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let currentMediaList = [];
let currentIndex = -1;
let zoomScale = 1;
let panX = 0;
let panY = 0;
let isPanning = false;
let panStart = { x: 0, y: 0 };
let slideshowTimer = null;
let slideshowPausedUntil = 0;
let onNavigateCallback = null;
export function initLightbox({ onNavigate }) {
onNavigateCallback = onNavigate;
document.getElementById('lb-close')?.addEventListener('click', close);
document.getElementById('lb-prev')?.addEventListener('click', prev);
document.getElementById('lb-next')?.addEventListener('click', next);
document.getElementById('lb-zoom-in')?.addEventListener('click', zoomIn);
document.getElementById('lb-zoom-out')?.addEventListener('click', zoomOut);
document.getElementById('lb-slideshow')?.addEventListener('click', toggleSlideshow);
// Close on backdrop click (clicking outside the image/toolbar)
document.getElementById('image-lightbox')?.addEventListener('click', (e) => {
if (e.target === e.currentTarget) close();
});
const img = document.getElementById('lightbox-image');
if (img) {
img.addEventListener('mousedown', (e) => {
if (zoomScale > 1) {
isPanning = true;
panStart = { x: e.clientX - panX, y: e.clientY - panY };
img.style.cursor = 'grabbing';
e.preventDefault();
}
});
img.addEventListener('wheel', (e) => {
e.preventDefault();
if (e.deltaY < 0) zoomIn();
else zoomOut();
}, { passive: false });
}
window.addEventListener('mousemove', (e) => {
if (!isPanning) return;
panX = e.clientX - panStart.x;
panY = e.clientY - panStart.y;
applyTransform();
});
window.addEventListener('mouseup', () => {
if (isPanning) {
isPanning = false;
const img = document.getElementById('lightbox-image');
if (img) img.style.cursor = zoomScale > 1 ? 'grab' : 'zoom-in';
}
});
}
export function open(mediaArray, startMediaId) {
currentMediaList = mediaArray.filter((m) => m.type === 'image');
currentIndex = currentMediaList.findIndex((m) => m.id === startMediaId);
if (currentIndex === -1) currentIndex = 0;
render();
document.getElementById('image-lightbox')?.classList.add('open');
}
export function close() {
stopSlideshow();
document.getElementById('image-lightbox')?.classList.remove('open');
resetZoom();
currentMediaList = [];
currentIndex = -1;
}
export function isOpen() {
return document.getElementById('image-lightbox')?.classList.contains('open');
}
export function next() {
if (!currentMediaList.length) return;
currentIndex = (currentIndex + 1) % currentMediaList.length;
render();
pauseSlideshow();
}
export function prev() {
if (!currentMediaList.length) return;
currentIndex = (currentIndex - 1 + currentMediaList.length) % currentMediaList.length;
render();
pauseSlideshow();
}
export function zoomIn() {
setZoom(zoomScale * 1.25);
pauseSlideshow();
}
export function zoomOut() {
setZoom(zoomScale / 1.25);
pauseSlideshow();
}
export function toggleSlideshow() {
if (slideshowTimer) stopSlideshow();
else startSlideshow();
}
export function isSlideshowActive() {
return !!slideshowTimer;
}
function render() {
const media = currentMediaList[currentIndex];
const img = document.getElementById('lightbox-image');
const meta = document.getElementById('lb-meta');
const counter = document.getElementById('lb-counter');
if (!media || !img) return;
img.src = `/api/media/${media.id}/stream`;
resetZoom();
if (meta) {
const size = media.file_size_bytes ? fmtSize(media.file_size_bytes) : '';
const res = media.resolution || '';
meta.textContent = `${media.file_name}${res ? ' — ' + res : ''}${size ? ' — ' + size : ''}`;
}
if (counter) {
counter.textContent = `${currentIndex + 1} / ${currentMediaList.length}`;
}
}
function setZoom(s) {
zoomScale = Math.max(0.5, Math.min(s, 5));
applyTransform();
}
function applyTransform() {
const img = document.getElementById('lightbox-image');
if (!img) return;
img.style.transform = `translate(${panX}px, ${panY}px) scale(${zoomScale})`;
img.style.cursor = zoomScale > 1 ? 'grab' : 'zoom-in';
}
function resetZoom() {
zoomScale = 1;
panX = 0;
panY = 0;
applyTransform();
}
function startSlideshow() {
if (slideshowTimer) clearInterval(slideshowTimer);
slideshowTimer = setInterval(() => {
if (Date.now() < slideshowPausedUntil) return;
if (!isOpen()) { stopSlideshow(); return; }
next();
}, 5000);
const btn = document.getElementById('lb-slideshow');
if (btn) btn.textContent = '⏸';
}
function stopSlideshow() {
clearInterval(slideshowTimer);
slideshowTimer = null;
const btn = document.getElementById('lb-slideshow');
if (btn) btn.textContent = '⏵';
}
function pauseSlideshow() {
slideshowPausedUntil = Date.now() + 10000;
}
function fmtSize(bytes) {
if (!bytes || bytes <= 0) return '';
const kb = bytes / 1024;
if (kb < 1024) return Math.round(kb) + ' KB';
const mb = kb / 1024;
if (mb < 1024) return Math.round(mb * 10) / 10 + ' MB';
return Math.round((mb / 1024) * 10) / 10 + ' GB';
}
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