/*
    * 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.subform;
  
  import org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils;
  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.shared_tomahawk.renderkit.html.util.FormInfo;
  
  import javax.faces.component.UIComponent;
  import javax.faces.context.FacesContext;
  import javax.faces.context.ResponseWriter;
  
  import java.io.IOException;
  import java.util.Map;
  
  /**
   * 
   * @JSFRenderer
   *   renderKitId = "HTML_BASIC" 
   *   family = "org.apache.myfaces.SubForm"
   *   type = "org.apache.myfaces.SubForm"
   * @since 1.1.7
   * @author Gerald Muellan
   *         Date: 19.01.2006
   *         Time: 14:01:35
   */
  public class SubFormRenderer extends HtmlRenderer
  {
      private static final String SUBMIT_FUNCTION_SUFFIX = "_submit";
      private static final String HIDDEN_PARAM_NAME = "org.apache.myfaces.custom.subform.submittedId";
  
      
      public void encodeBegin(FacesContext context, UIComponent component) throws IOException
      {
          super.encodeBegin(context, component);
  
          ResponseWriter writer = context.getResponseWriter();
  
          HtmlRendererUtils.writePrettyLineSeparator(context);
          writer.startElement(HTML.SCRIPT_ELEM, null);
          writer.writeAttribute(org.apache.myfaces.shared_tomahawk.renderkit.html.HTML.SCRIPT_TYPE_ATTR, org.apache.myfaces.shared_tomahawk.renderkit.html.HTML.SCRIPT_TYPE_TEXT_JAVASCRIPT, null);
  
          FormInfo parentFormInfo = RendererUtils.findNestingForm(component,context);
          if(parentFormInfo!=null)
          {
              writer.writeText(createPartialSubmitJS(component.getId(), parentFormInfo.getFormName()), null);
          }
  
          writer.endElement(org.apache.myfaces.shared_tomahawk.renderkit.html.HTML.SCRIPT_ELEM);
          HtmlRendererUtils.writePrettyLineSeparator(context);
      }
      
  
      public void decode(FacesContext context, UIComponent component)
      {
          super.decode(context, component);
  
          Map paramValuesMap = context.getExternalContext().getRequestParameterMap();
          String reqValue = (String) paramValuesMap.get(HIDDEN_PARAM_NAME);
          if (reqValue != null && component.getId().equals(reqValue))
          {
              ((SubForm) component).setSubmitted(true);
          }
      }
  
      
      protected String createPartialSubmitJS(String subFormId, String parentFormClientId)
      {
          StringBuffer script = new StringBuffer();
          script.append("function ");
          script.append(subFormId).append(SUBMIT_FUNCTION_SUFFIX + "()");
          script.append(" {\n");
          script.append("var form = document.forms['").append(parentFormClientId).append("'];\n");
          script.append("var el = document.createElement(\"input\");\n");
          script.append("el.type = \"hidden\";\n");
          script.append("el.name = \"" + HIDDEN_PARAM_NAME + "\";\n");
          script.append("el.value = \"").append(subFormId).append("\";\n");
          script.append("form.appendChild(el);\n");
          script.append("form.submit();\n");
          script.append("}\n");
  
         return script.toString();
     }
 
 }