/*******************************************************************************
 * Copyright (c) 2004 Berthold Daum.
 * 
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     Berthold Daum
 *******************************************************************************
 * Hex-7
 *  Version 2.0
 * www.mazeworks.com
 *
 *  Copyright (c) 2002 David Herzog
 *  All Rights Reserved.
 *******************************************************************************/
package com.bdaum.Hex.game;

import org.eclipse.swt.widgets.Canvas;

import com.bdaum.Hex.views.IStatusListener;

public class Game implements Runnable, IGame {
  
  public static final int SIZE = 7;
  public static final int PLAYER = 0, COMPUTER = 1;


  /* View */
//  private HexView main;
  
  private Canvas canvas;
  private IStatusListener statusListener;

  /* Komponenten */
  private StaticEval stat;
  private Board bd;
  private AI piet;
  private Thread pietMoveThread;

  /* Spielablauf */
  private int playerColor = WHITE, computerColor = BLACK;
  private int level = LEVEL1;
  private boolean playerTurn, gameOver;
  private int ply;
  
  public void setDrawingSurface(Canvas canvas) {
    this.canvas = canvas;
  }
  
  public void setStatusListener(IStatusListener listener) {
    this.statusListener = listener;
  }


  /**
   * Spiel starten
   */
  public void newGame() {
    System.gc();
    stop();
    playerTurn = (playerColor == WHITE) ? true : false;
    gameOver = false;
    ply = 1;
    bd = new Board(canvas, this);
    stat = new StaticEval(bd, this);
    piet = new AI(bd, stat, this);
    bd.draw();
    // white moves first
    if (!playerTurn)
      pietMoveStart();
    else
      statusListener.showMessage("Your Move");
    canvas.setFocus();
  }

  /**
   * Spiel beenden
   */
  private void endGame(
    int side) {
    if (side == COMPUTER) {
      // Computer gewinnt
      if (computerColor == WHITE)
        statusListener.showMessage("White wins");
      else
        statusListener.showMessage("Black wins");
    } else {
      // Spieler gewinnt
      if (playerColor == WHITE)
        statusListener.showMessage("White wins");
      else
        statusListener.showMessage("Black wins");
    }
    gameOver = true;
  }

  /**
   * Spieler zieht
   * 
   * @param i -
   *        Reihe
   * @param j -
   *        Spalte
   */
  private void playerMove(
    int i, int j) {
    if (ply != 1 || i != SIZE / 2 || j != SIZE / 2) {
      if (bd.setHex(i, j, playerColor)) {
        bd.draw();
        if (bd.isWin(playerColor))
          endGame(PLAYER);
        // gefolgt von einem Computer-Zug falls der Spieler nicht gewonnen hat
        else {
          ply++;
          pietMoveStart();
        }
      }
    }
  }

  /**
   * Piet zieht
   */
  private void pietMoveStart() {
    if (pietMoveThread == null) {
      pietMoveThread = new Thread(this);
      pietMoveThread.start();
    }
  }

  /**
   * Thread stoppen
   */
  private void stop() {
    if (pietMoveThread != null) {
      //TODO Das sollte sauber implementiert werden.
      pietMoveThread.stop();
      pietMoveThread = null;
    }
  }

  /**
   * Piets Thread ausf黨ren
   */
  public void run() {
    playerTurn = false;
    statusListener.showMessage("Thinking ...");
    piet.makeMove();
    bd.draw();
    if (bd.isWin(computerColor))
      endGame(COMPUTER);
    else {
      ply++;
      playerTurn = true;
      statusListener.showMessage("Your Move");
    }
    pietMoveThread = null;
  }

  /**
   * Pause
   * 
   * @param ms -
   *        Verz鰃erungszeit in msec
   */
  protected void sleep(
    int ms) {
    try {
      Thread.sleep(ms);
    } catch (InterruptedException e) {
    }
  }

  /**
   * Spielst鋜ke zur點kgeben
   * 
   * @return - Spielst鋜ke
   */
  protected int getLevel() {
    return level;
  }

  /**
   * Farbe ermitteln
   * 
   * @param side -
   *        Spieler oder Piet
   * @return - Farbe
   */
  protected int getColor(
    int side) {
    return (side == PLAYER) ? playerColor : computerColor;
  }

  /**
   * Farbe der Gegenseite ermitteln
   * 
   * @param color -
   *        Farbe
   * @return - Farbe der Gegenseite
   */
  protected int getOtherColor(
    int color) {
    return (color == WHITE) ? BLACK : WHITE;
  }

  /**
   * Zugnummer ermitteln
   * 
   * @return - Zugnummer
   */
  protected int getPly() {
    return ply;
  }

  /**
   * Mausereignis behandeln
   * 
   * @param i -
   *        Reihe
   * @param j -
   *        Spalte
   */
  protected void selectHex(
    int i, int j) {
    if (!gameOver && playerTurn) playerMove(i, j);
  }

  public void setPlayerColor(
    int color) {
    if (gameOver || playerTurn) {
      if ((color == BLACK) && (playerColor == WHITE)) {
        playerColor = BLACK;
        computerColor = WHITE;
      } else if ((color == WHITE) && (playerColor == BLACK)) {
        playerColor = WHITE;
        computerColor = BLACK;
      }
      if (!gameOver) pietMoveStart();
    }
    canvas.setFocus();
  }

  public void setLevel(
    int level) {
    this.level = level;
  }

}