package tools

import (
	"fmt"
	"net"
	"time"
)

func IsPortInUse(port int) bool {
	if conn, err := net.DialTimeout("tcp", net.JoinHostPort("", fmt.Sprintf("%d", port)), 3*time.Second); err == nil {
		conn.Close()
		return true
	}
	return false
}

func LocalIP() string {
	ip := ""
	if addrs, err := net.InterfaceAddrs(); err == nil {
		for _, addr := range addrs {
			if ipnet, ok := addr.(*net.IPNet); ok && !ipnet.IP.IsLoopback() && !ipnet.IP.IsMulticast() && !ipnet.IP.IsLinkLocalUnicast() && !ipnet.IP.IsLinkLocalMulticast() && ipnet.IP.To4() != nil {
				ip = ipnet.IP.String()
			}
		}
	}
	return ip
}