/*----------------------------------------------------------------------------
  File: Goaly.java
  ----------------------------------------------------------------------------*/

import  java.util.Vector;

/**
 * The Goaly mouse will use a strategy that moves in the direction
 * that is closest to the goal.  Because it is derived from the base
 * class Smarty, it has a memory.
 *
 * @version 1.0 12/9/2000
 *
 * @author Andrew Bridges ... Copyright (c) 2001
 * */

public class Goaly extends Smarty
{

  //////////////////////////////////////////////////////////////////////////////
  // makeAMove /////////////////////////////////////////////////////////////////
  //////////////////////////////////////////////////////////////////////////////

  /**
   * For each turn the makeAMove method is called.  The Goaly mouse
   * will use a strategy that moves in the direction that is closest
   * to the goal.
   *
   * @return the direction that we should move.
   * */

  protected Direction makeAMove()
  {

    /*------------------------------------------------------------------------
      Local Variables
      ------------------------------------------------------------------------*/

    Direction dir  = Direction.Retreat;
    double    dist = Double.MAX_VALUE;

    Direction wrkDir  = null;
    double    wrkDist = 0.0;
    

    /*------------------------------------------------------------------------
      1. Test the North direction.
      ------------------------------------------------------------------------*/

    wrkDir  = Direction.North;
    wrkDist = distanceToGoal(wrkDir);
    if (passagewayOpenAt(wrkDir) && wrkDist < dist)
      {
        dir = wrkDir;
        dist = wrkDist;
      }
    

    /*------------------------------------------------------------------------
      2. Test the South direction.
      ------------------------------------------------------------------------*/

    wrkDir  = Direction.South;
    wrkDist = distanceToGoal(wrkDir);
    if (passagewayOpenAt(wrkDir) && wrkDist < dist)
      {
        dir = wrkDir;
        dist = wrkDist;
      }
    

    /*------------------------------------------------------------------------
      3. Test the West direction.
      ------------------------------------------------------------------------*/

    wrkDir  = Direction.West;
    wrkDist = distanceToGoal(wrkDir);
    if (passagewayOpenAt(wrkDir) && wrkDist < dist)
      {
        dir = wrkDir;
        dist = wrkDist;
      }
    

    /*------------------------------------------------------------------------
      4. Test the East direction.
      ------------------------------------------------------------------------*/

    wrkDir  = Direction.East;
    wrkDist = distanceToGoal(wrkDir);
    if (passagewayOpenAt(wrkDir) && wrkDist < dist)
      {
        dir = wrkDir;
        dist = wrkDist;
      }


    /*------------------------------------------------------------------------
      Processing End (makeAMove)
      ------------------------------------------------------------------------*/

    return dir;

  }

} // end of ... Goaly class definition