/**
    * Copyright 2005-2011 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.rice.coreservice.impl.style;
  
  import org.apache.log4j.Logger;
  import org.kuali.rice.coreservice.api.style.Style;
  import org.kuali.rice.coreservice.api.style.StyleRepositoryService;
  import org.kuali.rice.coreservice.api.style.StyleService;
  import org.kuali.rice.coreservice.framework.CoreFrameworkServiceLocator;
  import org.kuali.rice.kew.api.KewApiConstants;
  import org.kuali.rice.krad.util.KRADConstants;
  
  import javax.xml.transform.Templates;
  import javax.xml.transform.TransformerConfigurationException;
  import javax.xml.transform.TransformerFactory;
  import javax.xml.transform.stream.StreamSource;
  import java.io.StringReader;
  import java.util.List;
  import java.util.Properties;
  
  
  /**
   * Implements generic StyleService via existing EDL style table
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class StyleServiceImpl implements StyleService {
  	
      private static final Logger LOG = Logger.getLogger(StyleServiceImpl.class);
  
      private StyleRepositoryService styleRepositoryService;
  
      public void setStyleRepositoryService(StyleRepositoryService styleRepositoryService) {
      	this.styleRepositoryService = styleRepositoryService;
      }
  
      /**
       * Loads the named style from the database, or (if configured) imports it from a file
       * specified via a configuration parameter with a name of the format edl.style.<styleName>
       * {@inheritDoc}
       */
      @Override
      public Style getStyle(String styleName) {
      	return styleRepositoryService.getStyle(styleName);
      }
  
      @Override
      public Templates getStyleAsTranslet(String name) throws TransformerConfigurationException {
          if (name == null) {
              return null;
          }
  
          Style style = getStyle(name);
          if (style == null) {
              return null;
          }
  
          boolean useXSLTC = CoreFrameworkServiceLocator.getParameterService().getParameterValueAsBoolean(KewApiConstants.KEW_NAMESPACE, KRADConstants.DetailTypes.EDOC_LITE_DETAIL_TYPE, KewApiConstants.EDL_USE_XSLTC_IND);
          if (useXSLTC) {
              LOG.info("using xsltc to compile stylesheet");
              String key = "javax.xml.transform.TransformerFactory";
              String value = "org.apache.xalan.xsltc.trax.TransformerFactoryImpl";
              Properties props = System.getProperties();
              props.put(key, value);
              System.setProperties(props);
          }
  
          TransformerFactory factory = TransformerFactory.newInstance();
          factory.setURIResolver(new StyleUriResolver(this));
  
          if (useXSLTC) {
              factory.setAttribute("translet-name",name);
              factory.setAttribute("generate-translet",Boolean.TRUE);
              String debugTransform = CoreFrameworkServiceLocator.getParameterService().getParameterValueAsString(KewApiConstants.KEW_NAMESPACE, KRADConstants.DetailTypes.EDOC_LITE_DETAIL_TYPE, KewApiConstants.EDL_DEBUG_TRANSFORM_IND);
              if (debugTransform.trim().equals("Y")) {
                  factory.setAttribute("debug", Boolean.TRUE);
              }
          }
  
          return factory.newTemplates(new StreamSource(new StringReader(style.getXmlContent())));
      }
  
      @Override
      public void saveStyle(Style style) {
      	styleRepositoryService.saveStyle(style);
      }
      
     @Override
     public List<String> getAllStyleNames() {
         return styleRepositoryService.getAllStyleNames();
     }
 }