import 'dart:math';
import 'package:latlong2/latlong.dart';

class DistanceCalculatorHS {
  static const int _radius = 6371; // Radius of the Earth in kilometers

  static double _degreeToRadian(double degree) {
    return degree * pi / 180;
  }

  static double calculateDistance(LatLng location1, LatLng location2) {
    double latDistance =
        _degreeToRadian(location2.latitude - location1.latitude);
    double lonDistance =
        _degreeToRadian(location2.longitude - location1.longitude);

    double a = sin(latDistance / 2) * sin(latDistance / 2) +
        cos(_degreeToRadian(location1.latitude)) *
            cos(_degreeToRadian(location2.latitude)) *
            sin(lonDistance / 2) *
            sin(lonDistance / 2);

    double c = 2 * atan2(sqrt(a), sqrt(1 - a));

    double distance = _radius * c * 1000; // Convert to meters

    return distance;
  }
}