package storage

import (
	"crypto/sha256"
	"fmt"
	"io"
)

type WalkMode int

const (
	Folder WalkMode = iota
	File
	FileFolder
)

type Storage interface {
	Walk(path string, walkMode WalkMode) <-chan string
	Get(path string) (io.Reader, error)
}

func CalculateSHA256(r io.Reader) (string, error) {
	h := sha256.New()
	if _, err := io.Copy(h, r); err != nil {
		return "", err
	}

	return fmt.Sprintf("%x", h.Sum(nil)), nil

}