/*
 *  Copyright 2010, Plutext Pty Ltd.
 *   
 *  This file is part of docx4j.

    docx4j is licensed 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.docx4j.convert.out.html;

import java.io.IOException;
import java.util.HashMap;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.TransformerException;

import org.docx4j.XmlUtils;
import org.docx4j.openpackaging.packages.WordprocessingMLPackage;
import org.docx4j.wml.SdtPr;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentFragment;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.traversal.NodeIterator;
import org.xml.sax.SAXException;

/**
 * If the content control has a tag containing @class=foo,
 * then create a div with that attribute and value.
 * 
 * If the value is the special case collapse, ie @class=collapse, 
 * then make this a collapsible div using javascript.
 * 
 * @author jason
 *
 */
public class TagClass extends SdtTagHandler {

	private static Logger log = LoggerFactory.getLogger(TagClass.class);

	/* replaces XSLT:
	 * 
  		<xsl:when test="contains(./w:sdtPr/w:tag/@w:val, '@class=collapse')">
  			<!-- Collapsible -->
  			<xsl:variable name="id" select="string(w:sdtPr/w:id/@w:val)"/>
			<p style="padding-left: 30px;">
			<a onmousedown="toggleDiv('t{$id}');" href="javascript:;">Toggle: 
			<xsl:value-of select="w:sdtPr/w:alias/@w:val"/></a></p>
			
			<!-- collapsed or expanded?  Default is collapsed.  -->
			<xsl:choose>
		  		<xsl:when test="contains(./w:sdtPr/w:tag/@w:val, 'display=block')">
					<div id="t{$id}" style="display: block;">     			
	  					<xsl:apply-templates select="w:sdtContent/*"/>
					</div> 
  				</xsl:when>
		  		<xsl:otherwise>
					<div id="t{$id}" style="display: none;">     			
	  					<xsl:apply-templates select="w:sdtContent/*"/>
					</div> 
  				</xsl:otherwise>  				
			</xsl:choose>
			
  		</xsl:when>
	 * 
	 */

	private Element createDiv(Document document, DocumentFragment docfrag, 
			SdtPr sdtPr,
			HashMap<String, String> tagMap) throws ParserConfigurationException, IOException, SAXException {
		
		// log.info("Document: " + document.getClass().getName() );

		String classVal = tagMap.get("@class");
		
		String sdtId="??";
		if (sdtPr.getId()!=null) sdtId=sdtPr.getId().getVal().toString();

		String sdtAlias = "??";
		SdtPr.Alias alias = this.getAlias(sdtPr);
		if (alias!=null) sdtAlias = alias.getVal();
		
		if (classVal.equals("collapse") ) {				
			XmlUtils.appendXmlFragment(document, docfrag, 
					"<p style=\"padding-left: 30px;\">"
					+ "<a onmousedown=\"toggleDiv('t" + sdtId +"');\" href=\"javascript:;\">Toggle:" + sdtAlias  
					+ "</a></p>"
					);				
		} 
		
		Element xhtmlDiv = document.createElement("div");
		docfrag.appendChild(xhtmlDiv);						
		xhtmlDiv.setAttribute("class", tagMap.get("@class"));
					
		if (classVal.equals("collapse") ) {
			xhtmlDiv.setAttribute("id", "t" + sdtId);
			if (tagMap.get("display")!=null
					&& tagMap.get("display").equals("block")) {
				xhtmlDiv.setAttribute("style", "display: block;");					
			} else {
				xhtmlDiv.setAttribute("style", "display: none;");										
			}
		}			
		
		return xhtmlDiv;
	}
	
	@Override
	public Node toNode(WordprocessingMLPackage wmlPackage, SdtPr sdtPr,
			HashMap<String, String> tagMap,
			NodeIterator childResults) throws TransformerException {

		try {
			// Create a DOM builder and parse the fragment
			Document document = XmlUtils.getNewDocumentBuilder().newDocument();
			DocumentFragment docfrag = document.createDocumentFragment();
			
			Element xhtmlDiv = this.createDiv(document, docfrag, sdtPr, tagMap);
			
			return attachContents(docfrag, xhtmlDiv, childResults);
			
		} catch (Exception e) {
			log.error(e.getMessage(), e);
			throw new TransformerException(e);
		}

	}

		@Override
		public Node toNode(WordprocessingMLPackage wmlPackage, SdtPr sdtPr,
				HashMap<String, String> tagMap,
				Node resultSoFar) throws TransformerException {
			try {
				// Create a DOM builder and parse the fragment
				Document document = XmlUtils.getNewDocumentBuilder().newDocument();
				DocumentFragment docfrag = document.createDocumentFragment();
				
				Element xhtmlDiv = this.createDiv(document, docfrag, sdtPr, tagMap);
				
				return attachContents(docfrag, xhtmlDiv, resultSoFar);
				
			} catch (Exception e) {
				log.error(e.getMessage(), e);
				throw new TransformerException(e);
			}
		}
		
	

}