internal final class King: Piece {
	internal weak var board: Board?
	internal var kind: Kind = .King

	internal var unicodeRepresentation: String {
		return color == .Black ? "♛" : "♕"
	}
	internal var color: Color

	internal var position: Square.Position

	internal var pseudoLegalPositions: [Square.Position] {
		return []
	}

	internal var legalPositions: [Square.Position] {
		return pseudoLegalPositions.filter { isLegal(on: $0) }
	}

	internal func move(to dst: Square.Position) -> Bool {
		return false
	}

	internal func isLegal(on pos: Square.Position) -> Bool {
		if let board = board, let s = board[pos] {
			if let p = s.piece {
				if p.color == color { return false }
				if p.kind == .King {
					// TODO: Notify board of check
					return false
				}
			}

		}
		return true
	}

	internal init(color: Color, on position: Square.Position) {
		self.color = color
		self.position = position
	}

}