const REFRESH_INTERVAL = 30;
let _countdownTimer = null;

function _startRefreshCountdown() {
    if (_countdownTimer) clearInterval(_countdownTimer);
    let secs = REFRESH_INTERVAL;
    const el = document.getElementById('lastRefresh');
    const update = () => {
        const t = new Date().toLocaleTimeString();
        el.textContent = `Updated ${t} — next in ${secs}s`;
        if (secs <= 0) secs = REFRESH_INTERVAL; else secs--;
    };
    update();
    _countdownTimer = setInterval(update, 1000);
}

loadDashboard();
loadShares();
loadUsers();
loadGroups();
setInterval(() => { loadDashboard(); loadShares(); loadUsers(); loadGroups(); }, REFRESH_INTERVAL * 1000);