import 'dart:async';
import 'dart:collection';
import 'package:aitrainer_app/model/cache.dart';
import 'package:aitrainer_app/model/exercise_ability.dart';
import 'package:aitrainer_app/model/workout_menu_tree.dart';
import 'package:aitrainer_app/repository/exercise_device_repository.dart';
import 'package:aitrainer_app/repository/exercise_repository.dart';
import 'package:aitrainer_app/repository/workout_tree_repository.dart';
import 'package:aitrainer_app/service/logging.dart';
import 'package:aitrainer_app/util/trans.dart';
import 'package:bloc/bloc.dart';
import 'package:equatable/equatable.dart';
import 'package:flutter/cupertino.dart';
import 'package:aitrainer_app/library/image_cache.dart' as wt;

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

class MenuBloc extends Bloc<MenuEvent, MenuState> with Trans, Logging {
  final WorkoutTreeRepository menuTreeRepository;
  final ExerciseRepository exerciseRepository = ExerciseRepository();
  ExerciseDeviceRepository exerciseDeviceRepository = ExerciseDeviceRepository();
  int parent = 0;
  WorkoutMenuTree? workoutItem;
  final List<int> listFilterDevice = [];

  int missingParent = 0;
  String? missingTreeName = "";

  late BuildContext context;

  ExerciseAbility? ability;

  MenuBloc({required this.menuTreeRepository}) : super(MenuInitial()) {
    parent = 0;
    on<MenuCreate>(_onCreate);
    on<MenuRecreateTree>(_onRecreateTree);
    on<MenuTreeDown>(_onTreeDown);
    on<MenuTreeUp>(_onTreeUp);
    on<MenuTreeJump>(_onTreeJump);
    on<MenuFilterExerciseType>(_onFilterExercise);
  }

  void _onCreate(MenuCreate event, Emitter<MenuState> emit) {
    emit(MenuLoading());
    if (Cache().getDevices() != null) {
      exerciseDeviceRepository.setDevices(Cache().getDevices()!);
    }
    emit(MenuReady());
  }

  void _onRecreateTree(MenuRecreateTree event, Emitter<MenuState> emit) {
    emit(MenuLoading());
    // ie. at language changes
    menuTreeRepository.createTree();
    emit(MenuReady());
  }

  Future<void> _onTreeDown(MenuTreeDown event, Emitter<MenuState> emit) async {
    emit(MenuLoading());
    parent = event.parent;
    workoutItem = event.item;

    if (workoutItem != null) {
      setAbility(workoutItem!.internalName);
    }
    final LinkedHashMap<String, WorkoutMenuTree> branch = menuTreeRepository.getBranch(event.parent);

    await getImages(branch);
    emit(MenuReady());
  }

  Future<void> _onTreeUp(MenuTreeUp event, Emitter<MenuState> emit) async {
    emit(MenuLoading());
    // get parent menus or exercises
    parent = event.parent;
    workoutItem = menuTreeRepository.getParentItem(parent);

    LinkedHashMap<String, WorkoutMenuTree> branch;
    if (workoutItem != null) {
      setAbility(workoutItem!.internalName);
      branch = menuTreeRepository.getBranch(workoutItem!.parent);
      await getImages(branch);
    }
    emit(MenuReady());
  }

  Future<void> _onTreeJump(MenuTreeJump event, Emitter<MenuState> emit) async {
    emit(MenuLoading());
    parent = event.parent;
    workoutItem = menuTreeRepository.getParentItem(parent);

    if (workoutItem != null) {
      setAbility(workoutItem!.internalName);
    }
    final LinkedHashMap<String, WorkoutMenuTree> branch = menuTreeRepository.getBranch(workoutItem!.parent);
    await getImages(branch);
    emit(MenuReady());
  }

  Future<void> _onFilterExercise(MenuFilterExerciseType event, Emitter<MenuState> emit) async {
    emit(MenuLoading());
    final int deviceId = event.deviceId;
    if (selectedDevice(deviceId)) {
      listFilterDevice.add(deviceId);
    } else {
      listFilterDevice.remove(deviceId);
    }
    emit(MenuReady());
  }

  void setContext(BuildContext context) {
    this.context = context;
  }

  void setAbility(String name) {
    switch (name) {
      case "one_rep_max":
        ability = ExerciseAbility.oneRepMax;
        break;
      case "cardio":
        ability = ExerciseAbility.running;
        break;
      case "test_center":
        ability = ExerciseAbility.mini_test_set;
        break;
      case "training_plans":
        ability = ExerciseAbility.training;
        break;
      case "my_body":
        ability = ExerciseAbility.none;
        break;
      case "training_execute":
        ability = ExerciseAbility.training_execute;
        break;
    }
    log("Ability: " + ability.toString() + " name: " + name);
  }

  Future<void> getImages(LinkedHashMap<String, WorkoutMenuTree> branch) async {
    wt.ImageCache().clearImageList();
    await putBranchImageToHash(branch);
    log("downloaded image size in KB: " + wt.ImageCache().downloadSize.toString());
  }

  Future<void> putBranchImageToHash(LinkedHashMap<String, WorkoutMenuTree> branch) async {
    await Future.forEach(branch.keys, (key) async {
      final WorkoutMenuTree? value = branch[key];
      if (value != null && !value.imageName.contains("asset")) {
        await wt.ImageCache().putImageToList(value.id, value.imageName);
      }
    });
  }

  String? getImage(int id, String name) {
    String? imageString;
    if (name.contains("http")) {
      imageString = wt.ImageCache().getImageString(id, name);
    }
    return imageString;
  }

  bool selectedDevice(int deviceId) {
    return !listFilterDevice.contains(deviceId);
  }

  LinkedHashMap<String, WorkoutMenuTree> getFilteredBranch(int? parent) {
    if (parent == null) return LinkedHashMap();

    LinkedHashMap<String, WorkoutMenuTree> branch = menuTreeRepository.getBranch(parent);
    if (!menuTreeRepository.isChild(parent) || ability.toString() == ExerciseAbility.none.toString() || listFilterDevice.isEmpty) {
      return branch;
    }
    LinkedHashMap<String, WorkoutMenuTree> filtered = LinkedHashMap();

    branch.forEach((key, value) {
      final WorkoutMenuTree elem = value;
      if (elem.exerciseType != null) {
        for (int i = 0; i < elem.exerciseType!.devices.length; i++) {
          if (listFilterDevice.contains(elem.exerciseType!.devices[i])) {
            filtered[elem.name] = elem;
          }
        }
      }
    });
    return filtered;
  }
}