import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Bug',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Sliver MainAxis Group Bug'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final List<_Group> groupedItems = [
    _Group(name: 'Owned', items: List.generate(4, (_) => _MyItem())),
    _Group(name: 'Wishlist', items: List.generate(5, (_) => _MyItem())),
    _Group(name: 'Recently Played', items: List.generate(3, (_) => _MyItem())),
    _Group(name: 'Recently Added', items: List.generate(4, (_) => _MyItem())),
    _Group(name: 'Recently Updated', items: List.generate(6, (_) => _MyItem())),
    _Group(name: 'Recently Played', items: List.generate(2, (_) => _MyItem())),
  ];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.blue,
        title: Text(widget.title),
      ),
      body: CustomScrollView(
        slivers: [
          const SliverPadding(padding: EdgeInsets.only(top: 4)),
          for (final group in groupedItems)
            SliverMainAxisGroup(
              key: ValueKey(group),
              slivers: [
                PinnedHeaderSliver(
                  child: _MyHeaderListItem(group: group.name),
                ),
                SliverPrototypeExtentList.builder(
                  // Prevents the sliverList items from being kept in memory when they are not visible.
                  addAutomaticKeepAlives: false,
                  prototypeItem: _MyItem(),
                  itemBuilder: (context, index) => _MyItem(),
                  itemCount: group.items.length,
                ),
              ],
            )
        ],
      ),
    );
  }
}

class _Group {
  final String name;
  final List<dynamic> items;
  _Group({required this.name, required this.items});
}

class _MyHeaderListItem extends StatelessWidget {
  const _MyHeaderListItem({required this.group});
  final String group;

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.all(12),
      child: Container(
        decoration: BoxDecoration(
          gradient: const LinearGradient(colors: [Colors.blueGrey, Colors.lightBlue]),
          borderRadius: BorderRadius.circular(20),
        ),
        padding: const EdgeInsets.symmetric(vertical: 8, horizontal: 16),
        child: Text(group, style: const TextStyle(color: Colors.white, fontWeight: FontWeight.bold)),
      ),
    );
  }
}

class _MyItem extends StatelessWidget {
  const _MyItem();

  @override
  Widget build(BuildContext context) {
    return Container(
      margin: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
      padding: const EdgeInsets.all(8),
      decoration: BoxDecoration(
        color: Colors.blueGrey[300],
        borderRadius: BorderRadius.circular(12),
        boxShadow: [BoxShadow(color: Colors.black12, blurRadius: 4, offset: const Offset(0, 2))],
      ),
      child: InkWell(
        onTap: () => {},
        child: Row(
          children: [
            Container(
              width: 60,
              height: 90,
              decoration: BoxDecoration(
                color: Colors.blue,
                borderRadius: BorderRadius.circular(8),
              ),
            ),
            const SizedBox(width: 8),
            Expanded(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text('🎏 Lorem ipsum dolor', maxLines: 1, overflow: TextOverflow.ellipsis),
                  const SizedBox(height: 4),
                  Text('Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.',
                      maxLines: 2, overflow: TextOverflow.ellipsis, style: TextStyle(color: Colors.black54)),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }
}