package config

import (
	"fmt"
	"net"
)

type Config struct {
	DeviceName string
	Port       string
	LocalIP    string
	FilePath   string
	Version    string
}

var G Config

// 本地ip
func GetLocalIP() (string, error) {
	addrs, err := net.InterfaceAddrs()
	if err != nil {
		return "", err
	}
	var ips []string
	for _, address := range addrs {
		if ipnet, ok := address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
			if ipnet.IP.To4() != nil {
				ips = append(ips, ipnet.IP.String())
			}
		}
	}
	if len(ips) == 0 {
		return "", fmt.Errorf("get local ip failed")
	} else if len(ips) == 1 {
		return ips[0], nil
	} else {
		// Select the one connected to the network
		// when there are multiple network interfaces

		// Is there a better way？
		c, err := net.Dial("udp", "8.8.8.8:80")
		if err != nil {
			return ips[0], nil
		}
		defer c.Close()
		return c.LocalAddr().(*net.UDPAddr).IP.String(), nil
	}

}