startGeoFencing method

Implementation

Future<void> startGeoFencing({
  required double radiusMeter,
  required int eventPeriodInSeconds,
  double? lat,
  double? lon,
}) async {
  // Get current location if lat/lon are not provided
  if (lat == null || lon == null) {
    await getCurrentPosition();
  }

  // Create a GeoFirePoint from the current or provided coordinates
  GeoFirePoint center = GeoFirePoint(
    GeoPoint(lat ?? position!.latitude, lon ?? position!.longitude),
  );

  // Reference to Firestore collection where geofences will be stored
  CollectionReference<Map<String, dynamic>> collectionReference =
      FirebaseFirestore.instance.collection('geofences');

  // Adding geofence data to Firestore
  await collectionReference.add({
    'position': center.data, // Store the geofence center
    'radius': radiusMeter, // Store the geofence radius
    'createdAt': FieldValue.serverTimestamp(), // Store the creation time
  });

  // Check geofence status stream
  checkGeofenceStream(center, radiusMeter);
}