import 'dart:async';

import 'package:aitrainer_app/model/workout_tree.dart';
import 'package:aitrainer_app/repository/menu_tree_repository.dart';
import 'package:bloc/bloc.dart';
import 'package:equatable/equatable.dart';
import 'package:meta/meta.dart';

part 'menu_event.dart';
part 'menu_state.dart';

class MenuBloc extends Bloc<MenuEvent, MenuState> {
  final MenuTreeRepository menuTreeRepository;
  int parent;

  MenuBloc({this.menuTreeRepository}) : super(MenuInitial()) {
    parent = 0;
  }

  @override
  Stream<MenuState> mapEventToState(
    MenuEvent event,
  ) async* {
    try {
      if ( event is MenuCreate ) {
        yield MenuLoading();
        await menuTreeRepository.createTree();
        yield MenuReady();
      } else if (event is MenuTreeDown) {
        // get child menus or exercises
        yield MenuLoading();
        parent = event.parent;
        menuTreeRepository.getBranch(event.parent);
        yield MenuReady();
      } else if (event is MenuTreeUp) {
        yield MenuLoading();
        // get parent menus or exercises
        parent = event.parent;
        menuTreeRepository.getBranch(parent);

        yield MenuReady();
      } else if (event is MenuClickExercise) {
        yield MenuLoading();
        // get exercise page
        yield MenuReady();
      }
    } on Exception catch(ex) {
      yield MenuError(message: ex.toString());
    }
  }
}