package ganserv

import (
	"bufio"
	"fmt"
	"log"
	"os"
	"os/user"
	"runtime"
	"strings"
)

func TryLoadorAskUserForAuthkey() string {
	//Check for zt auth token
	value, exists := os.LookupEnv("ZT_AUTH")
	if !exists {
		log.Println("Environment variable ZT_AUTH not defined. Trying to load authtoken from file.")
	} else {
		return value
	}

	authKey := ""
	if runtime.GOOS == "windows" {
		b, err := os.ReadFile("C:\\ProgramData\\ZeroTier\\One\\authtoken.secret")
		if err == nil {
			log.Println("Zerotier authkey loaded")
			authKey = string(b)
		} else {
			log.Println("Unable to read authkey at C:\\ProgramData\\ZeroTier\\One\\authtoken.secret: ", err.Error())
		}
	} else if runtime.GOOS == "linux" {
		//Try read from source
		b, err := os.ReadFile("/var/lib/zerotier-one/authtoken.secret")
		if err == nil {
			log.Println("Zerotier authkey loaded")
			authKey = string(b)
		} else {
			log.Println("Unable to read authkey at /var/lib/zerotier-one/authtoken.secret: ", err.Error())
		}

	} else if runtime.GOOS == "darwin" {
		b, err := os.ReadFile("/Library/Application Support/ZeroTier/One/authtoken.secret")
		if err == nil {
			log.Println("Zerotier authkey loaded")
			authKey = string(b)
		} else {
			log.Println("Unable to read authkey at /Library/Application Support/ZeroTier/One/authtoken.secret ", err.Error())
		}
	}

	if authKey == "" {
		//Ask user for input
		reader := bufio.NewReader(os.Stdin)
		fmt.Println("Please enter the Zerotier authtoken manually: ")
		input, _ := reader.ReadString('\n')
		return strings.TrimSpace(input)
	}

	return ""
}

func isRoot() bool {
	currentUser, err := user.Current()
	if err != nil {
		return false
	}
	return currentUser.Username == "root"
}