package utility

import (
	"crypto/sha512"
	"encoding/hex"
	"io"

	"github.com/google/uuid"
)

func GenerateHashFromReader(r io.Reader) (string, error) {
	h := sha512.New()
	if _, err := io.Copy(h, r); err != nil {
		return "", err
	}

	// return the sha checksum in hex
	return hex.EncodeToString(h.Sum(nil)), nil
	// alternatively return in base64
	//return base64.StdEncoding.EncodeToString(h.Sum(nil)), nil
}

func GenerateSafeName(category MediaType, ext string) string {
	return uuid.New().String() + "_" + string(category) + ext
}