import { useEffect, useRef } from 'react';

/**
 * Calls `reread` each time `joinRecovery` (from the session) moves: a member whose session opened before every
 * gateway admitted them pressed Check again and was confirmed, so a read refused while their access settled is
 * made again without a reload. Never on mount, and never for an ordinary session, whose count does not move:
 * a role that is refused for good stays refused.
 */
export const useRereadOnJoinRecovery = (joinRecovery: number | undefined, reread: () => void) => {
    const seen = useRef(joinRecovery);
    useEffect(() => {
        if (seen.current === joinRecovery) return;
        seen.current = joinRecovery;
        reread();
    }, [joinRecovery, reread]);
};