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package org.glassfish.jersey.examples.rx.agent;

import java.util.ArrayList;
import java.util.List;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.GenericType;

import org.glassfish.jersey.examples.rx.domain.AgentResponse;
import org.glassfish.jersey.examples.rx.domain.Calculation;
import org.glassfish.jersey.examples.rx.domain.Destination;
import org.glassfish.jersey.examples.rx.domain.Forecast;
import org.glassfish.jersey.examples.rx.domain.Recommendation;
import org.glassfish.jersey.server.Uri;

/**
 * Obtain information about visited (destination) and recommended (destination, forecast, price) places for "Sync" user. Uses
 * standard JAX-RS sync approach to obtain the data.
 *
 * @author Michal Gajdos (michal.gajdos at oracle.com)
 */
@Path("agent/sync")
@Produces("application/json")
public class SyncAgentResource {

    @Uri("remote/destination")
    private WebTarget destination;

    @Uri("remote/calculation/from/{from}/to/{to}")
    private WebTarget calculation;

    @Uri("remote/forecast/{destination}")
    private WebTarget forecast;

    @GET
    public AgentResponse sync() {
        final long time = System.nanoTime();
        final AgentResponse response = new AgentResponse();

        // Obtain visited destinations.
        response.setVisited(destination.path("visited").request()
                // Identify the user.
                .header("Rx-User", "Sync")
                // Return a list of destinations
                .get(new GenericType<List<Destination>>() {}));

        // Obtain recommended destinations. (does not depend on visited ones)
        final List<Destination> recommended = destination.path("recommended").request()
                // Identify the user.
                .header("Rx-User", "Sync")
                // Return a list of destinations.
                .get(new GenericType<List<Destination>>() {});

        // Forecasts. (depend on recommended destinations)
        final List<Forecast> forecasts = new ArrayList<>(recommended.size());
        for (final Destination dest : recommended) {
            forecasts.add(forecast.resolveTemplate("destination", dest.getDestination()).request().get(Forecast.class));
        }

        // Calculations. (depend on recommended destinations)
        final List<Calculation> calculations = new ArrayList<>(recommended.size());
        for (final Destination dest : recommended) {
            calculations.add(calculation.resolveTemplate("from", "Moon").resolveTemplate("to", dest.getDestination())
                    .request().get(Calculation.class));
        }

        // Recommendations.
        final List<Recommendation> recommendations = new ArrayList<>(recommended.size());
        for (int i = 0; i < recommended.size(); i++) {
            recommendations.add(new Recommendation(recommended.get(i).getDestination(), forecasts.get(i).getForecast(),
                    calculations.get(i).getPrice()));
        }

        response.setRecommended(recommendations);
        response.setProcessingTime((System.nanoTime() - time) / 1000000);
        return response;
    }
}
