import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:pmu/components/extensions/context_x.dart';
import 'package:pmu/components/utils/debounce.dart';
import 'package:pmu/data/repositories/bbc_repository.dart';
import 'package:pmu/data/repositories/mock_repository.dart';
import 'package:pmu/domain/models/card.dart';
import 'package:pmu/presentation/common/svg_objects.dart';
import 'package:pmu/presentation/details_page/details_page.dart';
import 'package:pmu/presentation/dialogs/show_dialog.dart';
import 'package:pmu/presentation/home_page/bloc/bloc.dart';
import 'package:pmu/presentation/home_page/bloc/events.dart';
import 'package:pmu/presentation/home_page/bloc/state.dart';
import 'package:pmu/presentation/likes_bloc/likes_bloc.dart';
import 'package:pmu/presentation/likes_bloc/likes_events.dart';
import 'package:pmu/presentation/likes_bloc/likes_state.dart';
import 'package:pmu/presentation/locale_bloc/locale_bloc.dart';
import 'package:pmu/presentation/locale_bloc/locale_events.dart';
import 'package:pmu/presentation/locale_bloc/locale_state.dart';

part 'card.dart';

class MyHomePage extends StatefulWidget {
  //const MyHomePage({super.key, required this.title});

  //final String title;
  const MyHomePage({super.key});

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return const Scaffold(
      body: _Body(),
    );
  }
}

class _Body extends StatefulWidget {
  const _Body({super.key});

  @override
  State<_Body> createState() => _BodyState();
}

class _BodyState extends State<_Body> {
  final searchController = TextEditingController();
  final scrollController = ScrollController();

  // late Future<List<CardData>?> data;
  // final repo = BbcRepository();
  @override
  void initState() {
    SvgObjects.init();
    WidgetsBinding.instance.addPostFrameCallback((_) {
      context.read<HomeBloc>().add(const HomeLoadDataEvent());
      context.read<LikeBloc>().add(const LoadLikesEvent());
    });
    //data = repo.loadData(onError: (e) => showErrorDialog(context, error: e));
    scrollController.addListener(_onNextPageListener);
    super.initState();
  }

  void _onNextPageListener() {
    if (scrollController.offset > scrollController.position.maxScrollExtent) {
      // preventing multiple pagination request on multiple swipes
      final bloc = context.read<HomeBloc>();
      if (!bloc.state.isPaginationLoading) {
        bloc.add(HomeLoadDataEvent(
          search: searchController.text,
          nextPage: 2,
        ));
      }
    }
  }

  void dispose() {
    searchController.dispose();
    scrollController.dispose();
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    //final data = BbcRepository().loadData();
    return Padding(
      padding: EdgeInsets.only(top: MediaQuery.of(context).padding.top),
      child: Column(children: [
        Row(
          children: [
            Expanded(
              flex: 4,
              child: Padding(
                padding: const EdgeInsets.all(12),
                child: CupertinoSearchTextField(
                  controller: searchController,
                  placeholder: context.locale.search,
                  onChanged: (search) {
                    Debounce.run(() => context
                        .read<HomeBloc>()
                        .add(HomeLoadDataEvent(search: search)));
                  },
                ),
              ),
            ),
            GestureDetector(
              onTap: () =>
                  context.read<LocaleBloc>().add(const ChangeLocaleEvent()),
              child: SizedBox.square(
                dimension: 50,
                child: Padding(
                  padding: const EdgeInsets.only(right: 12),
                  child: BlocBuilder<LocaleBloc, LocaleState>(
                    builder: (context, state) {
                      return state.currentLocale.languageCode == 'ru'
                          ? const SvgRu()
                          : const SvgUk();
                    },
                  ),
                ),
              ),
            ),
          ],
        ),
        BlocBuilder<HomeBloc, HomeState>(
          builder: (context, state) => state.error != null
              ? Text(
                  state.error ?? '',
                  style: Theme.of(context)
                      .textTheme
                      .headlineSmall
                      ?.copyWith(color: Colors.red),
                )
              : state.isLoading
                  ? const CircularProgressIndicator()
                  : BlocBuilder<LikeBloc, LikeState>(
                      builder: (context, likeState) {
                        return Expanded(
                          child: RefreshIndicator(
                            onRefresh: _onRefresh,
                            child: ListView.builder(
                              controller: scrollController,
                              padding: EdgeInsets.zero,
                              itemCount: state.data?.data?.length ?? 0,
                              itemBuilder: (context, index) {
                                final data = state.data?.data?[index];
                                return data != null
                                    ? _Card.fromData(
                                        data,
                                        onLike: _onLike,
                                        isLiked: likeState.likedIds
                                                ?.contains(data.id) ==
                                            true,
                                        onTap: () =>
                                            _navToDetails(context, data),
                                      )
                                    : const SizedBox.shrink();
                              },
                            ),
                          ),
                        );
                      },
                    ),
        ),
        BlocBuilder<HomeBloc, HomeState>(
          builder: (context, state) => state.isPaginationLoading
              ? const CircularProgressIndicator()
              : const SizedBox.shrink(),
        ),
      ]),
    );
  }

  void _showSnackBar(BuildContext context, String title, bool isLiked) {
    WidgetsBinding.instance.addPostFrameCallback((_) {
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(
        content: Text(
          'The New  ${isLiked ? context.locale.liked : context.locale.disliked}',
          style: Theme.of(context).textTheme.bodyLarge,
        ),
        backgroundColor: Colors.lightBlue,
        duration: const Duration(seconds: 1),
      ));
    });
  }

  void _navToDetails(BuildContext context, CardData data) {
    Navigator.push(
      context,
      CupertinoPageRoute(builder: (context) => DetailsPage(data)),
    );
  }

  void _onLike(String? id, String title, bool isLiked) {
    if (id != null) {
      context.read<LikeBloc>().add(ChangeLikeEvent(id));
      _showSnackBar(context, title, !isLiked);
    }
  }


  Future<void> _onRefresh() {
    context
        .read<HomeBloc>()
        .add(HomeLoadDataEvent(search: searchController.text));
    return Future.value(null);
  }
}