public bool CanPlay(Piece piece)
{
if (IsOutOfBounds(piece.Position) || IsOccupied(piece.Position))
{
return false;
}
return CapturesOpponentPiecesInAnyDirection(piece);
}
public void Play(Piece piece)
{
if (!CanPlay(piece))
{
throw new InvalidOperationException($"Invalid move for {piece}");
}
pieces.Add(piece);
foreach (var direction in Direction.All())
{
var line = new PiecesInLine(this, piece, direction);
line.FlipOpponents();
}
}
public PiecesInLine(Board board, Piece piece, Direction direction)
{
this.board = board;
this.piece = piece;
this.direction = direction;
}
private bool CapturesOpponentPiecesInAnyDirection(Piece piece)
{
return Direction.All()
.Any(direction => new PiecesInLine(this, piece, direction).CapturesOpponentPieces());
}
private Piece GetNextPiece(Piece thisPiece)
{
return board.GetPiece(direction.AwayFrom(thisPiece.Position));
}