import { formatMoney } from "@vmall/shared";
import type { Currency } from "@vmall/shared";

/** Currency-aware money formatter: exponents come from the API, cached app-wide. */
export function useMoney() {
  const { $api } = useNuxtApp();
  const { locale } = useI18n();
  const currencies = useState<Currency[]>("vmall.currencies", () => []);

  async function load(): Promise<void> {
    if (currencies.value.length > 0) return;
    try {
      currencies.value = await $api.listCurrencies();
    } catch {
      /* keep empty; fmt falls back to exponent 2 */
    }
  }

  function fmt(amountMinor: number, currency: string): string {
    const exponent = currencies.value.find((c) => c.code === currency)?.exponent ?? 2;
    return formatMoney(amountMinor, currency, exponent, locale.value);
  }

  return { currencies, load, fmt };
}