package mycommon

import (
	"errors"
	"git.makemake.in/kzkzzzz/mycommon/mylog"
	"log"
	"math/rand/v2"
	"net"
	"os"
	"runtime/debug"
	"sync"
)

func SafeFn(fn func()) {
	defer func() {
		if err := recover(); err != nil {
			mylog.Errorf("panic: %s\n%s", err, string(debug.Stack()))
		}
	}()

	fn()
}

func SafeGo(fn func()) {
	go func() {
		SafeFn(fn)
	}()
}

// RandRange [min, max] 左右均包含
func RandRange(min, max int) int {
	return rand.IntN(max+1-min) + min
}

var (
	getIpOnce  = &sync.Once{}
	outBoundIp = "127.0.0.1"
)

// GetOutboundIP 获取本机ip
func GetOutboundIP() string {
	getIpOnce.Do(func() {
		conn, err := net.Dial("udp", "223.5.5.5:53")
		if err != nil {
			log.Printf("get outbound ip err: %s", err)
			return
		}
		defer conn.Close()

		localAddr := conn.LocalAddr().(*net.UDPAddr)

		if localAddr.IP != nil {
			outBoundIp = localAddr.IP.String()
		}
	})

	return outBoundIp
}

var (
	getHostNameOnce = &sync.Once{}
	hostName        = "unknown"
)

// GetHostName 获取hostname
func GetHostName() string {
	getHostNameOnce.Do(func() {
		v, err := os.Hostname()
		if err != nil {
			log.Printf("get host name err: %s", err)
			return
		}

		hostName = v
	})

	return hostName
}

func ExistFile(file string) bool {
	_, err := os.Stat(file)
	if err == nil {
		return true
	}

	if errors.Is(err, os.ErrNotExist) {
		return false
	}

	// 其他错误
	return false
}