feat: auto-download YouTube thumbnails on content create/update

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/collections/YouTubeContent.ts

@@ -8,6 +8,7 @@ import {
   canAccessAssignedContent,
 } from '../lib/youtubeAccess'
 import { createTasksOnStatusChange } from '../hooks/youtubeContent/createTasksOnStatusChange'
+import { downloadThumbnail } from '../hooks/youtubeContent/downloadThumbnail'
 // TODO: ScriptSectionBlock causes admin UI rendering issues
 // import { ScriptSectionBlock } from '../blocks/ScriptSectionBlock'
 
@@ -38,7 +39,7 @@ export const YouTubeContent: CollectionConfig = {
     delete: isYouTubeManager,
   },
   hooks: {
-    afterChange: [createTasksOnStatusChange],
+    afterChange: [createTasksOnStatusChange, downloadThumbnail],
     beforeChange: [
       // Auto-Slug generieren
       ({ data }) => {

src/hooks/youtubeContent/downloadThumbnail.ts

@@ -0,0 +1,43 @@
+import type { CollectionAfterChangeHook } from 'payload'
+import { downloadAndUploadImage } from '../../lib/utils/media-download'
+import { getYouTubeThumbnail } from '../../lib/utils/youtube'
+
+/**
+ * After a YouTubeContent document is created or updated,
+ * automatically download the YouTube thumbnail if the thumbnail field is empty
+ * and a YouTube videoId is present.
+ */
+export const downloadThumbnail: CollectionAfterChangeHook = async ({ doc, req }) => {
+  // Skip if thumbnail already exists (manual upload or previous download)
+  if (doc.thumbnail) return doc
+
+  // Get the YouTube video ID
+  const videoId = doc.youtube?.videoId
+  if (!videoId) return doc
+
+  const thumbnailUrl = getYouTubeThumbnail(videoId, 'hq')
+  const filename = `yt-thumb-${videoId}.jpg`
+
+  const tenantId = typeof doc.tenant === 'object' ? doc.tenant?.id : doc.tenant
+
+  const mediaId = await downloadAndUploadImage(req.payload, {
+    url: thumbnailUrl,
+    filename,
+    alt: doc.title
+      ? `Thumbnail: ${typeof doc.title === 'string' ? doc.title : doc.title?.de || doc.title?.en || videoId}`
+      : `YouTube Thumbnail ${videoId}`,
+    tenantId: tenantId || undefined,
+  })
+
+  if (mediaId) {
+    await req.payload.update({
+      collection: 'youtube-content',
+      id: doc.id,
+      data: { thumbnail: mediaId },
+      depth: 0,
+    })
+    console.log(`[yt-thumbnail] Auto-downloaded thumbnail for video ${videoId} (media: ${mediaId})`)
+  }
+
+  return doc
+}