public void AddLocationFilter(ref Dictionary <string, object> parameters, IMapAPIReadService mapAPIReadService, ref IQueryBuilder queryBuilder, char tablename, string columnname, string countryName = null,
string municipalityName = null, string cityName = null, int?locationRange = null)
{
if (!(cityName is null) && !(locationRange is null))
{
// Use Map API
Coordinates coordinates = mapAPIReadService.GetMapCoordinates(cityName, countryName, municipalityName);
if (!(coordinates is null))
{
parameters.Add("@latitude", coordinates.Latitude);
parameters.Add("@longitude", coordinates.Longitude);
parameters.Add("@rangeKm", locationRange);
queryBuilder.AddSelect(String.Format(@"(
6371 * acos(
cos(radians(@latitude))
* cos(radians({0}.{1}_breedtegraad))
* cos(radians({0}.{1}_lengtegraad) - radians(@longitude))
+ sin(radians(@latitude))
* sin(radians({0}.{1}_breedtegraad))
)) as distance", tablename, columnname));
queryBuilder.AddHaving("distance < @rangeKm");
}