/**
 *  Implements a computer player in a board game
 */

import java.awt.*;
import java.awt.event.*;
import javax.swing.Timer;
import java.applet.AudioClip;

public class ComputerPlayer
    implements Player, ActionListener
{
  private BoardGameApplet applet;
  private ChompGame game;
  private ChompBoard board;

  private Timer clock;
  private int clockCount;
  private int moveRow, moveCol;

  private Strategy strategy;
  private AudioClip chompSound;

  public ComputerPlayer(BoardGameApplet applet, ChompGame game, ChompBoard board)
  {
    this.applet = applet;
    this.game = game;
    this.board = board;
    clock = new Timer(250, this);
    strategy = new Strategy();
    chompSound = applet.getAudioClip(applet.getDocumentBase(), "chomp.wav");
  }

  /**
   *   Returns a prompt to be displayed before
   *   the next move of this player
   */
  public String getPrompt()
  {
    return " Hmm... Let me think...";
  }

  /**
   *   Returns a message to be displayed when
   *   this player has won
   */
  public String getWinMessage()
  {
    return " Hurray, I won!";
  }

  /**
   *   Called to initiate this player's next move
   */
  public void makeMove()
  {
    Position pos = strategy.findBestMove(game);
    if (pos == null)
      pos = strategy.findRandomMove(game);

    moveRow = pos.getRow();
    moveCol = pos.getCol();
    clockCount = 5;
    board.setMove(moveRow, moveCol);
    board.setDisplayCount(clockCount);
    clock.start();
  }

  /**
   *   Called automatically when the timer fires a pulse
   *     (to provide visual feedback for the anticipated move, e.g.
   *      flashing the changed squares a few times)
   */
  public void actionPerformed(ActionEvent e)
  {
    if (clockCount > 0)
    {
      board.update(game);
      clockCount--;
    }
    else
    {
      clock.stop();
      game.makeMove(moveRow, moveCol);
      applet.hasMoved();
      chompSound.play();
    }
  }
}