liangchengyou / wow_english

  import 'package:audioplayers/audioplayers.dart';

  import 'package:flutter/cupertino.dart';

  import 'package:flutter/foundation.dart';
  import 'package:flutter/services.dart';

  import 'package:flutter_bloc/flutter_bloc.dart';

  import 'package:flutter_easyloading/flutter_easyloading.dart';

  import 'package:permission_handler/permission_handler.dart';

  import 'package:wow_english/common/extension/string_extension.dart';

  import 'package:wow_english/common/request/dao/listen_dao.dart';
  import 'package:wow_english/common/request/exception.dart';
  import 'package:wow_english/models/course_process_entity.dart';
  import 'package:wow_english/utils/loading.dart';

  import 'package:wow_english/utils/toast_util.dart';

  import '../../../common/permission/permissionRequestPage.dart';
  

  part 'topic_picture_event.dart';

  part 'topic_picture_state.dart';

  enum VoicePlayState {
    ///未知
    unKnow,
    ///播放中
    playing,
    ///播放完成
    completed,
    ///播放终止
    stop
  }
  

  class TopicPictureBloc extends Bloc<TopicPictureEvent, TopicPictureState> {

  
    final PageController pageController;
  

    final String courseLessonId;

  
    int _currentPage = 0;
  

    int _selectItem = -1;
  
    CourseProcessEntity? _entity;
  
    ///正在评测
    bool _isVoicing = false;
  

    ///正在播放音频
    VoicePlayState _voicePlayState = VoicePlayState.unKnow;
  

    // 是否是回答（选择）结果音效
    bool _isResultSoundPlaying = false;
  
    bool get isResultSoundPlaying => _isResultSoundPlaying;
  
    // 答对播放音效时禁止任何点击（选择）操作
    bool _forbiddenWhenCorrect = false;
  
    bool get forbiddenWhenCorrect => _forbiddenWhenCorrect;
  

    CourseProcessEntity? get entity => _entity;

  
    int get currentPage => _currentPage + 1;
  
    int get selectItem => _selectItem;
  

    bool get isVoicing => _isVoicing;
  

    VoicePlayState get voicePlayState  => _voicePlayState;
  

    late MethodChannel methodChannel;

    late AudioPlayer audioPlayer;

    final BuildContext context;
  
    TopicPictureBloc(this.context, this.pageController, this.courseLessonId) : super(TopicPictureInitial()) {

      on<CurrentPageIndexChangeEvent>(_pageControllerChange);

      on<VoicePlayStateChangeEvent>(_voicePlayStateChange);
      on<XSVoiceResultEvent>(_voiceXsResult);
      on<XSVoiceInitEvent>(_initVoiceSdk);

      on<SelectItemEvent>(_selectItemLoad);

      on<RequestDataEvent>(_requestData);
      on<XSVoiceTestEvent>(_voiceXsTest);

      on<XSVoiceStopEvent>(_voiceXsStop);

      on<VoicePlayEvent>(_questionVoicePlay);

      on<InitBlocEvent>((event, emit) {

        //音频播放器
        audioPlayer = AudioPlayer();

        audioPlayer.onPlayerStateChanged.listen((event) async {

          debugPrint('播放状态变化 _voicePlayState=$_voicePlayState event=$event _isResultSoundPlaying=$_isResultSoundPlaying _forbiddenWhenCorrect=$_forbiddenWhenCorrect');
          if (_isResultSoundPlaying) {
            if (event != PlayerState.playing) {
              _isResultSoundPlaying = false;
              if (_forbiddenWhenCorrect) {
                _forbiddenWhenCorrect = false;
                // 答对后自动翻页
                pageController.nextPage(
                  duration: const Duration(milliseconds: 500),
                  curve: Curves.ease,
                );
              }
            }
          } else {
            if (event == PlayerState.completed) {
              debugPrint('播放完成');
              _voicePlayState = VoicePlayState.completed;
            }
            if (event == PlayerState.stopped) {
              debugPrint('播放结束');
              _voicePlayState = VoicePlayState.stop;
            }

            if (event == PlayerState.playing) {
              debugPrint('正在播放中');
              _voicePlayState = VoicePlayState.playing;
            }
            if (isClosed) {
              return;
            }
            add(VoicePlayStateChangeEvent());

          }

        });
  

        methodChannel = const MethodChannel('wow_english/sing_sound_method_channel');

        methodChannel.setMethodCallHandler((call) async {

          if (call.method == 'voiceResult') {//评测结果

            add(XSVoiceResultEvent(call.arguments));

            return;
          }
  
          if (call.method == 'voiceStart') {//评测开始
            if (kDebugMode) {
              print('评测开始');
            }
            return;
          }
  
          if (call.method == 'voiceEnd') {//评测结束
            if (kDebugMode) {
              print('评测结束');
            }
            return;
          }
  
          if (call.method == 'voiceFail') {//评测失败
            EasyLoading.showToast('评测失败');
            return;

          }
        });

      });

    }
  
    @override

    Future<void> close(){

      pageController.dispose();

      audioPlayer.release();

      audioPlayer.dispose();

      _isResultSoundPlaying = false;
      _forbiddenWhenCorrect = false;

      _voiceXsCancel();

      return super.close();
    }
  

    ///请求数据

    void _requestData(RequestDataEvent event,Emitter<TopicPictureState> emitter) async {
      try {
        await loading(() async {

          _entity = await ListenDao.process(courseLessonId);

          emitter(RequestDataState());
        });
      } catch (e) {
        if (e is ApiException) {

          showToast(e.message??'请求失败,请检查网络连接');

        }
      }
    }
  

    ///页面切换

    void _pageControllerChange(CurrentPageIndexChangeEvent event,Emitter<TopicPictureState> emitter) async {

      await closePlayerResource();
      debugPrint('翻页 $_currentPage->${event.pageIndex}');
      if (_currentPage == _entity?.topics?.length) {
        return;

      }

      _currentPage = event.pageIndex;

      final topics = _entity?.topics?[_currentPage];

      if (topics?.type != 3 && topics?.type != 4) {

        if (topics?.audioUrl != null) {
          final urlStr = topics?.audioUrl??'';
          if (urlStr.isNotEmpty) {

            debugPrint(urlStr);
            await audioPlayer.play(UrlSource(urlStr));

          }
        }

      }

      _selectItem = -1;

      emitter(CurrentPageIndexState());
    }
  

    ///选择

    void _selectItemLoad(SelectItemEvent event,Emitter<TopicPictureState> emitter) async {

      if (_forbiddenWhenCorrect) {
        return;
      }

      _selectItem = event.selectIndex;

      CourseProcessTopics? topics = _entity?.topics?[_currentPage];
      CourseProcessTopicsTopicAnswerList? answerList = topics?.topicAnswerList?[_selectItem];
      if (answerList?.correct == 0) {

        _playResultSound(false);
        // showToast('继续加油哦',duration: const Duration(seconds: 2));

      } else {

        _playResultSound(true);
        // showToast('恭喜你,答对啦!',duration: const Duration(seconds: 2));

      }

      emitter(SelectItemChangeState());

    }

    ///初始化SDK
    _initVoiceSdk(XSVoiceInitEvent event,Emitter<TopicPictureState> emitter) async {
      methodChannel.invokeMethod('initVoiceSdk',event.data);
    }
  

    ///先声测试
    void _voiceXsTest(XSVoiceTestEvent event,Emitter<TopicPictureState> emitter) async {

      await audioPlayer.stop();

      // 调用封装好的权限检查和请求方法
      bool result = await permissionCheckAndRequest(
          context,
          Permission.microphone,
          "录音"

      );

      if (result) {
        methodChannel.invokeMethod(
            'startVoice',
            {
              'word': event.testWord,
              'type': event.type,
              'userId': event.userId.toString()
            }
        );
        _isVoicing = true;
        emitter(XSVoiceTestState());
      }

    }
  

    ///终止评测
    void _voiceXsStop(XSVoiceStopEvent event,Emitter<TopicPictureState> emitter) async {
      methodChannel.invokeMethod('stopVoice');
    }
  

    ///取消评测（用于处理退出页面后录音未停止等异常情况的保护操作）
    void _voiceXsCancel() {
      methodChannel.invokeMethod('cancelVoice');
    }
  

    ///先声评测结果

    void _voiceXsResult(XSVoiceResultEvent event,Emitter<TopicPictureState> emitter) async {
      final Map args = event.message as Map;

      final result = args['result'] as Map;
      final overall = result['overall'].toString();
      showToast('测评成功,分数是$overall',duration: const Duration(seconds: 5));

      _isVoicing = false;

      emitter(XSVoiceTestState());

    }

    // 暂时没用上

    void _voicePlayStateChange(VoicePlayStateChangeEvent event,Emitter<TopicPictureState> emitter) async {
      emitter(VoicePlayStateChange());
    }
  

    // 题目音频播放
    void _questionVoicePlay(VoicePlayEvent event,Emitter<TopicPictureState> emitter) async {
      if (_forbiddenWhenCorrect) {

        return;
      }

      _forbiddenWhenCorrect = false;
      await closePlayerResource();

      final topics = _entity?.topics?[_currentPage];
      final urlStr = topics?.audioUrl??'';
      await audioPlayer.play(UrlSource(urlStr));
    }

  
    Future<void> closePlayerResource() async {
      if (voicePlayState == VoicePlayState.playing || _isResultSoundPlaying) {
        await audioPlayer.stop();
      }
    }
  
    void _playResultSound(bool isCorrect) async {
      await audioPlayer.stop();
      _isResultSoundPlaying = true;
      _forbiddenWhenCorrect = isCorrect;
      if (isCorrect) {
        await audioPlayer.play(AssetSource('correct_voice'.assetMp3));
      } else {
        await audioPlayer.play(AssetSource('incorrect_voice'.assetMp3));
      }
    }

  }