import 'dart:math';

import 'package:latlong2/latlong.dart';

LatLng polygonCenterMinmax(List<LatLng> polygon) {
  double minLat = double.infinity;
  double maxLat = double.negativeInfinity;
  double minLng = double.infinity;
  double maxLng = double.negativeInfinity;

  for (LatLng point in polygon) {
    minLat = min(minLat, point.latitude);
    maxLat = max(maxLat, point.latitude);
    minLng = min(minLng, point.longitude);
    maxLng = max(maxLng, point.longitude);
  }

  double centerLat = (minLat + maxLat) / 2;
  double centerLng = (minLng + maxLng) / 2;

  return LatLng(centerLat, centerLng);
}

LatLng polygonCenterAvg(List<LatLng> polygon) {
  double sumLat = 0;
  double sumLng = 0;

  for (LatLng point in polygon) {
    sumLat += point.latitude;
    sumLng += point.longitude;
  }

  double centerLat = sumLat / polygon.length;
  double centerLng = sumLng / polygon.length;

  return LatLng(centerLat, centerLng);
}

bool isPointInPolygonRaycast(LatLng point, List<LatLng> polygon) {
  bool inside = false;
  int len = polygon.length;

  for (int i = 0, j = len - 1; i < len; j = i++) {
    LatLng pi = polygon[i];
    LatLng pj = polygon[j];

    if (((pi.latitude > point.latitude) != (pj.latitude > point.latitude)) &&
        (point.longitude <
            (pj.longitude - pi.longitude) *
                    (point.latitude - pi.latitude) /
                    (pj.latitude - pi.latitude) +
                pi.longitude)) {
      inside = !inside;
    }
  }

  return inside;
}