tictactoedemo_todo

using System;

namespace ConsoleAppTicTacToe
{
	public class TicTacToe
	{
		// Private class members
		private char[,] board = new char[3, 3];
		private int currentPlayer;

		private const int CoordinateLimit = 2;

	    private const int playerX = 0; // todo check ENUM
	    private const int playerO = 1;

		private readonly char[] marks = new char[2] {'x', 'o'};

        public TicTacToe()
        {
			Console.WriteLine("Game started!");
			currentPlayer = playerX;
        }

		// Public class functions
		public void displayBoard()
		{
			for(int y = 0; y < board.GetLength(1); y++)
			{
				for(int x = 0; x < board.GetLength(0); x++)
				{
					if ( board[x,y] == 0) // is empty
					{
						Console.Write("- ");
					}
					else
					{
						Console.Write(board[x,y]);
						Console.Write(' ');
					}
				}
				Console.WriteLine();
			}

		}

		public int currentPlayerInt()
		{
			return currentPlayer;
		}

		public string currentPlayerText()
		{
			return (currentPlayer == playerX) ? "Player X" : "Player O";
		}



		/*

		 */

		public bool consoleSelectBox()
		{
			Console.WriteLine("Select box (x,y): ");

			Console.Write("x: ");
			int x = Int32.Parse(Console.ReadLine());

			Console.Write("y: ");
			int y = Int32.Parse(Console.ReadLine());

			return selectBox(x, y);
		}


		/* Selects box by current player

		   Returns true if selected box is valid
		   Returns false if box is already marked
		   Returns false if x or y out of range
		 */
		public bool selectBox(int x, int y)
		{
			// Check if x,y are in range
			if ( (x > CoordinateLimit) || (x < 0) || y > CoordinateLimit )
			{
				Console.WriteLine("Selected index out of range ");
				return false;
			}

			// Check if box is empty
			if ( board[x,y] != 0 )
			{
				Console.WriteLine("This box is already marked!");
				return false;
			}
			else
			{
				board[x,y] = marks[currentPlayer];

				checkWinner();
				// currentPlayer = !currentPlayer;
				if (currentPlayer == playerX)
				{
					currentPlayer = playerO;
				}
				else
				{
					currentPlayer = playerX;
				}
				Console.WriteLine(currentPlayer);
				this.displayBoard();

				return true;
			}
		}

		private bool checkWinner()
		{
			for (int col = 0; col < 3; col++)
			{

			}

			return false;
		}

	}

	public class Program
	{
		public static void Main()
		{
			TicTacToe game = new TicTacToe();
			game.displayBoard();

			Console.WriteLine(game.currentPlayerInt());
			Console.WriteLine(game.currentPlayerText());
			game.selectBox(1,1);

			Console.WriteLine(game.currentPlayerText());
			game.selectBox(1,2);

			Console.WriteLine();
			game.selectBox(1,1); //

			game.consoleSelectBox();
		}
	}
}