chore: update to v2.1.7 with new icons

feat: add download badges to release page
fix: use absolute path for IPA creation
2026-07-03 11:18:04 +02:00 · 2026-01-09 17:54:50 +07:00 · 2026-01-09 17:25:01 +07:00 · 2026-01-09 02:41:19 +07:00 · 2026-01-09 02:31:01 +07:00 · 2026-01-09 02:19:37 +07:00
101 changed files with 7524 additions and 1265 deletions
@@ -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)
@@ -28,7 +28,7 @@ jobs:
            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
@@ -43,21 +43,35 @@ jobs:
  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
@@ -71,7 +85,19 @@ 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 (required for gomobile)
+          $ANDROID_HOME/cmdline-tools/latest/bin/sdkmanager "ndk;25.2.9519653" "platforms;android-34" "build-tools;34.0.0"
+
+          # Set NDK path
+          echo "ANDROID_NDK_HOME=$ANDROID_HOME/ndk/25.2.9519653" >> $GITHUB_ENV

      - name: Install gomobile
        run: |
@@ -89,7 +115,7 @@ jobs:
      - name: Setup Flutter
        uses: subosito/flutter-action@v2
        with:
-          channel: 'stable'
+          channel: "stable"
          cache: true

      - name: Get Flutter dependencies
@@ -99,7 +125,14 @@ jobs:
        run: dart run flutter_launcher_icons

      - name: Build APK (Release - unsigned)
-        run: flutter build apk --release --split-per-abi
+        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
@@ -131,8 +164,8 @@ 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
@@ -140,7 +173,7 @@ 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
@@ -168,53 +201,70 @@ 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

@@ -222,18 +272,44 @@ 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:
@@ -245,7 +321,7 @@ jobs:
    needs: [get-version, build-android, build-ios]
    permissions:
      contents: write
-    
+
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
@@ -255,13 +331,13 @@ 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 $VERSION_NUM"
@@ -269,7 +345,7 @@ jobs:
          else
            echo "Found changelog content"
          fi
-          
+
          # Save to file for multiline support
          echo "$CHANGELOG" > /tmp/changelog.txt
          echo "Extracted changelog:"
@@ -291,32 +367,37 @@ 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
+          ![Android arm64 Downloads](https://img.shields.io/github/downloads/${REPO_OWNER}/${REPO_NAME}/${VERSION}/SpotiFLAC-${VERSION}-arm64.apk?style=for-the-badge&logo=android&label=arm64&color=3DDC84)
+          ![Android arm32 Downloads](https://img.shields.io/github/downloads/${REPO_OWNER}/${REPO_NAME}/${VERSION}/SpotiFLAC-${VERSION}-arm32.apk?style=for-the-badge&logo=android&label=arm32&color=3DDC84)
+
+          - **arm64**: \`SpotiFLAC-${VERSION}-arm64.apk\` (recommended for modern devices)
+          - **arm32**: \`SpotiFLAC-${VERSION}-arm32.apk\` (older devices)
+
+          #### iOS
+          ![iOS Downloads](https://img.shields.io/github/downloads/${REPO_OWNER}/${REPO_NAME}/${VERSION}/SpotiFLAC-${VERSION}-ios-unsigned.ipa?style=for-the-badge&logo=apple&label=iOS&color=0078D6)
+
          - **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
          FOOTER
-          
+
          echo "Release body:"
          cat /tmp/release_body.txt

@@ -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/

@@ -38,7 +35,7 @@ go_backend/*.xcframework/

 # Android
 android/.gradle/
-android/app/libs/
+android/app/libs/gobackend.aar
 android/local.properties
 android/*.iml
 android/key.properties
@@ -52,3 +49,4 @@ ios/Pods/
 ios/.symlinks/
 ios/Flutter/Flutter.framework/
 ios/Flutter/Flutter.podspec
+android/app/libs/gobackend-sources.jar
@@ -1,8 +1,310 @@
 # Changelog

+## [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
@@ -10,9 +312,11 @@
 - **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
@@ -22,6 +326,7 @@
 ## [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")
@@ -30,13 +335,16 @@
 - **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
@@ -46,18 +354,21 @@
 ## [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)
@@ -67,6 +378,7 @@
 ## [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
@@ -87,11 +399,12 @@
  - 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**: 
+- **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)
@@ -114,6 +427,7 @@
 - **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
@@ -124,6 +438,7 @@
 ## [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
@@ -133,6 +448,7 @@
 - **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
@@ -142,17 +458,21 @@
 ## [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
@@ -164,12 +484,14 @@
 ## [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
@@ -178,11 +500,13 @@
 - **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
@@ -197,12 +521,14 @@
 - **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
@@ -211,6 +537,7 @@
 - **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
@@ -220,6 +547,7 @@
 ## [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
@@ -246,6 +574,7 @@
 - **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
@@ -256,11 +585,13 @@
  - 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
@@ -269,26 +600,31 @@
 ## [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)
@@ -296,11 +632,13 @@ We apologize for the inconvenience. Previous releases were signed with different
 - **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
@@ -324,6 +662,7 @@ We apologize for the inconvenience. Previous releases were signed with different
  - 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
@@ -348,6 +687,7 @@ We apologize for the inconvenience. Previous releases were signed with different
  - "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
@@ -356,6 +696,7 @@ We apologize for the inconvenience. Previous releases were signed with different
 - 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
@@ -364,6 +705,7 @@ We apologize for the inconvenience. Previous releases were signed with different
 ## [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
@@ -376,12 +718,14 @@ We apologize for the inconvenience. Previous releases were signed with different
 - **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)
@@ -390,30 +734,34 @@ We apologize for the inconvenience. Previous releases were signed with different
 ## [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
@@ -424,15 +772,18 @@ We apologize for the inconvenience. Previous releases were signed with different
 - **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
@@ -441,6 +792,7 @@ We apologize for the inconvenience. Previous releases were signed with different
 - 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
@@ -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/ca16289599f71b8e50d3726a8c64a202ea922a1893bcf21b9eca1a050736f1f5/)

 <div align="center">

@@ -11,24 +12,41 @@ Get Spotify tracks in true FLAC from Tidal, Qobuz & Amazon Music — no account

 </div>

-> **Active Development Notice**: This app is under heavy development. New builds may be pushed multiple times daily. If frequent update notifications are annoying, tap "Don't remind" when the update dialog appears, or disable update checks in Settings.
-
 ### [Download](https://github.com/zarzet/SpotiFLAC-Mobile/releases)

 ## Screenshots

 <p align="center">
-  <img src="assets/images/1.jpg" width="200" />
-  <img src="assets/images/2.jpg" width="200" />
-  <img src="assets/images/3.jpg" width="200" />
-  <img src="assets/images/4.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!
@@ -1,3 +1,6 @@
+import java.util.Properties
+import java.io.FileInputStream
+
 plugins {
    id("com.android.application")
    id("kotlin-android")
@@ -7,9 +10,9 @@ plugins {

 // Load keystore properties for local builds
 val keystorePropertiesFile = rootProject.file("key.properties")
-val keystoreProperties = java.util.Properties()
+val keystoreProperties = Properties()
 if (keystorePropertiesFile.exists()) {
-    keystoreProperties.load(java.io.FileInputStream(keystorePropertiesFile))
+    keystoreProperties.load(FileInputStream(keystorePropertiesFile))
 }

 android {
@@ -32,10 +35,10 @@ android {
    signingConfigs {
        if (keystorePropertiesFile.exists()) {
            create("release") {
-                keyAlias = keystoreProperties["keyAlias"] as String
-                keyPassword = keystoreProperties["keyPassword"] as String
-                storeFile = file(keystoreProperties["storeFile"] as String)
-                storePassword = keystoreProperties["storePassword"] as String
+                keyAlias = keystoreProperties.getProperty("keyAlias")
+                keyPassword = keystoreProperties.getProperty("keyPassword")
+                storeFile = file(keystoreProperties.getProperty("storeFile"))
+                storePassword = keystoreProperties.getProperty("storePassword")
            }
        }
    }
@@ -94,7 +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")
 }
@@ -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>;
@@ -4,9 +4,11 @@
    <!-- 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" />
@@ -5,6 +5,8 @@ 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
@@ -13,6 +15,7 @@ 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) {
@@ -208,6 +211,72 @@ class MainActivity: FlutterActivity() {
                            }
                            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)
+                        }
                        else -> result.notImplemented()
                    }
                } catch (e: Exception) {
@@ -215,5 +284,37 @@ 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)
+                }
+            }
+        }
    }
 }
@@ -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});
+}
@@ -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 {
+		fmt.Printf("[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 {
+			fmt.Printf("[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
+			fmt.Printf("[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
@@ -72,10 +186,13 @@ func (a *AmazonDownloader) downloadFromDoubleDoubleService(amazonURL, outputDir
 		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 +202,43 @@ 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
+					fmt.Printf("[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
 		}

@@ -226,39 +371,69 @@ 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 && 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 item 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 {
 		// Fallback: direct copy without progress tracking
-		bytesWritten, err = io.Copy(out, resp.Body)
-	}
-	if err != nil {
-		return fmt.Errorf("failed to write file: %w", err)
+		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
+	FilePath    string
+	BitDepth    int
+	SampleRate  int
+	Title       string
+	Artist      string
+	Album       string
+	ReleaseDate string
+	TrackNumber int
+	DiscNumber  int
 }

 // downloadFromAmazon downloads a track using the request parameters
@@ -273,7 +448,22 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {

 	// 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:")
+		fmt.Printf("[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 AmazonDownloadResult{}, fmt.Errorf("failed to check Amazon availability via SongLink: %w", err)
 	}
@@ -295,6 +485,15 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 		return AmazonDownloadResult{}, fmt.Errorf("failed to get download URL: %w", err)
 	}

+	// Verify artist matches
+	if artistName != "" && !amazonArtistsMatch(req.ArtistName, artistName) {
+		fmt.Printf("[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
+	fmt.Printf("[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,
@@ -312,11 +511,29 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 		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 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 != "" {
@@ -342,41 +559,27 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 		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
+		fmt.Printf("[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 != "" {
+		fmt.Printf("[Amazon] Embedding parallel-fetched lyrics (%d lines)...\n", len(parallelResult.LyricsData.Lines))
+		if embedErr := EmbedLyrics(outputPath, parallelResult.LyricsLRC); embedErr != nil {
+			fmt.Printf("[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")
@@ -386,6 +589,8 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 	quality, err := GetAudioQuality(outputPath)
 	if err != nil {
 		fmt.Printf("[Amazon] Warning: couldn't read quality from file: %v\n", err)
+		// Add to ISRC index for fast duplicate checking
+		AddToISRCIndex(req.OutputDir, req.ISRC, outputPath)
 		// Return 0 to indicate unknown quality
 		return AmazonDownloadResult{
 			FilePath:   outputPath,
@@ -395,9 +600,19 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 	}
 	
 	fmt.Printf("[Amazon] Actual quality: %d-bit/%dHz\n", quality.BitDepth, quality.SampleRate)
+
+	// Add to ISRC index for fast duplicate checking
+	AddToISRCIndex(req.OutputDir, req.ISRC, outputPath)
+
 	return AmazonDownloadResult{
-		FilePath:   outputPath,
-		BitDepth:   quality.BitDepth,
-		SampleRate: quality.SampleRate,
+		FilePath:    outputPath,
+		BitDepth:    quality.BitDepth,
+		SampleRate:  quality.SampleRate,
+		Title:       req.TrackName,
+		Artist:      req.ArtistName,
+		Album:       req.AlbumName,
+		ReleaseDate: req.ReleaseDate,
+		TrackNumber: req.TrackNumber,
+		DiscNumber:  req.DiscNumber,
 	}, nil
 }
@@ -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)
+	}
+}
@@ -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)
+	}
+}
@@ -5,6 +5,7 @@ package gobackend
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 	"strings"
 	"time"
 )
@@ -132,7 +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
@@ -141,18 +143,32 @@ 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"`
 }

+// 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
+	FilePath    string
+	BitDepth    int
+	SampleRate  int
+	Title       string
+	Artist      string
+	Album       string
+	ReleaseDate string
+	TrackNumber int
+	DiscNumber  int
 }

 // DownloadTrack downloads a track from the specified service
@@ -179,9 +195,15 @@ func DownloadTrack(requestJSON string) (string, error) {
 		tidalResult, tidalErr := downloadFromTidal(req)
 		if tidalErr == nil {
 			result = DownloadResult{
-				FilePath:   tidalResult.FilePath,
-				BitDepth:   tidalResult.BitDepth,
-				SampleRate: tidalResult.SampleRate,
+				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,
 			}
 		}
 		err = tidalErr
@@ -189,9 +211,15 @@ func DownloadTrack(requestJSON string) (string, error) {
 		qobuzResult, qobuzErr := downloadFromQobuz(req)
 		if qobuzErr == nil {
 			result = DownloadResult{
-				FilePath:   qobuzResult.FilePath,
-				BitDepth:   qobuzResult.BitDepth,
-				SampleRate: qobuzResult.SampleRate,
+				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,
 			}
 		}
 		err = qobuzErr
@@ -199,9 +227,15 @@ func DownloadTrack(requestJSON string) (string, error) {
 		amazonResult, amazonErr := downloadFromAmazon(req)
 		if amazonErr == nil {
 			result = DownloadResult{
-				FilePath:   amazonResult.FilePath,
-				BitDepth:   amazonResult.BitDepth,
-				SampleRate: amazonResult.SampleRate,
+				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,
 			}
 		}
 		err = amazonErr
@@ -215,17 +249,36 @@ func DownloadTrack(requestJSON string) (string, error) {
 	
 	// Check if file already 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:      result.FilePath[7:],
-			AlreadyExists: true,
-			Service:       req.Service,
+			Success:          true,
+			Message:          "File already exists",
+			FilePath:         actualPath,
+			AlreadyExists:    true,
+			ActualBitDepth:   result.BitDepth,
+			ActualSampleRate: result.SampleRate,
+			Service:          req.Service,
 		}
 		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
+		fmt.Printf("[Download] Actual quality from file: %d-bit/%dHz\n", quality.BitDepth, quality.SampleRate)
+	} else {
+		fmt.Printf("[Download] Could not read quality from file: %v\n", qErr)
+	}
+	
 	resp := DownloadResponse{
 		Success:          true,
 		Message:          "Download complete",
@@ -233,6 +286,12 @@ func DownloadTrack(requestJSON string) (string, error) {
 		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,
 	}
 	
 	jsonBytes, _ := json.Marshal(resp)
@@ -255,12 +314,14 @@ func DownloadWithFallback(requestJSON string) (string, error) {
 	req.OutputDir = strings.TrimSpace(req.OutputDir)
 	
 	// Build service order starting with preferred service
-	allServices := []string{"tidal", "qobuz", "amazon"}
+	allServices := []string{"qobuz", "tidal", "amazon"}
 	preferredService := req.Service
 	if preferredService == "" {
 		preferredService = "tidal"
 	}
 	
+	fmt.Printf("[DownloadWithFallback] Preferred service from request: '%s'\n", req.Service)
+	
 	// Create ordered list: preferred first, then others
 	services := []string{preferredService}
 	for _, s := range allServices {
@@ -269,9 +330,12 @@ func DownloadWithFallback(requestJSON string) (string, error) {
 		}
 	}
 	
+	fmt.Printf("[DownloadWithFallback] Service order: %v\n", services)
+	
 	var lastErr error
 	
 	for _, service := range services {
+		fmt.Printf("[DownloadWithFallback] Trying service: %s\n", service)
 		req.Service = service
 		
 		var result DownloadResult
@@ -282,10 +346,18 @@ func DownloadWithFallback(requestJSON string) (string, error) {
 			tidalResult, tidalErr := downloadFromTidal(req)
 			if tidalErr == nil {
 				result = DownloadResult{
-					FilePath:   tidalResult.FilePath,
-					BitDepth:   tidalResult.BitDepth,
-					SampleRate: tidalResult.SampleRate,
+					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,
 				}
+			} else {
+				fmt.Printf("[DownloadWithFallback] Tidal error: %v\n", tidalErr)
 			}
 			err = tidalErr
 		case "qobuz":
@@ -296,16 +368,26 @@ func DownloadWithFallback(requestJSON string) (string, error) {
 					BitDepth:   qobuzResult.BitDepth,
 					SampleRate: qobuzResult.SampleRate,
 				}
+			} else {
+				fmt.Printf("[DownloadWithFallback] Qobuz error: %v\n", qobuzErr)
 			}
 			err = qobuzErr
 		case "amazon":
 			amazonResult, amazonErr := downloadFromAmazon(req)
 			if amazonErr == nil {
 				result = DownloadResult{
-					FilePath:   amazonResult.FilePath,
-					BitDepth:   amazonResult.BitDepth,
-					SampleRate: amazonResult.SampleRate,
+					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,
 				}
+			} else {
+				fmt.Printf("[DownloadWithFallback] Amazon error: %v\n", amazonErr)
 			}
 			err = amazonErr
 		}
@@ -313,17 +395,36 @@ func DownloadWithFallback(requestJSON string) (string, error) {
 		if err == nil {
 			// Check if file already 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:      result.FilePath[7:],
-					AlreadyExists: true,
-					Service:       service,
+					Success:          true,
+					Message:          "File already exists",
+					FilePath:         actualPath,
+					AlreadyExists:    true,
+					ActualBitDepth:   result.BitDepth,
+					ActualSampleRate: result.SampleRate,
+					Service:          service,
 				}
 				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
+				fmt.Printf("[Download] Actual quality from file: %d-bit/%dHz\n", quality.BitDepth, quality.SampleRate)
+			} else {
+				fmt.Printf("[Download] Could not read quality from file: %v\n", qErr)
+			}
+			
 			resp := DownloadResponse{
 				Success:          true,
 				Message:          "Downloaded from " + service,
@@ -398,6 +499,26 @@ func CheckDuplicate(outputDir, isrc string) (string, error) {
 	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{}
@@ -438,7 +559,7 @@ func FetchLyrics(spotifyID, trackName, artistName string) (string, error) {
 	return string(jsonBytes), nil
 }

-// GetLyricsLRC fetches lyrics and converts to LRC format string
+// 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)
@@ -456,7 +577,8 @@ func GetLyricsLRC(spotifyID, trackName, artistName string, filePath string) (str
 		return "", err
 	}

-	lrcContent := convertToLRC(lyricsData)
+	// Convert to LRC format with metadata headers (like PC version)
+	lrcContent := convertToLRCWithMetadata(lyricsData, trackName, artistName)
 	return lrcContent, nil
 }

@@ -476,10 +598,335 @@ 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)
+	}
+	
+	fmt.Printf("[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, "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
@@ -12,25 +12,59 @@ import (

 // 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 +77,7 @@ 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 +91,9 @@ 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)
@@ -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*\(feat\..*?\)`,
@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"os"
 	"strconv"
+	"strings"

 	"github.com/go-flac/flacpicture"
 	"github.com/go-flac/flacvorbis"
@@ -273,10 +274,16 @@ 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
@@ -375,6 +382,7 @@ type AudioQuality struct {

 // 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 {
@@ -382,45 +390,401 @@ func GetAudioQuality(filePath string) (AudioQuality, error) {
 	}
 	defer file.Close()

-	// Read FLAC marker (4 bytes: "fLaC")
+	// 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)
 	}
-	if string(marker) != "fLaC" {
-		return AudioQuality{}, fmt.Errorf("not a FLAC file")
-	}
+	
+	// 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)
+		}

-	// Read metadata block header (4 bytes)
-	// Byte 0: bit 7 = last block flag, bits 0-6 = block type (0 = STREAMINFO)
-	// Bytes 1-3: block length (24-bit big-endian)
-	header := make([]byte, 4)
-	if _, err := file.Read(header); err != nil {
+		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)
 	}
-
-	blockType := header[0] & 0x7F
-	if blockType != 0 {
-		return AudioQuality{}, fmt.Errorf("first block is not STREAMINFO")
+	
+	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)
 	}
-
-	// Read STREAMINFO block (34 bytes minimum)
-	// Bytes 10-13 contain sample rate (20 bits), channels (3 bits), bits per sample (5 bits)
-	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)
-	// Bytes 10-12: [SSSS SSSS] [SSSS SSSS] [SSSS CCCC] where S=sample rate, C=channels
-	sampleRate := (int(streamInfo[10]) << 12) | (int(streamInfo[11]) << 4) | (int(streamInfo[12]) >> 4)
-
-	// Parse bits per sample (5 bits)
-	// Byte 12 bits 0-3 and byte 13 bit 7: [.... BBBB] [B...] where B=bits per sample - 1
-	bitsPerSample := ((int(streamInfo[12]) & 0x01) << 4) | (int(streamInfo[13]) >> 4) + 1
-
-	return AudioQuality{
-		BitDepth:   bitsPerSample,
-		SampleRate: sampleRate,
-	}, nil
+	
+	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")
 }
@@ -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()
+}
@@ -3,6 +3,7 @@ package gobackend
 import (
 	"encoding/json"
 	"sync"
+	"time"
 )

 // DownloadProgress represents current download progress
@@ -23,6 +24,7 @@ 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"
 }
@@ -124,6 +126,20 @@ 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()
@@ -196,27 +212,55 @@ func getDownloadDir() string {

 // 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
 }
@@ -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 +48,82 @@ 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 different (one is ASCII, one is non-ASCII like Japanese/Chinese/Korean),
+	// assume they're the same artist with different transliteration
+	expectedASCII := qobuzIsASCIIString(expectedArtist)
+	foundASCII := qobuzIsASCIIString(foundArtist)
+	if expectedASCII != foundASCII {
+		fmt.Printf("[Qobuz] Artist names in different scripts, assuming match: '%s' vs '%s'\n", expectedArtist, foundArtist)
+		return true
+	}
+	
+	return false
+}
+
+// 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
@@ -112,11 +191,100 @@ 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) {
+	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
+	}
+
+	// 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])
+		}
+	}
+
+	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 30 seconds tolerance
+				if durationDiff <= 30 {
+					durationVerifiedMatches = append(durationVerifiedMatches, track)
+				}
+			}
+			
+			if len(durationVerifiedMatches) > 0 {
+				fmt.Printf("[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
+			fmt.Printf("[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
+		fmt.Printf("[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)
+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 +297,54 @@ 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)
+				fmt.Printf("[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
+
+		fmt.Printf("[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 +353,7 @@ func (q *QobuzDownloader) SearchTrackByMetadata(trackName, artistName string) (*

 		resp, err := DoRequestWithUserAgent(q.client, req)
 		if err != nil {
+			fmt.Printf("[Qobuz] Search error for '%s': %v\n", cleanQuery, err)
 			continue
 		}

@@ -159,19 +374,51 @@ 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]
+			fmt.Printf("[Qobuz] Found %d results for '%s'\n", len(result.Tracks.Items), cleanQuery)
+			allTracks = append(allTracks, result.Tracks.Items...)
+		}
+	}
+
+	if len(allTracks) == 0 {
+		return nil, fmt.Errorf("no tracks found for: %s - %s", artistName, trackName)
+	}
+
+	// If duration verification is requested
+	if expectedDurationSec > 0 {
+		var durationMatches []*QobuzTrack
+		for i := range allTracks {
+			track := &allTracks[i]
+			durationDiff := track.Duration - expectedDurationSec
+			if durationDiff < 0 {
+				durationDiff = -durationDiff
+			}
+			if durationDiff <= 30 {
+				durationMatches = append(durationMatches, track)
+			}
+		}
+
+		if len(durationMatches) > 0 {
+			// Return best quality among duration matches
+			for _, track := range durationMatches {
 				if track.MaximumBitDepth >= 24 {
 					return track, nil
 				}
 			}
-			// Return first result if no hi-res found
-			return &result.Tracks.Items[0], nil
+			return durationMatches[0], nil
 		}
+
+		// No duration match found
+		return nil, fmt.Errorf("no tracks found with matching duration (expected %ds)", expectedDurationSec)
 	}

-	return nil, fmt.Errorf("no tracks found for: %s - %s", artistName, trackName)
+	// No duration verification, return best quality
+	for i := range allTracks {
+		track := &allTracks[i]
+		if track.MaximumBitDepth >= 24 {
+			return track, nil
+		}
+	}
+	return &allTracks[0], nil
 }

 // getQobuzDownloadURLSequential requests download URL from APIs sequentially
@@ -283,33 +530,68 @@ 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 && 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 item 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 {
 		// Fallback: direct copy without progress tracking
-		_, err = io.Copy(out, resp.Body)
+		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
+	FilePath    string
+	BitDepth    int
+	SampleRate  int
+	Title       string
+	Artist      string
+	Album       string
+	ReleaseDate string
+	TrackNumber int
+	DiscNumber  int
 }

 // downloadFromQobuz downloads a track using the request parameters
@@ -321,27 +603,61 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 		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 {
+			fmt.Printf("[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 {
+				fmt.Printf("[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 != "" {
+		track, err = downloader.SearchTrackByISRCWithDuration(req.ISRC, expectedDurationSec)
+		// Verify artist
+		if track != nil && !qobuzArtistsMatch(req.ArtistName, track.Performer.Name) {
+			fmt.Printf("[Qobuz] Artist mismatch from ISRC search: expected '%s', got '%s'. Rejecting.\n", 
+				req.ArtistName, track.Performer.Name)
+			track = nil
+		}
+	}
+
+	// Strategy 2: Search by metadata with duration verification
 	if track == nil {
-		track, err = downloader.SearchTrackByMetadata(req.TrackName, req.ArtistName)
+		track, err = downloader.SearchTrackByMetadataWithDuration(req.TrackName, req.ArtistName, expectedDurationSec)
+		// Verify artist
+		if track != nil && !qobuzArtistsMatch(req.ArtistName, track.Performer.Name) {
+			fmt.Printf("[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 QobuzDownloadResult{}, fmt.Errorf("qobuz search failed: %s", errMsg)
 	}

+	// Log match found and cache the track ID
+	fmt.Printf("[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
 	filename := buildFilenameFromTemplate(req.FilenameFormat, map[string]interface{}{
 		"title":  req.TrackName,
@@ -384,11 +700,29 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 		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 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 != "" {
@@ -396,59 +730,55 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 		SetItemFinalizing(req.ItemID)
 	}

-	// Embed metadata
+	// Embed metadata using parallel-fetched cover data
+	// Use metadata from the actual Qobuz track found (more accurate than request)
 	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:       track.Album.Title,
+		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
+		fmt.Printf("[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 != "" {
+		fmt.Printf("[Qobuz] Embedding parallel-fetched lyrics (%d lines)...\n", len(parallelResult.LyricsData.Lines))
+		if embedErr := EmbedLyrics(outputPath, parallelResult.LyricsLRC); embedErr != nil {
+			fmt.Printf("[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")
 	}

+	// Add to ISRC index for fast duplicate checking
+	AddToISRCIndex(req.OutputDir, req.ISRC, outputPath)
+
 	return QobuzDownloadResult{
-		FilePath:   outputPath,
-		BitDepth:   actualBitDepth,
-		SampleRate: actualSampleRate,
+		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
 	}, nil
 }
@@ -0,0 +1,222 @@
+package gobackend
+
+import (
+	"strings"
+	"unicode"
+)
+
+// Hiragana to Romaji mapping
+var hiraganaToRomaji = map[rune]string{
+	'あ': "a", 'い': "i", 'う': "u", 'え': "e", 'お': "o",
+	'か': "ka", 'き': "ki", 'く': "ku", 'け': "ke", 'こ': "ko",
+	'さ': "sa", 'し': "shi", 'す': "su", 'せ': "se", 'そ': "so",
+	'た': "ta", 'ち': "chi", 'つ': "tsu", 'て': "te", 'と': "to",
+	'な': "na", 'に': "ni", 'ぬ': "nu", 'ね': "ne", 'の': "no",
+	'は': "ha", 'ひ': "hi", 'ふ': "fu", 'へ': "he", 'ほ': "ho",
+	'ま': "ma", 'み': "mi", 'む': "mu", 'め': "me", 'も': "mo",
+	'や': "ya", 'ゆ': "yu", 'よ': "yo",
+	'ら': "ra", 'り': "ri", 'る': "ru", 'れ': "re", 'ろ': "ro",
+	'わ': "wa", 'を': "wo", 'ん': "n",
+	// Dakuten (voiced)
+	'が': "ga", 'ぎ': "gi", 'ぐ': "gu", 'げ': "ge", 'ご': "go",
+	'ざ': "za", 'じ': "ji", 'ず': "zu", 'ぜ': "ze", 'ぞ': "zo",
+	'だ': "da", 'ぢ': "ji", 'づ': "zu", 'で': "de", 'ど': "do",
+	'ば': "ba", 'び': "bi", 'ぶ': "bu", 'べ': "be", 'ぼ': "bo",
+	// 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",
+}
+
+// Katakana to Romaji mapping
+var katakanaToRomaji = map[rune]string{
+	'ア': "a", 'イ': "i", 'ウ': "u", 'エ': "e", 'オ': "o",
+	'カ': "ka", 'キ': "ki", 'ク': "ku", 'ケ': "ke", 'コ': "ko",
+	'サ': "sa", 'シ': "shi", 'ス': "su", 'セ': "se", 'ソ': "so",
+	'タ': "ta", 'チ': "chi", 'ツ': "tsu", 'テ': "te", 'ト': "to",
+	'ナ': "na", 'ニ': "ni", 'ヌ': "nu", 'ネ': "ne", 'ノ': "no",
+	'ハ': "ha", 'ヒ': "hi", 'フ': "fu", 'ヘ': "he", 'ホ': "ho",
+	'マ': "ma", 'ミ': "mi", 'ム': "mu", 'メ': "me", 'モ': "mo",
+	'ヤ': "ya", 'ユ': "yu", 'ヨ': "yo",
+	'ラ': "ra", 'リ': "ri", 'ル': "ru", 'レ': "re", 'ロ': "ro",
+	'ワ': "wa", 'ヲ': "wo", 'ン': "n",
+	// Dakuten (voiced)
+	'ガ': "ga", 'ギ': "gi", 'グ': "gu", 'ゲ': "ge", 'ゴ': "go",
+	'ザ': "za", 'ジ': "ji", 'ズ': "zu", 'ゼ': "ze", 'ゾ': "zo",
+	'ダ': "da", 'ヂ': "ji", 'ヅ': "zu", 'デ': "de", 'ド': "do",
+	'バ': "ba", 'ビ': "bi", 'ブ': "bu", 'ベ': "be", 'ボ': "bo",
+	// 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",
+	// Extended katakana
+	'ー': "", // Long vowel mark
+	'ヴ': "vu",
+}
+
+// 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",
+	"にゃ": "nya", "にゅ": "nyu", "にょ": "nyo",
+	"ひゃ": "hya", "ひゅ": "hyu", "ひょ": "hyo",
+	"みゃ": "mya", "みゅ": "myu", "みょ": "myo",
+	"りゃ": "rya", "りゅ": "ryu", "りょ": "ryo",
+	"ぎゃ": "gya", "ぎゅ": "gyu", "ぎょ": "gyo",
+	"じゃ": "ja", "じゅ": "ju", "じょ": "jo",
+	"びゃ": "bya", "びゅ": "byu", "びょ": "byo",
+	"ぴゃ": "pya", "ぴゅ": "pyu", "ぴょ": "pyo",
+}
+
+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",
+	"ニャ": "nya", "ニュ": "nyu", "ニョ": "nyo",
+	"ヒャ": "hya", "ヒュ": "hyu", "ヒョ": "hyo",
+	"ミャ": "mya", "ミュ": "myu", "ミョ": "myo",
+	"リャ": "rya", "リュ": "ryu", "リョ": "ryo",
+	"ギャ": "gya", "ギュ": "gyu", "ギョ": "gyo",
+	"ジャ": "ja", "ジュ": "ju", "ジョ": "jo",
+	"ビャ": "bya", "ビュ": "byu", "ビョ": "byo",
+	"ピャ": "pya", "ピュ": "pyu", "ピョ": "pyo",
+	// Extended combinations
+	"ティ": "ti", "ディ": "di", "トゥ": "tu", "ドゥ": "du",
+	"ファ": "fa", "フィ": "fi", "フェ": "fe", "フォ": "fo",
+	"ウィ": "wi", "ウェ": "we", "ウォ": "wo",
+}
+
+// ContainsJapanese checks if a string contains Japanese characters
+func ContainsJapanese(s string) bool {
+	for _, r := range s {
+		if isHiragana(r) || isKatakana(r) || isKanji(r) {
+			return true
+		}
+	}
+	return false
+}
+
+func isHiragana(r rune) bool {
+	return r >= 0x3040 && r <= 0x309F
+}
+
+func isKatakana(r rune) bool {
+	return r >= 0x30A0 && r <= 0x30FF
+}
+
+func isKanji(r rune) bool {
+	return (r >= 0x4E00 && r <= 0x9FFF) || // CJK Unified Ideographs
+		(r >= 0x3400 && r <= 0x4DBF) // CJK Unified Ideographs Extension A
+}
+
+// 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
+	}
+
+	var result strings.Builder
+	runes := []rune(text)
+	i := 0
+
+	for i < len(runes) {
+		// Check for っ/ッ (double consonant)
+		if i < len(runes)-1 && (runes[i] == 'っ' || runes[i] == 'ッ') {
+			nextRomaji := ""
+			if romaji, ok := hiraganaToRomaji[runes[i+1]]; ok {
+				nextRomaji = romaji
+			} else if romaji, ok := katakanaToRomaji[runes[i+1]]; ok {
+				nextRomaji = romaji
+			}
+			if len(nextRomaji) > 0 {
+				result.WriteByte(nextRomaji[0]) // Double the first consonant
+			}
+			i++
+			continue
+		}
+
+		// Check for two-character combinations
+		if i < len(runes)-1 {
+			combo := string(runes[i : i+2])
+			if romaji, ok := combinationHiragana[combo]; ok {
+				result.WriteString(romaji)
+				i += 2
+				continue
+			}
+			if romaji, ok := combinationKatakana[combo]; ok {
+				result.WriteString(romaji)
+				i += 2
+				continue
+			}
+		}
+
+		// Single character conversion
+		r := runes[i]
+		if romaji, ok := hiraganaToRomaji[r]; ok {
+			result.WriteString(romaji)
+		} else if romaji, ok := katakanaToRomaji[r]; ok {
+			result.WriteString(romaji)
+		} else if isKanji(r) {
+			// Keep kanji as-is (would need dictionary for proper conversion)
+			result.WriteRune(r)
+		} else {
+			// Keep other characters (punctuation, spaces, etc.)
+			result.WriteRune(r)
+		}
+		i++
+	}
+
+	return result.String()
+}
+
+// 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)
+
+	// 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 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)
+}
@@ -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
+}
@@ -495,6 +495,17 @@ func (c *SpotifyMetadataClient) fetchAlbum(ctx context.Context, albumID, token s
 	}
 	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"`
@@ -502,15 +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"`
 	}

@@ -527,10 +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,
@@ -566,7 +598,49 @@ func (c *SpotifyMetadataClient) fetchAlbum(ctx context.Context, albumID, token s
 	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"`
@@ -577,7 +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"`
 	}

@@ -591,7 +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
@@ -615,6 +693,51 @@ 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,
@@ -781,8 +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)
 	}
@@ -809,13 +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,
 	)
 }

@@ -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++";
@@ -181,6 +181,67 @@ import Gobackend  // Import Go framework
            GobackendCleanupConnections()
            return nil
            
+        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
+            
        default:
            throw NSError(
                domain: "SpotiFLAC",
@@ -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"}}
@@ -1,8 +1,8 @@
 /// App version and info constants
 /// Update version here only - all other files will reference this
 class AppInfo {
-  static const String version = '2.0.3';
-  static const String buildNumber = '33';
+  static const String version = '2.1.7';
+  static const String buildNumber = '45';
  static const String fullVersion = '$version+$buildNumber';
  
  
@@ -15,4 +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';
 }
@@ -13,6 +13,14 @@ enum DownloadStatus {
  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;
@@ -20,8 +28,10 @@ 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

@@ -31,8 +41,10 @@ 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,
  });
@@ -43,8 +55,10 @@ class DownloadItem {
    String? service,
    DownloadStatus? status,
    double? progress,
+    double? speedMBps,
    String? filePath,
    String? error,
+    DownloadErrorType? errorType,
    DateTime? createdAt,
    String? qualityOverride,
  }) {
@@ -54,13 +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);
@@ -14,8 +14,10 @@ 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?,
 );
@@ -27,8 +29,10 @@ 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': _$DownloadErrorTypeEnumMap[instance.errorType],
      'createdAt': instance.createdAt.toIso8601String(),
      'qualityOverride': instance.qualityOverride,
    };
@@ -41,3 +45,10 @@ const _$DownloadStatusEnumMap = {
  DownloadStatus.failed: 'failed',
  DownloadStatus.skipped: 'skipped',
 };
+
+const _$DownloadErrorTypeEnumMap = {
+  DownloadErrorType.unknown: 'unknown',
+  DownloadErrorType.notFound: 'notFound',
+  DownloadErrorType.rateLimit: 'rateLimit',
+  DownloadErrorType.network: 'network',
+};
@@ -14,6 +14,7 @@ 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
@@ -21,9 +22,10 @@ class AppSettings {
  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

  const AppSettings({
-    this.defaultService = 'tidal',
+    this.defaultService = 'qobuz',
    this.audioQuality = 'LOSSLESS',
    this.filenameFormat = '{title} - {artist}',
    this.downloadDirectory = '',
@@ -33,6 +35,7 @@ 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
@@ -40,6 +43,7 @@ class AppSettings {
    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)
  });

  AppSettings copyWith({
@@ -53,6 +57,7 @@ class AppSettings {
    bool? isFirstLaunch,
    int? concurrentDownloads,
    bool? checkForUpdates,
+    String? updateChannel,
    bool? hasSearchedBefore,
    String? folderOrganization,
    String? historyViewMode,
@@ -60,6 +65,7 @@ class AppSettings {
    String? spotifyClientId,
    String? spotifyClientSecret,
    bool? useCustomSpotifyCredentials,
+    String? metadataSource,
  }) {
    return AppSettings(
      defaultService: defaultService ?? this.defaultService,
@@ -72,6 +78,7 @@ 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,
@@ -79,6 +86,7 @@ class AppSettings {
      spotifyClientId: spotifyClientId ?? this.spotifyClientId,
      spotifyClientSecret: spotifyClientSecret ?? this.spotifyClientSecret,
      useCustomSpotifyCredentials: useCustomSpotifyCredentials ?? this.useCustomSpotifyCredentials,
+      metadataSource: metadataSource ?? this.metadataSource,
    );
  }

@@ -17,6 +17,7 @@ AppSettings _$AppSettingsFromJson(Map<String, dynamic> json) => AppSettings(
  isFirstLaunch: json['isFirstLaunch'] as bool? ?? true,
  concurrentDownloads: (json['concurrentDownloads'] as num?)?.toInt() ?? 1,
  checkForUpdates: json['checkForUpdates'] as bool? ?? true,
+  updateChannel: json['updateChannel'] as String? ?? 'stable',
  hasSearchedBefore: json['hasSearchedBefore'] as bool? ?? false,
  folderOrganization: json['folderOrganization'] as String? ?? 'none',
  historyViewMode: json['historyViewMode'] as String? ?? 'grid',
@@ -25,6 +26,7 @@ AppSettings _$AppSettingsFromJson(Map<String, dynamic> json) => AppSettings(
  spotifyClientSecret: json['spotifyClientSecret'] as String? ?? '',
  useCustomSpotifyCredentials:
      json['useCustomSpotifyCredentials'] as bool? ?? true,
+  metadataSource: json['metadataSource'] as String? ?? 'deezer',
 );

 Map<String, dynamic> _$AppSettingsToJson(AppSettings instance) =>
@@ -39,6 +41,7 @@ Map<String, dynamic> _$AppSettingsToJson(AppSettings instance) =>
      'isFirstLaunch': instance.isFirstLaunch,
      'concurrentDownloads': instance.concurrentDownloads,
      'checkForUpdates': instance.checkForUpdates,
+      'updateChannel': instance.updateChannel,
      'hasSearchedBefore': instance.hasSearchedBefore,
      'folderOrganization': instance.folderOrganization,
      'historyViewMode': instance.historyViewMode,
@@ -46,4 +49,5 @@ Map<String, dynamic> _$AppSettingsToJson(AppSettings instance) =>
      'spotifyClientId': instance.spotifyClientId,
      'spotifyClientSecret': instance.spotifyClientSecret,
      'useCustomSpotifyCredentials': instance.useCustomSpotifyCredentials,
+      'metadataSource': instance.metadataSource,
    };
@@ -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
@@ -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) =>
@@ -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,
 };
@@ -4,8 +4,6 @@ import 'dart:io';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:path_provider/path_provider.dart';
 import 'package:shared_preferences/shared_preferences.dart';
-import 'package:ffmpeg_kit_flutter_new_audio/ffmpeg_kit.dart';
-import 'package:ffmpeg_kit_flutter_new_audio/return_code.dart';
 import 'package:spotiflac_android/models/download_item.dart';
 import 'package:spotiflac_android/models/settings.dart';
 import 'package:spotiflac_android/models/track.dart';
@@ -373,6 +371,7 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
          final itemProgress = entry.value as Map<String, dynamic>;
          final bytesReceived = itemProgress['bytes_received'] as int? ?? 0;
          final bytesTotal = itemProgress['bytes_total'] as int? ?? 0;
+          final speedMBps = (itemProgress['speed_mbps'] as num?)?.toDouble() ?? 0.0;
          final isDownloading = itemProgress['is_downloading'] as bool? ?? false;
          final status = itemProgress['status'] as String? ?? 'downloading';
          
@@ -391,14 +390,29 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
            continue;
          }
          
-          if (isDownloading && bytesTotal > 0) {
-            final percentage = bytesReceived / bytesTotal;
-            updateProgress(itemId, percentage);
+          // Use progress from backend if available (handles both explicit progress and byte-based)
+          final progressFromBackend = (itemProgress['progress'] as num?)?.toDouble() ?? 0.0;
+          
+          if (isDownloading) {
+            double percentage = 0.0;
+            if (bytesTotal > 0) {
+               // Calculate from bytes if available for precision
+               percentage = bytesReceived / bytesTotal;
+            } else {
+               // Fallback to backend-reported progress (e.g. for DASH segments)
+               percentage = progressFromBackend;
+            }
            
-            // Log progress for each item
+            updateProgress(itemId, percentage, speedMBps: speedMBps);
+            
+            // Log progress for each item with speed
            final mbReceived = bytesReceived / (1024 * 1024);
            final mbTotal = bytesTotal / (1024 * 1024);
-            _log.d('Progress [$itemId]: ${(percentage * 100).toStringAsFixed(1)}% (${mbReceived.toStringAsFixed(2)}/${mbTotal.toStringAsFixed(2)} MB)');
+            if (bytesTotal > 0) {
+              _log.d('Progress [$itemId]: ${(percentage * 100).toStringAsFixed(1)}% (${mbReceived.toStringAsFixed(2)}/${mbTotal.toStringAsFixed(2)} MB) @ ${speedMBps.toStringAsFixed(2)} MB/s');
+            } else {
+              _log.d('Progress [$itemId]: ${(percentage * 100).toStringAsFixed(1)}% (DASH segments/unknown size) @ ${speedMBps.toStringAsFixed(2)} MB/s');
+            }
          }
        }
        
@@ -429,11 +443,22 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
                ? downloadingItems.first.track.artistName 
                : 'Downloading...';
            
+            // Calculate notification progress values
+            int notifProgress = bytesReceived;
+            int notifTotal = bytesTotal;
+            
+            if (bytesTotal <= 0) {
+              // Fallback to percentage for DASH/unknown size
+              final progressPercent = (firstProgress['progress'] as num?)?.toDouble() ?? 0.0;
+              notifProgress = (progressPercent * 100).toInt();
+              notifTotal = 100;
+            }
+            
            _notificationService.showDownloadProgress(
              trackName: trackName,
              artistName: artistName,
-              progress: bytesReceived,
-              total: bytesTotal > 0 ? bytesTotal : 1,
+              progress: notifProgress,
+              total: notifTotal > 0 ? notifTotal : 1,
            );
            
            // Update foreground service notification (Android)
@@ -441,8 +466,8 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
              PlatformBridge.updateDownloadServiceProgress(
                trackName: downloadingItems.first.track.name,
                artistName: downloadingItems.first.track.artistName,
-                progress: bytesReceived,
-                total: bytesTotal > 0 ? bytesTotal : 1,
+                progress: notifProgress,
+                total: notifTotal > 0 ? notifTotal : 1,
                queueCount: state.queuedCount,
              ).catchError((_) {}); // Ignore errors
            }
@@ -611,14 +636,16 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
    }
  }

-  void updateItemStatus(String id, DownloadStatus status, {double? progress, String? filePath, String? error}) {
+  void updateItemStatus(String id, DownloadStatus status, {double? progress, double? speedMBps, String? filePath, String? error, DownloadErrorType? errorType}) {
    final items = state.items.map((item) {
      if (item.id == id) {
        return item.copyWith(
          status: status,
          progress: progress ?? item.progress,
+          speedMBps: speedMBps ?? item.speedMBps,
          filePath: filePath,
          error: error,
+          errorType: errorType,
        );
      }
      return item;
@@ -634,8 +661,8 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
    }
  }

-  void updateProgress(String id, double progress) {
-    updateItemStatus(id, DownloadStatus.downloading, progress: progress);
+  void updateProgress(String id, double progress, {double? speedMBps}) {
+    updateItemStatus(id, DownloadStatus.downloading, progress: progress, speedMBps: speedMBps);
  }

  void cancelItem(String id) {
@@ -688,20 +715,37 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
    }
  }

-  /// Retry a failed download
+  /// Retry a failed or skipped download
  void retryItem(String id) {
-    final items = state.items.map((item) {
-      if (item.id == id && item.status == DownloadStatus.failed) {
-        return item.copyWith(status: DownloadStatus.queued, progress: 0, error: null);
+    final item = state.items.where((i) => i.id == id).firstOrNull;
+    if (item == null) {
+      _log.w('retryItem: Item not found: $id');
+      return;
+    }
+    
+    // Only retry if status is failed or skipped
+    if (item.status != DownloadStatus.failed && item.status != DownloadStatus.skipped) {
+      _log.w('retryItem: Item status is ${item.status}, not retrying');
+      return;
+    }
+    
+    _log.i('Retrying item: ${item.track.name} (id: $id)');
+    
+    final items = state.items.map((i) {
+      if (i.id == id) {
+        return i.copyWith(status: DownloadStatus.queued, progress: 0, error: null);
      }
-      return item;
+      return i;
    }).toList();
    state = state.copyWith(items: items);
    _saveQueueToStorage(); // Persist queue
    
-    // Start processing if not already
+    // Start processing if not already running
    if (!state.isProcessing) {
+      _log.d('Starting queue processing for retry');
      Future.microtask(() => _processQueue());
+    } else {
+      _log.d('Queue already processing, item will be picked up');
    }
  }

@@ -717,18 +761,21 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
    // Download cover first
    String? coverPath;
    if (track.coverUrl != null && track.coverUrl!.isNotEmpty) {
-      coverPath = '$flacPath.cover.jpg';
      try {
+        final tempDir = await getTemporaryDirectory();
+        final uniqueId = DateTime.now().millisecondsSinceEpoch;
+        coverPath = '${tempDir.path}/cover_$uniqueId.jpg';
+        
        // Download cover using HTTP
        final httpClient = HttpClient();
        final request = await httpClient.getUrl(Uri.parse(track.coverUrl!));
        final response = await request.close();
        if (response.statusCode == 200) {
-          final file = File(coverPath);
+          final file = File(coverPath!);
          final sink = file.openWrite();
          await response.pipe(sink);
          await sink.close();
-          _log.d('Cover downloaded to: $coverPath');
+          _log.d('Cover downloaded to temp: $coverPath');
        } else {
          _log.w('Failed to download cover: HTTP ${response.statusCode}');
          coverPath = null;
@@ -742,33 +789,85 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {

    // Use Go backend to embed metadata
    try {
-      // For now, we'll use FFmpeg to embed cover since Go backend expects to download the file
-      // FFmpeg can embed cover art to FLAC
-      if (coverPath != null && await File(coverPath).exists()) {
-        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';
+      // Use FFmpeg to embed cover art AND text metadata
+      // FFmpeg can embed cover art to FLAC and also set tags
+      
+      // Construct metadata map
+      final metadata = <String, String>{
+        'TITLE': track.name,
+        'ARTIST': track.artistName,
+        'ALBUM': track.albumName,
+      };
+      
+      if (track.albumArtist != null) {
+        metadata['ALBUMARTIST'] = track.albumArtist!;
+      }
+      
+      if (track.trackNumber != null) {
+        metadata['TRACKNUMBER'] = track.trackNumber.toString();
+        metadata['TRACK'] = track.trackNumber.toString(); // Compatibility
+      }
+      
+      if (track.discNumber != null) {
+        metadata['DISCNUMBER'] = track.discNumber.toString();
+        metadata['DISC'] = track.discNumber.toString(); // Compatibility
+      }
+      
+      if (track.releaseDate != null) {
+        metadata['DATE'] = track.releaseDate!;
+        metadata['YEAR'] = track.releaseDate!.split('-').first;
+      }
+      
+      if (track.isrc != null) {
+        metadata['ISRC'] = track.isrc!;
+      }
+
+      // Fetch Lyrics (Critical for M4A->FLAC conversion parity)
+      // Since we are in the Flutter context, we can call the bridge to get lyrics
+      // This ensures even converted files have lyrics embedded if available
+      try {
+        final lrcContent = await PlatformBridge.getLyricsLRC(
+          track.id, // spotifyID
+          track.name,
+          track.artistName,
+          filePath: '', // No local file path yet (processed in memory)
+        );
        
-        final session = await FFmpegKit.execute(command);
-        final returnCode = await session.getReturnCode();
-        
-        if (ReturnCode.isSuccess(returnCode)) {
-          // Replace original with temp
-          await File(flacPath).delete();
-          await File(tempOutput).rename(flacPath);
-          _log.d('Cover embedded via FFmpeg');
-        } else {
-          // Try alternative method using metaflac-style embedding
-          _log.w('FFmpeg cover embed failed, trying alternative...');
-          // Clean up temp file if exists
-          final tempFile = File(tempOutput);
-          if (await tempFile.exists()) {
-            await tempFile.delete();
-          }
+        if (lrcContent != null && lrcContent.isNotEmpty) {
+          metadata['LYRICS'] = lrcContent;
+          metadata['UNSYNCEDLYRICS'] = lrcContent; // Fallback for some players
+          _log.d('Lyrics fetched for embedding (${lrcContent.length} chars)');
        }
-        
-        // Clean up cover file
+      } catch (e) {
+         _log.w('Failed to fetch lyrics for embedding: $e');
+      }
+      
+      _log.d('Generating tags for FLAC: $metadata');
+      
+      // Perform embedding (cover + text metadata)
+      // Note: FFmpegService.embedMetadata handles safe temp file creation
+      final result = await FFmpegService.embedMetadata(
+        flacPath: flacPath,
+        coverPath: coverPath != null && await File(coverPath).exists() ? coverPath : null,
+        metadata: metadata,
+      );
+      
+      if (result != null) {
+        _log.d('Metadata and cover embedded via FFmpeg');
+      } else {
+        _log.w('FFmpeg metadata/cover embed failed');
+      }
+      
+      // Clean up cover file if it exists
+      if (coverPath != null) {
        try {
-          await File(coverPath).delete();
+          final coverFile = File(coverPath);
+          if (await coverFile.exists()) {
+             // In Android 10+ scoped storage, we can't easily delete if we didn't create it 
+             // in this session or if it's not in our app dir. 
+             // But coverPath is typically in temp dir now.
+            await coverFile.delete();
+          }
        } catch (_) {}
      }
    } catch (e) {
@@ -866,6 +965,13 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
    
    _log.i('Queue processing finished');
    state = state.copyWith(isProcessing: false, currentDownload: null);
+    
+    // Check if there are new queued items (e.g., from retry) and restart if needed
+    final hasQueuedItems = state.items.any((item) => item.status == DownloadStatus.queued);
+    if (hasQueuedItems) {
+      _log.i('Found queued items after processing finished, restarting queue...');
+      Future.microtask(() => _processQueue());
+    }
  }

  /// Sequential download processing (uses multi-progress system with single item)
@@ -881,7 +987,9 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
        continue;
      }
      
-      final nextItem = state.items.firstWhere(
+      // Re-read state to get latest items (important for retry)
+      final currentItems = state.items;
+      final nextItem = currentItems.firstWhere(
        (item) => item.status == DownloadStatus.queued,
        orElse: () => DownloadItem(
          id: '',
@@ -892,10 +1000,11 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
      );

      if (nextItem.id.isEmpty) {
-        _log.d('No more items to process');
+        _log.d('No more items to process (checked ${currentItems.length} items)');
        break;
      }

+      _log.d('Processing next item: ${nextItem.track.name} (id: ${nextItem.id})');
      await _downloadSingleItem(nextItem);
      
      // Clear item progress after download completes
@@ -980,7 +1089,49 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
    try {
      // Get folder organization setting and build output directory
      final settings = ref.read(settingsProvider);
-      final outputDir = await _buildOutputDir(item.track, settings.folderOrganization);
+      
+      // Metadata Enrichment:
+      // If track number is missing/0 (common from Search results), fetch full metadata
+      // This ensures the downloaded file has correct tags (Track, Disc, Year)
+      Track trackToDownload = item.track;
+      if (trackToDownload.trackNumber == null || trackToDownload.trackNumber == 0) {
+        try {
+          if (trackToDownload.id.startsWith('deezer:')) {
+            _log.d('Enriching incomplete metadata for Deezer track: ${trackToDownload.name}');
+            final rawId = trackToDownload.id.split(':')[1];
+            final fullData = await PlatformBridge.getDeezerMetadata('track', rawId);
+            
+            if (fullData.containsKey('track')) {
+               final fullTrack = Track.fromJson(fullData['track'] as Map<String, dynamic>);
+               // Merge with existing (keep override quality/service if any, but update metadata)
+               trackToDownload = Track(
+                 id: fullTrack.id.isNotEmpty ? fullTrack.id : trackToDownload.id,
+                 name: fullTrack.name,
+                 artistName: fullTrack.artistName,
+                 albumName: fullTrack.albumName,
+                 albumArtist: fullTrack.albumArtist,
+                 coverUrl: fullTrack.coverUrl,
+                 duration: fullTrack.duration,
+                 isrc: fullTrack.isrc ?? trackToDownload.isrc,
+                 trackNumber: fullTrack.trackNumber,
+                 discNumber: fullTrack.discNumber,
+                 releaseDate: fullTrack.releaseDate,
+                 deezerId: fullTrack.deezerId,
+                 availability: trackToDownload.availability,
+               );
+               _log.d('Metadata enriched: Track ${trackToDownload.trackNumber}, Disc ${trackToDownload.discNumber}, Year ${trackToDownload.releaseDate}');
+               
+               // Update item in state with enriched track
+               // This is important so the UI (and history) reflects the enriched data
+               // We don't perform a full `updateItemStatus` here to avoid UI flicker, just local var
+            }
+          }
+        } catch (e) {
+          _log.w('Failed to enrich metadata: $e');
+        }
+      }
+      
+      final outputDir = await _buildOutputDir(trackToDownload, settings.folderOrganization);
      
      // Use quality override if set, otherwise use default from settings
      final quality = item.qualityOverride ?? state.audioQuality;
@@ -992,39 +1143,41 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
        _log.d('Quality: $quality${item.qualityOverride != null ? ' (override)' : ''}');
        _log.d('Output dir: $outputDir');
        result = await PlatformBridge.downloadWithFallback(
-          isrc: item.track.isrc ?? '',
-          spotifyId: item.track.id,
-          trackName: item.track.name,
-          artistName: item.track.artistName,
-          albumName: item.track.albumName,
-          albumArtist: item.track.albumArtist,
-          coverUrl: item.track.coverUrl,
+          isrc: trackToDownload.isrc ?? '',
+          spotifyId: trackToDownload.id,
+          trackName: trackToDownload.name,
+          artistName: trackToDownload.artistName,
+          albumName: trackToDownload.albumName,
+          albumArtist: trackToDownload.albumArtist,
+          coverUrl: trackToDownload.coverUrl,
          outputDir: outputDir,
          filenameFormat: state.filenameFormat,
          quality: quality,
-          trackNumber: item.track.trackNumber ?? 1,
-          discNumber: item.track.discNumber ?? 1,
-          releaseDate: item.track.releaseDate,
+          trackNumber: trackToDownload.trackNumber ?? 1,
+          discNumber: trackToDownload.discNumber ?? 1,
+          releaseDate: trackToDownload.releaseDate,
          preferredService: item.service,
          itemId: item.id, // Pass item ID for progress tracking
+          durationMs: trackToDownload.duration, // Duration in ms for verification
        );
      } else {
        result = await PlatformBridge.downloadTrack(
-          isrc: item.track.isrc ?? '',
+          isrc: trackToDownload.isrc ?? '',
          service: item.service,
-          spotifyId: item.track.id,
-          trackName: item.track.name,
-          artistName: item.track.artistName,
-          albumName: item.track.albumName,
-          albumArtist: item.track.albumArtist,
-          coverUrl: item.track.coverUrl,
+          spotifyId: trackToDownload.id,
+          trackName: trackToDownload.name,
+          artistName: trackToDownload.artistName,
+          albumName: trackToDownload.albumName,
+          albumArtist: trackToDownload.albumArtist,
+          coverUrl: trackToDownload.coverUrl,
          outputDir: outputDir,
          filenameFormat: state.filenameFormat,
          quality: quality,
-          trackNumber: item.track.trackNumber ?? 1,
-          discNumber: item.track.discNumber ?? 1,
-          releaseDate: item.track.releaseDate,
+          trackNumber: trackToDownload.trackNumber ?? 1,
+          discNumber: trackToDownload.discNumber ?? 1,
+          releaseDate: trackToDownload.releaseDate,
          itemId: item.id, // Pass item ID for progress tracking
+          durationMs: trackToDownload.duration, // Duration in ms for verification
        );
      }
      
@@ -1068,26 +1221,74 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
          _log.i('Actual quality: $actualQuality');
        }
        
-        // Check if file is M4A (DASH stream from Tidal) and needs remuxing to FLAC
-        if (filePath != null && filePath.endsWith('.m4a')) {
-          _log.d('Converting M4A to FLAC...');
-          updateItemStatus(item.id, DownloadStatus.downloading, progress: 0.9);
-          final flacPath = await FFmpegService.convertM4aToFlac(filePath);
-          if (flacPath != null) {
-            filePath = flacPath;
-            _log.d('Converted to: $flacPath');
-            
-            // After conversion, embed metadata and cover to the new FLAC file
-            _log.d('Embedding metadata and cover to converted FLAC...');
-            try {
-              await _embedMetadataAndCover(
-                flacPath,
-                item.track,
-              );
-              _log.d('Metadata and cover embedded successfully');
-            } catch (e) {
-              _log.w('Warning: Failed to embed metadata/cover: $e');
+        // M4A files from Tidal DASH streams - try to convert to FLAC
+        // M4A files from Tidal DASH streams - try to convert to FLAC
+        if (filePath != null && filePath!.endsWith('.m4a')) {
+          _log.d('M4A file detected (Hi-Res DASH stream), attempting conversion to FLAC...');
+          
+          try {
+            final file = File(filePath!);
+            if (!await file.exists()) {
+               _log.e('File does not exist at path: $filePath');
+            } else {
+              final length = await file.length();
+              _log.i('File size before conversion: ${length / 1024} KB');
+              
+              if (length < 1024) {
+                 _log.w('File is too small (<1KB), skipping conversion. Download might be corrupt.');
+              } else {
+                updateItemStatus(item.id, DownloadStatus.downloading, progress: 0.95);
+                final flacPath = await FFmpegService.convertM4aToFlac(filePath!);
+                
+                if (flacPath != null) {
+                  filePath = flacPath;
+                  _log.d('Converted to FLAC: $flacPath');
+                  
+                  // After conversion, embed metadata and cover to the new FLAC file
+                  _log.d('Embedding metadata and cover to converted FLAC...');
+                  try {
+                    // Update track with actual metadata from backend result (if available)
+                    // This creates the most accurate metadata possible (from the service itself)
+                    Track finalTrack = trackToDownload;
+                    if (result.containsKey('track_number') || result.containsKey('release_date')) {
+                       _log.d('Using metadata from backend response for embedding');
+                       final backendTrackNum = result['track_number'] as int?;
+                       final backendDiscNum = result['disc_number'] as int?;
+                       final backendYear = result['release_date'] as String?;
+                       final backendAlbum = result['album'] as String?;
+                       
+                       // Create updated track object
+                       finalTrack = Track(
+                         id: trackToDownload.id,
+                         name: trackToDownload.name,
+                         artistName: trackToDownload.artistName,
+                         albumName: backendAlbum ?? trackToDownload.albumName,
+                         albumArtist: trackToDownload.albumArtist,
+                         coverUrl: trackToDownload.coverUrl,
+                         duration: trackToDownload.duration,
+                         isrc: trackToDownload.isrc,
+                         trackNumber: (backendTrackNum != null && backendTrackNum > 0) ? backendTrackNum : trackToDownload.trackNumber,
+                         discNumber: (backendDiscNum != null && backendDiscNum > 0) ? backendDiscNum : trackToDownload.discNumber,
+                         releaseDate: backendYear ?? trackToDownload.releaseDate,
+                         deezerId: trackToDownload.deezerId,
+                         availability: trackToDownload.availability,
+                       );
+                    }
+
+                    // Use enriched/updated track for metadata embedding
+                    await _embedMetadataAndCover(flacPath, finalTrack);
+                    _log.d('Metadata and cover embedded successfully');
+                  } catch (e) {
+                    _log.w('Warning: Failed to embed metadata/cover: $e');
+                  }
+                } else {
+                  _log.w('FFmpeg conversion returned null, keeping M4A file');
+                }
+              }
            }
+          } catch (e) {
+            _log.w('FFmpeg conversion process failed: $e, keeping M4A file');
+            // Keep the M4A file if conversion fails
          }
        }
        
@@ -1129,12 +1330,20 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
        );

        if (filePath != null) {
+          // Extract updated metadata from backend result if available
+          final backendTitle = result['title'] as String?;
+          final backendArtist = result['artist'] as String?;
+          final backendAlbum = result['album'] as String?;
+          final backendYear = result['release_date'] as String?;
+          final backendTrackNum = result['track_number'] as int?;
+          final backendDiscNum = result['disc_number'] as int?;
+
          ref.read(downloadHistoryProvider.notifier).addToHistory(
            DownloadHistoryItem(
              id: item.id,
-              trackName: item.track.name,
-              artistName: item.track.artistName,
-              albumName: item.track.albumName,
+              trackName: (backendTitle != null && backendTitle.isNotEmpty) ? backendTitle : item.track.name,
+              artistName: (backendArtist != null && backendArtist.isNotEmpty) ? backendArtist : item.track.artistName,
+              albumName: (backendAlbum != null && backendAlbum.isNotEmpty) ? backendAlbum : item.track.albumName,
              albumArtist: item.track.albumArtist,
              coverUrl: item.track.coverUrl,
              filePath: filePath,
@@ -1143,10 +1352,10 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
              // Additional metadata
              isrc: item.track.isrc,
              spotifyId: item.track.id,
-              trackNumber: item.track.trackNumber,
-              discNumber: item.track.discNumber,
+              trackNumber: (backendTrackNum != null && backendTrackNum > 0) ? backendTrackNum : item.track.trackNumber,
+              discNumber: (backendDiscNum != null && backendDiscNum > 0) ? backendDiscNum : item.track.discNumber,
              duration: item.track.duration,
-              releaseDate: item.track.releaseDate,
+              releaseDate: (backendYear != null && backendYear.isNotEmpty) ? backendYear : item.track.releaseDate,
              quality: actualQuality,
            ),
          );
@@ -1156,11 +1365,30 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
        }
      } else {
        final errorMsg = result['error'] as String? ?? 'Download failed';
-        _log.e('Download failed: $errorMsg');
+        final errorTypeStr = result['error_type'] as String? ?? 'unknown';
+        
+        // Convert error type string to enum
+        DownloadErrorType errorType;
+        switch (errorTypeStr) {
+          case 'not_found':
+            errorType = DownloadErrorType.notFound;
+            break;
+          case 'rate_limit':
+            errorType = DownloadErrorType.rateLimit;
+            break;
+          case 'network':
+            errorType = DownloadErrorType.network;
+            break;
+          default:
+            errorType = DownloadErrorType.unknown;
+        }
+        
+        _log.e('Download failed: $errorMsg (type: $errorTypeStr)');
        updateItemStatus(
          item.id,
          DownloadStatus.failed,
          error: errorMsg,
+          errorType: errorType,
        );
        _failedInSession++;
      }
@@ -1177,10 +1405,22 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
      }
    } catch (e, stackTrace) {
      _log.e('Exception: $e', e, stackTrace);
+      
+      String errorMsg = e.toString();
+      DownloadErrorType errorType = DownloadErrorType.unknown;
+
+      // Check for specific Deezer fallback error
+      if (errorMsg.contains('could not find Deezer equivalent') || 
+          errorMsg.contains('track not found on Deezer')) {
+         errorMsg = 'Track not found on Deezer (Metadata Unavailable)';
+         errorType = DownloadErrorType.notFound;
+      }
+
      updateItemStatus(
        item.id,
        DownloadStatus.failed,
-        error: e.toString(),
+        error: errorMsg,
+        errorType: errorType,
      );
      _failedInSession++;
    }
@@ -5,6 +5,8 @@ import 'package:spotiflac_android/models/settings.dart';
 import 'package:spotiflac_android/services/platform_bridge.dart';

 const _settingsKey = 'app_settings';
+const _migrationVersionKey = 'settings_migration_version';
+const _currentMigrationVersion = 1;

 class SettingsNotifier extends Notifier<AppSettings> {
  @override
@@ -18,11 +20,35 @@ 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();
    }
  }

+  /// 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);
+    }
+  }
+
  Future<void> _saveSettings() async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.setString(_settingsKey, jsonEncode(state.toJson()));
@@ -96,6 +122,11 @@ class SettingsNotifier extends Notifier<AppSettings> {
    _saveSettings();
  }

+  void setUpdateChannel(String channel) {
+    state = state.copyWith(updateChannel: channel);
+    _saveSettings();
+  }
+
  void setHasSearchedBefore() {
    if (!state.hasSearchedBefore) {
      state = state.copyWith(hasSearchedBefore: true);
@@ -151,6 +182,11 @@ class SettingsNotifier extends Notifier<AppSettings> {
    _saveSettings();
    _applySpotifyCredentials();
  }
+
+  void setMetadataSource(String source) {
+    state = state.copyWith(metadataSource: source);
+    _saveSettings();
+  }
 }

 final settingsProvider = NotifierProvider<SettingsNotifier, AppSettings>(
@@ -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;
@@ -114,7 +114,7 @@ class TrackNotifier extends Notifier<TrackState> {
  /// Check if request is still valid (not cancelled by newer request)
  bool _isRequestValid(int requestId) => requestId == _currentRequestId;

-  Future<void> fetchFromUrl(String url) async {
+  Future<void> fetchFromUrl(String url, {bool useDeezerFallback = true}) async {
    // Increment request ID to cancel any pending requests
    final requestId = ++_currentRequestId;

@@ -127,7 +127,22 @@ class TrackNotifier extends Notifier<TrackState> {
      
      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') {
@@ -149,6 +164,8 @@ class TrackNotifier extends Notifier<TrackState> {
          albumName: albumInfo['name'] as String?,
          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>;
@@ -160,6 +177,8 @@ class TrackNotifier extends Notifier<TrackState> {
          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>;
@@ -180,7 +199,7 @@ class TrackNotifier extends Notifier<TrackState> {
    }
  }

-  Future<void> search(String query) async {
+  Future<void> search(String query, {String? metadataSource}) async {
    // Increment request ID to cancel any pending requests
    final requestId = ++_currentRequestId;

@@ -188,7 +207,24 @@ class TrackNotifier extends Notifier<TrackState> {
    state = TrackState(isLoading: true, hasSearchText: state.hasSearchText);

    try {
-      final results = await PlatformBridge.searchSpotifyAll(query, trackLimit: 20, artistLimit: 5);
+      // 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>? ?? [];
@@ -266,7 +302,7 @@ 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?,
@@ -282,7 +318,7 @@ 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?,
@@ -310,6 +346,28 @@ class TrackNotifier extends Notifier<TrackState> {
      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>(
@@ -71,8 +71,22 @@ class _AlbumScreenState extends ConsumerState<AlbumScreen> {
  Future<void> _fetchTracks() async {
    setState(() => _isLoading = true);
    try {
-      final url = 'https://open.spotify.com/album/${widget.albumId}';
-      final metadata = await PlatformBridge.getSpotifyMetadata(url);
+      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();
      
@@ -104,7 +118,7 @@ class _AlbumScreenState extends ConsumerState<AlbumScreen> {
      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?,
@@ -302,8 +316,8 @@ class _AlbumScreenState extends ConsumerState<AlbumScreen> {
  void _downloadTrack(BuildContext context, Track track) {
    final settings = ref.read(settingsProvider);
    if (settings.askQualityBeforeDownload) {
-      _showQualityPicker(context, (quality) {
-        ref.read(downloadQueueProvider.notifier).addToQueue(track, settings.defaultService, qualityOverride: quality);
+      _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 {
@@ -317,8 +331,8 @@ class _AlbumScreenState extends ConsumerState<AlbumScreen> {
    if (tracks == null || tracks.isEmpty) return;
    final settings = ref.read(settingsProvider);
    if (settings.askQualityBeforeDownload) {
-      _showQualityPicker(context, (quality) {
-        ref.read(downloadQueueProvider.notifier).addMultipleToQueue(tracks, settings.defaultService, qualityOverride: quality);
+      _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 {
@@ -327,44 +341,69 @@ class _AlbumScreenState extends ConsumerState<AlbumScreen> {
    }
  }

-  void _showQualityPicker(BuildContext context, void Function(String quality) onSelect, {String? trackName, String? artistName, String? coverUrl}) {
+  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))),
-      builder: (context) => SafeArea(
-        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)))),
-            ],
-            Padding(
-              padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
-              child: Text('Select Quality', style: Theme.of(context).textTheme.titleLarge?.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,
+      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),
+              ],
            ),
-            _QualityOption(title: 'FLAC Lossless', subtitle: '16-bit / 44.1kHz', icon: Icons.music_note, onTap: () { Navigator.pop(context); onSelect('LOSSLESS'); }),
-            _QualityOption(title: 'Hi-Res FLAC', subtitle: '24-bit / up to 96kHz', icon: Icons.high_quality, onTap: () { Navigator.pop(context); onSelect('HI_RES'); }),
-            _QualityOption(title: 'Hi-Res FLAC Max', subtitle: '24-bit / up to 192kHz', icon: Icons.four_k, onTap: () { Navigator.pop(context); onSelect('HI_RES_LOSSLESS'); }),
-            const SizedBox(height: 16),
-          ],
+          ),
        ),
      ),
    );
@@ -455,6 +494,40 @@ class _QualityOption extends StatelessWidget {
  }
 }

+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;
@@ -69,10 +69,25 @@ class _ArtistScreenState extends ConsumerState<ArtistScreen> {
  Future<void> _fetchDiscography() async {
    setState(() => _isLoadingDiscography = true);
    try {
-      final url = 'https://open.spotify.com/artist/${widget.artistId}';
-      final metadata = await PlatformBridge.getSpotifyMetadata(url);
-      final albumsList = metadata['albums'] as List<dynamic>;
-      final albums = albumsList.map((a) => _parseArtistAlbum(a as Map<String, dynamic>)).toList();
+      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);
@@ -290,7 +305,9 @@ class _ArtistScreenState extends ConsumerState<ArtistScreen> {
                      Text(album.name, style: Theme.of(context).textTheme.bodySmall?.copyWith(fontWeight: FontWeight.w600), maxLines: 2, overflow: TextOverflow.ellipsis),
                      const Spacer(),
                      Text(
-                        '${album.releaseDate.length >= 4 ? album.releaseDate.substring(0, 4) : album.releaseDate} • ${album.totalTracks} tracks',
+                        album.totalTracks > 0 
+                            ? '${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,
@@ -38,7 +38,8 @@ class _HomeScreenState extends ConsumerState<HomeScreen> {
    if (url.startsWith('http') || url.startsWith('spotify:')) {
      await ref.read(trackProvider.notifier).fetchFromUrl(url);
    } else {
-      await ref.read(trackProvider.notifier).search(url);
+      final settings = ref.read(settingsProvider);
+      await ref.read(trackProvider.notifier).search(url, metadataSource: settings.metadataSource);
    }
  }

@@ -81,7 +81,8 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
    if (_lastSearchQuery == query) return;
    _lastSearchQuery = query;
    
-    await ref.read(trackProvider.notifier).search(query);
+    final settings = ref.read(settingsProvider);
+    await ref.read(trackProvider.notifier).search(query, metadataSource: settings.metadataSource);
    ref.read(settingsProvider.notifier).setHasSearchedBefore();
  }

@@ -112,7 +113,8 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
      await ref.read(trackProvider.notifier).fetchFromUrl(url);
      _navigateToDetailIfNeeded();
    } else {
-      await ref.read(trackProvider.notifier).search(url);
+      final settings = ref.read(settingsProvider);
+      await ref.read(trackProvider.notifier).search(url, metadataSource: settings.metadataSource);
    }
    ref.read(settingsProvider.notifier).setHasSearchedBefore();
  }
@@ -170,8 +172,8 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
      final settings = ref.read(settingsProvider);
      
      if (settings.askQualityBeforeDownload) {
-        _showQualityPicker(context, (quality) {
-          ref.read(downloadQueueProvider.notifier).addToQueue(track, settings.defaultService, qualityOverride: quality);
+        _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 {
@@ -181,59 +183,84 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
    }
  }

-  void _showQualityPicker(BuildContext context, void Function(String quality) onSelect, {String? trackName, String? artistName, String? coverUrl}) {
+  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))),
-      builder: (context) => SafeArea(
-        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)))),
-            ],
-            Padding(
-              padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
-              child: Text('Select Quality', style: Theme.of(context).textTheme.titleLarge?.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,
+      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,
+                    ),
+                  ),
+                ),
+                _QualityPickerOption(
+                  title: 'FLAC Lossless',
+                  subtitle: '16-bit / 44.1kHz',
+                  icon: Icons.music_note,
+                  onTap: () { Navigator.pop(context); onSelect('LOSSLESS', selectedService); },
+                ),
+                _QualityPickerOption(
+                  title: 'Hi-Res FLAC',
+                  subtitle: '24-bit / up to 96kHz',
+                  icon: Icons.high_quality,
+                  onTap: () { Navigator.pop(context); onSelect('HI_RES', selectedService); },
+                ),
+                _QualityPickerOption(
+                  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),
+              ],
            ),
-            _QualityPickerOption(
-              title: 'FLAC Lossless',
-              subtitle: '16-bit / 44.1kHz',
-              icon: Icons.music_note,
-              onTap: () { Navigator.pop(context); onSelect('LOSSLESS'); },
-            ),
-            _QualityPickerOption(
-              title: 'Hi-Res FLAC',
-              subtitle: '24-bit / up to 96kHz',
-              icon: Icons.high_quality,
-              onTap: () { Navigator.pop(context); onSelect('HI_RES'); },
-            ),
-            _QualityPickerOption(
-              title: 'Hi-Res FLAC Max',
-              subtitle: '24-bit / up to 192kHz',
-              icon: Icons.four_k,
-              onTap: () { Navigator.pop(context); onSelect('HI_RES_LOSSLESS'); },
-            ),
-            const SizedBox(height: 16),
-          ],
+          ),
        ),
      ),
    );
@@ -764,6 +791,40 @@ class _QualityPickerOption extends StatelessWidget {
  }
 }

+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;
@@ -85,7 +85,7 @@ class _MainShellState extends ConsumerState<MainShell> {
    final settings = ref.read(settingsProvider);
    if (!settings.checkForUpdates) return;

-    final updateInfo = await UpdateChecker.checkForUpdate();
+    final updateInfo = await UpdateChecker.checkForUpdate(channel: settings.updateChannel);
    if (updateInfo != null && mounted) {
      showUpdateDialog(
        context,
@@ -168,8 +168,8 @@ class PlaylistScreen extends ConsumerWidget {
  void _downloadTrack(BuildContext context, WidgetRef ref, Track track) {
    final settings = ref.read(settingsProvider);
    if (settings.askQualityBeforeDownload) {
-      _showQualityPicker(context, (quality) {
-        ref.read(downloadQueueProvider.notifier).addToQueue(track, settings.defaultService, qualityOverride: quality);
+      _showQualityPicker(context, ref, (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 {
@@ -182,8 +182,8 @@ class PlaylistScreen extends ConsumerWidget {
    if (tracks.isEmpty) return;
    final settings = ref.read(settingsProvider);
    if (settings.askQualityBeforeDownload) {
-      _showQualityPicker(context, (quality) {
-        ref.read(downloadQueueProvider.notifier).addMultipleToQueue(tracks, settings.defaultService, qualityOverride: quality);
+      _showQualityPicker(context, ref, (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: playlistName);
    } else {
@@ -192,41 +192,66 @@ class PlaylistScreen extends ConsumerWidget {
    }
  }

-  void _showQualityPicker(BuildContext context, void Function(String quality) onSelect, {String? trackName, String? artistName, String? coverUrl}) {
+  void _showQualityPicker(BuildContext context, WidgetRef ref, 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))),
-      builder: (context) => SafeArea(
-        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)))),
-            ],
-            Padding(padding: const EdgeInsets.fromLTRB(24, 16, 24, 8), child: Text('Select Quality', style: Theme.of(context).textTheme.titleLarge?.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,
+      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),
+              ],
            ),
-            _QualityOption(title: 'FLAC Lossless', subtitle: '16-bit / 44.1kHz', icon: Icons.music_note, onTap: () { Navigator.pop(context); onSelect('LOSSLESS'); }),
-            _QualityOption(title: 'Hi-Res FLAC', subtitle: '24-bit / up to 96kHz', icon: Icons.high_quality, onTap: () { Navigator.pop(context); onSelect('HI_RES'); }),
-            _QualityOption(title: 'Hi-Res FLAC Max', subtitle: '24-bit / up to 192kHz', icon: Icons.four_k, onTap: () { Navigator.pop(context); onSelect('HI_RES_LOSSLESS'); }),
-            const SizedBox(height: 16),
-          ],
+          ),
        ),
      ),
    );
@@ -254,6 +279,40 @@ class _QualityOption extends StatelessWidget {
  }
 }

+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;
@@ -331,8 +331,11 @@ class _QueueTabState extends ConsumerState<QueueTab> {
                            ),
                          ),
                          const SizedBox(width: 8),
+                          // Show percentage and speed
                          Text(
-                            '${(item.progress * 100).toStringAsFixed(0)}%',
+                            item.speedMBps > 0 
+                                ? '${(item.progress * 100).toStringAsFixed(0)}% • ${item.speedMBps.toStringAsFixed(1)} MB/s'
+                                : '${(item.progress * 100).toStringAsFixed(0)}%',
                            style: Theme.of(context).textTheme.labelSmall?.copyWith(
                              color: colorScheme.primary,
                              fontWeight: FontWeight.bold,
@@ -344,7 +347,7 @@ class _QueueTabState extends ConsumerState<QueueTab> {
                    if (item.status == DownloadStatus.failed) ...[
                      const SizedBox(height: 4),
                      Text(
-                        item.error ?? 'Download failed',
+                        item.errorMessage, // Use user-friendly error message
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                        style: Theme.of(context).textTheme.labelSmall?.copyWith(
@@ -23,7 +23,8 @@ class _SearchScreenState extends ConsumerState<SearchScreen> {
    _searchController = TextEditingController(text: widget.query);
    if (widget.query.isNotEmpty) {
      WidgetsBinding.instance.addPostFrameCallback((_) {
-        ref.read(trackProvider.notifier).search(widget.query);
+        final settings = ref.read(settingsProvider);
+        ref.read(trackProvider.notifier).search(widget.query, metadataSource: settings.metadataSource);
      });
    }
  }
@@ -37,7 +38,8 @@ class _SearchScreenState extends ConsumerState<SearchScreen> {
  void _search() {
    final query = _searchController.text.trim();
    if (query.isNotEmpty) {
-      ref.read(trackProvider.notifier).search(query);
+      final settings = ref.read(settingsProvider);
+      ref.read(trackProvider.notifier).search(query, metadataSource: settings.metadataSource);
    }
  }

@@ -12,53 +12,46 @@ class AboutPage extends StatelessWidget {
    final colorScheme = Theme.of(context).colorScheme;
    final topPadding = MediaQuery.of(context).padding.top;

-    return Scaffold(
-      body: CustomScrollView(
-        slivers: [
-          // Collapsing App Bar with back button
-          SliverAppBar(
-            expandedHeight: 120 + topPadding,
-            collapsedHeight: kToolbarHeight,
-            floating: false,
-            pinned: true,
-            backgroundColor: colorScheme.surface,
-            surfaceTintColor: Colors.transparent,
-            leading: IconButton(
-              icon: const Icon(Icons.arrow_back),
-              onPressed: () => Navigator.pop(context),
-            ),
-            flexibleSpace: LayoutBuilder(
-              builder: (context, constraints) {
-                final maxHeight = 120 + topPadding;
-                final minHeight = kToolbarHeight + topPadding;
-                final expandRatio = ((constraints.maxHeight - minHeight) / (maxHeight - minHeight)).clamp(0.0, 1.0);
-                final animation = AlwaysStoppedAnimation(expandRatio);
-                return FlexibleSpaceBar(
-                  expandedTitleScale: 1.0,
-                  titlePadding: EdgeInsets.zero,
-                  title: SafeArea(
-                    child: Container(
-                      alignment: Alignment.bottomLeft,
-                      padding: EdgeInsets.only(
-                        // When collapsed (expandRatio=0): left=56 to align with back button
-                        // When expanded (expandRatio=1): left=24 for normal padding
-                        left: Tween<double>(begin: 56, end: 24).evaluate(animation),
-                        bottom: Tween<double>(begin: 16, end: 16).evaluate(animation),
-                      ),
-                      child: Text(
-                        'About',
-                        style: TextStyle(
-                          fontSize: Tween<double>(begin: 20, end: 28).evaluate(animation),
-                          fontWeight: FontWeight.bold,
-                          color: colorScheme.onSurface,
-                        ),
+    return PopScope(
+      canPop: true,
+      child: Scaffold(
+        body: CustomScrollView(
+          slivers: [
+            // Collapsing App Bar with back button
+            SliverAppBar(
+              expandedHeight: 120 + topPadding,
+              collapsedHeight: kToolbarHeight,
+              floating: false,
+              pinned: true,
+              backgroundColor: colorScheme.surface,
+              surfaceTintColor: Colors.transparent,
+              leading: IconButton(
+                icon: const Icon(Icons.arrow_back),
+                onPressed: () => Navigator.pop(context),
+              ),
+              flexibleSpace: LayoutBuilder(
+                builder: (context, constraints) {
+                  final maxHeight = 120 + topPadding;
+                  final minHeight = kToolbarHeight + topPadding;
+                  final expandRatio = ((constraints.maxHeight - minHeight) / (maxHeight - minHeight)).clamp(0.0, 1.0);
+                  // When collapsed (expandRatio=0): left=56 to avoid back button
+                  // When expanded (expandRatio=1): left=24 for normal padding
+                  final leftPadding = 56 - (32 * expandRatio); // 56 -> 24
+                  return FlexibleSpaceBar(
+                    expandedTitleScale: 1.0,
+                    titlePadding: EdgeInsets.only(left: leftPadding, bottom: 16),
+                    title: Text(
+                      'About',
+                      style: TextStyle(
+                        fontSize: 20 + (8 * expandRatio), // 20 -> 28
+                        fontWeight: FontWeight.bold,
+                        color: colorScheme.onSurface,
                      ),
                    ),
-                  ),
-                );
-              },
+                  );
+                },
+              ),
            ),
-          ),

          // App header card with logo and description
          SliverToBoxAdapter(
@@ -85,6 +78,49 @@ class AboutPage extends StatelessWidget {
                  name: AppInfo.originalAuthor,
                  description: 'Creator of the original SpotiFLAC',
                  githubUsername: AppInfo.originalAuthor,
+                  showDivider: true,
+                ),
+                _ContributorItem(
+                  name: 'Amonoman',
+                  description: 'The talented artist who created our beautiful app logo!',
+                  githubUsername: 'Amonoman',
+                  showDivider: false,
+                ),
+              ],
+            ),
+          ),
+
+          // Special Thanks section
+          const SliverToBoxAdapter(
+            child: SettingsSectionHeader(title: 'Special Thanks'),
+          ),
+          SliverToBoxAdapter(
+            child: SettingsGroup(
+              children: [
+                _ContributorItem(
+                  name: 'uimaxbai',
+                  description: 'The creator of QQDL & HiFi API. Without this API, Tidal downloads wouldn\'t exist!',
+                  githubUsername: 'uimaxbai',
+                  showDivider: true,
+                ),
+                _ContributorItem(
+                  name: 'sachinsenal0x64',
+                  description: 'The original HiFi project creator. The foundation of Tidal integration!',
+                  githubUsername: 'sachinsenal0x64',
+                  showDivider: true,
+                ),
+                SettingsItem(
+                  icon: Icons.cloud_outlined,
+                  title: 'DoubleDouble',
+                  subtitle: 'Amazing API for Amazon Music downloads. Thank you for making it free!',
+                  onTap: () => _launchUrl('https://doubledouble.top'),
+                  showDivider: true,
+                ),
+                SettingsItem(
+                  icon: Icons.music_note_outlined,
+                  title: 'DAB Music',
+                  subtitle: 'The best Qobuz streaming API. Hi-Res downloads wouldn\'t be possible without this!',
+                  onTap: () => _launchUrl('https://dabmusic.xyz'),
                  showDivider: false,
                ),
              ],
@@ -130,6 +166,24 @@ class AboutPage extends StatelessWidget {
            ),
          ),

+          // Support section
+          const SliverToBoxAdapter(
+            child: SettingsSectionHeader(title: 'Support'),
+          ),
+          SliverToBoxAdapter(
+            child: SettingsGroup(
+              children: [
+                SettingsItem(
+                  icon: Icons.coffee_outlined,
+                  title: 'Buy me a coffee',
+                  subtitle: 'Support development on Ko-fi',
+                  onTap: () => _launchUrl(AppInfo.kofiUrl),
+                  showDivider: false,
+                ),
+              ],
+            ),
+          ),
+
          // App info section
          const SliverToBoxAdapter(
            child: SettingsSectionHeader(title: 'App'),
@@ -166,6 +220,7 @@ class AboutPage extends StatelessWidget {
          const SliverToBoxAdapter(child: SizedBox(height: 16)),
        ],
      ),
+      ),
    );
  }

@@ -14,104 +14,121 @@ class AppearanceSettingsPage extends ConsumerWidget {
    final colorScheme = Theme.of(context).colorScheme;
    final topPadding = MediaQuery.of(context).padding.top;

-    return Scaffold(
-      body: CustomScrollView(
-        slivers: [
-          // Collapsing App Bar with back button
-          SliverAppBar(
-            expandedHeight: 120 + topPadding,
-            collapsedHeight: kToolbarHeight,
-            floating: false,
-            pinned: true,
-            backgroundColor: colorScheme.surface,
-            surfaceTintColor: Colors.transparent,
-            leading: IconButton(icon: const Icon(Icons.arrow_back), onPressed: () => Navigator.pop(context)),
-            flexibleSpace: LayoutBuilder(
-              builder: (context, constraints) {
-                final maxHeight = 120 + topPadding;
-                final minHeight = kToolbarHeight + topPadding;
-                final expandRatio = ((constraints.maxHeight - minHeight) / (maxHeight - minHeight)).clamp(0.0, 1.0);
-                final animation = AlwaysStoppedAnimation(expandRatio);
-                return FlexibleSpaceBar(
-                  expandedTitleScale: 1.0,
-                  titlePadding: EdgeInsets.zero,
-                  title: SafeArea(
-                    child: Container(
-                      alignment: Alignment.bottomLeft,
-                      padding: EdgeInsets.only(
-                        left: Tween<double>(begin: 56, end: 24).evaluate(animation),
-                        bottom: Tween<double>(begin: 16, end: 16).evaluate(animation),
-                      ),
-                      child: Text('Appearance',
-                        style: TextStyle(
-                          fontSize: Tween<double>(begin: 20, end: 28).evaluate(animation),
-                          fontWeight: FontWeight.bold,
-                          color: colorScheme.onSurface,
-                        ),
-                      ),
+    return PopScope(
+      canPop: true,
+      child: Scaffold(
+        body: CustomScrollView(
+          slivers: [
+            // Collapsing App Bar with back button
+            SliverAppBar(
+              expandedHeight: 120 + topPadding,
+              collapsedHeight: kToolbarHeight,
+              floating: false,
+              pinned: true,
+              backgroundColor: colorScheme.surface,
+              surfaceTintColor: Colors.transparent,
+              leading: IconButton(icon: const Icon(Icons.arrow_back), onPressed: () => Navigator.pop(context)),
+              flexibleSpace: _AppBarTitle(title: 'Appearance', topPadding: topPadding),
+            ),
+
+            // Theme section
+            const SliverToBoxAdapter(child: SettingsSectionHeader(title: 'Theme')),
+            SliverToBoxAdapter(
+              child: SettingsGroup(
+                children: [
+                  _ThemeModeSelector(
+                    currentMode: themeSettings.themeMode,
+                    onChanged: (mode) => ref.read(themeProvider.notifier).setThemeMode(mode),
+                  ),
+                  SettingsSwitchItem(
+                    icon: Icons.brightness_2,
+                    title: 'AMOLED Dark',
+                    subtitle: 'Pure black background for OLED screens',
+                    value: themeSettings.useAmoled,
+                    onChanged: (value) => ref.read(themeProvider.notifier).setUseAmoled(value),
+                    showDivider: false,
+                  ),
+                ],
+              ),
+            ),
+
+            // Color section
+            const SliverToBoxAdapter(child: SettingsSectionHeader(title: 'Color')),
+            SliverToBoxAdapter(
+              child: SettingsGroup(
+                children: [
+                  SettingsSwitchItem(
+                    icon: Icons.auto_awesome,
+                    title: 'Dynamic Color',
+                    subtitle: 'Use colors from your wallpaper',
+                    value: themeSettings.useDynamicColor,
+                    onChanged: (value) => ref.read(themeProvider.notifier).setUseDynamicColor(value),
+                    showDivider: !themeSettings.useDynamicColor,
+                  ),
+                  if (!themeSettings.useDynamicColor)
+                    _ColorPicker(
+                      currentColor: themeSettings.seedColorValue,
+                      onColorSelected: (color) => ref.read(themeProvider.notifier).setSeedColor(color),
                    ),
+                ],
+              ),
+            ),
+
+            // Layout section
+            const SliverToBoxAdapter(child: SettingsSectionHeader(title: 'Layout')),
+            SliverToBoxAdapter(
+              child: SettingsGroup(
+                children: [
+                  _HistoryViewSelector(
+                    currentMode: settings.historyViewMode,
+                    onChanged: (mode) => ref.read(settingsProvider.notifier).setHistoryViewMode(mode),
                  ),
-                );
-              },
+                ],
+              ),
            ),
-          ),

-          // Theme section
-          const SliverToBoxAdapter(child: SettingsSectionHeader(title: 'Theme')),
-          SliverToBoxAdapter(
-            child: SettingsGroup(
-              children: [
-                _ThemeModeSelector(
-                  currentMode: themeSettings.themeMode,
-                  onChanged: (mode) => ref.read(themeProvider.notifier).setThemeMode(mode),
-                ),
-              ],
-            ),
-          ),
-
-          // Color section
-          const SliverToBoxAdapter(child: SettingsSectionHeader(title: 'Color')),
-          SliverToBoxAdapter(
-            child: SettingsGroup(
-              children: [
-                SettingsSwitchItem(
-                  icon: Icons.auto_awesome,
-                  title: 'Dynamic Color',
-                  subtitle: 'Use colors from your wallpaper',
-                  value: themeSettings.useDynamicColor,
-                  onChanged: (value) => ref.read(themeProvider.notifier).setUseDynamicColor(value),
-                  showDivider: !themeSettings.useDynamicColor,
-                ),
-                if (!themeSettings.useDynamicColor)
-                  _ColorPicker(
-                    currentColor: themeSettings.seedColorValue,
-                    onColorSelected: (color) => ref.read(themeProvider.notifier).setSeedColor(color),
-                  ),
-              ],
-            ),
-          ),
-
-          // Layout section
-          const SliverToBoxAdapter(child: SettingsSectionHeader(title: 'Layout')),
-          SliverToBoxAdapter(
-            child: SettingsGroup(
-              children: [
-                _HistoryViewSelector(
-                  currentMode: settings.historyViewMode,
-                  onChanged: (mode) => ref.read(settingsProvider.notifier).setHistoryViewMode(mode),
-                ),
-              ],
-            ),
-          ),
-
-          // Fill remaining for scroll
-          const SliverFillRemaining(hasScrollBody: false, child: SizedBox()),
-        ],
+            // Fill remaining for scroll
+            const SliverFillRemaining(hasScrollBody: false, child: SizedBox()),
+          ],
+        ),
      ),
    );
  }
 }

+/// Optimized app bar title with animation
+class _AppBarTitle extends StatelessWidget {
+  final String title;
+  final double topPadding;
+  
+  const _AppBarTitle({required this.title, required this.topPadding});
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    return LayoutBuilder(
+      builder: (context, constraints) {
+        final maxHeight = 120 + topPadding;
+        final minHeight = kToolbarHeight + topPadding;
+        final expandRatio = ((constraints.maxHeight - minHeight) / (maxHeight - minHeight)).clamp(0.0, 1.0);
+        final leftPadding = 56 - (32 * expandRatio); // 56 -> 24
+        return FlexibleSpaceBar(
+          expandedTitleScale: 1.0,
+          titlePadding: EdgeInsets.only(left: leftPadding, bottom: 16),
+          title: Text(
+            title,
+            style: TextStyle(
+              fontSize: 20 + (8 * expandRatio), // 20 -> 28
+              fontWeight: FontWeight.bold,
+              color: colorScheme.onSurface,
+            ),
+          ),
+        );
+      },
+    );
+  }
+}
+
 class _ThemeModeSelector extends StatelessWidget {
  final ThemeMode currentMode;
  final ValueChanged<ThemeMode> onChanged;
@@ -1,6 +1,8 @@
+import 'dart:io';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:file_picker/file_picker.dart';
+import 'package:path_provider/path_provider.dart';
 import 'package:spotiflac_android/providers/settings_provider.dart';
 import 'package:spotiflac_android/widgets/settings_group.dart';

@@ -13,47 +15,41 @@ class DownloadSettingsPage extends ConsumerWidget {
    final colorScheme = Theme.of(context).colorScheme;
    final topPadding = MediaQuery.of(context).padding.top;

-    return Scaffold(
-      body: CustomScrollView(
-        slivers: [
-          // Collapsing App Bar with back button
-          SliverAppBar(
-            expandedHeight: 120 + topPadding,
-            collapsedHeight: kToolbarHeight,
-            floating: false,
-            pinned: true,
-            backgroundColor: colorScheme.surface,
-            surfaceTintColor: Colors.transparent,
-            leading: IconButton(icon: const Icon(Icons.arrow_back), onPressed: () => Navigator.pop(context)),
-            flexibleSpace: LayoutBuilder(
-              builder: (context, constraints) {
-                final maxHeight = 120 + topPadding;
-                final minHeight = kToolbarHeight + topPadding;
-                final expandRatio = ((constraints.maxHeight - minHeight) / (maxHeight - minHeight)).clamp(0.0, 1.0);
-                final animation = AlwaysStoppedAnimation(expandRatio);
-                return FlexibleSpaceBar(
-                  expandedTitleScale: 1.0,
-                  titlePadding: EdgeInsets.zero,
-                  title: SafeArea(
-                    child: Container(
-                      alignment: Alignment.bottomLeft,
-                      padding: EdgeInsets.only(
-                        left: Tween<double>(begin: 56, end: 24).evaluate(animation),
-                        bottom: Tween<double>(begin: 16, end: 16).evaluate(animation),
-                      ),
-                      child: Text('Download',
-                        style: TextStyle(
-                          fontSize: Tween<double>(begin: 20, end: 28).evaluate(animation),
-                          fontWeight: FontWeight.bold,
-                          color: colorScheme.onSurface,
-                        ),
+    return PopScope(
+      canPop: true,
+      child: Scaffold(
+        body: CustomScrollView(
+          slivers: [
+            // Collapsing App Bar with back button
+            SliverAppBar(
+              expandedHeight: 120 + topPadding,
+              collapsedHeight: kToolbarHeight,
+              floating: false,
+              pinned: true,
+              backgroundColor: colorScheme.surface,
+              surfaceTintColor: Colors.transparent,
+              leading: IconButton(icon: const Icon(Icons.arrow_back), onPressed: () => Navigator.pop(context)),
+              flexibleSpace: LayoutBuilder(
+                builder: (context, constraints) {
+                  final maxHeight = 120 + topPadding;
+                  final minHeight = kToolbarHeight + topPadding;
+                  final expandRatio = ((constraints.maxHeight - minHeight) / (maxHeight - minHeight)).clamp(0.0, 1.0);
+                  final leftPadding = 56 - (32 * expandRatio); // 56 -> 24
+                  return FlexibleSpaceBar(
+                    expandedTitleScale: 1.0,
+                    titlePadding: EdgeInsets.only(left: leftPadding, bottom: 16),
+                    title: Text(
+                      'Download',
+                      style: TextStyle(
+                        fontSize: 20 + (8 * expandRatio), // 20 -> 28
+                        fontWeight: FontWeight.bold,
+                        color: colorScheme.onSurface,
                      ),
                    ),
-                  ),
-                );
-              },
+                  );
+                },
+              ),
            ),
-          ),

          // Service section
          const SliverToBoxAdapter(child: SettingsSectionHeader(title: 'Service')),
@@ -119,8 +115,10 @@ class DownloadSettingsPage extends ConsumerWidget {
                SettingsItem(
                  icon: Icons.folder_outlined,
                  title: 'Download Directory',
-                  subtitle: settings.downloadDirectory.isEmpty ? 'Music/SpotiFLAC' : settings.downloadDirectory,
-                  onTap: () => _pickDirectory(ref),
+                  subtitle: settings.downloadDirectory.isEmpty 
+                      ? (Platform.isIOS ? 'App Documents Folder' : 'Music/SpotiFLAC') 
+                      : settings.downloadDirectory,
+                  onTap: () => _pickDirectory(context, ref),
                ),
                SettingsItem(
                  icon: Icons.create_new_folder_outlined,
@@ -136,6 +134,7 @@ class DownloadSettingsPage extends ConsumerWidget {
          const SliverToBoxAdapter(child: SizedBox(height: 32)),
        ],
      ),
+      ),
    );
  }

@@ -166,9 +165,90 @@ class DownloadSettingsPage extends ConsumerWidget {
    );
  }

-  Future<void> _pickDirectory(WidgetRef ref) async {
-    final result = await FilePicker.platform.getDirectoryPath();
-    if (result != null) ref.read(settingsProvider.notifier).setDownloadDirectory(result);
+  Future<void> _pickDirectory(BuildContext context, WidgetRef ref) async {
+    if (Platform.isIOS) {
+      // iOS: Show options dialog
+      _showIOSDirectoryOptions(context, ref);
+    } else {
+      // Android: Use file picker
+      final result = await FilePicker.platform.getDirectoryPath();
+      if (result != null) ref.read(settingsProvider.notifier).setDownloadDirectory(result);
+    }
+  }
+
+  void _showIOSDirectoryOptions(BuildContext context, WidgetRef ref) {
+    final colorScheme = Theme.of(context).colorScheme;
+    showModalBottomSheet(
+      context: context,
+      backgroundColor: colorScheme.surfaceContainerHigh,
+      shape: const RoundedRectangleBorder(borderRadius: BorderRadius.vertical(top: Radius.circular(28))),
+      builder: (ctx) => SafeArea(
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Padding(
+              padding: const EdgeInsets.fromLTRB(24, 24, 24, 8),
+              child: Text('Download Location', style: Theme.of(context).textTheme.titleLarge?.copyWith(fontWeight: FontWeight.bold)),
+            ),
+            Padding(
+              padding: const EdgeInsets.fromLTRB(24, 0, 24, 16),
+              child: Text(
+                'On iOS, downloads are saved to the app\'s Documents folder which is accessible via the Files app.',
+                style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: colorScheme.onSurfaceVariant),
+              ),
+            ),
+            ListTile(
+              leading: Icon(Icons.folder_special, color: colorScheme.primary),
+              title: const Text('App Documents Folder'),
+              subtitle: const Text('Recommended - accessible via Files app'),
+              trailing: Icon(Icons.check_circle, color: colorScheme.primary),
+              onTap: () async {
+                final dir = await getApplicationDocumentsDirectory();
+                ref.read(settingsProvider.notifier).setDownloadDirectory(dir.path);
+                if (ctx.mounted) Navigator.pop(ctx);
+              },
+            ),
+            ListTile(
+              leading: Icon(Icons.cloud, color: colorScheme.onSurfaceVariant),
+              title: const Text('Choose from Files'),
+              subtitle: const Text('Select iCloud or other location'),
+              onTap: () async {
+                Navigator.pop(ctx);
+                // Note: iOS requires folder to have at least one file to be selectable
+                final result = await FilePicker.platform.getDirectoryPath();
+                if (result != null) {
+                  ref.read(settingsProvider.notifier).setDownloadDirectory(result);
+                }
+              },
+            ),
+            Padding(
+              padding: const EdgeInsets.fromLTRB(24, 8, 24, 16),
+              child: Container(
+                padding: const EdgeInsets.all(12),
+                decoration: BoxDecoration(
+                  color: colorScheme.tertiaryContainer.withValues(alpha: 0.3),
+                  borderRadius: BorderRadius.circular(12),
+                ),
+                child: Row(
+                  children: [
+                    Icon(Icons.info_outline, size: 20, color: colorScheme.tertiary),
+                    const SizedBox(width: 12),
+                    Expanded(
+                      child: Text(
+                        'iOS limitation: Empty folders cannot be selected. Create a file inside first or use App Documents.',
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(color: colorScheme.onTertiaryContainer),
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+            ),
+            const SizedBox(height: 8),
+          ],
+        ),
+      ),
+    );
  }

  String _getFolderOrganizationLabel(String value) {
@@ -14,47 +14,41 @@ class OptionsSettingsPage extends ConsumerWidget {
    final colorScheme = Theme.of(context).colorScheme;
    final topPadding = MediaQuery.of(context).padding.top;

-    return Scaffold(
-      body: CustomScrollView(
-        slivers: [
-          // Collapsing App Bar with back button
-          SliverAppBar(
-            expandedHeight: 120 + topPadding,
-            collapsedHeight: kToolbarHeight,
-            floating: false,
-            pinned: true,
-            backgroundColor: colorScheme.surface,
-            surfaceTintColor: Colors.transparent,
-            leading: IconButton(icon: const Icon(Icons.arrow_back), onPressed: () => Navigator.pop(context)),
-            flexibleSpace: LayoutBuilder(
-              builder: (context, constraints) {
-                final maxHeight = 120 + topPadding;
-                final minHeight = kToolbarHeight + topPadding;
-                final expandRatio = ((constraints.maxHeight - minHeight) / (maxHeight - minHeight)).clamp(0.0, 1.0);
-                final animation = AlwaysStoppedAnimation(expandRatio);
-                return FlexibleSpaceBar(
-                  expandedTitleScale: 1.0,
-                  titlePadding: EdgeInsets.zero,
-                  title: SafeArea(
-                    child: Container(
-                      alignment: Alignment.bottomLeft,
-                      padding: EdgeInsets.only(
-                        left: Tween<double>(begin: 56, end: 24).evaluate(animation),
-                        bottom: Tween<double>(begin: 16, end: 16).evaluate(animation),
-                      ),
-                      child: Text('Options',
-                        style: TextStyle(
-                          fontSize: Tween<double>(begin: 20, end: 28).evaluate(animation),
-                          fontWeight: FontWeight.bold,
-                          color: colorScheme.onSurface,
-                        ),
+    return PopScope(
+      canPop: true,
+      child: Scaffold(
+        body: CustomScrollView(
+          slivers: [
+            // Collapsing App Bar with back button
+            SliverAppBar(
+              expandedHeight: 120 + topPadding,
+              collapsedHeight: kToolbarHeight,
+              floating: false,
+              pinned: true,
+              backgroundColor: colorScheme.surface,
+              surfaceTintColor: Colors.transparent,
+              leading: IconButton(icon: const Icon(Icons.arrow_back), onPressed: () => Navigator.pop(context)),
+              flexibleSpace: LayoutBuilder(
+                builder: (context, constraints) {
+                  final maxHeight = 120 + topPadding;
+                  final minHeight = kToolbarHeight + topPadding;
+                  final expandRatio = ((constraints.maxHeight - minHeight) / (maxHeight - minHeight)).clamp(0.0, 1.0);
+                  final leftPadding = 56 - (32 * expandRatio); // 56 -> 24
+                  return FlexibleSpaceBar(
+                    expandedTitleScale: 1.0,
+                    titlePadding: EdgeInsets.only(left: leftPadding, bottom: 16),
+                    title: Text(
+                      'Options',
+                      style: TextStyle(
+                        fontSize: 20 + (8 * expandRatio), // 20 -> 28
+                        fontWeight: FontWeight.bold,
+                        color: colorScheme.onSurface,
                      ),
                    ),
-                  ),
-                );
-              },
+                  );
+                },
+              ),
            ),
-          ),

          // Download options section
          const SliverToBoxAdapter(child: SettingsSectionHeader(title: 'Download')),
@@ -111,7 +105,10 @@ class OptionsSettingsPage extends ConsumerWidget {
                  subtitle: 'Notify when new version is available',
                  value: settings.checkForUpdates,
                  onChanged: (v) => ref.read(settingsProvider.notifier).setCheckForUpdates(v),
-                  showDivider: false,
+                ),
+                _UpdateChannelSelector(
+                  currentChannel: settings.updateChannel,
+                  onChanged: (v) => ref.read(settingsProvider.notifier).setUpdateChannel(v),
                ),
              ],
            ),
@@ -122,29 +119,35 @@ class OptionsSettingsPage extends ConsumerWidget {
          SliverToBoxAdapter(
            child: SettingsGroup(
              children: [
-                SettingsItem(
-                  icon: Icons.key,
-                  title: 'Custom Credentials',
-                  subtitle: settings.spotifyClientId.isNotEmpty 
-                      ? 'Client ID: ${settings.spotifyClientId.length > 8 ? '${settings.spotifyClientId.substring(0, 8)}...' : settings.spotifyClientId}' 
-                      : 'Not configured',
-                  onTap: () => _showSpotifyCredentialsDialog(context, ref, settings),
-                  trailing: settings.spotifyClientId.isNotEmpty
-                      ? Icon(Icons.edit, color: Theme.of(context).colorScheme.onSurfaceVariant, size: 20)
-                      : Icon(Icons.add, color: Theme.of(context).colorScheme.primary, size: 20),
-                  showDivider: settings.spotifyClientId.isNotEmpty,
+                _MetadataSourceSelector(
+                  currentSource: settings.metadataSource,
+                  onChanged: (v) => ref.read(settingsProvider.notifier).setMetadataSource(v),
                ),
-                if (settings.spotifyClientId.isNotEmpty)
-                  SettingsSwitchItem(
-                    icon: Icons.toggle_on,
-                    title: 'Use Custom Credentials',
-                    subtitle: settings.useCustomSpotifyCredentials 
-                        ? 'Using your credentials' 
-                        : 'Using default credentials',
-                    value: settings.useCustomSpotifyCredentials,
-                    onChanged: (v) => ref.read(settingsProvider.notifier).setUseCustomSpotifyCredentials(v),
-                    showDivider: false,
+                if (settings.metadataSource == 'spotify') ...[
+                  SettingsItem(
+                    icon: Icons.key,
+                    title: 'Custom Credentials',
+                    subtitle: settings.spotifyClientId.isNotEmpty 
+                        ? 'Client ID: ${settings.spotifyClientId.length > 8 ? '${settings.spotifyClientId.substring(0, 8)}...' : settings.spotifyClientId}' 
+                        : 'Not configured',
+                    onTap: () => _showSpotifyCredentialsDialog(context, ref, settings),
+                    trailing: settings.spotifyClientId.isNotEmpty
+                        ? Icon(Icons.edit, color: Theme.of(context).colorScheme.onSurfaceVariant, size: 20)
+                        : Icon(Icons.add, color: Theme.of(context).colorScheme.primary, size: 20),
+                    showDivider: settings.spotifyClientId.isNotEmpty,
                  ),
+                  if (settings.spotifyClientId.isNotEmpty)
+                    SettingsSwitchItem(
+                      icon: Icons.toggle_on,
+                      title: 'Use Custom Credentials',
+                      subtitle: settings.useCustomSpotifyCredentials 
+                          ? 'Using your credentials' 
+                          : 'Using default credentials',
+                      value: settings.useCustomSpotifyCredentials,
+                      onChanged: (v) => ref.read(settingsProvider.notifier).setUseCustomSpotifyCredentials(v),
+                      showDivider: false,
+                    ),
+                ],
              ],
            ),
          ),
@@ -168,6 +171,7 @@ class OptionsSettingsPage extends ConsumerWidget {
          const SliverToBoxAdapter(child: SizedBox(height: 32)),
        ],
      ),
+      ),
    );
  }

@@ -398,3 +402,149 @@ class _ConcurrentChip extends StatelessWidget {
    );
  }
 }
+
+class _UpdateChannelSelector extends StatelessWidget {
+  final String currentChannel;
+  final ValueChanged<String> onChanged;
+  const _UpdateChannelSelector({required this.currentChannel, required this.onChanged});
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    return Padding(
+      padding: const EdgeInsets.all(20),
+      child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
+        Row(children: [
+          Icon(Icons.new_releases, color: colorScheme.onSurfaceVariant, size: 24),
+          const SizedBox(width: 16),
+          Expanded(child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
+            Text('Update Channel', style: Theme.of(context).textTheme.bodyLarge),
+            const SizedBox(height: 2),
+            Text(currentChannel == 'preview' ? 'Get preview releases' : 'Stable releases only',
+              style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: colorScheme.onSurfaceVariant)),
+          ])),
+        ]),
+        const SizedBox(height: 16),
+        Row(children: [
+          _ChannelChip(label: 'Stable', isSelected: currentChannel == 'stable', onTap: () => onChanged('stable')),
+          const SizedBox(width: 8),
+          _ChannelChip(label: 'Preview', isSelected: currentChannel == 'preview', onTap: () => onChanged('preview')),
+        ]),
+        const SizedBox(height: 12),
+        Row(children: [
+          Icon(Icons.info_outline, size: 16, color: colorScheme.onSurfaceVariant),
+          const SizedBox(width: 8),
+          Expanded(child: Text('Preview may contain bugs or incomplete features',
+            style: Theme.of(context).textTheme.bodySmall?.copyWith(color: colorScheme.onSurfaceVariant))),
+        ]),
+      ]),
+    );
+  }
+}
+
+class _ChannelChip extends StatelessWidget {
+  final String label;
+  final bool isSelected;
+  final VoidCallback onTap;
+  const _ChannelChip({required this.label, required this.isSelected, required this.onTap});
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final isDark = Theme.of(context).brightness == Brightness.dark;
+    
+    final unselectedColor = isDark 
+        ? Color.alphaBlend(Colors.white.withValues(alpha: 0.05), colorScheme.surface)
+        : colorScheme.surfaceContainerHigh;
+    
+    return Expanded(
+      child: Material(
+        color: isSelected ? colorScheme.primaryContainer : unselectedColor,
+        borderRadius: BorderRadius.circular(12),
+        child: InkWell(
+          onTap: onTap,
+          borderRadius: BorderRadius.circular(12),
+          child: Padding(
+            padding: const EdgeInsets.symmetric(vertical: 12),
+            child: Center(child: Text(label, style: TextStyle(
+              fontWeight: isSelected ? FontWeight.w600 : FontWeight.normal,
+              color: isSelected ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant))),
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+class _MetadataSourceSelector extends StatelessWidget {
+  final String currentSource;
+  final ValueChanged<String> onChanged;
+  const _MetadataSourceSelector({required this.currentSource, required this.onChanged});
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    return Padding(
+      padding: const EdgeInsets.all(20),
+      child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
+        Row(children: [
+          Icon(Icons.search, color: colorScheme.onSurfaceVariant, size: 24),
+          const SizedBox(width: 16),
+          Expanded(child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
+            Text('Search Source', style: Theme.of(context).textTheme.bodyLarge),
+            const SizedBox(height: 2),
+            Text(currentSource == 'deezer' ? 'Deezer (no need developer account)' : 'Spotify (may hit rate limit)',
+              style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: colorScheme.onSurfaceVariant)),
+          ])),
+        ]),
+        const SizedBox(height: 16),
+        Row(children: [
+          _SourceChip(label: 'Deezer', isSelected: currentSource == 'deezer', onTap: () => onChanged('deezer')),
+          const SizedBox(width: 8),
+          _SourceChip(label: 'Spotify', isSelected: currentSource == 'spotify', onTap: () => onChanged('spotify')),
+        ]),
+        const SizedBox(height: 12),
+        Row(children: [
+          Icon(Icons.info_outline, size: 16, color: colorScheme.onSurfaceVariant),
+          const SizedBox(width: 8),
+          Expanded(child: Text('Spotify URLs are always supported regardless of this setting',
+            style: Theme.of(context).textTheme.bodySmall?.copyWith(color: colorScheme.onSurfaceVariant))),
+        ]),
+      ]),
+    );
+  }
+}
+
+class _SourceChip extends StatelessWidget {
+  final String label;
+  final bool isSelected;
+  final VoidCallback onTap;
+  const _SourceChip({required this.label, required this.isSelected, required this.onTap});
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final isDark = Theme.of(context).brightness == Brightness.dark;
+    
+    final unselectedColor = isDark 
+        ? Color.alphaBlend(Colors.white.withValues(alpha: 0.05), colorScheme.surface)
+        : colorScheme.surfaceContainerHigh;
+    
+    return Expanded(
+      child: Material(
+        color: isSelected ? colorScheme.primaryContainer : unselectedColor,
+        borderRadius: BorderRadius.circular(12),
+        child: InkWell(
+          onTap: onTap,
+          borderRadius: BorderRadius.circular(12),
+          child: Padding(
+            padding: const EdgeInsets.symmetric(vertical: 12),
+            child: Center(child: Text(label, style: TextStyle(
+              fontWeight: isSelected ? FontWeight.w600 : FontWeight.normal,
+              color: isSelected ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant))),
+          ),
+        ),
+      ),
+    );
+  }
+}
@@ -23,9 +23,15 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
  String? _selectedDirectory;
  bool _isLoading = false;
  int _androidSdkVersion = 0;
+  
+  // Spotify API credentials
+  final _clientIdController = TextEditingController();
+  final _clientSecretController = TextEditingController();
+  bool _useSpotifyApi = false;
+  bool _showClientSecret = false;

-  // Total steps: Storage -> Notification (Android 13+) -> Folder
-  int get _totalSteps => _androidSdkVersion >= 33 ? 3 : 2;
+  // Total steps: Storage -> Notification (Android 13+) -> Folder -> Spotify API
+  int get _totalSteps => _androidSdkVersion >= 33 ? 4 : 3;

  @override
  void initState() {
@@ -33,6 +39,13 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
    _initDeviceInfo();
  }

+  @override
+  void dispose() {
+    _clientIdController.dispose();
+    _clientSecretController.dispose();
+    super.dispose();
+  }
+
  Future<void> _initDeviceInfo() async {
    if (Platform.isAndroid) {
      final deviceInfo = DeviceInfoPlugin();
@@ -87,10 +100,43 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
        PermissionStatus status;
        
        if (_androidSdkVersion >= 33) {
+          // Android 13+: Use audio permission
          status = await Permission.audio.request();
        } else if (_androidSdkVersion >= 30) {
-          status = await Permission.manageExternalStorage.request();
+          // Android 11-12: Need MANAGE_EXTERNAL_STORAGE
+          // This opens system settings, not a dialog
+          status = await Permission.manageExternalStorage.status;
+          if (!status.isGranted) {
+            // Show explanation dialog first
+            if (mounted) {
+              final shouldOpen = await showDialog<bool>(
+                context: context,
+                builder: (context) => AlertDialog(
+                  title: const Text('Storage Access Required'),
+                  content: const Text(
+                    'Android 11+ requires "All files access" permission to save music files.\n\n'
+                    'Please enable "Allow access to manage all files" in the next screen.',
+                  ),
+                  actions: [
+                    TextButton(
+                      onPressed: () => Navigator.pop(context, false),
+                      child: const Text('Cancel'),
+                    ),
+                    FilledButton(
+                      onPressed: () => Navigator.pop(context, true),
+                      child: const Text('Open Settings'),
+                    ),
+                  ],
+                ),
+              );
+              
+              if (shouldOpen == true) {
+                status = await Permission.manageExternalStorage.request();
+              }
+            }
+          }
        } else {
+          // Android 10 and below: Use legacy storage permission
          status = await Permission.storage.request();
        }
        
@@ -172,29 +218,35 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
    setState(() => _isLoading = true);

    try {
-      String? selectedDirectory = await FilePicker.platform.getDirectoryPath(
-        dialogTitle: 'Select Download Folder',
-      );
-
-      if (selectedDirectory != null) {
-        setState(() => _selectedDirectory = selectedDirectory);
+      if (Platform.isIOS) {
+        // iOS: Show options dialog
+        await _showIOSDirectoryOptions();
      } else {
-        final defaultDir = await _getDefaultDirectory();
-        if (mounted) {
-          final useDefault = await showDialog<bool>(
-            context: context,
-            builder: (context) => AlertDialog(
-              title: const Text('Use Default Folder?'),
-              content: Text('No folder selected. Would you like to use the default Music folder?\n\n$defaultDir'),
-              actions: [
-                TextButton(onPressed: () => Navigator.pop(context, false), child: const Text('Cancel')),
-                TextButton(onPressed: () => Navigator.pop(context, true), child: const Text('Use Default')),
-              ],
-            ),
-          );
+        // Android: Use file picker
+        String? selectedDirectory = await FilePicker.platform.getDirectoryPath(
+          dialogTitle: 'Select Download Folder',
+        );

-          if (useDefault == true) {
-            setState(() => _selectedDirectory = defaultDir);
+        if (selectedDirectory != null) {
+          setState(() => _selectedDirectory = selectedDirectory);
+        } else {
+          final defaultDir = await _getDefaultDirectory();
+          if (mounted) {
+            final useDefault = await showDialog<bool>(
+              context: context,
+              builder: (context) => AlertDialog(
+                title: const Text('Use Default Folder?'),
+                content: Text('No folder selected. Would you like to use the default Music folder?\n\n$defaultDir'),
+                actions: [
+                  TextButton(onPressed: () => Navigator.pop(context, false), child: const Text('Cancel')),
+                  TextButton(onPressed: () => Navigator.pop(context, true), child: const Text('Use Default')),
+                ],
+              ),
+            );
+
+            if (useDefault == true) {
+              setState(() => _selectedDirectory = defaultDir);
+            }
          }
        }
      }
@@ -203,6 +255,82 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
    }
  }

+  Future<void> _showIOSDirectoryOptions() async {
+    final colorScheme = Theme.of(context).colorScheme;
+    
+    await showModalBottomSheet(
+      context: context,
+      backgroundColor: colorScheme.surfaceContainerHigh,
+      shape: const RoundedRectangleBorder(borderRadius: BorderRadius.vertical(top: Radius.circular(28))),
+      builder: (ctx) => SafeArea(
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Padding(
+              padding: const EdgeInsets.fromLTRB(24, 24, 24, 8),
+              child: Text('Download Location', style: Theme.of(context).textTheme.titleLarge?.copyWith(fontWeight: FontWeight.bold)),
+            ),
+            Padding(
+              padding: const EdgeInsets.fromLTRB(24, 0, 24, 16),
+              child: Text(
+                'On iOS, downloads are saved to the app\'s Documents folder which is accessible via the Files app.',
+                style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: colorScheme.onSurfaceVariant),
+              ),
+            ),
+            ListTile(
+              leading: Icon(Icons.folder_special, color: colorScheme.primary),
+              title: const Text('App Documents Folder'),
+              subtitle: const Text('Recommended - accessible via Files app'),
+              trailing: Icon(Icons.check_circle, color: colorScheme.primary),
+              onTap: () async {
+                final dir = await _getDefaultDirectory();
+                setState(() => _selectedDirectory = dir);
+                if (ctx.mounted) Navigator.pop(ctx);
+              },
+            ),
+            ListTile(
+              leading: Icon(Icons.cloud, color: colorScheme.onSurfaceVariant),
+              title: const Text('Choose from Files'),
+              subtitle: const Text('Select iCloud or other location'),
+              onTap: () async {
+                Navigator.pop(ctx);
+                // Note: iOS requires folder to have at least one file to be selectable
+                final result = await FilePicker.platform.getDirectoryPath();
+                if (result != null) {
+                  setState(() => _selectedDirectory = result);
+                }
+              },
+            ),
+            Padding(
+              padding: const EdgeInsets.fromLTRB(24, 8, 24, 16),
+              child: Container(
+                padding: const EdgeInsets.all(12),
+                decoration: BoxDecoration(
+                  color: colorScheme.tertiaryContainer.withValues(alpha: 0.3),
+                  borderRadius: BorderRadius.circular(12),
+                ),
+                child: Row(
+                  children: [
+                    Icon(Icons.info_outline, size: 20, color: colorScheme.tertiary),
+                    const SizedBox(width: 12),
+                    Expanded(
+                      child: Text(
+                        'iOS limitation: Empty folders cannot be selected. Create a file inside first or use App Documents.',
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(color: colorScheme.onTertiaryContainer),
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+            ),
+            const SizedBox(height: 8),
+          ],
+        ),
+      ),
+    );
+  }
+
  Future<String> _getDefaultDirectory() async {
    if (Platform.isIOS) {
      final appDir = await getApplicationDocumentsDirectory();
@@ -243,6 +371,23 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
      }

      ref.read(settingsProvider.notifier).setDownloadDirectory(_selectedDirectory!);
+      
+      // Save Spotify credentials if provided
+      if (_useSpotifyApi && 
+          _clientIdController.text.trim().isNotEmpty && 
+          _clientSecretController.text.trim().isNotEmpty) {
+        ref.read(settingsProvider.notifier).setSpotifyCredentials(
+          _clientIdController.text.trim(),
+          _clientSecretController.text.trim(),
+        );
+        ref.read(settingsProvider.notifier).setUseCustomSpotifyCredentials(true);
+        // Set search source to Spotify when using custom credentials
+        ref.read(settingsProvider.notifier).setMetadataSource('spotify');
+      } else {
+        // Use Deezer as default search source
+        ref.read(settingsProvider.notifier).setMetadataSource('deezer');
+      }
+      
      ref.read(settingsProvider.notifier).setFirstLaunchComplete();

      if (mounted) {
@@ -321,8 +466,8 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {

  Widget _buildStepIndicator(ColorScheme colorScheme) {
    final steps = _androidSdkVersion >= 33
-        ? ['Storage', 'Notification', 'Folder']
-        : ['Permission', 'Folder'];
+        ? ['Storage', 'Notification', 'Folder', 'Spotify']
+        : ['Permission', 'Folder', 'Spotify'];
    
    return Row(
      mainAxisAlignment: MainAxisAlignment.center,
@@ -346,48 +491,61 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
  Widget _buildStepDot(int step, String label, ColorScheme colorScheme) {
    final isActive = _currentStep >= step;
    final isCompleted = _isStepCompleted(step);
+    final isCurrent = _currentStep == step;

    return Column(
      children: [
-        Container(
-          width: 32,
-          height: 32,
+        AnimatedContainer(
+          duration: const Duration(milliseconds: 200),
+          width: 36,
+          height: 36,
          decoration: BoxDecoration(
            shape: BoxShape.circle,
            color: isCompleted
                ? colorScheme.primary
-                : isActive ? colorScheme.primaryContainer : colorScheme.surfaceContainerHighest,
+                : isCurrent 
+                    ? colorScheme.primaryContainer 
+                    : colorScheme.surfaceContainerHighest,
+            border: isCurrent && !isCompleted
+                ? Border.all(color: colorScheme.primary, width: 2)
+                : null,
          ),
          child: Center(
            child: isCompleted
-                ? Icon(Icons.check, size: 18, color: colorScheme.onPrimary)
+                ? Icon(Icons.check_rounded, size: 20, color: colorScheme.onPrimary)
                : Text('${step + 1}',
                    style: TextStyle(
-                      color: isActive ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant,
-                      fontWeight: FontWeight.bold)),
+                      color: isCurrent ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant,
+                      fontWeight: FontWeight.w600,
+                      fontSize: 14,
+                    )),
          ),
        ),
-        const SizedBox(height: 4),
+        const SizedBox(height: 6),
        Text(label,
          style: Theme.of(context).textTheme.labelSmall?.copyWith(
-            color: isActive ? colorScheme.onSurface : colorScheme.onSurfaceVariant)),
+            color: isActive ? colorScheme.onSurface : colorScheme.onSurfaceVariant,
+            fontWeight: isCurrent ? FontWeight.w600 : FontWeight.normal,
+          )),
      ],
    );
  }

  bool _isStepCompleted(int step) {
    if (_androidSdkVersion >= 33) {
-      // 3 steps: Storage, Notification, Folder
+      // 4 steps: Storage, Notification, Folder, Spotify
      switch (step) {
        case 0: return _storagePermissionGranted;
        case 1: return _notificationPermissionGranted;
        case 2: return _selectedDirectory != null;
+        case 3: return false; // Spotify step never shows checkmark (optional)
      }
    } else {
-      // 2 steps: Permission, Folder
+      // 3 steps: Permission, Folder, Spotify
      switch (step) {
        case 0: return _storagePermissionGranted;
        case 1: return _selectedDirectory != null;
+        case 2: return false; // Spotify step never shows checkmark (optional)
      }
    }
    return false;
@@ -399,11 +557,13 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
        case 0: return _buildStoragePermissionStep(colorScheme);
        case 1: return _buildNotificationPermissionStep(colorScheme);
        case 2: return _buildDirectoryStep(colorScheme);
+        case 3: return _buildSpotifyApiStep(colorScheme);
      }
    } else {
      switch (_currentStep) {
        case 0: return _buildStoragePermissionStep(colorScheme);
        case 1: return _buildDirectoryStep(colorScheme);
+        case 2: return _buildSpotifyApiStep(colorScheme);
      }
    }
    return const SizedBox();
@@ -414,35 +574,50 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
      mainAxisAlignment: MainAxisAlignment.center,
      mainAxisSize: MainAxisSize.min,
      children: [
-        Icon(
-          _storagePermissionGranted ? Icons.check_circle : Icons.folder_open,
-          size: 56,
-          color: _storagePermissionGranted ? colorScheme.primary : colorScheme.onSurfaceVariant,
+        // Icon with container background (M3 style)
+        Container(
+          width: 80,
+          height: 80,
+          decoration: BoxDecoration(
+            color: _storagePermissionGranted ? colorScheme.primaryContainer : colorScheme.surfaceContainerHighest,
+            borderRadius: BorderRadius.circular(24),
+          ),
+          child: Icon(
+            _storagePermissionGranted ? Icons.check_rounded : Icons.folder_open_rounded,
+            size: 40,
+            color: _storagePermissionGranted ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant,
+          ),
        ),
-        const SizedBox(height: 16),
+        const SizedBox(height: 20),
        Text(
          _storagePermissionGranted ? 'Storage Permission Granted!' : 'Storage Permission Required',
-          style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold),
+          style: Theme.of(context).textTheme.titleLarge?.copyWith(fontWeight: FontWeight.bold),
          textAlign: TextAlign.center,
        ),
        const SizedBox(height: 8),
-        Text(
-          _storagePermissionGranted
-              ? 'You can now proceed to the next step.'
-              : 'SpotiFLAC needs storage access to save downloaded music files to your device.',
-          style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: colorScheme.onSurfaceVariant),
-          textAlign: TextAlign.center,
+        Padding(
+          padding: const EdgeInsets.symmetric(horizontal: 16),
+          child: Text(
+            _storagePermissionGranted
+                ? 'You can now proceed to the next step.'
+                : 'SpotiFLAC needs storage access to save downloaded music files to your device.',
+            style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: colorScheme.onSurfaceVariant),
+            textAlign: TextAlign.center,
+          ),
        ),
-        const SizedBox(height: 20),
+        const SizedBox(height: 24),
        if (!_storagePermissionGranted)
          FilledButton.icon(
            onPressed: _isLoading ? null : _requestStoragePermission,
            icon: _isLoading
                ? SizedBox(width: 20, height: 20,
                    child: CircularProgressIndicator(strokeWidth: 2, color: colorScheme.onPrimary))
-                : const Icon(Icons.security),
+                : const Icon(Icons.security_rounded),
            label: const Text('Grant Permission'),
-            style: FilledButton.styleFrom(padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 12)),
+            style: FilledButton.styleFrom(
+              padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 14),
+              shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
+            ),
          ),
      ],
    );
@@ -453,39 +628,57 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
      mainAxisAlignment: MainAxisAlignment.center,
      mainAxisSize: MainAxisSize.min,
      children: [
-        Icon(
-          _notificationPermissionGranted ? Icons.check_circle : Icons.notifications_outlined,
-          size: 56,
-          color: _notificationPermissionGranted ? colorScheme.primary : colorScheme.onSurfaceVariant,
+        // Icon with container background (M3 style)
+        Container(
+          width: 80,
+          height: 80,
+          decoration: BoxDecoration(
+            color: _notificationPermissionGranted ? colorScheme.primaryContainer : colorScheme.surfaceContainerHighest,
+            borderRadius: BorderRadius.circular(24),
+          ),
+          child: Icon(
+            _notificationPermissionGranted ? Icons.check_rounded : Icons.notifications_outlined,
+            size: 40,
+            color: _notificationPermissionGranted ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant,
+          ),
        ),
-        const SizedBox(height: 16),
+        const SizedBox(height: 20),
        Text(
          _notificationPermissionGranted ? 'Notification Permission Granted!' : 'Enable Notifications',
-          style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold),
+          style: Theme.of(context).textTheme.titleLarge?.copyWith(fontWeight: FontWeight.bold),
          textAlign: TextAlign.center,
        ),
        const SizedBox(height: 8),
-        Text(
-          _notificationPermissionGranted
-              ? 'You will receive download progress notifications.'
-              : 'Get notified about download progress and completion. This helps you track downloads when the app is in background.',
-          style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: colorScheme.onSurfaceVariant),
-          textAlign: TextAlign.center,
+        Padding(
+          padding: const EdgeInsets.symmetric(horizontal: 16),
+          child: Text(
+            _notificationPermissionGranted
+                ? 'You will receive download progress notifications.'
+                : 'Get notified about download progress and completion. This helps you track downloads when the app is in background.',
+            style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: colorScheme.onSurfaceVariant),
+            textAlign: TextAlign.center,
+          ),
        ),
-        const SizedBox(height: 20),
+        const SizedBox(height: 24),
        if (!_notificationPermissionGranted) ...[
          FilledButton.icon(
            onPressed: _isLoading ? null : _requestNotificationPermission,
            icon: _isLoading
                ? SizedBox(width: 20, height: 20,
                    child: CircularProgressIndicator(strokeWidth: 2, color: colorScheme.onPrimary))
-                : const Icon(Icons.notifications_active),
+                : const Icon(Icons.notifications_active_rounded),
            label: const Text('Enable Notifications'),
-            style: FilledButton.styleFrom(padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 12)),
+            style: FilledButton.styleFrom(
+              padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 14),
+              shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
+            ),
          ),
          const SizedBox(height: 12),
          TextButton(
            onPressed: _skipNotificationPermission,
+            style: TextButton.styleFrom(
+              padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 12),
+            ),
            child: const Text('Skip for now'),
          ),
        ],
@@ -498,51 +691,226 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
      mainAxisAlignment: MainAxisAlignment.center,
      mainAxisSize: MainAxisSize.min,
      children: [
-        Icon(
-          _selectedDirectory != null ? Icons.folder : Icons.create_new_folder,
-          size: 56,
-          color: _selectedDirectory != null ? colorScheme.primary : colorScheme.onSurfaceVariant,
+        // Icon with container background (M3 style)
+        Container(
+          width: 80,
+          height: 80,
+          decoration: BoxDecoration(
+            color: _selectedDirectory != null ? colorScheme.primaryContainer : colorScheme.surfaceContainerHighest,
+            borderRadius: BorderRadius.circular(24),
+          ),
+          child: Icon(
+            _selectedDirectory != null ? Icons.folder_rounded : Icons.create_new_folder_rounded,
+            size: 40,
+            color: _selectedDirectory != null ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant,
+          ),
        ),
-        const SizedBox(height: 16),
+        const SizedBox(height: 20),
        Text(
          _selectedDirectory != null ? 'Download Folder Selected!' : 'Choose Download Folder',
-          style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold),
+          style: Theme.of(context).textTheme.titleLarge?.copyWith(fontWeight: FontWeight.bold),
          textAlign: TextAlign.center,
        ),
        const SizedBox(height: 8),
        if (_selectedDirectory != null)
-          Container(
-            padding: const EdgeInsets.all(12),
-            decoration: BoxDecoration(
-              color: colorScheme.surfaceContainerHighest,
-              borderRadius: BorderRadius.circular(12),
-            ),
-            child: Row(
-              mainAxisSize: MainAxisSize.min,
-              children: [
-                Icon(Icons.folder, color: colorScheme.primary, size: 20),
-                const SizedBox(width: 8),
-                Flexible(
-                  child: Text(_selectedDirectory!,
-                    style: Theme.of(context).textTheme.bodySmall,
-                    overflow: TextOverflow.ellipsis),
-                ),
-              ],
+          Card(
+            elevation: 0,
+            color: colorScheme.surfaceContainerHigh,
+            shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
+            child: Padding(
+              padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+              child: Row(
+                mainAxisSize: MainAxisSize.min,
+                children: [
+                  Icon(Icons.folder_rounded, color: colorScheme.primary, size: 20),
+                  const SizedBox(width: 12),
+                  Flexible(
+                    child: Text(
+                      _selectedDirectory!,
+                      style: Theme.of(context).textTheme.bodySmall,
+                      overflow: TextOverflow.ellipsis,
+                    ),
+                  ),
+                ],
+              ),
            ),
          )
        else
-          Text('Select a folder where your downloaded music will be saved.',
-            style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: colorScheme.onSurfaceVariant),
-            textAlign: TextAlign.center),
-        const SizedBox(height: 20),
+          Padding(
+            padding: const EdgeInsets.symmetric(horizontal: 16),
+            child: Text(
+              'Select a folder where your downloaded music will be saved.',
+              style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: colorScheme.onSurfaceVariant),
+              textAlign: TextAlign.center,
+            ),
+          ),
+        const SizedBox(height: 24),
        FilledButton.icon(
          onPressed: _isLoading ? null : _selectDirectory,
          icon: _isLoading
              ? SizedBox(width: 20, height: 20,
                  child: CircularProgressIndicator(strokeWidth: 2, color: colorScheme.onPrimary))
-              : Icon(_selectedDirectory != null ? Icons.edit : Icons.folder_open),
+              : Icon(_selectedDirectory != null ? Icons.edit_rounded : Icons.folder_open_rounded),
          label: Text(_selectedDirectory != null ? 'Change Folder' : 'Select Folder'),
-          style: FilledButton.styleFrom(padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 12)),
+          style: FilledButton.styleFrom(
+            padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 14),
+            shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
+          ),
+        ),
+      ],
+    );
+  }
+
+  Widget _buildSpotifyApiStep(ColorScheme colorScheme) {
+    return Column(
+      mainAxisAlignment: MainAxisAlignment.center,
+      mainAxisSize: MainAxisSize.min,
+      children: [
+        // Icon with container background (M3 style)
+        Container(
+          width: 80,
+          height: 80,
+          decoration: BoxDecoration(
+            color: _useSpotifyApi ? colorScheme.primaryContainer : colorScheme.surfaceContainerHighest,
+            borderRadius: BorderRadius.circular(24),
+          ),
+          child: Icon(
+            Icons.api_rounded,
+            size: 40,
+            color: _useSpotifyApi ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant,
+          ),
+        ),
+        const SizedBox(height: 20),
+        Text(
+          'Spotify API (Optional)',
+          style: Theme.of(context).textTheme.titleLarge?.copyWith(fontWeight: FontWeight.bold),
+          textAlign: TextAlign.center,
+        ),
+        const SizedBox(height: 8),
+        Padding(
+          padding: const EdgeInsets.symmetric(horizontal: 16),
+          child: Text(
+            'Add your Spotify API credentials for better search results, or skip to use Deezer instead.',
+            style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: colorScheme.onSurfaceVariant),
+            textAlign: TextAlign.center,
+          ),
+        ),
+        const SizedBox(height: 24),
+        
+        // Toggle card (M3 style)
+        Card(
+          elevation: 0,
+          color: colorScheme.surfaceContainerHigh,
+          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
+          clipBehavior: Clip.antiAlias,
+          child: SwitchListTile(
+            contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 4),
+            title: Text('Use Spotify API', style: Theme.of(context).textTheme.titleSmall),
+            subtitle: Text(
+              _useSpotifyApi ? 'Enter your credentials below' : 'Using Deezer (no account needed)',
+              style: Theme.of(context).textTheme.bodySmall?.copyWith(color: colorScheme.onSurfaceVariant),
+            ),
+            secondary: Container(
+              width: 40,
+              height: 40,
+              decoration: BoxDecoration(
+                color: _useSpotifyApi ? colorScheme.primary : colorScheme.surfaceContainerHighest,
+                borderRadius: BorderRadius.circular(12),
+              ),
+              child: Icon(
+                _useSpotifyApi ? Icons.music_note_rounded : Icons.album_rounded,
+                size: 20,
+                color: _useSpotifyApi ? colorScheme.onPrimary : colorScheme.onSurfaceVariant,
+              ),
+            ),
+            value: _useSpotifyApi,
+            onChanged: (value) => setState(() => _useSpotifyApi = value),
+          ),
+        ),
+        
+        // Credentials form (animated)
+        AnimatedSize(
+          duration: const Duration(milliseconds: 300),
+          curve: Curves.easeInOut,
+          child: _useSpotifyApi ? Padding(
+            padding: const EdgeInsets.only(top: 16),
+            child: Card(
+              elevation: 0,
+              color: colorScheme.surfaceContainerHigh,
+              shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
+              child: Padding(
+                padding: const EdgeInsets.all(16),
+                child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: [
+                    // Client ID
+                    Text('Client ID', style: Theme.of(context).textTheme.labelMedium?.copyWith(color: colorScheme.onSurfaceVariant)),
+                    const SizedBox(height: 8),
+                    TextField(
+                      controller: _clientIdController,
+                      decoration: InputDecoration(
+                        hintText: 'Enter Spotify Client ID',
+                        prefixIcon: const Icon(Icons.key_rounded),
+                        border: OutlineInputBorder(
+                          borderRadius: BorderRadius.circular(12),
+                          borderSide: BorderSide.none,
+                        ),
+                        filled: true,
+                        fillColor: colorScheme.surfaceContainerHighest,
+                        contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 14),
+                      ),
+                    ),
+                    const SizedBox(height: 16),
+                    
+                    // Client Secret
+                    Text('Client Secret', style: Theme.of(context).textTheme.labelMedium?.copyWith(color: colorScheme.onSurfaceVariant)),
+                    const SizedBox(height: 8),
+                    TextField(
+                      controller: _clientSecretController,
+                      obscureText: !_showClientSecret,
+                      decoration: InputDecoration(
+                        hintText: 'Enter Spotify Client Secret',
+                        prefixIcon: const Icon(Icons.lock_rounded),
+                        suffixIcon: IconButton(
+                          icon: Icon(_showClientSecret ? Icons.visibility_off_rounded : Icons.visibility_rounded),
+                          onPressed: () => setState(() => _showClientSecret = !_showClientSecret),
+                        ),
+                        border: OutlineInputBorder(
+                          borderRadius: BorderRadius.circular(12),
+                          borderSide: BorderSide.none,
+                        ),
+                        filled: true,
+                        fillColor: colorScheme.surfaceContainerHighest,
+                        contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 14),
+                      ),
+                    ),
+                    const SizedBox(height: 16),
+                    
+                    // Info banner
+                    Container(
+                      padding: const EdgeInsets.all(12),
+                      decoration: BoxDecoration(
+                        color: colorScheme.tertiaryContainer,
+                        borderRadius: BorderRadius.circular(12),
+                      ),
+                      child: Row(
+                        children: [
+                          Icon(Icons.info_outline_rounded, size: 20, color: colorScheme.onTertiaryContainer),
+                          const SizedBox(width: 12),
+                          Expanded(
+                            child: Text(
+                              'Get credentials from developer.spotify.com',
+                              style: Theme.of(context).textTheme.bodySmall?.copyWith(color: colorScheme.onTertiaryContainer),
+                            ),
+                          ),
+                        ],
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+            ),
+          ) : const SizedBox.shrink(),
        ),
      ],
    );
@@ -551,6 +919,10 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
  Widget _buildNavigationButtons(ColorScheme colorScheme) {
    final isLastStep = _currentStep == _totalSteps - 1;
    final canProceed = _isStepCompleted(_currentStep);
+    
+    // For Spotify step, check if credentials are valid when enabled
+    final isSpotifyStepValid = !_useSpotifyApi || 
+        (_clientIdController.text.trim().isNotEmpty && _clientSecretController.text.trim().isNotEmpty);

    return Row(
      mainAxisAlignment: MainAxisAlignment.spaceBetween,
@@ -559,8 +931,11 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
        if (_currentStep > 0)
          TextButton.icon(
            onPressed: () => setState(() => _currentStep--),
-            icon: const Icon(Icons.arrow_back),
+            icon: const Icon(Icons.arrow_back_rounded),
            label: const Text('Back'),
+            style: TextButton.styleFrom(
+              padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+            ),
          )
        else
          const SizedBox(width: 100),
@@ -569,20 +944,32 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
        if (!isLastStep)
          FilledButton(
            onPressed: canProceed ? () => setState(() => _currentStep++) : null,
+            style: FilledButton.styleFrom(
+              padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 14),
+              shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
+            ),
            child: const Row(
              mainAxisSize: MainAxisSize.min,
-              children: [Text('Next'), SizedBox(width: 8), Icon(Icons.arrow_forward, size: 18)],
+              children: [Text('Next'), SizedBox(width: 8), Icon(Icons.arrow_forward_rounded, size: 18)],
            ),
          )
        else
          FilledButton(
-            onPressed: _selectedDirectory != null && !_isLoading ? _completeSetup : null,
+            onPressed: isSpotifyStepValid && !_isLoading ? _completeSetup : null,
+            style: FilledButton.styleFrom(
+              padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 14),
+              shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
+            ),
            child: _isLoading
                ? SizedBox(width: 20, height: 20,
                    child: CircularProgressIndicator(strokeWidth: 2, color: colorScheme.onPrimary))
-                : const Row(
+                : Row(
                    mainAxisSize: MainAxisSize.min,
-                    children: [Text('Get Started'), SizedBox(width: 8), Icon(Icons.check, size: 18)],
+                    children: [
+                      Text(_useSpotifyApi ? 'Get Started' : 'Skip & Start'),
+                      const SizedBox(width: 8),
+                      const Icon(Icons.check_rounded, size: 18),
+                    ],
                  ),
          ),
      ],
@@ -759,17 +759,21 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
    });

    try {
+      // Add timeout to prevent infinite loading
      final result = await PlatformBridge.getLyricsLRC(
        item.spotifyId ?? '',
        item.trackName,
        item.artistName,
        filePath: _fileExists ? item.filePath : null, // Try embedded lyrics first
+      ).timeout(
+        const Duration(seconds: 20),
+        onTimeout: () => '', // Return empty string on timeout
      );
      
      if (mounted) {
        if (result.isEmpty) {
          setState(() {
-            _lyricsError = 'Lyrics not found';
+            _lyricsError = 'Lyrics not available for this track';
            _lyricsLoading = false;
          });
        } else {
@@ -783,8 +787,11 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
      }
    } catch (e) {
      if (mounted) {
+        final errorMsg = e.toString().contains('TimeoutException') 
+            ? 'Request timed out. Try again later.'
+            : 'Failed to load lyrics';
        setState(() {
-          _lyricsError = 'Failed to load lyrics';
+          _lyricsError = errorMsg;
          _lyricsLoading = false;
        });
      }
@@ -1,12 +1,31 @@
 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:flutter/services.dart';
+import 'package:path_provider/path_provider.dart';
 import 'package:spotiflac_android/utils/logger.dart';

 final _log = AppLogger('FFmpeg');

 /// FFmpeg service for audio conversion and remuxing
+/// Uses native MethodChannel to call FFmpegKit from local AAR
 class FFmpegService {
+  static const _channel = MethodChannel('com.zarz.spotiflac/ffmpeg');
+
+  /// Execute FFmpeg command and return result
+  static Future<FFmpegResult> _execute(String command) async {
+    try {
+      final result = await _channel.invokeMethod('execute', {'command': command});
+      final map = Map<String, dynamic>.from(result);
+      return FFmpegResult(
+        success: map['success'] as bool,
+        returnCode: map['returnCode'] as int,
+        output: map['output'] as String,
+      );
+    } catch (e) {
+      _log.e('FFmpeg execute error: $e');
+      return FFmpegResult(success: false, returnCode: -1, output: e.toString());
+    }
+  }
+
  /// Convert M4A (DASH segments) to FLAC
  /// Returns the output file path on success, null on failure
  static Future<String?> convertM4aToFlac(String inputPath) async {
@@ -16,10 +35,9 @@ class FFmpegService {
    final command =
        '-i "$inputPath" -c:a flac -compression_level 8 "$outputPath" -y';

-    final session = await FFmpegKit.execute(command);
-    final returnCode = await session.getReturnCode();
+    final result = await _execute(command);

-    if (ReturnCode.isSuccess(returnCode)) {
+    if (result.success) {
      // Delete original M4A file
      try {
        await File(inputPath).delete();
@@ -27,12 +45,7 @@ class FFmpegService {
      return outputPath;
    }

-    // Log error for debugging
-    final logs = await session.getLogs();
-    for (final log in logs) {
-      _log.d(log.getMessage());
-    }
-
+    _log.e('M4A to FLAC conversion failed: ${result.output}');
    return null;
  }

@@ -54,13 +67,13 @@ class FFmpegService {
    final command =
        '-i "$inputPath" -codec:a libmp3lame -b:a $bitrate -map 0:a -map_metadata 0 -id3v2_version 3 "$outputPath" -y';

-    final session = await FFmpegKit.execute(command);
-    final returnCode = await session.getReturnCode();
+    final result = await _execute(command);

-    if (ReturnCode.isSuccess(returnCode)) {
+    if (result.success) {
      return outputPath;
    }

+    _log.e('FLAC to MP3 conversion failed: ${result.output}');
    return null;
  }

@@ -91,22 +104,21 @@ class FFmpegService {
          '-i "$inputPath" -codec:a aac -b:a $bitrate -map 0:a -map_metadata 0 "$outputPath" -y';
    }

-    final session = await FFmpegKit.execute(command);
-    final returnCode = await session.getReturnCode();
+    final result = await _execute(command);

-    if (ReturnCode.isSuccess(returnCode)) {
+    if (result.success) {
      return outputPath;
    }

+    _log.e('FLAC to M4A conversion 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);
+      final version = await _channel.invokeMethod('getVersion');
+      return version != null && version.toString().isNotEmpty;
    } catch (e) {
      return false;
    }
@@ -115,11 +127,116 @@ class FFmpegService {
  /// Get FFmpeg version info
  static Future<String?> getVersion() async {
    try {
-      final session = await FFmpegKit.execute('-version');
-      final output = await session.getOutput();
-      return output;
+      final version = await _channel.invokeMethod('getVersion');
+      return version as String?;
    } catch (e) {
      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 {
+    // Android Scoped Storage: Cannot write directly to Music folder with FFmpeg
+    // Use app-internal cache directory for temp output
+    final tempDir = await getTemporaryDirectory();
+    final uniqueId = DateTime.now().millisecondsSinceEpoch;
+    final tempOutput = '${tempDir.path}/temp_embed_$uniqueId.flac';
+    
+    // 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 {
+        // Copy temp output back to original location (replace)
+        final tempFile = File(tempOutput);
+        final originalFile = File(flacPath);
+        
+        if (await tempFile.exists()) {
+             // Delete original file
+             if (await originalFile.exists()) {
+               await originalFile.delete();
+             }
+             // Copy temp file to original location
+             await tempFile.copy(flacPath);
+             // Delete temp file
+             await tempFile.delete();
+             
+             return flacPath;
+        } else {
+             _log.e('Temp output file not found: $tempOutput');
+             return null;
+        }
+
+      } 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;
+  }
+}
+
+/// Result of FFmpeg command execution
+class FFmpegResult {
+  final bool success;
+  final int returnCode;
+  final String output;
+
+  FFmpegResult({
+    required this.success,
+    required this.returnCode,
+    required this.output,
+  });
 }
@@ -65,6 +65,7 @@ class PlatformBridge {
    int totalTracks = 1,
    String? releaseDate,
    String? itemId,
+    int durationMs = 0,
  }) async {
    final request = jsonEncode({
      'isrc': isrc,
@@ -85,6 +86,7 @@ class PlatformBridge {
      'total_tracks': totalTracks,
      'release_date': releaseDate ?? '',
      'item_id': itemId ?? '',
+      'duration_ms': durationMs,
    });
    
    final result = await _channel.invokeMethod('downloadTrack', request);
@@ -109,8 +111,9 @@ class PlatformBridge {
    int discNumber = 1,
    int totalTracks = 1,
    String? releaseDate,
-    String preferredService = 'tidal',
+    String preferredService = 'qobuz',
    String? itemId,
+    int durationMs = 0,
  }) async {
    final request = jsonEncode({
      'isrc': isrc,
@@ -131,6 +134,7 @@ class PlatformBridge {
      'total_tracks': totalTracks,
      'release_date': releaseDate ?? '',
      'item_id': itemId ?? '',
+      'duration_ms': durationMs,
    });
    
    final result = await _channel.invokeMethod('downloadWithFallback', request);
@@ -293,4 +297,71 @@ class PlatformBridge {
      'client_secret': clientSecret,
    });
  }
+
+  /// Pre-warm track ID cache for album/playlist tracks
+  /// This runs in background and returns immediately
+  /// Speeds up subsequent downloads by caching ISRC → Track ID mappings
+  static Future<void> preWarmTrackCache(List<Map<String, String>> tracks) async {
+    final tracksJson = jsonEncode(tracks);
+    await _channel.invokeMethod('preWarmTrackCache', {'tracks': tracksJson});
+  }
+
+  /// Get current track cache size
+  static Future<int> getTrackCacheSize() async {
+    final result = await _channel.invokeMethod('getTrackCacheSize');
+    return result as int;
+  }
+
+  /// Clear track ID cache
+  static Future<void> clearTrackCache() async {
+    await _channel.invokeMethod('clearTrackCache');
+  }
+
+  // ==================== DEEZER API ====================
+
+  /// Search Deezer for tracks and artists (no API key required)
+  static Future<Map<String, dynamic>> searchDeezerAll(String query, {int trackLimit = 15, int artistLimit = 3}) async {
+    final result = await _channel.invokeMethod('searchDeezerAll', {
+      'query': query,
+      'track_limit': trackLimit,
+      'artist_limit': artistLimit,
+    });
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Get Deezer metadata by type and ID
+  static Future<Map<String, dynamic>> getDeezerMetadata(String resourceType, String resourceId) async {
+    final result = await _channel.invokeMethod('getDeezerMetadata', {
+      'resource_type': resourceType,
+      'resource_id': resourceId,
+    });
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Parse Deezer URL and return type and ID
+  static Future<Map<String, dynamic>> parseDeezerUrl(String url) async {
+    final result = await _channel.invokeMethod('parseDeezerUrl', {'url': url});
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Search Deezer by ISRC
+  static Future<Map<String, dynamic>> searchDeezerByISRC(String isrc) async {
+    final result = await _channel.invokeMethod('searchDeezerByISRC', {'isrc': isrc});
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Convert Spotify track to Deezer and get metadata (for rate limit fallback)
+  static Future<Map<String, dynamic>> convertSpotifyToDeezer(String resourceType, String spotifyId) async {
+    final result = await _channel.invokeMethod('convertSpotifyToDeezer', {
+      'resource_type': resourceType,
+      'spotify_id': spotifyId,
+    });
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Get Spotify metadata with automatic Deezer fallback on rate limit
+  static Future<Map<String, dynamic>> getSpotifyMetadataWithFallback(String url) async {
+    final result = await _channel.invokeMethod('getSpotifyMetadataWithFallback', {'url': url});
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
 }
@@ -12,6 +12,7 @@ class UpdateInfo {
  final String downloadUrl;
  final String? apkDownloadUrl;
  final DateTime publishedAt;
+  final bool isPrerelease;

  const UpdateInfo({
    required this.version,
@@ -19,11 +20,13 @@ class UpdateInfo {
    required this.downloadUrl,
    this.apkDownloadUrl,
    required this.publishedAt,
+    this.isPrerelease = false,
  });
 }

 class UpdateChecker {
-  static const String _apiUrl = 'https://api.github.com/repos/${AppInfo.githubRepo}/releases/latest';
+  static const String _latestApiUrl = 'https://api.github.com/repos/${AppInfo.githubRepo}/releases/latest';
+  static const String _allReleasesApiUrl = 'https://api.github.com/repos/${AppInfo.githubRepo}/releases';

  static Future<String> _getDeviceArch() async {
    if (!Platform.isAndroid) return 'unknown';
@@ -55,30 +58,59 @@ class UpdateChecker {
    }
  }

-  static Future<UpdateInfo?> checkForUpdate() async {
+  /// Check for updates based on channel preference
+  /// [channel] can be 'stable' or 'preview'
+  static Future<UpdateInfo?> checkForUpdate({String channel = 'stable'}) async {
    try {
-      final response = await http.get(
-        Uri.parse(_apiUrl),
-        headers: {'Accept': 'application/vnd.github.v3+json'},
-      ).timeout(const Duration(seconds: 10));
+      Map<String, dynamic>? releaseData;
+      
+      if (channel == 'preview') {
+        // For preview channel, get all releases and find the latest (including prereleases)
+        final response = await http.get(
+          Uri.parse('$_allReleasesApiUrl?per_page=10'),
+          headers: {'Accept': 'application/vnd.github.v3+json'},
+        ).timeout(const Duration(seconds: 10));

-      if (response.statusCode != 200) {
-        _log.w('GitHub API returned ${response.statusCode}');
-        return null;
+        if (response.statusCode != 200) {
+          _log.w('GitHub API returned ${response.statusCode}');
+          return null;
+        }
+
+        final releases = jsonDecode(response.body) as List<dynamic>;
+        if (releases.isEmpty) {
+          _log.i('No releases found');
+          return null;
+        }
+        
+        // First release is the latest (including prereleases)
+        releaseData = releases.first as Map<String, dynamic>;
+      } else {
+        // For stable channel, use /latest endpoint (excludes prereleases)
+        final response = await http.get(
+          Uri.parse(_latestApiUrl),
+          headers: {'Accept': 'application/vnd.github.v3+json'},
+        ).timeout(const Duration(seconds: 10));
+
+        if (response.statusCode != 200) {
+          _log.w('GitHub API returned ${response.statusCode}');
+          return null;
+        }
+
+        releaseData = jsonDecode(response.body) as Map<String, dynamic>;
      }

-      final data = jsonDecode(response.body) as Map<String, dynamic>;
-      final tagName = data['tag_name'] as String? ?? '';
+      final tagName = releaseData['tag_name'] as String? ?? '';
      final latestVersion = tagName.replaceFirst('v', '');
+      final isPrerelease = releaseData['prerelease'] as bool? ?? false;
      
      if (!_isNewerVersion(latestVersion, AppInfo.version)) {
-        _log.i('No update available (current: ${AppInfo.version}, latest: $latestVersion)');
+        _log.i('No update available (current: ${AppInfo.version}, latest: $latestVersion, channel: $channel)');
        return null;
      }

-      final body = data['body'] as String? ?? 'No changelog available';
-      final htmlUrl = data['html_url'] as String? ?? '${AppInfo.githubUrl}/releases';
-      final publishedAt = DateTime.tryParse(data['published_at'] as String? ?? '') ?? DateTime.now();
+      final body = releaseData['body'] as String? ?? 'No changelog available';
+      final htmlUrl = releaseData['html_url'] as String? ?? '${AppInfo.githubUrl}/releases';
+      final publishedAt = DateTime.tryParse(releaseData['published_at'] as String? ?? '') ?? DateTime.now();

      final deviceArch = await _getDeviceArch();
      _log.d('Device architecture: $deviceArch');
@@ -87,7 +119,7 @@ class UpdateChecker {
      String? arm32Url;
      String? universalUrl;
      
-      final assets = data['assets'] as List<dynamic>? ?? [];
+      final assets = releaseData['assets'] as List<dynamic>? ?? [];
      for (final asset in assets) {
        final name = (asset['name'] as String? ?? '').toLowerCase();
        if (name.endsWith('.apk')) {
@@ -117,7 +149,7 @@ class UpdateChecker {
        apkUrl = universalUrl ?? arm64Url ?? arm32Url;
      }

-      _log.i('Update available: $latestVersion, APK URL: $apkUrl');
+      _log.i('Update available: $latestVersion (prerelease: $isPrerelease), APK URL: $apkUrl');
      
      return UpdateInfo(
        version: latestVersion,
@@ -125,6 +157,7 @@ class UpdateChecker {
        downloadUrl: htmlUrl,
        apkDownloadUrl: apkUrl,
        publishedAt: publishedAt,
+        isPrerelease: isPrerelease,
      );
    } catch (e) {
      _log.e('Error checking for updates: $e');
@@ -43,6 +43,7 @@ class AppTheme {
  static ThemeData dark({
    ColorScheme? dynamicScheme,
    Color? seedColor,
+    bool isAmoled = false,
  }) {
    final scheme = dynamicScheme ??
        ColorScheme.fromSeed(
@@ -53,7 +54,8 @@ class AppTheme {
    return ThemeData(
      useMaterial3: true,
      colorScheme: scheme,
-      appBarTheme: _appBarTheme(scheme),
+      scaffoldBackgroundColor: isAmoled ? Colors.black : null,
+      appBarTheme: _appBarTheme(scheme, isAmoled: isAmoled),
      cardTheme: _cardTheme(scheme),
      elevatedButtonTheme: _elevatedButtonTheme(scheme),
      filledButtonTheme: _filledButtonTheme(scheme),
@@ -63,7 +65,7 @@ class AppTheme {
      inputDecorationTheme: _inputDecorationTheme(scheme),
      listTileTheme: _listTileTheme(scheme),
      dialogTheme: _dialogTheme(scheme),
-      navigationBarTheme: _navigationBarTheme(scheme),
+      navigationBarTheme: _navigationBarTheme(scheme, isAmoled: isAmoled),
      snackBarTheme: _snackBarTheme(scheme),
      progressIndicatorTheme: _progressIndicatorTheme(scheme),
      switchTheme: _switchTheme(scheme),
@@ -73,12 +75,12 @@ class AppTheme {
  }

  /// AppBar theme
-  static AppBarTheme _appBarTheme(ColorScheme scheme) => AppBarTheme(
+  static AppBarTheme _appBarTheme(ColorScheme scheme, {bool isAmoled = false}) => AppBarTheme(
        elevation: 0,
-        scrolledUnderElevation: 3,
-        backgroundColor: scheme.surface,
+        scrolledUnderElevation: isAmoled ? 0 : 3,
+        backgroundColor: isAmoled ? Colors.black : scheme.surface,
        foregroundColor: scheme.onSurface,
-        surfaceTintColor: scheme.surfaceTint,
+        surfaceTintColor: isAmoled ? Colors.transparent : scheme.surfaceTint,
        centerTitle: true,
        titleTextStyle: TextStyle(
          color: scheme.onSurface,
@@ -180,12 +182,12 @@ class AppTheme {
      );

  /// Navigation bar theme
-  static NavigationBarThemeData _navigationBarTheme(ColorScheme scheme) =>
+  static NavigationBarThemeData _navigationBarTheme(ColorScheme scheme, {bool isAmoled = false}) =>
      NavigationBarThemeData(
        elevation: 0,
-        backgroundColor: scheme.surfaceContainer,
+        backgroundColor: isAmoled ? Colors.black : scheme.surfaceContainer,
        indicatorColor: scheme.secondaryContainer,
-        surfaceTintColor: scheme.surfaceTint,
+        surfaceTintColor: isAmoled ? Colors.transparent : scheme.surfaceTint,
        labelBehavior: NavigationDestinationLabelBehavior.alwaysShow,
      );

@@ -40,12 +40,32 @@ class DynamicColorWrapper extends ConsumerWidget {
          );
        }

+        // Apply AMOLED mode if enabled (pure black background)
+        if (themeSettings.useAmoled) {
+          darkScheme = _applyAmoledColors(darkScheme);
+        }
+
        // Build themes
        final lightTheme = AppTheme.light(dynamicScheme: lightScheme);
-        final darkTheme = AppTheme.dark(dynamicScheme: darkScheme);
+        final darkTheme = AppTheme.dark(dynamicScheme: darkScheme, isAmoled: themeSettings.useAmoled);

        return builder(lightTheme, darkTheme, themeSettings.themeMode);
      },
    );
  }
+
+  /// Apply AMOLED colors - pure black background with adjusted surface colors
+  ColorScheme _applyAmoledColors(ColorScheme scheme) {
+    return scheme.copyWith(
+      surface: Colors.black,
+      onSurface: Colors.white,
+      surfaceContainerLowest: Colors.black,
+      surfaceContainerLow: const Color(0xFF0A0A0A),
+      surfaceContainer: const Color(0xFF121212),
+      surfaceContainerHigh: const Color(0xFF1A1A1A),
+      surfaceContainerHighest: const Color(0xFF222222),
+      inverseSurface: Colors.white,
+      onInverseSurface: Colors.black,
+    );
+  }
 }
@@ -297,22 +297,6 @@ packages:
      url: "https://pub.dev"
    source: hosted
    version: "2.1.4"
-  ffmpeg_kit_flutter_new_audio:
-    dependency: "direct main"
-    description:
-      name: ffmpeg_kit_flutter_new_audio
-      sha256: "0a698b46cd163c8e9917af75325c84d27871a2a8b2c37de3b40486cd0ab662ae"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.0.0"
-  ffmpeg_kit_flutter_platform_interface:
-    dependency: transitive
-    description:
-      name: ffmpeg_kit_flutter_platform_interface
-      sha256: addf046ae44e190ad0101b2fde2ad909a3cd08a2a109f6106d2f7048b7abedee
-      url: "https://pub.dev"
-    source: hosted
-    version: "0.2.1"
  file:
    dependency: transitive
    description:
@@ -1,7 +1,7 @@
 name: spotiflac_android
 description: Download Spotify tracks in FLAC from Tidal, Qobuz & Amazon Music
-publish_to: 'none'
-version: 2.0.3+33
+publish_to: "none"
+version: 2.1.7+45

 environment:
  sdk: ^3.10.0
@@ -9,51 +9,51 @@ environment:
 dependencies:
  flutter:
    sdk: flutter
-  
+
  # State Management
  flutter_riverpod: ^3.1.0
  riverpod_annotation: ^4.0.0
-  
+
  # Navigation
  go_router: ^17.0.1
-  
+
  # Storage & Persistence
  shared_preferences: ^2.5.3
  path_provider: ^2.1.5
-  
+
  # HTTP & Network
  http: ^1.4.0
  dio: ^5.8.0
-  
+
  # UI Components
  cupertino_icons: ^1.0.8
  cached_network_image: ^3.4.1
  flutter_svg: ^2.1.0
-  
+
  # Material Expressive 3 / Dynamic Color
  dynamic_color: ^1.7.0
  material_color_utilities: ^0.11.1
-  
+
  # Permissions
  permission_handler: ^12.0.1
-  
+
  # File Picker
  file_picker: ^10.3.0
-  
+
  # JSON Serialization
  json_annotation: ^4.9.0
-  
+
  # Utils
  url_launcher: ^6.3.1
  device_info_plus: ^12.3.0
  share_plus: ^12.0.1
  receive_sharing_intent: ^1.8.1
  logger: ^2.5.0
-  
-  # FFmpeg for audio conversion (audio-only version - much smaller)
-  ffmpeg_kit_flutter_new_audio: ^2.0.0
+
+  # FFmpeg - using local custom AAR (arm64-v8a + armeabi-v7a only)
+  # ffmpeg_kit_flutter_new_audio: ^2.0.0  # Replaced with local AAR
  open_filex: ^4.7.0
-  
+
  # Notifications
  flutter_local_notifications: ^19.0.0

@@ -77,6 +77,6 @@ flutter_launcher_icons:

 flutter:
  uses-material-design: true
-  
+
  assets:
    - assets/images/
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
zarzet	74bc747599	chore: update to v2.1.7 with new icons	2026-01-09 17:54:50 +07:00
zarzet	cbc8fdcb0c	feat: add download badges to release page	2026-01-09 17:25:01 +07:00
zarzet	3b79b4f1ca	fix: use absolute path for IPA creation	2026-01-09 02:41:19 +07:00
zarzet	5692a76650	Fix: iOS embedMetadata method + Android APK path detection	2026-01-09 02:31:01 +07:00
zarzet	7a009ad0af	Fix R8: add dontwarn for Play Core and javax.xml.stream	2026-01-09 02:19:37 +07:00
zarzet	e5e75e7092	Fix iOS build: use xcodebuild with CODE_SIGNING_ALLOWED=NO	2026-01-09 02:18:54 +07:00
zarzet	01b8fd2480	Fix metadata consistency (Go->Flutter) and build optimization - Backend: Return full metadata (Track, Disc, Year) from Tidal/Qobuz/Amazon download results - Flutter: Use backend metadata for tagging converted M4A and history entries - Fix: Duplicate convertTrack method in deezer.go - Fix: Better error message for Deezer fallback failure - Changed: Default service fallback to Tidal -> Qobuz -> Amazon - Build: Re-enabled resource shrinking and minification for release build	2026-01-09 02:12:24 +07:00
Zarz Eleutherius	ee807a44cc	Update instructions for using Spotify API	2026-01-08 13:36:10 +07:00
Zarz Eleutherius	c9b905eb18	Update VirusTotal badge link in README.md	2026-01-08 01:08:32 +07:00
zarzet	e9c7bf830e	Update changelog for v2.1.5	2026-01-08 00:53:38 +07:00
zarzet	8bc97d5bd3	v2.1.5: Deezer API 2.0, Qobuz default, fetch ISRC for search results	2026-01-08 00:52:24 +07:00
zarzet	f2c241c323	Fix .tmp permission issue on Android Music folder	2026-01-08 00:26:49 +07:00
zarzet	9c512ffe28	Add migration for Deezer default (skip if custom Spotify enabled)	2026-01-07 23:19:04 +07:00
zarzet	53a1da6249	v2.1.5: Fix progress bar and incomplete downloads - Fix progress bar jumping from 1% to 100% (threshold-based updates) - Fix incomplete downloads with temp file + size validation - Applies to Tidal, Qobuz, and Amazon services	2026-01-07 23:15:48 +07:00
Zarz Eleutherius	d4274e8ca8	Include setup instructions for Spotify API usage Added detailed instructions for setting up Spotify as a search source, including steps for creating a developer account and entering credentials.	2026-01-07 13:55:31 +07:00
Zarz Eleutherius	49a9f12841	Simplify README by removing Spotify setup details Removed detailed instructions for using Spotify and support section.	2026-01-07 13:53:30 +07:00
zarzet	d7fa040e3c	fix: Deezer artist/album screen improvements - Fix album_screen to support Deezer album IDs (deezer:xxx format) - Use getSpotifyMetadataWithFallback for Spotify albums - Hide track count in artist discography when not available from Deezer API - Deezer /artist/{id}/albums endpoint doesn't return nb_tracks	2026-01-07 04:25:35 +07:00
zarzet	9baa1e2088	fix: Replace android-actions/setup-android with direct SDK setup	2026-01-07 03:38:00 +07:00
zarzet	482457205a	feat: Add Deezer as alternative metadata source with auto-fallback - Add Deezer API client (no auth required, rate limit per user IP) - Add search source selector in Settings (Deezer/Spotify) - Default to Deezer for better reliability - Auto-fallback to Deezer when Spotify API is rate limited (429) - Support fallback for tracks and albums via SongLink API - Update README with metadata source documentation - Version 2.1.5-preview (build 42)	2026-01-07 03:25:14 +07:00
zarzet	3b2ec319e2	Fix pubspec version to 2.1.0+41	2026-01-07 00:19:53 +07:00
zarzet	a0f7e75a9a	Update VirusTotal badge to 2.1.0	2026-01-07 00:15:43 +07:00
zarzet	c725e53e4c	Release 2.1.0	2026-01-07 00:00:28 +07:00
zarzet	1d7c43a302	v2.1.0-preview: Download speed optimizations	2026-01-06 03:56:26 +07:00
Zarz Eleutherius	df7c1c5bb7	Add VirusTotal badge to README Added VirusTotal badge to README for safety verification.	2026-01-06 02:05:50 +07:00
zarzet	bb05353b7e	fix(ios): directory picker - add App Documents option for iOS - iOS limitation: empty folders cannot be selected via document picker - Added bottom sheet with App Documents Folder as recommended option - Shows info message explaining iOS limitation - Files accessible via iOS Files app Version: 2.0.7-preview2+38	2026-01-06 00:23:19 +07:00
zarzet	7ac92d77e5	chore: add custom FFmpeg AAR to repo for CI builds	2026-01-05 14:23:41 +07:00
zarzet	cf00ecb756	feat: use custom FFmpeg AAR for Android, reduce APK size - Replace ffmpeg_kit_flutter plugin with custom AAR (arm64 + arm7a only) - Add MethodChannel bridge for FFmpeg in MainActivity - Create separate pubspec_ios.yaml for iOS builds with ffmpeg_kit plugin - Update GitHub workflow to swap pubspec for iOS builds - Reduces Android APK size by ~50MB	2026-01-05 14:09:32 +07:00
zarzet	525f2fd0cd	chore: bump version to 2.0.6+36	2026-01-05 12:21:05 +07:00
zarzet	3e841cef06	fix: duration display, audio quality from file, artist verification, metadata case-sensitivity, settings navigation freeze - Fix duration showing incorrect values (ms to seconds conversion) - Read audio quality from FLAC file instead of trusting API - Add artist verification for Tidal/Qobuz/Amazon downloads - Fix FLAC metadata case-insensitive replacement - Fix settings navigation freeze on Android 14+ (PopScope handling)	2026-01-05 10:30:57 +07:00
zarzet	a8527df80a	docs: application stabilized, remove dev notice	2026-01-05 03:12:30 +07:00
zarzet	51b2ad5c77	v2.0.5: Large playlist support + duration verification fix - Add pagination for playlists (up to 1000 tracks) - Add duration verification to prevent wrong track downloads - When Tidal returns wrong version, fallback to Qobuz/Amazon	2026-01-05 03:08:15 +07:00
zarzet	d641a517b8	ci: Fix disk cleanup - only remove safe directories	2026-01-04 12:09:13 +07:00
zarzet	608fa2ca74	ci: Fix disk cleanup - don't remove Android SDK path	2026-01-04 12:08:18 +07:00
zarzet	343b309314	ci: Add disk cleanup step to fix runner space issue	2026-01-04 12:01:34 +07:00
zarzet	0787b32dd8	v2.0.4: Fix Android 11 storage permission denied	2026-01-04 11:51:09 +07:00
zarzet	6927fdf7a9	fix: Android 11 storage permission denied issue	2026-01-04 11:48:19 +07:00
zarzet	fe6af34478	Update screenshots	2026-01-04 00:14:33 +07:00