import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.Iterator;
import javax.servlet.*;
import javax.servlet.http.*;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.Namespace;
import org.jdom.input.SAXBuilder;
import org.jdom.output.XMLOutputter;

/**
 * Servlet doing Requests and Post commands
 * for creating customers in the Cloud.
 */

public class FlashRegister extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
        doPost(request,response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException   {
        try
        {
            //
            PrintWriter out = response.getWriter();
            HttpSession session = request.getSession(true);
            String userName = request.getParameter("usernamevar");
            String userPass = request.getParameter("passwordvar");
            String userPass2 = request.getParameter("passwordvar2");


            //YOU SHALL NOT TYPE DIFFERENT PASSWORDS
            if (userName.contains("<")) {
                response.setStatus(504);
            } else if (userName.contains(">")) {
                response.setStatus(504);
            } else if (userPass.contains("<")) {
                response.setStatus(504);
            } else if (userPass.contains(">"))  {
                response.setStatus(504);
            } else if (userPass2.contains("<")) {
                response.setStatus(504);
            } else if (userPass2.contains(">")) {
                response.setStatus(504);
            }

            if (userPass.equals(userPass2)) {
                 SAXBuilder builder = new SAXBuilder();
                 Document document = builder.build("C:\\cloud\\users.xml");
                 Element root = document.getRootElement();
                 Element newUser = new Element("user");
                 Element newComp = new Element("competitions");
                 Element newRun = new Element("runs");
                 String newID = null;
                 boolean userNameTaken = false;
            //--------------------------------------
                 Iterator it = root.getChildren("user").iterator();
                    while (it.hasNext()){
                        Element e = (Element) it.next();
                        newID = e.getAttributeValue("id");
                        if (userName.equals(e.getAttributeValue("name").toString()))    {
                            response.setStatus(504);
                            userNameTaken = true;
                        }
                    }

                 if (userNameTaken == false){
                 int conv = Integer.parseInt(newID) + 1;
                 newID = Integer.toString(conv);
                 newUser.setAttribute("name", userName);
                 newUser.setAttribute("password", userPass);
                 newUser.setAttribute("id", newID);
                 newUser.addContent(newComp);
                 newUser.addContent(newRun);
                 root.addContent(newUser);

                 XMLOutputter xmlOUT = new XMLOutputter();
                    FileWriter writer = new FileWriter("C:\\cloud\\users.xml");
                    xmlOUT.output(document, writer);
                    writer.flush();
                    writer.close();
                    response.setStatus(200);
                    //-- Eventuel REDIRECT til FLOWPOW
                 }

            }
        }
        catch(Throwable t)
        {
            t.printStackTrace(System.out);
        }
    }
}