package utils

import (
	"fmt"
	"strconv"
	"strings"
)

var sizeSuffixes = [...]string{"B", "KiB", "MiB", "GiB", "TiB"}

// ConvertFileSize converts size in bytes down to biggest units it represents.
// Returns converted size, unit and, a concatenation of size and unit
func ConvertFileSize(size int64) (float64, string, string) {
	var idx int
	var fSize float64 = float64(size)

	for idx = 0; fSize >= 1024; fSize /= 1024 {
		idx++
	}

	fSizeStr := strconv.FormatFloat(fSize, 'f', 3, 64)
	fSizeStr = strings.TrimRight(fSizeStr, "0")
	fSizeStr = strings.TrimSuffix(fSizeStr, ".")

	return fSize, sizeSuffixes[idx], fmt.Sprint(fSizeStr, sizeSuffixes[idx])
}