import 'dart:async';

import 'package:bloc/bloc.dart';
import 'package:flutter/cupertino.dart';
import 'package:go_router/go_router.dart';
import 'package:hadi_hoda_flutter/core/constants/my_constants.dart';
import 'package:hadi_hoda_flutter/core/routers/my_routes.dart';
import 'package:hadi_hoda_flutter/core/utils/local_storage.dart';
import 'package:hadi_hoda_flutter/core/utils/my_context.dart';
import 'package:hadi_hoda_flutter/features/intro/presentation/bloc/intro_event.dart';
import 'package:hadi_hoda_flutter/features/intro/presentation/bloc/intro_state.dart';
import 'package:hadi_hoda_flutter/features/intro/presentation/ui/screens/intro_1_screen.dart';
import 'package:hadi_hoda_flutter/features/intro/presentation/ui/screens/intro_2_screen.dart';
import 'package:hadi_hoda_flutter/features/intro/presentation/ui/screens/intro_3_screen.dart';
import 'package:hadi_hoda_flutter/features/intro/presentation/ui/screens/intro_4_screen.dart';
import 'package:hadi_hoda_flutter/features/intro/presentation/ui/screens/intro_5_screen.dart';
import 'package:pod_player/pod_player.dart';

class IntroBloc extends Bloc<IntroEvent, IntroState> {
  /// ------------constructor------------
  IntroBloc() : super(const IntroState()) {
    initVideos();
    listenController();
    on<InitVideosEvent>(_initVideosEvent);
    on<ChangeVideosEvent>(_changeVideosEvent);
  }

  @override
  Future<void> close() {
    podController1.dispose();
    podController2.dispose();
    podController3.dispose();
    podController4.dispose();
    podController5.dispose();
    return super.close();
  }

  /// ------------UseCases------------

  /// ------------Variables------------
  final List<Widget> intros = const [
    Intro1Screen(key: Key('0')),
    Intro2Screen(key: Key('1')),
    Intro3Screen(key: Key('2')),
    Intro4Screen(key: Key('3')),
    Intro5Screen(key: Key('4')),
  ];

  /// ------------Controllers------------
  final PodPlayerController podController1 = PodPlayerController(
    playVideoFrom: PlayVideoFrom.asset('assets/videos/intro_1.mp4'),
  );
  final PodPlayerController podController2 = PodPlayerController(
    playVideoFrom: PlayVideoFrom.asset('assets/videos/intro_2.mp4'),
  );
  final PodPlayerController podController3 = PodPlayerController(
    playVideoFrom: PlayVideoFrom.asset('assets/videos/intro_3.mp4'),
  );
  final PodPlayerController podController4 = PodPlayerController(
    playVideoFrom: PlayVideoFrom.asset('assets/videos/intro_4.mp4'),
  );
  final PodPlayerController podController5 = PodPlayerController(
    playVideoFrom: PlayVideoFrom.asset('assets/videos/intro_5.mp4'),
  );

  /// ------------Functions------------
  Future<void> goToHomePage() async {
    await LocalStorage.saveData(key: MyConstants.firstIntro, value: 'true');
    if (MyContext.get.mounted) {
      MyContext.get.goNamed(Routes.homePage);
    }
  }

  void listenController() {
    // A helper function to check for video completion
    void _onVideoEnd(PodPlayerController controller, int controllerIndex) {
      final position = controller.videoPlayerValue?.position;
      final duration = controller.videoPlayerValue?.duration;

      if (position != null && duration != null && position >= duration) {
        // Only trigger the change if the completed video is the current one
        if (state.currentIntro == controllerIndex) {
          add(ChangeVideosEvent());
        }
      }
    }

    podController1.addListener(() => _onVideoEnd(podController1, 0));
    podController2.addListener(() => _onVideoEnd(podController2, 1));
    podController3.addListener(() => _onVideoEnd(podController3, 2));
    podController4.addListener(() => _onVideoEnd(podController4, 3));
    podController5.addListener(() => _onVideoEnd(podController5, 4));
  }

  /// ------------Api Calls------------
  FutureOr<void> _changeVideosEvent(ChangeVideosEvent event, Emitter emit) async {
    switch (state.currentIntro) {
      case 0:
        podController2.play();
        emit(state.copyWith(currentIntro: 1));
        break;
      case 1:
        podController3.play();
        emit(state.copyWith(currentIntro: 2));
        break;
      case 2:
        podController4.play();
        emit(state.copyWith(currentIntro: 3));
        break;
      case 3:
        podController5.play();
        emit(state.copyWith(currentIntro: 4));
        break;
      case 4:
        goToHomePage();
        break;
    }
  }

  Future<void> initVideos() async {
    await Future.wait([
      podController1.initialise(),
      podController2.initialise(),
      podController3.initialise(),
      podController4.initialise(),
      podController5.initialise(),
    ]);
    podController1.play();
    add(InitVideosEvent());
  }

  FutureOr<void> _initVideosEvent(
    InitVideosEvent event,
    Emitter<IntroState> emit,
  ) async {
    emit(state.copyWith(currentIntro: 0));
  }
}