package common

import (
	"fmt"
	"math"
	"net"
)

// GetLocalIP 获取本地内网IP地址
func GetLocalIP() (string, error) {
	adders, err := net.InterfaceAddrs()
	if err != nil {
		return "", err
	}

	for _, addr := range adders {
		if ipnet, ok := addr.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
			if ipnet.IP.To4() != nil {
				return ipnet.IP.String(), nil
			}
		}
	}
	return "", fmt.Errorf("unable to determine local ip")
}

// SplitPower 多维权限拆解
// xyz【1需要 0 不需要】
// SplitPower(1001)=[]bool{true,false,false,true}
func SplitPower(power, num int) []bool {
	boolArr := make([]bool, num)
	for i := 0; i < num; i++ {
		boolArr[num-i-1] = power/int(math.Pow(10, float64(i)))%10 == 1
	}
	return boolArr
}