japp_flutter/lib/features/challenge/views/challenge_list_screen.dart

// challenge_list_screen.dart
import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:japp_flutter/core/models/challenge_model.dart';
import 'package:japp_flutter/features/challenge/view_models/challenge_list_vm.dart';
import 'package:japp_flutter/features/challenge/views/widgets/challenge_card.dart';

class ChallengeListScreen extends ConsumerWidget {
  const ChallengeListScreen({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final challengesState = ref.watch(challengeListProvider);

    return Scaffold(
      appBar: AppBar(
        title: const Text('挑战列表'),
        actions: [
          IconButton(
            icon: const Icon(Icons.refresh),
            onPressed: () => ref.read(challengeListProvider.notifier).refresh(),
          ),
        ],
      ),
      body: _buildBody(challengesState, ref),
      floatingActionButton: FloatingActionButton(
        onPressed: () => Navigator.pushNamed(context, '/challenge/add'),
        child: const Icon(Icons.add),
      ),
    );
  }

  Widget _buildBody(AsyncValue<List<ChallengeModel>> state, WidgetRef ref) {
    return state.when(
      loading: () => const Center(child: CircularProgressIndicator()),
      error: (error, stack) => Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            const Icon(Icons.error, color: Colors.red, size: 48),
            const SizedBox(height: 16),
            Text('加载失败: $error', style: const TextStyle(color: Colors.red)),
            const SizedBox(height: 16),
            ElevatedButton(
              onPressed: () =>
                  ref.read(challengeListProvider.notifier).refresh(),
              child: const Text('重试'),
            ),
          ],
        ),
      ),
      data: (challenges) => challenges.isEmpty
          ? const Center(child: Text('暂无挑战', style: TextStyle(fontSize: 18)))
          : RefreshIndicator(
              onRefresh: () =>
                  ref.read(challengeListProvider.notifier).refresh(),
              child: ListView.builder(
                padding: const EdgeInsets.all(16),
                itemCount: challenges.length,
                itemBuilder: (_, index) => ChallengeCard(challenge: challenges[index]),
                
                // itemBuilder: (context, index) => ListTile(
                //   title: Text(challenges[index].title),
                //   // 其他列表项内容
                // ),


              ),
            ),
    );
  }
}