package windows

import (
	"errors"

	"softbox.local/core/licensing"
)

// ErrMachineFingerprintUnavailable reports that a required identifier could
// not be safely read or normalized. It intentionally contains no source value.
var ErrMachineFingerprintUnavailable = errors.New("machine fingerprint is unavailable")

type machineGUIDReader func() (string, error)
type systemVolumeSerialReader func() (uint32, error)

func machineHashFrom(readMachineGUID machineGUIDReader, readSystemVolumeSerial systemVolumeSerialReader) (string, error) {
	if readMachineGUID == nil || readSystemVolumeSerial == nil {
		return "", ErrMachineFingerprintUnavailable
	}
	machineGUID, err := readMachineGUID()
	if err != nil {
		return "", ErrMachineFingerprintUnavailable
	}
	systemVolumeSerial, err := readSystemVolumeSerial()
	if err != nil {
		return "", ErrMachineFingerprintUnavailable
	}
	machineHash, err := licensing.DeriveMachineHash(machineGUID, systemVolumeSerial)
	if err != nil {
		return "", ErrMachineFingerprintUnavailable
	}
	return machineHash, nil
}