class Sensor {
  const Sensor({
    required this.id,
    required this.sensorId,
    this.name,
    this.roomId,
    this.x,
    this.y,
    this.rssiRef,
  });

  final int id;
  final String sensorId; // BLE MAC / provisioning device ID
  final String? name;    // human-readable label
  final int? roomId;
  final double? x;       // floor_x from API
  final double? y;       // floor_y from API
  final double? rssiRef;

  bool get isPlaced => roomId != null;
  String get displayName => name ?? sensorId;

  factory Sensor.fromJson(Map<String, dynamic> json) => Sensor(
        id: json['id'] as int,
        sensorId: json['sensor_id'] as String,
        name: json['name'] as String?,
        roomId: json['room_id'] as int?,
        x: (json['floor_x'] as num?)?.toDouble(),
        y: (json['floor_y'] as num?)?.toDouble(),
        rssiRef: (json['rssi_ref'] as num?)?.toDouble(),
      );

  Sensor copyWith({
    String? name,
    int? roomId,
    double? x,
    double? y,
    double? rssiRef,
  }) =>
      Sensor(
        id: id,
        sensorId: sensorId,
        name: name ?? this.name,
        roomId: roomId ?? this.roomId,
        x: x ?? this.x,
        y: y ?? this.y,
        rssiRef: rssiRef ?? this.rssiRef,
      );
}