//go:build darwin

package originclient

import (
	"context"
	"os/exec"
	"regexp"
	"time"
)

var ioregUUIDPattern = regexp.MustCompile(`"IOPlatformUUID" = "([0-9A-Fa-f-]+)"`)

// machineID reads the hardware IOPlatformUUID via ioreg, which is stable
// across reboots and unique per physical/virtual Mac.
func machineID() (string, error) {
	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
	defer cancel()

	out, err := exec.CommandContext(ctx, "ioreg", "-rd1", "-c", "IOPlatformExpertDevice").Output()
	if err != nil {
		return "", err
	}
	match := ioregUUIDPattern.FindSubmatch(out)
	if match == nil {
		return "", errMachineIDUnavailable
	}
	return string(match[1]), nil
}