package rep.xml;

import java.io.StringWriter;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

import rep.Session;
import rep.SessionList;
import rep.handler.REPNode;

public class SessionXMLEncoder {
	DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
	TransformerFactory tfactory = TransformerFactory.newInstance(); 

	public String sessionListToXML(SessionList list) {
		/* SessionListをXMLに書き出す。ときの形式
		 * <?xml version="1.0" encoding="UTF-8"?>
		 * <SessionList><host>naha.ie.u-ryukyu.ac.jp</host>
		 * <Session sid="1">
		 *  <Editor eid="1">
		 *   <host>firefly.cr.ie.u-ryukyu.ac.jp</host>
		 *   <port/>
		 *   <file>Test.java</file>
		 *  </Editor>
		 *  <Editor eid="1">
		 *   <host>firefly.cr.ie.u-ryukyu.ac.jp</host>
		 *   <port/>
		 *   <file>Test.java</file>
		 *   </Editor>
		 *   <Editor eid="2">
		 *    <host>teto.cr.ie.u-ryukyu.ac.jp</host>
		 *    <port/>
		 *    </Editor>
		 *   </Session>
		 * </SessionList>
		 */
		StringWriter str = new StringWriter();
		DocumentBuilder builder;
		try {
			builder = factory.newDocumentBuilder();
		} catch (ParserConfigurationException e) {
			return "";
		}
		Document doc = builder.newDocument();
		Element root = doc.getDocumentElement();
		root = doc.createElement("SessionList");
		//					
		//					Element elementSeMaHost = doc.createElement("host");
		//					if(sessionmanagerHost != null) elementSeMaHost.setTextContent(sessionmanagerHost);
		//					root.appendChild(elementSeMaHost);

		for(Session session : list.values()){
			Element elementSession = doc.createElement("Session");
			root.appendChild(elementSession);
			elementSession.setAttribute("sid", Integer.toString(session.getSID()));

			for(REPNode editor : session.getEditorList()){
				Element elementEditor = doc.createElement("Editor");
				elementEditor.setAttribute("eid", Integer.toString(editor.getEID()));
				elementSession.appendChild(elementEditor);

				Element elementHost = doc.createElement("host");
				elementEditor.appendChild(elementHost);
				elementHost.setTextContent(editor.getHost());

				Element elementPort = doc.createElement("port");
				elementEditor.appendChild(elementPort);
				//elementPort.setTextContent(editor.getPort());

				if(editor.getName() != null){
					Element elementName = doc.createElement("file");
					elementEditor.appendChild(elementName);
					elementName.setTextContent(editor.getName());
					//System.out.println(editor.getName());
				}
			}
		}
		doc.appendChild(root);

		Transformer transformer;
		StreamResult result = new StreamResult(str);
		try {
			transformer = tfactory.newTransformer();
			transformer.transform(new DOMSource(doc), result);
		} catch (TransformerConfigurationException e1) {
			return "";
		} catch (TransformerException e) {
			return "";
		} 

		//System.out.println(str.toString());
		return str.toString();
	}
}