import { useMemo } from 'react';
import { useQuery } from '@tanstack/react-query';
import { getBtcUsdRate, getBtcRates } from '@/lib/exchangeRateService';

/**
 * Hook to fetch and cache BTC/USD exchange rate
 */
export function useExchangeRate() {
  return useQuery({
    queryKey: ['btc-usd-rate'],
    queryFn: getBtcUsdRate,
    staleTime: 60000, // Consider stale after 1 minute
    refetchInterval: 120000, // Refetch every 2 minutes
    retry: 2,
    retryDelay: 1000,
  });
}

/** All BTC → fiat rates (Coinbase) + `sats`. For multi-currency conversion. */
export function useBtcRates() {
  return useQuery({
    queryKey: ['btc-rates'],
    queryFn: getBtcRates,
    staleTime: 60000,
    refetchInterval: 120000,
    retry: 2,
    retryDelay: 1000,
  });
}

/**
 * Hook to convert sats to USD with current exchange rate
 */
export function useSatsToUsd(sats: number | null | undefined) {
  const { data: rate } = useExchangeRate();
  
  return useMemo(() => {
    if (!sats || !rate) return null;
    return (sats / 100000000) * rate;
  }, [sats, rate]);
}

/**
 * Hook to convert USD to sats with current exchange rate
 */
export function useUsdToSats(usd: number | null | undefined) {
  const { data: rate } = useExchangeRate();
  
  return useMemo(() => {
    if (!usd || !rate) return null;
    return Math.floor((usd / rate) * 100000000);
  }, [usd, rate]);
}