/*
    * Copyright 2008 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.opensource.org/licenses/ecl2.php
    * 
   * 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.ole.sys.document.web.renderers;
  
  import java.io.IOException;
  
  import javax.servlet.jsp.JspException;
  import javax.servlet.jsp.JspWriter;
  import javax.servlet.jsp.PageContext;
  import javax.servlet.jsp.tagext.Tag;
  
  import org.kuali.ole.sys.context.SpringContext;
  import org.kuali.rice.core.api.config.property.ConfigurationService;
  
  /**
   * Renders a field as a text field with a date picker
   */
  public class DateRenderer extends TextRenderer {
  
      /**
       * 
       * @see org.kuali.ole.sys.document.web.renderers.TextRenderer#clear()
       */
      @Override
      public void clear() {
          super.clear();
      }
  
      /**
       * 
       * @see org.kuali.ole.sys.document.web.renderers.TextRenderer#render(javax.servlet.jsp.PageContext, javax.servlet.jsp.tagext.Tag, org.kuali.rice.krad.bo.BusinessObject)
       */
      @Override
      public void render(PageContext pageContext, Tag parentTag) throws JspException {
          super.render(pageContext, parentTag);
          
          JspWriter out = pageContext.getOut();
          try {
              out.write(buildDateImage());
              out.write(buildDateJavascript());
          }
          catch (IOException ioe) {
              throw new JspException("Difficulty rendering date picker", ioe);
          }
      }
      
      /**
       * Builds the image for the icon of the date component
       * @return the HTML for the image icon for the date component
       */
      protected String buildDateImage() {
          StringBuilder dateImage = new StringBuilder();
          dateImage.append("<img src=\"");
          dateImage.append(SpringContext.getBean(ConfigurationService.class).getPropertyValueAsString("kr.externalizable.images.url")); 
          dateImage.append("cal.gif\" ");
          dateImage.append("id=\"");
          dateImage.append(getFieldName());
          dateImage.append("_datepicker\" ");
          dateImage.append("style=\"cursor: pointer;\" ");
          dateImage.append("title=\"Date selector for ");
          dateImage.append(getField().getFieldLabel());
          dateImage.append("\" ");
          dateImage.append("alt=\"Date selector for ");
          dateImage.append(this.getAccessibleTitle());
          dateImage.append("\" ");
          dateImage.append("onmouseover=\"this.style.backgroundColor='red';\" ");
          dateImage.append("onmouseout=\"this.style.backgroundColor='transparent';\"");
          dateImage.append(" />\n");
          return dateImage.toString();
      }
      
      /**
       * Builds the JavaScript portion of the date picker
       * @return the HTML for the javascript to make the date component work
       */
      protected String buildDateJavascript() {
          StringBuilder dateJavascript = new StringBuilder();
          dateJavascript.append("<script type=\"text/javascript\">\n");
          dateJavascript.append("Calendar.setup(\n"); 
          dateJavascript.append("  {\n"); 
          dateJavascript.append(" inputField : \"");
          dateJavascript.append(getFieldName());
          dateJavascript.append("\", // ID of the input field\n");
          dateJavascript.append(" ifFormat : \"%m/%d/%Y\", // the date format\n"); 
          dateJavascript.append(" button : \"");
          dateJavascript.append(getFieldName());
         dateJavascript.append("_datepicker\" // ID of the button\n"); 
         dateJavascript.append("  }\n"); 
         dateJavascript.append(");\n");
         dateJavascript.append("</script>");
         
         return dateJavascript.toString();
     }
 
     /**
      * Overridden to do nothing - date fields never need quick finders
      * @see org.kuali.ole.sys.document.web.renderers.FieldRendererBase#renderQuickFinderIfNecessary(javax.servlet.jsp.PageContext, javax.servlet.jsp.tagext.Tag, org.kuali.rice.krad.bo.BusinessObject)
      */
     @Override
     protected void renderQuickFinderIfNecessary(PageContext pageContext, Tag parentTag) throws JspException {
         // do nothing
     }
 
     
 }