mana_cost.go

package card

type ManaCost struct {
	Bits uint8
	R    uint8
	G    uint8
	B    uint8
	U    uint8
	W    uint8
	C    uint8
}

// NewManaCost returns an empty mana cost.
func NewManaCost() *ManaCost {
	return &ManaCost{
		Bits: 0,
		C:    0,
		W:    0,
		U:    0,
		B:    0,
		R:    0,
		G:    0,
	}
}

func (mc *ManaCost) SetColorCounts(r uint8, g uint8, b uint8, u uint8, w uint8, c uint8) {
	mc.Bits = calculateSignatureRGBUWC(r, g, b, u, w, c)
	mc.R = r
	mc.G = g
	mc.B = b
	mc.U = u
	mc.W = w
	mc.C = c
}

// CMC returns the converted mana cost.
func (mc *ManaCost) CMC() int8 {
	return 0
}

const R_BITS uint8 = 0b0000_0001
const G_BITS uint8 = 0b0000_0010
const B_BITS uint8 = 0b0000_0100
const U_BITS uint8 = 0b0000_1000
const W_BITS uint8 = 0b0001_0000
const C_BITS uint8 = 0b0010_0000

func calculateSignatureRGBUWC(r uint8, g uint8, b uint8, u uint8, w uint8, c uint8) uint8 {
	return minBits(r)<<0&R_BITS | minBits(g)<<1&G_BITS | minBits(b)<<2&B_BITS | minBits(u)<<3&U_BITS | minBits(w)<<4&W_BITS | minBits(c)<<5&C_BITS
}

func minBits(b uint8) uint8 {
	if 1 < b {
		return 1
	}
	return b
}