache) Clear() {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	c.cache = make(map[string]*TrackIDCacheEntry)
+}
+
+// Size returns the number of cached entries
+func (c *TrackIDCache) Size() int {
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+	return len(c.cache)
+}
+
+// ========================================
+// Parallel Download Helper
+// ========================================
+
+// ParallelDownloadResult holds results from parallel operations
+type ParallelDownloadResult struct {
+	CoverData  []byte
+	LyricsData *LyricsResponse
+	LyricsLRC  string
+	CoverErr   error
+	LyricsErr  error
+}
+
+// FetchCoverAndLyricsParallel downloads cover and fetches lyrics in parallel
+// This runs while the main audio download is happening
+func FetchCoverAndLyricsParallel(
+	coverURL string,
+	maxQualityCover bool,
+	spotifyID string,
+	trackName string,
+	artistName string,
+	embedLyrics bool,
+) *ParallelDownloadResult {
+	result := &ParallelDownloadResult{}
+	var wg sync.WaitGroup
+
+	// Download cover in parallel
+	if coverURL != "" {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			fmt.Println("[Parallel] Starting cover download...")
+			data, err := downloadCoverToMemory(coverURL, maxQualityCover)
+			if err != nil {
+				result.CoverErr = err
+				fmt.Printf("[Parallel] Cover download failed: %v\n", err)
+			} else {
+				result.CoverData = data
+				fmt.Printf("[Parallel] Cover downloaded: %d bytes\n", len(data))
+			}
+		}()
+	}
+
+	// Fetch lyrics in parallel
+	if embedLyrics {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			fmt.Println("[Parallel] Starting lyrics fetch...")
+			client := NewLyricsClient()
+			lyrics, err := client.FetchLyricsAllSources(spotifyID, trackName, artistName)
+			if err != nil {
+				result.LyricsErr = err
+				fmt.Printf("[Parallel] Lyrics fetch failed: %v\n", err)
+			} else if lyrics != nil && len(lyrics.Lines) > 0 {
+				result.LyricsData = lyrics
+				// Use LRC with metadata headers (like PC version)
+				result.LyricsLRC = convertToLRCWithMetadata(lyrics, trackName, artistName)
+				fmt.Printf("[Parallel] Lyrics fetched: %d lines\n", len(lyrics.Lines))
+			} else {
+				result.LyricsErr = fmt.Errorf("no lyrics found")
+				fmt.Println("[Parallel] No lyrics found")
+			}
+		}()
+	}
+
+	wg.Wait()
+	return result
+}
+
+// ========================================
+// Pre-warm Cache for Album/Playlist
+// ========================================
+
+// PreWarmCacheRequest represents a track to pre-warm cache for
+type PreWarmCacheRequest struct {
+	ISRC       string
+	TrackName  string
+	ArtistName string
+	SpotifyID  string // Needed for Amazon (SongLink lookup)
+	Service    string // "tidal", "qobuz", "amazon"
+}
+
+// PreWarmTrackCache pre-fetches track IDs for multiple tracks (for album/playlist)
+// This runs in background while user is viewing the track list
+func PreWarmTrackCache(requests []PreWarmCacheRequest) {
+	if len(requests) == 0 {
+		return
+	}
+
+	fmt.Printf("[Cache] Pre-warming cache for %d tracks...\n", len(requests))
+	cache := GetTrackIDCache()
+
+	// Limit concurrent pre-warm requests
+	semaphore := make(chan struct{}, 3) // Max 3 concurrent
+	var wg sync.WaitGroup
+
+	for _, req := range requests {
+		// Skip if already cached
+		if cached := cache.Get(req.ISRC); cached != nil {
+			continue
+		}
+
+		wg.Add(1)
+		go func(r PreWarmCacheRequest) {
+			defer wg.Done()
+			semaphore <- struct{}{}        // Acquire
+			defer func() { <-semaphore }() // Release
+
+			switch r.Service {
+			case "tidal":
+				preWarmTidalCache(r.ISRC, r.TrackName, r.ArtistName)
+			case "qobuz":
+				preWarmQobuzCache(r.ISRC)
+			case "amazon":
+				preWarmAmazonCache(r.ISRC, r.SpotifyID)
+			}
+		}(req)
+	}
+
+	wg.Wait()
+	fmt.Printf("[Cache] Pre-warm complete. Cache size: %d\n", cache.Size())
+}
+
+func preWarmTidalCache(isrc, trackName, artistName string) {
+	downloader := NewTidalDownloader()
+	track, err := downloader.SearchTrackByISRC(isrc)
+	if err == nil && track != nil {
+		GetTrackIDCache().SetTidal(isrc, track.ID)
+		fmt.Printf("[Cache] Cached Tidal ID for ISRC %s: %d\n", isrc, track.ID)
+	}
+}
+
+func preWarmQobuzCache(isrc string) {
+	downloader := NewQobuzDownloader()
+	track, err := downloader.SearchTrackByISRC(isrc)
+	if err == nil && track != nil {
+		GetTrackIDCache().SetQobuz(isrc, track.ID)
+		fmt.Printf("[Cache] Cached Qobuz ID for ISRC %s: %d\n", isrc, track.ID)
+	}
+}
+
+func preWarmAmazonCache(isrc, spotifyID string) {
+	// Amazon uses SongLink to get URL, so we pre-warm by checking availability
+	client := NewSongLinkClient()
+	availability, err := client.CheckTrackAvailability(spotifyID, isrc)
+	if err == nil && availability != nil && availability.Amazon {
+		// Store Amazon URL in cache (using ISRC as key)
+		GetTrackIDCache().SetAmazon(isrc, availability.AmazonURL)
+		fmt.Printf("[Cache] Cached Amazon URL for ISRC %s\n", isrc)
+	}
+}
+
+// ========================================
+// Exported Functions for Flutter
+// ========================================
+
+// PreWarmCache is called from Flutter to pre-warm cache for album/playlist tracks
+// tracksJSON is a JSON array of {isrc, track_name, artist_name, service}
+func PreWarmCache(tracksJSON string) error {
+	var requests []PreWarmCacheRequest
+	// Parse JSON (simplified - in production use proper JSON parsing)
+	// For now, this is called from exports.go with proper parsing
+	
+	go PreWarmTrackCache(requests) // Run in background
+	return nil
+}
+
+// ClearTrackCache clears the track ID cache
+func ClearTrackCache() {
+	GetTrackIDCache().Clear()
+	fmt.Println("[Cache] Track ID cache cleared")
+}
+
+// GetCacheSize returns the current cache size
+func GetCacheSize() int {
+	return GetTrackIDCache().Size()
+}

go_backend/progress.go

@@ -3,9 +3,11 @@ package gobackend
 import (
 	"encoding/json"
 	"sync"
+	"time"
 )
 
-// DownloadProgress represents current download progress (legacy single download)
+// DownloadProgress represents current download progress
+// Now unified - returns data from multi-progress system
 type DownloadProgress struct {
 	CurrentFile   string  `json:"current_file"`
 	Progress      float64 `json:"progress"`
@@ -13,6 +15,7 @@ type DownloadProgress struct {
 	BytesTotal    int64   `json:"bytes_total"`
 	BytesReceived int64   `json:"bytes_received"`
 	IsDownloading bool    `json:"is_downloading"`
+	Status        string  `json:"status"` // "downloading", "finalizing", "completed"
 }
 
 // ItemProgress represents progress for a single download item
@@ -21,7 +24,9 @@ type ItemProgress struct {
 	BytesTotal    int64   `json:"bytes_total"`
 	BytesReceived int64   `json:"bytes_received"`
 	Progress      float64 `json:"progress"` // 0.0 to 1.0
+	SpeedMBps     float64 `json:"speed_mbps"` // Download speed in MB/s
 	IsDownloading bool    `json:"is_downloading"`
+	Status        string  `json:"status"` // "downloading", "finalizing", "completed"
 }
 
 // MultiProgress holds progress for multiple concurrent downloads
@@ -30,28 +35,40 @@ type MultiProgress struct {
 }
 
 var (
-	currentProgress DownloadProgress
-	progressMu      sync.RWMutex
-	downloadDir     string
-	downloadDirMu   sync.RWMutex
-	
-	// Multi-download progress tracking
+	downloadDir   string
+	downloadDirMu sync.RWMutex
+
+	// Multi-download progress tracking (unified system)
 	multiProgress = MultiProgress{Items: make(map[string]*ItemProgress)}
 	multiMu       sync.RWMutex
 )
 
-// getProgress returns current download progress (legacy)
+// getProgress returns current download progress from multi-progress system
+// Returns first active item's progress for backward compatibility
 func getProgress() DownloadProgress {
-	progressMu.RLock()
-	defer progressMu.RUnlock()
-	return currentProgress
+	multiMu.RLock()
+	defer multiMu.RUnlock()
+
+	// Find first active item
+	for _, item := range multiProgress.Items {
+		return DownloadProgress{
+			CurrentFile:   item.ItemID,
+			Progress:      item.Progress * 100, // Convert to percentage
+			BytesTotal:    item.BytesTotal,
+			BytesReceived: item.BytesReceived,
+			IsDownloading: item.IsDownloading,
+			Status:        item.Status,
+		}
+	}
+
+	return DownloadProgress{}
 }
 
 // GetMultiProgress returns progress for all active downloads as JSON
 func GetMultiProgress() string {
 	multiMu.RLock()
 	defer multiMu.RUnlock()
-	
+
 	jsonBytes, err := json.Marshal(multiProgress)
 	if err != nil {
 		return "{\"items\":{}}"
@@ -63,7 +80,7 @@ func GetMultiProgress() string {
 func GetItemProgress(itemID string) string {
 	multiMu.RLock()
 	defer multiMu.RUnlock()
-	
+
 	if item, ok := multiProgress.Items[itemID]; ok {
 		jsonBytes, _ := json.Marshal(item)
 		return string(jsonBytes)
@@ -75,13 +92,14 @@ func GetItemProgress(itemID string) string {
 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",
 	}
 }
 
@@ -89,7 +107,7 @@ func StartItemProgress(itemID string) {
 func SetItemBytesTotal(itemID string, total int64) {
 	multiMu.Lock()
 	defer multiMu.Unlock()
-	
+
 	if item, ok := multiProgress.Items[itemID]; ok {
 		item.BytesTotal = total
 	}
@@ -99,7 +117,7 @@ func SetItemBytesTotal(itemID string, total int64) {
 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 {
@@ -108,14 +126,56 @@ func SetItemBytesReceived(itemID string, received int64) {
 	}
 }
 
+// SetItemBytesReceivedWithSpeed sets bytes received and speed for an item
+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)
+		}
+	}
+}
+
 // CompleteItemProgress marks an item as complete
 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"
+	}
+}
+
+// SetItemProgress sets progress for an item directly
+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
+		}
+	}
+}
+
+// SetItemFinalizing marks an item as finalizing (embedding metadata)
+func SetItemFinalizing(itemID string) {
+	multiMu.Lock()
+	defer multiMu.Unlock()
+
+	if item, ok := multiProgress.Items[itemID]; ok {
+		item.Progress = 1.0
+		item.Status = "finalizing"
 	}
 }
 
@@ -123,7 +183,7 @@ func CompleteItemProgress(itemID string) {
 func RemoveItemProgress(itemID string) {
 	multiMu.Lock()
 	defer multiMu.Unlock()
-	
+
 	delete(multiProgress.Items, itemID)
 }
 
@@ -131,45 +191,10 @@ func RemoveItemProgress(itemID string) {
 func ClearAllItemProgress() {
 	multiMu.Lock()
 	defer multiMu.Unlock()
-	
+
 	multiProgress.Items = make(map[string]*ItemProgress)
 }
 
-// Legacy functions for backward compatibility
-
-// SetDownloadProgress sets the current download progress (MB downloaded)
-func SetDownloadProgress(mbDownloaded float64) {
-	progressMu.Lock()
-	defer progressMu.Unlock()
-	currentProgress.Progress = mbDownloaded
-	currentProgress.IsDownloading = true
-}
-
-// SetDownloadSpeed sets the current download speed
-func SetDownloadSpeed(speedMBps float64) {
-	progressMu.Lock()
-	defer progressMu.Unlock()
-	currentProgress.Speed = speedMBps
-}
-
-// SetCurrentFile sets the current file being downloaded and resets progress
-func SetCurrentFile(filename string) {
-	progressMu.Lock()
-	defer progressMu.Unlock()
-	currentProgress.BytesReceived = 0
-	currentProgress.BytesTotal = 0
-	currentProgress.Progress = 0
-	currentProgress.CurrentFile = filename
-	currentProgress.IsDownloading = true
-}
-
-// 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()
@@ -185,87 +210,57 @@ func getDownloadDir() string {
 	return downloadDir
 }
 
-// SetDownloading sets the download status
-func SetDownloading(status bool) {
-	progressMu.Lock()
-	defer progressMu.Unlock()
-	currentProgress.IsDownloading = status
-}
-
-// 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
-	}
-}
-
-// ProgressWriter wraps io.Writer to track download progress (legacy single)
-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 {
-	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)
-	pw.total += int64(n)
-	SetBytesReceived(pw.current)
-	return n, nil
-}
-
-// GetTotal returns total bytes written
-func (pw *ProgressWriter) GetTotal() int64 {
-	return pw.total
-}
-
 // ItemProgressWriter wraps io.Writer to track download progress for a specific item
 type ItemProgressWriter struct {
-	writer  interface{ Write([]byte) (int, error) }
-	itemID  string
-	current int64
+	writer       interface{ Write([]byte) (int, error) }
+	itemID       string
+	current      int64
+	lastReported int64     // Track last reported bytes for threshold-based updates
+	startTime    time.Time // Track start time for speed calculation
+	lastTime     time.Time // Track last update time for speed calculation
+	lastBytes    int64     // Track bytes at last speed calculation
 }
 
+const progressUpdateThreshold = 64 * 1024 // Update progress every 64KB
+
 // NewItemProgressWriter creates a new progress writer for a specific item
 func NewItemProgressWriter(w interface{ Write([]byte) (int, error) }, itemID string) *ItemProgressWriter {
+	now := time.Now()
 	return &ItemProgressWriter{
-		writer:  w,
-		itemID:  itemID,
-		current: 0,
+		writer:       w,
+		itemID:       itemID,
+		current:      0,
+		lastReported: 0,
+		startTime:    now,
+		lastTime:     now,
+		lastBytes:    0,
 	}
 }
 
-// Write implements io.Writer
+// Write implements io.Writer with threshold-based progress updates and speed tracking
 func (pw *ItemProgressWriter) Write(p []byte) (int, error) {
 	n, err := pw.writer.Write(p)
 	if err != nil {
 		return n, err
 	}
 	pw.current += int64(n)
-	SetItemBytesReceived(pw.itemID, pw.current)
+
+	// Update progress when we've received at least 64KB since last update
+	// Also update on first write to show download has started
+	if pw.lastReported == 0 || pw.current-pw.lastReported >= progressUpdateThreshold {
+		// Calculate speed (MB/s) based on bytes received since last update
+		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
+	}
 	return n, nil
 }

go_backend/qobuz.go

@@ -1,6 +1,7 @@
 package gobackend
 
 import (
+	"bufio"
 	"encoding/base64"
 	"encoding/json"
 	"fmt"
@@ -9,6 +10,8 @@ import (
 	"net/url"
 	"os"
 	"path/filepath"
+	"strings"
+	"sync"
 )
 
 // QobuzDownloader handles Qobuz downloads
@@ -18,6 +21,12 @@ type QobuzDownloader struct {
 	apiURL string
 }
 
+var (
+	// Global Qobuz downloader instance for connection reuse
+	globalQobuzDownloader *QobuzDownloader
+	qobuzDownloaderOnce   sync.Once
+)
+
 // QobuzTrack represents a Qobuz track
 type QobuzTrack struct {
 	ID                  int64   `json:"id"`
@@ -39,12 +48,257 @@ type QobuzTrack struct {
 	} `json:"performer"`
 }
 
-// NewQobuzDownloader creates a new Qobuz downloader
-func NewQobuzDownloader() *QobuzDownloader {
-	return &QobuzDownloader{
-		client: NewHTTPClientWithTimeout(DefaultTimeout), // 60s timeout
-		appID:  "798273057",
+// qobuzArtistsMatch checks if the artist names are similar enough
+func qobuzArtistsMatch(expectedArtist, foundArtist string) bool {
+	normExpected := strings.ToLower(strings.TrimSpace(expectedArtist))
+	normFound := strings.ToLower(strings.TrimSpace(foundArtist))
+
+	// Exact match
+	if normExpected == normFound {
+		return true
 	}
+
+	// Check if one contains the other
+	if strings.Contains(normExpected, normFound) || strings.Contains(normFound, normExpected) {
+		return true
+	}
+
+	// Check first artist (before comma or feat)
+	expectedFirst := strings.Split(normExpected, ",")[0]
+	expectedFirst = strings.Split(expectedFirst, " feat")[0]
+	expectedFirst = strings.Split(expectedFirst, " ft.")[0]
+	expectedFirst = strings.TrimSpace(expectedFirst)
+
+	foundFirst := strings.Split(normFound, ",")[0]
+	foundFirst = strings.Split(foundFirst, " feat")[0]
+	foundFirst = strings.Split(foundFirst, " ft.")[0]
+	foundFirst = strings.TrimSpace(foundFirst)
+
+	if expectedFirst == foundFirst {
+		return true
+	}
+
+	// Check if first artist is contained in the other
+	if strings.Contains(expectedFirst, foundFirst) || strings.Contains(foundFirst, expectedFirst) {
+		return true
+	}
+
+	// If scripts are TRULY different (Latin vs CJK/Arabic/Cyrillic), assume match (transliteration)
+	// Don't treat Latin Extended (Polish, French, etc.) as different script
+	expectedLatin := qobuzIsLatinScript(expectedArtist)
+	foundLatin := qobuzIsLatinScript(foundArtist)
+	if expectedLatin != foundLatin {
+		GoLog("[Qobuz] Artist names in different scripts, assuming match: '%s' vs '%s'\n", expectedArtist, foundArtist)
+		return true
+	}
+
+	return false
+}
+
+// qobuzTitlesMatch checks if track titles are similar enough
+func qobuzTitlesMatch(expectedTitle, foundTitle string) bool {
+	normExpected := strings.ToLower(strings.TrimSpace(expectedTitle))
+	normFound := strings.ToLower(strings.TrimSpace(foundTitle))
+
+	// Exact match
+	if normExpected == normFound {
+		return true
+	}
+
+	// Check if one contains the other
+	if strings.Contains(normExpected, normFound) || strings.Contains(normFound, normExpected) {
+		return true
+	}
+
+	// Clean BOTH titles and compare (removes suffixes like remaster, remix, etc)
+	cleanExpected := qobuzCleanTitle(normExpected)
+	cleanFound := qobuzCleanTitle(normFound)
+
+	if cleanExpected == cleanFound {
+		return true
+	}
+
+	// Check if cleaned versions contain each other
+	if cleanExpected != "" && cleanFound != "" {
+		if strings.Contains(cleanExpected, cleanFound) || strings.Contains(cleanFound, cleanExpected) {
+			return true
+		}
+	}
+
+	// Extract core title (before any parentheses/brackets)
+	coreExpected := qobuzExtractCoreTitle(normExpected)
+	coreFound := qobuzExtractCoreTitle(normFound)
+	
+	if coreExpected != "" && coreFound != "" && coreExpected == coreFound {
+		return true
+	}
+
+	// If scripts are TRULY different (Latin vs CJK/Arabic/Cyrillic), assume match (transliteration)
+	// Don't treat Latin Extended (Polish, French, etc.) as different script
+	expectedLatin := qobuzIsLatinScript(expectedTitle)
+	foundLatin := qobuzIsLatinScript(foundTitle)
+	if expectedLatin != foundLatin {
+		GoLog("[Qobuz] Titles in different scripts, assuming match: '%s' vs '%s'\n", expectedTitle, foundTitle)
+		return true
+	}
+
+	return false
+}
+
+// qobuzExtractCoreTitle extracts the main title before any parentheses or brackets
+func qobuzExtractCoreTitle(title string) string {
+	// Find first occurrence of ( or [
+	parenIdx := strings.Index(title, "(")
+	bracketIdx := strings.Index(title, "[")
+	dashIdx := strings.Index(title, " - ")
+	
+	cutIdx := len(title)
+	if parenIdx > 0 && parenIdx < cutIdx {
+		cutIdx = parenIdx
+	}
+	if bracketIdx > 0 && bracketIdx < cutIdx {
+		cutIdx = bracketIdx
+	}
+	if dashIdx > 0 && dashIdx < cutIdx {
+		cutIdx = dashIdx
+	}
+	
+	return strings.TrimSpace(title[:cutIdx])
+}
+
+// qobuzCleanTitle removes common suffixes from track titles for comparison
+func qobuzCleanTitle(title string) string {
+	cleaned := title
+
+	// Remove content in parentheses/brackets that are version indicators
+	// This helps match "Song (Remastered)" with "Song" or "Song (2024 Remaster)"
+	versionPatterns := []string{
+		"remaster", "remastered", "deluxe", "bonus", "single", 
+		"album version", "radio edit", "original mix", "extended",
+		"club mix", "remix", "live", "acoustic", "demo",
+	}
+	
+	// Remove parenthetical content if it contains version indicators
+	for {
+		startParen := strings.LastIndex(cleaned, "(")
+		endParen := strings.LastIndex(cleaned, ")")
+		if startParen >= 0 && endParen > startParen {
+			content := strings.ToLower(cleaned[startParen+1 : endParen])
+			isVersionIndicator := false
+			for _, pattern := range versionPatterns {
+				if strings.Contains(content, pattern) {
+					isVersionIndicator = true
+					break
+				}
+			}
+			if isVersionIndicator {
+				cleaned = strings.TrimSpace(cleaned[:startParen]) + cleaned[endParen+1:]
+				continue
+			}
+		}
+		break
+	}
+	
+	// Same for brackets
+	for {
+		startBracket := strings.LastIndex(cleaned, "[")
+		endBracket := strings.LastIndex(cleaned, "]")
+		if startBracket >= 0 && endBracket > startBracket {
+			content := strings.ToLower(cleaned[startBracket+1 : endBracket])
+			isVersionIndicator := false
+			for _, pattern := range versionPatterns {
+				if strings.Contains(content, pattern) {
+					isVersionIndicator = true
+					break
+				}
+			}
+			if isVersionIndicator {
+				cleaned = strings.TrimSpace(cleaned[:startBracket]) + cleaned[endBracket+1:]
+				continue
+			}
+		}
+		break
+	}
+
+	// Remove trailing " - version" patterns
+	dashPatterns := []string{
+		" - remaster", " - remastered", " - single version", " - radio edit",
+		" - live", " - acoustic", " - demo", " - remix",
+	}
+	for _, pattern := range dashPatterns {
+		if strings.HasSuffix(strings.ToLower(cleaned), pattern) {
+			cleaned = cleaned[:len(cleaned)-len(pattern)]
+		}
+	}
+
+	// Remove multiple spaces
+	for strings.Contains(cleaned, "  ") {
+		cleaned = strings.ReplaceAll(cleaned, "  ", " ")
+	}
+
+	return strings.TrimSpace(cleaned)
+}
+
+// qobuzIsLatinScript checks if a string is primarily Latin script
+// Returns true for ASCII and Latin Extended characters (European languages)
+// Returns false for CJK, Arabic, Cyrillic, etc.
+func qobuzIsLatinScript(s string) bool {
+	for _, r := range s {
+		// Skip common punctuation and numbers
+		if r < 128 {
+			continue
+		}
+		// Latin Extended-A: U+0100 to U+017F (Polish, Czech, etc.)
+		// Latin Extended-B: U+0180 to U+024F
+		// Latin Extended Additional: U+1E00 to U+1EFF
+		// Latin Extended-C/D/E: various ranges
+		if (r >= 0x0100 && r <= 0x024F) || // Latin Extended A & B
+			(r >= 0x1E00 && r <= 0x1EFF) || // Latin Extended Additional
+			(r >= 0x00C0 && r <= 0x00FF) { // Latin-1 Supplement (accented chars)
+			continue
+		}
+		// CJK ranges - definitely different script
+		if (r >= 0x4E00 && r <= 0x9FFF) || // CJK Unified Ideographs
+			(r >= 0x3040 && r <= 0x309F) || // Hiragana
+			(r >= 0x30A0 && r <= 0x30FF) || // Katakana
+			(r >= 0xAC00 && r <= 0xD7AF) || // Hangul (Korean)
+			(r >= 0x0600 && r <= 0x06FF) || // Arabic
+			(r >= 0x0400 && r <= 0x04FF) { // Cyrillic
+			return false
+		}
+	}
+	return true
+}
+
+// qobuzIsASCIIString checks if a string contains only ASCII characters
+func qobuzIsASCIIString(s string) bool {
+	for _, r := range s {
+		if r > 127 {
+			return false
+		}
+	}
+	return true
+}
+
+// containsQueryQobuz checks if a query already exists in the list
+func containsQueryQobuz(queries []string, query string) bool {
+	for _, q := range queries {
+		if q == query {
+			return true
+		}
+	}
+	return false
+}
+
+// NewQobuzDownloader creates a new Qobuz downloader (returns singleton for connection reuse)
+func NewQobuzDownloader() *QobuzDownloader {
+	qobuzDownloaderOnce.Do(func() {
+		globalQobuzDownloader = &QobuzDownloader{
+			client: NewHTTPClientWithTimeout(DefaultTimeout), // 60s timeout
+			appID:  "798273057",
+		}
+	})
+	return globalQobuzDownloader
 }
 
 // GetAvailableAPIs returns list of available Qobuz APIs
@@ -53,8 +307,8 @@ func (q *QobuzDownloader) GetAvailableAPIs() []string {
 	// Same APIs as PC version (referensi/backend/qobuz.go)
 	// Primary: dab.yeet.su, Fallback: dabmusic.xyz
 	encodedAPIs := []string{
-		"ZGFiLnllZXQuc3UvYXBpL3N0cmVhbT90cmFja0lkPQ==",     // dab.yeet.su/api/stream?trackId= (PRIMARY - same as PC)
-		"ZGFibXVzaWMueHl6L2FwaS9zdHJlYW0/dHJhY2tJZD0=",     // dabmusic.xyz/api/stream?trackId= (FALLBACK - same as PC)
+		"ZGFiLnllZXQuc3UvYXBpL3N0cmVhbT90cmFja0lkPQ==", // dab.yeet.su/api/stream?trackId= (PRIMARY - same as PC)
+		"ZGFibXVzaWMueHl6L2FwaS9zdHJlYW0/dHJhY2tJZD0=", // dabmusic.xyz/api/stream?trackId= (FALLBACK - same as PC)
 	}
 
 	var apis []string
@@ -112,11 +366,107 @@ func (q *QobuzDownloader) SearchTrackByISRC(isrc string) (*QobuzTrack, error) {
 	return nil, fmt.Errorf("no exact ISRC match found for: %s", isrc)
 }
 
+// SearchTrackByISRCWithTitle searches for a track by ISRC with duration verification
+// expectedDurationSec is the expected duration in seconds (0 to skip verification)
+func (q *QobuzDownloader) SearchTrackByISRCWithDuration(isrc string, expectedDurationSec int) (*QobuzTrack, error) {
+	GoLog("[Qobuz] Searching by ISRC: %s\n", isrc)
+	
+	apiBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly93d3cucW9idXouY29tL2FwaS5qc29uLzAuMi90cmFjay9zZWFyY2g/cXVlcnk9")
+	searchURL := fmt.Sprintf("%s%s&limit=50&app_id=%s", string(apiBase), url.QueryEscape(isrc), q.appID)
+
+	req, err := http.NewRequest("GET", searchURL, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	resp, err := DoRequestWithUserAgent(q.client, req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return nil, fmt.Errorf("search failed: HTTP %d", resp.StatusCode)
+	}
+
+	var result struct {
+		Tracks struct {
+			Items []QobuzTrack `json:"items"`
+		} `json:"tracks"`
+	}
+	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
+		return nil, err
+	}
+
+	GoLog("[Qobuz] ISRC search returned %d results\n", len(result.Tracks.Items))
+
+	// Find ISRC matches
+	var isrcMatches []*QobuzTrack
+	for i := range result.Tracks.Items {
+		if result.Tracks.Items[i].ISRC == isrc {
+			isrcMatches = append(isrcMatches, &result.Tracks.Items[i])
+		}
+	}
+
+	GoLog("[Qobuz] Found %d exact ISRC matches\n", len(isrcMatches))
+
+	if len(isrcMatches) > 0 {
+		// Verify duration if provided
+		if expectedDurationSec > 0 {
+			var durationVerifiedMatches []*QobuzTrack
+			for _, track := range isrcMatches {
+				durationDiff := track.Duration - expectedDurationSec
+				if durationDiff < 0 {
+					durationDiff = -durationDiff
+				}
+				// Allow 10 seconds tolerance
+				if durationDiff <= 10 {
+					durationVerifiedMatches = append(durationVerifiedMatches, track)
+				}
+			}
+
+			if len(durationVerifiedMatches) > 0 {
+				GoLog("[Qobuz] ISRC match with duration verification: '%s' (expected %ds, found %ds)\n",
+					durationVerifiedMatches[0].Title, expectedDurationSec, durationVerifiedMatches[0].Duration)
+				return durationVerifiedMatches[0], nil
+			}
+
+			// ISRC matches but duration doesn't
+			GoLog("[Qobuz] WARNING: ISRC %s found but duration mismatch. Expected=%ds, Found=%ds. Rejecting.\n",
+				isrc, expectedDurationSec, isrcMatches[0].Duration)
+			return nil, fmt.Errorf("ISRC found but duration mismatch: expected %ds, found %ds (likely different version)",
+				expectedDurationSec, isrcMatches[0].Duration)
+		}
+
+		// No duration to verify, return first match
+		GoLog("[Qobuz] ISRC match (no duration verification): '%s'\n", isrcMatches[0].Title)
+		return isrcMatches[0], nil
+	}
+
+	if len(result.Tracks.Items) == 0 {
+		return nil, fmt.Errorf("no tracks found for ISRC: %s", isrc)
+	}
+
+	return nil, fmt.Errorf("no exact ISRC match found for: %s", isrc)
+}
+
+// SearchTrackByISRCWithTitle is deprecated, use SearchTrackByISRCWithDuration instead
+func (q *QobuzDownloader) SearchTrackByISRCWithTitle(isrc, expectedTitle string) (*QobuzTrack, error) {
+	return q.SearchTrackByISRCWithDuration(isrc, 0)
+}
+
 // SearchTrackByMetadata searches for a track using artist name and track name
 func (q *QobuzDownloader) SearchTrackByMetadata(trackName, artistName string) (*QobuzTrack, error) {
+	return q.SearchTrackByMetadataWithDuration(trackName, artistName, 0)
+}
+
+// SearchTrackByMetadataWithDuration searches for a track with duration verification
+// Now includes romaji conversion for Japanese text (same as Tidal)
+// Also includes title verification to prevent wrong song downloads
+func (q *QobuzDownloader) SearchTrackByMetadataWithDuration(trackName, artistName string, expectedDurationSec int) (*QobuzTrack, error) {
 	apiBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly93d3cucW9idXouY29tL2FwaS5qc29uLzAuMi90cmFjay9zZWFyY2g/cXVlcnk9")
 
-	// Try multiple search strategies
+	// Try multiple search strategies (same as Tidal/PC version)
 	queries := []string{}
 
 	// Strategy 1: Artist + Track name
@@ -129,8 +479,54 @@ func (q *QobuzDownloader) SearchTrackByMetadata(trackName, artistName string) (*
 		queries = append(queries, trackName)
 	}
 
+	// Strategy 3: Romaji versions if Japanese detected
+	if ContainsJapanese(trackName) || ContainsJapanese(artistName) {
+		// Convert to romaji (hiragana/katakana only, kanji stays)
+		romajiTrack := JapaneseToRomaji(trackName)
+		romajiArtist := JapaneseToRomaji(artistName)
+
+		// Clean and remove ALL non-ASCII characters (including kanji)
+		cleanRomajiTrack := CleanToASCII(romajiTrack)
+		cleanRomajiArtist := CleanToASCII(romajiArtist)
+
+		// Artist + Track romaji (cleaned to ASCII only)
+		if cleanRomajiArtist != "" && cleanRomajiTrack != "" {
+			romajiQuery := cleanRomajiArtist + " " + cleanRomajiTrack
+			if !containsQueryQobuz(queries, romajiQuery) {
+				queries = append(queries, romajiQuery)
+				GoLog("[Qobuz] Japanese detected, adding romaji query: %s\n", romajiQuery)
+			}
+		}
+
+		// Track romaji only (cleaned)
+		if cleanRomajiTrack != "" && cleanRomajiTrack != trackName {
+			if !containsQueryQobuz(queries, cleanRomajiTrack) {
+				queries = append(queries, cleanRomajiTrack)
+			}
+		}
+	}
+
+	// Strategy 4: Artist only as last resort
+	if artistName != "" {
+		artistOnly := CleanToASCII(JapaneseToRomaji(artistName))
+		if artistOnly != "" && !containsQueryQobuz(queries, artistOnly) {
+			queries = append(queries, artistOnly)
+		}
+	}
+
+	var allTracks []QobuzTrack
+	searchedQueries := make(map[string]bool)
+
 	for _, query := range queries {
-		searchURL := fmt.Sprintf("%s%s&limit=50&app_id=%s", string(apiBase), url.QueryEscape(query), q.appID)
+		cleanQuery := strings.TrimSpace(query)
+		if cleanQuery == "" || searchedQueries[cleanQuery] {
+			continue
+		}
+		searchedQueries[cleanQuery] = true
+
+		GoLog("[Qobuz] Searching for: %s\n", cleanQuery)
+
+		searchURL := fmt.Sprintf("%s%s&limit=50&app_id=%s", string(apiBase), url.QueryEscape(cleanQuery), q.appID)
 
 		req, err := http.NewRequest("GET", searchURL, nil)
 		if err != nil {
@@ -139,6 +535,7 @@ func (q *QobuzDownloader) SearchTrackByMetadata(trackName, artistName string) (*
 
 		resp, err := DoRequestWithUserAgent(q.client, req)
 		if err != nil {
+			GoLog("[Qobuz] Search error for '%s': %v\n", cleanQuery, err)
 			continue
 		}
 
@@ -159,19 +556,82 @@ func (q *QobuzDownloader) SearchTrackByMetadata(trackName, artistName string) (*
 		resp.Body.Close()
 
 		if len(result.Tracks.Items) > 0 {
-			// Return first result with best quality
-			for i := range result.Tracks.Items {
-				track := &result.Tracks.Items[i]
-				if track.MaximumBitDepth >= 24 {
-					return track, nil
-				}
-			}
-			// Return first result if no hi-res found
-			return &result.Tracks.Items[0], nil
+			GoLog("[Qobuz] Found %d results for '%s'\n", len(result.Tracks.Items), cleanQuery)
+			allTracks = append(allTracks, result.Tracks.Items...)
 		}
 	}
 
-	return nil, fmt.Errorf("no tracks found for: %s - %s", artistName, trackName)
+	if len(allTracks) == 0 {
+		return nil, fmt.Errorf("no tracks found for: %s - %s", artistName, trackName)
+	}
+
+	// Filter by title match first (NEW - like Tidal)
+	var titleMatches []*QobuzTrack
+	for i := range allTracks {
+		track := &allTracks[i]
+		if qobuzTitlesMatch(trackName, track.Title) {
+			titleMatches = append(titleMatches, track)
+		}
+	}
+
+	GoLog("[Qobuz] Title matches: %d out of %d results\n", len(titleMatches), len(allTracks))
+
+	// If no title matches, log warning but continue with all tracks
+	tracksToCheck := titleMatches
+	if len(titleMatches) == 0 {
+		GoLog("[Qobuz] WARNING: No title matches for '%s', checking all %d results\n", trackName, len(allTracks))
+		for i := range allTracks {
+			tracksToCheck = append(tracksToCheck, &allTracks[i])
+		}
+	}
+
+	// If duration verification is requested
+	if expectedDurationSec > 0 {
+		var durationMatches []*QobuzTrack
+		for _, track := range tracksToCheck {
+			durationDiff := track.Duration - expectedDurationSec
+			if durationDiff < 0 {
+				durationDiff = -durationDiff
+			}
+			if durationDiff <= 10 {
+				durationMatches = append(durationMatches, track)
+			}
+		}
+
+		if len(durationMatches) > 0 {
+			// Return best quality among duration matches
+			for _, track := range durationMatches {
+				if track.MaximumBitDepth >= 24 {
+					GoLog("[Qobuz] ✓ Match found: '%s' by '%s' (title+duration verified, hi-res)\n", 
+						track.Title, track.Performer.Name)
+					return track, nil
+				}
+			}
+			GoLog("[Qobuz] ✓ Match found: '%s' by '%s' (title+duration verified)\n", 
+				durationMatches[0].Title, durationMatches[0].Performer.Name)
+			return durationMatches[0], nil
+		}
+
+		// No duration match found
+		return nil, fmt.Errorf("no tracks found with matching title and duration (expected '%s', %ds)", trackName, expectedDurationSec)
+	}
+
+	// No duration verification, return best quality from title matches
+	for _, track := range tracksToCheck {
+		if track.MaximumBitDepth >= 24 {
+			GoLog("[Qobuz] ✓ Match found: '%s' by '%s' (title verified, hi-res)\n", 
+				track.Title, track.Performer.Name)
+			return track, nil
+		}
+	}
+	
+	if len(tracksToCheck) > 0 {
+		GoLog("[Qobuz] ✓ Match found: '%s' by '%s' (title verified)\n", 
+			tracksToCheck[0].Title, tracksToCheck[0].Performer.Name)
+		return tracksToCheck[0], nil
+	}
+	
+	return nil, fmt.Errorf("no matching track found for: %s - %s", artistName, trackName)
 }
 
 // getQobuzDownloadURLSequential requests download URL from APIs sequentially
@@ -190,7 +650,7 @@ func getQobuzDownloadURLSequential(apis []string, trackID int64, quality string)
 		// The apiURL already includes the path, just append trackID and quality
 		reqURL := fmt.Sprintf("%s%d&quality=%s", apiURL, trackID, quality)
 
-		fmt.Printf("[Qobuz] Trying: %s\n", reqURL)
+		GoLog("[Qobuz] Trying: %s\n", reqURL)
 
 		req, err := http.NewRequest("GET", reqURL, nil)
 		if err != nil {
@@ -235,7 +695,7 @@ func getQobuzDownloadURLSequential(apis []string, trackID int64, quality string)
 		}
 
 		if result.URL != "" {
-			fmt.Printf("[Qobuz] Got download URL from: %s\n", apiURL)
+			GoLog("[Qobuz] Got download URL from: %s\n", apiURL)
 			return apiURL, result.URL, nil
 		}
 
@@ -262,12 +722,7 @@ func (q *QobuzDownloader) GetDownloadURL(trackID int64, quality string) (string,
 
 // DownloadFile downloads a file from URL with User-Agent and progress tracking
 func (q *QobuzDownloader) DownloadFile(downloadURL, outputPath, itemID string) error {
-	// Set current file being downloaded (legacy)
-	SetCurrentFile(filepath.Base(outputPath))
-	SetDownloading(true)
-	defer SetDownloading(false)
-
-	// Initialize item progress if itemID provided
+	// Initialize item progress (required for all downloads)
 	if itemID != "" {
 		StartItemProgress(itemID)
 		defer CompleteItemProgress(itemID)
@@ -288,59 +743,140 @@ func (q *QobuzDownloader) DownloadFile(downloadURL, outputPath, itemID string) e
 		return fmt.Errorf("download failed: HTTP %d", resp.StatusCode)
 	}
 
+	expectedSize := resp.ContentLength
 	// Set total bytes if available
-	if resp.ContentLength > 0 {
-		SetBytesTotal(resp.ContentLength)
-		if itemID != "" {
-			SetItemBytesTotal(itemID, resp.ContentLength)
-		}
+	if expectedSize > 0 && itemID != "" {
+		SetItemBytesTotal(itemID, expectedSize)
 	}
 
 	out, err := os.Create(outputPath)
 	if err != nil {
 		return err
 	}
-	defer out.Close()
 
-	// Use appropriate progress writer
+	// Use buffered writer for better performance (256KB buffer)
+	bufWriter := bufio.NewWriterSize(out, 256*1024)
+
+	// Use item progress writer with buffered output
+	var written int64
 	if itemID != "" {
-		progressWriter := NewItemProgressWriter(out, itemID)
-		_, err = io.Copy(progressWriter, resp.Body)
+		progressWriter := NewItemProgressWriter(bufWriter, itemID)
+		written, err = io.Copy(progressWriter, resp.Body)
 	} else {
-		progressWriter := NewProgressWriter(out)
-		_, err = io.Copy(progressWriter, resp.Body)
+		// Fallback: direct copy without progress tracking
+		written, err = io.Copy(bufWriter, resp.Body)
 	}
-	return err
+
+	// Flush buffer before checking for errors
+	flushErr := bufWriter.Flush()
+	closeErr := out.Close()
+
+	// Check for any errors
+	if err != nil {
+		os.Remove(outputPath)
+		return fmt.Errorf("download interrupted: %w", err)
+	}
+	if flushErr != nil {
+		os.Remove(outputPath)
+		return fmt.Errorf("failed to flush buffer: %w", flushErr)
+	}
+	if closeErr != nil {
+		os.Remove(outputPath)
+		return fmt.Errorf("failed to close file: %w", closeErr)
+	}
+
+	// Verify file size if Content-Length was provided
+	if expectedSize > 0 && written != expectedSize {
+		os.Remove(outputPath)
+		return fmt.Errorf("incomplete download: expected %d bytes, got %d bytes", expectedSize, written)
+	}
+
+	return nil
+}
+
+// QobuzDownloadResult contains download result with quality info
+type QobuzDownloadResult struct {
+	FilePath    string
+	BitDepth    int
+	SampleRate  int
+	Title       string
+	Artist      string
+	Album       string
+	ReleaseDate string
+	TrackNumber int
+	DiscNumber  int
+	ISRC        string
 }
 
 // downloadFromQobuz downloads a track using the request parameters
-func downloadFromQobuz(req DownloadRequest) (string, error) {
+func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 	downloader := NewQobuzDownloader()
 
 	// Check for existing file first
 	if existingFile, exists := checkISRCExistsInternal(req.OutputDir, req.ISRC); exists {
-		return "EXISTS:" + existingFile, nil
+		return QobuzDownloadResult{FilePath: "EXISTS:" + existingFile}, nil
 	}
 
+	// Convert expected duration from ms to seconds
+	expectedDurationSec := req.DurationMS / 1000
+
 	var track *QobuzTrack
 	var err error
 
-	// Strategy 1: Search by ISRC
+	// OPTIMIZATION: Check cache first for track ID
 	if req.ISRC != "" {
-		track, err = downloader.SearchTrackByISRC(req.ISRC)
+		if cached := GetTrackIDCache().Get(req.ISRC); cached != nil && cached.QobuzTrackID > 0 {
+			GoLog("[Qobuz] Cache hit! Using cached track ID: %d\n", cached.QobuzTrackID)
+			// For Qobuz we need to search again to get full track info, but we can use the ID
+			track, err = downloader.SearchTrackByISRC(req.ISRC)
+			if err != nil {
+				GoLog("[Qobuz] Cache hit but search failed: %v\n", err)
+				track = nil
+			}
+		}
 	}
 
-	// Strategy 2: Search by metadata
+	// Strategy 1: Search by ISRC with duration verification
+	if track == nil && req.ISRC != "" {
+		GoLog("[Qobuz] Trying ISRC search: %s\n", req.ISRC)
+		track, err = downloader.SearchTrackByISRCWithDuration(req.ISRC, expectedDurationSec)
+		// Verify artist AND title
+		if track != nil {
+			if !qobuzArtistsMatch(req.ArtistName, track.Performer.Name) {
+				GoLog("[Qobuz] Artist mismatch from ISRC search: expected '%s', got '%s'. Rejecting.\n",
+					req.ArtistName, track.Performer.Name)
+				track = nil
+			} else if !qobuzTitlesMatch(req.TrackName, track.Title) {
+				GoLog("[Qobuz] Title mismatch from ISRC search: expected '%s', got '%s'. Rejecting.\n",
+					req.TrackName, track.Title)
+				track = nil
+			}
+		}
+	}
+
+	// Strategy 2: Search by metadata with duration verification (includes title verification)
 	if track == nil {
-		track, err = downloader.SearchTrackByMetadata(req.TrackName, req.ArtistName)
+		track, err = downloader.SearchTrackByMetadataWithDuration(req.TrackName, req.ArtistName, expectedDurationSec)
+		// Verify artist (title already verified in SearchTrackByMetadataWithDuration)
+		if track != nil && !qobuzArtistsMatch(req.ArtistName, track.Performer.Name) {
+			GoLog("[Qobuz] Artist mismatch from metadata search: expected '%s', got '%s'. Rejecting.\n",
+				req.ArtistName, track.Performer.Name)
+			track = nil
+		}
 	}
 
 	if track == nil {
-		errMsg := "could not find track on Qobuz"
+		errMsg := "could not find matching track on Qobuz (artist/duration mismatch)"
 		if err != nil {
 			errMsg = err.Error()
 		}
-		return "", fmt.Errorf("qobuz search failed: %s", errMsg)
+		return QobuzDownloadResult{}, fmt.Errorf("qobuz search failed: %s", errMsg)
+	}
+
+	// Log match found and cache the track ID
+	GoLog("[Qobuz] Match found: '%s' by '%s' (duration: %ds)\n", track.Title, track.Performer.Name, track.Duration)
+	if req.ISRC != "" {
+		GetTrackIDCache().SetQobuz(req.ISRC, track.ID)
 	}
 
 	// Build filename
@@ -357,7 +893,7 @@ func downloadFromQobuz(req DownloadRequest) (string, error) {
 
 	// Check if file already exists
 	if fileInfo, statErr := os.Stat(outputPath); statErr == nil && fileInfo.Size() > 0 {
-		return "EXISTS:" + outputPath, nil
+		return QobuzDownloadResult{FilePath: "EXISTS:" + outputPath}, nil
 	}
 
 	// Map quality from Tidal format to Qobuz format
@@ -372,68 +908,105 @@ func downloadFromQobuz(req DownloadRequest) (string, error) {
 	case "HI_RES_LOSSLESS":
 		qobuzQuality = "27" // 24-bit 192kHz
 	}
-	fmt.Printf("[Qobuz] Using quality: %s (mapped from %s)\n", qobuzQuality, req.Quality)
+	GoLog("[Qobuz] Using quality: %s (mapped from %s)\n", qobuzQuality, req.Quality)
+
+	// Get actual quality from track metadata
+	actualBitDepth := track.MaximumBitDepth
+	actualSampleRate := int(track.MaximumSamplingRate * 1000) // Convert kHz to Hz
+	GoLog("[Qobuz] Actual quality: %d-bit/%.1fkHz\n", actualBitDepth, track.MaximumSamplingRate)
 
 	// Get download URL using parallel API requests
 	downloadURL, err := downloader.GetDownloadURL(track.ID, qobuzQuality)
 	if err != nil {
-		return "", fmt.Errorf("failed to get download URL: %w", err)
+		return QobuzDownloadResult{}, fmt.Errorf("failed to get download URL: %w", err)
 	}
 
-	// Download file with item ID for progress tracking
+	// 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,
+		)
+	}()
+
+	// Download audio file with item ID for progress tracking
 	if err := downloader.DownloadFile(downloadURL, outputPath, req.ItemID); err != nil {
-		return "", fmt.Errorf("download failed: %w", err)
+		return QobuzDownloadResult{}, fmt.Errorf("download failed: %w", err)
+	}
+
+	// Wait for parallel operations to complete
+	<-parallelDone
+
+	// Set progress to 100% and status to finalizing (before embedding)
+	// This makes the UI show "Finalizing..." while embedding happens
+	if req.ItemID != "" {
+		SetItemProgress(req.ItemID, 1.0, 0, 0)
+		SetItemFinalizing(req.ItemID)
+	}
+
+	// Embed metadata using parallel-fetched cover data
+	// Use metadata from the actual Qobuz track found (more accurate than request) but prefer
+	// requested Album Name to avoid ISRC version mismatches (e.g. Compilations vs Original)
+	albumName := track.Album.Title
+	if req.AlbumName != "" {
+		albumName = req.AlbumName
 	}
 
-	// Embed metadata
 	metadata := Metadata{
-		Title:       req.TrackName,
-		Artist:      req.ArtistName,
-		Album:       req.AlbumName,
-		AlbumArtist: req.AlbumArtist,
-		Date:        req.ReleaseDate,
-		TrackNumber: req.TrackNumber,
+		Title:       track.Title,
+		Artist:      track.Performer.Name,
+		Album:       albumName,
+		AlbumArtist: req.AlbumArtist, // Qobuz track struct might not have this handy, keep req or check album struct
+		Date:        track.Album.ReleaseDate,
+		TrackNumber: track.TrackNumber,
 		TotalTracks: req.TotalTracks,
-		DiscNumber:  req.DiscNumber,
-		ISRC:        req.ISRC,
+		DiscNumber:  req.DiscNumber, // QobuzTrack struct usually doesn't have disc info in simple search result
+		ISRC:        track.ISRC,
 	}
 
-	// Download cover to memory (avoids file permission issues on Android)
+	// Use cover data from parallel fetch
 	var coverData []byte
-	if req.CoverURL != "" {
-		fmt.Println("[Qobuz] Downloading cover to memory...")
-		data, err := downloadCoverToMemory(req.CoverURL, req.EmbedMaxQualityCover)
-		if err == nil {
-			coverData = data
-			fmt.Printf("[Qobuz] Cover downloaded successfully (%d bytes)\n", len(coverData))
-		} else {
-			fmt.Printf("[Qobuz] Warning: failed to download cover: %v\n", err)
-		}
+	if parallelResult != nil && parallelResult.CoverData != nil {
+		coverData = parallelResult.CoverData
+		GoLog("[Qobuz] Using parallel-fetched cover (%d bytes)\n", len(coverData))
 	}
 
 	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("[Qobuz] Fetching lyrics...")
-		lyricsClient := NewLyricsClient()
-		lyrics, lyricsErr := lyricsClient.FetchLyricsAllSources(req.SpotifyID, req.TrackName, req.ArtistName)
-		if lyricsErr != nil {
-			fmt.Printf("[Qobuz] Warning: lyrics fetch error: %v\n", lyricsErr)
-		} else if lyrics == nil || len(lyrics.Lines) == 0 {
-			fmt.Println("[Qobuz] No lyrics found for this track")
+	// Embed lyrics from parallel fetch
+	if req.EmbedLyrics && parallelResult != nil && parallelResult.LyricsLRC != "" {
+		GoLog("[Qobuz] Embedding parallel-fetched lyrics (%d lines)...\n", len(parallelResult.LyricsData.Lines))
+		if embedErr := EmbedLyrics(outputPath, parallelResult.LyricsLRC); embedErr != nil {
+			GoLog("[Qobuz] Warning: failed to embed lyrics: %v\n", embedErr)
 		} else {
-			fmt.Printf("[Qobuz] Lyrics found (%d lines), embedding...\n", len(lyrics.Lines))
-			lrcContent := convertToLRC(lyrics)
-			if embedErr := EmbedLyrics(outputPath, lrcContent); embedErr != nil {
-				fmt.Printf("[Qobuz] Warning: failed to embed lyrics: %v\n", embedErr)
-			} else {
-				fmt.Println("[Qobuz] Lyrics embedded successfully")
-			}
+			fmt.Println("[Qobuz] Lyrics embedded successfully")
 		}
+	} else if req.EmbedLyrics {
+		fmt.Println("[Qobuz] No lyrics available from parallel fetch")
 	}
 
-	return outputPath, nil
+	// Add to ISRC index for fast duplicate checking
+	AddToISRCIndex(req.OutputDir, req.ISRC, outputPath)
+
+	return QobuzDownloadResult{
+		FilePath:    outputPath,
+		BitDepth:    actualBitDepth,
+		SampleRate:  actualSampleRate,
+		Title:       track.Title,
+		Artist:      track.Performer.Name,
+		Album:       track.Album.Title,
+		ReleaseDate: track.Album.ReleaseDate,
+		TrackNumber: track.TrackNumber,
+		DiscNumber:  req.DiscNumber, // Qobuz track struct limitations
+		ISRC:        track.ISRC,
+	}, nil
 }

go_backend/romaji.go

@@ -5,109 +5,61 @@ import (
 	"unicode"
 )
 
-// Japanese character ranges
-const (
-	hiraganaStart = 0x3040
-	hiraganaEnd   = 0x309F
-	katakanaStart = 0x30A0
-	katakanaEnd   = 0x30FF
-	kanjiStart    = 0x4E00
-	kanjiEnd      = 0x9FFF
-)
-
-// hiraganaToRomaji maps hiragana characters to romaji
+// Hiragana to Romaji mapping
 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",
-	// W-row
-	'わ': "wa", 'を': "wo",
-	// N
-	'ん': "n",
-	// Voiced (dakuten) - G-row
+	'わ': "wa", 'を': "wo", 'ん': "n",
+	// Dakuten (voiced)
 	'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",
-	// P-row (handakuten)
+	// Handakuten (semi-voiced)
 	'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
+// Katakana to Romaji mapping
 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",
-	// W-row
-	'ワ': "wa", 'ヲ': "wo",
-	// N
-	'ン': "n",
-	// Voiced (dakuten) - G-row
+	'ワ': "wa", 'ヲ': "wo", 'ン': "n",
+	// Dakuten (voiced)
 	'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",
-	// P-row (handakuten)
+	// Handakuten (semi-voiced)
 	'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': "",
 }
 
-// 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{
+// Combination mappings for きゃ, しゃ, etc.
+var combinationHiragana = 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",
@@ -121,7 +73,7 @@ var hiraganaCombo = map[string]string{
 	"ぴゃ": "pya", "ぴゅ": "pyu", "ぴょ": "pyo",
 }
 
-var katakanaCombo = map[string]string{
+var combinationKatakana = 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",
@@ -133,15 +85,13 @@ var katakanaCombo = 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 katakana combinations
-	"ティ": "ti", "ディ": "di",
-	"トゥ": "tu", "ドゥ": "du",
+	// Extended 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)
+// ContainsJapanese checks if a string contains Japanese characters
 func ContainsJapanese(s string) bool {
 	for _, r := range s {
 		if isHiragana(r) || isKatakana(r) || isKanji(r) {
@@ -151,107 +101,72 @@ 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 >= hiraganaStart && r <= hiraganaEnd
+	return r >= 0x3040 && r <= 0x309F
 }
 
 func isKatakana(r rune) bool {
-	return r >= katakanaStart && r <= katakanaEnd
+	return r >= 0x30A0 && r <= 0x30FF
 }
 
 func isKanji(r rune) bool {
-	return r >= kanjiStart && r <= kanjiEnd
+	return (r >= 0x4E00 && r <= 0x9FFF) || // CJK Unified Ideographs
+		(r >= 0x3400 && r <= 0x4DBF) // CJK Unified Ideographs Extension A
 }
 
-// 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
+// JapaneseToRomaji converts Japanese text (hiragana/katakana) to romaji
+// Note: Kanji cannot be converted without a dictionary, so they are kept as-is
+func JapaneseToRomaji(text string) string {
+	if !ContainsJapanese(text) {
+		return text
 	}
 
-	runes := []rune(s)
 	var result strings.Builder
-	result.Grow(len(s) * 2) // Romaji is typically longer
-
+	runes := []rune(text)
 	i := 0
+
 	for i < len(runes) {
-		r := runes[i]
+		// 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
+			}
+			if len(nextRomaji) > 0 {
+				result.WriteByte(nextRomaji[0]) // Double the first consonant
+			}
+			i++
+			continue
+		}
 
-		// Check for two-character combinations first
-		if i+1 < len(runes) {
+		// Check for two-character combinations
+		if i < len(runes)-1 {
 			combo := string(runes[i : i+2])
-			if romaji, ok := hiraganaCombo[combo]; ok {
+			if romaji, ok := combinationHiragana[combo]; ok {
 				result.WriteString(romaji)
 				i += 2
 				continue
 			}
-			if romaji, ok := katakanaCombo[combo]; ok {
+			if romaji, ok := combinationKatakana[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
-		}
-
-		// 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)
-			i++
-			continue
-		}
-
-		if romaji, ok := katakanaToRomaji[r]; ok {
+		} else if romaji, ok := katakanaToRomaji[r]; ok {
 			result.WriteString(romaji)
-			i++
-			continue
-		}
-
-		// Keep non-Japanese characters as-is
-		if unicode.IsSpace(r) {
-			result.WriteRune(' ')
+		} else if isKanji(r) {
+			// Keep kanji as-is (would need dictionary for proper conversion)
+			result.WriteRune(r)
 		} else {
+			// Keep other characters (punctuation, spaces, etc.)
 			result.WriteRune(r)
 		}
 		i++
@@ -260,17 +175,48 @@ func ToRomaji(s string) string {
 	return result.String()
 }
 
-// GetRomajiVariants returns search variants for Japanese text
-// Returns the original string plus romaji version if applicable
-func GetRomajiVariants(s string) []string {
-	variants := []string{s}
+// BuildSearchQuery creates a search query from track name and artist
+// Converts Japanese to romaji if present
+func BuildSearchQuery(trackName, artistName string) string {
+	// Convert Japanese to romaji
+	trackRomaji := JapaneseToRomaji(trackName)
+	artistRomaji := JapaneseToRomaji(artistName)
 
-	if ContainsKana(s) {
-		romaji := ToRomaji(s)
-		if romaji != s && strings.TrimSpace(romaji) != "" {
-			variants = append(variants, romaji)
+	// Clean up the query - remove special characters that might interfere with search
+	trackClean := cleanSearchQuery(trackRomaji)
+	artistClean := cleanSearchQuery(artistRomaji)
+
+	return strings.TrimSpace(artistClean + " " + trackClean)
+}
+
+// cleanSearchQuery removes special characters that might interfere with search
+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)
 		}
 	}
-
-	return variants
+	return strings.TrimSpace(result.String())
+}
+
+// CleanToASCII removes all non-ASCII characters and keeps only letters, numbers, spaces
+// This is useful for creating search queries that work better with Tidal's search
+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)
 }

go_backend/songlink.go

@@ -6,6 +6,8 @@ import (
 	"fmt"
 	"net/http"
 	"net/url"
+	"strings"
+	"sync"
 	"time"
 )
 
@@ -20,20 +22,37 @@ type TrackAvailability struct {
 	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"`
 }
 
-// NewSongLinkClient creates a new SongLink client
+var (
+	// Global SongLink client instance for connection reuse
+	globalSongLinkClient *SongLinkClient
+	songLinkClientOnce   sync.Once
+)
+
+// NewSongLinkClient creates a new SongLink client (returns singleton for connection reuse)
 func NewSongLinkClient() *SongLinkClient {
-	return &SongLinkClient{
-		client: NewHTTPClientWithTimeout(SongLinkTimeout), // 30s timeout
-	}
+	songLinkClientOnce.Do(func() {
+		globalSongLinkClient = &SongLinkClient{
+			client: NewHTTPClientWithTimeout(SongLinkTimeout), // 30s timeout
+		}
+	})
+	return globalSongLinkClient
 }
 
 // CheckTrackAvailability checks track availability on streaming platforms
 func (s *SongLinkClient) CheckTrackAvailability(spotifyTrackID string, isrc string) (*TrackAvailability, error) {
+	// Validate Spotify ID format (should be 22 characters alphanumeric)
+	if spotifyTrackID == "" {
+		return nil, fmt.Errorf("spotify track ID is empty")
+	}
+	
 	// Use global rate limiter - blocks until request is allowed
 	songLinkRateLimiter.WaitForSlot()
 
@@ -57,8 +76,18 @@ func (s *SongLinkClient) CheckTrackAvailability(spotifyTrackID string, isrc stri
 	}
 	defer resp.Body.Close()
 
+	// Handle specific error codes
+	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("API returned status %d", resp.StatusCode)
+		return nil, fmt.Errorf("SongLink API returned status %d", resp.StatusCode)
 	}
 
 	body, err := ReadResponseBody(resp)
@@ -92,7 +121,15 @@ func (s *SongLinkClient) CheckTrackAvailability(spotifyTrackID string, isrc stri
 		availability.AmazonURL = amazonLink.URL
 	}
 
-	// Check Qobuz using ISRC
+	// Check Deezer
+	if deezerLink, ok := songLinkResp.LinksByPlatform["deezer"]; ok && deezerLink.URL != "" {
+		availability.Deezer = true
+		availability.DeezerURL = deezerLink.URL
+		// Extract Deezer ID from URL (e.g., https://www.deezer.com/track/123456)
+		availability.DeezerID = extractDeezerIDFromURL(deezerLink.URL)
+	}
+
+	// Check Qobuz using ISRC (SongLink doesn't support Qobuz directly)
 	if isrc != "" {
 		availability.Qobuz = checkQobuzAvailability(isrc)
 	}
@@ -151,3 +188,357 @@ func checkQobuzAvailability(isrc string) bool {
 
 	return searchResp.Tracks.Total > 0
 }
+
+// extractDeezerIDFromURL extracts Deezer track/album/artist ID from URL
+func extractDeezerIDFromURL(deezerURL string) string {
+	// URL format: https://www.deezer.com/track/123456 or https://www.deezer.com/en/track/123456
+	parts := strings.Split(deezerURL, "/")
+	if len(parts) > 0 {
+		// Get the last part which should be the ID
+		lastPart := parts[len(parts)-1]
+		// Remove any query parameters
+		if idx := strings.Index(lastPart, "?"); idx > 0 {
+			lastPart = lastPart[:idx]
+		}
+		return lastPart
+	}
+	return ""
+}
+
+// GetDeezerIDFromSpotify converts a Spotify track ID to Deezer track ID using SongLink
+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"`
+}
+
+// CheckAlbumAvailability checks album availability on streaming platforms using SongLink
+func (s *SongLinkClient) CheckAlbumAvailability(spotifyAlbumID string) (*AlbumAvailability, error) {
+	// Use global rate limiter
+	songLinkRateLimiter.WaitForSlot()
+
+	// Build API URL for album
+	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)
+	}
+
+	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 := &AlbumAvailability{
+		SpotifyID: spotifyAlbumID,
+	}
+
+	// Check Deezer
+	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
+}
+
+// ========================================
+// Deezer ID Support - Query SongLink using Deezer as source
+// ========================================
+
+// CheckAvailabilityFromDeezer checks track availability using Deezer track ID as source
+// 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")
+	}
+	
+	// Use global rate limiter
+	songLinkRateLimiter.WaitForSlot()
+
+	// Build Deezer URL
+	deezerURL := fmt.Sprintf("https://www.deezer.com/track/%s", deezerTrackID)
+
+	// Build API URL using Deezer URL as source
+	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()
+
+	// Handle specific error codes
+	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,
+	}
+
+	// Check Spotify
+	if spotifyLink, ok := songLinkResp.LinksByPlatform["spotify"]; ok && spotifyLink.URL != "" {
+		// Extract Spotify ID from URL
+		availability.SpotifyID = extractSpotifyIDFromURL(spotifyLink.URL)
+	}
+
+	// Check Tidal
+	if tidalLink, ok := songLinkResp.LinksByPlatform["tidal"]; ok && tidalLink.URL != "" {
+		availability.Tidal = true
+		availability.TidalURL = tidalLink.URL
+	}
+
+	// Check Amazon
+	if amazonLink, ok := songLinkResp.LinksByPlatform["amazonMusic"]; ok && amazonLink.URL != "" {
+		availability.Amazon = true
+		availability.AmazonURL = amazonLink.URL
+	}
+
+	// Check Deezer URL
+	if deezerLink, ok := songLinkResp.LinksByPlatform["deezer"]; ok && deezerLink.URL != "" {
+		availability.DeezerURL = deezerLink.URL
+	}
+
+	return availability, nil
+}
+
+// CheckAvailabilityByPlatform checks track availability using any supported platform
+// 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)
+	}
+	
+	// Use global rate limiter
+	songLinkRateLimiter.WaitForSlot()
+
+	// Build API URL using platform, type, and id parameters (as per API docs)
+	// https://api.song.link/v1-alpha.1/links?platform=deezer&type=song&id=123456
+	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)
+	}
+
+	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()
+
+	// Handle specific error codes
+	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)
+	}
+
+	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{}
+
+	// Check Spotify
+	if spotifyLink, ok := songLinkResp.LinksByPlatform["spotify"]; ok && spotifyLink.URL != "" {
+		availability.SpotifyID = extractSpotifyIDFromURL(spotifyLink.URL)
+	}
+
+	// Check Tidal
+	if tidalLink, ok := songLinkResp.LinksByPlatform["tidal"]; ok && tidalLink.URL != "" {
+		availability.Tidal = true
+		availability.TidalURL = tidalLink.URL
+	}
+
+	// Check Amazon
+	if amazonLink, ok := songLinkResp.LinksByPlatform["amazonMusic"]; ok && amazonLink.URL != "" {
+		availability.Amazon = true
+		availability.AmazonURL = amazonLink.URL
+	}
+
+	// Check Deezer
+	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 {
+	// URL format: https://open.spotify.com/track/0Jcij1eWd5bDMU5iPbxe2i
+	parts := strings.Split(spotifyURL, "/track/")
+	if len(parts) > 1 {
+		// Get the ID part and remove any query parameters
+		idPart := parts[1]
+		if idx := strings.Index(idPart, "?"); idx > 0 {
+			idPart = idPart[:idx]
+		}
+		return idPart
+	}
+	return ""
+}
+
+// GetSpotifyIDFromDeezer converts a Deezer track ID to Spotify track ID using SongLink
+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
+}
+
+// GetAmazonURLFromDeezer converts a Deezer track ID to Amazon Music URL using SongLink
+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
+}

go_backend/spotify.go

@@ -10,6 +10,7 @@ import (
 	"math/rand"
 	"net/http"
 	"net/url"
+	"os"
 	"strings"
 	"sync"
 	"time"
@@ -20,11 +21,28 @@ const (
 	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"
+	
+	// Cache TTL settings
+	artistCacheTTL = 10 * time.Minute
+	searchCacheTTL = 5 * time.Minute
+	albumCacheTTL  = 10 * time.Minute
 )
 
 var errInvalidSpotifyURL = errors.New("invalid or unsupported Spotify URL")
 
+// cacheEntry holds cached data with expiration
+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
@@ -32,31 +50,76 @@ type SpotifyMetadataClient struct {
 	clientSecret   string
 	cachedToken    string
 	tokenExpiresAt time.Time
+	tokenMu        sync.Mutex // Protects token cache for concurrent access
 	rng            *rand.Rand
 	rngMu          sync.Mutex
 	userAgent      string
+	
+	// Caches to reduce API calls
+	artistCache map[string]*cacheEntry // key: artistID
+	searchCache map[string]*cacheEntry // key: query+type
+	albumCache  map[string]*cacheEntry // key: albumID
+	cacheMu     sync.RWMutex
+}
+
+// Custom credentials storage (set from Flutter)
+var (
+	customClientID     string
+	customClientSecret string
+	credentialsMu      sync.RWMutex
+)
+
+// SetSpotifyCredentials sets custom Spotify API credentials
+// Pass empty strings to use default credentials
+func SetSpotifyCredentials(clientID, clientSecret string) {
+	credentialsMu.Lock()
+	defer credentialsMu.Unlock()
+	customClientID = clientID
+	customClientSecret = clientSecret
+}
+
+// getCredentials returns the current credentials (custom or default)
+func getCredentials() (string, string) {
+	credentialsMu.RLock()
+	defer credentialsMu.RUnlock()
+	
+	if customClientID != "" && customClientSecret != "" {
+		return customClientID, customClientSecret
+	}
+	
+	// Fall back to default credentials
+	clientID := os.Getenv("SPOTIFY_CLIENT_ID")
+	if clientID == "" {
+		if decoded, err := base64.StdEncoding.DecodeString("NWY1NzNjOTYyMDQ5NGJhZTg3ODkwYzBmMDhhNjAyOTM="); err == nil {
+			clientID = string(decoded)
+		}
+	}
+
+	clientSecret := os.Getenv("SPOTIFY_CLIENT_SECRET")
+	if clientSecret == "" {
+		if decoded, err := base64.StdEncoding.DecodeString("MjEyNDc2ZDliMGYzNDcyZWFhNzYyZDkwYjE5YjBiYTg="); err == nil {
+			clientSecret = string(decoded)
+		}
+	}
+	
+	return clientID, clientSecret
 }
 
 // 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)
-	}
+	// Get credentials (custom or default)
+	clientID, clientSecret := getCredentials()
 
 	c := &SpotifyMetadataClient{
-		httpClient:   &http.Client{Timeout: 15 * time.Second},
+		httpClient:   NewHTTPClientWithTimeout(15 * time.Second), // Use shared transport for connection pooling
 		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
@@ -131,6 +194,32 @@ type PlaylistResponsePayload struct {
 	TrackList    []AlbumTrackMetadata `json:"track_list"`
 }
 
+// ArtistInfoMetadata holds artist information
+type ArtistInfoMetadata struct {
+	ID         string `json:"id"`
+	Name       string `json:"name"`
+	Images     string `json:"images"`
+	Followers  int    `json:"followers"`
+	Popularity int    `json:"popularity"`
+}
+
+// ArtistAlbumMetadata holds album info for artist discography
+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"` // album, single, compilation
+	Artists     string `json:"artists"`
+}
+
+// ArtistResponsePayload is the response for artist requests
+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"`
@@ -142,6 +231,21 @@ type SearchResult struct {
 	Total  int             `json:"total"`
 }
 
+// SearchArtistResult represents an artist in search results
+type SearchArtistResult struct {
+	ID         string `json:"id"`
+	Name       string `json:"name"`
+	Images     string `json:"images"`
+	Followers  int    `json:"followers"`
+	Popularity int    `json:"popularity"`
+}
+
+// SearchAllResult represents combined search results for tracks and artists
+type SearchAllResult struct {
+	Tracks  []TrackMetadata      `json:"tracks"`
+	Artists []SearchArtistResult `json:"artists"`
+}
+
 type spotifyURI struct {
 	Type string
 	ID   string
@@ -212,6 +316,8 @@ 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)
 	}
@@ -263,6 +369,98 @@ func (c *SpotifyMetadataClient) SearchTracks(ctx context.Context, query string,
 	return result, nil
 }
 
+// SearchAll searches for tracks and artists on Spotify
+func (c *SpotifyMetadataClient) SearchAll(ctx context.Context, query string, trackLimit, artistLimit int) (*SearchAllResult, error) {
+	// Create cache key
+	cacheKey := fmt.Sprintf("all:%s:%d:%d", query, trackLimit, artistLimit)
+	
+	// Check cache first
+	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,
+		})
+	}
+
+	// Limit artists to artistLimit
+	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,
+		})
+	}
+
+	// Store in cache
+	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 {
@@ -289,6 +487,25 @@ func (c *SpotifyMetadataClient) fetchTrack(ctx context.Context, trackID, token s
 }
 
 func (c *SpotifyMetadataClient) fetchAlbum(ctx context.Context, albumID, token string) (*AlbumResponsePayload, error) {
+	// Check cache first
+	c.cacheMu.RLock()
+	if entry, ok := c.albumCache[albumID]; ok && !entry.isExpired() {
+		c.cacheMu.RUnlock()
+		return entry.data.(*AlbumResponsePayload), nil
+	}
+	c.cacheMu.RUnlock()
+
+	// Track item structure for pagination
+	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"`
@@ -296,15 +513,8 @@ func (c *SpotifyMetadataClient) fetchAlbum(ctx context.Context, albumID, token s
 		Images      []image  `json:"images"`
 		Artists     []artist `json:"artists"`
 		Tracks      struct {
-			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"`
+			Items []trackItem `json:"items"`
+			Next  string      `json:"next"`
 		} `json:"tracks"`
 	}
 
@@ -321,10 +531,38 @@ func (c *SpotifyMetadataClient) fetchAlbum(ctx context.Context, albumID, token s
 		Images:      albumImage,
 	}
 
-	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)
+	// Collect all tracks (including paginated)
+	allTrackItems := data.Tracks.Items
+	nextURL := data.Tracks.Next
+	
+	// Fetch remaining tracks using pagination (no limit)
+	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)
+
+	// Collect track IDs for parallel ISRC fetching
+	trackIDs := make([]string, len(allTrackItems))
+	for i, item := range allTrackItems {
+		trackIDs[i] = item.ID
+	}
+
+	// Fetch ISRCs in parallel for ALL tracks (like Deezer implementation)
+	isrcMap := c.fetchISRCsParallel(ctx, trackIDs, token)
+
+	tracks := make([]AlbumTrackMetadata, 0, len(allTrackItems))
+	for _, item := range allTrackItems {
+		isrc := isrcMap[item.ID]
 		
 		tracks = append(tracks, AlbumTrackMetadata{
 			SpotifyID:   item.ID,
@@ -344,13 +582,65 @@ func (c *SpotifyMetadataClient) fetchAlbum(ctx context.Context, albumID, token s
 		})
 	}
 
-	return &AlbumResponsePayload{
+	result := &AlbumResponsePayload{
 		AlbumInfo: info,
 		TrackList: tracks,
-	}, nil
+	}
+
+	// Store in cache
+	c.cacheMu.Lock()
+	c.albumCache[albumID] = &cacheEntry{
+		data:      result,
+		expiresAt: time.Now().Add(albumCacheTTL),
+	}
+	c.cacheMu.Unlock()
+
+	return result, nil
+}
+
+// fetchISRCsParallel fetches ISRCs for multiple tracks in parallel
+// Similar to Deezer implementation for consistency
+func (c *SpotifyMetadataClient) fetchISRCsParallel(ctx context.Context, trackIDs []string, token string) map[string]string {
+	const maxParallelISRC = 10 // Max concurrent ISRC fetches
+	
+	result := make(map[string]string)
+	var resultMu sync.Mutex
+	
+	if len(trackIDs) == 0 {
+		return result
+	}
+	
+	// Use semaphore to limit concurrent requests
+	sem := make(chan struct{}, maxParallelISRC)
+	var wg sync.WaitGroup
+	
+	for _, trackID := range trackIDs {
+		wg.Add(1)
+		go func(id string) {
+			defer wg.Done()
+			
+			// Acquire semaphore
+			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
 }
 
 func (c *SpotifyMetadataClient) fetchPlaylist(ctx context.Context, playlistID, token string) (*PlaylistResponsePayload, error) {
+	// First request to get playlist info and first batch of tracks
 	var data struct {
 		Name   string  `json:"name"`
 		Images []image `json:"images"`
@@ -361,7 +651,8 @@ func (c *SpotifyMetadataClient) fetchPlaylist(ctx context.Context, playlistID, t
 			Items []struct {
 				Track *trackFull `json:"track"`
 			} `json:"items"`
-			Total int `json:"total"`
+			Total int    `json:"total"`
+			Next  string `json:"next"`
 		} `json:"tracks"`
 	}
 
@@ -375,7 +666,10 @@ func (c *SpotifyMetadataClient) fetchPlaylist(ctx context.Context, playlistID, t
 	info.Owner.Name = data.Name
 	info.Owner.Images = firstImageURL(data.Images)
 
-	tracks := make([]AlbumTrackMetadata, 0, len(data.Tracks.Items))
+	// Pre-allocate with expected capacity
+	tracks := make([]AlbumTrackMetadata, 0, data.Tracks.Total)
+	
+	// Add first batch of tracks
 	for _, item := range data.Tracks.Items {
 		if item.Track == nil {
 			continue
@@ -399,12 +693,157 @@ func (c *SpotifyMetadataClient) fetchPlaylist(ctx context.Context, playlistID, t
 		})
 	}
 
+	// Fetch remaining tracks using pagination (NO LIMIT - fetch all tracks)
+	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 {
+			// Log error but return what we have so far
+			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) {
+	// Check cache first
+	c.cacheMu.RLock()
+	if entry, ok := c.artistCache[artistID]; ok && !entry.isExpired() {
+		c.cacheMu.RUnlock()
+		return entry.data.(*ArtistResponsePayload), nil
+	}
+	c.cacheMu.RUnlock()
+
+	// Fetch artist info
+	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,
+	}
+
+	// Fetch artist albums (all types: album, single, compilation)
+	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),
+			})
+		}
+
+		// Check if there are more albums
+		if albumsData.Next == "" || len(albumsData.Items) < limit {
+			break
+		}
+		offset += limit
+
+		// Safety limit to prevent infinite loops
+		if offset > 500 {
+			break
+		}
+	}
+
+	result := &ArtistResponsePayload{
+		ArtistInfo: artistInfo,
+		Albums:     albums,
+	}
+
+	// Store in cache
+	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"`
@@ -465,8 +904,16 @@ func (c *SpotifyMetadataClient) getJSON(ctx context.Context, endpoint, token str
 		return err
 	}
 
+	// Set headers (same as PC version baseHeaders)
 	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)
 	}
@@ -493,13 +940,23 @@ func (c *SpotifyMetadataClient) randomUserAgent() string {
 	c.rngMu.Lock()
 	defer c.rngMu.Unlock()
 
-	chromeMajor := 80 + c.rng.Intn(25)
-	chromeBuild := 3000 + c.rng.Intn(1500)
-	chromePatch := 60 + c.rng.Intn(65)
+	// Use Mac User-Agent format (same as PC version)
+	macMajor := c.rng.Intn(4) + 11    // 11-14
+	macMinor := c.rng.Intn(5) + 4     // 4-8
+	webkitMajor := c.rng.Intn(7) + 530 // 530-536
+	webkitMinor := c.rng.Intn(7) + 30  // 30-36
+	chromeMajor := c.rng.Intn(25) + 80 // 80-104
+	chromeBuild := c.rng.Intn(1500) + 3000 // 3000-4499
+	chromePatch := c.rng.Intn(65) + 60 // 60-124
+	safariMajor := c.rng.Intn(7) + 530 // 530-536
+	safariMinor := c.rng.Intn(6) + 30  // 30-35
 
 	return fmt.Sprintf(
-		"Mozilla/5.0 (Linux; Android 12) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/%d.0.%d.%d Mobile Safari/537.36",
+		"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,
 		chromeMajor, chromeBuild, chromePatch,
+		safariMajor, safariMinor,
 	)
 }
 

ios/Runner.xcodeproj/project.pbxproj

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

ios/Runner/AppDelegate.swift

@@ -66,6 +66,15 @@ 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
@@ -155,7 +164,8 @@ 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 response = GobackendGetLyricsLRC(spotifyId, trackName, artistName, &error)
+            let filePath = args["file_path"] as? String ?? ""
+            let response = GobackendGetLyricsLRC(spotifyId, trackName, artistName, filePath, &error)
             if let error = error { throw error }
             return response
             
@@ -171,6 +181,106 @@ import Gobackend  // Import Go framework
             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 response = GobackendSearchDeezerAll(query, Int(trackLimit), Int(artistLimit), &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 "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 "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 "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
+            
+        // 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
+            
         default:
             throw NSError(
                 domain: "SpotiFLAC",

ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -1,122 +1 @@
-{
-  "images" : [
-    {
-      "size" : "20x20",
-      "idiom" : "iphone",
-      "filename" : "Icon-App-20x20@2x.png",
-      "scale" : "2x"
-    },
-    {
-      "size" : "20x20",
-      "idiom" : "iphone",
-      "filename" : "Icon-App-20x20@3x.png",
-      "scale" : "3x"
-    },
-    {
-      "size" : "29x29",
-      "idiom" : "iphone",
-      "filename" : "Icon-App-29x29@1x.png",
-      "scale" : "1x"
-    },
-    {
-      "size" : "29x29",
-      "idiom" : "iphone",
-      "filename" : "Icon-App-29x29@2x.png",
-      "scale" : "2x"
-    },
-    {
-      "size" : "29x29",
-      "idiom" : "iphone",
-      "filename" : "Icon-App-29x29@3x.png",
-      "scale" : "3x"
-    },
-    {
-      "size" : "40x40",
-      "idiom" : "iphone",
-      "filename" : "Icon-App-40x40@2x.png",
-      "scale" : "2x"
-    },
-    {
-      "size" : "40x40",
-      "idiom" : "iphone",
-      "filename" : "Icon-App-40x40@3x.png",
-      "scale" : "3x"
-    },
-    {
-      "size" : "60x60",
-      "idiom" : "iphone",
-      "filename" : "Icon-App-60x60@2x.png",
-      "scale" : "2x"
-    },
-    {
-      "size" : "60x60",
-      "idiom" : "iphone",
-      "filename" : "Icon-App-60x60@3x.png",
-      "scale" : "3x"
-    },
-    {
-      "size" : "20x20",
-      "idiom" : "ipad",
-      "filename" : "Icon-App-20x20@1x.png",
-      "scale" : "1x"
-    },
-    {
-      "size" : "20x20",
-      "idiom" : "ipad",
-      "filename" : "Icon-App-20x20@2x.png",
-      "scale" : "2x"
-    },
-    {
-      "size" : "29x29",
-      "idiom" : "ipad",
-      "filename" : "Icon-App-29x29@1x.png",
-      "scale" : "1x"
-    },
-    {
-      "size" : "29x29",
-      "idiom" : "ipad",
-      "filename" : "Icon-App-29x29@2x.png",
-      "scale" : "2x"
-    },
-    {
-      "size" : "40x40",
-      "idiom" : "ipad",
-      "filename" : "Icon-App-40x40@1x.png",
-      "scale" : "1x"
-    },
-    {
-      "size" : "40x40",
-      "idiom" : "ipad",
-      "filename" : "Icon-App-40x40@2x.png",
-      "scale" : "2x"
-    },
-    {
-      "size" : "76x76",
-      "idiom" : "ipad",
-      "filename" : "Icon-App-76x76@1x.png",
-      "scale" : "1x"
-    },
-    {
-      "size" : "76x76",
-      "idiom" : "ipad",
-      "filename" : "Icon-App-76x76@2x.png",
-      "scale" : "2x"
-    },
-    {
-      "size" : "83.5x83.5",
-      "idiom" : "ipad",
-      "filename" : "Icon-App-83.5x83.5@2x.png",
-      "scale" : "2x"
-    },
-    {
-      "size" : "1024x1024",
-      "idiom" : "ios-marketing",
-      "filename" : "Icon-App-1024x1024@1x.png",
-      "scale" : "1x"
-    }
-  ],
-  "info" : {
-    "version" : 1,
-    "author" : "xcode"
-  }
-}
+{"images":[{"size":"20x20","idiom":"iphone","filename":"Icon-App-20x20@2x.png","scale":"2x"},{"size":"20x20","idiom":"iphone","filename":"Icon-App-20x20@3x.png","scale":"3x"},{"size":"29x29","idiom":"iphone","filename":"Icon-App-29x29@1x.png","scale":"1x"},{"size":"29x29","idiom":"iphone","filename":"Icon-App-29x29@2x.png","scale":"2x"},{"size":"29x29","idiom":"iphone","filename":"Icon-App-29x29@3x.png","scale":"3x"},{"size":"40x40","idiom":"iphone","filename":"Icon-App-40x40@2x.png","scale":"2x"},{"size":"40x40","idiom":"iphone","filename":"Icon-App-40x40@3x.png","scale":"3x"},{"size":"57x57","idiom":"iphone","filename":"Icon-App-57x57@1x.png","scale":"1x"},{"size":"57x57","idiom":"iphone","filename":"Icon-App-57x57@2x.png","scale":"2x"},{"size":"60x60","idiom":"iphone","filename":"Icon-App-60x60@2x.png","scale":"2x"},{"size":"60x60","idiom":"iphone","filename":"Icon-App-60x60@3x.png","scale":"3x"},{"size":"20x20","idiom":"ipad","filename":"Icon-App-20x20@1x.png","scale":"1x"},{"size":"20x20","idiom":"ipad","filename":"Icon-App-20x20@2x.png","scale":"2x"},{"size":"29x29","idiom":"ipad","filename":"Icon-App-29x29@1x.png","scale":"1x"},{"size":"29x29","idiom":"ipad","filename":"Icon-App-29x29@2x.png","scale":"2x"},{"size":"40x40","idiom":"ipad","filename":"Icon-App-40x40@1x.png","scale":"1x"},{"size":"40x40","idiom":"ipad","filename":"Icon-App-40x40@2x.png","scale":"2x"},{"size":"50x50","idiom":"ipad","filename":"Icon-App-50x50@1x.png","scale":"1x"},{"size":"50x50","idiom":"ipad","filename":"Icon-App-50x50@2x.png","scale":"2x"},{"size":"72x72","idiom":"ipad","filename":"Icon-App-72x72@1x.png","scale":"1x"},{"size":"72x72","idiom":"ipad","filename":"Icon-App-72x72@2x.png","scale":"2x"},{"size":"76x76","idiom":"ipad","filename":"Icon-App-76x76@1x.png","scale":"1x"},{"size":"76x76","idiom":"ipad","filename":"Icon-App-76x76@2x.png","scale":"2x"},{"size":"83.5x83.5","idiom":"ipad","filename":"Icon-App-83.5x83.5@2x.png","scale":"2x"},{"size":"1024x1024","idiom":"ios-marketing","filename":"Icon-App-1024x1024@1x.png","scale":"1x"}],"info":{"version":1,"author":"xcode"}}

lib/constants/app_info.dart

@@ -1,10 +1,11 @@
 /// App version and info constants
 /// Update version here only - all other files will reference this
 class AppInfo {
-  static const String version = '1.5.0';
-  static const String buildNumber = '14';
+  static const String version = '2.2.5';
+  static const String buildNumber = '47';
   static const String fullVersion = '$version+$buildNumber';
   
+  
   static const String appName = 'SpotiFLAC';
   static const String copyright = '© 2026 SpotiFLAC';
   
@@ -14,4 +15,6 @@ class AppInfo {
   static const String githubRepo = 'zarzet/SpotiFLAC-Mobile';
   static const String githubUrl = 'https://github.com/$githubRepo';
   static const String originalGithubUrl = 'https://github.com/afkarxyz/SpotiFLAC';
+  
+  static const String kofiUrl = 'https://ko-fi.com/zarzet';
 }

lib/main.dart

@@ -3,6 +3,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:spotiflac_android/app.dart';
 import 'package:spotiflac_android/providers/download_queue_provider.dart';
 import 'package:spotiflac_android/services/notification_service.dart';
+import 'package:spotiflac_android/services/share_intent_service.dart';
 
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
@@ -10,6 +11,9 @@ void main() async {
   // Initialize notification service
   await NotificationService().initialize();
   
+  // Initialize share intent service
+  await ShareIntentService().initialize();
+  
   runApp(
     ProviderScope(
       child: const _EagerInitialization(

lib/models/download_item.dart

@@ -7,11 +7,20 @@ part 'download_item.g.dart';
 enum DownloadStatus {
   queued,
   downloading,
+  finalizing, // Embedding metadata, cover, lyrics
   completed,
   failed,
   skipped,
 }
 
+/// Error type enum for better error handling
+enum DownloadErrorType {
+  unknown,
+  notFound,    // Track not found on any service
+  rateLimit,   // Rate limited by service
+  network,     // Network/connection error
+}
+
 @JsonSerializable()
 class DownloadItem {
   final String id;
@@ -19,9 +28,12 @@ class DownloadItem {
   final String service;
   final DownloadStatus status;
   final double progress;
+  final double speedMBps; // Download speed in MB/s
   final String? filePath;
   final String? error;
+  final DownloadErrorType? errorType;
   final DateTime createdAt;
+  final String? qualityOverride; // Override quality for this specific download
 
   const DownloadItem({
     required this.id,
@@ -29,9 +41,12 @@ class DownloadItem {
     required this.service,
     this.status = DownloadStatus.queued,
     this.progress = 0.0,
+    this.speedMBps = 0.0,
     this.filePath,
     this.error,
+    this.errorType,
     required this.createdAt,
+    this.qualityOverride,
   });
 
   DownloadItem copyWith({
@@ -40,9 +55,12 @@ class DownloadItem {
     String? service,
     DownloadStatus? status,
     double? progress,
+    double? speedMBps,
     String? filePath,
     String? error,
+    DownloadErrorType? errorType,
     DateTime? createdAt,
+    String? qualityOverride,
   }) {
     return DownloadItem(
       id: id ?? this.id,
@@ -50,12 +68,31 @@ class DownloadItem {
       service: service ?? this.service,
       status: status ?? this.status,
       progress: progress ?? this.progress,
+      speedMBps: speedMBps ?? this.speedMBps,
       filePath: filePath ?? this.filePath,
       error: error ?? this.error,
+      errorType: errorType ?? this.errorType,
       createdAt: createdAt ?? this.createdAt,
+      qualityOverride: qualityOverride ?? this.qualityOverride,
     );
   }
 
+  /// Get user-friendly error message based on error type
+  String get errorMessage {
+    if (error == null) return '';
+    
+    switch (errorType) {
+      case DownloadErrorType.notFound:
+        return 'Song not found on any service';
+      case DownloadErrorType.rateLimit:
+        return 'Rate limit reached, try again later';
+      case DownloadErrorType.network:
+        return 'Connection failed, check your internet';
+      default:
+        return error ?? 'An error occurred';
+    }
+  }
+
   factory DownloadItem.fromJson(Map<String, dynamic> json) =>
       _$DownloadItemFromJson(json);
   Map<String, dynamic> toJson() => _$DownloadItemToJson(this);

lib/models/download_item.g.dart

@@ -14,9 +14,12 @@ DownloadItem _$DownloadItemFromJson(Map<String, dynamic> json) => DownloadItem(
       $enumDecodeNullable(_$DownloadStatusEnumMap, json['status']) ??
       DownloadStatus.queued,
   progress: (json['progress'] as num?)?.toDouble() ?? 0.0,
+  speedMBps: (json['speedMBps'] as num?)?.toDouble() ?? 0.0,
   filePath: json['filePath'] as String?,
   error: json['error'] as String?,
+  errorType: $enumDecodeNullable(_$DownloadErrorTypeEnumMap, json['errorType']),
   createdAt: DateTime.parse(json['createdAt'] as String),
+  qualityOverride: json['qualityOverride'] as String?,
 );
 
 Map<String, dynamic> _$DownloadItemToJson(DownloadItem instance) =>
@@ -26,15 +29,26 @@ Map<String, dynamic> _$DownloadItemToJson(DownloadItem instance) =>
       'service': instance.service,
       'status': _$DownloadStatusEnumMap[instance.status]!,
       'progress': instance.progress,
+      'speedMBps': instance.speedMBps,
       'filePath': instance.filePath,
       'error': instance.error,
+      'errorType': _$DownloadErrorTypeEnumMap[instance.errorType],
       'createdAt': instance.createdAt.toIso8601String(),
+      'qualityOverride': instance.qualityOverride,
     };
 
 const _$DownloadStatusEnumMap = {
   DownloadStatus.queued: 'queued',
   DownloadStatus.downloading: 'downloading',
+  DownloadStatus.finalizing: 'finalizing',
   DownloadStatus.completed: 'completed',
   DownloadStatus.failed: 'failed',
   DownloadStatus.skipped: 'skipped',
 };
+
+const _$DownloadErrorTypeEnumMap = {
+  DownloadErrorType.unknown: 'unknown',
+  DownloadErrorType.notFound: 'notFound',
+  DownloadErrorType.rateLimit: 'rateLimit',
+  DownloadErrorType.network: 'network',
+};

lib/models/settings.dart

@@ -14,6 +14,16 @@ class AppSettings {
   final bool isFirstLaunch;
   final int concurrentDownloads; // 1 = sequential (default), max 3
   final bool checkForUpdates; // Check for updates on app start
+  final String updateChannel; // stable, preview
+  final bool hasSearchedBefore; // Hide helper text after first search
+  final String folderOrganization; // none, artist, album, artist_album
+  final String historyViewMode; // list, grid
+  final bool askQualityBeforeDownload; // Show quality picker before each download
+  final String spotifyClientId; // Custom Spotify client ID (empty = use default)
+  final String spotifyClientSecret; // Custom Spotify client secret (empty = use default)
+  final bool useCustomSpotifyCredentials; // Whether to use custom credentials (if set)
+  final String metadataSource; // spotify, deezer - source for search and metadata
+  final bool enableLogging; // Enable detailed logging for debugging
 
   const AppSettings({
     this.defaultService = 'tidal',
@@ -26,6 +36,16 @@ class AppSettings {
     this.isFirstLaunch = true,
     this.concurrentDownloads = 1, // Default: sequential (off)
     this.checkForUpdates = true, // Default: enabled
+    this.updateChannel = 'stable', // Default: stable releases only
+    this.hasSearchedBefore = false, // Default: show helper text
+    this.folderOrganization = 'none', // Default: no folder organization
+    this.historyViewMode = 'grid', // Default: grid view
+    this.askQualityBeforeDownload = true, // Default: ask quality before download
+    this.spotifyClientId = '', // Default: use built-in credentials
+    this.spotifyClientSecret = '', // Default: use built-in credentials
+    this.useCustomSpotifyCredentials = true, // Default: use custom if set
+    this.metadataSource = 'deezer', // Default: Deezer (no rate limit)
+    this.enableLogging = false, // Default: disabled for performance
   });
 
   AppSettings copyWith({
@@ -39,6 +59,16 @@ class AppSettings {
     bool? isFirstLaunch,
     int? concurrentDownloads,
     bool? checkForUpdates,
+    String? updateChannel,
+    bool? hasSearchedBefore,
+    String? folderOrganization,
+    String? historyViewMode,
+    bool? askQualityBeforeDownload,
+    String? spotifyClientId,
+    String? spotifyClientSecret,
+    bool? useCustomSpotifyCredentials,
+    String? metadataSource,
+    bool? enableLogging,
   }) {
     return AppSettings(
       defaultService: defaultService ?? this.defaultService,
@@ -51,6 +81,16 @@ class AppSettings {
       isFirstLaunch: isFirstLaunch ?? this.isFirstLaunch,
       concurrentDownloads: concurrentDownloads ?? this.concurrentDownloads,
       checkForUpdates: checkForUpdates ?? this.checkForUpdates,
+      updateChannel: updateChannel ?? this.updateChannel,
+      hasSearchedBefore: hasSearchedBefore ?? this.hasSearchedBefore,
+      folderOrganization: folderOrganization ?? this.folderOrganization,
+      historyViewMode: historyViewMode ?? this.historyViewMode,
+      askQualityBeforeDownload: askQualityBeforeDownload ?? this.askQualityBeforeDownload,
+      spotifyClientId: spotifyClientId ?? this.spotifyClientId,
+      spotifyClientSecret: spotifyClientSecret ?? this.spotifyClientSecret,
+      useCustomSpotifyCredentials: useCustomSpotifyCredentials ?? this.useCustomSpotifyCredentials,
+      metadataSource: metadataSource ?? this.metadataSource,
+      enableLogging: enableLogging ?? this.enableLogging,
     );
   }
 

lib/models/settings.g.dart

@@ -17,6 +17,17 @@ AppSettings _$AppSettingsFromJson(Map<String, dynamic> json) => AppSettings(
   isFirstLaunch: json['isFirstLaunch'] as bool? ?? true,
   concurrentDownloads: (json['concurrentDownloads'] as num?)?.toInt() ?? 1,
   checkForUpdates: json['checkForUpdates'] as bool? ?? true,
+  updateChannel: json['updateChannel'] as String? ?? 'stable',
+  hasSearchedBefore: json['hasSearchedBefore'] as bool? ?? false,
+  folderOrganization: json['folderOrganization'] as String? ?? 'none',
+  historyViewMode: json['historyViewMode'] as String? ?? 'grid',
+  askQualityBeforeDownload: json['askQualityBeforeDownload'] as bool? ?? true,
+  spotifyClientId: json['spotifyClientId'] as String? ?? '',
+  spotifyClientSecret: json['spotifyClientSecret'] as String? ?? '',
+  useCustomSpotifyCredentials:
+      json['useCustomSpotifyCredentials'] as bool? ?? true,
+  metadataSource: json['metadataSource'] as String? ?? 'deezer',
+  enableLogging: json['enableLogging'] as bool? ?? false,
 );
 
 Map<String, dynamic> _$AppSettingsToJson(AppSettings instance) =>
@@ -31,4 +42,14 @@ Map<String, dynamic> _$AppSettingsToJson(AppSettings instance) =>
       'isFirstLaunch': instance.isFirstLaunch,
       'concurrentDownloads': instance.concurrentDownloads,
       'checkForUpdates': instance.checkForUpdates,
+      'updateChannel': instance.updateChannel,
+      'hasSearchedBefore': instance.hasSearchedBefore,
+      'folderOrganization': instance.folderOrganization,
+      'historyViewMode': instance.historyViewMode,
+      'askQualityBeforeDownload': instance.askQualityBeforeDownload,
+      'spotifyClientId': instance.spotifyClientId,
+      'spotifyClientSecret': instance.spotifyClientSecret,
+      'useCustomSpotifyCredentials': instance.useCustomSpotifyCredentials,
+      'metadataSource': instance.metadataSource,
+      'enableLogging': instance.enableLogging,
     };

lib/models/theme_settings.dart

@@ -4,6 +4,7 @@ import 'package:flutter/material.dart';
 const String kThemeModeKey = 'theme_mode';
 const String kUseDynamicColorKey = 'use_dynamic_color';
 const String kSeedColorKey = 'seed_color';
+const String kUseAmoledKey = 'use_amoled';
 
 /// Default Spotify green color for fallback
 const int kDefaultSeedColor = 0xFF1DB954;
@@ -13,11 +14,13 @@ class ThemeSettings {
   final ThemeMode themeMode;
   final bool useDynamicColor;
   final int seedColorValue;
+  final bool useAmoled; // Pure black background for OLED screens
 
   const ThemeSettings({
     this.themeMode = ThemeMode.system,
     this.useDynamicColor = true,
     this.seedColorValue = kDefaultSeedColor,
+    this.useAmoled = false,
   });
 
   /// Get seed color as Color object
@@ -28,11 +31,13 @@ class ThemeSettings {
     ThemeMode? themeMode,
     bool? useDynamicColor,
     int? seedColorValue,
+    bool? useAmoled,
   }) {
     return ThemeSettings(
       themeMode: themeMode ?? this.themeMode,
       useDynamicColor: useDynamicColor ?? this.useDynamicColor,
       seedColorValue: seedColorValue ?? this.seedColorValue,
+      useAmoled: useAmoled ?? this.useAmoled,
     );
   }
 
@@ -41,6 +46,7 @@ class ThemeSettings {
         kThemeModeKey: themeMode.name,
         kUseDynamicColorKey: useDynamicColor,
         kSeedColorKey: seedColorValue,
+        kUseAmoledKey: useAmoled,
       };
 
   /// Create from JSON map
@@ -49,6 +55,7 @@ class ThemeSettings {
       themeMode: _themeModeFromString(json[kThemeModeKey] as String?),
       useDynamicColor: json[kUseDynamicColorKey] as bool? ?? true,
       seedColorValue: json[kSeedColorKey] as int? ?? kDefaultSeedColor,
+      useAmoled: json[kUseAmoledKey] as bool? ?? false,
     );
   }
 
@@ -58,12 +65,13 @@ class ThemeSettings {
     return other is ThemeSettings &&
         other.themeMode == themeMode &&
         other.useDynamicColor == useDynamicColor &&
-        other.seedColorValue == seedColorValue;
+        other.seedColorValue == seedColorValue &&
+        other.useAmoled == useAmoled;
   }
 
   @override
   int get hashCode =>
-      themeMode.hashCode ^ useDynamicColor.hashCode ^ seedColorValue.hashCode;
+      themeMode.hashCode ^ useDynamicColor.hashCode ^ seedColorValue.hashCode ^ useAmoled.hashCode;
 }
 
 /// Helper to convert string to ThemeMode

lib/models/track.dart

@@ -16,6 +16,7 @@ class Track {
   final int? trackNumber;
   final int? discNumber;
   final String? releaseDate;
+  final String? deezerId;
   final ServiceAvailability? availability;
 
   const Track({
@@ -30,6 +31,7 @@ class Track {
     this.trackNumber,
     this.discNumber,
     this.releaseDate,
+    this.deezerId,
     this.availability,
   });
 
@@ -42,17 +44,23 @@ class ServiceAvailability {
   final bool tidal;
   final bool qobuz;
   final bool amazon;
+  final bool deezer;
   final String? tidalUrl;
   final String? qobuzUrl;
   final String? amazonUrl;
+  final String? deezerUrl;
+  final String? deezerId;
 
   const ServiceAvailability({
     this.tidal = false,
     this.qobuz = false,
     this.amazon = false,
+    this.deezer = false,
     this.tidalUrl,
     this.qobuzUrl,
     this.amazonUrl,
+    this.deezerUrl,
+    this.deezerId,
   });
 
   factory ServiceAvailability.fromJson(Map<String, dynamic> json) =>

lib/models/track.g.dart

@@ -18,6 +18,7 @@ Track _$TrackFromJson(Map<String, dynamic> json) => Track(
   trackNumber: (json['trackNumber'] as num?)?.toInt(),
   discNumber: (json['discNumber'] as num?)?.toInt(),
   releaseDate: json['releaseDate'] as String?,
+  deezerId: json['deezerId'] as String?,
   availability: json['availability'] == null
       ? null
       : ServiceAvailability.fromJson(
@@ -37,6 +38,7 @@ Map<String, dynamic> _$TrackToJson(Track instance) => <String, dynamic>{
   'trackNumber': instance.trackNumber,
   'discNumber': instance.discNumber,
   'releaseDate': instance.releaseDate,
+  'deezerId': instance.deezerId,
   'availability': instance.availability,
 };
 
@@ -45,9 +47,12 @@ ServiceAvailability _$ServiceAvailabilityFromJson(Map<String, dynamic> json) =>
       tidal: json['tidal'] as bool? ?? false,
       qobuz: json['qobuz'] as bool? ?? false,
       amazon: json['amazon'] as bool? ?? false,
+      deezer: json['deezer'] as bool? ?? false,
       tidalUrl: json['tidalUrl'] as String?,
       qobuzUrl: json['qobuzUrl'] as String?,
       amazonUrl: json['amazonUrl'] as String?,
+      deezerUrl: json['deezerUrl'] as String?,
+      deezerId: json['deezerId'] as String?,
     );
 
 Map<String, dynamic> _$ServiceAvailabilityToJson(
@@ -56,7 +61,10 @@ Map<String, dynamic> _$ServiceAvailabilityToJson(
   'tidal': instance.tidal,
   'qobuz': instance.qobuz,
   'amazon': instance.amazon,
+  'deezer': instance.deezer,
   'tidalUrl': instance.tidalUrl,
   'qobuzUrl': instance.qobuzUrl,
   'amazonUrl': instance.amazonUrl,
+  'deezerUrl': instance.deezerUrl,
+  'deezerId': instance.deezerId,
 };

lib/providers/settings_provider.dart

@@ -2,8 +2,12 @@ import 'dart:convert';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import 'package:spotiflac_android/models/settings.dart';
+import 'package:spotiflac_android/services/platform_bridge.dart';
+import 'package:spotiflac_android/utils/logger.dart';
 
 const _settingsKey = 'app_settings';
+const _migrationVersionKey = 'settings_migration_version';
+const _currentMigrationVersion = 1;
 
 class SettingsNotifier extends Notifier<AppSettings> {
   @override
@@ -17,6 +21,35 @@ class SettingsNotifier extends Notifier<AppSettings> {
     final json = prefs.getString(_settingsKey);
     if (json != null) {
       state = AppSettings.fromJson(jsonDecode(json));
+      
+      // Run migrations if needed
+      await _runMigrations(prefs);
+      
+      // Apply Spotify credentials to Go backend on load
+      _applySpotifyCredentials();
+      
+      // Sync logging state
+      LogBuffer.loggingEnabled = state.enableLogging;
+    }
+  }
+
+  /// Run one-time migrations for settings
+  Future<void> _runMigrations(SharedPreferences prefs) async {
+    final lastMigration = prefs.getInt(_migrationVersionKey) ?? 0;
+    
+    if (lastMigration < 1) {
+      // Migration 1: Set metadataSource to 'deezer' for existing users
+      // Only apply if user hasn't enabled custom Spotify credentials
+      // (users with custom credentials likely prefer Spotify)
+      if (!state.useCustomSpotifyCredentials) {
+        state = state.copyWith(metadataSource: 'deezer');
+        await _saveSettings();
+      }
+    }
+    
+    // Save current migration version
+    if (lastMigration < _currentMigrationVersion) {
+      await prefs.setInt(_migrationVersionKey, _currentMigrationVersion);
     }
   }
 
@@ -25,6 +58,22 @@ class SettingsNotifier extends Notifier<AppSettings> {
     await prefs.setString(_settingsKey, jsonEncode(state.toJson()));
   }
 
+  /// Apply current Spotify credentials to Go backend
+  Future<void> _applySpotifyCredentials() async {
+    // Only apply custom credentials if enabled and both fields are set
+    if (state.useCustomSpotifyCredentials && 
+        state.spotifyClientId.isNotEmpty && 
+        state.spotifyClientSecret.isNotEmpty) {
+      await PlatformBridge.setSpotifyCredentials(
+        state.spotifyClientId,
+        state.spotifyClientSecret,
+      );
+    } else {
+      // Clear to use default
+      await PlatformBridge.setSpotifyCredentials('', '');
+    }
+  }
+
   void setDefaultService(String service) {
     state = state.copyWith(defaultService: service);
     _saveSettings();
@@ -76,6 +125,79 @@ class SettingsNotifier extends Notifier<AppSettings> {
     state = state.copyWith(checkForUpdates: enabled);
     _saveSettings();
   }
+
+  void setUpdateChannel(String channel) {
+    state = state.copyWith(updateChannel: channel);
+    _saveSettings();
+  }
+
+  void setHasSearchedBefore() {
+    if (!state.hasSearchedBefore) {
+      state = state.copyWith(hasSearchedBefore: true);
+      _saveSettings();
+    }
+  }
+
+  void setFolderOrganization(String organization) {
+    state = state.copyWith(folderOrganization: organization);
+    _saveSettings();
+  }
+
+  void setHistoryViewMode(String mode) {
+    state = state.copyWith(historyViewMode: mode);
+    _saveSettings();
+  }
+
+  void setAskQualityBeforeDownload(bool enabled) {
+    state = state.copyWith(askQualityBeforeDownload: enabled);
+    _saveSettings();
+  }
+
+  void setSpotifyClientId(String clientId) {
+    state = state.copyWith(spotifyClientId: clientId);
+    _saveSettings();
+  }
+
+  void setSpotifyClientSecret(String clientSecret) {
+    state = state.copyWith(spotifyClientSecret: clientSecret);
+    _saveSettings();
+  }
+
+  void setSpotifyCredentials(String clientId, String clientSecret) {
+    state = state.copyWith(
+      spotifyClientId: clientId,
+      spotifyClientSecret: clientSecret,
+    );
+    _saveSettings();
+    _applySpotifyCredentials();
+  }
+
+  void clearSpotifyCredentials() {
+    state = state.copyWith(
+      spotifyClientId: '',
+      spotifyClientSecret: '',
+    );
+    _saveSettings();
+    _applySpotifyCredentials();
+  }
+
+  void setUseCustomSpotifyCredentials(bool enabled) {
+    state = state.copyWith(useCustomSpotifyCredentials: enabled);
+    _saveSettings();
+    _applySpotifyCredentials();
+  }
+
+  void setMetadataSource(String source) {
+    state = state.copyWith(metadataSource: source);
+    _saveSettings();
+  }
+
+  void setEnableLogging(bool enabled) {
+    state = state.copyWith(enableLogging: enabled);
+    _saveSettings();
+    // Sync logging state to LogBuffer
+    LogBuffer.loggingEnabled = enabled;
+  }
 }
 
 final settingsProvider = NotifierProvider<SettingsNotifier, AppSettings>(

lib/providers/theme_provider.dart

@@ -24,11 +24,13 @@ class ThemeNotifier extends Notifier<ThemeSettings> {
       final modeString = prefs.getString(kThemeModeKey);
       final useDynamic = prefs.getBool(kUseDynamicColorKey);
       final seedColor = prefs.getInt(kSeedColorKey);
+      final useAmoled = prefs.getBool(kUseAmoledKey);
 
       state = ThemeSettings(
         themeMode: _themeModeFromString(modeString),
         useDynamicColor: useDynamic ?? true,
         seedColorValue: seedColor ?? kDefaultSeedColor,
+        useAmoled: useAmoled ?? false,
       );
     } catch (e) {
       debugPrint('Error loading theme settings: $e');
@@ -43,6 +45,7 @@ class ThemeNotifier extends Notifier<ThemeSettings> {
       await prefs.setString(kThemeModeKey, state.themeMode.name);
       await prefs.setBool(kUseDynamicColorKey, state.useDynamicColor);
       await prefs.setInt(kSeedColorKey, state.seedColorValue);
+      await prefs.setBool(kUseAmoledKey, state.useAmoled);
     } catch (e) {
       debugPrint('Error saving theme settings: $e');
     }
@@ -72,6 +75,12 @@ class ThemeNotifier extends Notifier<ThemeSettings> {
     await _saveToStorage();
   }
 
+  /// Enable or disable AMOLED mode (pure black background)
+  Future<void> setUseAmoled(bool value) async {
+    state = state.copyWith(useAmoled: value);
+    await _saveToStorage();
+  }
+
   /// Helper to convert string to ThemeMode
   ThemeMode _themeModeFromString(String? value) {
     if (value == null) return ThemeMode.system;

lib/providers/track_provider.dart

@@ -6,107 +6,269 @@ class TrackState {
   final List<Track> tracks;
   final bool isLoading;
   final String? error;
+  final String? albumId;
   final String? albumName;
   final String? playlistName;
+  final String? artistId;
+  final String? artistName;
   final String? coverUrl;
+  final List<ArtistAlbum>? artistAlbums; // For artist page
+  final List<SearchArtist>? searchArtists; // For search results
+  final bool hasSearchText; // For back button handling
 
   const TrackState({
     this.tracks = const [],
     this.isLoading = false,
     this.error,
+    this.albumId,
     this.albumName,
     this.playlistName,
+    this.artistId,
+    this.artistName,
     this.coverUrl,
+    this.artistAlbums,
+    this.searchArtists,
+    this.hasSearchText = false,
   });
 
+  bool get hasContent => tracks.isNotEmpty || artistAlbums != null || (searchArtists != null && searchArtists!.isNotEmpty);
+
   TrackState copyWith({
     List<Track>? tracks,
     bool? isLoading,
     String? error,
+    String? albumId,
     String? albumName,
     String? playlistName,
+    String? artistId,
+    String? artistName,
     String? coverUrl,
+    List<ArtistAlbum>? artistAlbums,
+    List<SearchArtist>? searchArtists,
+    bool? hasSearchText,
   }) {
     return TrackState(
       tracks: tracks ?? this.tracks,
       isLoading: isLoading ?? this.isLoading,
       error: error,
+      albumId: albumId ?? this.albumId,
       albumName: albumName ?? this.albumName,
       playlistName: playlistName ?? this.playlistName,
+      artistId: artistId ?? this.artistId,
+      artistName: artistName ?? this.artistName,
       coverUrl: coverUrl ?? this.coverUrl,
+      artistAlbums: artistAlbums ?? this.artistAlbums,
+      searchArtists: searchArtists ?? this.searchArtists,
+      hasSearchText: hasSearchText ?? this.hasSearchText,
     );
   }
 }
 
+/// Represents an album in artist discography
+class ArtistAlbum {
+  final String id;
+  final String name;
+  final String releaseDate;
+  final int totalTracks;
+  final String? coverUrl;
+  final String albumType; // album, single, compilation
+  final String artists;
+
+  const ArtistAlbum({
+    required this.id,
+    required this.name,
+    required this.releaseDate,
+    required this.totalTracks,
+    this.coverUrl,
+    required this.albumType,
+    required this.artists,
+  });
+}
+
+/// Represents an artist in search results
+class SearchArtist {
+  final String id;
+  final String name;
+  final String? imageUrl;
+  final int followers;
+  final int popularity;
+
+  const SearchArtist({
+    required this.id,
+    required this.name,
+    this.imageUrl,
+    required this.followers,
+    required this.popularity,
+  });
+}
+
 class TrackNotifier extends Notifier<TrackState> {
+  /// Request ID to track and cancel outdated requests
+  int _currentRequestId = 0;
+
   @override
   TrackState build() {
     return const TrackState();
   }
 
-  Future<void> fetchFromUrl(String url) async {
-    state = state.copyWith(isLoading: true, error: null);
+  /// Check if request is still valid (not cancelled by newer request)
+  bool _isRequestValid(int requestId) => requestId == _currentRequestId;
+
+  Future<void> fetchFromUrl(String url, {bool useDeezerFallback = true}) async {
+    // Increment request ID to cancel any pending requests
+    final requestId = ++_currentRequestId;
+
+    // Preserve hasSearchText during fetch
+    state = TrackState(isLoading: true, hasSearchText: state.hasSearchText);
 
     try {
       final parsed = await PlatformBridge.parseSpotifyUrl(url);
+      if (!_isRequestValid(requestId)) return; // Request cancelled
+      
       final type = parsed['type'] as String;
 
-      final metadata = await PlatformBridge.getSpotifyMetadata(url);
+      // Use the new fallback-enabled method
+      Map<String, dynamic> metadata;
+      
+      try {
+        // ignore: avoid_print
+        print('[FetchURL] Fetching $type with Deezer fallback enabled...');
+        metadata = await PlatformBridge.getSpotifyMetadataWithFallback(url);
+        // ignore: avoid_print
+        print('[FetchURL] Metadata fetch success');
+      } catch (e) {
+        // If fallback also fails, show error
+        // ignore: avoid_print
+        print('[FetchURL] Metadata fetch failed: $e');
+        rethrow;
+      }
+      
+      if (!_isRequestValid(requestId)) return; // Request cancelled
 
       if (type == 'track') {
         final trackData = metadata['track'] as Map<String, dynamic>;
         final track = _parseTrack(trackData);
-        state = state.copyWith(
+        state = TrackState(
           tracks: [track],
           isLoading: false,
-          albumName: null,
-          playlistName: null,
           coverUrl: track.coverUrl,
         );
       } else if (type == 'album') {
         final albumInfo = metadata['album_info'] as Map<String, dynamic>;
         final trackList = metadata['track_list'] as List<dynamic>;
         final tracks = trackList.map((t) => _parseTrack(t as Map<String, dynamic>)).toList();
-        state = state.copyWith(
+        state = TrackState(
           tracks: tracks,
           isLoading: false,
+          albumId: parsed['id'] as String?,
           albumName: albumInfo['name'] as String?,
-          playlistName: null,
           coverUrl: albumInfo['images'] as String?,
         );
+        // Pre-warm cache for album tracks in background
+        _preWarmCacheForTracks(tracks);
       } else if (type == 'playlist') {
         final playlistInfo = metadata['playlist_info'] as Map<String, dynamic>;
         final trackList = metadata['track_list'] as List<dynamic>;
         final tracks = trackList.map((t) => _parseTrack(t as Map<String, dynamic>)).toList();
         final owner = playlistInfo['owner'] as Map<String, dynamic>?;
-        state = state.copyWith(
+        state = TrackState(
           tracks: tracks,
           isLoading: false,
-          albumName: null,
           playlistName: owner?['name'] as String?,
           coverUrl: owner?['images'] as String?,
         );
+        // Pre-warm cache for playlist tracks in background
+        _preWarmCacheForTracks(tracks);
+      } else if (type == 'artist') {
+        final artistInfo = metadata['artist_info'] as Map<String, dynamic>;
+        final albumsList = metadata['albums'] as List<dynamic>;
+        final albums = albumsList.map((a) => _parseArtistAlbum(a as Map<String, dynamic>)).toList();
+        state = TrackState(
+          tracks: [], // No tracks for artist view
+          isLoading: false,
+          artistId: artistInfo['id'] as String?,
+          artistName: artistInfo['name'] as String?,
+          coverUrl: artistInfo['images'] as String?,
+          artistAlbums: albums,
+        );
       }
     } catch (e) {
-      state = state.copyWith(isLoading: false, error: e.toString());
+      if (!_isRequestValid(requestId)) return; // Request cancelled
+      // Preserve hasSearchText on error so user stays on search screen
+      state = TrackState(isLoading: false, error: e.toString(), hasSearchText: state.hasSearchText);
     }
   }
 
-  Future<void> search(String query) async {
-    state = state.copyWith(isLoading: true, error: null);
+  Future<void> search(String query, {String? metadataSource}) async {
+    // Increment request ID to cancel any pending requests
+    final requestId = ++_currentRequestId;
+
+    // Preserve hasSearchText during search
+    state = TrackState(isLoading: true, hasSearchText: state.hasSearchText);
 
     try {
-      final results = await PlatformBridge.searchSpotify(query, limit: 20);
+      // Use Deezer or Spotify based on settings
+      final source = metadataSource ?? 'deezer';
+      
+      // Debug log to show which source is being used
+      // ignore: avoid_print
+      print('[Search] Using metadata source: $source for query: "$query"');
+      
+      Map<String, dynamic> results;
+      if (source == 'deezer') {
+        results = await PlatformBridge.searchDeezerAll(query, trackLimit: 20, artistLimit: 5);
+        // ignore: avoid_print
+        print('[Search] Deezer returned ${(results['tracks'] as List?)?.length ?? 0} tracks');
+      } else {
+        results = await PlatformBridge.searchSpotifyAll(query, trackLimit: 20, artistLimit: 5);
+        // ignore: avoid_print
+        print('[Search] Spotify returned ${(results['tracks'] as List?)?.length ?? 0} tracks');
+      }
+      
+      if (!_isRequestValid(requestId)) return; // Request cancelled
+      
       final trackList = results['tracks'] as List<dynamic>? ?? [];
-      final tracks = trackList.map((t) => _parseSearchTrack(t as Map<String, dynamic>)).toList();
-      state = state.copyWith(
+      final artistList = results['artists'] as List<dynamic>? ?? [];
+      
+      // Parse tracks with error handling per item
+      final tracks = <Track>[];
+      for (final t in trackList) {
+        try {
+          if (t is Map<String, dynamic>) {
+            tracks.add(_parseSearchTrack(t));
+          }
+        } catch (e) {
+          // ignore: avoid_print
+          print('[Search] Failed to parse track: $e');
+        }
+      }
+      
+      // Parse artists with error handling per item
+      final artists = <SearchArtist>[];
+      for (final a in artistList) {
+        try {
+          if (a is Map<String, dynamic>) {
+            artists.add(_parseSearchArtist(a));
+          }
+        } catch (e) {
+          // ignore: avoid_print
+          print('[Search] Failed to parse artist: $e');
+        }
+      }
+      
+      // ignore: avoid_print
+      print('[Search] Parsed ${tracks.length} tracks, ${artists.length} artists');
+      
+      state = TrackState(
         tracks: tracks,
+        searchArtists: artists,
         isLoading: false,
-        albumName: null,
-        playlistName: null,
+        hasSearchText: state.hasSearchText,
       );
     } catch (e) {
-      state = state.copyWith(isLoading: false, error: e.toString());
+      if (!_isRequestValid(requestId)) return; // Request cancelled
+      // Preserve hasSearchText on error so user stays on search screen
+      state = TrackState(isLoading: false, error: e.toString(), hasSearchText: state.hasSearchText);
     }
   }
 
@@ -152,6 +314,11 @@ class TrackNotifier extends Notifier<TrackState> {
     state = const TrackState();
   }
 
+  /// Set search text state for back button handling
+  void setSearchText(bool hasText) {
+    state = state.copyWith(hasSearchText: hasText);
+  }
+
   Track _parseTrack(Map<String, dynamic> data) {
     return Track(
       id: data['spotify_id'] as String? ?? '',
@@ -161,7 +328,7 @@ class TrackNotifier extends Notifier<TrackState> {
       albumArtist: data['album_artist'] as String?,
       coverUrl: data['images'] as String?,
       isrc: data['isrc'] as String?,
-      duration: data['duration_ms'] as int? ?? 0,
+      duration: ((data['duration_ms'] as int? ?? 0) / 1000).round(),
       trackNumber: data['track_number'] as int?,
       discNumber: data['disc_number'] as int?,
       releaseDate: data['release_date'] as String?,
@@ -169,20 +336,73 @@ class TrackNotifier extends Notifier<TrackState> {
   }
 
   Track _parseSearchTrack(Map<String, dynamic> data) {
+    // Handle duration_ms which might be int or double
+    int durationMs = 0;
+    final durationValue = data['duration_ms'];
+    if (durationValue is int) {
+      durationMs = durationValue;
+    } else if (durationValue is double) {
+      durationMs = durationValue.toInt();
+    }
+    
     return Track(
-      id: data['spotify_id'] as String? ?? '',
-      name: data['name'] as String? ?? '',
-      artistName: data['artists'] as String? ?? '',
-      albumName: data['album_name'] as String? ?? '',
-      albumArtist: data['album_artist'] as String?,
-      coverUrl: data['images'] as String?,
-      isrc: data['isrc'] as String?,
-      duration: data['duration_ms'] as int? ?? 0,
+      id: (data['spotify_id'] ?? data['id'] ?? '').toString(),
+      name: (data['name'] ?? '').toString(),
+      artistName: (data['artists'] ?? data['artist'] ?? '').toString(),
+      albumName: (data['album_name'] ?? data['album'] ?? '').toString(),
+      albumArtist: data['album_artist']?.toString(),
+      coverUrl: data['images']?.toString(),
+      isrc: data['isrc']?.toString(),
+      duration: (durationMs / 1000).round(),
       trackNumber: data['track_number'] as int?,
       discNumber: data['disc_number'] as int?,
-      releaseDate: data['release_date'] as String?,
+      releaseDate: data['release_date']?.toString(),
     );
   }
+
+  ArtistAlbum _parseArtistAlbum(Map<String, dynamic> data) {
+    return ArtistAlbum(
+      id: data['id'] as String? ?? '',
+      name: data['name'] as String? ?? '',
+      releaseDate: data['release_date'] as String? ?? '',
+      totalTracks: data['total_tracks'] as int? ?? 0,
+      coverUrl: data['images'] as String?,
+      albumType: data['album_type'] as String? ?? 'album',
+      artists: data['artists'] as String? ?? '',
+    );
+  }
+
+  SearchArtist _parseSearchArtist(Map<String, dynamic> data) {
+    return SearchArtist(
+      id: data['id'] as String? ?? '',
+      name: data['name'] as String? ?? '',
+      imageUrl: data['images'] as String?,
+      followers: data['followers'] as int? ?? 0,
+      popularity: data['popularity'] as int? ?? 0,
+    );
+  }
+
+  /// Pre-warm track ID cache for faster downloads
+  /// Runs in background, doesn't block UI
+  void _preWarmCacheForTracks(List<Track> tracks) {
+    // Only pre-warm if we have tracks with ISRC
+    final tracksWithIsrc = tracks.where((t) => t.isrc != null && t.isrc!.isNotEmpty).toList();
+    if (tracksWithIsrc.isEmpty) return;
+
+    // Build request list for Go backend
+    final cacheRequests = tracksWithIsrc.map((t) => {
+      'isrc': t.isrc!,
+      'track_name': t.name,
+      'artist_name': t.artistName,
+      'spotify_id': t.id, // Include Spotify ID for Amazon lookup
+      'service': 'tidal', // Default to tidal for pre-warming
+    }).toList();
+
+    // Fire and forget - runs in background
+    PlatformBridge.preWarmTrackCache(cacheRequests).catchError((_) {
+      // Silently ignore errors - this is just an optimization
+    });
+  }
 }
 
 final trackProvider = NotifierProvider<TrackNotifier, TrackState>(

lib/screens/album_screen.dart

@@ -0,0 +1,738 @@
+import 'dart:io';
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:cached_network_image/cached_network_image.dart';
+import 'package:spotiflac_android/models/track.dart';
+import 'package:spotiflac_android/models/download_item.dart';
+import 'package:spotiflac_android/providers/download_queue_provider.dart';
+import 'package:spotiflac_android/providers/settings_provider.dart';
+import 'package:spotiflac_android/services/platform_bridge.dart';
+
+/// Simple in-memory cache for album tracks
+class _AlbumCache {
+  static final Map<String, _CacheEntry> _cache = {};
+  static const Duration _ttl = Duration(minutes: 10);
+
+  static List<Track>? get(String albumId) {
+    final entry = _cache[albumId];
+    if (entry == null) return null;
+    if (DateTime.now().isAfter(entry.expiresAt)) {
+      _cache.remove(albumId);
+      return null;
+    }
+    return entry.tracks;
+  }
+
+  static void set(String albumId, List<Track> tracks) {
+    _cache[albumId] = _CacheEntry(tracks, DateTime.now().add(_ttl));
+  }
+}
+
+class _CacheEntry {
+  final List<Track> tracks;
+  final DateTime expiresAt;
+  _CacheEntry(this.tracks, this.expiresAt);
+}
+
+/// Album detail screen with Material Expressive 3 design
+class AlbumScreen extends ConsumerStatefulWidget {
+  final String albumId;
+  final String albumName;
+  final String? coverUrl;
+  final List<Track>? tracks; // Optional - will fetch if null
+
+  const AlbumScreen({
+    super.key,
+    required this.albumId,
+    required this.albumName,
+    this.coverUrl,
+    this.tracks,
+  });
+
+  @override
+  ConsumerState<AlbumScreen> createState() => _AlbumScreenState();
+}
+
+class _AlbumScreenState extends ConsumerState<AlbumScreen> {
+  List<Track>? _tracks;
+  bool _isLoading = false;
+  String? _error;
+
+  @override
+  void initState() {
+    super.initState();
+    // Priority: widget.tracks > cache > fetch
+    _tracks = widget.tracks ?? _AlbumCache.get(widget.albumId);
+    if (_tracks == null) {
+      _fetchTracks();
+    }
+  }
+
+  Future<void> _fetchTracks() async {
+    setState(() => _isLoading = true);
+    try {
+      Map<String, dynamic> metadata;
+      
+      // Check if this is a Deezer album ID (format: "deezer:123456")
+      if (widget.albumId.startsWith('deezer:')) {
+        final deezerAlbumId = widget.albumId.replaceFirst('deezer:', '');
+        // ignore: avoid_print
+        print('[AlbumScreen] Fetching from Deezer: $deezerAlbumId');
+        metadata = await PlatformBridge.getDeezerMetadata('album', deezerAlbumId);
+      } else {
+        // Spotify album - use fallback method
+        // ignore: avoid_print
+        print('[AlbumScreen] Fetching from Spotify with fallback: ${widget.albumId}');
+        final url = 'https://open.spotify.com/album/${widget.albumId}';
+        metadata = await PlatformBridge.getSpotifyMetadataWithFallback(url);
+      }
+      
+      final trackList = metadata['track_list'] as List<dynamic>;
+      final tracks = trackList.map((t) => _parseTrack(t as Map<String, dynamic>)).toList();
+      
+      // Store in cache
+      _AlbumCache.set(widget.albumId, tracks);
+      
+      if (mounted) {
+        setState(() {
+          _tracks = tracks;
+          _isLoading = false;
+        });
+      }
+    } catch (e) {
+      if (mounted) {
+        setState(() {
+          _error = e.toString();
+          _isLoading = false;
+        });
+      }
+    }
+  }
+
+  Track _parseTrack(Map<String, dynamic> data) {
+    return Track(
+      id: data['spotify_id'] as String? ?? '',
+      name: data['name'] as String? ?? '',
+      artistName: data['artists'] as String? ?? '',
+      albumName: data['album_name'] as String? ?? '',
+      albumArtist: data['album_artist'] as String?,
+      coverUrl: data['images'] as String?,
+      isrc: data['isrc'] as String?,
+      duration: ((data['duration_ms'] as int? ?? 0) / 1000).round(),
+      trackNumber: data['track_number'] as int?,
+      discNumber: data['disc_number'] as int?,
+      releaseDate: data['release_date'] as String?,
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final tracks = _tracks ?? [];
+
+    return Scaffold(
+      body: CustomScrollView(
+        slivers: [
+          _buildAppBar(context, colorScheme),
+          _buildInfoCard(context, colorScheme),
+          if (_isLoading)
+            const SliverToBoxAdapter(child: Padding(
+              padding: EdgeInsets.all(32),
+              child: Center(child: CircularProgressIndicator()),
+            )),
+            if (_error != null)
+            SliverToBoxAdapter(child: Padding(
+              padding: const EdgeInsets.all(16),
+              child: _buildErrorWidget(_error!, colorScheme),
+            )),
+          if (!_isLoading && _error == null && tracks.isNotEmpty) ...[
+            _buildTrackListHeader(context, colorScheme),
+            _buildTrackList(context, colorScheme, tracks),
+          ],
+          const SliverToBoxAdapter(child: SizedBox(height: 32)),
+        ],
+      ),
+    );
+  }
+
+  Widget _buildAppBar(BuildContext context, ColorScheme colorScheme) {
+    return SliverAppBar(
+      expandedHeight: 280,
+      pinned: true,
+      stretch: true,
+      backgroundColor: colorScheme.surface,
+      surfaceTintColor: Colors.transparent,
+      flexibleSpace: FlexibleSpaceBar(
+        background: Stack(
+          fit: StackFit.expand,
+          children: [
+            if (widget.coverUrl != null)
+              CachedNetworkImage(
+                imageUrl: widget.coverUrl!,
+                fit: BoxFit.cover,
+                color: Colors.black.withValues(alpha: 0.5),
+                colorBlendMode: BlendMode.darken,
+                memCacheWidth: 600,
+              ),
+            Container(
+              decoration: BoxDecoration(
+                gradient: LinearGradient(
+                  begin: Alignment.topCenter,
+                  end: Alignment.bottomCenter,
+                  colors: [
+                    Colors.transparent,
+                    colorScheme.surface.withValues(alpha: 0.8),
+                    colorScheme.surface,
+                  ],
+                  stops: const [0.0, 0.7, 1.0],
+                ),
+              ),
+            ),
+            Center(
+              child: Padding(
+                padding: const EdgeInsets.only(top: 60),
+                child: Container(
+                  width: 140,
+                  height: 140,
+                  decoration: BoxDecoration(
+                    borderRadius: BorderRadius.circular(16),
+                    boxShadow: [
+                      BoxShadow(
+                        color: Colors.black.withValues(alpha: 0.3),
+                        blurRadius: 20,
+                        offset: const Offset(0, 10),
+                      ),
+                    ],
+                  ),
+                  child: ClipRRect(
+                    borderRadius: BorderRadius.circular(16),
+                    child: widget.coverUrl != null
+                        ? CachedNetworkImage(imageUrl: widget.coverUrl!, fit: BoxFit.cover, memCacheWidth: 280)
+                        : Container(
+                            color: colorScheme.surfaceContainerHighest,
+                            child: Icon(Icons.album, size: 48, color: colorScheme.onSurfaceVariant),
+                          ),
+                  ),
+                ),
+              ),
+            ),
+          ],
+        ),
+        stretchModes: const [StretchMode.zoomBackground, StretchMode.blurBackground],
+      ),
+      leading: IconButton(
+        icon: Container(
+          padding: const EdgeInsets.all(8),
+          decoration: BoxDecoration(color: colorScheme.surface.withValues(alpha: 0.8), shape: BoxShape.circle),
+          child: Icon(Icons.arrow_back, color: colorScheme.onSurface),
+        ),
+        onPressed: () => Navigator.pop(context),
+      ),
+    );
+  }
+
+  Widget _buildInfoCard(BuildContext context, ColorScheme colorScheme) {
+    final tracks = _tracks ?? [];
+    return SliverToBoxAdapter(
+      child: Padding(
+        padding: const EdgeInsets.all(16),
+        child: Card(
+          elevation: 0,
+          color: colorScheme.surfaceContainerLow,
+          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
+          child: Padding(
+            padding: const EdgeInsets.all(20),
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                Text(
+                  widget.albumName,
+                  style: Theme.of(context).textTheme.headlineSmall?.copyWith(fontWeight: FontWeight.bold, color: colorScheme.onSurface),
+                ),
+                const SizedBox(height: 8),
+                if (tracks.isNotEmpty)
+                  Container(
+                    padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
+                    decoration: BoxDecoration(color: colorScheme.secondaryContainer, borderRadius: BorderRadius.circular(20)),
+                    child: Row(
+                      mainAxisSize: MainAxisSize.min,
+                      children: [
+                        Icon(Icons.music_note, size: 14, color: colorScheme.onSecondaryContainer),
+                        const SizedBox(width: 4),
+                        Text('${tracks.length} tracks', style: TextStyle(color: colorScheme.onSecondaryContainer, fontWeight: FontWeight.w600, fontSize: 12)),
+                      ],
+                    ),
+                  ),
+                if (tracks.isNotEmpty) ...[
+                  const SizedBox(height: 16),
+                  FilledButton.icon(
+                    onPressed: () => _downloadAll(context),
+                    icon: const Icon(Icons.download),
+                    label: Text('Download All (${tracks.length})'),
+                    style: FilledButton.styleFrom(minimumSize: const Size.fromHeight(52), shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16))),
+                  ),
+                ],
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+
+  Widget _buildTrackListHeader(BuildContext context, ColorScheme colorScheme) {
+    return SliverToBoxAdapter(
+      child: Padding(
+        padding: const EdgeInsets.fromLTRB(20, 8, 20, 8),
+        child: Row(
+          children: [
+            Icon(Icons.queue_music, size: 20, color: colorScheme.primary),
+            const SizedBox(width: 8),
+            Text('Tracks', style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.w600, color: colorScheme.onSurface)),
+          ],
+        ),
+      ),
+    );
+  }
+
+  Widget _buildTrackList(BuildContext context, ColorScheme colorScheme, List<Track> tracks) {
+    return SliverList(
+      delegate: SliverChildBuilderDelegate(
+        (context, index) {
+          final track = tracks[index];
+          return KeyedSubtree(
+            key: ValueKey(track.id),
+            child: _AlbumTrackItem(
+              track: track,
+              onDownload: () => _downloadTrack(context, track),
+            ),
+          );
+        },
+        childCount: tracks.length,
+      ),
+    );
+  }
+
+  void _downloadTrack(BuildContext context, Track track) {
+    final settings = ref.read(settingsProvider);
+    if (settings.askQualityBeforeDownload) {
+      _showQualityPicker(context, (quality, service) {
+        ref.read(downloadQueueProvider.notifier).addToQueue(track, service, qualityOverride: quality);
+        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added "${track.name}" to queue')));
+      }, trackName: track.name, artistName: track.artistName, coverUrl: track.coverUrl);
+    } else {
+      ref.read(downloadQueueProvider.notifier).addToQueue(track, settings.defaultService);
+      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added "${track.name}" to queue')));
+    }
+  }
+
+  void _downloadAll(BuildContext context) {
+    final tracks = _tracks;
+    if (tracks == null || tracks.isEmpty) return;
+    final settings = ref.read(settingsProvider);
+    if (settings.askQualityBeforeDownload) {
+      _showQualityPicker(context, (quality, service) {
+        ref.read(downloadQueueProvider.notifier).addMultipleToQueue(tracks, service, qualityOverride: quality);
+        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added ${tracks.length} tracks to queue')));
+      }, trackName: '${tracks.length} tracks', artistName: widget.albumName);
+    } else {
+      ref.read(downloadQueueProvider.notifier).addMultipleToQueue(tracks, settings.defaultService);
+      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added ${tracks.length} tracks to queue')));
+    }
+  }
+
+  void _showQualityPicker(BuildContext context, void Function(String quality, String service) onSelect, {String? trackName, String? artistName, String? coverUrl}) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final settings = ref.read(settingsProvider);
+    String selectedService = settings.defaultService;
+    
+    showModalBottomSheet(
+      context: context,
+      backgroundColor: colorScheme.surfaceContainerHigh,
+      shape: const RoundedRectangleBorder(borderRadius: BorderRadius.vertical(top: Radius.circular(28))),
+      isScrollControlled: true,
+      builder: (context) => StatefulBuilder(
+        builder: (context, setModalState) => SafeArea(
+          child: SingleChildScrollView(
+            child: Column(
+              mainAxisSize: MainAxisSize.min,
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                if (trackName != null) ...[
+                  _TrackInfoHeader(trackName: trackName, artistName: artistName, coverUrl: coverUrl),
+                  Divider(height: 1, color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
+                ] else ...[
+                  const SizedBox(height: 8),
+                  Center(child: Container(width: 40, height: 4, decoration: BoxDecoration(color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4), borderRadius: BorderRadius.circular(2)))),
+                ],
+                // Service selector
+                Padding(
+                  padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
+                  child: Text('Download From', style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold)),
+                ),
+                Padding(
+                  padding: const EdgeInsets.symmetric(horizontal: 20),
+                  child: Row(
+                    children: [
+                      _ServiceChip(label: 'Tidal', isSelected: selectedService == 'tidal', onTap: () => setModalState(() => selectedService = 'tidal')),
+                      const SizedBox(width: 8),
+                      _ServiceChip(label: 'Qobuz', isSelected: selectedService == 'qobuz', onTap: () => setModalState(() => selectedService = 'qobuz')),
+                      const SizedBox(width: 8),
+                      _ServiceChip(label: 'Amazon', isSelected: selectedService == 'amazon', onTap: () => setModalState(() => selectedService = 'amazon')),
+                    ],
+                  ),
+                ),
+                Padding(
+                  padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
+                  child: Text('Select Quality', style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold)),
+                ),
+                // Disclaimer
+                Padding(
+                  padding: const EdgeInsets.fromLTRB(24, 0, 24, 12),
+                  child: Text(
+                    'Actual quality depends on track availability. Hi-Res may not be available for all tracks.',
+                    style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                      color: colorScheme.onSurfaceVariant,
+                      fontStyle: FontStyle.italic,
+                    ),
+                  ),
+                ),
+                _QualityOption(title: 'FLAC Lossless', subtitle: '16-bit / 44.1kHz', icon: Icons.music_note, onTap: () { Navigator.pop(context); onSelect('LOSSLESS', selectedService); }),
+                _QualityOption(title: 'Hi-Res FLAC', subtitle: '24-bit / up to 96kHz', icon: Icons.high_quality, onTap: () { Navigator.pop(context); onSelect('HI_RES', selectedService); }),
+                _QualityOption(title: 'Hi-Res FLAC Max', subtitle: '24-bit / up to 192kHz', icon: Icons.four_k, onTap: () { Navigator.pop(context); onSelect('HI_RES_LOSSLESS', selectedService); }),
+                const SizedBox(height: 16),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+
+  /// Build error widget with special handling for rate limit (429)
+  Widget _buildErrorWidget(String error, ColorScheme colorScheme) {
+    final isRateLimit = error.contains('429') || 
+                        error.toLowerCase().contains('rate limit') ||
+                        error.toLowerCase().contains('too many requests');
+    
+    if (isRateLimit) {
+      return Card(
+        elevation: 0,
+        color: colorScheme.errorContainer,
+        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
+        child: Padding(
+          padding: const EdgeInsets.all(16),
+          child: Row(
+            children: [
+              Icon(Icons.timer_off, color: colorScheme.onErrorContainer),
+              const SizedBox(width: 12),
+              Expanded(
+                child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: [
+                    Text(
+                      'Rate Limited',
+                      style: TextStyle(
+                        color: colorScheme.onErrorContainer,
+                        fontWeight: FontWeight.bold,
+                      ),
+                    ),
+                    const SizedBox(height: 4),
+                    Text(
+                      'Too many requests. Please wait a moment and try again.',
+                      style: TextStyle(
+                        color: colorScheme.onErrorContainer,
+                        fontSize: 12,
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+            ],
+          ),
+        ),
+      );
+    }
+    
+    // Default error display
+    return Card(
+      elevation: 0,
+      color: colorScheme.errorContainer.withValues(alpha: 0.5),
+      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
+      child: Padding(
+        padding: const EdgeInsets.all(16),
+        child: Row(
+          children: [
+            Icon(Icons.error_outline, color: colorScheme.error),
+            const SizedBox(width: 12),
+            Expanded(child: Text(error, style: TextStyle(color: colorScheme.error))),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+class _QualityOption extends StatelessWidget {
+  final String title;
+  final String subtitle;
+  final IconData icon;
+  final VoidCallback onTap;
+
+  const _QualityOption({required this.title, required this.subtitle, required this.icon, required this.onTap});
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    return ListTile(
+      contentPadding: const EdgeInsets.symmetric(horizontal: 24, vertical: 4),
+      leading: Container(padding: const EdgeInsets.all(10), decoration: BoxDecoration(color: colorScheme.primaryContainer, borderRadius: BorderRadius.circular(12)), child: Icon(icon, color: colorScheme.onPrimaryContainer, size: 20)),
+      title: Text(title, style: const TextStyle(fontWeight: FontWeight.w500)),
+      subtitle: Text(subtitle, style: TextStyle(color: colorScheme.onSurfaceVariant)),
+      onTap: onTap,
+    );
+  }
+}
+
+class _ServiceChip extends StatelessWidget {
+  final String label;
+  final bool isSelected;
+  final VoidCallback onTap;
+  const _ServiceChip({required this.label, required this.isSelected, required this.onTap});
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    return Expanded(
+      child: GestureDetector(
+        onTap: onTap,
+        child: AnimatedContainer(
+          duration: const Duration(milliseconds: 200),
+          padding: const EdgeInsets.symmetric(vertical: 10),
+          decoration: BoxDecoration(
+            color: isSelected ? colorScheme.primaryContainer : colorScheme.surfaceContainerHighest,
+            borderRadius: BorderRadius.circular(12),
+            border: isSelected ? null : Border.all(color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
+          ),
+          child: Text(
+            label,
+            textAlign: TextAlign.center,
+            style: TextStyle(
+              fontWeight: isSelected ? FontWeight.w600 : FontWeight.normal,
+              color: isSelected ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant,
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+class _TrackInfoHeader extends StatefulWidget {
+  final String trackName;
+  final String? artistName;
+  final String? coverUrl;
+  const _TrackInfoHeader({required this.trackName, this.artistName, this.coverUrl});
+
+  @override
+  State<_TrackInfoHeader> createState() => _TrackInfoHeaderState();
+}
+
+class _TrackInfoHeaderState extends State<_TrackInfoHeader> {
+  bool _expanded = false;
+  bool _isOverflowing = false;
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    return Material(
+      color: Colors.transparent,
+      child: InkWell(
+        onTap: _isOverflowing ? () => setState(() => _expanded = !_expanded) : null,
+        borderRadius: const BorderRadius.only(topLeft: Radius.circular(28), topRight: Radius.circular(28)),
+        child: Column(
+          children: [
+            const SizedBox(height: 8),
+            Container(width: 40, height: 4, decoration: BoxDecoration(color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4), borderRadius: BorderRadius.circular(2))),
+            Padding(
+              padding: const EdgeInsets.fromLTRB(16, 12, 16, 12),
+              child: Row(
+                children: [
+                  ClipRRect(
+                    borderRadius: BorderRadius.circular(8),
+                    child: widget.coverUrl != null
+                        ? Image.network(widget.coverUrl!, width: 56, height: 56, fit: BoxFit.cover,
+                            errorBuilder: (_, e, s) => Container(width: 56, height: 56, color: colorScheme.surfaceContainerHighest, child: Icon(Icons.music_note, color: colorScheme.onSurfaceVariant)))
+                        : Container(width: 56, height: 56, color: colorScheme.surfaceContainerHighest, child: Icon(Icons.music_note, color: colorScheme.onSurfaceVariant)),
+                  ),
+                  const SizedBox(width: 12),
+                  Expanded(
+                    child: LayoutBuilder(
+                      builder: (context, constraints) {
+                        final titleStyle = Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.w600);
+                        final titleSpan = TextSpan(text: widget.trackName, style: titleStyle);
+                        final titlePainter = TextPainter(text: titleSpan, maxLines: 1, textDirection: TextDirection.ltr)..layout(maxWidth: constraints.maxWidth);
+                        final titleOverflows = titlePainter.didExceedMaxLines;
+                        
+                        WidgetsBinding.instance.addPostFrameCallback((_) {
+                          if (mounted && _isOverflowing != titleOverflows) {
+                            setState(() => _isOverflowing = titleOverflows);
+                          }
+                        });
+                        
+                        return Column(
+                          crossAxisAlignment: CrossAxisAlignment.start,
+                          children: [
+                            Text(
+                              widget.trackName,
+                              style: titleStyle,
+                              maxLines: _expanded ? 10 : 1,
+                              overflow: _expanded ? TextOverflow.visible : TextOverflow.ellipsis,
+                            ),
+                            if (widget.artistName != null) ...[
+                              const SizedBox(height: 2),
+                              Text(
+                                widget.artistName!,
+                                style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: colorScheme.onSurfaceVariant),
+                                maxLines: _expanded ? 3 : 1,
+                                overflow: _expanded ? TextOverflow.visible : TextOverflow.ellipsis,
+                              ),
+                            ],
+                          ],
+                        );
+                      },
+                    ),
+                  ),
+                  if (_isOverflowing || _expanded)
+                    Icon(_expanded ? Icons.expand_less : Icons.expand_more, color: colorScheme.onSurfaceVariant, size: 20),
+                ],
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+/// Separate Consumer widget for each track - only rebuilds when this specific track's status changes
+class _AlbumTrackItem extends ConsumerWidget {
+  final Track track;
+  final VoidCallback onDownload;
+
+  const _AlbumTrackItem({required this.track, required this.onDownload});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final colorScheme = Theme.of(context).colorScheme;
+    
+    // Only watch the specific item for this track
+    final queueItem = ref.watch(downloadQueueProvider.select((state) {
+      return state.items.where((item) => item.track.id == track.id).firstOrNull;
+    }));
+    
+    // Check if track is in history (already downloaded before)
+    final isInHistory = ref.watch(downloadHistoryProvider.select((state) {
+      return state.isDownloaded(track.id);
+    }));
+    
+    final isQueued = queueItem != null;
+    final isDownloading = queueItem?.status == DownloadStatus.downloading;
+    final isFinalizing = queueItem?.status == DownloadStatus.finalizing;
+    final isCompleted = queueItem?.status == DownloadStatus.completed;
+    final progress = queueItem?.progress ?? 0.0;
+    
+    // Show as downloaded if in queue completed OR in history
+    final showAsDownloaded = isCompleted || (!isQueued && isInHistory);
+
+    return Padding(
+      padding: const EdgeInsets.symmetric(horizontal: 8),
+      child: Card(
+        elevation: 0,
+        color: Colors.transparent,
+        margin: const EdgeInsets.symmetric(vertical: 2),
+        child: ListTile(
+          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
+          leading: track.coverUrl != null
+              ? ClipRRect(borderRadius: BorderRadius.circular(8), child: CachedNetworkImage(imageUrl: track.coverUrl!, width: 48, height: 48, fit: BoxFit.cover, memCacheWidth: 96))
+              : Container(width: 48, height: 48, decoration: BoxDecoration(color: colorScheme.surfaceContainerHighest, borderRadius: BorderRadius.circular(8)), child: Icon(Icons.music_note, color: colorScheme.onSurfaceVariant)),
+          title: Text(track.name, maxLines: 1, overflow: TextOverflow.ellipsis, style: Theme.of(context).textTheme.bodyLarge?.copyWith(fontWeight: FontWeight.w500)),
+          subtitle: Text(track.artistName, maxLines: 1, overflow: TextOverflow.ellipsis, style: TextStyle(color: colorScheme.onSurfaceVariant)),
+          trailing: _buildDownloadButton(context, ref, colorScheme, isQueued: isQueued, isDownloading: isDownloading, isFinalizing: isFinalizing, showAsDownloaded: showAsDownloaded, isInHistory: isInHistory, progress: progress),
+          onTap: () => _handleTap(context, ref, isQueued: isQueued, isInHistory: isInHistory),
+        ),
+      ),
+    );
+  }
+
+  void _handleTap(BuildContext context, WidgetRef ref, {required bool isQueued, required bool isInHistory}) async {
+    if (isQueued) return;
+    
+    if (isInHistory) {
+      final historyItem = ref.read(downloadHistoryProvider.notifier).getBySpotifyId(track.id);
+      if (historyItem != null) {
+        final fileExists = await File(historyItem.filePath).exists();
+        if (fileExists) {
+          if (context.mounted) {
+            ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('"${track.name}" already downloaded')));
+          }
+          return;
+        } else {
+          ref.read(downloadHistoryProvider.notifier).removeBySpotifyId(track.id);
+        }
+      }
+    }
+    
+    onDownload();
+  }
+
+  Widget _buildDownloadButton(BuildContext context, WidgetRef ref, ColorScheme colorScheme, {
+    required bool isQueued,
+    required bool isDownloading,
+    required bool isFinalizing,
+    required bool showAsDownloaded,
+    required bool isInHistory,
+    required double progress,
+  }) {
+    const double size = 44.0;
+    const double iconSize = 20.0;
+    
+    if (showAsDownloaded) {
+      return GestureDetector(
+        onTap: () => _handleTap(context, ref, isQueued: isQueued, isInHistory: isInHistory),
+        child: Container(width: size, height: size, decoration: BoxDecoration(color: colorScheme.primaryContainer, shape: BoxShape.circle), child: Icon(Icons.check, color: colorScheme.onPrimaryContainer, size: iconSize)),
+      );
+    } else if (isFinalizing) {
+      return SizedBox(
+        width: size,
+        height: size,
+        child: Stack(
+          alignment: Alignment.center,
+          children: [
+            CircularProgressIndicator(strokeWidth: 3, color: colorScheme.tertiary, backgroundColor: colorScheme.surfaceContainerHighest),
+            Icon(Icons.edit_note, color: colorScheme.tertiary, size: 16),
+          ],
+        ),
+      );
+    } else if (isDownloading) {
+      return SizedBox(
+        width: size,
+        height: size,
+        child: Stack(
+          alignment: Alignment.center,
+          children: [
+            CircularProgressIndicator(value: progress > 0 ? progress : null, strokeWidth: 3, color: colorScheme.primary, backgroundColor: colorScheme.surfaceContainerHighest),
+            if (progress > 0) Text('${(progress * 100).toInt()}', style: TextStyle(fontSize: 10, fontWeight: FontWeight.bold, color: colorScheme.primary)),
+          ],
+        ),
+      );
+    } else if (isQueued) {
+      return Container(width: size, height: size, decoration: BoxDecoration(color: colorScheme.surfaceContainerHighest, shape: BoxShape.circle), child: Icon(Icons.hourglass_empty, color: colorScheme.onSurfaceVariant, size: iconSize));
+    } else {
+      return GestureDetector(
+        onTap: onDownload,
+        child: Container(width: size, height: size, decoration: BoxDecoration(color: colorScheme.secondaryContainer, shape: BoxShape.circle), child: Icon(Icons.download, color: colorScheme.onSecondaryContainer, size: iconSize)),
+      );
+    }
+  }
+}

lib/screens/artist_screen.dart

@@ -0,0 +1,421 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:cached_network_image/cached_network_image.dart';
+import 'package:spotiflac_android/providers/track_provider.dart';
+import 'package:spotiflac_android/providers/settings_provider.dart';
+import 'package:spotiflac_android/services/platform_bridge.dart';
+import 'package:spotiflac_android/screens/album_screen.dart';
+
+/// Simple in-memory cache for artist discography
+class _ArtistCache {
+  static final Map<String, _CacheEntry> _cache = {};
+  static const Duration _ttl = Duration(minutes: 10);
+
+  static List<ArtistAlbum>? get(String artistId) {
+    final entry = _cache[artistId];
+    if (entry == null) return null;
+    if (DateTime.now().isAfter(entry.expiresAt)) {
+      _cache.remove(artistId);
+      return null;
+    }
+    return entry.albums;
+  }
+
+  static void set(String artistId, List<ArtistAlbum> albums) {
+    _cache[artistId] = _CacheEntry(albums, DateTime.now().add(_ttl));
+  }
+}
+
+class _CacheEntry {
+  final List<ArtistAlbum> albums;
+  final DateTime expiresAt;
+  _CacheEntry(this.albums, this.expiresAt);
+}
+
+/// Artist screen with Material Expressive 3 design - shows discography
+class ArtistScreen extends ConsumerStatefulWidget {
+  final String artistId;
+  final String artistName;
+  final String? coverUrl;
+  final List<ArtistAlbum>? albums; // Optional - will fetch if null
+
+  const ArtistScreen({
+    super.key,
+    required this.artistId,
+    required this.artistName,
+    this.coverUrl,
+    this.albums,
+  });
+
+  @override
+  ConsumerState<ArtistScreen> createState() => _ArtistScreenState();
+}
+
+class _ArtistScreenState extends ConsumerState<ArtistScreen> {
+  bool _isLoadingDiscography = false;
+  List<ArtistAlbum>? _albums;
+  String? _error;
+
+  @override
+  void initState() {
+    super.initState();
+    // Priority: widget.albums > cache > fetch
+    _albums = widget.albums ?? _ArtistCache.get(widget.artistId);
+    if (_albums == null) {
+      _fetchDiscography();
+    }
+  }
+
+  Future<void> _fetchDiscography() async {
+    setState(() => _isLoadingDiscography = true);
+    try {
+      List<ArtistAlbum> albums;
+      
+      // Check if this is a Deezer artist ID (format: "deezer:123456")
+      if (widget.artistId.startsWith('deezer:')) {
+        final deezerArtistId = widget.artistId.replaceFirst('deezer:', '');
+        // ignore: avoid_print
+        print('[ArtistScreen] Fetching from Deezer: $deezerArtistId');
+        final metadata = await PlatformBridge.getDeezerMetadata('artist', deezerArtistId);
+        final albumsList = metadata['albums'] as List<dynamic>;
+        albums = albumsList.map((a) => _parseArtistAlbum(a as Map<String, dynamic>)).toList();
+      } else {
+        // Spotify artist - use fallback method
+        // ignore: avoid_print
+        print('[ArtistScreen] Fetching from Spotify with fallback: ${widget.artistId}');
+        final url = 'https://open.spotify.com/artist/${widget.artistId}';
+        final metadata = await PlatformBridge.getSpotifyMetadataWithFallback(url);
+        final albumsList = metadata['albums'] as List<dynamic>;
+        albums = albumsList.map((a) => _parseArtistAlbum(a as Map<String, dynamic>)).toList();
+      }
+      
+      // Store in cache
+      _ArtistCache.set(widget.artistId, albums);
+      
+      if (mounted) {
+        setState(() {
+          _albums = albums;
+          _isLoadingDiscography = false;
+        });
+      }
+    } catch (e) {
+      if (mounted) {
+        setState(() {
+          _error = e.toString();
+          _isLoadingDiscography = false;
+        });
+      }
+    }
+  }
+
+  ArtistAlbum _parseArtistAlbum(Map<String, dynamic> data) {
+    return ArtistAlbum(
+      id: data['id'] as String? ?? '',
+      name: data['name'] as String? ?? '',
+      releaseDate: data['release_date'] as String? ?? '',
+      totalTracks: data['total_tracks'] as int? ?? 0,
+      coverUrl: data['images'] as String?,
+      albumType: data['album_type'] as String? ?? 'album',
+      artists: data['artists'] as String? ?? '',
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final albums = _albums ?? [];
+    final albumsOnly = albums.where((a) => a.albumType == 'album').toList();
+    final singles = albums.where((a) => a.albumType == 'single').toList();
+    final compilations = albums.where((a) => a.albumType == 'compilation').toList();
+
+    return Scaffold(
+      body: Stack(
+        children: [
+          CustomScrollView(
+            slivers: [
+              _buildAppBar(context, colorScheme),
+              _buildInfoCard(context, colorScheme),
+              if (_isLoadingDiscography)
+                const SliverToBoxAdapter(child: Padding(
+                  padding: EdgeInsets.all(32),
+                  child: Center(child: CircularProgressIndicator()),
+                )),
+              if (_error != null)
+                SliverToBoxAdapter(child: Padding(
+                  padding: const EdgeInsets.all(16),
+                  child: _buildErrorWidget(_error!, colorScheme),
+                )),
+              if (!_isLoadingDiscography && _error == null) ...[
+                if (albumsOnly.isNotEmpty) SliverToBoxAdapter(child: _buildAlbumSection('Albums', albumsOnly, colorScheme)),
+                if (singles.isNotEmpty) SliverToBoxAdapter(child: _buildAlbumSection('Singles & EPs', singles, colorScheme)),
+                if (compilations.isNotEmpty) SliverToBoxAdapter(child: _buildAlbumSection('Compilations', compilations, colorScheme)),
+              ],
+              const SliverToBoxAdapter(child: SizedBox(height: 32)),
+            ],
+          ),
+        ],
+      ),
+    );
+  }
+
+  Widget _buildAppBar(BuildContext context, ColorScheme colorScheme) {
+    // Validate image URL - must be non-null, non-empty, and have a valid host
+    final hasValidImage = widget.coverUrl != null && 
+                          widget.coverUrl!.isNotEmpty &&
+                          Uri.tryParse(widget.coverUrl!)?.hasAuthority == true;
+    
+    return SliverAppBar(
+      expandedHeight: 280,
+      pinned: true,
+      stretch: true,
+      backgroundColor: colorScheme.surface,
+      surfaceTintColor: Colors.transparent,
+      flexibleSpace: FlexibleSpaceBar(
+        background: Stack(
+          fit: StackFit.expand,
+          children: [
+            if (hasValidImage)
+              CachedNetworkImage(
+                imageUrl: widget.coverUrl!, 
+                fit: BoxFit.cover, 
+                color: Colors.black.withValues(alpha: 0.5), 
+                colorBlendMode: BlendMode.darken, 
+                memCacheWidth: 600,
+                errorWidget: (context, url, error) => Container(color: colorScheme.surfaceContainerHighest),
+              ),
+            Container(
+              decoration: BoxDecoration(
+                gradient: LinearGradient(
+                  begin: Alignment.topCenter,
+                  end: Alignment.bottomCenter,
+                  colors: [Colors.transparent, colorScheme.surface.withValues(alpha: 0.8), colorScheme.surface],
+                  stops: const [0.0, 0.7, 1.0],
+                ),
+              ),
+            ),
+            Center(
+              child: Padding(
+                padding: const EdgeInsets.only(top: 60),
+                child: Container(
+                  width: 140,
+                  height: 140,
+                  decoration: BoxDecoration(
+                    shape: BoxShape.circle,
+                    boxShadow: [BoxShadow(color: Colors.black.withValues(alpha: 0.3), blurRadius: 20, offset: const Offset(0, 10))],
+                  ),
+                  child: ClipOval(
+                    child: hasValidImage
+                        ? CachedNetworkImage(
+                            imageUrl: widget.coverUrl!, 
+                            fit: BoxFit.cover, 
+                            memCacheWidth: 280,
+                            errorWidget: (context, url, error) => Container(
+                              color: colorScheme.surfaceContainerHighest, 
+                              child: Icon(Icons.person, size: 48, color: colorScheme.onSurfaceVariant),
+                            ),
+                          )
+                        : Container(color: colorScheme.surfaceContainerHighest, child: Icon(Icons.person, size: 48, color: colorScheme.onSurfaceVariant)),
+                  ),
+                ),
+              ),
+            ),
+          ],
+        ),
+        stretchModes: const [StretchMode.zoomBackground, StretchMode.blurBackground],
+      ),
+      leading: IconButton(
+        icon: Container(padding: const EdgeInsets.all(8), decoration: BoxDecoration(color: colorScheme.surface.withValues(alpha: 0.8), shape: BoxShape.circle), child: Icon(Icons.arrow_back, color: colorScheme.onSurface)),
+        onPressed: () => Navigator.pop(context),
+      ),
+    );
+  }
+
+  Widget _buildInfoCard(BuildContext context, ColorScheme colorScheme) {
+    return SliverToBoxAdapter(
+      child: Padding(
+        padding: const EdgeInsets.all(16),
+        child: Card(
+          elevation: 0,
+          color: colorScheme.surfaceContainerLow,
+          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
+          child: Padding(
+            padding: const EdgeInsets.all(20),
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                Text(widget.artistName, style: Theme.of(context).textTheme.headlineSmall?.copyWith(fontWeight: FontWeight.bold, color: colorScheme.onSurface)),
+                const SizedBox(height: 8),
+                if (_albums != null)
+                  Container(
+                    padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
+                    decoration: BoxDecoration(color: colorScheme.primaryContainer, borderRadius: BorderRadius.circular(20)),
+                    child: Row(
+                      mainAxisSize: MainAxisSize.min,
+                      children: [
+                        Icon(Icons.album, size: 14, color: colorScheme.onPrimaryContainer),
+                        const SizedBox(width: 4),
+                        Text('${_albums!.length} releases', style: TextStyle(color: colorScheme.onPrimaryContainer, fontWeight: FontWeight.w600, fontSize: 12)),
+                      ],
+                    ),
+                  ),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+
+  Widget _buildAlbumSection(String title, List<ArtistAlbum> albums, ColorScheme colorScheme) {
+    return Column(
+      crossAxisAlignment: CrossAxisAlignment.start,
+      children: [
+        Padding(
+          padding: const EdgeInsets.fromLTRB(20, 16, 20, 8),
+          child: Row(
+            children: [
+              Icon(Icons.album, size: 20, color: colorScheme.primary),
+              const SizedBox(width: 8),
+              Text('$title (${albums.length})', style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.w600, color: colorScheme.primary)),
+            ],
+          ),
+        ),
+        SizedBox(
+          height: 210,
+          child: ListView.builder(
+            scrollDirection: Axis.horizontal,
+            padding: const EdgeInsets.symmetric(horizontal: 12),
+            itemCount: albums.length,
+            itemBuilder: (context, index) {
+              final album = albums[index];
+              return KeyedSubtree(key: ValueKey(album.id), child: _buildAlbumCard(album, colorScheme));
+            },
+          ),
+        ),
+      ],
+    );
+  }
+
+  Widget _buildAlbumCard(ArtistAlbum album, ColorScheme colorScheme) {
+    return GestureDetector(
+      onTap: () => _navigateToAlbum(album),
+      child: Container(
+        width: 140,
+        margin: const EdgeInsets.symmetric(horizontal: 6),
+        child: Card(
+          elevation: 0,
+          color: colorScheme.surfaceContainerLow,
+          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
+          child: Padding(
+            padding: const EdgeInsets.all(8),
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                ClipRRect(
+                  borderRadius: BorderRadius.circular(12),
+                  child: album.coverUrl != null
+                      ? CachedNetworkImage(imageUrl: album.coverUrl!, width: 124, height: 124, fit: BoxFit.cover, memCacheWidth: 248)
+                      : Container(width: 124, height: 124, color: colorScheme.surfaceContainerHighest, child: Icon(Icons.album, color: colorScheme.onSurfaceVariant, size: 40)),
+                ),
+                const SizedBox(height: 6),
+                Expanded(
+                  child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Text(album.name, style: Theme.of(context).textTheme.bodySmall?.copyWith(fontWeight: FontWeight.w600), maxLines: 2, overflow: TextOverflow.ellipsis),
+                      const Spacer(),
+                      Text(
+                        album.totalTracks > 0 
+                            ? '${album.releaseDate.length >= 4 ? album.releaseDate.substring(0, 4) : album.releaseDate} • ${album.totalTracks} tracks'
+                            : album.releaseDate.length >= 4 ? album.releaseDate.substring(0, 4) : album.releaseDate,
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(color: colorScheme.onSurfaceVariant, fontSize: 11),
+                        maxLines: 1,
+                        overflow: TextOverflow.ellipsis,
+                      ),
+                    ],
+                  ),
+                ),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+
+  void _navigateToAlbum(ArtistAlbum album) {
+    // Navigate immediately with data from artist discography, fetch tracks in AlbumScreen
+    ref.read(settingsProvider.notifier).setHasSearchedBefore();
+    Navigator.push(context, MaterialPageRoute(
+      builder: (context) => AlbumScreen(
+        albumId: album.id,
+        albumName: album.name,
+        coverUrl: album.coverUrl,
+        // tracks: null - will be fetched in AlbumScreen
+      ),
+    ));
+  }
+
+  /// Build error widget with special handling for rate limit (429)
+  Widget _buildErrorWidget(String error, ColorScheme colorScheme) {
+    final isRateLimit = error.contains('429') || 
+                        error.toLowerCase().contains('rate limit') ||
+                        error.toLowerCase().contains('too many requests');
+    
+    if (isRateLimit) {
+      return Card(
+        elevation: 0,
+        color: colorScheme.errorContainer,
+        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
+        child: Padding(
+          padding: const EdgeInsets.all(16),
+          child: Row(
+            children: [
+              Icon(Icons.timer_off, color: colorScheme.onErrorContainer),
+              const SizedBox(width: 12),
+              Expanded(
+                child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: [
+                    Text(
+                      'Rate Limited',
+                      style: TextStyle(
+                        color: colorScheme.onErrorContainer,
+                        fontWeight: FontWeight.bold,
+                      ),
+                    ),
+                    const SizedBox(height: 4),
+                    Text(
+                      'Too many requests. Please wait a moment and try again.',
+                      style: TextStyle(
+                        color: colorScheme.onErrorContainer,
+                        fontSize: 12,
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+            ],
+          ),
+        ),
+      );
+    }
+    
+    // Default error display
+    return Card(
+      elevation: 0,
+      color: colorScheme.errorContainer.withValues(alpha: 0.5),
+      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
+      child: Padding(
+        padding: const EdgeInsets.all(16),
+        child: Row(
+          children: [
+            Icon(Icons.error_outline, color: colorScheme.error),
+            const SizedBox(width: 12),
+            Expanded(child: Text(error, style: TextStyle(color: colorScheme.error))),
+          ],
+        ),
+      ),
+    );
+  }
+}