/******************************************************************************
 *MachineGoFishPlayer.java                                                    *
 * - artificially intelligent player for go fish game                         *
 * - instantiates knowledge base object to use as basis for decisions         *
 *Author - Graig M. Fisher                                                    *
 *Written March 30, 2001                                                      *
 *****************************************************************************/
 
public class MachineGoFishPlayer extends GoFishPlayer {

  private KnowledgeBase KB;
  private GameDisplay display;

  MachineGoFishPlayer(GameDisplay game){
    super();
    display = game;
    KB = new KnowledgeBase();
  }//constructor MachineGoFishPlayer

  //deals with opponents's request for card (and keeps track of it!)
  public Card beRequested(Card check){
    Card temp = checkPair(check);
    if(temp != null){
      hand.remove(temp);
      return temp;
    }//if statement
    else{
      KB.updateOppRequests(check.value);
      return null;
    }//else statement
  }//method be_requested

  //the AI to deal with figuring which card to pick, uses knowledge base
  public Card makeRequest(){
    //get latest size of human's hand from the display to update knowledge
    KB.updateOppHand(display.handList.getItemCount());

    //get latest set of human's pairs from the display to update knowledge
    String[] temp;
    if(display.pairList.getItemCount() > 0)
      temp = display.pairList.getItems();
    else
      temp = new String[0];
    int[] oppositionPairs = new int[temp.length];
    for(int i = 0; i < temp.length; i++)
      oppositionPairs[i] = display.cardConvert(temp[i]).value - 1;
    KB.updateOppPairs(oppositionPairs);

    //calculate best card to request and return it
    int[] humanRequests = KB.getOppRequests();
    oppositionPairs = KB.getOppPairs();
    int j = 0;
    float prob = -10, newProb = -10;
    for(int i = 0; i < 13; i++){
      if(hand.count(i + 1) > 0){
	if(humanRequests[i] > 0)
	  newProb = 1;
	else
	  newProb = ((3 - pairs.count(i + 1) - oppositionPairs[i]) / 
		     (float) KB.getUnknown()) - (KB.getMyRequests()[i] / 
						 (float) 10);
	if(newProb > prob){
	  prob = newProb;
	  j = i;
	}//if statement
      }//if statement
    }//for loop
    Card requestCard = checkPair(new Card(j + 1, 0));
    KB.updateMe(requestCard.value);
    return requestCard;

  }//method makeRequest

}//class MachineGoFishPlayer

/******************************************************************************
 *END OF FILE - MachineGoFishPlayer.java                                      *
 *****************************************************************************/