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let selectedIndex = -1;
export function initSelection() {
const grid = document.getElementById('media-grid');
if (!grid) return;
grid.addEventListener('click', (e) => {
const card = e.target.closest('.media-card, .media-row');
if (!card) return;
selectByElement(card);
});
}
export function clearSelection() {
selectedIndex = -1;
refreshCards().forEach((c) => c.classList.remove('selected'));
}
function refreshCards() {
return Array.from(document.querySelectorAll('.media-card, .media-row, .folder-card, .set-card'));
}
function syncedIndex(cards) {
const domIndex = cards.findIndex((c) => c.classList.contains('selected'));
if (domIndex >= 0) {
selectedIndex = domIndex;
return domIndex;
}
selectedIndex = -1;
return -1;
}
// Compute grid geometry from the rendered cards.
function gridGeometry(cards) {
if (!cards.length) return { cols: 0, rowMap: [] };
const first = cards[0].getBoundingClientRect();
let colCount = 0;
for (let i = 0; i < cards.length; i++) {
const r = cards[i].getBoundingClientRect();
if (Math.round(r.top) !== Math.round(first.top)) break;
colCount++;
}
// rowMap[i] = row index of cards[i]
const rowMap = cards.map((_, i) => Math.floor(i / colCount));
return { cols: colCount || 1, rowMap };
}
export function select(index) {
const cards = refreshCards();
if (!cards.length) { selectedIndex = -1; return; }
selectedIndex = Math.max(0, Math.min(index, cards.length - 1));
cards.forEach((c) => c.classList.remove('selected'));
const el = cards[selectedIndex];
if (el) {
el.classList.add('selected');
el.scrollIntoView({ block: 'nearest', behavior: 'smooth' });
}
}
export function selectByElement(el) {
const cards = refreshCards();
const idx = cards.indexOf(el);
if (idx >= 0) select(idx);
}
export function next(step = 1) {
const cards = refreshCards();
if (!cards.length) return;
const idx = syncedIndex(cards);
if (idx < 0) {
select(step >= 0 ? 0 : cards.length - 1);
return;
}
select((idx + step + cards.length) % cards.length);
}
export function prev(step = 1) { next(-step); }
// Grid-aware keyboard navigation
export function navLeft() {
const cards = refreshCards();
if (!cards.length) return;
const idx = syncedIndex(cards);
if (idx < 0) {
select(cards.length - 1);
return;
}
const { cols } = gridGeometry(cards);
if (cols === 0) return;
const row = Math.floor(idx / cols);
const col = idx % cols;
if (col > 0) {
select(idx - 1);
} else if (row > 0) {
// wrap to end of previous row
select(row * cols - 1);
}
}
export function navRight() {
const cards = refreshCards();
if (!cards.length) return;
const idx = syncedIndex(cards);
if (idx < 0) {
select(0);
return;
}
const { cols } = gridGeometry(cards);
if (cols === 0) return;
const row = Math.floor(idx / cols);
const col = idx % cols;
const lastInRow = Math.min((row + 1) * cols, cards.length) - 1;
if (col < (lastInRow - row * cols)) {
select(idx + 1);
} else if (idx < cards.length - 1) {
// wrap to start of next row
select(Math.min((row + 1) * cols, cards.length - 1));
}
}
export function navUp() {
const cards = refreshCards();
if (!cards.length) return;
const idx = syncedIndex(cards);
if (idx < 0) {
select(cards.length - 1);
return;
}
const { cols } = gridGeometry(cards);
if (cols === 0) return;
const idxAbove = idx - cols;
if (idxAbove >= 0) {
select(idxAbove);
}
}
export function navDown() {
const cards = refreshCards();
if (!cards.length) return;
const idx = syncedIndex(cards);
if (idx < 0) {
select(0);
return;
}
const { cols } = gridGeometry(cards);
if (cols === 0) return;
const idxBelow = idx + cols;
if (idxBelow < cards.length) {
select(idxBelow);
}
}
export function currentIndex() { return syncedIndex(refreshCards()); }
export function currentElement() {
const cards = refreshCards();
const idx = syncedIndex(cards);
return idx >= 0 ? cards[idx] : null;
}
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