/// <summary>
/// Revert the last chess draw by restoring the game situation before the draw was made from the chess draws history.
/// </summary>
public void RevertLastDraw()
{
// make sure the chess draws stack is not empty (otherwise throw exception)
if (_drawHistory.Count == 0)
{
throw new InvalidOperationException("There are no draws to be reverted. Stack is empty.");
}
// remove the last chess draw from chess draws history
_drawHistory.Pop();
// create a new chess board and apply all previous chess draws (-> this results in the situation before the last chess draw was applied)
Board = ChessBoard.StartFormation.ApplyDraws(_drawHistory.Reverse().ToList());
// change the side that has to draw
SideToDraw = SideToDraw.Opponent();
}
// TODO: maybe rework this attibute as this is quite "quick n dirty"
#endregion Members
#region Methods
/// <summary>
/// Apply the chess draw to the current game situation on the chess board.
/// Furthermore change the side that has to draw and store the chess draw in the chess draws history (stack).
/// </summary>
/// <param name="draw">The chess draw to be made</param>
/// <param name="validate">Indicates whether the chess draw should be validated</param>
/// <returns>boolean whether the draw could be applied</returns>
public bool ApplyDraw(ChessDraw draw, bool validate = false)
{
var lastDraw = (_drawHistory?.Count > 0) ? (ChessDraw?)_drawHistory.Peek() : null;
bool isDrawValid = !validate || draw.IsValid(Board, lastDraw);
// info: Validate() throws an exception if the draw is invalid -> catch this exception and make use of the exception message
if (isDrawValid)
{
// draw the chess piece
Board = Board.ApplyDraw(draw);
// apply the chess draw to the chess draws history
_drawHistory.Push(draw);
// change the side that has to draw
SideToDraw = SideToDraw.Opponent();
}
return(isDrawValid);
}