Remever/lib/screens/collections/collections_screen.dart

import 'package:auto_route/auto_route.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:get_it_mixin/get_it_mixin.dart';
import 'package:remever/common/resources.dart';
import 'package:remever/common/widgets/typography.dart';
import 'package:remever/components/extensions/context.dart';
import 'package:remever/components/notifiers/home_screen_data.dart';
import 'package:remever/database/database.dart';
import 'package:remever/database/tables.dart';
import 'package:remever/inject.dart';
import 'package:remever/router.gr.dart';
import 'package:remever/screens/collections/cubit/collection_cubit.dart';
import 'package:remever/screens/collections/widgets/collection_card.dart';
import 'package:remever/screens/collections/widgets/collections_app_bar.dart';
import 'package:remever/screens/collections/widgets/collections_filters.dart';

@RoutePage()
class CollectionScreen extends StatelessWidget with GetItMixin {
  CollectionScreen({super.key});

  /// Флаг что надо показывать Fab
  bool get _showFab {
    return watchOnly<CollectionData, bool>((CollectionData d) => d.showFAB);
  }

  @override
  Widget build(BuildContext context) {
    return BlocProvider<CollectionCubit>(
      create: (context) => CollectionCubit(),
      child: Scaffold(
        backgroundColor: AppColors.bg,
        appBar: const CollectionsAppBar(),
        body: _buildMain(context),
        floatingActionButton: Builder(
          builder: (BuildContext context) {
            return AnimatedOpacity(
              opacity: _showFab ? 1.0 : 0.0,
              duration: const Duration(milliseconds: 200),
              child: FloatingActionButton(
                backgroundColor: AppColors.primary,
                onPressed: () {
                  context.pushRoute(CrudCollectionRoute());
                },
                // context.read<HomeCubit>().toCrudCollection(CrudType.CREATE),
                child: const Icon(Icons.add),
              ),
            );
          },
        ),
      ),
    );
  }

  ///
  /// Построение основго экрана
  ///
  Widget _buildMain(BuildContext context) {
    return BlocBuilder<CollectionCubit, CollectionState>(
      builder: (context, state) {
        return Column(
          children: [
            CollectionsFilters(),
            state.when(
              loading: () => _LoadingList(),
              data: () => _CollectionList(),
              empty: () => _EmptyList(),
              error: () => _ErrorList(),
            ),
          ],
        );
      },
    );
  }
}

class _LoadingList extends StatelessWidget {
  const _LoadingList();

  @override
  Widget build(BuildContext context) {
    return SizedBox(
      height: MediaQuery.sizeOf(context).height / 2,
      child: Center(child: CircularProgressIndicator(color: AppColors.primary)),
    );
  }
}

class _ErrorList extends StatelessWidget {
  const _ErrorList();

  @override
  Widget build(BuildContext context) {
    return SizedBox(
      height: MediaQuery.sizeOf(context).height / 2,
      child: Center(
        child: AppTypography('Произошла ошибка при загрузке данных'),
      ),
    );
  }
}

class _EmptyList extends StatelessWidget {
  const _EmptyList();

  @override
  Widget build(BuildContext context) {
    return SizedBox(
      height: MediaQuery.sizeOf(context).height / 2,
      child: Center(child: AppTypography('Нет доступных коллекций')),
    );
  }
}

class _CollectionList extends StatelessWidget {
  const _CollectionList();

  // @override
  @override
  Widget build(BuildContext context) {
    print('build _CollectionList');
    final CollectionCubit collectionCubit = context.read<CollectionCubit>();
    collectionCubit.initScrollListener();

    return Expanded(
      child: StreamBuilder(
        stream: getIt<AppDatabase>().collectionsDao.getCollections(),
        builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.waiting) {
            return Center(
              child: CircularProgressIndicator(color: AppColors.primary),
            );
          }

          if (snapshot.connectionState == ConnectionState.active ||
              snapshot.connectionState == ConnectionState.done) {
            if (snapshot.hasError) {
              return _ErrorList();
            }

            if (snapshot.data == null || snapshot.data!.isEmpty) {
              return _EmptyList();
            }

            return ListView.builder(
              controller: collectionCubit.collectionController,
              itemCount: snapshot.data!.length,
              padding: const EdgeInsets.symmetric(horizontal: 16).r,
              itemBuilder:
                  (BuildContext context, int index) => Padding(
                    padding: const EdgeInsets.only(bottom: 8).r,
                    child: const CollectionCard(),
                  ),
            );
          }

          return Center(
            child: CircularProgressIndicator(color: AppColors.primary),
          );
        },
      ),
    );
  }
}