// Based on version from Kathy Lo

import java.util.*;

public class Eliza
{
    private static Map keywords;
    private static Map startPhrases;
  private static Random random = new Random();
    
    String[] unknowns =
  {
    "Please elaborate on that a little more.",
      "Please, do go on.",
      "I'm not sure I understand what you're getting at.",
      "Why do you think this is so?"
    };
  
    /**
   * Initializes our random number generator and adds keywords to our hashtables
   */
    public Eliza()
  {
    keywords = new HashMap();
    keywords.put("classes", "school");
    keywords.put("apples", "apples");
    keywords.put("you", "me");
    
    startPhrases = new HashMap();
    startPhrases.put("i hate *KEYWORD*", "Why do you hate *KEYWORD* ?");
    startPhrases.put("i have a problem with *KEYWORD*","Is it because of *KEYWORD* that you came to see me?");
    }
  
    /*
   * Processes whatever our patient says.
   */
    public String response( String said )
  {
    String answer = "";
    String curr = "";
    String keystring = "";
    String keyword = "";
    Vector vec = new Vector();
    StringTokenizer patient = new StringTokenizer(said);
    StringTokenizer doctor;
    
    //Build up a search string first
    
    while (patient.hasMoreTokens()) {
      curr = patient.nextToken();
      if (keywords.containsKey(curr)) {
        keyword = (String)keywords.get(curr);
        vec.addElement("*KEYWORD*");
      }
      else
        vec.addElement(curr);
    }
    
    for (Enumeration e = vec.elements(); e.hasMoreElements();
       keystring = keystring + (String)e.nextElement() + " ");
    
    keystring = keystring.trim();
    
    if (startPhrases.containsKey(keystring)) {
      doctor = new StringTokenizer((String)(startPhrases.get(keystring)));
      while (doctor.hasMoreTokens()) {
        curr = doctor.nextToken();
        if (curr.equals("*KEYWORD*"))
          answer = answer + keyword + " ";
        else
          answer = answer + curr + " ";
      }
    }
    else
      answer = unknowns[random.nextInt(unknowns.length)];
    
    return answer;
  }
  
  /**
   * A simple main.
   */
  public static void main(String[] args)
  {
    Eliza e = new Eliza();
    
    System.out.println( e.response("I have to much money.") );
    System.out.println( e.response("Was that not a simple question?") );
  }
}