import type { PublicStoreInfo } from '@/core/lib/store-info';

/**
 * Server-side twin of `useCurrency()` — call from Server Components,
 * `generateMetadata`, route handlers, and anywhere outside React render
 * (where the client `useStoreInfo()` hook isn't available).
 *
 * Keeps the fallback chain in one place across both client and server.
 *
 * @param storeInfo result of `fetchStoreInfo()` — may be null if the SSR
 *                  fetch failed transiently
 * @param override  pass when the caller already has a specific currency
 *                  (e.g. order-level currency that should win over store)
 */
export function resolveCurrency(
  storeInfo: PublicStoreInfo | null | undefined,
  override?: string | null
): string {
  return override || storeInfo?.currency || process.env.NEXT_PUBLIC_STORE_CURRENCY || 'USD';
}