Add function to relocate theme files in storage

Introduce `_relocate_theme_file` to handle moving files to theme-specific directories in the storage system. This ensures better organization of uploaded files by associating them with a theme ID and file type, improving maintainability and structure.

backend/app/core/storage.py

@@ -11,7 +11,7 @@ from app.core.config import settings
 
 class StorageProvider(ABC):
     """Base abstract class for storage providers."""
-
+    upload_folder: Path
     @abstractmethod
     async def save_file(self, file: UploadFile, destination: str) -> str:
         """Save a file to storage and return the relative path."""

backend/app/utils/files.py

@@ -1,8 +1,10 @@
 import os
+import shutil
 import uuid
 from datetime import datetime
 
 from app.core.config import settings
+from app.core.storage import StorageProvider
 
 
 def generate_unique_filename(original_filename: str) -> str:
@@ -25,4 +27,45 @@ def get_relative_storage_path(folder: str, filename: str) -> str:
 
 def validate_image_content_type(content_type: str) -> bool:
     """Check if the content type is an allowed image type."""
-    return content_type in settings.ALLOWED_IMAGE_TYPES
+    return content_type in settings.ALLOWED_IMAGE_TYPES
+
+def _relocate_theme_file(theme_id: uuid.UUID, current_url: str, file_type: str, storage: StorageProvider) -> str:
+    """
+    Move an uploaded file to a theme-specific folder.
+
+    Args:
+        theme_id: The theme ID
+        current_url: The current file URL
+        file_type: Type of file (preview, background, etc.)
+        storage: The storage provider
+
+    Returns:
+        The new URL if successful, otherwise None
+    """
+    try:
+        # Extract the filename from the URL
+        current_file = current_url.split('/files/')[1] if '/files/' in current_url else current_url
+        filename = os.path.basename(current_file)
+
+        # Define source and destination paths
+        source_path = os.path.join(storage.upload_folder, current_file)
+        theme_folder = os.path.join(storage.upload_folder, f'event-themes/{theme_id}/{file_type}')
+
+        # Create the destination folder if it doesn't exist
+        os.makedirs(theme_folder, exist_ok=True)
+
+        # Define destination path
+        dest_path = os.path.join(theme_folder, filename)
+
+        # Move the file
+        if os.path.exists(source_path):
+            shutil.move(source_path, dest_path)
+
+            # Return the new URL
+            relative_path = os.path.relpath(dest_path, storage.upload_folder)
+            return f"/files/{relative_path}"
+
+        return None
+    except Exception as e:
+        print(f"Error relocating file: {str(e)}")
+        return None