/**

  * 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.common.ui.client.widgets.list.impl;

 import java.util.ArrayList;

 import java.util.List;

 import org.kuali.student.common.dto.Idable;

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

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

 import org.kuali.student.common.ui.client.widgets.list.KSSelectItemWidgetAbstract;

 import org.kuali.student.common.ui.client.widgets.list.ListItems;

 import org.kuali.student.common.ui.client.widgets.list.ModelListItems;

 import com.google.gwt.event.dom.client.BlurHandler;

 import com.google.gwt.event.dom.client.FocusHandler;

 import com.google.gwt.event.shared.HandlerRegistration;

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

 /**

  * This class is a temporary hack to display a list of strings.

  *

  * @author Kuali Student Team

  *

  */

 public class KSLabelListImpl extends KSSelectItemWidgetAbstract {

     private static final HandlerRegistration NO_OP_REGISTRATION = new HandlerRegistration() {

                 @Override

                 public void removeHandler() {

                         // do nothing

                 }

     };

         private FlexTable labels = new FlexTable();

     private List<String> selectedItems = new ArrayList<String>();

     private int maxCols = 1; //default max columns

     private boolean enabled = true;

     public KSLabelListImpl() {

         initWidget(labels);

     }

     /**

      * @see org.kuali.student.common.ui.client.widgets.list.KSSelectItemWidgetAbstract#deSelectItem(java.lang.String)

      */

     public void deSelectItem(String id) {

        this.selectedItems.remove(id);

     }

     /**

      * @see org.kuali.student.common.ui.client.widgets.list.KSSelectItemWidgetAbstract#getSelectedItems()

      */

     public List<String> getSelectedItems() {

         return selectedItems;

     }

     /**

      * @see org.kuali.student.common.ui.client.widgets.list.KSSelectItemWidgetAbstract#selectItem(java.lang.String)

      */

     public void selectItem(String id) {

         if (!selectedItems.contains(id)){

              this.selectedItems.add(id);

         }

         //FIXME: Is there a better way to display selected item here without redrawing

         redraw();

     }

     public void redraw(){

         labels.clear();

         int currCount = 0;

         int row = 0;

         int col = 0;

         int itemCount = 0;

         if (super.getListItems() != null){

                 itemCount = super.getListItems().getItemCount();

         } else {

                 itemCount = selectedItems.size();

         }

         if (maxCols <= 2){

             //Row flow - increment row faster than column

             int maxRows = (itemCount / maxCols) + (itemCount % 2);

             for (String id:selectedItems){

                 currCount++;

                 row = (currCount % maxRows);

                 row = ((row == 0) ? maxRows:row) - 1;

                 labels.setWidget(row, col, createLabel(id));

                 col += ((row + 1)/ maxRows) * 1;

             }

         } else {

             //Column flow - increment column faster than row

             for (String id:selectedItems){

                 currCount++;

                 col = currCount % maxCols;

                 col = ((col == 0) ? maxCols:col) - 1;

                 labels.setWidget(row, col, createLabel(id));

                 row += ((col + 1 )/ maxCols) * 1;

             }

         }

         super.setInitialized(true);

     }

     @Override

     public <T extends Idable> void setListItems(ListItems listItems) {

         if(listItems instanceof ModelListItems){

             Callback<T> redrawCallback = new Callback<T>(){

                 @Override

                 public void exec(T result){

                     KSLabelListImpl.this.redraw();

                 }

             };

             ((ModelListItems<T>)listItems).addOnAddCallback(redrawCallback);

             ((ModelListItems<T>)listItems).addOnRemoveCallback(redrawCallback);

             ((ModelListItems<T>)listItems).addOnUpdateCallback(redrawCallback);

             ((ModelListItems<T>)listItems).addOnBulkUpdateCallback(redrawCallback);

         }

         super.setListItems(listItems);

         redraw();

     }

     private KSLabel createLabel(String id){

             if (super.getListItems() == null || super.getListItems().getItemCount() == 0){

                     return new KSLabel(id);

             } else {

                     return new KSLabel(super.getListItems().getItemText(id));

             }

     }

     public void onLoad() {}

     @Override

     public void setColumnSize(int col) {

         maxCols = col;

     }

     @Override

     public void setEnabled(boolean b) {

 //        enabled = b;

 //        for (int i=0; i < labels.getRowCount(); i++){

 //            for (int j=0; j < labels.getCellCount(i); j++){

 //                ((KSLabel)labels.getWidget(i, j)).setEnabled(b);

 //            }

 //        }

     }

     @Override

     public boolean isEnabled() {

         return enabled;

     }

     @Override

     public boolean isMultipleSelect(){

         return true;

     }

     @Override

     public void clear(){

         selectedItems.clear();

         redraw();

     }

         @Override

         public HandlerRegistration addFocusHandler(FocusHandler handler) {

                 return NO_OP_REGISTRATION;

         }

         @Override

         public HandlerRegistration addBlurHandler(BlurHandler handler) {

                 return NO_OP_REGISTRATION;

         }

 }