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<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 _requestEndClass(
        RequestEndClassEvent event, Emitter<SectionState> emitter) async {
      if (event.isLastPage) {
        await await ListenDao.endClass(event.courseLessonId, event.currentStep,
            currentTime: event.currentTime);
      } else {
        await await ListenDao.exitClass(event.courseLessonId, event.currentStep,
            currentTime: event.currentTime);
      }
      debugPrint("WQF _requestEndClass autoNextSection=${event.autoNextSection}");

      if (event.autoNextSection) {

        final nextCourseSection =
            getNextCourseSectionBySort(int.parse(event.courseLessonId));
        debugPrint("WQF nextCourseSection = $nextCourseSection");

        ///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;
        }
      }
    }

  }