Falback popolamento cover

app/admin/page.tsx

@@ -6,6 +6,8 @@ import { Card, Portal, MediaItem } from '@/types';
 const isVideoUrl = (url: string) => /\.(mp4|webm|mov|m4v|ogv)(\?|$)/i.test(url);
 const isPdfFile = (file: File) =>
   file.type === 'application/pdf' || /\.pdf$/i.test(file.name);
+const isVideoFile = (file: File) =>
+  file.type.startsWith('video/') || /\.(mp4|webm|mov|m4v|ogv)$/i.test(file.name);
 
 async function uploadBlobAsImage(blob: Blob, name: string): Promise<string | null> {
   const formData = new FormData();
@@ -15,6 +17,42 @@ async function uploadBlobAsImage(blob: Blob, name: string): Promise<string | nul
   return data.url || null;
 }
 
+async function extractVideoFrame(file: File): Promise<Blob | null> {
+  const url = URL.createObjectURL(file);
+  try {
+    const video = document.createElement('video');
+    video.muted = true;
+    video.playsInline = true;
+    video.preload = 'metadata';
+    video.src = url;
+
+    await new Promise<void>((resolve, reject) => {
+      video.addEventListener('loadedmetadata', () => resolve(), { once: true });
+      video.addEventListener('error', () => reject(new Error('video load error')), { once: true });
+    });
+
+    // Seek slightly past 0 — at exactly 0 some codecs return a black frame
+    video.currentTime = Math.min(0.1, Math.max(0, video.duration / 10));
+    await new Promise<void>((resolve, reject) => {
+      video.addEventListener('seeked', () => resolve(), { once: true });
+      video.addEventListener('error', () => reject(new Error('video seek error')), { once: true });
+    });
+
+    const canvas = document.createElement('canvas');
+    canvas.width = video.videoWidth;
+    canvas.height = video.videoHeight;
+    const ctx = canvas.getContext('2d');
+    if (!ctx) return null;
+    ctx.drawImage(video, 0, 0);
+
+    return await new Promise<Blob | null>((resolve) =>
+      canvas.toBlob((b) => resolve(b), 'image/jpeg', 0.85)
+    );
+  } finally {
+    URL.revokeObjectURL(url);
+  }
+}
+
 async function pdfToImageItems(
   file: File,
   onProgress: (page: number, total: number) => void
@@ -102,6 +140,10 @@ export default function AdminDashboard() {
     if (!files || files.length === 0) return;
     setUploading(prev => ({ ...prev, extraMedia: true }));
 
+    const startedWithoutCover = !isEditing?.imageUrl;
+    let pendingCover: string | null = null;
+    const canPromote = () => startedWithoutCover && !pendingCover;
+
     const uploaded: MediaItem[] = [];
     for (const file of Array.from(files)) {
       try {
@@ -109,14 +151,46 @@ export default function AdminDashboard() {
           const items = await pdfToImageItems(file, (page, total) =>
             setPdfProgress({ name: file.name, page, total })
           );
-          uploaded.push(...items);
           setPdfProgress(null);
+          if (items.length > 0 && canPromote()) {
+            // Promote the first PDF page to cover; skip it from the gallery to avoid duplication.
+            pendingCover = items[0].url;
+            uploaded.push(...items.slice(1));
+          } else {
+            uploaded.push(...items);
+          }
         } else {
           const formData = new FormData();
           formData.append('file', file);
           const res = await fetch('/api/upload', { method: 'POST', body: formData });
           const data = await res.json();
-          if (data.url) uploaded.push({ url: data.url });
+          if (!data.url) continue;
+
+          if (isVideoFile(file)) {
+            // Video always goes to the gallery so users can play it.
+            uploaded.push({ url: data.url });
+            // If no cover yet, extract the first frame and use it as the cover.
+            if (canPromote()) {
+              try {
+                const blob = await extractVideoFrame(file);
+                if (blob) {
+                  const baseName = file.name.replace(/\.[^.]+$/, '').replace(/[^a-zA-Z0-9-_]/g, '_');
+                  const posterUrl = await uploadBlobAsImage(blob, `${baseName}-poster.jpg`);
+                  if (posterUrl) pendingCover = posterUrl;
+                }
+              } catch (err) {
+                console.warn('Could not extract video poster for', file.name, err);
+              }
+            }
+          } else {
+            // Plain image
+            if (canPromote()) {
+              // Promote to cover; skip the gallery to avoid duplication.
+              pendingCover = data.url;
+            } else {
+              uploaded.push({ url: data.url });
+            }
+          }
         }
       } catch (err) {
         console.error('Upload failed for', file.name, err);
@@ -127,6 +201,7 @@ export default function AdminDashboard() {
 
     setIsEditing(prev => ({
       ...prev,
+      imageUrl: (startedWithoutCover && pendingCover) ? pendingCover : (prev?.imageUrl || ''),
       extraMedia: [...(prev?.extraMedia || []), ...uploaded],
     }));
     setUploading(prev => ({ ...prev, extraMedia: false }));