/*

 Copyright (c) [2023] [pcm]
 [pcm-coordinator] is licensed under Mulan PSL v2.
 You can use this software according to the terms and conditions of the Mulan PSL v2.
 You may obtain a copy of Mulan PSL v2 at:
          http://license.coscl.org.cn/MulanPSL2
 THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 EITHER EXPaRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 See the Mulan PSL v2 for more details.

*/

package utils

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

const (
	CHARSET    = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"
	TIMEFORMAT = "20060102150405"
)

func RandomString(n int) string {
	sb := strings.Builder{}
	sb.Grow(n)
	for i := 0; i < n; i++ {
		sb.WriteByte(CHARSET[rand.Intn(len(CHARSET))])
	}
	return sb.String()
}

func TimeString() string {
	return time.Now().Format(TIMEFORMAT)
}