import { useEffect, useRef } from "react";
import { useTranslation } from "react-i18next";
import { accountSwitchNotice } from "./entryUrl";
import { notify } from "./notifications";

/** Say, once per load, what the entry URL tells the account signed in here about a switch of
 * account (`accountSwitchNotice`): a sign-in as someone else the server refused, or a tab that
 * reloaded because another account signed in under it. It waits for the account — until it is
 * known there is no one signed in to say it to. */
export function useAccountSwitchNotice(signedIn: boolean): void {
  const { t } = useTranslation();
  const said = useRef(false);
  useEffect(() => {
    if (!signedIn || said.current) return;
    said.current = true;
    const notice = accountSwitchNotice();
    if (notice) notify({ level: notice.level, message: t(notice.key, notice.values) });
  }, [signedIn, t]);
}