/// 告警级别枚举。
enum AlertLevel {
  /// 严重。
  critical,

  /// 警告。
  warning,

  /// 提示。
  info;

  /// 级别中文名称。
  String get label {
    switch (this) {
      case AlertLevel.critical:
        return '严重';
      case AlertLevel.warning:
        return '警告';
      case AlertLevel.info:
        return '提示';
    }
  }

  /// 从字符串解析级别。
  static AlertLevel fromString(String value) {
    return AlertLevel.values.firstWhere(
      (level) => level.name == value,
      orElse: () => AlertLevel.info,
    );
  }
}

/// 告警模型。
class Alert {
  const Alert({
    required this.id,
    required this.deviceId,
    required this.deviceName,
    required this.title,
    required this.message,
    required this.level,
    required this.occurredAt,
    required this.acknowledged,
  });

  /// 告警唯一标识。
  final String id;

  /// 关联设备 ID。
  final String deviceId;

  /// 关联设备名称。
  final String deviceName;

  /// 告警标题。
  final String title;

  /// 告警详情。
  final String message;

  /// 告警级别。
  final AlertLevel level;

  /// 发生时间。
  final DateTime occurredAt;

  /// 是否已确认。
  final bool acknowledged;

  factory Alert.fromJson(Map<String, dynamic> json) {
    return Alert(
      id: json['id'] as String,
      deviceId: json['deviceId'] as String,
      deviceName: json['deviceName'] as String,
      title: json['title'] as String,
      message: json['message'] as String,
      level: AlertLevel.fromString(json['level'] as String),
      occurredAt: DateTime.parse(json['occurredAt'] as String),
      acknowledged: json['acknowledged'] as bool,
    );
  }

  Map<String, dynamic> toJson() {
    return {
      'id': id,
      'deviceId': deviceId,
      'deviceName': deviceName,
      'title': title,
      'message': message,
      'level': level.name,
      'occurredAt': occurredAt.toIso8601String(),
      'acknowledged': acknowledged,
    };
  }
}