import 'dart:async';

import 'package:audio_session/audio_session.dart';
import 'package:hgdj/hj_page/short_video/view/video_player_base_logic.dart';
import 'package:hgdj/tools_base/debug_log.dart';
import 'package:hgdj/tools_base/event_bus/event_bus_util.dart';
import 'package:hgdj/tools_base/event_bus/events.dart';

/// 监听音频环境变化，自动暂停所有视频播放，防止音频通过手机外放泄露隐私：
/// 1. 耳机 / 蓝牙断开（音频切回外放）
/// 2. 来电、微信通话等其他 App 抢占音频（中断）
class HeadphoneMonitor {
  HeadphoneMonitor._();
  static final HeadphoneMonitor instance = HeadphoneMonitor._();

  /// 断开后会导致音频切回外放的「私密」输出设备类型（移除时需暂停）
  static const _privateOutputTypes = {
    AudioDeviceType.bluetoothA2dp,
    AudioDeviceType.bluetoothSco,
    AudioDeviceType.wiredHeadset,
    AudioDeviceType.wiredHeadphones,
    AudioDeviceType.usbAudio,
  };

  bool _started = false;
  StreamSubscription? _noisySub;
  StreamSubscription? _interruptSub;
  StreamSubscription? _deviceSub;

  Future<void> start() async {
    if (_started) return;
    _started = true;
    try {
      final session = await AudioSession.instance;
      await session.configure(const AudioSessionConfiguration.music());
      // 耳机拔出 / 蓝牙断开（音频切回外放）
      _noisySub = session.becomingNoisyEventStream.listen((_) {
        debugLog('耳机断开 → 自动暂停所有播放');
        pauseAll();
      });
      // 兜底：部分机型(华为/荣耀等)蓝牙断开不发 becomingNoisy 广播，改用更底层的设备移除回调兜底
      _deviceSub = session.devicesChangedEventStream.listen((event) {
        final unplugged = event.devicesRemoved
            .any((d) => d.isOutput && _privateOutputTypes.contains(d.type));
        if (unplugged) {
          debugLog('音频输出设备移除(蓝牙/耳机) → 自动暂停所有播放');
          pauseAll();
        }
      });
      // 来电 / 微信通话等抢占音频（中断）→ 暂停；duck（短促提示音降音量）不处理
      _interruptSub = session.interruptionEventStream.listen((event) {
        if (event.begin && event.type != AudioInterruptionType.duck) {
          debugLog('音频被打断(来电/通话等) → 自动暂停所有播放');
          pauseAll();
        }
      });
    } catch (e) {
      _started = false;
      debugLog('HeadphoneMonitor.start error: $e');
    }
  }

  /// 暂停所有正在播放的视频（长视频/直播/简单播放器/短视频列表）
  void pauseAll() {
    // 长视频详情页 / 直播 / 简单播放器（统一走 eventBus）
    eventBus.emit(PauseVideoEvent());
    // 短视频列表页
    VideoPlayerBaseLogic.pauseAll();
  }

  void dispose() {
    _noisySub?.cancel();
    _noisySub = null;
    _interruptSub?.cancel();
    _interruptSub = null;
    _deviceSub?.cancel();
    _deviceSub = null;
    _started = false;
  }
}