}//PlayTicTacToe()
/// <summary>
/// Turn functionality.
/// If user turn, prompts for row, then column, then attempts to insert at chosen location.
/// If AI turn, generates 2 random integers from 0 to 3 for row and column, then attempts to insert at that location.
/// </summary>
/// <param name="handler">Socket connection is made through.</param>
/// <param name="board">Existing TicTacToeBoard</param>
/// <param name="player">X or O to place</param>
/// <param name="rng">Randum number generator. If null, it is user turn. If it exists, AI turn.</param>
private static void Turn(Socket handler, TicTacToeBoard board, string player, Random rng = null)
{
int row, col, BytesReceived;
byte[] IncomingBuffer = new byte[1024];
bool valid = false;
do //attempt to place token, repeat until valid location chosen
{
if (rng == null) //if rng is null, we're processing player actions
{
//Get row
SendMessage(handler, $"<T>Please enter the row to place an {player}: ");
BytesReceived = handler.Receive(IncomingBuffer);
var x = Encoding.ASCII.GetString(IncomingBuffer, 0, BytesReceived);
row = Int32.Parse(x);
//Get column
SendMessage(handler, $"<T>Please enter the column to place an {player}: ");
BytesReceived = handler.Receive(IncomingBuffer);
col = Int32.Parse(Encoding.ASCII.GetString(IncomingBuffer, 0, BytesReceived));
if (!board.CheckPosition(row, col))
{
HandleInvalid(handler, row, col, player, true);
}
}//if
else //if rng is not null, it's ai move
{
row = rng.Next(0, 3);
col = rng.Next(0, 3);
//Log move to server, whether valid or invalid.
if (!board.CheckPosition(row, col))
{
HandleInvalid(handler, row, col, player, false);
}
else
{
SendMessage(handler, $"<M>Computer played at ({row},{col})");
}
}//else
valid = board.Insert(row, col, player[0]);
} while (!valid);
Console.WriteLine($"GAME EVENT : {player} at ({row},{col})");
}//Turn(Socket, TicTacToeBoard, string, Random)