VeloeKemonoPartyFlutter/lib/pages/media_carousel_screen

import 'package:flutter/material.dart';
import 'package:photo_view/photo_view.dart';
import '../models/post.dart';

class MediaCarouselItem {
  final String url;
  final String type; // 'image' or 'video'

  final int postIndex;
  final int attachmentIndex;

  MediaCarouselItem({
    required this.url,
    required this.type,
    required this.postIndex,
    required this.attachmentIndex,
  });
}

class MediaCarouselScreen extends StatefulWidget {
  final int initialIndex;
  final List<MediaCarouselItem> mediaItems;
  final Future<void> Function() loadMorePosts;
  final List<Post> allPosts;

  const MediaCarouselScreen({
    super.key,
    required this.initialIndex,
    required this.mediaItems,
    required this.loadMorePosts,
    required this.allPosts,
  });

  @override
  State<MediaCarouselScreen> createState() => _MediaCarouselScreenState();
}

class _MediaCarouselScreenState extends State<MediaCarouselScreen> {
  late PageController _pageController;
  late int _currentIndex;
  late List<MediaCarouselItem> _mediaItems;

  @override
  void initState() {
    super.initState();
    _currentIndex = widget.initialIndex;
    _mediaItems = widget.mediaItems;
    _pageController = PageController(initialPage: widget.initialIndex);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.black,
      body: Stack(
        children: [
          PageView.builder(
            controller: _pageController,
            itemCount: _mediaItems.length,
            onPageChanged: (index) {
              setState(() {
                _currentIndex = index;
              });
              // Check if we are near the end and load more
              if (index >= _mediaItems.length - 3) {
                _loadMoreIfNeeded();
              }
            },
            itemBuilder: (context, index) {
              final item = _mediaItems[index];
              if (item.type == 'image') {
                return PhotoView(
                  imageProvider: NetworkImage(item.url),
                  backgroundDecoration: const BoxDecoration(color: Colors.black),
                );
              } else {
                return VideoPlayerWidget(videoUrl: item.url);
              }
            },
          ),
          Positioned(
            top: 40,
            left: 20,
            child: IconButton(
              icon: const Icon(Icons.close, color: Colors.white),
              onPressed: () => Navigator.pop(context),
            ),
          ),
        ],
      ),
    );
  }

  Future<void> _loadMoreIfNeeded() async {
    if (_currentIndex >= _mediaItems.length - 3) {
      await widget.loadMorePosts();
      setState(() {
        _mediaItems = _compileMediaItems(widget.allPosts);
      });
    }
  }

  List<MediaCarouselItem> _compileMediaItems(List<Post> posts) {
    List<MediaCarouselItem> items = [];
    for (int i = 0; i < posts.length; i++) {
      final post = posts[i];
      for (int j = 0; j < post.attachments.length; j++) {
        final attachment = post.attachments[j];
        items.add(
          MediaCarouselItem(
            url: attachment.link,
            type: attachment.isImage ? "image" : "video",
            postIndex: i,
            attachmentIndex: j,
          ),
        );
      }
    }
    return items;
  }
}