routstr-core/ui/lib/hooks/use-display-currency.ts

'use client';

import { useQuery } from '@tanstack/react-query';
import { fetchBtcUsdPrice, btcToSatsRate } from '@/lib/exchange-rate';
import { useCurrencyStore } from '@/lib/stores/currency';

export function useDisplayCurrency() {
  const { displayUnit } = useCurrencyStore();

  const { data: btcUsdPrice } = useQuery({
    queryKey: ['btc-usd-price'],
    queryFn: fetchBtcUsdPrice,
    refetchInterval: 120_000,
    staleTime: 60_000,
  });

  const usdPerSat = btcUsdPrice ? btcToSatsRate(btcUsdPrice) : null;

  return { displayUnit, usdPerSat };
}