/**

  * 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.suggestbox;

 import java.util.Map;

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

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

 import org.kuali.student.common.ui.client.util.UtilConstants;

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

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

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

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

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

 import org.kuali.student.common.ui.client.widgets.suggestbox.IdableSuggestOracle.IdableSuggestion;

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

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

 import com.google.gwt.event.logical.shared.SelectionEvent;

 import com.google.gwt.event.logical.shared.SelectionHandler;

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

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

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

 // TODO implement some form of focus handling for SuggestBox

 public class KSSuggestBox extends SuggestBox implements HasSelectionChangeHandlers, TranslatableValueWidget, HasWatermark{

     private IdableSuggestion currentSuggestion = null;

     private IdableSuggestOracle oracle;

     private String currentId = "";

     public KSSuggestBox(IdableSuggestOracle oracle) {

             this(oracle, true);

     }

     public KSSuggestBox(IdableSuggestOracle oracle, boolean enabled){

             super(oracle, new KSTextBox());

             super.getTextBox().setEnabled(enabled);

         this.oracle = oracle;

         oracle.addSearchCompletedCallback(new Callback<IdableSuggestion>() {

             @Override

             public void exec(IdableSuggestion result) {

                 currentSuggestion = result;

                 currentId = KSSuggestBox.this.getSelectedId();

                 SelectionChangeEvent.fire(KSSuggestBox.this);

             }

         });

         this.addSelectionHandler(new SelectionHandler<SuggestOracle.Suggestion>(){

             @Override

             public void onSelection(SelectionEvent<SuggestOracle.Suggestion> event) {

                 currentSuggestion = (IdableSuggestion)(event.getSelectedItem());

                 getTextBox().setFocus(true);

                 currentId = KSSuggestBox.this.getSelectedId();

                 SelectionChangeEvent.fire(KSSuggestBox.this);

             }

         });

         this.getTextBox().addBlurHandler(new BlurHandler(){

             @Override

             public void onBlur(BlurEvent event) {

                 String currentText = KSSuggestBox.this.getText();

                 boolean isEmpty = false;

                 if(currentText != null && !currentText.equals("")){

                         if((currentSuggestion != null && !KSSuggestBox.this.getText().equals(currentSuggestion.getReplacementString()))

                                         || currentSuggestion == null){

                                 currentSuggestion = KSSuggestBox.this.oracle.getSuggestionByText(currentText);

                         }

                     if(currentSuggestion == null){

                             currentSuggestion = new IdableSuggestion();

                         String impossibleCharacters = UtilConstants.IMPOSSIBLE_CHARACTERS;

                             currentSuggestion.setId(impossibleCharacters);

                             currentSuggestion.setDisplayString(impossibleCharacters);

                             currentSuggestion.setReplacementString(impossibleCharacters);

                     }

                 }

                 else if(currentText == null || currentText.equals("")){

                     isEmpty = true;

                     currentId = "";

                         currentSuggestion = new IdableSuggestion();

                         currentSuggestion.setId("");

                         currentSuggestion.setDisplayString("");

                         currentSuggestion.setReplacementString("");                        

                 }

                 if(!KSSuggestBox.this.getSelectedId().equals(currentId)){

                         currentId = KSSuggestBox.this.getSelectedId();

                     if(isEmpty){

                         currentId = "";

                     }

                     if (!currentId.equals(UtilConstants.IMPOSSIBLE_CHARACTERS)) {

                         SelectionChangeEvent.fire(KSSuggestBox.this);

                     }

                 }                

             }

         });

     }

     public void reset(){

         this.setText("");

         currentSuggestion = null;

     }

     public IdableSuggestion getSelectedSuggestion() {

         return currentSuggestion;

     }   

     public String getSelectedId() {

         String id = "";

         if(currentSuggestion != null){

             id = currentSuggestion.getId();

         }

         if(!currentId.isEmpty() && id.isEmpty()){

             id = UtilConstants.IMPOSSIBLE_CHARACTERS;

         }

         return id;

     }

     public IdableSuggestOracle getOracle() {

         return oracle;

     }

     @Override

     public String getValue() {

         return this.getSelectedId();

     }

     @Override

     public void setValue(String id) {

             if(id == null || id.equals("")){

                 currentSuggestion = new IdableSuggestion();

                 currentSuggestion.setId("");

                 currentSuggestion.setDisplayString("");

                 currentSuggestion.setReplacementString("");

                 currentId = KSSuggestBox.this.getSelectedId();

             KSSuggestBox.this.setText("");

             }

             else

             {

                 oracle.getSuggestionByIdSearch(id, new Callback<IdableSuggestion>(){

                     @Override

                     public void exec(IdableSuggestion result) {

                         currentSuggestion = result;

                         KSSuggestBox.this.setText((currentSuggestion == null) ? "" : currentSuggestion.getReplacementString());

                         currentId = KSSuggestBox.this.getSelectedId();

                     }

                 });

             }

     }   

     public void setValue(String id, final Callback<IdableSuggestion> callback) {

             if(id == null || id.equals("")){

                 currentSuggestion = new IdableSuggestion();

                 currentSuggestion.setId("");

                 currentSuggestion.setDisplayString("");

                 currentSuggestion.setReplacementString("");

                 KSSuggestBox.this.setText("");

                 currentId = KSSuggestBox.this.getSelectedId();

                 callback.exec(currentSuggestion);

             }

             else

             {

                 oracle.getSuggestionByIdSearch(id, new Callback<IdableSuggestion>(){

                     @Override

                     public void exec(IdableSuggestion result) {

                         currentSuggestion = result;

                         KSSuggestBox.this.setText((currentSuggestion == null) ? "" : currentSuggestion.getReplacementString());

                         currentId = KSSuggestBox.this.getSelectedId();

                         callback.exec(currentSuggestion);

                     }

                 });

             }

     }

     public void setValue(String id, String translation) {

             currentSuggestion = new IdableSuggestion();

             currentSuggestion.setId(id);

             currentSuggestion.setDisplayString(translation);

             currentSuggestion.setReplacementString(translation);

             KSSuggestBox.this.setText(translation);

             currentId = KSSuggestBox.this.getSelectedId();

     }

     @Override

     public void setValue(String id, boolean fireEvents) {

             if(fireEvents == true){

                     if(id == null || id.equals("")){

                         currentSuggestion = new IdableSuggestion();

                         currentSuggestion.setId("");

                         currentSuggestion.setDisplayString("");

                         currentSuggestion.setReplacementString("");

                         KSSuggestBox.this.setText("");

                         currentId = KSSuggestBox.this.getSelectedId();

                     }

                     else

                     {

                         oracle.getSuggestionByIdSearch(id, new Callback<IdableSuggestion>(){

                             @Override

                             public void exec(IdableSuggestion result) {

                                 currentSuggestion = result;

                                 KSSuggestBox.this.setText((currentSuggestion == null) ? "" : currentSuggestion.getReplacementString());         

                                     if(!KSSuggestBox.this.getSelectedId().equals(currentId)){

                                             SelectionChangeEvent.fire(KSSuggestBox.this);

                                             currentId = KSSuggestBox.this.getSelectedId();

                                     }

                             }

                         });

                     }

             }

             else

             {

                     this.setValue(id);

             }

     }

     public void setValue(IdableSuggestion theSuggestion) {

             currentSuggestion = theSuggestion;

             SelectionChangeEvent.fire(KSSuggestBox.this);

             KSSuggestBox.this.setText((currentSuggestion == null) ? "" : currentSuggestion.getReplacementString());

             currentId = KSSuggestBox.this.getSelectedId();

     }

         @Override

         public HandlerRegistration addSelectionChangeHandler(

                         SelectionChangeHandler handler) {

                 return addHandler(handler, SelectionChangeEvent.getType());

         }

     public IdableSuggestion getCurrentSuggestion() {

         return currentSuggestion;

     }

     @Override

     public void setValue(Map<String, String> translations) {

         // TODO ryan - THIS METHOD NEEDS JAVADOCS

     }

         @Override

         public void setWatermarkText(String text) {

                 ((KSTextBox)super.getTextBox()).setWatermarkText(text);

         }

         @Override

         public boolean hasWatermark(){

                 return ((KSTextBox)super.getTextBox()).hasWatermark();

         }

         @Override

         public boolean watermarkShowing() {

                 return ((KSTextBox)super.getTextBox()).hasWatermark();

         }

 }