tictactoedemo

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()
        {
            int x;
            x = Int32. Console.ReadLine();

            int y;


            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 || 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];

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

                return true;
            }
        }

    }

    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); //
        }
    }
}