package daemon

import (
	"crypto/sha256"
	"errors"
	"io"
	"os"

	"github.com/rwinkhart/rcw/wrappers"
)

var Timeout = 300 // seconds for RPC server timeout; configurable

var daemonHash []byte
var globalPassword []byte

// RCWService provides an RPC method.
type RCWService struct{}

// DecryptRequest is the RPC method that decrypts the incoming data using
// the global password and returns the decrypted data
func (h *RCWService) DecryptRequest(encBytes []byte, reply *[]byte) error {
	var err error
	*reply, err = wrappers.Decrypt(encBytes, globalPassword, false)
	if err != nil {
		return err
	}
	return nil
}

// EncryptRequest is the RPC method that encrypts the incoming data using
// the global password and returns the encrypted data
func (h *RCWService) EncryptRequest(decBytes []byte, reply *[]byte) error {
	*reply = wrappers.Encrypt(decBytes, globalPassword, true, false)
	return nil
}

// getFileHash returns the SHA256 hash of the file at the given path.
func getFileHash(path string) ([]byte, error) {
	file, err := os.Open(path)
	if err != nil {
		return nil, errors.New("unable to read path (" + path + ") for hashing: " + err.Error())
	}
	defer file.Close()
	hash := sha256.New()
	io.Copy(hash, file)
	return hash.Sum(nil), nil
}