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lib/models/concurrent_task.dart

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+import 'course.dart';
+
+/// Concurrent evaluation task status
+enum TaskStatus {
+  waiting, // 等待开始
+  preparing, // 准备评教（访问页面、解析问卷）
+  countdown, // 倒计时等待
+  submitting, // 提交中
+  verifying, // 验证中
+  completed, // 完成
+  failed, // 失败
+}
+
+/// Concurrent evaluation task
+class ConcurrentTask {
+  final int taskId;
+  final Course course;
+  TaskStatus status;
+  String? statusMessage;
+  int countdownRemaining;
+  int countdownTotal;
+  String? errorMessage;
+  DateTime? startTime;
+  DateTime? endTime;
+
+  ConcurrentTask({
+    required this.taskId,
+    required this.course,
+    this.status = TaskStatus.waiting,
+    this.statusMessage,
+    this.countdownRemaining = 0,
+    this.countdownTotal = 0,
+    this.errorMessage,
+    this.startTime,
+    this.endTime,
+  });
+
+  /// Get progress (0.0 to 1.0)
+  double get progress {
+    switch (status) {
+      case TaskStatus.waiting:
+        return 0.0;
+      case TaskStatus.preparing:
+        return 0.1;
+      case TaskStatus.countdown:
+        if (countdownTotal > 0) {
+          return 0.1 +
+              0.7 * (countdownTotal - countdownRemaining) / countdownTotal;
+        }
+        return 0.1;
+      case TaskStatus.submitting:
+        return 0.85;
+      case TaskStatus.verifying:
+        return 0.95;
+      case TaskStatus.completed:
+      case TaskStatus.failed:
+        return 1.0;
+    }
+  }
+
+  /// Get status display text
+  String get statusText {
+    if (statusMessage != null) return statusMessage!;
+
+    switch (status) {
+      case TaskStatus.waiting:
+        return '等待开始';
+      case TaskStatus.preparing:
+        return '准备评教';
+      case TaskStatus.countdown:
+        return '等待提交 (${countdownRemaining}s)';
+      case TaskStatus.submitting:
+        return '提交中';
+      case TaskStatus.verifying:
+        return '验证中';
+      case TaskStatus.completed:
+        return '完成';
+      case TaskStatus.failed:
+        return '失败';
+    }
+  }
+
+  /// Check if task is finished
+  bool get isFinished =>
+      status == TaskStatus.completed || status == TaskStatus.failed;
+
+  /// Check if task is successful
+  bool get isSuccess => status == TaskStatus.completed;
+
+  ConcurrentTask copyWith({
+    TaskStatus? status,
+    String? statusMessage,
+    int? countdownRemaining,
+    int? countdownTotal,
+    String? errorMessage,
+    DateTime? startTime,
+    DateTime? endTime,
+  }) {
+    return ConcurrentTask(
+      taskId: taskId,
+      course: course,
+      status: status ?? this.status,
+      statusMessage: statusMessage ?? this.statusMessage,
+      countdownRemaining: countdownRemaining ?? this.countdownRemaining,
+      countdownTotal: countdownTotal ?? this.countdownTotal,
+      errorMessage: errorMessage ?? this.errorMessage,
+      startTime: startTime ?? this.startTime,
+      endTime: endTime ?? this.endTime,
+    );
+  }
+}