final class Queen: Piece, LinearMoves, DiagonalMoves {
	override var unicodeRepresentation: String {
		return color == .Black ? "♛" : "♕"
	}

	override var pseudoLegalPositions: [Square.Position] {
		return getDiagonalMoves(from: position) + getLinearMoves(from: position)
	}

	override func getLegalPosition() {
		legalPositions = []
		var last: Square.Position? = nil
		for position in pseudoLegalPositions {
			if !isLegal(on: position) {
				last = position
				continue
			}

			if !LinearDirection.isLegal(last: &last, current: position)
				&& !DiagonalDirection.isLegal(last: &last, current: position)
			{
				last = nil
			}

			if last == nil {
				legalPositions.append(position)
				if let square = delegate?.getSquareInfo(on: position),
					let piece = square.piece
				{
					if piece.color != color {
						if let king = piece as? King {
							delegate?.notify(.kingInCheck(self, on: king))
							legalPositions.removeLast()
						} else {
							delegate?.notify(
								.piecePinned(from: self, on: piece))
						}
						last = position
					}
				}
			}
		}
	}

	override func isLegal(on pos: Square.Position) -> Bool {
		if let s = delegate?.getSquareInfo(on: pos), let p = s.piece,
			p.color == color
		{
			return false
		}
		return true
	}

	init(with color: Color, on position: Square.Position) {
		super.init(kind: .Queen, on: position, with: color)
	}

}