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package com.mapbox.services.api.rx.directionsmatrix.v1;

import com.mapbox.services.api.ServicesException;
import com.mapbox.services.api.directionsmatrix.v1.MapboxDirectionsMatrix;
import com.mapbox.services.api.directionsmatrix.v1.models.DirectionsMatrixResponse;

import io.reactivex.Observable;
import retrofit2.Retrofit;
import retrofit2.adapter.rxjava2.RxJava2CallAdapterFactory;
import retrofit2.converter.gson.GsonConverterFactory;

/**
 * The Directions Matrix API allows the calculation of routes between coordinates.
 * 
 * This class has support for Rx Observables.
 *
 * @since 2.1.0
 */
public class MapboxDirectionsMatrixRx extends MapboxDirectionsMatrix {

  private DirectionsMatrixServiceRx serviceRx = null;
  private Observable observable = null;

  public MapboxDirectionsMatrixRx(Builder builder) {
    super(builder);
  }

  private DirectionsMatrixServiceRx getServiceRx() {
    // No need to recreate it
    if (serviceRx != null) {
      return serviceRx;
    }

    // Retrofit instance
    Retrofit retrofit = new Retrofit.Builder()
      .client(getOkHttpClient())
      .baseUrl(builder.getBaseUrl())
      .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
      .addConverterFactory(GsonConverterFactory.create())
      .build();

    // Directions service
    serviceRx = retrofit.create(DirectionsMatrixServiceRx.class);
    return serviceRx;
  }

  public Observable getObservable() {
    // No need to recreate it
    if (observable != null) {
      return observable;
    }

    observable = getServiceRx().getObservable(
      getHeaderUserAgent(builder.getClientAppName()),
      builder.getUser(),
      builder.getProfile(),
      builder.getCoordinates(),
      builder.getAccessToken(),
      builder.getDestinations(),
      builder.getSources());

    // Done
    return observable;
  }

  public static class Builder extends MapboxDirectionsMatrix.Builder {
    @Override
    public MapboxDirectionsMatrixRx build() throws ServicesException {
      super.build();
      return new MapboxDirectionsMatrixRx(this);
    }
  }
}