added audio output for demo songs since spotify api doesnt support audio streaming

CHALLENGE_2/sleepysound/lib/services/music_queue_service.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/foundation.dart';
 import '../models/spotify_track.dart';
 import '../services/spotify_service.dart';
+import '../services/audio_service.dart';
 
 class QueueItem {
   final SpotifyTrack track;
@@ -33,11 +34,10 @@ class MusicQueueService extends ChangeNotifier {
   MusicQueueService._internal();
 
   final SpotifyService _spotifyService = SpotifyService();
+  final AudioService _audioService = AudioService();
   
   // Current playing track
   SpotifyTrack? _currentTrack;
-  bool _isPlaying = false;
-  double _progress = 0.0;
   
   // Queue management
   final List<QueueItem> _queue = [];
@@ -46,9 +46,9 @@ class MusicQueueService extends ChangeNotifier {
   final List<SpotifyTrack> _recentlyPlayed = [];
   
   // Getters
-  SpotifyTrack? get currentTrack => _currentTrack;
-  bool get isPlaying => _isPlaying;
-  double get progress => _progress;
+  SpotifyTrack? get currentTrack => _audioService.currentTrack ?? _currentTrack;
+  bool get isPlaying => _audioService.isPlaying;
+  double get progress => _audioService.progress;
   List<QueueItem> get queue => List.unmodifiable(_queue);
   List<SpotifyTrack> get recentlyPlayed => List.unmodifiable(_recentlyPlayed);
   
@@ -102,13 +102,14 @@ class MusicQueueService extends ChangeNotifier {
     });
   }
   
-  // Playback simulation
-  void playNext() {
+  // Playback control
+  Future<void> playNext() async {
     if (_queue.isNotEmpty) {
       final nextItem = _queue.removeAt(0);
       _currentTrack = nextItem.track;
-      _isPlaying = true;
-      _progress = 0.0;
+      
+      // Use audio service to actually play the track
+      await _audioService.playTrack(nextItem.track);
       
       // Add to recently played
       _recentlyPlayed.insert(0, nextItem.track);
@@ -118,37 +119,25 @@ class MusicQueueService extends ChangeNotifier {
       
       notifyListeners();
       print('Now playing: ${_currentTrack!.name} by ${_currentTrack!.artistNames}');
-      
-      // Simulate track progress
-      _simulatePlayback();
     }
   }
   
-  void togglePlayPause() {
-    _isPlaying = !_isPlaying;
+  Future<void> togglePlayPause() async {
+    await _audioService.togglePlayPause();
     notifyListeners();
   }
   
-  void skipTrack() {
-    playNext();
+  Future<void> skipTrack() async {
+    await playNext();
   }
   
-  void _simulatePlayback() {
-    if (_currentTrack == null) return;
-    
-    // Simulate track progress over time
-    Future.delayed(const Duration(seconds: 1), () {
-      if (_isPlaying && _currentTrack != null) {
-        _progress += 1.0 / (_currentTrack!.durationMs / 1000);
-        if (_progress >= 1.0) {
-          // Track finished, play next
-          playNext();
-        } else {
-          notifyListeners();
-          _simulatePlayback();
-        }
-      }
-    });
+  Future<void> seekTo(double position) async {
+    if (_audioService.totalDuration != Duration.zero) {
+      final seekPosition = Duration(
+        milliseconds: (position * _audioService.totalDuration.inMilliseconds).round(),
+      );
+      await _audioService.seekTo(seekPosition);
+    }
   }
   
   // Initialize with some popular tracks
@@ -165,9 +154,14 @@ class MusicQueueService extends ChangeNotifier {
           _queue.add(queueItem);
         }
         
+        // Set up audio service callback for track completion
+        _audioService.onTrackComplete = () {
+          playNext();
+        };
+        
         // Start playing the first track
         if (_queue.isNotEmpty) {
-          playNext();
+          await playNext();
         }
         
         notifyListeners();
@@ -189,16 +183,18 @@ class MusicQueueService extends ChangeNotifier {
   
   // Get current track info for display
   Map<String, dynamic>? get currentTrackInfo {
-    if (_currentTrack == null) return null;
+    final track = currentTrack;
+    if (track == null) return null;
     
     return {
-      'title': _currentTrack!.name,
-      'artist': _currentTrack!.artistNames,
-      'album': _currentTrack!.album.name,
-      'imageUrl': _currentTrack!.imageUrl,
-      'duration': _currentTrack!.duration,
-      'progress': _progress,
-      'isPlaying': _isPlaying,
+      'title': track.name,
+      'artist': track.artistNames,
+      'album': track.album.name,
+      'imageUrl': track.imageUrl,
+      'duration': _audioService.totalDurationString,
+      'currentTime': _audioService.currentPositionString,
+      'progress': progress,
+      'isPlaying': isPlaying,
     };
   }
 }