/*
 * $Id: Game.java 3364 2006-07-10 10:33:29Z gbevin $ $Revision: 3364 $
 * $Date: 2006-04-16 15:36:52 +0200 (Sun, 16 Apr 2006) $
 *
 * ==================================================================== Licensed
 * under the Apache License, Version 2.0 (the "License"); you may not use this
 * file except in compliance with the License. You may obtain a copy of the
 * License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package model;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

/**
 * Implementation of the actual hangman game model. The model holds the word
 * generator, the current word, retries remaining and the correctLetters that
 * have been guessed. It also answers questions such as whether all retries have
 * been used.
 *
 * @author Chris Turner
 * @author Jonathan Locke
 * @author Geert Bevin
 */
public class Game implements Serializable {
	/** Number of guesses allowed */
	private int guessesAllowed;
	
	/** Number of guesses remaining */
	private int guessesRemaining;
	
	/** The letters */
	private final List<Letter> letters = new ArrayList<Letter>();
	
	/** The word being guessed by the user */
	private Word word;
	
	/** Word generator */
	private WordGenerator wordGenerator;
	
	/**
	 * Return the number of guesses remaining.
	 *
	 * @return The number of guesses
	 */
	public int getGuessesRemaining() {
		return guessesRemaining;
	}
	
	/**
	 * @return The letters in the game
	 */
	public List<Letter> getLetters() {
		return letters;
	}
	
	/**
	 * Get the current word that is being guessed or has been guessed.
	 *
	 * @return The current word
	 */
	public Word getWord() {
		return word;
	}
	
	/**
	 * Guess the given letter for the current word. If the letter matches then
	 * the word is updated otherwise the guesses remaining counter is reduced.
	 * The letter guessed is also recorded.
	 *
	 * @param letter
	 *            The letter being guessed
	 * @return True if guess was correct
	 */
	public boolean guess(final Letter letter) {
		if (!letter.isGuessed()) {
			final boolean correct = word.guess(letter);
			if (!correct) {
				guessesRemaining--;
			}
			return correct;
		}
		return false;
	}
	
	/**
	 * Check whether the user has used up all of their guesses.
	 *
	 * @return Whether all of the user's guesses have been used
	 */
	public boolean isLost() {
		return guessesRemaining == 0;
	}
	
	/**
	 * Check whether the user has successfully guessed all of the correctLetters
	 * in the word.
	 *
	 * @return Whether all of the correctLetters have been guessed or not
	 */
	public boolean isWon() {
		return word.isGuessed();
	}
	
	/**
	 * Play another game with same settings
	 */
	public void newGame() {
		newGame(guessesAllowed, wordGenerator);
	}
	
	/**
	 * Initialise the hangman read for a new game.
	 *
	 * @param guessesAllowed
	 *            Number of guesses allowed
	 * @param wordGenerator
	 *            The word generator
	 */
	public void newGame(final int guessesAllowed, final WordGenerator wordGenerator) {
		this.guessesAllowed = guessesAllowed;
		this.guessesRemaining = guessesAllowed;
		this.word = wordGenerator.next();
		this.wordGenerator = wordGenerator;
		
		// Add letters
		letters.clear();
		for (char c = 'a'; c <= 'z'; c++) {
			letters.add(new Letter(c));
		}
	}
}