package assist

import (
	"bytes"
	"fmt"
	"git.bvbej.com/bvbej/base-golang/pkg/time_parse"
	"math"
	"math/rand"
	"net"
	"regexp"
	"strconv"
	"strings"
	"time"
	"unicode"
)

func GetOrderNumber() string {
	parse, _ := time.Parse(time_parse.CSTLayout, "2021-04-27 00:00:00")
	hours := time.Now().Sub(parse).Hours()
	day := math.Floor(hours / 24)
	prefix := fmt.Sprintf("%05d", int64(day))
	format := time.Now().Format("") + "%0" + strconv.Itoa(10) + "d"
	n := math.Pow10(10)
	return prefix + fmt.Sprintf(format, rand.New(rand.NewSource(time.Now().UnixNano())).Int63n(int64(n)))
}

func ByteFmt(size int64) string {
	var unitArr = []string{"B", "KB", "MB", "GB", "TB", "EB"}
	if size == 0 {
		return "unknown"
	}
	fs := float64(size)
	p := int(math.Log(fs) / math.Log(1024))
	val := fs / math.Pow(1024, float64(p))
	_, frac := math.Modf(val)
	if frac > 0 {
		return fmt.Sprintf("%.1f%s", math.Floor(val*10)/10, unitArr[p])
	} else {
		return fmt.Sprintf("%d%s", int(val), unitArr[p])
	}
}

func UniqueArray[T comparable](array []T) []T {
	result := make([]T, 0, len(array))
	temp := map[T]struct{}{}
	for _, item := range array {
		if _, ok := temp[item]; !ok {
			temp[item] = struct{}{}
			result = append(result, item)
		}
	}
	return result
}

func InArray[T comparable](item T, array []T) bool {
	for _, s := range array {
		if item == s {
			return true
		}
	}
	return false
}

func CurrencyDecimal(value float64) float64 {
	value, _ = strconv.ParseFloat(fmt.Sprintf("%.8f", value), 64)
	return value
}

func IsChinese(str string) bool {
	var count int
	for _, v := range str {
		if unicode.Is(unicode.Han, v) {
			count++
			break
		}
	}
	return count > 0
}

func RandInt(max int) int {
	if max <= 0 {
		return 0
	}
	rand.Seed(time.Now().UnixNano())
	<-time.After(time.Nanosecond)
	return rand.Intn(max)
}

func FindIPv4(input string) string {
	partIp := "(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])"
	must := partIp + "\\." + partIp + "\\." + partIp + "\\." + partIp
	matchMe := regexp.MustCompile(must)
	return matchMe.FindString(input)
}

func RandString(n int) string {
	var letterRunes = []rune("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
	b := make([]rune, n)
	for i := range b {
		b[i] = letterRunes[RandInt(len(letterRunes))]
	}
	return string(b)
}

func IP4ToInt(ip net.IP) int {
	ipSplit := strings.Split(ip.To4().String(), ".")
	var ipInt = 0
	var pos uint = 24
	for _, ipSeg := range ipSplit {
		tempInt, _ := strconv.Atoi(ipSeg)
		tempInt = tempInt << pos
		ipInt = ipInt | tempInt
		pos -= 8
	}
	return ipInt
}

func IP4IntToString(ipInt int) string {
	ipSplit := make([]string, 4)
	var length = len(ipSplit)
	buffer := bytes.NewBufferString("")
	for i := 0; i < length; i++ {
		tempInt := ipInt & 0xFF
		ipSplit[length-i-1] = strconv.Itoa(tempInt)
		ipInt = ipInt >> 8
	}
	for i := 0; i < length; i++ {
		buffer.WriteString(ipSplit[i])
		if i < length-1 {
			buffer.WriteString(".")
		}
	}
	return buffer.String()
}

func CompareVersion(verCurrent, verUpdate string) int {
	versionA := strings.Split(verCurrent, ".")
	versionB := strings.Split(verUpdate, ".")

	for i := len(versionA); i < 4; i++ {
		versionA = append(versionA, "0")
	}
	for i := len(versionB); i < 4; i++ {
		versionB = append(versionB, "0")
	}

	for i := 0; i < 4; i++ {
		version1, _ := strconv.Atoi(versionA[i])
		version2, _ := strconv.Atoi(versionB[i])
		if version1 == version2 {
			continue
		} else if version1 > version2 {
			return 1
		} else {
			return -1
		}
	}

	return 0
}

func GetLocalV4IP() string {
	address, err := net.InterfaceAddrs()
	if err != nil {
		return ""
	}
	for _, addr := range address {
		if it, ok := addr.(*net.IPNet); ok && !it.IP.IsLoopback() {
			if it.IP.To4() != nil {
				return it.IP.String()
			}
		}
	}
	return ""
}