// lib/services/audio_player_handler.dart

import 'package:flutter/foundation.dart';
import 'package:audio_service/audio_service.dart' as audio_service;
import '../audio/player_controller.dart';
import '../audio/playback_state_manager.dart';
import '../services/audio_service.dart'; // 你自己的业务 AudioService

class AudioPlayerHandler extends audio_service.BaseAudioHandler {
  final PlayerController _player = PlayerController();
  final PlaybackStateManager _state = PlaybackStateManager();

  AudioPlayerHandler() {
    // ---- 监听播放状态变化，同步到通知栏 ----
    _player.playingStream.listen((playing) {
      _state.updatePlaying(playing);
      _publishState();
    });

    _player.positionStream.listen((position) {
      _state.updatePosition(position);
      final current = playbackState.value;
      playbackState.add(audio_service.PlaybackState(
        controls: current.controls,
        processingState: current.processingState,
        playing: current.playing,
        androidCompactActionIndices: current.androidCompactActionIndices,
        updateTime: DateTime.now(),
      ));
    });

    _player.durationStream.listen((duration) {
      _state.updateDuration(duration);
      _publishState();
    });

    // ⭐ 已删除 completed 监听，交由 AudioService 统一处理
    // _player.completedStream.listen((_) { ... });
  }

  void _publishState() {
    playbackState.add(_state.playbackState);
  }

  void updateNotification({
    required String id,
    required String title,
    required String artist,
  }) {
    debugPrint('📢 [handler] updateNotification: $title');
    mediaItem.add(audio_service.MediaItem(
      id: id,
      title: title,
      artist: artist,
      duration: _player.duration,
    ));
  }

  // ---- 系统控制命令 ----
  @override
  Future<void> play() async {
    debugPrint('▶️ [handler] play() called');
    _player.play();
  }

  @override
  Future<void> pause() async {
    debugPrint('⏸️ [handler] pause() called');
    _player.pause();
  }

  @override
  Future<void> stop() async {
    debugPrint('⏹️ [handler] stop() called');
    _player.stop();
  }

  @override
  Future<void> seek(Duration position) async {
    debugPrint('⏩ [handler] seek() called: $position');
    _player.seek(position);
  }

  @override
  Future<void> skipToNext() async {
    debugPrint('⏭️ [handler] skipToNext() called');
    AudioService().next();
  }

  @override
  Future<void> skipToPrevious() async {
    debugPrint('⏮️ [handler] skipToPrevious() called');
    AudioService().previous();
  }

  @override
  Future<void> click(
      [audio_service.MediaButton button =
          audio_service.MediaButton.media]) async {
    debugPrint('🎯 [handler] click() called with button: ${button.name}');
    switch (button) {
      case audio_service.MediaButton.next:
        await skipToNext();
        break;
      case audio_service.MediaButton.previous:
        await skipToPrevious();
        break;
      case audio_service.MediaButton.media:
        if (_player.isPlaying) {
          await pause();
        } else {
          await play();
        }
        break;
      default:
        // 其他按钮 fallback
        if (_player.isPlaying) {
          await pause();
        } else {
          await play();
        }
    }
  }
}