package class Pawn: Piece {
	package var kind: Kind = .Pawn
	package weak var board: Board?
	package var color: Color
	package var position: Square.Position
	package var pseudoLegalPositions: [Square.Position] {
		return []
	}
	package var legalPositions: [Square.Position] {
		return pseudoLegalPositions.filter { isLegal(pos: $0) }
	}

	package var unicodeRepresentation: String {
		return color == .Black ? "♟" : "♙"
	}

	package func move(dst: Square.Position) -> Bool {
		guard board != nil else {
			return false
		}

		if !(legalPositions.contains { $0 == dst }) {
			return false
		}

		if let board = board, var s = board[position], var d = board[dst] {
			s.piece = self
			d.piece = nil
		}

		position = dst

		return true
	}

	package func isLegal(pos: Square.Position) -> Bool {
		// TODO: Handle "En-Passant"
		if let board = board, let s = board[pos] {
			if let p = s.piece {
				if p.color == color { return false }
			}

		}
		return true
	}

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