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+import type { MediaInput } from '@photo-gallery/sdk';
+
+/**
+ * Demo seed data. Uses free Picsum photos with synthetic-but-realistic metadata
+ * (capture dates, GPS locations, tags, detected objects, sources) so that the
+ * Map, Search, Smart Albums and "find similar object" features all have data to
+ * show without any backend or API key.
+ *
+ * Picsum is allow-listed in the CSP (see next.config.mjs). Videos use Google's
+ * public sample bucket, also allow-listed.
+ */
+
+const CITIES: Array<{ place: string; city: string; country: string; lat: number; lng: number }> = [
+  { place: 'Mumbai, India', city: 'Mumbai', country: 'India', lat: 19.076, lng: 72.8777 },
+  { place: 'New Delhi, India', city: 'New Delhi', country: 'India', lat: 28.6139, lng: 77.209 },
+  { place: 'Bengaluru, India', city: 'Bengaluru', country: 'India', lat: 12.9716, lng: 77.5946 },
+  { place: 'Goa, India', city: 'Goa', country: 'India', lat: 15.2993, lng: 74.124 },
+  { place: 'Manali, India', city: 'Manali', country: 'India', lat: 32.2432, lng: 77.1892 },
+  { place: 'Jaipur, India', city: 'Jaipur', country: 'India', lat: 26.9124, lng: 75.7873 },
+  { place: 'San Francisco, USA', city: 'San Francisco', country: 'USA', lat: 37.7749, lng: -122.4194 },
+  { place: 'New York, USA', city: 'New York', country: 'USA', lat: 40.7128, lng: -74.006 },
+  { place: 'London, UK', city: 'London', country: 'UK', lat: 51.5074, lng: -0.1278 },
+  { place: 'Paris, France', city: 'Paris', country: 'France', lat: 48.8566, lng: 2.3522 },
+  { place: 'Tokyo, Japan', city: 'Tokyo', country: 'Japan', lat: 35.6762, lng: 139.6503 },
+  { place: 'Dubai, UAE', city: 'Dubai', country: 'UAE', lat: 25.2048, lng: 55.2708 },
+];
+
+const TAG_POOL = [
+  ['beach', 'sunset', 'ocean'],
+  ['mountain', 'snow', 'hike'],
+  ['food', 'restaurant'],
+  ['city', 'building', 'night'],
+  ['nature', 'flower', 'plant'],
+  ['friends', 'party'],
+  ['travel', 'landmark'],
+  ['selfie', 'portrait'],
+];
+
+const OBJECT_POOL = [
+  ['person'],
+  ['dog'],
+  ['cat'],
+  ['car'],
+  ['laptop', 'cup'],
+  ['dining table', 'chair', 'bottle'],
+  ['tv', 'chair'],
+  ['potted plant'],
+  ['bicycle', 'person'],
+];
+
+// Served from the demo's own /public so it plays same-origin (no CORS / ORB issues).
+const SAMPLE_VIDEOS = ['/sample-clip.mp4'];
+
+const DAY = 24 * 60 * 60 * 1000;
+
+export function buildSeedPhotos(now = Date.now()): MediaInput[] {
+  const items: MediaInput[] = [];
+
+  for (let i = 0; i < 44; i++) {
+    const seed = `apg-${i}`;
+    const takenAt = now - Math.floor(i * 8.4 + (i % 5) * 3) * DAY;
+    // ~75% of demo photos are geotagged (real photos populate location via EXIF GPS on import).
+    const hasLoc = i % 4 !== 0;
+    const city = CITIES[i % CITIES.length]!;
+    const tags = TAG_POOL[i % TAG_POOL.length]!;
+    const objects = i % 3 === 0 ? OBJECT_POOL[i % OBJECT_POOL.length]! : [];
+
+    // Distribute sources to populate smart albums.
+    let source: MediaInput['source'] = 'camera';
+    let name = `IMG_${4000 + i}.jpg`;
+    let width = 1600;
+    let height = 1067;
+
+    const variant = i % 7;
+    if (variant === 1) {
+      source = 'screenshot';
+      name = `Screenshot 2026-0${(i % 9) + 1}-12 at 9.41.${10 + i}.png`;
+      width = 1170;
+      height = 2532;
+    } else if (variant === 2) {
+      source = 'download';
+      name = `download-${i}.jpg`;
+    } else if (variant === 3) {
+      source = 'social';
+      name = `IMG-2026031${i % 9}-WA00${i % 9}.jpg`;
+    } else if (variant === 5) {
+      // panorama
+      width = 2400;
+      height = 820;
+      name = `PANO_${i}.jpg`;
+    }
+
+    const isVideo = i % 11 === 4; // a few videos
+    if (isVideo) {
+      const v = SAMPLE_VIDEOS[i % SAMPLE_VIDEOS.length]!;
+      items.push({
+        src: v,
+        poster: `https://picsum.photos/seed/${seed}/1280/720`,
+        thumbnail: `https://picsum.photos/seed/${seed}/600/400`,
+        name: `MOV_${5000 + i}.mp4`,
+        kind: 'video',
+        mime: 'video/mp4',
+        width: 1280,
+        height: 720,
+        duration: 30 + (i % 4) * 12,
+        takenAt,
+        source: 'camera',
+        bytes: 18_000_000 + i * 250_000,
+        tags,
+        objectLabels: objects,
+        favorite: i % 9 === 0,
+        location: hasLoc ? { ...city } : undefined,
+      });
+      continue;
+    }
+
+    items.push({
+      src: `https://picsum.photos/seed/${seed}/${width}/${height}`,
+      thumbnail: `https://picsum.photos/seed/${seed}/${Math.round(width / 3)}/${Math.round(height / 3)}`,
+      name,
+      kind: 'image',
+      mime: source === 'screenshot' ? 'image/png' : 'image/jpeg',
+      width,
+      height,
+      takenAt,
+      source,
+      bytes: 2_400_000 + i * 90_000,
+      tags,
+      objectLabels: objects,
+      favorite: i % 6 === 0,
+      isPanorama: variant === 5,
+      location: hasLoc ? { ...city } : undefined,
+      exif:
+        source === 'camera'
+          ? { Make: 'Apple', Model: 'iPhone 16 Pro', FNumber: 1.8, ISO: 100 + (i % 8) * 50 }
+          : undefined,
+    });
+  }
+
+  return items;
+}