Slideshow

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(function() {

    /* Letzten uninitialisierten Wrapper finden */
    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 && els.length) ? els[0] : null;
    }

    var loadBtn  = q('galleryLoadBtn');
    var prevBtn  = q('galleryPrevBtn');
    var nextBtn  = q('galleryNextBtn');
    var playBtn  = q('galleryPlayBtn');
    var stopBtn  = q('galleryStopBtn');
    var counter  = q('galleryCounter');
    var statusEl = q('galleryStatus');
    var stage    = q('galleryStage');
    var mainImg  = q('galleryMainImg');
    var imgName  = q('galleryImgName');
    var thumbRow = q('galleryThumbRow');

    if (!loadBtn || !stage || !mainImg) { 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 setText(el, txt) { if (el) { el.textContent = txt; } }
    function setStatus(msg, color) { setText(statusEl, msg); if (statusEl) { statusEl.style.color = color || '#888'; } }

    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 forceHttps(url) {
        if (url && url.indexOf('http://') === 0) {
            return 'https://' + url.substring(7);
        }
        return url;
    }

    function loadImages() {
        var pageId = getPageId();
        if (!pageId) { setStatus('Page-ID nicht gefunden!', '#ff4444'); return; }
        loadBtn.disabled = true;
        setStatus('Lade...', '#7ecfff');
        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'); 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  = forceHttps(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);
            }
            if (images.length === 0) { setStatus('Keine Bilder gefunden.', '#ff8c69'); return; }
            setStatus('');
            loadBtn.style.display = 'none';
            stage.style.display = 'block';
            if (thumbRow) { thumbRow.style.display = 'flex'; }
            if (prevBtn) { prevBtn.style.display = 'inline-block'; }
            if (nextBtn) { nextBtn.style.display = 'inline-block'; }
            if (playBtn) { playBtn.style.display = 'inline-block'; }
            buildThumbs();
            showImage(0);
        };
        xhr.onerror = function() { setStatus('API Fehler', '#ff4444'); loadBtn.disabled = false; };
        xhr.send();
    }

    function showImage(idx) {
        currentIdx = idx;
        if (mainImg) {
            mainImg.src = ''; mainImg.src = images[idx].url;
            mainImg.style.cursor = 'pointer';
            mainImg.onclick = function() { window.open(images[idx].url, '_blank'); };
        }
        setText(imgName, images[idx].name);
        setText(counter, (idx + 1) + ' / ' + images.length);
        if (thumbRow) {
            var thumbs = thumbRow.getElementsByTagName('img');
            var j;
            for (j = 0; j < thumbs.length; j++) {
                thumbs[j].className = j === idx ? 'gThumb gThumbActive' : 'gThumb';
            }
        }
    }

    function buildThumbs() {
        if (!thumbRow) { return; }
        thumbRow.innerHTML = '';
        var j;
        for (j = 0; j < images.length; j++) {
            var t = document.createElement('img');
            t.className = 'gThumb';
            t.src = images[j].url;
            t.alt = images[j].name;
            t.title = images[j].name;
            (function(idx) { t.onclick = function() { showImage(idx); }; })(j);
            thumbRow.appendChild(t);
        }
    }

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

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

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

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

    document.onkeydown = function(e) {
        if (!stage || stage.style.display === 'none') return;
        var k = e.keyCode;
        if (k === 37)      { showPrev(); }
        else if (k === 39) { showNext(); }
        else if (k === 32) { if (slideTimer) { stopSlideshow(); } else { startSlideshow(); } }
    };

})();

NoElements {}