presenter refactoring

apps/api/src/domain/media/presenters/GetMediaPresenter.ts

@@ -1,4 +1,8 @@
 import type { IGetMediaPresenter, GetMediaResult } from '@core/media/application/presenters/IGetMediaPresenter';
+import type { GetMediaOutputDTO } from '../dtos/GetMediaOutputDTO';
+
+// The HTTP-facing DTO (or null when not found)
+export type GetMediaViewModel = GetMediaOutputDTO | null;
 
 export class GetMediaPresenter implements IGetMediaPresenter {
   private result: GetMediaResult | null = null;
@@ -7,8 +11,21 @@ export class GetMediaPresenter implements IGetMediaPresenter {
     this.result = result;
   }
 
-  get viewModel(): GetMediaResult {
-    if (!this.result) throw new Error('Presenter not presented');
-    return this.result;
+  get viewModel(): GetMediaViewModel {
+    if (!this.result || !this.result.success || !this.result.media) {
+      return null;
+    }
+
+    const media = this.result.media;
+
+    return {
+      id: media.id,
+      url: media.url,
+      type: media.type,
+      // Best-effort mapping from arbitrary metadata
+      category: (media.metadata as { category?: string } | undefined)?.category,
+      uploadedAt: media.uploadedAt,
+      size: media.size,
+    };
   }
 }