package main

import (
	"bufio"
	"crypto/md5"
	"encoding/hex"
	"fmt"
	"io"
	"os"
	"os/exec"
	"regexp"
	"strings"
)

func getModelName() string {
	file, err := os.Open("/proc/cpuinfo")
	if err != nil {
		return ""
	}
	defer file.Close()
	scanner := bufio.NewScanner(file)
	re := regexp.MustCompile(`^model name\s*:\s*(.*)$`)
	for scanner.Scan() {
		line := scanner.Text()
		if matches := re.FindStringSubmatch(line); matches != nil {
			return matches[1]
		}
	}
	return ""
}

func getEth0Mac() string {
	out, err := exec.Command("ip", "link").Output()
	if err != nil {
		return ""
	}
	re := regexp.MustCompile(`^(\d+):\s+([a-zA-Z0-9]+):.*<.*>\s+link/ether\s+([0-9a-f:]{17})`)
	matches := re.FindAllStringSubmatch(string(out), -1)
	fmt.Println("Matches:", matches)
	if len(matches) == 0 {
		return ""
	}
	first_device := matches[0][2]
	fmt.Println("First device:", first_device)
	// Get the MAC address of the first device
	out, err = exec.Command("ip", "link", "show", first_device).Output()
	if err != nil {
		return ""
	}
	re = regexp.MustCompile(`ether\s+([0-9a-f:]{17})`)
	match := re.FindStringSubmatch(string(out))
	if match != nil {
		return match[1]
	}
	return ""
}

func getSystemUUID() string {
	out, err := exec.Command("sudo", "dmidecode", "-s", "system-uuid").Output()
	if err != nil {
		return ""
	}
	return strings.TrimSpace(string(out))
}

func md5sum(s string) string {
	h := md5.New()
	io.WriteString(h, s)
	return hex.EncodeToString(h.Sum(nil))
}

func main() {
	uuid := getModelName()
	uuid += getEth0Mac()
	uuid += getSystemUUID()
	fmt.Println(uuid)
	hash := md5sum(uuid)
	fmt.Println(hash)
}