public void Play(char symbol, int x, int y)
{
//if first move
if (_lastSymbol == ' ')
{
//if player is X
if (symbol == 'O')
{
throw new Exception("Invalid first player");
}
}
//if not first move but player repeated
else if (symbol == _lastSymbol)
{
throw new Exception("Invalid next player");
}
//if not first move but play on an already played tile
else if (_board.TileAt(x, y).Symbol != ' ')
{
throw new Exception("Invalid position");
}
// update game state
_lastSymbol = symbol;
_board.AddTileAt(symbol, x, y);
}
public void Play(char symbol, int rowIndex, int columnIndex)
{
EnsureFirstPlayerIsX(symbol);
EnsureCorrectPlayer(symbol);
EnsureValidPosition(rowIndex, columnIndex);
_lastSymbol = symbol;
_board.AddTileAt(symbol, rowIndex, columnIndex);
}