public async Task <Response> MeasureDistance(Request request)
{
var responseFirstAirport = await _getInfoService.GetAsync(request.FirstAirportCode);
var responseSecondAirport = await _getInfoService.GetAsync(request.SecondAirportCode);
if (responseFirstAirport == null || responseSecondAirport == null)
{
throw new HttpRequestException();
}
if (!responseFirstAirport.IsSuccessStatusCode)
{
throw new HttpRequestException(responseFirstAirport.StatusCode.ToString());
}
if (!responseSecondAirport.IsSuccessStatusCode)
{
throw new HttpRequestException(responseSecondAirport.StatusCode.ToString());
}
var firstStrResponse = await responseFirstAirport?.Content?.ReadAsStringAsync();
AirportDetail firstAirportDetail = JsonConvert.DeserializeObject <AirportDetail>(firstStrResponse);
var secondStrResponse = await responseSecondAirport?.Content?.ReadAsStringAsync();
AirportDetail secondAirportDetail = JsonConvert.DeserializeObject <AirportDetail>(secondStrResponse);
if (firstAirportDetail == null || secondAirportDetail == null)
{
throw new HttpRequestException();
}
return(Measure(firstAirportDetail, secondAirportDetail));
}
private Response Measure(AirportDetail first, AirportDetail second)
{
double dlon = Radians(second.location.lon - first.location.lon);
double dlat = Radians(second.location.lat - first.location.lat);
double a = (Math.Sin(dlat / 2) * Math.Sin(dlat / 2)) + Math.Cos(Radians(first.location.lat)) * Math.Cos(Radians(second.location.lat)) * (Math.Sin(dlon / 2) * Math.Sin(dlon / 2));
double angle = 2 * Math.Atan2(Math.Sqrt(a), Math.Sqrt(1 - a));
var result = angle * RADIUS;
return(new Response {
Miles = result.ToString()
});
}