public static bool AddIfCoordinateIsEmpty(this List <GameMove> list, Chessboard chessboard, Coordinate from, int i, int j)
{
if (!chessboard.IsCoordinateEmpty(i, j))
{
return(false);
}
list.Add(new GameMove {
From = from, To = Chessboard.GetCoordinate(i, j)
});
return(true);
}
public List <GameMove> GetPawnForwardMoves(Chessboard chessboard, Coordinate fromCoordinate, ChessColor pawnColor)
{
var pawnForwardMoves = new List <GameMove>();
fromCoordinate.ToArrayIndexes(out var fromI, out var fromJ);
var direction = pawnColor == ChessColor.White ? MoveDirection.Upwards : MoveDirection.Down;
var toI = fromI;
var toJ = fromJ;
MoveValidatorExtensions.Move(direction, ref toI, ref toJ);
var forwardMove = new GameMove
{
From = fromCoordinate,
To = Chessboard.GetCoordinate(toI, toJ)
};
switch (fromI)
{
case 1 when pawnColor == ChessColor.White:
case 6 when pawnColor == ChessColor.Black:
{
if (!pawnForwardMoves.AddIfCoordinateIsEmpty(chessboard, forwardMove))
{
return(pawnForwardMoves);
}
MoveValidatorExtensions.Move(direction, ref toI, ref toJ);
pawnForwardMoves.AddIfCoordinateIsEmpty(chessboard, fromCoordinate, toI, toJ);
return(pawnForwardMoves);
}
case 6 when pawnColor == ChessColor.White:
case 1 when pawnColor == ChessColor.Black:
pawnForwardMoves.AddMovesWithAllCastToOptions(forwardMove);
return(pawnForwardMoves);
default:
pawnForwardMoves.Add(forwardMove);
return(pawnForwardMoves);
}
}
public static bool AddIfCoordinateIsValid(
this List <GameMove> list,
Chessboard chessboard,
Coordinate from,
ChessColor chessPieceColor,
int i,
int j)
{
if (!chessboard.IsCoordinateValid(chessPieceColor, i, j))
{
return(false);
}
list.Add(new GameMove {
From = @from, To = Chessboard.GetCoordinate(i, j)
});
return(true);
}
public static void AddIfPawnKills(
this List <GameMove> list,
Chessboard chessboard,
GameMove?previousMove,
Coordinate from,
ChessColor chessPieceColor,
MoveDirection direction)
{
from.ToArrayIndexes(out var i, out var j);
Move(direction, ref i, ref j);
if (!Chessboard.IsCoordinateValid(i, j))
{
return;
}
if (!IsPawnKilling(chessboard, previousMove, chessPieceColor, i, j))
{
return;
}
var toCoordinate = Chessboard.GetCoordinate(i, j);
if (chessPieceColor == ChessColor.White && toCoordinate.Number == 8 ||
chessPieceColor == ChessColor.White && toCoordinate.Number == 1)
{
list.AddMovesWithAllCastToOptions(new GameMove {
From = from, To = toCoordinate
});
}
else
{
list.Add(new GameMove {
From = from, To = toCoordinate
});
}
}