/// نموذج بيانات إحداثية GPS
/// يمثل نقطة واحدة مع بيانات الارتفاع والدقة والسرعة
class GpsCoordinate {
  final double latitude;
  final double longitude;
  final double? altitude;
  final double? accuracy;
  final double? speed; // m/s from GPS sensor
  final double? heading; // degrees from north
  final DateTime timestamp;

  GpsCoordinate({
    required this.latitude,
    required this.longitude,
    this.altitude,
    this.accuracy,
    this.speed,
    this.heading,
    required this.timestamp,
  });

  Map<String, dynamic> toMap() {
    return {
      'latitude': latitude,
      'longitude': longitude,
      'altitude': altitude,
      'accuracy': accuracy,
      'speed': speed,
      'heading': heading,
      'timestamp': timestamp.toIso8601String(),
    };
  }

  factory GpsCoordinate.fromMap(Map<String, dynamic> map) {
    return GpsCoordinate(
      latitude: (map['latitude'] as num).toDouble(),
      longitude: (map['longitude'] as num).toDouble(),
      altitude: map['altitude'] != null
          ? (map['altitude'] as num).toDouble()
          : null,
      accuracy: map['accuracy'] != null
          ? (map['accuracy'] as num).toDouble()
          : null,
      speed:
          map['speed'] != null ? (map['speed'] as num).toDouble() : null,
      heading: map['heading'] != null
          ? (map['heading'] as num).toDouble()
          : null,
      timestamp: DateTime.parse(map['timestamp'] as String),
    );
  }

  /// Check if this coordinate has acceptable accuracy for tracking
  bool get isAccurate => accuracy != null && accuracy! <= 25.0;

  /// Check if this is a valid GPS coordinate
  bool get isValid =>
      latitude >= -90 &&
      latitude <= 90 &&
      longitude >= -180 &&
      longitude <= 180;

  @override
  String toString() =>
      'GpsCoordinate(lat: $latitude, lng: $longitude, alt: $altitude, spd: $speed)';
}