/**

  * Copyright 2010 The Kuali Foundation Licensed under the

  * Educational Community 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.osedu.org/licenses/ECL-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.kuali.student.lum.lu.ui.tools.client.widgets;

 import java.util.ArrayList;

 import java.util.Collections;

 import java.util.LinkedHashMap;

 import java.util.List;

 import java.util.Map;

 import org.kuali.student.common.ui.client.application.Application;

 import org.kuali.student.common.ui.client.application.ViewContext;

 import org.kuali.student.common.ui.client.configurable.mvc.WidgetConfigInfo;

 import org.kuali.student.common.ui.client.mvc.Controller;

 import org.kuali.student.common.ui.client.widgets.KSErrorDialog;

 import org.kuali.student.common.ui.client.widgets.layout.VerticalFlowPanel;

 import org.kuali.student.common.ui.shared.IdAttributes.IdType;

 import org.kuali.student.core.assembly.data.LookupMetadata;

 import org.kuali.student.core.assembly.data.LookupParamMetadata;

 import com.google.gwt.user.client.Window;

 import com.google.gwt.user.client.ui.Composite;

 public class KSBrowser extends Composite {

         private List<BrowsePanel> browsePanels;

         private LookupMetadata fieldLookup;

         private List<LookupMetadata> cascadingLookups;

         private List<LookupParamMetadata> cascadingChildParameters;

         private WidgetConfigInfo config;

         private VerticalFlowPanel layout = new VerticalFlowPanel ();

         public KSBrowser (LookupMetadata fieldLookup, Controller controller)

         {

                 this.fieldLookup = fieldLookup;

                 if (config == null)

                 {

                         config = new WidgetConfigInfo ();

                 }

                 browsePanels = new ArrayList<BrowsePanel> ();

                 cascadingLookups = new ArrayList<LookupMetadata> ();

                 cascadingChildParameters = new ArrayList<LookupParamMetadata> ();

                 cascadingLookups.add (this.fieldLookup);

                 this.addChildLookups (this.fieldLookup);

                 Collections.reverse (cascadingChildParameters);

                 Collections.reverse (cascadingLookups);

                 for (LookupMetadata lookupMetadata : cascadingLookups)

                 {

                         BrowsePanel browsePanel = new BrowsePanel (lookupMetadata);

                         browsePanels.add (browsePanel);

                         layout.add (browsePanel);

                 }

                 for (int i = 0; i < browsePanels.size () - 1; i ++)

                 {

                         BrowsePanel currentBP = browsePanels.get (i);

                         LookupParamMetadata nextParamMetadata = this.cascadingChildParameters.get (i);

                         BrowsePanel nextBP = browsePanels.get (i + 1);

                         currentBP.setOnSelectectedCallback (new ExecuteNextSearchCallback (nextBP, nextParamMetadata));

                 }

                 browsePanels.get (browsePanels.size () - 1).setOnSelectectedCallback (new ViewCourseCallback (controller));

                 this.initWidget (layout);

                 browsePanels.get (0).executeSearch ();

         }

         private class ExecuteNextSearchCallback implements BrowsePanel.OnSelectedCallback {

                 private BrowsePanel nextBrowsePanel;

                 private LookupParamMetadata nextParamMetadata;

                 public ExecuteNextSearchCallback (BrowsePanel nextBrowsePanel,

                                 LookupParamMetadata nextParamMetadata) {

                         this.nextBrowsePanel = nextBrowsePanel;

                         this.nextParamMetadata = nextParamMetadata;

                 }

                 @Override

                 public void selected (List<String> selectedIds)        {

                         if (selectedIds.size () == 0) {

                                 Window.alert ("Please select a row before clicking");

                                 return;

                         }

                         Map<String, Object> parameters = new LinkedHashMap<String, Object> ();

                         parameters.put (nextParamMetadata.getKey (), selectedIds.get (0));

                         nextBrowsePanel.setParameters (parameters);

                         nextBrowsePanel.executeSearch ();

                 }

         }

         private class ViewCourseCallback implements BrowsePanel.OnSelectedCallback {

                 private Controller controller;

                 public ViewCourseCallback (Controller controller)

                 {

                         this.controller = controller;

                 }

                 @Override

                 public void selected (List<String> selectedIds)        {

                         if (selectedIds.size () == 0) {

                                 Window.alert ("Please select a row before clicking");

                                 return;

                         }

                         ViewContext viewContext = new ViewContext ();

                         viewContext.setId (selectedIds.get (0));

                         viewContext.setIdType (IdType.OBJECT_ID);

                         Application.navigate("/HOME/CURRICULUM_HOME/VIEW_COURSE", viewContext);

                 }

         }

         private void addChildLookups (LookupMetadata current) {

                 for (LookupParamMetadata param : current.getParams ())        {

                         if (param.getChildLookup () != null) {

                                 cascadingChildParameters.add (param);

                                 cascadingLookups.add (param.getChildLookup ());

                                 addChildLookups (param.getChildLookup ());

                         }

                 }

         }

 }