package utils

import (
	"math"
	"math/rand"
	"strconv"
	"time"
)

const (
	RegPhoneNumber   = `^1[3456789]\d{9}$`
	RegEmailNumber   = `^[a-zA-Z0-9._%+\-]+@[a-zA-Z0-9.\-]+\.[a-zA-Z]{2,}$`
	RegNumberAndChar = `^\w+$`
	RegVersionNumber = `^([1-9]\d|[1-9])(.([1-9]\d|\d)){2}$`
)

func GetInvitation() string {
	var bs = make([]byte, 6)
	for i := 0; i < 6; i++ {
		r := rand.New(rand.NewSource(time.Now().UnixNano()))
		flag := r.Intn(2)
		if flag == 1 {
			bs[i] = byte(rand.Float64()*10 + 48)
		} else {
			bs[i] = byte(rand.Float64()*26 + 65)
		}
	}
	return string(bs)
}

func GetInvitationLen(length int) string {
	var bs = make([]byte, length)
	for i := 0; i < length; i++ {
		r := rand.New(rand.NewSource(time.Now().UnixNano()))
		flag := r.Intn(3)
		if flag == 1 {
			bs[i] = byte(rand.Float64()*10 + 48)
		} else if flag == 0 {
			bs[i] = byte(rand.Float64()*26 + 65)
		} else {
			bs[i] = byte(rand.Float64()*26 + 97)
		}
	}
	return string(bs)
}

func GetInvitationLowerLen(length int) string {
	var bs = make([]byte, length)
	for i := 0; i < length; i++ {
		r := rand.New(rand.NewSource(time.Now().UnixNano()))
		flag := r.Intn(2)
		if flag == 1 {
			bs[i] = byte(rand.Float64()*10 + 48)
		} else {
			bs[i] = byte(rand.Float64()*26 + 97)
		}
	}
	return string(bs)
}

func StringFloat64ToInt(s string) int {
	f1, err := strconv.ParseFloat(s, 64)
	if err != nil {
		return 0
	}
	s1 := strconv.FormatFloat(math.Ceil(f1), 'f', -1, 64)
	i, _ := strconv.Atoi(s1)
	return i
}