init

client/lib/features/vocabulary/models/review_models.dart

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+/// 复习模式
+enum ReviewMode {
+  adaptive,    // 智能适应
+  sequential,  // 顺序复习
+  random,      // 随机复习
+  difficulty,  // 按难度复习
+}
+
+/// 复习结果
+class ReviewResult {
+  final String wordId;
+  final bool isCorrect;
+  final DateTime timestamp;
+  final Duration reviewTime;
+
+  ReviewResult({
+    required this.wordId,
+    required this.isCorrect,
+    required this.timestamp,
+    required this.reviewTime,
+  });
+}
+
+/// 复习会话
+class ReviewSession {
+  final String id;
+  final DateTime startTime;
+  final int targetCount;
+  final ReviewMode mode;
+  DateTime? endTime;
+  Map<String, ReviewResult> results = {};
+
+  ReviewSession({
+    required this.id,
+    required this.startTime,
+    required this.targetCount,
+    required this.mode,
+    this.endTime,
+  });
+
+  double get accuracy {
+    if (results.isEmpty) return 0.0;
+    final correctCount = results.values.where((r) => r.isCorrect).length;
+    return correctCount / results.length;
+  }
+
+  Duration get totalTime {
+    final end = endTime ?? DateTime.now();
+    return end.difference(startTime);
+  }
+
+  bool get isCompleted => results.length >= targetCount;
+}