Initialize repo and add session changes (2025-09-08)

resources/js/guest/polling/usePollGalleryDelta.ts

@@ -0,0 +1,42 @@
+import { useEffect, useRef, useState } from 'react';
+
+type Photo = { id: number; file_path?: string; thumbnail_path?: string; created_at?: string };
+
+export function usePollGalleryDelta(slug: string) {
+  const [photos, setPhotos] = useState<Photo[]>([]);
+  const [loading, setLoading] = useState(true);
+  const [newCount, setNewCount] = useState(0);
+  const latestAt = useRef<string | null>(null);
+  const timer = useRef<number | null>(null);
+
+  async function fetchDelta() {
+    const qs = latestAt.current ? `?since=${encodeURIComponent(latestAt.current)}` : '';
+    const res = await fetch(`/api/v1/events/${encodeURIComponent(slug)}/photos${qs}`, {
+      headers: { 'Cache-Control': 'no-store' },
+    });
+    if (res.status === 304) return;
+    const json = await res.json();
+    if (Array.isArray(json.data)) {
+      const added = json.data.length;
+      const merged = latestAt.current ? [...json.data, ...photos] : json.data;
+      if (added > 0 && latestAt.current) setNewCount((c) => c + added);
+      setPhotos(merged);
+    }
+    if (json.latest_photo_at) latestAt.current = json.latest_photo_at;
+    setLoading(false);
+  }
+
+  useEffect(() => {
+    setLoading(true);
+    latestAt.current = null;
+    setPhotos([]);
+    fetchDelta();
+    timer.current = window.setInterval(fetchDelta, 30_000);
+    return () => {
+      if (timer.current) window.clearInterval(timer.current);
+    };
+  }, [slug]);
+
+  function acknowledgeNew() { setNewCount(0); }
+  return { loading, photos, newCount, acknowledgeNew };
+}