import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:pmu/components/debounce.dart';
import 'package:pmu/domain/models/card.dart';
import 'package:pmu/presentation/detail_pages/card_detail_page.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';

part 'card.dart';

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

  @override
  State<HomePage> createState() => _HomePageState();
}

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

class _Body extends StatefulWidget {
  const _Body();

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

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

  @override
  void initState() {
    WidgetsBinding.instance.addPostFrameCallback((_) {
      context.read<HomeBloc>().add(const HomeLoadDataEvent());
    });

    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,
          nextPageNumber: bloc.state.data?.nextPageNumber,
        ));
      }
    }
  }

  @override
  void dispose() {
    searchController.dispose();
    scrollController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: EdgeInsets.only(top: MediaQuery.of(context).padding.top),
      child: Column(
        children: [
          Padding(
            padding: const EdgeInsets.all(12),
            child: CupertinoSearchTextField(
              controller: searchController,
              onChanged: (search) {
                Debounce.run(() => context
                    .read<HomeBloc>()
                    .add(HomeLoadDataEvent(search: search)));
              },
            ),
          ),
          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()
                    : 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: (title, isLiked) => _showSnackBar(
                                          context, title, isLiked),
                                      onTap: () => _navToDetails(context, data),
                                    )
                                  : const SizedBox.shrink();
                            },
                          ),
                        ),
                      ),
          ),
          BlocBuilder<HomeBloc, HomeState>(
            builder: (context, state) => state.isPaginationLoading
                ? const CircularProgressIndicator()
                : const SizedBox.shrink(),
          ),
        ],
      ),
    );
  }

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

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

  void _showSnackBar(BuildContext context, String title, bool isLiked) {
    WidgetsBinding.instance.addPostFrameCallback((_) {
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(
        content: Text(
          '${isLiked ? 'Вы поставили лайк: ' : 'Вы убрали лайк: '} $title',
          style: const TextStyle(
              color: Colors.black45, fontSize: 20, fontWeight: FontWeight.bold),
        ),
        backgroundColor: isLiked ? Colors.green : Colors.red,
        duration: const Duration(seconds: 2),
      ));
    });
  }
}

//
// @override
// Widget build(BuildContext context) {
//   final data = ApiRepository().loadData();
//   return Center(
//     child: FutureBuilder<List<CardData>?>(
//       future: data,
//       builder: (context, snapshot) => SingleChildScrollView(
//         child: snapshot.hasData
//             ? Column(
//             mainAxisAlignment: MainAxisAlignment.center,
//             children: snapshot.data
//                 ?.map((data) => CardPost.fromData(data,
//                 onLike: (String title, bool isLiked) =>
//                     _showSnackBar(context, title, isLiked),
//                 onTap: () => _navToDetails(context, data)))
//                 .toList() ??
//                 [])
//             : const CircularProgressIndicator(),
//       ),
//     ),
//   );
// }