PMD_Kouvshinoff_PIbd_31/lib/presentation/home_page/home_page.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:laba1/components/extensions/context_x.dart';
import 'package:laba1/data/repositories/potter_repository.dart';
import 'package:laba1/presentation/details_page/details_page.dart';
import 'package:laba1/presentation/header.dart';

import '../../components/utils/debounce.dart';
import '../../data/repositories/mock_repository.dart';
import '../../domain/models/card.dart';
import '../comon/svg_objects.dart';
import '../dialogs/show_dialog.dart';
import '../like_bloc/like_bloc.dart';
import '../like_bloc/like_event.dart';
import '../like_bloc/like_state.dart';
import '../locale_bloc/locale_bloc.dart';
import '../locale_bloc/locale_events.dart';
import '../locale_bloc/locale_state.dart';
import 'bloc/bloc.dart';
import 'bloc/events.dart';
import 'bloc/state.dart';

part 'card.dart';

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

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text(widget.title),
          backgroundColor: Colors.amber,
        ),
        backgroundColor: Colors.yellow,
        body: const _Body());
  }
}

class _Body extends StatefulWidget {
  const _Body({Key? key}) : super(key: key);

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

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

  @override
  void initState() {
    SvgObjects.init();
    WidgetsBinding.instance.addPostFrameCallback((_) {
      context.read<HomeBloc>().add(const HomeLoadDataEvent());
      context.read<LikeBloc>().add(const LoadLikesEvent());
    });
    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: bloc.state.data?.nextPage,
        ));
      }
    }
  }

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

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Stack(
        children: [
          BlocBuilder<HomeBloc, HomeState>(
            builder: (context, state) => state.error != null
                ? Text(
                    state.error ?? '',
                    style: Theme.of(context)
                        .textTheme
                        .headlineSmall
                        ?.copyWith(color: Colors.red),
                  )
                : state.isLoading
                    ? Center(child: CircularProgressIndicator())
                    : RefreshIndicator(
                        onRefresh: _onRefresh,
                        child: ListView.builder(
                          controller: scrollController,
                          padding: EdgeInsets.zero,
                          itemCount: (state.data?.data?.length ?? 0) + 1,
                          itemBuilder: (context, index) {
                            if (index == 0) {
                              return SizedBox(height: 40);
                            }
                            final data = state.data?.data?[index - 1];
                            return data != null
                                ? BlocBuilder<LikeBloc, LikeState>(
                                    builder: (context, likeState) {
                                    return _Card.fromData(
                                      data,
                                      onLike: _onLike,
                                      isLiked: likeState.likedIds
                                              ?.contains(data.id) ==
                                          true,
                                      onTap: () => _navToDetails(context, data),
                                    );
                                  })
                                : const SizedBox.expand();
                          },
                        ),
                      ),
          ),
          Align(
              alignment: Alignment.topCenter,
              child: Header(
                searchController: searchController,
                placeholder: context.locale.search,
                onChanged: (search) {
                  Debounce.run(() => context
                      .read<HomeBloc>()
                      .add(HomeLoadDataEvent(search: search)));
                },
              )),
          Align(
            alignment: Alignment.bottomCenter,
            child: Padding(
              padding: const EdgeInsets.all(8.0),
              child: SizedBox(
                height: 50,
                width: 50,
                child: BlocBuilder<HomeBloc, HomeState>(
                  builder: (context, state) => state.isPaginationLoading
                      ? const CircularProgressIndicator()
                      : const SizedBox.shrink(),
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }

  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);
  }

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

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