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

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

import javax.inject.Named;

import org.eclipse.e4.core.di.annotations.CanExecute;
import org.eclipse.e4.core.di.annotations.Execute;
import org.eclipse.e4.ui.model.application.ui.basic.MPart;
import org.eclipse.e4.ui.services.IServiceConstants;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.simantics.db.Resource;
import org.simantics.db.exception.DatabaseException;
import org.simantics.district.network.ui.DistrictNetworkUIUtil;
import org.simantics.district.route.Route;
import org.simantics.district.route.RouteJob;
import org.simantics.district.route.RouterConfiguration;
import org.simantics.utils.ui.ISelectionUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Tuukka Lehtonen
 */
public class SelectRouteOnDiagram {

    private static final Logger LOGGER = LoggerFactory.getLogger(SelectRouteOnDiagram.class);

    @CanExecute
    public boolean canExecute(@Named(IServiceConstants.ACTIVE_SELECTION) ISelection selection) {
        return ISelectionUtils.filterSingleSelection(selection, Route.class) != null;
    }

    @Execute
    public void execute(@Named(IServiceConstants.ACTIVE_SHELL) Shell activeShell,
            @Named(IServiceConstants.ACTIVE_PART) MPart part,
            @Named(IServiceConstants.ACTIVE_SELECTION) ISelection selection) {
        // get selected route
        Route route = ISelectionUtils.filterSingleSelection(selection, Route.class);
        if (route == null)
            return;

        Display display = activeShell.getDisplay();
        CompletableFuture<List<Resource>> result = new CompletableFuture<>();
        result
        .exceptionally(e -> Collections.emptyList())
        .thenAccept(dnElements -> {
            if (!dnElements.isEmpty()) {
                try {
                    DistrictNetworkUIUtil.openDNDiagramWithSelection(display, dnElements);
                } catch (DatabaseException e) {
                    LOGGER.error("Failed to open district network diagram with selection {}", dnElements); //$NON-NLS-1$
                }
            }
        });

        RouterConfiguration config = new RouterConfiguration();
        new RouteJob(config, route, result).schedule();
    }
}