# TrackCargoPage.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.tracking;

    import java.text.SimpleDateFormat;
    import java.util.Date;
    import java.util.List;
    import org.apache.wicket.ajax.AjaxRequestTarget;
    import org.apache.wicket.ajax.form.AjaxFormComponentUpdatingBehavior;
    import org.apache.wicket.ajax.markup.html.form.AjaxFallbackButton;
    import org.apache.wicket.markup.html.WebMarkupContainer;
    import org.apache.wicket.markup.html.basic.Label;
    import org.apache.wicket.markup.html.form.Form;
    import org.apache.wicket.markup.html.form.TextField;
    import org.apache.wicket.markup.html.panel.FeedbackPanel;
    import org.apache.wicket.markup.html.panel.Fragment;
    import org.apache.wicket.model.IModel;
    import org.apache.wicket.model.Model;
    import org.apache.wicket.model.PropertyModel;
    import org.apache.wicket.model.StringResourceModel;
    import org.apache.wicket.util.value.ValueMap;
    import org.qi4j.api.unitofwork.NoSuchEntityException;
    import org.qi4j.sample.dcicargo.sample_b.communication.query.CommonQueries;
    import org.qi4j.sample.dcicargo.sample_b.communication.query.TrackingQueries;
    import org.qi4j.sample.dcicargo.sample_b.communication.query.dto.CargoDTO;
    import org.qi4j.sample.dcicargo.sample_b.communication.web.BasePage;
    import org.qi4j.sample.dcicargo.sample_b.data.structure.handling.HandlingEvent;
    import org.qi4j.sample.dcicargo.sample_b.data.structure.handling.HandlingEventType;
    import org.qi4j.sample.dcicargo.sample_b.infrastructure.wicket.form.AbstractForm;
    import org.qi4j.sample.dcicargo.sample_b.infrastructure.wicket.form.SelectorInForm;

    /**
     * Track a cargo
     *
     * For convenience during testing, routed (non-received) cargos can be chosen from the dropdown list.
     */
    public class TrackCargoPage extends BasePage
    {
        public TrackCargoPage()
        {
            super( "tracking" ); // Selects the Tracking tab
            add( new TrackingForm() );
        }

        private final class TrackingForm extends AbstractForm<Void>
        {
            private String trackingId;
            private String selectedTrackingId; // Set by Wicket property resolver

            private TextField<String> trackingIdInput;
            private SelectorInForm selectedTrackingIdSelector;

            private FeedbackPanel feedback = new FeedbackPanel( "feedback" );
            private Fragment statusFragment = new Fragment( "status", "statusFragment", new WebMarkupContainer( "mock" ) );

            private TrackingForm()
            {
                // Manual input
                trackingIdInput = new TextField<String>( "trackingId", new PropertyModel<String>( this, "trackingId" ) );
                add( trackingIdInput.setRequired( true ).setOutputMarkupId( true ) );

                // Submit button
                add( new AjaxFallbackButton( "track", this )
                {
                    @Override
                    protected void onSubmit( AjaxRequestTarget target, Form<?> form )
                    {
                        updateStatusFragment( target );
                    }

                    @Override
                    protected void onError( final AjaxRequestTarget target, Form<?> form )
                    {
                        updateStatusFragment( target );
                        target.add( feedback, trackingIdInput, selectedTrackingIdSelector, statusFragment.setVisible( false ) );
                    }
                } );

                // Drop down selector (for convenience)
                List<String> cargoIds = new TrackingQueries().routedCargos();
                add( selectedTrackingIdSelector = new SelectorInForm(
                    "selectedTrackingId", "Selected Tracking id", cargoIds, this ) );
                selectedTrackingIdSelector.add( new AjaxFormComponentUpdatingBehavior( "onchange" )
                {
                    @Override
                    protected void onUpdate( AjaxRequestTarget target )
                    {
                        trackingId = selectedTrackingId;
                        updateStatusFragment( target );
                    }
                } );

                add( feedback.setOutputMarkupId( true ) );
                add( statusFragment.setOutputMarkupId( true ).setOutputMarkupPlaceholderTag( true ).setVisible( false ) );
            }

            private void updateStatusFragment( final AjaxRequestTarget target )
            {
                try
                {
                    IModel<CargoDTO> cargoModel = new CommonQueries().cargo( trackingId );
                    statusFragment = (Fragment) statusFragment.replaceWith( new StatusFragment( cargoModel, false ) );
                    target.add( feedback, trackingIdInput, selectedTrackingIdSelector, statusFragment.setVisible( true ) );
                }
                catch( NoSuchEntityException e )
                {
                    e.printStackTrace();
                    error( "Cargo '" + trackingId + "' wasn't found in the system. Please check the tracking number." );

                    target.add( feedback, trackingIdInput, selectedTrackingIdSelector, statusFragment.setVisible( false ) );
                }
                catch( Exception e )
                {
                    e.printStackTrace();
                    error( "Problem retrieving status for cargo '" + trackingId + "': " + e.getMessage() );
                    target.add( feedback, trackingIdInput, selectedTrackingIdSelector, statusFragment.setVisible( false ) );
                }
            }

            private class StatusFragment extends Fragment
            {
                public StatusFragment( IModel<CargoDTO> cargoModel, Boolean visible )
                {
                    super( "status", "statusFragment", TrackingForm.this );
                    setVisible( visible );

                    CargoDTO cargo = cargoModel.getObject();

                    // Status ----------------------------------------------------------------------
                    ValueMap map = new ValueMap();
                    map.put( "status", cargo.delivery().get().transportStatus().get().name() );
                    map.put( "trackingId", trackingId );
                    HandlingEvent lastEvent = cargo.delivery().get().lastHandlingEvent().get();
                    if( lastEvent != null )
                    {
                        String voyageString = lastEvent.voyage().get() != null ?
                                              lastEvent.voyage()
                                                  .get()
                                                  .voyageNumber()
                                                  .get()
                                                  .number()
                                                  .get() : "UNKNOWN_VOYAGE";
                        map.put( "voyage", voyageString );
                        map.put( "location", lastEvent.location().get().getString() );
                    }
                    else
                    {
                        map.put( "voyage", "UNKNOWN_VOYAGE" );
                        map.put( "location", cargo.origin().get().getString() );
                    }
                    add( new Label( "transportStatus", new StringResourceModel(
                        "transportStatus.${status}", this, new Model<ValueMap>( map ) ) ) );

                    // ETA ----------------------------------------------------------------------
                    String destination = cargo.routeSpecification().get().destination().get().getString();
                    Date eta = cargo.delivery().get().eta().get();
                    String etaString = eta == null ? "?" : new SimpleDateFormat( "yyyy-MM-dd" ).format( eta );
                    add( new Label( "eta", new StringResourceModel(
                        "eta", this, null, Model.of( destination ), Model.of( etaString ) ) ) );

                    // Warning/Notifier ----------------------------------------------------------------------
                    add( new WebMarkupContainer( "isMisdirected" ).setVisible( cargo.delivery()
                                                                                   .get()
                                                                                   .isMisdirected()
                                                                                   .get() ) );
                    add( new WebMarkupContainer( "isClaimed" ).setVisible(
                        !cargo.delivery().get().isMisdirected().get()
                        && cargo.delivery().get().isUnloadedAtDestination().get()
                        && lastEvent != null
                        && lastEvent.handlingEventType().get() == HandlingEventType.CLAIM
                    ) );

                    // Handling history ----------------------------------------------------------------------
                    if( cargo.delivery().get().lastHandlingEvent().get() == null )
                    {
                        add( new Label( "handlingHistoryPanel" ) );
                    }
                    else
                    {
                        add( new HandlingHistoryPanel( "handlingHistoryPanel", cargoModel, trackingId ) );
                    }
                }
            }
        }
    }