/*----------------------------------------------------------------------------
  File: Randy.java
  ----------------------------------------------------------------------------*/

import  java.util.Vector;

/**
 * The Randy mouse will use a strategy that moves in a random
 * direction.  Because it is derived from the base class Smarty, it
 * has a memory.
 *
 * @version 1.0 11/11/2000
 *
 * @author Andrew Bridges ... Copyright (c) 2001
 * */

public class Randy extends Smarty
{

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

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

  protected Direction makeAMove()
  {

    /*------------------------------------------------------------------------
      1. See what directions are open then we put them on the spinner.
      ------------------------------------------------------------------------*/

    Vector directionsToChoose = new Vector();

    if (passagewayOpenAt(Direction.North))
      directionsToChoose.addElement(Direction.North);
    if (passagewayOpenAt(Direction.South))
      directionsToChoose.addElement(Direction.South);
    if (passagewayOpenAt(Direction.East))
      directionsToChoose.addElement(Direction.East);
    if (passagewayOpenAt(Direction.West))
      directionsToChoose.addElement(Direction.West);


    /*------------------------------------------------------------------------
      2. If the spinner has no numbers it goes back to the previous room.
      ------------------------------------------------------------------------*/

    if (directionsToChoose.size() == 0)
      return Direction.Retreat;


    /*------------------------------------------------------------------------
      3. If the spinner only has one number than it takes that direction.
      ------------------------------------------------------------------------*/

    if (directionsToChoose.size() == 1)
      return (Direction) directionsToChoose.elementAt(0);


    /*------------------------------------------------------------------------
      4. If there are two or more numbers on the shiner it spins it.
      ------------------------------------------------------------------------*/

    int randomSelection = randomInt(directionsToChoose.size());


    /*------------------------------------------------------------------------
      5. Now return the direction that the spinner landed on.
      ------------------------------------------------------------------------*/

    return (Direction) directionsToChoose.elementAt(randomSelection);


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

  }

} // end of ... Randy class definition