package main

import (
	"crypto/md5"
	"encoding/hex"
	"fmt"
	"strconv"
	"time"
)

var (
	HEX_KEY = []int64{0xDF, 0x77, 0xB9, 0x40, 0xb9, 0x9b, 0x84, 0x83, 0xd1, 0xb9, 0xcb, 0xd1, 0xf7, 0xc2, 0xb9, 0x85, 0xc3, 0xd0, 0xfb, 0xc3}
)

func generateMD5(str string) string {
	var hash [16]byte = md5.Sum([]byte(str))
	return hex.EncodeToString(hash[:])
}

func hexString(n int64) string {
	var HEX = strconv.FormatInt(n, 16)
	if len(HEX) < 2 {
		HEX = "0" + HEX
	}
	return HEX
}

func RBIT(num int64) int64 {
	var binData string
	var bin = fmt.Sprintf("%b", num)

	for len(bin) < 8 {
		bin = "0" + bin
	}
	for i := 0; i < 8; i++ {
		binData += string(bin[7-i])
	}
	var data, _ = strconv.ParseInt(binData, 2, 64)
	return data
}

func reverseString(n int64) int64 {
	var hexStr string = hexString(n)
	var hexInt, _ = strconv.ParseInt(hexStr[1:]+hexStr[:1], 16, 64)
	return hexInt
}

func gethashstring(params string, data, cookies string) (string, int64) {
	// fmt.Println(len(data))

	if len(data) == 0 {
		data = "00000000000000000000000000000000"
	} else {
		data = generateMD5(data)
	}

	if len(cookies) == 0 {
		cookies = "00000000000000000000000000000000"
	} else {
		cookies = generateMD5(data)
	}

	MD5 := generateMD5(params) + data + cookies

	var HEX []int64
	var EOR []int64

	var xGorgon string
	xKhronos := time.Now().Unix()

	for i := 0; i < 12; i += 4 {
		for x := 0; x < 4; x++ {
			var H, _ = strconv.ParseInt(
				MD5[8*i : 8*(i+1)][x*2:(x+1)*2], 16, 64,
			)
			HEX = append(HEX, H)
		}
	}
	HEX = append(HEX, 0x0, 0x6, 0xB, 0x1C, (xKhronos&0xFF000000)>>24, (xKhronos&0x00FF0000)>>16, (xKhronos&0x0000FF00)>>8, (xKhronos&0x000000FF)>>0)

	for i := range HEX_KEY {
		EOR = append(EOR, HEX[i]^HEX_KEY[i])
	}
	for i := 0; i < 0x14; i++ {
		EOR[i] = ((RBIT(reverseString(EOR[i])^EOR[(i+1)%0x14]) ^ 0xFFFFFFFF) ^ 0x14) & 0xFF
	}
	for _, value := range EOR {
		xGorgon += hexString(value)
	}
	return "0404b0d30000" + xGorgon, xKhronos

}

// func generateSignature(params string) (string, int64) {
// 	var MD5 string = generateMD5(params) + strings.Repeat("00000000000000000000000000000000", 3)
// 	var HEX []int64
// 	var EOR []int64

// 	var xGorgon string
// 	var xKhronos int64 = time.Now().Unix()

// 	for i := 0; i < 12; i += 4 {
// 		for x := 0; x < 4; x++ {
// 			var H, _ = strconv.ParseInt(MD5[8*i : 8*(i+1)][x*2:(x+1)*2], 16, 64)
// 			HEX = append(HEX, H)
// 		}
// 	}
// 	HEX = append(HEX, 0x0, 0x6, 0xB, 0x1C, (xKhronos&0xFF000000)>>24, (xKhronos&0x00FF0000)>>16, (xKhronos&0x0000FF00)>>8, (xKhronos&0x000000FF)>>0)

// 	for i := range HEX_KEY {
// 		EOR = append(EOR, HEX[i]^HEX_KEY[i])
// 	}
// 	for i := 0; i < 0x14; i++ {
// 		EOR[i] = ((RBIT(reverseString(EOR[i])^EOR[(i+1)%0x14]) ^ 0xFFFFFFFF) ^ 0x14) & 0xFF
// 	}
// 	for _, value := range EOR {
// 		xGorgon += hexString(value)
// 	}
// 	return "0408b0d30000" + xGorgon, xKhronos
// }

func main() {
	// var xgorgon, xKhronos = generateSignature("id=xxx&address_book_access=2&from=0&user_avatar_shrink=188_188&user_cover_shrink=750_422&os_api=25&device_type=SM-G973N&ssmix=a&manifest_version_code=2021901030&dpi=320&carrier_region=IE&uoo=0&region=US&carrier_region_v2=310&app_name=musical_ly&version_name=19.1.3&timezone_offset=7200&ts=1658273727&ab_version=19.1.3&residence=IE&cpu_support64=false&current_region=US&ac2=wifi&ac=wifi&app_type=normal&host_abi=armeabi-v7a&channel=googleplay&update_version_code=2021901030&_rticket=1658267489496&device_platform=android&iid=7121866431746524933&build_number=19.1.3&locale=en&op_region=IE&version_code=190103&timezone_name=Africa%2FHarare&cdid=09caa359-46d5-493c-80c9-ee59809471f0&openudid=0e96eaebc0c2e44f&sys_region=US&device_id=6888243656290108930&app_language=en&resolution=900%2A1600&device_brand=samsung&language=en&os_version=7.1.2&aid=1233&mcc_mnc=310023")
	// fmt.Println(xgorgon, xKhronos)

	fmt.Println(gethashstring("", "x", "x"))

}