import java.net.*;
import java.io.*;
/*
 Copyright (c) 1995, 1996 Sun Microsystems, Inc. All Rights Reserved.
 
 The protocol that our JokeServer speaks. The code is taken from the
 excellent SUN online Java tutorial and slightly modified.

 */
class JokeHandler 
{
   private static final int WAITING = 0;
   private static final int SENTKNOCKKNOCK = 1;
   private static final int SENTCLUE = 2;
   private static final int ANOTHER = 3;
   private static final int NUMJOKES = 5;

   private int state = WAITING;
   private int currentJoke = 0;
   
   private String clues[] = { "Turnip", "Little Old Lady", "Atch", "Who", "Who" };
   private String answers[] = { "Turnip the heat, it's cold in here!",
                                "I didn't know you could yodel!",
                                "Bless you!",
                                "Is there an owl in here?",
                                "Is there an echo in here?" };

   String processInput(String theInput) 
   {
      String theOutput = null;

      if (state == WAITING) 
      {
         theOutput = "Knock Knock!";
         state = SENTKNOCKKNOCK;
      } 
      else if (state == SENTKNOCKKNOCK) 
      {
         if (theInput.equalsIgnoreCase("Who's There?")) 
         {
            theOutput = clues[currentJoke];
            state = SENTCLUE;
         } 
         else 
         {
            theOutput = "You're supposed to say \"Who's There?\"! Try again. Knock Knock!";
         }
      } 
      else if (state == SENTCLUE) 
      {
         if (theInput.equalsIgnoreCase(clues[currentJoke] + " who?")) 
         {
            theOutput = answers[currentJoke] + " Want another? (y/n)";
            state = ANOTHER;
         } 
         else 
         {
            theOutput = "You're supposed to say \"" + clues[currentJoke] + " who?\"" + "! Try again. Knock Knock!";
            state = SENTKNOCKKNOCK;
         }
      } 
      else if (state == ANOTHER) 
      {
         if (theInput.equalsIgnoreCase("y")) 
         {
            theOutput = "Knock Knock!";
            if (currentJoke == (NUMJOKES - 1))
               currentJoke = 0;
            else
               currentJoke++;
            state = SENTKNOCKKNOCK;
         }  
         else 
         {
            theOutput = "Bye";
            state = WAITING;
         }
      }
      return theOutput;
   }
}