# RoutePanel.java

    /*
     * Copyright 2011 Marc Grue.
     *
     * Licensed  under the  Apache License,  Version 2.0  (the "License");
     * you may not use  this file  except in  compliance with the License.
     * You may obtain a copy of the License at
     *
     *   http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed  under the  License is distributed on an "AS IS" BASIS,
     * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY KIND, either  express  or
     * implied.
     *
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */
    package org.qi4j.sample.dcicargo.sample_b.communication.web.booking;

    import java.util.Date;
    import java.util.List;
    import org.apache.wicket.ajax.AjaxRequestTarget;
    import org.apache.wicket.ajax.markup.html.form.AjaxFallbackButton;
    import org.apache.wicket.markup.html.basic.Label;
    import org.apache.wicket.markup.html.form.Form;
    import org.apache.wicket.markup.html.form.StatelessForm;
    import org.apache.wicket.markup.html.list.ListItem;
    import org.apache.wicket.markup.html.list.ListView;
    import org.apache.wicket.markup.html.panel.FeedbackPanel;
    import org.apache.wicket.markup.html.panel.Panel;
    import org.apache.wicket.model.IModel;
    import org.apache.wicket.model.LoadableDetachableModel;
    import org.apache.wicket.model.Model;
    import org.apache.wicket.request.mapper.parameter.PageParameters;
    import org.qi4j.sample.dcicargo.sample_b.context.interaction.booking.routing.AssignCargoToRoute;
    import org.qi4j.sample.dcicargo.sample_b.data.structure.itinerary.Itinerary;
    import org.qi4j.sample.dcicargo.sample_b.data.structure.itinerary.Leg;

    /**
     * Route Panel
     *
     * Shows a suggested route that a Cargo can take.
     *
     * If the user chooses this candidate route, all route data (a value object) is attached by the
     * RegisterNewDestination context as an Itinerary to the Cargo. To see the result, the user is
     * then redirected to the details page of the cargo.
     */
    public class RoutePanel extends Panel
    {
        public RoutePanel( String id,
                           final String trackingIdString,
                           final IModel<Itinerary> candidateRouteModel,
                           int index
        )
        {
            super( id, candidateRouteModel );
            Itinerary itinerary = candidateRouteModel.getObject();

            IModel<String> header = Model.of( "Route candidate " + index + " - duration: " + itinerary.days() + " days." );
            add( new Label( "routeHeader", header ) );

            final FeedbackPanel routeFeedback = new FeedbackPanel( "routeFeedback" );
            add( routeFeedback.setOutputMarkupId( true ).setEscapeModelStrings( true ) );

            IModel<List<Leg>> legListModel = new LoadableDetachableModel<List<Leg>>()
            {
                @Override
                protected List<Leg> load()
                {
                    return candidateRouteModel.getObject().legs().get();
                }
            };

            add( new ListView<Leg>( "legs", legListModel )
            {
                @Override
                protected void populateItem( ListItem<Leg> item )
                {
                    Leg leg = item.getModelObject();
                    item.add( new Label( "voyage", leg.voyage().get().toString() ),
                              new Label( "loadLocation", leg.loadLocation().get().getCode() ),
                              new Label( "loadTime", new Model<Date>( leg.loadTime().get() ) ),
                              new Label( "unloadLocation", leg.unloadLocation().get().getCode() ),
                              new Label( "unloadTime", new Model<Date>( leg.unloadTime().get() ) )
                    );
                }
            } );

            StatelessForm form = new StatelessForm<Void>( "form" );
            form.add( new AjaxFallbackButton( "assign", form )
            {
                @Override
                protected void onSubmit( AjaxRequestTarget target, Form<?> form )
                {
                    try
                    {
                        Itinerary itinerary = candidateRouteModel.getObject();
                        new AssignCargoToRoute( trackingIdString, itinerary ).assign();
                        setResponsePage( CargoDetailsPage.class, new PageParameters().set( 0, trackingIdString ) );
                    }
                    catch( Exception e )
                    {
                        String msg = "Problem assigning this route to cargo: " + e.getMessage();
                        routeFeedback.error( msg );
                        target.add( routeFeedback );
                    }
                }

                @Override
                protected void onError( final AjaxRequestTarget target, Form<?> form )
                {
                    routeFeedback.error( "Unexpected error - all routes are expected to be valid." );
                    target.add( routeFeedback );
                }
            } );
            add( form );
        }
    }