package utils

import (
	"math/rand"
)

func OrderIdRange(OrderId int64) (int64, int64) {
	minOrderId := OrderId //后面有几个零
	var maxStep int64 = 1
	currValue := minOrderId
	for {
		if currValue%10 == 0 {
			currValue = currValue / 10
			maxStep = maxStep * 10
		} else {
			break
		}
	}
	maxOrderId := minOrderId + maxStep - 1
	return minOrderId, maxOrderId
}

// 长度为62
var bytes []byte = []byte("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890")

func RandName(n int) string {
	result := make([]byte, n)
	for i := 0; i < n; i++ {
		result[i] = bytes[rand.Int31()%62]
	}
	return string(result)
}