eatvio_app/lib/features/feed/presentation/pages/feed_screen.dart

import 'package:eatvio_app/features/feed/presentation/bloc/feed_cubit/feed_cubit.dart';
import 'package:eatvio_app/features/feed/presentation/bloc/feed_cubit/feed_state.dart';
import 'package:eatvio_app/features/feed/presentation/bloc/recipes_cubit/recipes_cubit.dart';
import 'package:eatvio_app/features/feed/presentation/bloc/recipes_cubit/recipes_state.dart';
import 'package:eatvio_app/features/feed/presentation/widgets/blog_post_widget.dart';
import 'package:eatvio_app/features/feed/presentation/widgets/recipes_widget.dart';
import 'package:eatvio_app/theme/theme_helper.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:go_router/go_router.dart';

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

  @override
  State<FeedScreen> createState() => _FeedScreenState();
}

class _FeedScreenState extends State<FeedScreen> {
  final List<String> chipsLabelList = ['Все', 'Рецепты', 'Диеты', 'Планы питания', 'Консультанты'];

  int _selectedChipIndex = 0;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.white,
        toolbarHeight: 0,
      ),
      backgroundColor: Colors.grey.shade200,
      body: NestedScrollView(
        headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
          return [
            SliverAppBar(
              shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.vertical(bottom: Radius.circular(12)),
              ),
              backgroundColor: Colors.white,
              foregroundColor: Colors.white,
              automaticallyImplyLeading: false,
              stretchTriggerOffset: 1,
              floating: true,
              snap: true,
              scrolledUnderElevation: 0,
              bottom: _chipGroup(),
              title: Row(
                children: [
                  _searchBar(),
                  SizedBox(width: 12),
                  _addBlogPostButton(),
                ],
              ),
            ),
          ];
        },
        body: Builder(
          builder: (BuildContext context) {
            if (_selectedChipIndex == 0)
              return _buildAllBlogPosts();
            else
              return _buildAllRecipes();
          },
        ),
      ),
    );
  }

  _buildAllBlogPosts() {
    return RefreshIndicator(
      onRefresh: () => context.read<FeedCubit>().loadFeedBlogPostList(),
      child: BlocBuilder<FeedCubit, FeedState>(
        builder: (BuildContext context, FeedState state) {
          if (state is FeedStateLoaded) {
            return ListView.separated(
              padding: EdgeInsets.symmetric(vertical: 8),
              shrinkWrap: true,
              physics: BouncingScrollPhysics(),
              itemBuilder: (context, index) {
                return BlogPostWidget(feedBlogPostModel: state.feedBlogPostList[index]);
              },
              separatorBuilder: (context, index) {
                return SizedBox(height: 8);
              },
              itemCount: state.feedBlogPostList.length,
            );
          } else if (state is FeedStateError) {
            return Scaffold(
              body: Padding(
                padding: const EdgeInsets.all(16),
                child: Center(
                  child: Text(state.errorMessage),
                ),
              ),
            );
          } else {
            return Scaffold(
              body: Center(
                child: CupertinoActivityIndicator(),
              ),
            );
          }
        },
      ),
    );
  }

  _buildAllRecipes() {
    return RefreshIndicator(
      onRefresh: () => context.read<RecipesCubit>().loadRecipesList(),
      child: BlocBuilder<RecipesCubit, RecipesState>(
        builder: (BuildContext context, RecipesState state) {
          if (state is RecipesStateLoaded) {
            return ListView.separated(
              padding: EdgeInsets.symmetric(vertical: 8),
              shrinkWrap: true,
              physics: BouncingScrollPhysics(),
              itemBuilder: (context, index) {
                return RecipesWidget(recipes: state.recipesList[index]);
              },
              separatorBuilder: (context, index) {
                return SizedBox(height: 8);
              },
              itemCount: state.recipesList.length,
            );
          } else if (state is RecipesStateError) {
            return Scaffold(
              body: Padding(
                padding: const EdgeInsets.all(16),
                child: Center(
                  child: Text(state.errorMessage),
                ),
              ),
            );
          } else {
            return Scaffold(
              body: Center(
                child: CupertinoActivityIndicator(),
              ),
            );
          }
        },
      ),
    );
  }

  _chipGroup() {
    return PreferredSize(
      preferredSize: Size(MediaQuery.of(context).size.width, 32),
      child: Align(
        alignment: Alignment.centerLeft,
        child: SingleChildScrollView(
          padding: EdgeInsets.symmetric(horizontal: 16),
          scrollDirection: Axis.horizontal,
          child: Row(
            children: [
              _choiceChipWidget(0),
              SizedBox(width: 8),
              _choiceChipWidget(1),
              SizedBox(width: 8),
              _choiceChipWidget(2),
              SizedBox(width: 8),
              _choiceChipWidget(3),
              SizedBox(width: 8),
              _choiceChipWidget(4),
            ],
          ),
        ),
      ),
    );
  }

  _addBlogPostButton() {
    return InkWell(
      onTap: () => GoRouter.of(context).pushNamed('blogPostCreateScreen'),
      borderRadius: BorderRadius.circular(64),
      child: Ink(
        decoration: BoxDecoration(
          color: appTheme.blueA400,
          shape: BoxShape.circle,
        ),
        child: Icon(
          Icons.add_rounded,
          color: appTheme.gray100,
        ),
        width: 40,
        height: 40,
      ),
    );
  }

  _searchBar() {
    return SizedBox(
      height: 40,
      width: MediaQuery.of(context).size.width - 84,
      child: TextFormField(
        style: TextStyle(
          fontSize: 12,
        ),
        decoration: InputDecoration(
          hintText: 'Поиск',
          hintStyle: TextStyle(
            fontSize: 12,
            color: appTheme.gray600,
            fontWeight: FontWeight.w400,
          ),
          prefixIcon: Icon(
            Icons.search,
            color: appTheme.gray600,
            size: 16,
          ),
          isDense: false,
          contentPadding: EdgeInsets.all(8),
          fillColor: appTheme.gray100,
          filled: true,
          border: OutlineInputBorder(
            borderRadius: BorderRadius.circular(16),
            borderSide: BorderSide.none,
          ),
          enabledBorder: OutlineInputBorder(
            borderRadius: BorderRadius.circular(16),
            borderSide: BorderSide.none,
          ),
          focusedBorder: OutlineInputBorder(
            borderRadius: BorderRadius.circular(16),
            borderSide: BorderSide.none,
          ),
        ),
      ),
    );
  }

  _choiceChipWidget(int index) {
    return ChoiceChip(
      selectedColor: appTheme.blueA400,
      pressElevation: 0,
      showCheckmark: false,
      side: BorderSide.none,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(16),
      ),
      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
      label: Text(chipsLabelList[index]),
      labelStyle: TextStyle(
        color: index == _selectedChipIndex ? Colors.white : appTheme.gray600,
        fontWeight: FontWeight.w500,
        fontSize: 12,
      ),
      selected: _selectedChipIndex == index,
      backgroundColor: appTheme.gray100,
      onSelected: (bool selected) {
        setState(() {
          _selectedChipIndex = index;
        });
      },
    );
  }
}