/**
 *  <PRE>
 *  CGhostAI.java
 *
 *  Revisions: 1.0 Nov. 23, 2002
 *               Created the CGhostAI class
 *
 *  </PRE>
 *
 *  @author <A HREF="mailto:gtg184g@mail.gatech.edu">Jose Manuel Caban</A>
 *  @version Version 1.0, Nov. 23, 2002
 */

import java.util.*;

public class CGhostAI extends CIntelligence implements Constants{
  
  /**
   *This GhostAI uses a more classicPacman-like AI system
   *Considering the fact that pacman isn't Half-Life, we don't need
   *to do any searches to find Pacman, Pacman will eventually run into
   *the ghosts.
   *
   *Basically, if the Ghost "sees" Pacman, that is, Pacman is within the
   *Ghost's Line of Sight, the ghost will increase his speed to equal Pacman's
   *(in this case I'm setting the speeds to be 3,2,1: 3 = Pacman speed,
   *2 = Ghost regular speed, 1 = Ghost zombied speed)
   *and the Ghost will head in Pacman's direction at full speed until pacman 
   *hits a new node (a Pacman hit Node event occurs) where the new direction
   *Pacman chooses will be sent back to the Ghost and the Ghost will return to
   *moving at normal speed (which is slightly slower than pacman but much faster
   *than the speed at which they move when zombied out.
   *
   *@param CNode, the Ghost's current node
   *@param CGhost, the Ghost to be analyzed
   *@param CCoord, pacmans coordinate
   */
  public int doMove(CNode  cLastNode, CGhost cGhost, CCoord cPacPos){
  	int wayToGo;
  	  	  	
  	if(cGhost.getX() == cPacPos.getX()){
  		if(cGhost.getY() < cPacPos.getY()){
  			wayToGo = cLastNode.canMV_DN()?MV_DN:MV_SAMEDIR;
  		}
  		else{
  			wayToGo = cLastNode.canMV_UP()?MV_UP:MV_SAMEDIR;
  		}
  	}
  	
  	else if(cGhost.getY() == cPacPos.getY()){
  		if(cGhost.getX() < cPacPos.getX()){
  			wayToGo = cLastNode.canMV_RIGHT()?MV_RIGHT:MV_SAMEDIR;
  		}
  		else{
  			wayToGo = cLastNode.canMV_LEFT()?MV_LEFT:MV_SAMEDIR;
  		}
  	}
  	else {
  		//if the ghost can't see pacman then
  		Random rando = new Random();
  		wayToGo = rando.nextInt(MV_SAMEDIR);
  	}
  	return wayToGo;  		
  }//end doMove()
  
}// end of class CGhostAI