public PositionHistoryItem(
Move.Move move,
Option <int> enPassantCaptureColumn,
CastlingAvailability whiteCastlingAvailability,
CastlingAvailability blackCastlingAvailability)
{
Move = move;
EnPassantCaptureColumn = enPassantCaptureColumn;
WhiteCastlingAvailability = whiteCastlingAvailability;
BlackCastlingAvailability = blackCastlingAvailability;
}
internal void UndoMove()
{
var stateToRestore = history.Last();
history.RemoveAt(history.Count - 1);
PlayerToMove = GetOtherPlayer(PlayerToMove);
Board.UndoMove(stateToRestore.Move, PlayerToMove);
EnPassantCaptureColumn = stateToRestore.EnPassantCaptureColumn;
whiteCastlingAvailability = stateToRestore.WhiteCastlingAvailability;
blackCastlingAvailability = stateToRestore.BlackCastlingAvailability;
}
public void SetCastlingAvailability(
CastlingAvailability castlingAvailability,
Player player)
{
if (player == Player.Black)
{
blackCastlingAvailability = castlingAvailability;
}
else
{
whiteCastlingAvailability = castlingAvailability;
}
}
private CastlingAvailability OptimizeCastlingAvailability(
CastlingAvailability currentFlags,
Player player)
{
if (!IsKingAtInitialSquare(player))
{
return(CastlingAvailability.None);
}
var canCastleShort = currentFlags.CanCastleShort &&
IsRookAtInitialPositionForShortCastle(player);
var canCastleLong = currentFlags.CanCastleLong &&
IsRookAtInitialPositionForLongCastle(player);
return(new CastlingAvailability(canCastleShort, canCastleLong));
}
internal Position(
List <PieceOnBoard> pieces,
Player playerToMove,
CastlingAvailability whiteCastlingAvailability,
CastlingAvailability blackCastlingAvailability,
Option <int> enPassantCaptureColumn,
int halfMoveClock,
int fullMoveNumber)
{
Board = new Board.Board(pieces);
PlayerToMove = playerToMove;
EnPassantCaptureColumn = enPassantCaptureColumn;
HalfMoveClock = halfMoveClock;
FullMoveNumber = fullMoveNumber;
this.whiteCastlingAvailability = OptimizeCastlingAvailability(
whiteCastlingAvailability,
Player.White);
this.blackCastlingAvailability = OptimizeCastlingAvailability(
blackCastlingAvailability,
Player.Black);
}