import 'package:eatvio_app/core/utils/pagination_utils.dart';
import 'package:eatvio_app/core/widgets/data_error_widget.dart';
import 'package:eatvio_app/core/widgets/loader.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/pages/feed_screen.dart';
import 'package:eatvio_app/features/feed/presentation/widgets/blog_post_widget.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:visibility_detector/visibility_detector.dart';

class BlogPosts extends StatelessWidget {
  const BlogPosts({super.key, required this.handleVisibility});
  final Function({required double visibleFraction,required int id, required ViewableContentType type}) handleVisibility;
  
  @override
  Widget build(BuildContext context) {
    return RefreshIndicator(
      onRefresh: () => context.read<FeedCubit>().loadFeedBlogPostList(),
      child: BlocBuilder<FeedCubit, FeedState>(
        builder: (BuildContext context, FeedState state) {
          if (state is FeedStateLoaded) {
            return NotificationListener<ScrollNotification>(
              onNotification: (notification) {
                loadNewContent(notification, context.read<FeedCubit>().loadNextPage);
                return false;
              },
              child: ListView.separated(
                padding: const EdgeInsets.symmetric(vertical: 8),
                physics: const BouncingScrollPhysics(),
                itemBuilder: (context, index) {
                  if (index == state.feedBlogPostList.length) {
                    return const Loader();
                  }
                  return VisibilityDetector(
                    onVisibilityChanged: (info) {
                      final id = state.feedBlogPostList[index].id;
                      handleVisibility(visibleFraction: info.visibleFraction, id: id, type: ViewableContentType.posts);
                    },
                    key: ValueKey(index),
                    child: BlogPostWidget(index: index),
                  );
                },
                separatorBuilder: (context, index) => const SizedBox(height: 8),
                itemCount: state.isLoading ? state.feedBlogPostList.length + 1 : state.feedBlogPostList.length,
              ),
            );
          } else if (state is FeedStateError) {
            return DataErrorWidget(onReload: () => context.read<FeedCubit>().loadFeedBlogPostList());
          } else {
            return Scaffold(backgroundColor: Colors.grey.shade200, body: const Loader());
          }
        },
      ),
    );
  }
}