package org.simantics.district.route.ui.actions;

import java.util.List;
import java.util.concurrent.CompletableFuture;

import org.simantics.Simantics;
import org.simantics.db.Resource;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.layer0.adapter.ActionFactory;
import org.simantics.district.route.Route;
import org.simantics.district.route.RouteJob;
import org.simantics.district.route.RouterConfiguration;
import org.simantics.district.route.internal.RoutePersistence;
import org.simantics.utils.ui.dialogs.ShowMessage;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ValidateRouteAction implements ActionFactory {

    protected static final Logger LOGGER = LoggerFactory.getLogger(ValidateRouteAction.class);

    @Override
    public Runnable create(Object target) {
        if (!(target instanceof Resource))
            return null;

        return new Runnable() {
            @Override
            public void run() {
                try {
                    Route route = Simantics.getSession().syncRequest(new RoutePersistence.RouteRequest((Resource)target));
                    if (route == null) {
                        ShowMessage.showInformation("Route Validation", "Reading the route object failed");
                        LOGGER.error("Reading a route object failed"); //$NON-NLS-1$
                        return;
                    }
                    
                    CompletableFuture<List<Resource>> result = new CompletableFuture<>();
                    result.exceptionally(e -> null).thenAccept(dnElements -> {
                        if (dnElements != null) {
                            if (!dnElements.isEmpty())
                                ShowMessage.showInformation("Route Validation", "The route is valid");
                            else
                                ShowMessage.showInformation("Route Validation", "The route produced an empty list of vertices");
                        }
                    });
                    
                    RouterConfiguration config = new RouterConfiguration();
                    new RouteJob(config, route, result).schedule();
                }
                catch (DatabaseException e) {
                    LOGGER.error("Error in selecting route " + target, e); //$NON-NLS-1$
                }
            }
        };
    }
}