problem_check_system/lib/modules/problem/controllers/problem_upload_controller.dart

// problem_upload_controller.dart
import 'package:get/get.dart';
import 'package:problem_check_system/data/models/problem_model.dart';
// import 'package:problem_check_system/services/problem_service.dart';

class ProblemUploadController extends GetxController {
  // 假设从数据库或其他来源获取问题列表
  final RxList<Problem> problems = <Problem>[].obs;

  // 用于存储用户选中的问题
  final RxList<Problem> selectedProblems = <Problem>[].obs;

  @override
  void onInit() {
    super.onInit();
    // 监听 problems 列表的变化，并在变化时更新 selectedProblems
    ever(problems, (_) => _updateSelectedList());
    // 监听 selectedProblems 列表，更新上传按钮状态
    ever(selectedProblems, (_) => _updateUploadButtonState());

    fetchProblems(); // 假设从数据源获取问题列表
  }

  void fetchProblems() async {
    // 模拟从服务中获取问题列表
    // final fetched = await ProblemService.getProblemsForUpload();
    // problems.assignAll(fetched);
  }

  // 监听所有问题的 isChecked 状态，更新 selectedProblems 列表
  void _updateSelectedList() {
    selectedProblems.clear();
    for (var problem in problems) {
      if (problem.isChecked.value) {
        selectedProblems.add(problem);
      }
    }
  }

  // 控制上传按钮是否可用
  RxBool isUploadEnabled = false.obs;
  void _updateUploadButtonState() {
    isUploadEnabled.value = selectedProblems.isNotEmpty;
  }

  // 控制全选/取消全选按钮的文案
  RxBool allSelected = false.obs;

  void selectAll() {
    final bool newState = !allSelected.value;
    for (var problem in problems) {
      problem.isChecked.value = newState;
    }
    allSelected.value = newState;
  }

  void uploadProblems() {
    if (selectedProblems.isEmpty) return;
    // 实际的上传逻辑，例如调用 API
    print('开始上传 ${selectedProblems.length} 个问题...');
    // 上传完成后，清空列表或更新状态
    selectedProblems.clear();
  }
}