internal Move(Move source, PromotionType promotion)
{
Piece = source.Piece;
OriginalPosition = source.OriginalPosition;
NewPosition = source.NewPosition;
CapturedPiece = source.CapturedPiece;
Parameter = new MovePromotion(promotion);
IsCheck = source.IsCheck;
IsMate = source.IsMate;
San = source.San;
}
internal static bool IsValidMove(Move move, ChessBoard board, bool raise, bool checkTurn)
{
if (move is null || !move.HasValue)
{
throw new ArgumentNullException(nameof(move));
}
if (board.pieces[move.OriginalPosition.Y, move.OriginalPosition.X] is null)
{
throw new ChessPieceNotFoundException(board, move.OriginalPosition);
}
if (checkTurn && board.pieces[move.OriginalPosition.Y, move.OriginalPosition.X].Color != board.Turn)
{
return(false);
}
if (move.OriginalPosition == move.NewPosition)
{
return(false);
}
move.Piece = board.pieces[move.OriginalPosition.Y, move.OriginalPosition.X];
move.IsCheck = false;
move.IsMate = false;
move.CapturedPiece = null;
move.San = null;
MovePromotion?promParams = null;
// Promotion result can be already specified so we dont need to invoke event again to ask for prom result
if (move.Parameter is MovePromotion p)
{
promParams = new MovePromotion(p.PromotionType);
}
move.Parameter = null;
bool isValid = IsValidMove(move, board);
// If is not valid => don't validate further
bool isChecked = !isValid || IsKingCheckedValidation(move, move.Piece.Color, board);
if (!isChecked)
{
// Capture
if (board.pieces[move.NewPosition.Y, move.NewPosition.X] is not null &&
board.pieces[move.NewPosition.Y, move.NewPosition.X].Color != move.Piece.Color)
{
move.CapturedPiece = board.pieces[move.NewPosition.Y, move.NewPosition.X];
}
// Promote, Invoke event only when raises == true AND promotion parameters has been not specified yet
if (move.Parameter is MovePromotion promotion)
{
if (promParams != null && promParams.PromotionType != PromotionType.Default)
{
move.Parameter = promParams;
}
else if (raise)
{
var args = new PromotionEventArgs(board);
board.OnPromotePawnEvent(args);
promotion.PromotionType = args.PromotionResult;
}
}
// Check on opposite king
move.IsCheck = IsKingCheckedValidation(move, move.Piece.Color.OppositeColor(), board);
// Opposite king is in (stale)mate
move.IsMate = !PlayerHasMovesValidation(move, move.Piece.Color.OppositeColor(), board);
return(true);
}
else
{
if (isValid && raise)
{
board.OnInvalidMoveKingCheckedEvent(new CheckEventArgs(board, move.Piece.Color == PieceColor.White ? board.WhiteKing : board.BlackKing, true));
}
return(false);
}
}
