toc-menu

/* ==========================================================
 * TOC MENU
 * FIX 24.02.2026: Singleton Guard + td.left Blocker Fix
 * ========================================================== */

:root {
    --menu-width: 500px;
    --menu-width-mobile: 320px;
    --menu-max-height: 70vh;
    --menu-max-height-mobile: 60vh;
    --menu-font-size: 18px;
    --menu-font-title-size: 22px;
    --menu-background: white;
    --menu-border-color: #ddd;
    --icon-size: 50px;
    --icon-size-mobile: 45px;
    --icon-background: #333;
    --icon-background-hover: #555;
}

/* FIX 24.02.2026: MindTouch Layout-Tabelle blockiert fixed-position Elemente */
td.left {
    pointer-events: none;
}
td.left > * {
    pointer-events: auto;
}

.menu-toggle-icon {
    position: fixed !important;
    bottom: 30px !important;
    left: 30px !important;
    width: var(--icon-size) !important;
    height: var(--icon-size) !important;
    background: var(--icon-background) !important;
    border-radius: 50% !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    cursor: pointer !important;
    z-index: 9998 !important;
    opacity: 0 !important;
    visibility: hidden !important;
    pointer-events: none !important;
    transition: opacity 0.4s ease, visibility 0.4s ease !important;
}

.menu-toggle-icon.visible {
    opacity: 0.8 !important;
    visibility: visible !important;
    pointer-events: auto !important;
}

.menu-toggle-icon:hover {
    opacity: 1 !important;
    background: var(--icon-background-hover) !important;
}
.menu-toggle-icon::before {
    content: '\2630' !important;
    color: white !important;
    font-size: 28px !important;
    font-weight: bold !important;
    line-height: 1 !important;
    margin-left: 5px !important;
}

#menuPageContent {
    position: fixed !important;
    bottom: 90px !important;
    left: 20px !important;
    background: var(--menu-background) !important;
    border: 1px solid var(--menu-border-color) !important;
    width: var(--menu-width) !important;
    max-height: var(--menu-max-height) !important;
    overflow-y: auto !important;
    overflow-x: hidden !important;
    z-index: 2147483647 !important;
    box-sizing: border-box !important;
}

#menuPageContent *,
#menuPageContent .dmenu-top_m,
#menuPageContent .dmenu-body_m {
    box-sizing: border-box !important;
    width: 100% !important;
    max-width: 100% !important;
    background: var(--menu-background) !important;
}
#menuPageContent .dmenu-top_m,
#menuPageContent .dmenu-body_m {
    font-size: var(--menu-font-size) !important;
    line-height: 1.8 !important;
}
#menuPageContent .dmenu-body_m ol li a {
    font-size: var(--menu-font-title-size) !important;
}

#menuPageContent::-webkit-scrollbar {
    width: 8px !important;
}
#menuPageContent::-webkit-scrollbar-track {
    background: var(--menu-background) !important;
}
#menuPageContent::-webkit-scrollbar-thumb {
    background: #888 !important;
}
#menuPageContent::-webkit-scrollbar-thumb:hover {
    background: #555 !important;
}

@media (max-width: 768px) {
    .menu-toggle-icon {
        width: var(--icon-size-mobile) !important;
        height: var(--icon-size-mobile) !important;
        bottom: 20px !important;
        left: 20px !important;
    }
    #menuPageContent {
        width: var(--menu-width-mobile) !important;
        bottom: 75px !important;
        max-height: var(--menu-max-height-mobile) !important;
    }
}

(function() {
    /* ==========================================================
     * TOC MENU - mit Singleton Guard + Scroll Visibility
     * FIX 24.02.2026: Singleton, td.left Fix, Scroll ab 1000px
     * ========================================================== */

    if (window._tocMenuInit) {
        if (window.console) console.log('[TOC-Menu] SKIP: Bereits initialisiert (Singleton)');
        return;
    }
    window._tocMenuInit = true;

    var PREFIX = '[TOC-Menu] ';
    var THRESHOLD = 1000;
    var isMenuOpen = false;
    var isIconVisible = false;
    var scrollTimer = null;

    function log(msg) {
        if (window.console && console.log) {
            console.log(PREFIX + msg);
        }
    }

    log('Init gestartet...');

    var menuIcon = document.getElementById('menuToggleIcon');

    if (!menuIcon) {
        log('ERROR: menuToggleIcon nicht gefunden!');
        return;
    }

    /* Scroll-Visibility: Icon erst ab 1000px */
    function updateVisibility() {
        var scrollTop = window.pageYOffset ||
                        document.documentElement.scrollTop ||
                        document.body.scrollTop || 0;

        if (scrollTop > THRESHOLD && !isIconVisible) {
            menuIcon.className = 'menu-toggle-icon visible';
            isIconVisible = true;
            log('Icon sichtbar (Scroll > ' + THRESHOLD + 'px)');
        } else if (scrollTop <= THRESHOLD && isIconVisible) {
            menuIcon.className = 'menu-toggle-icon';
            isIconVisible = false;

            /* Menu auch schliessen wenn Icon verschwindet */
            var dmenu = document.getElementById('menuPageContent');
            if (isMenuOpen && dmenu) {
                dmenu.style.display = 'none';
                isMenuOpen = false;
            }
        }
    }

    /* Hamburger Icon Klick */
    menuIcon.addEventListener('click', function(e) {
        e.stopPropagation();
        var dmenu = document.getElementById('menuPageContent');

        if (dmenu) {
            if (isMenuOpen) {
                dmenu.style.display = 'none';
                isMenuOpen = false;
                log('Menu geschlossen');
            } else {
                window.menuBubble = true;
                dmenu.style.display = 'block';
                isMenuOpen = true;
                log('Menu geoeffnet');
            }
        }
    });

    /* Klick ausserhalb schliesst Menu */
    document.addEventListener('click', function(e) {
        var dmenu = document.getElementById('menuPageContent');
        if (isMenuOpen && dmenu) {
            var clickedInsideMenu = dmenu.contains(e.target);
            var clickedIcon = menuIcon.contains(e.target);

            if (!clickedInsideMenu && !clickedIcon) {
                dmenu.style.display = 'none';
                isMenuOpen = false;
                log('Menu geschlossen (Klick aussen)');
            } else if (clickedInsideMenu && e.target.tagName === 'A') {
                dmenu.style.display = 'none';
                isMenuOpen = false;
                log('Menu geschlossen (Link geklickt)');
            }
        }
    });

    /* Scroll Listener mit Throttle */
    if (window.addEventListener) {
        window.addEventListener('scroll', function() {
            clearTimeout(scrollTimer);
            scrollTimer = setTimeout(updateVisibility, 80);
        }, false);
    } else if (window.attachEvent) {
        window.attachEvent('onscroll', function() {
            clearTimeout(scrollTimer);
            scrollTimer = setTimeout(updateVisibility, 80);
        });
    }

    /* Initial Check */
    updateVisibility();

    log('Fertig! Threshold: ' + THRESHOLD + 'px');
})();