// Cart count badge in the site header. Lived inside `initTabs()` until the
// dashboard strips became described regions and `core/tabs.ts` went away; it
// was never tab behaviour, it just ran on every page from the one place that
// already did.

/** Fill the header cart link with its item count, and reveal it when non-zero.
 *  Inert on pages without `#nav-cart-link` (`partials/site_header.html`). */
export function initCartBadge(): void {
  const cartLink = document.getElementById('nav-cart-link');
  if (!cartLink) return;

  fetch('/api/cart/count', { credentials: 'same-origin' })
    .then((r) => (r.ok ? r.json() : null))
    .then((data: { count?: number } | null) => {
      if (data && typeof data.count === 'number' && data.count > 0) {
        cartLink.classList.remove('hidden');
        const badge = document.getElementById('cart-badge');
        if (badge) badge.textContent = ' (' + data.count + ')';
      }
    })
    .catch(() => {});
}