package utils

import (
	"fmt"
	"math/rand"
)

func RandDigits(n uint) string {
	s := ""
	for n != 0 {
		s += fmt.Sprintf("%d", rand.Intn(10))
		n--
	}
	return s
}

const lowerLetter = "abcdefghijklmnopqrstuvwxyz"

func RandLowerString(n int) string {
	b := make([]byte, n)
	for i := range b {
		b[i] = lowerLetter[rand.Intn(len(lowerLetter))]
	}
	return string(b)
}

func GetRandomUserName(base string, len int) string {
	return base + RandDigits(2) + RandLowerString(len)
}

const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"

func RandStringBytes(n int) string {
	b := make([]byte, n)
	for i := range b {
		b[i] = letterBytes[rand.Intn(len(letterBytes))]
	}
	return string(b)
}