//Tic Tac Toe
public class TicTacToe
{
   //copy over your constructor from the Tic Tac Toe Board activity in the previous lesson!
   private int turn;
   private String [][] chess = new String [3][3];

    public TicTacToe()
    {
        for(int i = 0; i < 3; i++)
        {
            for(int a = 0; a < 3; a++)
            {
                chess[i][a] = "-";
            }
        }
    }
   //this method returns the current turn
   public int getTurn()
   {
       return turn;
   }

   /*This method prints out the board array on to the console
   */
   public void printBoard()
   {
       int a = 0;
       System.out.println("  " + "0" + " " + "1" + " " + "2");

       for(int row = 0; row < chess.length; row++)
       {
           System.out.print(a + " ");
           for(int col = 0; col < chess[row].length; col++)
           {
               System.out.print(chess[row][col] + " ");
           }
           a++;
           System.out.println("");
       }
   }

   //This method returns true if space row, col is a valid space
   public boolean pickLocation(int row, int col)
   {
       if(chess[row][col].equals("-"))
       {
           return true;
        }
       else
       {
           return false;
        }
    }

   //This method places an X or O at location row,col based on the int turn
   public void takeTurn(int row, int col)
   {
       if(turn % 2 == 0)
       {
           chess[row][col] = "X";
        }
       else if(turn % 2 == 1)
       {
           chess[row][col] = "O";
        }
       turn++;
    }

   //This method returns a boolean that returns true if a row has three X or O's in a row
   public boolean checkRow()
   {
       boolean a = false;
       for(int row = 0; row < chess.length; row++)
       {
            if(chess[row][0].equals(chess[row][1]) && chess[row][0].equals(chess[row][2]))
            {
                a = true;
            }
        }
       return a;
    }

    //This method returns a boolean that returns true if a col has three X or O's
   public boolean checkCol()
   {
       boolean a = false;
       for(int col = 0; col < chess.length; col++)
       {
            if(chess[0][col].equals(chess[1][col]) && chess[0][col].equals(chess[2][col]))
            {
                a = true;
            }
        }
       return a;
    }

    //This method returns a boolean that returns true if either diagonal has three X or O's
   public boolean checkDiag()
   {
       boolean a = false;
        if(chess[1][1].equals(chess[0][0]) && chess[1][1].equals(chess[2][2]))
        {
            a = true;
        }
        else if(chess[1][1].equals(chess[0][2]) && chess[1][1].equals(chess[2][0]))
        {
            a = true;
        }
        return a;
    }

   //This method returns a boolean that checks if someone has won the game
   public boolean checkWin()
   {
        if(checkRow())
       {
           return true;
        }
       else if(checkCol())
       {
           return true;
        }
       else if(checkDiag())
       {
           return true;
        }
       else
       {
           return false;
        }

    }

}