/**
    * 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.impl;
  
  import org.kuali.student.common.ui.client.widgets.KSButtonAbstract;
  
  import com.google.gwt.event.dom.client.ClickHandler;
  import com.google.gwt.event.dom.client.MouseOutHandler;
  import com.google.gwt.event.dom.client.MouseOverHandler;
  import com.google.gwt.event.shared.HandlerRegistration;
  import com.google.gwt.user.client.DOM;
  import com.google.gwt.user.client.ui.Anchor;
  import com.google.gwt.user.client.ui.ComplexPanel;
  import com.google.gwt.user.client.ui.InlineLabel;
  import com.google.gwt.user.client.ui.Widget;
  
  public class KSButtonImpl extends KSButtonAbstract{
  
  
  	private static class SpanPanel extends ComplexPanel{
  
  		public SpanPanel(){
  			setElement(DOM.createSpan());
  		}
  
  		  /**
  		   * Adds a new child widget to the panel.
  		   *
  		   * @param w the widget to be added
  		   */
  		  @Override
  		  public void add(Widget w) {
  		    add(w, getElement());
  		  }
  
  		  /**
  		   * Inserts a widget before the specified index.
  		   *
  		   * @param w the widget to be inserted
  		   * @param beforeIndex the index before which it will be inserted
  		   * @throws IndexOutOfBoundsException if <code>beforeIndex</code> is out of
  		   *           range
  		   */
  		  public void insert(Widget w, int beforeIndex) {
  		    insert(w, getElement(), beforeIndex, true);
  		  }
  	}
  
  	private SpanPanel panel = new SpanPanel();
  	private Anchor anchor;
  	private InlineLabel disabledLabel = new InlineLabel();
  	private boolean enabled = true;
  	private ButtonStyle currentStyle;
  
  	public boolean isEnabled() {
  		return enabled;
  	}
  
  	public void setEnabled(boolean enabled) {
  		anchor.setEnabled(enabled);
  		if(enabled){
  			panel.remove(disabledLabel);
  			panel.add(anchor);
  		}
  		else{
  			panel.remove(anchor);
  			panel.add(disabledLabel);
  		}
  	}
  
  	@Override
  	public HandlerRegistration addClickHandler(ClickHandler handler) {
  		return anchor.addClickHandler(handler);
  	}
  
  	@Override
  	public void setText(String text){
  		anchor.setText(text);
  		disabledLabel.setText(text);
  	}
  
  	@Override
  	public HandlerRegistration addMouseOverHandler(MouseOverHandler handler) {
  		return anchor.addMouseOverHandler(handler);
  	}
  
 	@Override
 	public HandlerRegistration addMouseOutHandler(MouseOutHandler handler) {
 		return anchor.addMouseOutHandler(handler);
 	}
 
 	@Override
 	public void init(String text) {
 		init(text, ButtonStyle.PRIMARY);
 	}
 
 	@Override
 	public void init(String text, ButtonStyle style) {
 
 		this.currentStyle = style;
 		disabledLabel.setText(text);
 		anchor = new Anchor();
 		if(currentStyle.getStyle() != null){
 			disabledLabel.setStyleName(currentStyle.getStyle());
 			anchor.setStyleName(currentStyle.getStyle());
 		}
 		String disabledStyle = currentStyle.getDisabledStyle();
 		if(disabledStyle == null){
 			disabledLabel.addStyleName("disabled");
 		}
 		else{
 			disabledLabel.setStyleName(disabledStyle);
 		}
 		anchor.setText(text);
 		anchor.setHref("javascript:return false;");
 
 		panel.add(anchor);
 		anchor.setTabIndex(0);
 
 		this.initWidget(panel);
 	}
 	
 	@Override
     public void addStyleName(String style) {
         anchor.addStyleName(style);
         disabledLabel.addStyleName(style);
     }
 
     @Override
     public void removeStyleName(String style) {
         anchor.removeStyleName(style);
         disabledLabel.removeStyleName(style);        
     }
 
     @Override
     public void setStyleName(String style) {
         anchor.setStyleName(style);
         disabledLabel.setStyleName(style);        
     }
 
     @Override
 	public void init() {
 		init("", ButtonStyle.PRIMARY);
 	}
 
 	@Override
 	public void init(String text, ClickHandler handler) {
 		init(text, ButtonStyle.PRIMARY);
 		anchor.addClickHandler(handler);
 	}
 
     public void init(String text, ButtonStyle style, ClickHandler handler) {
         init(text, style);
         anchor.addClickHandler(handler);
     }
 }