// Gulu - Golang common utilities for everyone.
// Copyright (c) 2019-present, b3log.org
//
// Gulu is licensed under Mulan PSL v2.
// You can use this software according to the terms and conditions of the Mulan PSL v2.
// You may obtain a copy of Mulan PSL v2 at:
//         http://license.coscl.org.cn/MulanPSL2
// THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
// See the Mulan PSL v2 for more details.

package gulu

import (
	"errors"
	"net"
)

// LocalIP gets the first NIC's IP address.
func (*GuluNet) LocalIP() (string, error) {
	addrs, err := net.InterfaceAddrs()

	if nil != err {
		return "", err
	}

	for _, address := range addrs {
		if ipnet, ok := address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
			if nil != ipnet.IP.To4() {
				return ipnet.IP.String(), nil
			}
		}
	}

	return "", errors.New("can't get local IP")
}

// LocalMac gets the first NIC's MAC address.
func (*GuluNet) LocalMac() (string, error) {
	interfaces, err := net.Interfaces()
	if err != nil {
		return "", err
	}

	for _, inter := range interfaces {
		address, err := inter.Addrs()
		if err != nil {
			return "", err
		}

		for _, address := range address {
			// check the address type and if it is not a loopback the display it
			if ipnet, ok := address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
				if ipnet.IP.To4() != nil {
					return inter.HardwareAddr.String(), nil
				}
			}
		}
	}

	return "", errors.New("can't get local mac")
}
