package utils

import (
	"fmt"
	"net"
)

func ListofA2ZZ() (list []string) {
	for i := 'A'; i <= 'Z'; i++ {
		list = append(list, string(i))
	}
	for i := 'A'; i <= 'Z'; i++ {
		for j := 'A'; j <= 'Z'; j++ {
			list = append(list, string(i)+string(j))
		}
	}
	return
}

func GetLocalIP() (string, error) {
	addrs, err := net.InterfaceAddrs()
	if err != nil {
		return "", err
	}

	for _, addr := range addrs {
		if ipNet, ok := addr.(*net.IPNet); ok && !ipNet.IP.IsLoopback() {
			if ipNet.IP.To4() != nil {
				return ipNet.IP.String(), nil
			}
		}
	}
	return "", fmt.Errorf("no local IP address found")
}