package utils

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

func GenerateRandomString(length int) string {

	rand.Seed(time.Now().UnixNano())
	chars := "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"
	b := make([]byte, length)
	for i := range b {
		b[i] = chars[rand.Intn(len(chars))]
	}
	return string(b)
}

func ByteSizeToString(size uint64) string {
	const (
		B  = 1
		KB = 1024 * B
		MB = 1024 * KB
		GB = 1024 * MB
		TB = 1024 * GB
	)

	var unit string
	var value float64

	switch {
	case size >= TB:
		value = float64(size) / TB
		unit = "TB"
	case size >= GB:
		value = float64(size) / GB
		unit = "GB"
	case size >= MB:
		value = float64(size) / MB
		unit = "MB"
	case size >= KB:
		value = float64(size) / KB
		unit = "KB"
	default:
		value = float64(size)
		unit = "B"
	}

	return fmt.Sprintf("%.2f %s", value, unit)
}