public async Task <IHttpActionResult> CreateTrip(TripReadModel model)
{
var waypoints = model.WayPoints.Select(w => w.Place).ToList();
waypoints.Insert(0, model.StartPoint);
waypoints.Add(model.EndPoint);
DistanseMatrixResponseModel distanseMatrixModel = await _distanceMatrixQuery.GetDistanceMatrix(waypoints);
if (!distanseMatrixModel.Validate())
{
throw new ApplicationException("Invalid response from distanse matrix API");
}
double[,] matrix = distanseMatrixModel.ToArray();
var route = _routeService.CalculateRoute(matrix, 0, waypoints.Count - 1, model.Algorithm);
var trip = model.ToEntity();
_context.Trips.Add(trip);
await _context.SaveChangesAsync();
return(Ok(route));
}
/// <summary>
/// A DistanseMatrixResponseModel extension method that validates the given model.
/// </summary>
///
/// <remarks> Vladyslav, 24.05.2016. </remarks>
///
/// <param name="model"> The model to act on. </param>
///
/// <returns> true if validation succeeds, false if it fails. </returns>
internal static bool Validate(this DistanseMatrixResponseModel model)
{
if (model.Status != ValidationConstants.Ok)
{
return(false);
}
if (model.Rows.Any(row => row.Elements.Any(el => el.Status != ValidationConstants.Ok)))
{
return(false);
}
return(true);
}
/// <summary>
/// A DistanseMatrixResponseModel extension method that convert this object into an array
/// representation.
/// </summary>
///
/// <remarks> Vladyslav, 25.05.2016. </remarks>
///
/// <param name="model"> The model to act on. </param>
///
/// <returns> An array that represents the data in this object. </returns>
public static double[,] ToArray(this DistanseMatrixResponseModel model)
{
var matrix = new double[model.Rows.Count, model.Rows.Count];
for (int i = 0; i < model.Rows.Count; i++)
{
var row = model.Rows[i];
for (int j = 0; j < row.Elements.Count; j++)
{
var element = row.Elements[j];
matrix[i, j] = element.Distance.Value;
}
}
return(matrix);
}
/// <summary> Gets distance matrix. </summary>
///
/// <remarks> Vladyslav, 24.05.2016. </remarks>
///
/// <exception cref="ApplicationException"> Thrown when an response from Google has unsuccessfull status code. </exception>
///
/// <param name="waypoints"> The waypoints. </param>
///
/// <returns> The distance matrix. </returns>
public async Task <DistanseMatrixResponseModel> GetDistanceMatrix(IEnumerable <GooglePlaceModel> waypoints)
{
string requestWaypoints = waypoints.PrepareWaypointsRequestString();
string key = ConfigurationManager.AppSettings["API_KEY"];
string url = string.Format(DistanseMatrixUrl, requestWaypoints, requestWaypoints, key);
using (var message = new HttpRequestMessage(HttpMethod.Get, url))
using (var response = await _httpClient.SendAsync(message))
{
if (!response.IsSuccessStatusCode)
{
throw new ApplicationException("Google Distance Matrix Query Failed");
}
string json = await response.Content.ReadAsStringAsync();
DistanseMatrixResponseModel model = Deserialise(json);
return(model);
}
}
