// lib/services/audio_player_handler.dart
import 'package:audio_service/audio_service.dart';
import 'playback_service.dart';
import 'audio_service.dart' as local_audio;

class AudioPlayerHandler extends BaseAudioHandler {
  final PlaybackService _playback = PlaybackService();
  late final local_audio.AudioService _localAudio;

  MediaItem? _currentMediaItem;

  AudioPlayerHandler() {
    _localAudio = local_audio.AudioService();

    // 1. 监听播放状态（只更新 playing）
    _playback.player.stream.playing.listen((playing) {
      playbackState.add(playbackState.value.copyWith(
        playing: playing,
      ));
    });

    // 2. ⭐ 进度更新：跳过，因为当前版本不支持 position 参数
    //    通知栏进度条不会动，但播放/暂停/切歌功能正常
    //    如果后续需要，可以升级 audio_service 版本或改用其他方案

    // 3. 监听播放完成（触发下一首）
    _playback.player.stream.completed.listen((_) {
      _localAudio.next();
    });

    // 4. 监听时长变化，更新 MediaItem
    _playback.player.stream.duration.listen((duration) {
      if (_currentMediaItem != null) {
        _currentMediaItem = _currentMediaItem!.copyWith(duration: duration);
        mediaItem.add(_currentMediaItem);
      }
    });
  }

  /// 外部调用更新通知栏
  void updateNotification({
    required String id,
    required String title,
    required String artist,
  }) {
    _currentMediaItem = MediaItem(
      id: id,
      title: title,
      artist: artist,
      duration: _playback.player.state.duration,
    );
    mediaItem.add(_currentMediaItem);
  }

  // ---- AudioHandler 接口实现 ----
  @override
  Future<void> play() async {
    _playback.resume();
  }

  @override
  Future<void> pause() async {
    _playback.pause();
  }

  @override
  Future<void> stop() async {
    _playback.stop();
  }

  @override
  Future<void> seek(Duration position) async {
    _playback.seek(position);
  }

  @override
  Future<void> skipToNext() async {
    _localAudio.next();
  }

  @override
  Future<void> skipToPrevious() async {
    _localAudio.previous();
  }

  @override
  Future<void> click([MediaButton button = MediaButton.media]) async {
    // 默认行为：打开 App
  }
}