PIbd-32_Shabunov_O.A._MobileProgramming/lib/presentation/home_page/home_page.dart

import 'package:flutter/material.dart';
import 'package:flutter_android_app/components/extensions/context_x.dart';
import 'package:flutter_android_app/components/utils/debounce.dart';
import 'package:flutter_android_app/domain/models/card.dart';
import 'package:flutter_android_app/presentation/details_page/details_page.dart';
import 'package:flutter_android_app/presentation/favourites_page/favourites_page.dart';
import 'package:flutter_android_app/presentation/home_page/bloc/bloc.dart';
import 'package:flutter_android_app/presentation/home_page/bloc/events.dart';
import 'package:flutter_android_app/presentation/home_page/bloc/state.dart';
import 'package:flutter_android_app/presentation/home_page/cards_list.dart';
import 'package:flutter_bloc/flutter_bloc.dart';

import '../common/svg_objects.dart';
import '../favourites_bloc/favourites_bloc.dart';
import '../favourites_bloc/favourites_events.dart';
import '../settings_page/settings_page.dart';

class MainScaffold extends StatefulWidget {
  const MainScaffold({
    super.key,
    this.toggleDarkMode,
    required this.isDarkModeSelected,
  });

  final void Function()? toggleDarkMode;
  final bool isDarkModeSelected;

  @override
  State<MainScaffold> createState() => _MainScaffoldState();
}

class _MainScaffoldState extends State<MainScaffold> {
  int currentPageIndex = 0;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: [
          Text(context.locale.mainAppBarTitle),
          Text(context.locale.favouritesPageAppBarTitle),
          Text(context.locale.settingsPageAppBarTitle),
        ][currentPageIndex],
        actions: [
          Padding(
            padding: const EdgeInsets.only(right: 12.0),
            child: IconButton(
              isSelected: widget.isDarkModeSelected,
              onPressed: () => widget.toggleDarkMode?.call(),
              icon: const Icon(Icons.wb_sunny_outlined),
              selectedIcon: const Icon(Icons.brightness_2_outlined),
            ),
          ),
        ],
      ),
      bottomNavigationBar: NavigationBar(
        destinations: [
          NavigationDestination(icon: const Icon(Icons.home), label: context.locale.navigationHome),
          NavigationDestination(icon: const Icon(Icons.favorite), label: context.locale.navigationFavourites),
          NavigationDestination(icon: const Icon(Icons.settings), label: context.locale.navigationSettings),
        ],
        selectedIndex: currentPageIndex,
        onDestinationSelected: (int index) => setState(() {
          currentPageIndex = index;
        }),
      ),
      body: [
        const HomePage(),
        const FavouritesPage(),
        const SettingsPage(),
      ][currentPageIndex],
    );
  }
}

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

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

class _HomePageState extends State<HomePage> {
  final TextEditingController searchController = TextEditingController();

  @override
  void initState() {
    SvgObjects.init();

    WidgetsBinding.instance.addPostFrameCallback((_) {
      context.read<HomeBloc>().add(HomeLoadDataEvent(locale: context.locale));
      context.read<FavouritesBloc>().add(const LoadFavouritesEvent());
    });

    super.initState();
  }

  @override
  void dispose() {
    searchController.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: SearchBar(
              controller: searchController,
              onChanged: (search) {
                Debounce.run(() => context.read<HomeBloc>().add(HomeLoadDataEvent(search: search, locale: context.locale)));
              },
              leading: const Icon(Icons.search),
              trailing: [
                IconButton(
                  icon: const Icon(Icons.close),
                  onPressed: () {
                    if (searchController.text.isNotEmpty) {
                      searchController.clear();
                      context.read<HomeBloc>().add(HomeLoadDataEvent(locale: context.locale));
                    }
                  },
                ),
              ],
              hintText: context.locale.searchHint,
              elevation: const WidgetStatePropertyAll(0.0),
              padding: const WidgetStatePropertyAll(EdgeInsets.only(left: 18, right: 10)),
              backgroundColor: WidgetStatePropertyAll(Theme.of(context).colorScheme.secondaryContainer),
            ),
          ),
          CardsList(
            onListRefresh: _onRefresh,
            onCardLiked: _onLike,
            onCardTapped: _navToDetails,
            onNextPage: _onNextPage,
          ),
          BlocBuilder<HomeBloc, HomeState>(
            builder: (context, state) => state.isPaginationLoading
                ? const Padding(
                  padding: EdgeInsets.all(12),
                  child: CircularProgressIndicator(),
                )
                : const SizedBox.shrink(),
          ),
        ],
      )
    );
  }

  void _showSnackBar(BuildContext context, String title, bool isLiked) {
    WidgetsBinding.instance.addPostFrameCallback((_) {
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(
        content: Text(
          '$title ${isLiked ? context.locale.addedToFavourite : context.locale.removedFromFavourite}',
          style: Theme.of(context).textTheme.bodyLarge
        ),
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        duration: const Duration(seconds: 2),
      ));
    });
  }

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

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

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

  void _onNextPage() {
    final bloc = context.read<HomeBloc>();
    if (!bloc.state.isPaginationLoading && !bloc.state.isAllPagesLoaded) {
      bloc.add(HomeLoadDataEvent(
        search: searchController.text,
        nextPage: bloc.state.data?.nextPage,
        locale: context.locale,
      ));
    }
  }
}