通知中心封面图显示

部分界面的信息更新
缓存系统初步引入
即将进入播放列表更新

lib/services/audio_service.dart

@@ -1,10 +1,13 @@
 // lib/services/audio_service.dart
 import 'dart:async';
+import 'dart:io';
+import 'dart:typed_data';
 import 'package:flutter/material.dart';
-import 'package:media_kit/media_kit.dart';
+import 'package:path_provider/path_provider.dart';
 import 'playback_service.dart';
 import '../metadata/metadata_service.dart';
-import 'dart:typed_data';
+import '../database/song_database.dart';
+import '../utils/artwork_helper.dart';
 
 enum PlayMode {
   sequential,
@@ -44,7 +47,7 @@ class AudioService extends ChangeNotifier {
   List<int> _shuffledIndices = [];
   int _shuffledIndex = -1;
 
-  // ---- 高频进度（ValueNotifier，不触发全局重建） ----
+  // ---- 高频进度 ----
   final ValueNotifier<Duration> positionNotifier = ValueNotifier(Duration.zero);
   final ValueNotifier<Duration> durationNotifier = ValueNotifier(Duration.zero);
   final ValueNotifier<Duration> bufferedNotifier = ValueNotifier(Duration.zero);
@@ -55,7 +58,6 @@ class AudioService extends ChangeNotifier {
   bool _handlingCompletion = false;
   void Function(Song)? _onSongChanged;
 
-  // ⭐ 防 seek 覆盖标志
   bool _isUserSeeking = false;
 
   // ---- Getter ----
@@ -81,12 +83,10 @@ class AudioService extends ChangeNotifier {
     }
   }
 
-  // ---- 注册回调 ----
   void setOnSongChanged(void Function(Song) callback) {
     _onSongChanged = callback;
   }
 
-  // ---- 切换播放模式 ----
   void togglePlayMode() {
     switch (_playMode) {
       case PlayMode.sequential:
@@ -102,7 +102,6 @@ class AudioService extends ChangeNotifier {
     notifyListeners();
   }
 
-  // ---- 设置播放队列 ----
   void setQueue(List<Song> queue, {int startIndex = 0}) {
     if (queue.isEmpty) {
       _clearQueue();
@@ -131,7 +130,6 @@ class AudioService extends ChangeNotifier {
     stopPlay();
   }
 
-  // ---- 播放指定歌曲 ----
   Future<void> playSong(Song song) async {
     if (_queue.isEmpty || _queue[_currentIndex].id != song.id) {
       setQueue([song], startIndex: 0);
@@ -140,7 +138,6 @@ class AudioService extends ChangeNotifier {
     }
   }
 
-  // ---- 核心：播放当前歌曲 ----
   void _playCurrent() {
     if (_currentIndex < 0 || _currentIndex >= _queue.length) {
       stopPlay();
@@ -159,13 +156,16 @@ class AudioService extends ChangeNotifier {
 
     PlaybackService().play(song.url!);
 
-    // 延迟同步兜底（解决首次加载时 stream 未推送的问题）
     _syncPlayerStateDelayed();
 
     _loadMetadataForCurrentSong();
   }
 
-  // ---- 加载 metadata ----
+  String _generateSongKey(String url, int fileSize, int modifiedTime) {
+    final raw = '$url|$fileSize|$modifiedTime';
+    return raw.hashCode.toString();
+  }
+
   Future<void> _loadMetadataForCurrentSong() async {
     if (_currentIndex < 0 || _currentIndex >= _queue.length) return;
     final song = _queue[_currentIndex];
@@ -184,12 +184,13 @@ class AudioService extends ChangeNotifier {
           title: metadata.title.isNotEmpty ? metadata.title : song.title,
           artist: metadata.artist.isNotEmpty ? metadata.artist : song.artist,
           url: song.url,
-          artwork: metadata.artwork,
-          // ⭐ 如果需要传递 artwork，可以在这里添加字段
+          artwork: metadata.artwork, // ✅ 已有
         );
         _queue[_currentIndex] = updatedSong;
         _currentSong = updatedSong;
         notifyListeners();
+
+        // ⭐ 传递完整的 updatedSong（包含 artwork）
         _onSongChanged?.call(updatedSong);
       }
     } catch (e) {
@@ -197,7 +198,70 @@ class AudioService extends ChangeNotifier {
     }
   }
 
-  // ---- 下一首 ----
+  /// 清除当前歌曲的缓存（metadata + 封面图 + 文件缓存），并强制重新播放
+  Future<void> clearCurrentSongCache() async {
+    if (_currentSong == null) return;
+    final song = _currentSong!;
+    final url = song.url ?? '';
+    if (url.isEmpty) return;
+
+    debugPrint('🗑️ [AudioService] clearing cache for: ${song.title}');
+
+    // 1. 获取当前索引
+    final currentIndex = _currentIndex;
+
+    // 2. 尝试获取文件信息生成 song_key
+    String songKey;
+    try {
+      final provider = MetadataService().getProviderForUrl(url);
+      final file = await provider.getFile(url);
+      if (file != null && await file.exists()) {
+        final stat = await file.stat();
+        songKey = _generateSongKey(
+            url, stat.size, stat.modified.millisecondsSinceEpoch);
+      } else {
+        songKey = url.hashCode.toString();
+      }
+    } catch (e) {
+      songKey = url.hashCode.toString();
+    }
+
+    // 3. 清除 SQLite 记录
+    final db = SongDatabase();
+    await db.deleteSong(songKey);
+    await db.deleteCache(songKey);
+    debugPrint('🗑️ [AudioService] SQLite records deleted: $songKey');
+
+    // 4. 删除封面图
+    await ArtworkHelper.deleteArtwork(songKey);
+    debugPrint('🗑️ [AudioService] artwork deleted');
+
+    // 5. 删除 metadata 临时缓存文件
+    try {
+      final cacheDir = await getTemporaryDirectory();
+      final cachePath = '${cacheDir.path}/metadata_${url.hashCode}.tmp';
+      final cacheFile = File(cachePath);
+      if (await cacheFile.exists()) {
+        await cacheFile.delete();
+        debugPrint('🗑️ [AudioService] temp cache file deleted');
+      }
+    } catch (e) {
+      // 忽略
+    }
+
+    // 6. 清除内存缓存
+    await MetadataService().clearCache(song.id);
+    debugPrint('🗑️ [AudioService] memory cache cleared');
+
+    // 7. 停止并重新播放
+    if (currentIndex >= 0 && currentIndex < _queue.length) {
+      stopPlay();
+      // 确保重新播放同一首歌
+      _playCurrent();
+      debugPrint('🔄 [AudioService] song reloaded');
+    }
+  }
+
   void next() {
     if (_queue.isEmpty) return;
 
@@ -215,7 +279,6 @@ class AudioService extends ChangeNotifier {
     _playCurrent();
   }
 
-  // ---- 上一首 ----
   void previous() {
     if (_queue.isEmpty) return;
 
@@ -241,7 +304,6 @@ class AudioService extends ChangeNotifier {
     _playCurrent();
   }
 
-  // ---- 播放/暂停 ----
   void togglePlay() {
     if (_currentSong == null) return;
 
@@ -252,7 +314,6 @@ class AudioService extends ChangeNotifier {
     }
   }
 
-  // ---- 停止播放 ----
   void stopPlay() {
     _currentSong = null;
     _isPlaying = false;
@@ -263,19 +324,16 @@ class AudioService extends ChangeNotifier {
     notifyListeners();
   }
 
-  // ---- 跳转 ----
   void seekTo(Duration position) {
     _isUserSeeking = true;
     PlaybackService().seek(position);
     positionNotifier.value = position;
 
-    // 800ms 后重置标志（覆盖 media_kit 的 positionStream 推送窗口）
     Future.delayed(const Duration(milliseconds: 800), () {
       _isUserSeeking = false;
     });
   }
 
-  // ---- 清空队列 ----
   void clearQueue() {
     _queue.clear();
     _currentIndex = -1;
@@ -285,7 +343,6 @@ class AudioService extends ChangeNotifier {
     notifyListeners();
   }
 
-  // ---- 主动状态同步（供 PlayerPage 调用） ----
   void syncPlayerStateNow() {
     final player = PlaybackService().player;
     final pos = player.state.position;
@@ -306,7 +363,6 @@ class AudioService extends ChangeNotifier {
     }
   }
 
-  // ---- 延迟同步（兜底） ----
   void _syncPlayerStateDelayed() {
     syncPlayerStateNow();
     Future.delayed(const Duration(milliseconds: 200), () {
@@ -317,7 +373,6 @@ class AudioService extends ChangeNotifier {
     });
   }
 
-  // ---- 监听 media_kit 状态 ----
   void _startListening() {
     if (_listening) return;
     _listening = true;
@@ -335,7 +390,6 @@ class AudioService extends ChangeNotifier {
 
     _subscriptions.add(
       player.stream.position.listen((position) {
-        // ⭐ 如果是用户主动 seek，忽略这次推送（避免覆盖）
         if (_isUserSeeking) {
           debugPrint('🎯 [AudioService] positionStream ignored: user seeking');
           return;
@@ -374,7 +428,6 @@ class AudioService extends ChangeNotifier {
     _subscriptions.clear();
   }
 
-  // ---- 防重入的完成事件处理 ----
   void _onPlaybackCompleted() {
     if (_handlingCompletion) {
       debugPrint('⚠️ [service] completed ignored: already handling');