import { createHash } from 'node:crypto'

/**
 * Generates a deterministic hex identifier for a device (URL-safe, 24 chars)
 */
export function getDeviceHashIdentifier(device: {
  oui: string
  productClass: string
  serialNumber: string
  manufacturer?: string
}): string {
  const manufacturer = device.manufacturer ?? ''
  const canonical = `${manufacturer}-${device.oui}-${device.productClass}-${device.serialNumber}`
  return createHash('sha256').update(canonical).digest('hex').substring(0, 24)
}