import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
import { useTranslation } from "react-i18next";
import { toast } from "sonner";

import { exchangeSettingsService } from "@/services/exchangeSettings.service";
import { useErrorHandler } from "@/shared/hooks/useErrorHandler";

const QUERY_KEY = ["exchangeSettings"];

/** One row per foreign currency (USD, DJF, …) — see `exchangeSettingsService.list`. */
export const useExchangeSettingsQuery = () =>
  useQuery({
    queryKey: QUERY_KEY,
    queryFn: () => exchangeSettingsService.list(),
    // Feed health is only interesting while it is being looked at.
    staleTime: 30_000,
    refetchOnWindowFocus: true,
  });

export const useSetExchangeFallbackRate = () => {
  const queryClient = useQueryClient();
  const { t } = useTranslation();
  const { handleError } = useErrorHandler(t);

  return useMutation({
    mutationFn: ({ currency, rate }: { currency: string; rate: number }) =>
      exchangeSettingsService.setFallbackRate(currency, rate),
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: QUERY_KEY });
      toast.success(
        t("exchangeSettings.updated", "Fallback exchange rate updated"),
      );
    },
    onError: handleError,
  });
};