private string GetAlgebraicNotation(Square source, Square target, Board board)
{
var sb = new StringBuilder();
var playerTurn = Math.Ceiling(this.Turn / 2.0);
sb.Append(playerTurn + ". ");
if (this.Move.Type == MoveType.EnPassant)
{
var file = source.ToString()[0];
sb.Append(file + "x" + target + "e.p");
}
else if (this.Move.Type == MoveType.Castling)
{
if (target.ToString()[0] == 'g')
{
sb.Append("0-0");
}
else
{
sb.Append("0-0-0");
}
}
else if (this.Move.Type == MoveType.PawnPromotion)
{
sb.Append(target + "=Q");
}
else if (target.Piece == null || target.Piece.Color != source.Piece.Color)
{
if (source.Piece is Pawn)
{
if (target.Piece == null)
{
sb.Append(target);
}
else
{
var file = source.ToString()[0];
sb.Append(file + "x" + target);
}
}
else
{
var targetWithOldIsAttackedValue = board.Matrix.SelectMany(x => x).Where(y => y.Name == target.Name).FirstOrDefault();
if (targetWithOldIsAttackedValue.IsAttacked.Count(piece =>
piece.Color == source.Piece.Color &&
piece.Name.Contains(source.Piece.Name)) > 1)
{
var secondPieceSquare = board.Matrix.SelectMany(x => x).Where(square =>
square.Piece != null &&
square.Piece.Color == source.Piece.Color &&
square.Piece.Name.Contains(source.Piece.Name) &&
square.Name != source.Name).FirstOrDefault();
var xCheck = target.Piece == null ? string.Empty : "x";
if (secondPieceSquare.Position.File.Equals(source.Position.File))
{
var rank = source.Name[1];
if (target.Piece == null)
{
sb.Append($"{source.Piece.Symbol}{rank}{xCheck}{target}");
}
else
{
sb.Append($"{source.Piece.Symbol}{rank}{xCheck}{target}");
}
}
else
{
var file = source.Name[0];
sb.Append($"{source.Piece.Symbol}{file}{xCheck}{target}");
}
}
else
{
var check = target.Piece == null ? string.Empty : "x";
sb.Append($"{source.Piece.Symbol}{check}{target}");
}
}
}
if (this.Opponent.IsCheck)
{
if (!this.Opponent.IsCheckMate)
{
sb.Append("+");
}
else
{
sb.Append("#");
}
}
return(sb.ToString());
}
private void UpdateMoveHistory(Square source, Square target, Board board)
{
string notation = this.GetAlgebraicNotation(source, target, board);
this.OnMoveComplete?.Invoke(this.MovingPlayer, new MoveCompleteEventArgs(notation));
}