// OSGOS helper
// =======================================================================================================
// Author: LLC Texnico <main@texnico.ru>
// All rights reserved
// Russia, Chelyabinsk, 2022-2024

package main

import (
	"bytes"
	"math/rand"
	"sync"
	"time"
)

var (
	mutexRandom   sync.Mutex
	counterRandom int64
)

func RandomString(l int) string {
	mutexRandom.Lock()
	counterRandom++
	rand.Seed(time.Now().UTC().UnixNano() + counterRandom)
	var result bytes.Buffer
	var temp string
	for i := 0; i < l; {
		t := RandInt(0, 3)
		if t == 1 {
			temp = string(rune(RandInt(48, 58)))
		} else if t == 2 {
			temp = string(rune(RandInt(65, 91)))
		} else {
			temp = string(rune(RandInt(97, 123)))
		}
		result.WriteString(temp)
		i++
	}
	mutexRandom.Unlock()
	return result.String()
}

func RandomStringOnlyAlphabetic(l int) string {
	mutexRandom.Lock()
	counterRandom++
	rand.Seed(time.Now().UTC().UnixNano() + counterRandom)
	var result bytes.Buffer
	var temp string
	for i := 0; i < l; {
		t := RandInt(0, 2)
		if t == 1 {
			temp = string(rune(RandInt(97, 123)))
		} else {
			temp = string(rune(RandInt(65, 91)))
		}
		result.WriteString(temp)
		i++
	}
	mutexRandom.Unlock()
	return result.String()
}

func RandFloat(min float64, max float64) float64 {
	return min + rand.Float64()*(max-min)
}

func RandInt(min int, max int) int {
	return min + rand.Intn(max-min)
}