import java.awt.*;
import java.awt.event.*;

import com.genuts.gameui.*;

/**
 * The behavior of a ball.
 */
public class MovingBall extends MovingSpriteWrapper {

  /**
   * The ball goes right
   */
  private final static int DIRRIGHT = 0;

  /**
   * The ball goes left
   */
  private final static int DIRLEFT = 1;

  /**
   * The ball goes right
   */
  private final static int DIRDOWN = 2;

  /*
   * The ball goes up
   */
  private final static int DIRUP = 3;

  /**
   * X speed
   */
  private int vx;

  /**
   * Y speed
   */
  private int vy;

  /**
   * Direction of the ball
   */
  private int dir = 0;

  /**
   * Is the ball goes in linearly ?
   */
  private boolean linearDir = true;

  /**
   * Does a collision happened with a border ?
   */
  private boolean borderCollision = false;

  /**
   * Direction of the movement.
   *  true  - Clockwise
   *  false - Counter Clockwise
   */
  private boolean clockWise = true;

  public MovingBall(Sprite sprite, int vx, int vy) {
    super(sprite);

    this.vx = vx;
    this.vy = vy;

    setPremode(true);
  }

  /**
   * Get the value of clockWise.
   * @return value of clockWise.
   */
  public boolean isClockWise() {
    return clockWise;
  }
  
  /**
   * Set the value of clockWise.
   * @param v  Value to assign to clockWise.
   */
  public void setClockWise(boolean  v) {
    this.clockWise = v;
  }

  /**
   * Moves the ball.
   */
  public void move(int ticks) {
    if (clockWise) {
      switch (dir) {
      case DIRRIGHT:
	if (!linearDir && (setPosition(getX(), getY()+vy))) {
	  dir = DIRDOWN;
	} else if (!setPosition(getX()+vx, getY())) {
	  if (borderCollision) {
	    linearDir = false;
	  }
	  if (!setPosition(getX(), getY()-vy)) {
	    if (setPosition(getX()-vx, getY())) {
	      dir = DIRLEFT;
	    }
	  } else {
	    dir = DIRUP;
	  }
	}
	break;
      case DIRDOWN:
	if (!linearDir && (setPosition(getX()-vx, getY()))) {
	  dir = DIRLEFT;
	} else if (!setPosition(getX(), getY()+vy)) {
	  if (borderCollision) {
	    linearDir = false;
	  }
	  if (!setPosition(getX()+vx, getY())) {
	    if (setPosition(getX(), getY()-vy)) {
	      dir = DIRUP;
	    }
	  } else {
	    dir = DIRRIGHT;
	  }
	}
	break;
      case DIRLEFT:
	if (!linearDir && (setPosition(getX(), getY()-vy))) {
	  dir = DIRUP;
	} else if (!setPosition(getX()-vx, getY())) {
	  if (borderCollision) {
	    linearDir = false;
	  }
	  if (!setPosition(getX(), getY()+vy)) {
	    if (setPosition(getX()+vx, getY())) {
	      dir = DIRRIGHT;
	    }
	  } else {
	    dir = DIRDOWN;
	  }
	}
	break;
      case DIRUP:
	if (!linearDir && (setPosition(getX()+vx, getY()))) {
	  dir = DIRRIGHT;
	} else if (!setPosition(getX(), getY()-vy)) {
	  if (borderCollision) {
	    linearDir = false;
	  }
	  if (!setPosition(getX()-vx, getY())) {
	    if (setPosition(getX(), getY()+vy)) {
	      dir = DIRDOWN;
	    }
	  } else {
	    dir = DIRLEFT;
	  }
	}
	break;
      }
    } else {
      switch (dir) {
      case DIRRIGHT:
	if (!linearDir && (setPosition(getX(), getY()-vy))) {
	  dir = DIRUP;
	} else if (!setPosition(getX()+vx, getY())) {
	  if (borderCollision) {
	    linearDir = false;
	  }
	  if (!setPosition(getX(), getY()+vy)) {
	    if (setPosition(getX()-vx, getY())) {
	      dir = DIRLEFT;
	    }
	  } else {
	    dir = DIRDOWN;
	  }
	}
	break;
      case DIRDOWN:
	if (!linearDir && (setPosition(getX()+vx, getY()))) {
	  dir = DIRRIGHT;
	} else if (!setPosition(getX(), getY()+vy)) {
	  if (borderCollision) {
	    linearDir = false;
	  }
	  if (!setPosition(getX()-vx, getY())) {
	    if (setPosition(getX(), getY()-vy)) {
	      dir = DIRUP;
	    }
	  } else {
	    dir = DIRLEFT;
	  }
	}
	break;
      case DIRLEFT:
	if (!linearDir && (setPosition(getX(), getY()+vy))) {
	  dir = DIRDOWN;
	} else if (!setPosition(getX()-vx, getY())) {
	  if (borderCollision) {
	    linearDir = false;
	  }
	  if (!setPosition(getX(), getY()-vy)) {
	    if (setPosition(getX()+vx, getY())) {
	      dir = DIRRIGHT;
	    }
	  } else {
	    dir = DIRUP;
	  }
	}
	break;
      case DIRUP:
	if (!linearDir && (setPosition(getX()-vx, getY()))) {
	  dir = DIRLEFT;
	} else if (!setPosition(getX(), getY()-vy)) {
	  if (borderCollision) {
	    linearDir = false;
	  }
	  if (!setPosition(getX()+vx, getY())) {
	    if (setPosition(getX(), getY()+vy)) {
	      dir = DIRDOWN;
	    }
	  } else {
	    dir = DIRRIGHT;
	  }
	}
	break;
      }
    }
  }

  /**
   * A collision should happen for the current movement.
   */
  protected boolean preCollisionWith(Sprite s) {
    if (s instanceof MovingBall) {
      linearDir = true;
      borderCollision = false;
    } else {
      borderCollision = true;
    }
    return false;
  }
}