# File: backend/cloud_utils.py
import dropbox

# --- GOOGLE DRIVE LOGIC ---
def create_google_folder(service, folder_name: str, parent_id: str = None) -> str:
    """Creates a folder in Google Drive. Can nest inside a parent folder."""
    query = f"mimeType='application/vnd.google-apps.folder' and name='{folder_name}' and trashed=false"
    
    # If a parent is provided, only search inside that parent
    if parent_id:
        query += f" and '{parent_id}' in parents"
        
    results = service.files().list(q=query, spaces='drive', fields='files(id, name)').execute()
    files = results.get('files', [])
    
    if files:
        return files[0].get('id')

    file_metadata = {
        'name': folder_name,
        'mimeType': 'application/vnd.google-apps.folder'
    }
    
    # Attach to the parent folder if requested
    if parent_id:
        file_metadata['parents'] = [parent_id]

    folder = service.files().create(body=file_metadata, fields='id').execute()
    return folder.get('id')

def move_google_file(service, file_id: str, new_folder_id: str, new_name: str = None):
    """Moves a file by changing its parent tag, and optionally renames it."""
    try:
        file = service.files().get(fileId=file_id, fields='parents').execute()
        previous_parents = ",".join(file.get('parents', []))
        
        body = {}
        if new_name:
            body['name'] = new_name
            
        updated_file = service.files().update(
            fileId=file_id,
            addParents=new_folder_id,
            removeParents=previous_parents,
            body=body if body else None,
            fields='id, parents, name'
        ).execute()
        return True
    except Exception as e:
        print(f"Error moving Google file: {e}")
        return False

# --- DROPBOX LOGIC ---
def create_dropbox_folder(dbx: dropbox.Dropbox, folder_name: str) -> str:
    """Creates a folder in Dropbox."""
    path = f"/{folder_name}"
    try:
        res = dbx.files_create_folder_v2(path)
        return res.metadata.id
    except dropbox.exceptions.ApiError as e:
        if hasattr(e.error, 'get_path') and e.error.get_path().is_conflict():
            print("Dropbox folder exists")
            return "exists"
        print(f"Dropbox Folder Error: {e}")
        return None

def move_dropbox_file(dbx: dropbox.Dropbox, from_path: str, new_folder_name: str, file_name: str, new_name: str = None):
    """Dropbox requires full path destinations. Auto-renames if new_name is provided."""
    final_name = new_name if new_name else file_name
    to_path = f"/{new_folder_name}/{final_name}"
    try:
        dbx.files_move_v2(from_path, to_path)
        return True
    except Exception as e:
        print(f"Error moving Dropbox file: {e}")
        return False
    
def delete_google_file(service, file_id: str):
    """Permanently deletes a file from Google Drive."""
    try:
        service.files().delete(fileId=file_id).execute()
        return True
    except Exception as e:
        print(f"Error deleting Google file: {e}")
        return False

def delete_dropbox_file(dbx: dropbox.Dropbox, path: str):
    """Permanently deletes a file from Dropbox using its path."""
    try:
        dbx.files_delete_v2(path)
        return True
    except Exception as e:
        print(f"Error deleting Dropbox file: {e}")
        return False