/*
 * 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.openmeetings.app.documents;

import java.io.File;
import java.io.FileWriter;

import org.dom4j.Document;
import org.dom4j.io.XMLWriter;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.Node;
import org.dom4j.io.SAXReader;

public class InstallationDocumentHandler {
	
	public static final String installFileName = "install.xml";
	
	private static InstallationDocumentHandler instance;

	private InstallationDocumentHandler() {}

	public static synchronized InstallationDocumentHandler getInstance() {
		if (instance == null) {
			instance = new InstallationDocumentHandler();
		}
		return instance;
	}
	
	public void createDocument(String filePath, Integer stepNo) throws Exception {
		
		Document document = DocumentHelper.createDocument();
		
		Element root = document.addElement( "install" );
		Element step = root.addElement("step");
		
		step.addElement("stepnumber").addText(stepNo.toString());
		step.addElement("stepname").addText("Step "+stepNo);
		
		XMLWriter writer = new XMLWriter( new FileWriter( filePath ) );
        writer.write( document );
        writer.close();
		
	}
	
	public int getCurrentStepNumber(String filePath) throws Exception{
		
	    SAXReader reader = new SAXReader();
        Document document = reader.read(new File(filePath, InstallationDocumentHandler.installFileName));
        
        Node node = document.selectSingleNode( "//install/step/stepnumber" );
        
        return Integer.valueOf(node.getText()).intValue();
        
	}
	
	
}