/**
    * 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.edl.impl.xml.export;
  
  import org.apache.log4j.Logger;
  import org.jdom.Element;
  import org.jdom.Namespace;
  import org.kuali.rice.core.api.CoreApiServiceLocator;
  import org.kuali.rice.core.api.impex.ExportDataSet;
  import org.kuali.rice.core.api.style.Style;
  import org.kuali.rice.core.api.style.StyleService;
  import org.kuali.rice.core.api.util.xml.XmlHelper;
  import org.kuali.rice.core.api.util.xml.XmlRenderer;
  import org.kuali.rice.core.framework.impex.xml.XmlExporter;
  import org.kuali.rice.edl.impl.bo.EDocLiteAssociation;
  import org.kuali.rice.edl.impl.bo.EDocLiteDefinition;
  import org.kuali.rice.edl.impl.service.EDocLiteService;
  import org.kuali.rice.edl.impl.service.EdlServiceLocator;
  
  import java.io.StringReader;
  import java.util.Iterator;
  import java.util.List;
  
  import static org.kuali.rice.core.api.impex.xml.XmlConstants.*;
  /**
   * Exports EDocLite definitions to XML.
   *
   * @see EDocLiteDefinition
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class EDocLiteXmlExporter implements XmlExporter {
  
  	private static final Logger LOG = Logger.getLogger(EDocLiteXmlExporter.class);
  
  	private XmlRenderer renderer = new XmlRenderer(EDL_NAMESPACE);
  
  	@Override
  	public boolean supportPrettyPrint() {
  		return false;
  	}
  	
  	public Element export(ExportDataSet exportDataSet) {
  		EdlExportDataSet dataSet = EdlExportDataSet.fromExportDataSet(exportDataSet);
  		if (!dataSet.getEdocLites().isEmpty()) {
  			Element rootElement = renderer.renderElement(null, EDL_EDOCLITE);
  			rootElement.setAttribute(SCHEMA_LOCATION_ATTR, EDL_SCHEMA_LOCATION, SCHEMA_NAMESPACE);
  			// create output in order of all edl followed by all stylesheets, followed by all associations, this is so multiple edoclite's can be ingested in a single xml file.
  			List<EDocLiteAssociation> assocList = dataSet.getEdocLites();
  			// loop thru same list 3 times.
  			for (EDocLiteAssociation e : assocList) {
  				exportEdlDefinitions(rootElement, e);
  			}
  			for (EDocLiteAssociation e : assocList) {
  				exportStyles(rootElement, e);
  			}
  			for (EDocLiteAssociation e : assocList) {
  				exportAssociations(rootElement, e);
  			}
  			return rootElement;
  		}
  		return null;
  	}
  
  	private void exportEdlDefinitions(Element parentEl, EDocLiteAssociation edl) {
  
  		try {
  			EDocLiteService edlService = EdlServiceLocator.getEDocLiteService();
  			if (edl.getDefinition() != null) {  //this probably shouldn't be supported on the entry side...
  				EDocLiteDefinition def = edlService.getEDocLiteDefinition(edl.getDefinition());
  				if (def == null) {
  					LOG.error("Attempted to export definition " + edl.getDefinition() + " which was not found");
  					return;
  				}
  				Element defEl = XmlHelper.buildJDocument(new StringReader(def.getXmlContent())).getRootElement();
  				setNamespace(defEl, EDL_NAMESPACE);
  				parentEl.addContent(defEl.detach());
  			}
  		} catch (Exception e) {
  			throw new RuntimeException(e);
  		}
  	}
  	
  	private void exportStyles(Element parentEl, EDocLiteAssociation edl) {
  
  		try {
 			StyleService styleService = CoreApiServiceLocator.getStyleService();
 
 			if (edl.getStyle() != null) {//this probably shouldn't be supported on the entry side...
 				Element styleWrapperEl = renderer.renderElement(parentEl, EDL_STYLE);
 				renderer.renderAttribute(styleWrapperEl, "name", edl.getStyle());
 				Style style = styleService.getStyle(edl.getStyle());
 				if (style == null) {
 					LOG.error("Attempted to export style " + edl.getStyle() + " which was not found");
 					return;
 				}
 				Element styleEl = XmlHelper.buildJDocument(new StringReader(style.getXmlContent())).getRootElement();
 				styleWrapperEl.addContent(styleEl.detach());
 			}
 		} catch (Exception e) {
 			throw new RuntimeException(e);
 		}
 	}
 	
 	private void exportAssociations(Element parentEl, EDocLiteAssociation edl) {
 		try {
 			Element associationEl = renderer.renderElement(parentEl, EDL_ASSOCIATION);
 			renderer.renderTextElement(associationEl, EDL_DOC_TYPE, edl.getEdlName());
 			if (edl.getDefinition() != null) {
 				renderer.renderTextElement(associationEl, EDL_DEFINITION, edl.getDefinition());
 			}
 			if (edl.getStyle() != null) {
 				renderer.renderTextElement(associationEl, EDL_STYLE, edl.getStyle());
 			}
 
 			renderer.renderTextElement(associationEl, EDL_ACTIVE, edl.getActiveInd().toString());
 		} catch (Exception e) {
 			throw new RuntimeException(e);
 		}
 	}
 
 	private void setNamespace(Element element, Namespace namespace) {
 		element.setNamespace(namespace);
 		for (Iterator iter = element.getChildren().iterator(); iter.hasNext();) {
 			setNamespace((Element)iter.next(), namespace);
 		}
 	}
 }