Gets the closest game vehicle color ID from hex (made for UGMP)

main.go

// Credits to https://github.com/lucasb-eyer/go-colorful for the RGB color distance functions
// Credits to https://gist.github.com/CraigChilds94/6514edbc6a2db5e434a245487c525c75 for the Text to Hex conversion

package main

import (
	"bufio"
	"fmt"
	"math"
	"os"
	"strconv"
)

type Hex string

type RGB struct {
	Red, Green, Blue uint8
}

type Color struct {
	Red, Green, Blue float64
}

func (h Hex) Convert() (RGB, error) {
	return Hex2RGB(h)
}

func Hex2RGB(hex Hex) (RGB, error) {
	var rgb RGB
	values, err := strconv.ParseUint(string(hex), 16, 32)

	if err != nil {
		return RGB{}, err
	}

	rgb = RGB{
		Red:   uint8(values >> 16),
		Green: uint8((values >> 8) & 0xFF),
		Blue:  uint8(values & 0xFF),
	}

	return rgb, nil
}

func sq(v float64) float64 {
	return v * v
}

func (c1 Color) DistanceLinearRgb(c2 Color) float64 {
	r1, g1, b1 := c1.LinearRgb()
	r2, g2, b2 := c2.LinearRgb()
	return math.Sqrt(sq(r1-r2) + sq(g1-g2) + sq(b1-b2))
}

func (col Color) LinearRgb() (r, g, b float64) {
	r = linearize(col.Red)
	g = linearize(col.Green)
	b = linearize(col.Blue)
	return
}

func linearize(v float64) float64 {
	if v <= 0.04045 {
		return v / 12.92
	}
	return math.Pow((v+0.055)/1.055, 2.4)
}

func main() {

	vehColors := map[int]string{
		0:   "000000",
		1:   "f5f5f5",
		2:   "2a77a1",
		3:   "840410",
		4:   "263739",
		5:   "86446e",
		6:   "d78e10",
		7:   "4c75b7",
		8:   "bdbec6",
		9:   "5e7072",
		10:  "46597a",
		11:  "656a79",
		12:  "5d7e8d",
		13:  "58595a",
		14:  "d6dad6",
		15:  "9ca1a3",
		16:  "335f3f",
		17:  "730e1a",
		18:  "7b0a2a",
		19:  "9f9d94",
		20:  "3b4e78",
		21:  "732e3e",
		22:  "691e3b",
		23:  "96918c",
		25:  "3f3e45",
		26:  "a5a9a7",
		27:  "635c5a",
		28:  "3d4a68",
		29:  "979592",
		30:  "421f21",
		31:  "5f272b",
		32:  "8494ab",
		33:  "767b7c",
		35:  "5a5752",
		36:  "252527",
		37:  "2d3a35",
		38:  "93a396",
		39:  "6d7a88",
		40:  "221918",
		41:  "6f675f",
		42:  "7c1c2a",
		43:  "5f0a15",
		44:  "193826",
		45:  "5d1b20",
		46:  "9d9872",
		47:  "7a7560",
		48:  "989586",
		49:  "adb0b0",
		50:  "848988",
		51:  "304f45",
		52:  "4d6268",
		53:  "162248",
		54:  "272f4b",
		55:  "7d6256",
		56:  "9ea4ab",
		57:  "9c8d71",
		58:  "6d1822",
		59:  "4e6881",
		60:  "9c9c98",
		61:  "917347",
		62:  "661c26",
		63:  "949d9f",
		64:  "a4a7a5",
		65:  "8e8c46",
		66:  "341a1e",
		67:  "6a7a8c",
		68:  "aaad8e",
		69:  "ab988f",
		70:  "851f2e",
		71:  "6f8297",
		75:  "20202c",
		76:  "a4a096",
		77:  "aa9d84",
		78:  "78222b",
		79:  "0e316d",
		80:  "722a3f",
		81:  "7b715e",
		82:  "741d28",
		83:  "1e2e32",
		84:  "4d322f",
		85:  "7c1b44",
		86:  "2e5b20",
		87:  "395a83",
		88:  "6d2837",
		89:  "a7a28f",
		90:  "afb1b1",
		91:  "364155",
		92:  "6d6c6e",
		93:  "0f6a89",
		94:  "204b6b",
		95:  "2b3e57",
		96:  "9b9f9d",
		97:  "6c8495",
		98:  "4d6000",
		99:  "ae9b7f",
		100: "406c8f",
		101: "1f253b",
		102: "ab9276",
		103: "134573",
		104: "96816c",
		105: "64686a",
		106: "105082",
		107: "a19983",
		108: "385694",
		109: "525661",
		110: "7f6956",
		111: "8c929a",
		112: "596e87",
		113: "473532",
		114: "44624f",
		115: "730a27",
		116: "223457",
		117: "640d1b",
		118: "a3adc6",
		119: "695853",
		120: "9b8b80",
		121: "620b1c",
		122: "5b5d5e",
		123: "624428",
		124: "731827",
		125: "1b376d",
		126: "ec6aae",
		127: "bc0f0f",
		128: "662b2b",
		130: "3e4154",
		131: "454545",
		132: "a11717",
		133: "110d1d",
		134: "8c939a",
		135: "a1a1a1",
		136: "842827",
		138: "667292",
		139: "2e2e2e",
		140: "640d1a",
		141: "737373",
		143: "371002",
		144: "2d683e",
		145: "1b1b1b",
		146: "d57433",
		147: "141414",
		148: "9f2020",
		149: "ff9800",
		154: "b87c26",
		155: "d35733",
		164: "8c7b6b",
		165: "515459",
		166: "585853",
		167: "646464",
		170: "601a23",
		172: "3b3b4b",
		175: "9e94a9",
		176: "050505",
		179: "b3363a",
		182: "f3ed47",
		186: "352224",
		187: "5a2124",
		189: "63322e",
		191: "8a3a42",
		192: "682731",
		193: "8b3c44",
		194: "9e2f2b",
		195: "a33a2f",
		196: "d25633",
		197: "925635",
		198: "f4723a",
		200: "e25a59",
		201: "772a25",
		202: "e17743",
		203: "c44636",
		204: "e17844",
		205: "c35938",
		206: "464840",
		207: "747761",
		208: "757763",
		209: "918a3d",
		210: "948c66",
		211: "998d79",
		212: "d8a534",
		213: "c9bd7d",
		214: "c9c591",
		215: "d4c84e",
		216: "1a332e",
		217: "242f2b",
		218: "1d373f",
		219: "3c4a3b",
		220: "2d5037",
		221: "3a6c60",
		222: "3a623c",
		223: "7ca282",
		224: "4c524e",
		225: "56775b",
		226: "1c4650",
		227: "485e84",
		228: "1c2745",
		229: "1f3468",
		230: "2b4878",
		231: "475c83",
		232: "447c92",
		233: "3d67ab",
		234: "4b7d82",
		235: "80b0b7",
		236: "3d2333",
		237: "1c2948",
		238: "343941",
		239: "40454c",
		240: "4a2d2b",
		241: "563e33",
		242: "41464c",
		243: "672731",
		244: "835a75",
		245: "868587",
		246: "171717",
		249: "5c5c5c",
		251: "8a8a8a",
		253: "b8b8b8",
		254: "cfcfcf",
		255: "e6e6e6",
		256: "aaafaa",
		257: "6a736b",
		258: "ffef64",
		259: "9aa790",
		262: "6877dc",
		263: "dc5056",
		264: "4a7288",
		265: "dfcb62",
	}

	var main RGB
	var err error
	var index int

	fmt.Printf("-------------------\n")
	fmt.Printf("Insert color hex (RRGGBB)\n")
	scanner := bufio.NewScanner(os.Stdin)
	for scanner.Scan() {
		distance := 99999.0
		index = 0
		text := scanner.Text()
		var hex Hex = Hex(text)
		main, err = hex.Convert()

		if err != nil {
			fmt.Printf("(1) Couldn't convert hex to rgb\n")
		}

		for k := 1; k < len(vehColors); k++ {
			if _, ok := vehColors[k]; !ok {
				continue
			}

			var rgb RGB
			c1 := Color{float64(main.Red) / 255.0, float64(main.Green) / 255.0, float64(main.Blue) / 255.0}
			hex = Hex(vehColors[k])
			rgb, err = hex.Convert()
			if err != nil {
				fmt.Printf("(2) Couldn't convert hex to rgb\n")
			}
			c2 := Color{float64(rgb.Red) / 255.0, float64(rgb.Green) / 255.0, float64(rgb.Blue) / 255.0}

			tempDistance := c2.DistanceLinearRgb(c1) * 100.0
			if tempDistance <= distance {
				distance = tempDistance
				index = k
			}
		}

		fmt.Printf("%s (%d) is the closest color to %v\n", vehColors[index], index, text)

		fmt.Printf("-------------------\n")
		fmt.Printf("Insert color hex (RRGGBB)\n")
	}
}