package org.simantics.district.network.ui.contributions;

import java.util.List;

import javax.inject.Named;

import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.e4.core.di.annotations.CanExecute;
import org.eclipse.e4.core.di.annotations.Execute;
import org.eclipse.e4.ui.services.IServiceConstants;
import org.eclipse.jface.viewers.ISelection;
import org.simantics.DatabaseJob;
import org.simantics.Simantics;
import org.simantics.db.Resource;
import org.simantics.db.WriteGraph;
import org.simantics.db.common.request.WriteRequest;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.layer0.SelectionHints;
import org.simantics.district.network.DistrictNetworkUtil;
import org.simantics.district.network.ui.internal.Activator;
import org.simantics.utils.ui.ISelectionUtils;

public class JoinVerticesHandler {

    @CanExecute
    public boolean canExecute(@Named(IServiceConstants.ACTIVE_SELECTION) ISelection selection) {
        List<Resource> vertices = ISelectionUtils.getPossibleKeys(selection, SelectionHints.KEY_MAIN, Resource.class);
        return vertices.size() > 1;
    }
    
    @Execute
    public void execute(@Named(IServiceConstants.ACTIVE_SELECTION) Object selection) {
        final List<Resource> vertices = ISelectionUtils.getPossibleKeys(selection, SelectionHints.KEY_MAIN, Resource.class);
        if (vertices.size() <= 1)
            return;
        Job job = new DatabaseJob("Join selected vertices") {
            
            @Override
            protected IStatus run(IProgressMonitor monitor) {
                try {
                    Simantics.getSession().syncRequest(new WriteRequest() {
                        
                        @Override
                        public void perform(WriteGraph graph) throws DatabaseException {
                            DistrictNetworkUtil.joinVertices(graph, vertices);
                        }
                    });
                } catch (DatabaseException e) {
                    return new Status(IStatus.ERROR, Activator.PLUGIN_ID, getName() + " failed.", e);
                }
                return Status.OK_STATUS;
            }
        };
        job.setUser(true);
        job.schedule();
    }
}