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 '../currency_bloc/currency_bloc.dart';
import '../currency_bloc/currency_events.dart';
import '../currency_bloc/currency_state.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();
  late String? currencyId;

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

    WidgetsBinding.instance.addPostFrameCallback((_) {
      context.read<CurrencyBloc>().add(const LoadLocalCurrencyEvent());
      context.read<FavouritesBloc>().add(const LoadFavouritesEvent());
    });

    super.initState();
  }

  @override
  void dispose() {
    searchController.dispose();

    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return BlocListener<CurrencyBloc, CurrencyState>(
      listener: (context, state) {
        if (state.hasCurrencyLoaded && state.currencyId != null) {
          currencyId = state.currencyId;
          context.read<HomeBloc>().add(HomeLoadDataEvent(
            locale: context.locale,
            currencyId: currencyId!,
          ));
        }
      },
      child: 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,
                    currencyId: currencyId!,
                  )));
                },
                leading: const Icon(Icons.search),
                trailing: [
                  IconButton(
                    icon: const Icon(Icons.close),
                    onPressed: () {
                      if (searchController.text.isNotEmpty) {
                        FocusManager.instance.primaryFocus?.unfocus();
                        searchController.clear();
                        context.read<HomeBloc>().add(HomeLoadDataEvent(
                          locale: context.locale,
                          currencyId: currencyId!,
                        ));
                      }
                    },
                  ),
                ],
                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,
      currencyId: currencyId!,
    ));
    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) {
    FocusManager.instance.primaryFocus?.unfocus();
    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,
        currencyId: currencyId!,
      ));
    }
  }
}