package org.kuali.student.common.ui.client.configurable.mvc.binding;

 import java.util.Iterator;

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

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

 import org.kuali.student.core.assembly.data.Data.Property;

 import com.google.gwt.core.client.GWT;

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

 /**

  * Special model widget binding for displaying a list of data objects in a comma separated string list.

  * If the data object in the list is not a string, the innerObjectKey (that is a string value in the object)

  * can be set to be used instead.

  * <br>This is a read only binding, it does not translate back to the model.

  * 

  * @author Kuali Student Team

  *

  */

 public class ListToTextBinding implements ModelWidgetBinding<HasText> {

         private String innerObjectKey;

         public ListToTextBinding(String innerObjectKey) {

                 this.innerObjectKey = innerObjectKey;

         }

         public ListToTextBinding() {

         }

         @Override

         public void setModelValue(HasText widget, DataModel model, String path) {

                 GWT.log("ListToTextBindings cannot be used for setting into the model!");

         }

         @Override

         public void setWidgetValue(HasText widget, DataModel model, String path) {

                 widget.setText(getStringList(model, path));

         }

         public String getStringList(DataModel model, String path) {

                 Data data = model.get(path);

                 String resultString = "";

                 if(data!=null){

                         Iterator<Property> iter = data.realPropertyIterator();

                         while(iter.hasNext()){

                                 Property prop = iter.next();

                                 if (prop.getKey() instanceof Integer){

                         Integer number = (Integer)prop.getKey();

                         Object value = data.get(number);

                         if(value instanceof Data){

                                 DataModel m = new DataModel();

                                 m.setRoot((Data)value);

                                 Object innerObject = m.get(innerObjectKey);

                         // KSLAB-1790 - sometime runtimeData isn't there; no idea why

                         resultString = resultString + (null != innerObject ?

                                                         innerObject.toString() :

                                                         "<no value found for item #" +

                                                             number.toString() +

                                                             " in list of " +

                                                             (path.startsWith("/") ? path.substring(1) : path) + ">") + ", ";

                         }

                         else{

                                 resultString = resultString + value.toString() + ", ";

                         }

                 }

                         }

                 }

                 if(!resultString.isEmpty()){

                         resultString = resultString.trim();

                         resultString = resultString.substring(0, resultString.length() - 1);

                 }

                 return resultString;

         }

         /**

          * If the expected list is a list of data, which value is the value to use in this

          * text list (by key).  If this is not set, it is assumed the list is a list of simple data

          * @param innerObjectKey

          */

         public void setInnerObjectKey(String innerObjectKey) {

                 this.innerObjectKey = innerObjectKey;

         }

         public String getInnerObjectKey() {

                 return innerObjectKey;

         }

 }