Slideshow

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(function() {

    /* Finde den letzten noch nicht initialisierten Wrapper */
    var allWraps = document.getElementsByClassName('galleryWrap');
    var wrap = null;
    var i;
    for (i = 0; i < allWraps.length; i++) {
        if (!allWraps[i].getAttribute('data-ginit')) {
            wrap = allWraps[i];
        }
    }
    if (!wrap) { return; }
    wrap.setAttribute('data-ginit', '1');

    function q(cls) {
        var els = wrap.getElementsByClassName(cls);
        return els.length ? els[0] : null;
    }

    var loadBtn  = q('galleryLoadBtn');
    var playBtn  = q('galleryPlayBtn');
    var stopBtn  = q('galleryStopBtn');
    var statusEl = q('galleryStatus');
    var debugEl  = q('galleryDebug');
    var grid     = q('galleryGrid');
    var lightbox = q('galleryLightbox');
    var bigImg   = q('galleryBig');
    var caption  = q('galleryCaption');
    var prevBtn  = q('galleryPrev');
    var nextBtn  = q('galleryNext');
    var closeBtn = q('galleryClose');
    var overlay  = q('galleryOverlay');

    /* Sicherheitscheck */
    if (!loadBtn || !grid || !lightbox) { return; }

    var images     = new Array();
    var currentIdx = 0;
    var slideTimer = null;
    var DELAY      = 3000;
    var IMG_EXTS   = 'jpg jpeg png gif bmp webp svg';

    function setStatus(msg, color) {
        if (!statusEl) return;
        statusEl.textContent = msg;
        statusEl.style.color = color || '#888';
    }
    function setDebug(msg) {
        if (!debugEl) return;
        debugEl.textContent = msg;
    }

    function getPageId() {
        var pid = 0;
        if (typeof Deki !== 'undefined') {
            if (Deki.PageId) { pid = Deki.PageId; }
            else if (Deki.Page && Deki.Page.Id) { pid = Deki.Page.Id; }
        }
        return pid;
    }

    function loadImages() {
        var pageId = getPageId();
        setDebug('Page-ID: ' + (pageId ? pageId : 'NICHT GEFUNDEN'));
        if (!pageId) { setStatus('Page-ID nicht gefunden!', '#ff4444'); return; }

        loadBtn.disabled = true;
        setStatus('Lade...', '#7ecfff');
        grid.innerHTML = '';
        images = new Array();

        var xhr = new XMLHttpRequest();
        xhr.open('GET', '/@api/deki/pages/' + pageId + '/files?dream.out.format=xml', true);
        xhr.onload = function() {
            loadBtn.disabled = false;
            if (xhr.status !== 200) {
                setStatus('HTTP ' + xhr.status, '#ff4444');
                setDebug('HTTP ' + xhr.status + ' bei Page-ID ' + pageId);
                return;
            }
            var parser = new DOMParser();
            var xml    = parser.parseFromString(xhr.responseText, 'text/xml');
            var nodes  = xml.getElementsByTagName('file');
            var j;
            for (j = 0; j < nodes.length; j++) {
                var cNodes = nodes[j].getElementsByTagName('contents');
                var nNodes = nodes[j].getElementsByTagName('filename');
                if (!cNodes.length) continue;
                var url  = cNodes[0].getAttribute('href') || '';
                var name = nNodes.length ? nNodes[0].textContent : url;
                var ext  = name.split('.').pop().toLowerCase();
                if (IMG_EXTS.indexOf(ext) === -1) continue;
                var item = new Object();
                item.url = url; item.name = name;
                images.push(item);
            }
            setDebug('Dateien: ' + nodes.length + '  |  Bilder: ' + images.length + '  |  Page: ' + pageId);
            if (images.length === 0) { setStatus('Keine Bilder auf dieser Seite.', '#ff8c69'); return; }
            setStatus(images.length + ' Bild(er)', '#7fffb0');
            renderGrid();
            playBtn.style.display = 'inline-block';
        };
        xhr.onerror = function() {
            setStatus('API Fehler', '#ff4444');
            loadBtn.disabled = false;
        };
        xhr.send();
    }

    function renderGrid() {
        grid.innerHTML = '';
        var j;
        for (j = 0; j < images.length; j++) {
            var img = document.createElement('img');
            img.className = 'galleryThumb';
            img.alt = images[j].name;
            img.src = images[j].url;
            (function(idx) { img.onclick = function() { openLightbox(idx); }; })(j);
            grid.appendChild(img);
        }
    }

    function openLightbox(idx) { currentIdx = idx; updateLightbox(); lightbox.style.display = 'block'; }

    function updateLightbox() {
        bigImg.src = ''; bigImg.src = images[currentIdx].url;
        caption.textContent = (currentIdx + 1) + ' / ' + images.length + ' -- ' + images[currentIdx].name;
        var thumbs = grid.getElementsByTagName('img');
        var j;
        for (j = 0; j < thumbs.length; j++) {
            thumbs[j].className = j === currentIdx ? 'galleryThumb gActive' : 'galleryThumb';
        }
    }

    function closeLightbox() {
        stopSlideshow();
        lightbox.style.display = 'none';
        if (images.length) { playBtn.style.display = 'inline-block'; }
        stopBtn.style.display = 'none';
    }

    function showNext() { currentIdx = (currentIdx + 1) % images.length; updateLightbox(); }
    function showPrev() { currentIdx = (currentIdx - 1 + images.length) % images.length; updateLightbox(); }

    function startSlideshow() {
        if (lightbox.style.display !== 'block') { openLightbox(0); }
        playBtn.style.display = 'none';
        stopBtn.style.display = 'inline-block';
        slideTimer = setInterval(function() { showNext(); }, DELAY);
    }

    function stopSlideshow() {
        if (slideTimer) { clearInterval(slideTimer); slideTimer = null; }
        stopBtn.style.display = 'none';
        if (images.length) { playBtn.style.display = 'inline-block'; }
    }

    loadBtn.onclick  = function() { loadImages(); };
    playBtn.onclick  = function() { startSlideshow(); };
    stopBtn.onclick  = function() { stopSlideshow(); };
    closeBtn.onclick = function() { closeLightbox(); };
    overlay.onclick  = function() { closeLightbox(); };
    prevBtn.onclick  = function() { showPrev(); };
    nextBtn.onclick  = function() { showNext(); };

    document.onkeydown = function(e) {
        if (lightbox.style.display !== 'block') return;
        var k = e.keyCode;
        if (k === 37) { showPrev(); }
        else if (k === 39) { showNext(); }
        else if (k === 27) { closeLightbox(); }
    };

})();

NoElements {}