private void RevertBoardState(BoardDifference diff)
{
var(x, y) = diff.PreviousPositionOfSpace;
var value = board.GetItem(x, y);
if (value == -1)
{
return;
}
board.SetItem(x, y, 0);
board.BlankPosition = diff.PreviousPositionOfSpace;
var(_x, _y) = diff.PositionOfSpace;
board.SetItem(_x, _y, value);
}
public void ExecuteCommand(ICommand command)
{
var saveToHistory = command.Execute();
if (saveToHistory)
{
var previousPositionOfSpace = board.BlankPosition;
var memento = new BoardDifference
{
PositionOfSpace = board.BlankPosition,
PreviousPositionOfSpace = previousPositionOfSpace
};
history.Push(memento);
}
else
{
history.Clear();
}
}
