// lib/audio/playback_state_manager.dart
import 'package:audio_service/audio_service.dart' as audio_service;

class PlaybackStateManager {
  static final PlaybackStateManager _instance =
      PlaybackStateManager._internal();
  factory PlaybackStateManager() => _instance;
  PlaybackStateManager._internal();

  bool _playing = false;
  bool get playing => _playing;

  Duration _position = Duration.zero;
  Duration get position => _position;

  Duration _duration = Duration.zero;
  Duration get duration => _duration;

  // ⭐ 核心改动：使用 playPause 替代 play/pause 分离
  audio_service.PlaybackState get playbackState {
    // ⭐ 固定使用 playPause，不再动态切换
    final playControl = audio_service.MediaControl(
      androidIcon: _playing ? 'drawable/ic_pause' : 'drawable/ic_play',
      label: _playing ? '暂停' : '播放',
      action: audio_service.MediaAction.playPause, // 固定
    );

    final controls = [
      audio_service.MediaControl(
        androidIcon: 'drawable/ic_previous',
        label: '上一曲',
        action: audio_service.MediaAction.skipToPrevious,
      ),
      playControl,
      audio_service.MediaControl(
        androidIcon: 'drawable/ic_next',
        label: '下一曲',
        action: audio_service.MediaAction.skipToNext,
      ),
    ];

    return audio_service.PlaybackState(
      controls: controls,
      processingState: audio_service.AudioProcessingState.ready,
      playing: _playing, // ⭐ 这里才是真正的播放状态，通知栏会根据它显示正确的图标
      androidCompactActionIndices: const [0, 1, 2],
      updateTime: DateTime.now(),
      //extras: {'_refresh': DateTime.now().millisecondsSinceEpoch},
    );
  }

  // ---- 状态更新方法保持不变 ----
  void updatePlaying(bool playing) {
    if (_playing != playing) {
      _playing = playing;
    }
  }

  void updatePosition(Duration position) {
    _position = position;
  }

  void updateDuration(Duration duration) {
    _duration = duration;
  }

  void reset() {
    _playing = false;
    _position = Duration.zero;
    _duration = Duration.zero;
  }
}