public IEnumerable<Move> GetPossibleMoves(Board board)
{
var result = new List<Move>();
short x = -1;
short y = -1;
for (x = -1; x <= 1; x++)
{
for (y = -1; y <= 1; y++)
{
if (!(x == 0 && y == 0))
{
TryMoveToSquare(board, result, new Move(this.Location, new Coordinate(Location.X + x, Location.Y + y)), MoveType.CanAttack);
}
}
}
if (!HasMoved)
{
// Can't move to escape check
if (!IsUnderAttack(board))
{
var oneRight = new Coordinate(Location.X + 1, Location.Y);
var twoRight = new Coordinate(Location.X + 2, Location.Y);
var rook = board.GetPiece((short)(Location.X + 3), Location.Y);
if(board.GetPiece(oneRight.X, oneRight.Y) == null && board.GetPiece(twoRight.X, twoRight.Y) == null &&
rook != null && rook.PieceType == PieceType.Rook && rook.HasMoved == false)
{
if(!board.CheckMoveForCheck(new Move(Location, oneRight)) &&
!board.CheckMoveForCheck(new Move(Location, twoRight)))
{
result.Add(new Move(Location, twoRight, rook.Location, oneRight));
}
}
var oneLeft = new Coordinate(Location.X - 1, Location.Y);
var twoLeft = new Coordinate(Location.X - 2, Location.Y);
var threeLeft = new Coordinate(Location.X - 3, Location.Y);
rook = board.GetPiece((short)(Location.X - 4), Location.X);
if (board.GetPiece(oneLeft.X, oneLeft.Y) == null && board.GetPiece(twoLeft.X, twoLeft.Y) == null && board.GetPiece(threeLeft.X, threeLeft.Y) == null
&& rook != null && rook.PieceType == PieceType.Rook && rook.HasMoved == false)
{
if (!board.CheckMoveForCheck(new Move(Location, oneLeft)) &&
!board.CheckMoveForCheck(new Move(Location, twoLeft)) &&
!board.CheckMoveForCheck(new Move(Location, threeLeft)))
{
result.Add(new Move(Location, twoLeft, rook.Location, oneLeft));
}
}
}
}
return result;
}
protected MoveResult TryMoveToSquare(Board board, List<Move> possibleMoves, Move move, MoveType moveType)
{
if (move.To.IsValid)
{
var targetPiece = board.GetPiece(move.To.X, move.To.Y);
if (moveType != MoveType.MustAttack && targetPiece == null)
{
if(!board.CheckMoveForCheck(move))
{
possibleMoves.Add(move);
}
return new MoveResult() { Type = MoveResultType.Move };
}
else if(moveType != MoveType.CannotAttack && targetPiece != null && targetPiece.Player != Player)
{
if(!board.CheckMoveForCheck(move))
{
possibleMoves.Add(move);
}
return new MoveResult() { Type = MoveResultType.Attack, CapturedPiece = targetPiece };
}
}
return new MoveResult() { Type = MoveResultType.Invalid };
}
protected MoveResult TryAttackSquare(Board board, Move move)
{
if (move.To.IsValid)
{
var targetPiece = board.GetPiece(move.To.X, move.To.Y);
if(targetPiece != null)
{
if(targetPiece.Player != Player)
{
return new MoveResult() { Type = MoveResultType.Attack, CapturedPiece = targetPiece };
}
}
else
{
return new MoveResult() { Type = MoveResultType.Move };
}
}
return new MoveResult() { Type = MoveResultType.Invalid };
}