Add file processing notifications feature

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

app/tasks/finalize_document_storage.py

@@ -1,12 +1,16 @@
 #!/usr/bin/env python3
 
+import os
 from app.config import settings
 from app.tasks.retry_config import BaseTaskWithRetry
 # Import the shared Celery instance
 from app.celery_app import celery
 
 # 1) Import the aggregator task
-from app.tasks.send_to_all import send_to_all_destinations
+from app.tasks.send_to_all import send_to_all_destinations, get_configured_services_from_validator
+
+# Import notification utility
+from app.utils.notification import notify_file_processed
 
 
 @celery.task(base=BaseTaskWithRetry)
@@ -14,12 +18,42 @@ def finalize_document_storage(original_file: str, processed_file: str, metadata:
     """
     Final storage step after embedding metadata.
     We will now call 'send_to_all_destinations' to push the final PDF to Dropbox/Nextcloud/Paperless.
+    After uploading, send a notification about the processed file.
     """
     print(f"[INFO] Finalizing document storage for {processed_file}")
 
+    # Determine which destinations are configured
+    configured_destinations = []
+    try:
+        configured_services = get_configured_services_from_validator()
+        # Get list of service names that are configured
+        for service_name, is_configured in configured_services.items():
+            if is_configured:
+                # Format service names for display
+                display_name = service_name.replace('_', ' ').title()
+                configured_destinations.append(display_name)
+    except Exception as e:
+        print(f"[WARNING] Could not determine configured destinations: {e}")
+        configured_destinations = ["configured destinations"]
+
     # 2) Enqueue uploads to all destinations (Dropbox, Nextcloud, Paperless)
     send_to_all_destinations.delay(processed_file)
 
+    # 3) Send notification about successful file processing
+    try:
+        # Get file information
+        file_size = os.path.getsize(processed_file) if os.path.exists(processed_file) else 0
+        filename = os.path.basename(processed_file)
+        
+        notify_file_processed(
+            filename=filename,
+            file_size=file_size,
+            metadata=metadata,
+            destinations=configured_destinations
+        )
+    except Exception as e:
+        print(f"[WARNING] Failed to send file processed notification: {e}")
+
     return {
         "status": "Completed",
         "file": processed_file