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

import java.util.*; 

public class One extends HttpServlet {

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

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

        String url = "http://www.cs.indiana.edu/classes/a202-dger/fall2005/not" + 
                     "es/flagquiz/images/"; 

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

               key     = request.getParameter("key"), 

               good    = request.getParameter("good"), 
               total   = request.getParameter("total"), 

               b       = request.getParameter("questions"),

               input   = "", 

               answer = request.getParameter("answer"); 

        if (message == null) {

            message = "Welcome to the game, are you ready?"; 

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

            for (int i = 0; i < 100; i++) { 
              int index = (int) (Math.random() * flags.length); 
              int other = (int) (Math.random() * flags.length); 
              String temp = flags[index]; 
              flags[index] = flags[other];
              flags[other] = temp; 
            }
            b = ""; 
            for (int i = 0; i < flags.length; i++) {
              b += flags[i]; 
              if (i < flags.length - 1) b += ","; 
            } 

            good = "0"; 
            total = "0"; 


        } else {

            // grade first, so you can ask a new question 

            if (answer != null) { 
                if (key.equals(answer)) {
                    good = (Integer.parseInt(good) + 1) + ""; 
                } 
                total = (Integer.parseInt(total) + 1) + ""; 
            }

            // now ask a new question 

            StringTokenizer st = new StringTokenizer(b, ","); 
            if (st.hasMoreTokens()) {
                key = st.nextToken(); 
                b = ""; 
                while (st.hasMoreTokens()) {
                    b += st.nextToken();
                    if (st.hasMoreTokens()) b += ",";  
                } 

                input = "\n <img src=\"" + url + key + ".png\"> " + 

                        " is the flag of <input type=text name=answer size=20> <p> "; 

                message = "Score so far: " + good + " out of " + total ; 

            } else { // running out of questions 

            } 
        } 

	out.println(

"\n  <form> " + 
"\n    " + message + " <p> " + 

"\n    " + input + " " + 

"\n    <input type=\"hidden\" name=\"message\" value=\"" + message + "\"> " + 

"\n    <input type=\"hidden\" name=\"questions\" value=\"" + b + "\"> " + 

"\n    <input type=\"hidden\" name=\"key\" value=\"" + key + "\"> " + 

"\n    <input type=\"hidden\" name=\"good\" value=\"" + good + "\"> " + 
"\n    <input type=\"hidden\" name=\"total\" value=\"" + total + "\"> " + 

"\n    Press <input type=\"submit\" value=\"Proceed\"> when ready. " + 
"\n  </form> "

         ); 


    }
}