/**
 * 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 */ }
        });
    }

    /* Accordéon EXCLUSIF (0.22.0) : une seule section ouverte
       à la fois. Ouvrir une section ferme les autres ; cliquer
       la section ouverte la referme. L'état initial vient du
       script d'amorce de _header.html (section de la page
       courante ou choix mémorisé dans kanbante-nav-open). */
    var groupBtns = document.querySelectorAll('[data-group-btn]');
    function syncGroupBtn(btn) {
        var closed = document.body.classList.contains(
            'nav-closed-' + btn.getAttribute('data-group-btn'));
        btn.setAttribute('aria-expanded', closed ? 'false' : 'true');
    }
    function setOpenGroup(openKey) {
        groupBtns.forEach(function (btn) {
            var key = btn.getAttribute('data-group-btn');
            document.body.classList.toggle('nav-closed-' + key, key !== openKey);
            syncGroupBtn(btn);
        });
        try {
            localStorage.setItem('kanbante-nav-open', openKey);
        } catch (e) { /* non-fatal */ }
    }
    groupBtns.forEach(function (btn) {
        syncGroupBtn(btn);
        btn.addEventListener('click', function () {
            var key = btn.getAttribute('data-group-btn');
            var isOpen = !document.body.classList.contains('nav-closed-' + key);
            setOpenGroup(isOpen ? '' : key);
        });
    });
})();