public class WordGuess extends TwoPlayerGame implements CLUIPlayable
{   private String secretWord;
    private StringBuffer currentWord;
    private int wordLength;
    private int unguessedLetters;

    public WordGuess()
    {   secretWord = getSecretWord();
        wordLength = secretWord.length();
        currentWord = new StringBuffer(secretWord);
        for (int k = 0; k < wordLength; k++)
           currentWord.setCharAt(k,'?');
        unguessedLetters = wordLength;
    } //WordGuess() constructor

    private String getSecretWord()
    {   int num = (int)(Math.random()*10);
        switch (num)
        {   case 0: return "SOFTWARE";
            case 1: return "SOLUTION";
            case 2: return "CONSTANT";
            case 3: return "COMPILER";
            case 4: return "ABSTRACT";
            case 5: return "ABNORMAL";
            case 6: return "ARGUMENT";
            case 7: return "QUESTION";
            case 8: return "UTILIZES";
            case 9: return "VARIABLE";
            default: return "MISTAKES";
        } //switch
    } //getSecretWord()

    /* Returns true if letter is a new correct letter
    in which case the letter is filled into currentWord.
    */
    private boolean guessLetter(char letter)
    {   if (secretWord.indexOf(letter) == -1)
            return false; // letter is not in secretWord
        else // find positions of letter in secretWord
        {   for (int k = 0; k < wordLength; k++)
            {   if (secretWord.charAt(k) == letter)
                {   if (currentWord.charAt(k) == letter)
                        return false; //already guessed
                    currentWord.setCharAt(k,letter);
                    unguessedLetters--; //one less to find
                } //if
            } //for
            return true;
        } //else
    } //guessLetter()

    /** Overridden method from TwoPlayerGame */
    public String getRules()
    {   return "\n*** The Rules of Word Guess ***\n" +
        "(1) The game generates a secret word.\n" +
        "(2) Two players alternate taking moves.\n" +
        "(3) A move consists of guessing a letter in the word.\n" +
        "(4) A player continues guessing until a letter is wrong.\n" +
        "(5) The game is over when all letters of the word are guessed\n" +
        "(6) The player guessing the last letter of the word wins.\n";
    } //getRules()

    /** Implementation of abstract method from TwoPlayerGame */
    public boolean gameOver()
    {   return (unguessedLetters <= 0);
    } // gameOver()

    /** Implementation of abstract method from TwoPlayerGame */
    public String getWinner()
    {   if (gameOver())
	          return "Player " + getPlayer();
        else return "The game is not over.";
    } // getWinner()

    /** Implementation of method from CLUIPlayable */
    public String reportState()
    {   return "\nCurrent word " + currentWord.toString()
            + "\nPlayer " + getPlayer() + " guesses next.";
    } // report()

    /** Implementation of method from CLUIPlayable */
    public String prompt()
    {    return "\nGuess a letter that you think is in the secret word: ";
    } //prompt()

    /** Implementation of method from CLUIPlayable */
    public String move(String s)
    {   if (s.length()==1)
        {   char letter = s.toUpperCase().charAt(0);
            if (guessLetter(letter)) //if correct
            {  return "Yes, the letter " + letter +
                   " IS in the secret word\n";
            } else
            {   changePlayer();
                return "Sorry, " + letter + " is NOT a " +
                    "new letter in the secret word\n";
            } //else
        } //if
        return "Oops. That is an illegal input.\n";
    } //move()

    /*** A WordGuess Application Program
    */
    public static void main(String args[])
    {   WordGuess game = new WordGuess();
        CLUIGamePlayer gp = new CLUIGamePlayer(game);
        gp.play();
    } //main()
    
} //WordGuess class