tiku/tiku-client/lib/widgets/problem_card.dart

import 'package:flutter/material.dart';
import '../models/problem.dart';

/// 题目列表卡片
class ProblemCard extends StatelessWidget {
  final Problem problem;
  final bool isSelected;
  final bool isInCart;
  final VoidCallback onTap;
  final ValueChanged<String> onAddToCart;
  final ValueChanged<String>? onRemoveFromCart;

  const ProblemCard({
    super.key,
    required this.problem,
    this.isSelected = false,
    this.isInCart = false,
    required this.onTap,
    required this.onAddToCart,
    this.onRemoveFromCart,
  });

  @override
  Widget build(BuildContext context) {
    return Card(
      margin: const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
      color: isSelected ? Theme.of(context).colorScheme.primaryContainer : null,
      child: ListTile(
        dense: true,
        leading: _typeIcon(),
        title: Text(
          '${problem.questionType} · ${problem.difficultyLabel}(${problem.difficulty})',
          style: const TextStyle(fontSize: 13),
        ),
        subtitle: Text(
          'ID: ${problem.id}',
          style: TextStyle(fontSize: 11, color: Colors.grey.shade600),
        ),
        trailing: Row(
          mainAxisSize: MainAxisSize.min,
          children: [
            if (!problem.isAnnotated)
              const Icon(Icons.warning_amber, size: 16, color: Colors.orange),
            if (isInCart)
              IconButton(
                icon: const Icon(Icons.remove_shopping_cart, size: 18, color: Colors.red),
                onPressed: () => onRemoveFromCart?.call(problem.id),
                tooltip: '从试题篮移除',
              )
            else
              IconButton(
                icon: const Icon(Icons.add_shopping_cart, size: 18),
                onPressed: () => onAddToCart(problem.id),
                tooltip: '加入试题篮',
              ),
          ],
        ),
        onTap: onTap,
      ),
    );
  }

  Widget _typeIcon() {
    IconData icon;
    Color color;
    switch (problem.questionType) {
      case '单选题':
        icon = Icons.radio_button_checked;
        color = Colors.blue;
        break;
      case '多选题':
        icon = Icons.check_box;
        color = Colors.purple;
        break;
      case '填空题':
        icon = Icons.edit_note;
        color = Colors.orange;
        break;
      case '解答题':
        icon = Icons.assignment;
        color = Colors.green;
        break;
      default:
        icon = Icons.question_mark;
        color = Colors.grey;
    }
    return Icon(icon, color: color, size: 20);
  }
}