package util

import "net"

func GetHostIPs() ([]net.IP, error) {
	var ips []net.IP

	ifaces, err := net.Interfaces()
	if err != nil {
		return nil, err
	}

	for _, iface := range ifaces {
		// Skip down or loopback interfaces
		if iface.Flags&net.FlagUp == 0 || iface.Flags&net.FlagLoopback != 0 {
			continue
		}

		addrs, err := iface.Addrs()
		if err != nil {
			continue // skip interfaces we can't read
		}

		for _, addr := range addrs {
			var ip net.IP
			switch v := addr.(type) {
			case *net.IPNet:
				ip = v.IP
			case *net.IPAddr:
				ip = v.IP
			}

			// Skip loopback or unspecified
			if ip == nil || ip.IsLoopback() || ip.IsUnspecified() {
				continue
			}

			ips = append(ips, ip)
		}
	}

	return ips, nil
}