import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*; 

import java.util.*; 

public class Two extends HttpServlet {

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

	response.setContentType("text/html"); 
	PrintWriter out = response.getWriter(); 

        String message   = request.getParameter("message"), 
               right     = request.getParameter("right"), 
               total     = request.getParameter("total"), 

               answerkey = request.getParameter("answerkey"), // retrieve state 

               answer = request.getParameter("answer"); // input from user 

        String anotherMessage = ""; 

        if (message != null && ! message.equals("")) { // state is not empty 

          if (answerkey != null && !answerkey.equals("")) { 
            if (answerkey.equals(answer)) { 
              right = (Integer.parseInt(right) + 1) + ""; 
            } 
            total = (Integer.parseInt(total) + 1) + ""; 
          } 

          Vector a = this.explode("--", message); 

          answerkey = (String) a.elementAt(0); a.removeElementAt(0); 

          message = this.implode("--", a); 

          String url = "<img src=\"http://silo.cs.indiana.edu:13539/protected/images/" 
             + answerkey +  ".png\">"; 

          anotherMessage = "You are looking at: " + url + 
             " <input type=text name=answer> <p> ";
 
        } else { // state is empty 

          if (answerkey != null && !answerkey.equals("")) { 
            if (answerkey.equals(answer)) { 
              right = (Integer.parseInt(right) + 1) + ""; 
            } 
            total = (Integer.parseInt(total) + 1) + ""; 
          } 

          Vector a = new Vector(); 

          String[] names = { "China", "Russia", "Italy", "Spain", 
            "South Africa", "Brazil", "United States", "Australia"}; 

          for (int i = 0; i < names.length; i++) a.add(names[i]); 

          Vector b = new Vector();   

          while (a.size() > 0) { 
            int i = (int) (Math.random() * a.size()); 
            b.insertElementAt(a.elementAt(i), 0); 
            a.removeElementAt(i); 
          } 

          if (total != null && !total.equals("") && Integer.parseInt(total) > 0) { 

            anotherMessage = "(" + right + " / " + total + ")"; 

          }

          anotherMessage += " The game has just (re)started. The deck is shuffled."; 

          message = this.implode("--", b); 

          right = "0"; 
          total = "0"; 

          answerkey = ""; 

        } 

	out.println(

"\n  <form> " + 

"\n    " + anotherMessage + " <p> " + 

"\n(" + right + " / " + total + ") Current list: (" + message + ") <p> " + 

"\n    <input type=\"hidden\" name=\"message\"   value=\"" + message + "\"> " + 
"\n    <input type=\"hidden\" name=\"right\"     value=\"" + right + "\"> " + 
"\n    <input type=\"hidden\" name=\"total\"     value=\"" + total + "\"> " + 
"\n    <input type=\"hidden\" name=\"answerkey\" value=\"" + answerkey + "\"> " + 
"\n    Press <input type=\"submit\" value=\"Proceed\"> when ready. " + 
"\n  </form> "

         ); 


    }

    public Vector explode(String delim, String data) {
      Vector v = new Vector(); 
      StringTokenizer st = new StringTokenizer(data, delim); 
      while (st.hasMoreTokens()) {
        v.add(st.nextToken()); 
      } 
      return v; 
    } 

    public String implode(String delim, Vector a) {
        String result = ""; 
        for (int i = 0; i < a.size() - 1; i++) 
          result += a.elementAt(i) + delim; 
        if (a.size() > 0) result += a.elementAt(a.size() - 1); 
        return result; 
    } 
}