/**
 * Kanbante — sidebar behaviour (issue #16, 0.16.0 layout).
 * Desktop: collapse to an icon rail (persisted in localStorage).
 * Mobile: the same sidebar becomes an off-canvas drawer, toggled
 * by the topbar burger, closed by backdrop / Escape / navigation.
 */
(function () {
    var burger = document.getElementById('nav-burger');
    var backdrop = document.getElementById('side-backdrop');
    var collapseBtn = document.getElementById('side-collapse');

    function closeDrawer() {
        document.body.classList.remove('sidebar-open');
        if (backdrop) backdrop.hidden = true;
        if (burger) {
            burger.setAttribute('aria-expanded', 'false');
            burger.textContent = '☰';
        }
    }

    if (burger) {
        burger.addEventListener('click', function () {
            var open = document.body.classList.toggle('sidebar-open');
            burger.setAttribute('aria-expanded', open ? 'true' : 'false');
            burger.textContent = open ? '✕' : '☰';
            if (backdrop) backdrop.hidden = !open;
        });
    }
    if (backdrop) backdrop.addEventListener('click', closeDrawer);
    document.addEventListener('keydown', function (e) {
        if (e.key === 'Escape') closeDrawer();
    });
    window.addEventListener('resize', function () {
        if (window.innerWidth > 900) closeDrawer();
    });

    if (collapseBtn) {
        collapseBtn.addEventListener('click', function () {
            var collapsed = document.body.classList.toggle('sidebar-collapsed');
            try {
                localStorage.setItem('kanbante-sidebar', collapsed ? 'collapsed' : 'open');
            } catch (e) { /* private mode: state lasts for the page only */ }
        });
    }
})();