first commit

lib/models/time_goal.dart

@@ -0,0 +1,54 @@
+class TimeGoal {
+  final int? id;
+  final String goalType; // 'daily_total' 或 'daily_category'
+  final String? category; // 如果是分类目标，指定分类
+  final int targetTime; // 目标时长（秒）
+  final bool isActive;
+  final DateTime createdAt;
+  final DateTime updatedAt;
+
+  TimeGoal({
+    this.id,
+    required this.goalType,
+    this.category,
+    required this.targetTime,
+    this.isActive = true,
+    required this.createdAt,
+    required this.updatedAt,
+  });
+
+  Map<String, dynamic> toMap() {
+    return {
+      'id': id,
+      'goal_type': goalType,
+      'category': category,
+      'target_time': targetTime,
+      'is_active': isActive ? 1 : 0,
+      'created_at': createdAt.millisecondsSinceEpoch ~/ 1000,
+      'updated_at': updatedAt.millisecondsSinceEpoch ~/ 1000,
+    };
+  }
+
+  factory TimeGoal.fromMap(Map<String, dynamic> map) {
+    return TimeGoal(
+      id: map['id'] as int?,
+      goalType: map['goal_type'] as String,
+      category: map['category'] as String?,
+      targetTime: map['target_time'] as int,
+      isActive: (map['is_active'] as int) == 1,
+      createdAt: DateTime.fromMillisecondsSinceEpoch((map['created_at'] as int) * 1000),
+      updatedAt: DateTime.fromMillisecondsSinceEpoch((map['updated_at'] as int) * 1000),
+    );
+  }
+
+  // 格式化目标时长
+  String get formattedTargetTime {
+    final hours = targetTime ~/ 3600;
+    final minutes = (targetTime % 3600) ~/ 60;
+    if (hours > 0) {
+      return '${hours}小时${minutes}分钟';
+    }
+    return '${minutes}分钟';
+  }
+}
+