liangchengyou / wow_english

  import 'package:flutter/cupertino.dart';

  import 'package:flutter/foundation.dart';

  import 'package:flutter_bloc/flutter_bloc.dart';

  import 'package:wow_english/common/request/dao/lesson_dao.dart';

  import 'package:wow_english/common/request/exception.dart';

  import 'package:wow_english/common/request/dao/listen_dao.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 '../../../models/course_section_entity.dart';
  import '../../../models/course_unit_entity.dart';

  import '../../../utils/list_ext.dart';

  part 'section_event.dart';
  part 'section_state.dart';

  class SectionBloc extends Bloc<SectionEvent, SectionState> {

    PageController _pageController;
  
    PageController get pageController => _pageController;
  
    ///当前页索引
    int _currentPage = 0;
  
    int get currentPage => _currentPage;
  
    ScrollController _listController;
  
    ScrollController get listController => _listController;
  

    CourseUnitEntity _courseUnitEntity;
  
    CourseUnitEntity get courseUnitEntity => _courseUnitEntity;
  
    CourseUnitDetail _courseUnitDetail;
  
    CourseUnitDetail get courseUnitDetail => _courseUnitDetail;
  
    List<CourseSectionEntity>? _courseSectionDatas;
  
    List<CourseSectionEntity>? get courseSectionDatas => _courseSectionDatas;

    CourseProcessEntity? _processEntity;
  
    CourseProcessEntity? get processEntity => _processEntity;
  

    SectionBloc(this._courseUnitEntity, this._courseUnitDetail, this._pageController, this._listController) : super(LessonInitial()) {

      on<RequestDataEvent>(_requestData);

      on<RequestExitClassEvent>(_requestExitClass);

      on<RequestEndClassEvent>(_requestEndClass);

      on<RequestEnterClassEvent>(_requestEnterClass);

      on<RequestVideoLessonEvent>(_requestVideoLesson);

      on<CurrentUnitIndexChangeEvent>(_pageControllerChange);

    }

    void _requestData(RequestDataEvent event, Emitter<SectionState> emitter) async {

      try {
        await loading(() async {

          _courseSectionDatas = await LessonDao.courseSection(courseUnitId: _courseUnitDetail.id!);
          emitter(LessonDataLoadState());

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

          showToast(e.message.toString());

        }
      }
    }

    void _requestVideoLesson(RequestVideoLessonEvent event, Emitter<SectionState> emitter) async {

      try {
        await loading(() async {
          _processEntity = await ListenDao.process(event.courseLessonId);

          emitter(RequestVideoLessonState(event.courseLessonId,event.courseType));

        });
      } catch (e) {
        if (e is ApiException) {
          showToast(e.message??'请求失败,请检查网络连接');
        }
      }
    }

    void _requestEnterClass(RequestEnterClassEvent event,Emitter<SectionState> emitter) async {

      try {
        await loading(() async {
           await ListenDao.enterClass(event.courseLessonId);
           emitter(RequestEnterClassState(event.courseLessonId,event.courseType));
        });
      } catch (e) {
        if (e is ApiException) {
          showToast(e.message??'请求失败,请检查网络连接');
        }
      }
    }
  

    void _requestExitClass(RequestExitClassEvent event,Emitter<SectionState> emitter) async {

      await ListenDao.exitClass(event.courseLessonId,event.currentStep);
    }
  
    void _requestEndClass(RequestEndClassEvent event,Emitter<SectionState> emitter) async {
      final obj = await ListenDao.endClass(event.courseLessonId,event.currentStep);
      if (event.autoNextSection) {
        final nextCourseSection = getNextCourseSectionBySort(int.parse(event.courseLessonId));
        ///进入课堂
        add(RequestEnterClassEvent(nextCourseSection!.id.toString() ?? '', nextCourseSection.courseType));
      }

    }

  
    void _pageControllerChange(CurrentUnitIndexChangeEvent event,
        Emitter<SectionState> emitter) async {
      _currentPage = event.unitIndex;
      emitter(CurrentPageIndexState());
    }
  
    // 未锁定的页数
    int unlockPageCount() {
      return _courseUnitEntity.courseUnitVOList?.indexWhereOrNull((element) => element.lock == true) ?? 1;
    }

  
    CourseSectionEntity? getNextCourseSectionBySort(int courseLessonId) {
      final curCourseSectionEntity = _courseSectionDatas?.firstWhere((element) => element.id == courseLessonId);
      final curSort = curCourseSectionEntity?.sortOrder ?? 0;
      CourseSectionEntity? nextCourseSectionEntity = _courseSectionDatas?.firstWhere((element) => element.sortOrder == curSort + 1);
      if (nextCourseSectionEntity != null) {
        return nextCourseSectionEntity;
      } else {
        ///跨unit选lesson
        final curCourseUnitDetail = _courseUnitEntity.courseUnitVOList?.firstWhere((element) => element.id == curCourseSectionEntity?.courseUnitId);
        if (curCourseUnitDetail != null) {
          final nextCourseUnitDetail = _courseUnitEntity.courseUnitVOList?.firstWhere((element) => element.sortOrder == 0);
          if (nextCourseUnitDetail != null) {
            ///pageView翻页了，可能需要预加载 todo
            return null;
          } else {
            ///最后一个unit了
            return null;
          }
        } else {
          ///找不到对应的unitDetail，理论上不可能
          return null;
        }
      }
    }

  }