/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache 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.apache.org/licenses/LICENSE-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.apache.myfaces.custom.swapimage;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.myfaces.shared_tomahawk.renderkit.JSFAttr;
  import org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils;
  import org.apache.myfaces.renderkit.html.util.AddResource;
  import org.apache.myfaces.shared_tomahawk.renderkit.html.HTML;
  import org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlRenderer;
  import org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlRendererUtils;
  import org.apache.myfaces.renderkit.html.util.AddResourceFactory;
  import org.apache.myfaces.custom.navigation.HtmlCommandNavigation;
  
  import javax.faces.component.UIComponent;
  import javax.faces.component.UIGraphic;
  import javax.faces.context.FacesContext;
  import javax.faces.context.ResponseWriter;
  import java.io.IOException;
  
  /**
   * @JSFRenderer
   *   renderKitId = "HTML_BASIC" 
   *   family = "javax.faces.Graphic"
   *   type = "org.apache.myfaces.SwapImage"
   * 
   * @author Thomas Spiegl
   * @version $Revision: 709234 $ $Date: 2008-10-30 15:15:18 -0500 (Thu, 30 Oct 2008) $
   */
  public class HtmlSwapImageRenderer
          extends HtmlRenderer
  {
      private static final Log log = LogFactory.getLog(HtmlSwapImageRenderer.class);
  
      public void encodeEnd(FacesContext facesContext, UIComponent uiComponent)
              throws IOException
      {
          RendererUtils.checkParamValidity(facesContext, uiComponent, UIGraphic.class);
  
          ResponseWriter writer = facesContext.getResponseWriter();
  
          AddResourceFactory.getInstance(facesContext).addJavaScriptAtPosition(facesContext, AddResource.HEADER_BEGIN,
                  HtmlSwapImage.class, "swapimage.js");
  
          String url;
          if (uiComponent instanceof HtmlSwapImage)
          {
              if (uiComponent.getParent() instanceof HtmlCommandNavigation)
              {
                  url = ((HtmlCommandNavigation) uiComponent.getParent()).isActive() ?
                      ((HtmlSwapImage) uiComponent).getActiveImageUrl() : ((HtmlSwapImage)uiComponent).getUrl();
              }
              else
              {
                  url = ((HtmlSwapImage)uiComponent).getUrl();
              }
          }
          else
          {
              url = (String)uiComponent.getAttributes().get(JSFAttr.URL_ATTR);
          }
  
          if ((url != null) && (url.length() > 0))
          {
              writer.startElement(HTML.IMG_ELEM, uiComponent);
  
              renderId(facesContext, uiComponent);
  
              String src = facesContext.getApplication()
                      .getViewHandler().getResourceURL(facesContext, url);
              writer.writeURIAttribute(HTML.SRC_ATTR,
                                       facesContext.getExternalContext().encodeResourceURL(src),
                                       null);
  
              if (uiComponent instanceof HtmlSwapImage)
              {
                  String swapImageUrl = ((HtmlSwapImage) uiComponent).getSwapImageUrl();
                  swapImageUrl = facesContext.getApplication()
                  .getViewHandler().getResourceURL(facesContext, swapImageUrl);
  
                  if (swapImageUrl != null)
                  {
                     writer.writeAttribute(HTML.ONMOUSEOVER_ATTR, "SI_MM_swapImage('" + getClientId(facesContext, uiComponent) + "','','" + facesContext.getExternalContext().encodeResourceURL(swapImageUrl) + "',1);", null);
                     writer.writeAttribute(HTML.ONMOUSEOUT_ATTR, "SI_MM_swapImgRestore();", null);
                 }
             }
 
             HtmlRendererUtils.renderHTMLAttributes(writer, uiComponent, HTML.IMG_PASSTHROUGH_ATTRIBUTES_WITHOUT_ONMOUSEOVER_AND_ONMOUSEOUT);
 
             writer.endElement(HTML.IMG_ELEM);
         }
         else
         {
             if (log.isWarnEnabled()) log.warn("Graphic with id " + uiComponent.getClientId(facesContext) + " has no value (url).");
         }
     }
     
     protected boolean shouldRenderId(
             FacesContext context,
             UIComponent  component)
     {
         //Always return true, since javascript needs it rendered
         return true;
     }
 }