japp_flutter/lib/features/challenge/views/edit_challenge_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_edit_vm.dart';

class ChallengeEditScreen extends ConsumerWidget {
  final ChallengeModel? initialChallenge;

  const ChallengeEditScreen({
    super.key,
    this.initialChallenge,
  });

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final challengeState = ref.watch(challengeEditProvider);
    final theme = Theme.of(context);

    return Scaffold(
      appBar: AppBar(
        title: Text(initialChallenge == null ? '创建挑战' : '编辑挑战'),
        actions: [
          IconButton(
            icon: const Icon(Icons.save),
            onPressed: () async {
              await ref.read(challengeEditProvider.notifier).saveChallenge();
              if (context.mounted) Navigator.pop(context);
            },
          ),
        ],
      ),
      body: challengeState.when(
        loading: () => const Center(child: CircularProgressIndicator()),
        error: (error, _) => Center(child: Text('错误: $error')),
        data: (challenge) {
          if (challenge == null) {
            return const Center(child: Text('未初始化数据'));
          }

          return SingleChildScrollView(
            padding: const EdgeInsets.all(16),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                _buildTitleField(challenge, ref),
                const SizedBox(height: 24),
                _buildDifficultySelector(challenge, ref),
                const SizedBox(height: 24),
                _buildDescriptionField(challenge, ref),
              ],
            ),
          );
        },
      ),
    );
  }

  Widget _buildTitleField(ChallengeModel challenge, WidgetRef ref) {
    return TextFormField(
      initialValue: challenge.title,
      decoration: const InputDecoration(
        labelText: '挑战标题',
        border: OutlineInputBorder(),
      ),
      onChanged: (value) => ref.read(challengeEditProvider.notifier).updateTitle(value),
    );
  }

  Widget _buildDescriptionField(ChallengeModel challenge, WidgetRef ref) {
    return TextFormField(
      initialValue: challenge.description,
      decoration: const InputDecoration(
        labelText: '挑战描述',
        border: OutlineInputBorder(),
        alignLabelWithHint: true,
      ),
      maxLines: 5,
      onChanged: (value) => ref.read(challengeEditProvider.notifier).updateDescription(value),
    );
  }

  Widget _buildDifficultySelector(ChallengeModel challenge, WidgetRef ref) {
    const difficulties = ['简单', '中等', '困难'];
    
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Text('难度级别', style: TextStyle(fontSize: 16)),
        const SizedBox(height: 8),
        Wrap(
          spacing: 8,
          children: difficulties.map((level) {
            return ChoiceChip(
              label: Text(level),
              selected: challenge.difficulty == level,
              onSelected: (selected) {
                if (selected) {
                  ref.read(challengeEditProvider.notifier).updateDifficulty(level);
                }
              },
            );
          }).toList(),
        ),
      ],
    );
  }
}