feat: Seiten- und Wortzahl für den Duplikatvergleich

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

paperless-backend/src/inbox/inbox.controller.ts

@@ -21,6 +21,11 @@ import { BarcodeScannerService } from '../barcode/barcode-scanner.service';
 import { UserSettingsService } from '../user-settings/user-settings.service';
 import { RequirePermissions } from '../auth/permissions.decorator';
 import { Permission } from '../auth/permissions.enum';
+import { PaperlessService } from '../paperless/paperless.service';
+import {
+  kennzahlenAusPdf,
+  type VergleichKennzahlen,
+} from '../paperless/vergleich-kennzahlen.util';
 
 @Controller('api/inbox')
 @RequirePermissions(Permission.VIEW_SCANNER)
@@ -30,6 +35,7 @@ export class InboxController {
     private readonly postprocessor: InboxPostprocessorService,
     private readonly barcodeScanner: BarcodeScannerService,
     private readonly userSettingsService: UserSettingsService,
+    private readonly paperlessService: PaperlessService,
   ) {}
 
   @Get()
@@ -250,6 +256,29 @@ export class InboxController {
     return new StreamableFile(Readable.from(buffer));
   }
 
+  /** Seiten-/Wortzahl des Abschnitts und des vorhandenen Paperless-Dokuments. */
+  @Post(':id/vergleich')
+  async vergleich(
+    @Param('id') id: string,
+    @Body() body: { paperlessDocumentId: number; pages: number[] },
+    @Request() req: any,
+  ): Promise<VergleichKennzahlen> {
+    const preferredUsername: string | null =
+      req.user?.preferredUsername ?? null;
+    const { buffer } = await this.inboxService.getSegmentPdfBuffer(
+      id,
+      preferredUsername,
+      body.pages ?? [],
+    );
+    const [vorhanden, neu] = await Promise.all([
+      this.paperlessService.getDocumentKennzahlen(
+        Number(body.paperlessDocumentId),
+      ),
+      kennzahlenAusPdf(buffer),
+    ]);
+    return { vorhanden, neu };
+  }
+
   @Post(':id/send-email')
   @HttpCode(204)
   async sendEmail(