ComputerPlayer.java

package tictactoe;

import java.util.ArrayList;
import java.util.Scanner;

public class ComputerPlayer implements Player {
	  public char playerchar;
	  
	  public ComputerPlayer(char c){
			playerchar = c;
		}
	  
	  private ArrayList<int[]> playablemoves(ToeBoard tictac){
		ArrayList<int[]> playable = new ArrayList<int[]>();
		int[] move = new int[2];
		for(int i=0; i<tictac.n; i++){
			for(int j=0; j<tictac.n; j++){
				if(tictac.XOarray[i][j] == '-'){
					move[0] = i;
					move[1] = j;
					//System.out.print("\nPlayable i,j ="+move[0]+"  "+move[1]);
					playable.add(move);
					}
			}
		}
		return playable;
	 }
	  private void checkplayable(ToeBoard tictac){

		int[] move = new int[2];
		  ArrayList<int[]> playable = new ArrayList<int[]>();
		  playable = playablemoves(tictac);
		  System.out.println(playable.size());
		  for(int i=0; i<playable.size(); i++){
					move = playable.get(i);
					System.out.println("\n"+move[0]+"   "+move[1]);
				}
			}
	  
	  
	  private WinDrawLose returnmoveoutcome(ToeBoard tictac, char playerchar){
			//System.out.println("Remember to input your move in terms of the row and column that you want to place your character in.");
			
		
			char nextplayerchar = 'O';
			if(playerchar == 'O'){
				 nextplayerchar = 'X';
			}
			WinDrawLose bestOutcome = null;
			
			int[] move = new int[2];
		
			ArrayList<int[]> playable = new ArrayList<int[]>();
			playable = playablemoves(tictac);
			int movesleft = playable.size();
			ToeBoard[] boardsaftermove = new ToeBoard[movesleft];
			int[][] moves = new int[playable.size()][2];
			
			//System.out.println("\n"+playable.size());
			//for(int i=0; i<movesleft; i++){
				//move = playable.get(i);
				//System.out.println(move[0]+"  "+move[1]);
			//}
			for(int i=0; i<movesleft; i++){
				//if(move[0] == 1 && move[1] == 0){
					//System.out.println("\n 1,0 checked!  "+playerchar);
				//}
				//System.out.println(i);
				//boardsaftermove[i].printBoard();
				boardsaftermove[i] = new ToeBoard(tictac);
				move = playable.get(i);
				moves[i][0] = move[0];
				moves[i][1] = move[1];
				boardsaftermove[i].updateboard(move, playerchar);
				if(boardsaftermove[i].checkwin(playerchar, move) == true){
					WinDrawLose outcome = new WinDrawLose(); 
					outcome.move= move;
					outcome.win = true;
					return outcome;
				}
			}
			if(movesleft == 1){
				WinDrawLose outcome = new WinDrawLose(); 
				outcome.move= move;
				outcome.draw = true;
				return outcome;
			}
			for(int i=0; i<movesleft; i++){	
				WinDrawLose nextoutcome = returnmoveoutcome(boardsaftermove[i], nextplayerchar);
				nextoutcome.reverse();
				if (bestOutcome == null || nextoutcome.betterThan(bestOutcome)) {
                          bestOutcome = nextoutcome;
                        }
                }
               

	  // End for loop
               return bestOutcome;	
	  }			
						
						
						
	  public boolean makemove(ToeBoard tictac) {
			
			int[] move = new int[2];
			char otherplayer = 'X';
			if(playerchar == 'X'){
				otherplayer = 'O';
			}
			
			WinDrawLose moveoutcome = new WinDrawLose();
			boolean win = false;
			do{
				moveoutcome = returnmoveoutcome(tictac, playerchar);
				move = moveoutcome.move;
				System.out.println(move[0]+""+move[1]);
			}while(tictac.checkmove(move)==false);
			tictac.updateboard(move, playerchar);
			win = tictac.checkwin(playerchar, move); 
			if(win == true){
					tictac.printBoard();
					System.out.println("\n Sorry,"+otherplayer+", you lost your game of Tic Tac Toe");
					return true;
					}
			else{
				System.out.print("\nThis is my move, human...\n");
				tictac.printBoard();
				return false;
				}
		}
		  
	  
	}