File Management

class Bucket:
    def __init__(self, request, max_files: int = None, max_size: int = None, 
                 index: bool = True, on_add=None, on_delete=None):
        """
        Create a file bucket.
        
        Args:
            request: Request object
            max_files (int): Maximum number of files
            max_size (int): Maximum total size in bytes
            index (bool): Whether to create file index
            on_add: Callback for file additions
            on_delete: Callback for file deletions
        """

    def get_path(self, file_name: str = '') -> str:
        """
        Get file system path.
        
        Args:
            file_name (str): Specific file name
            
        Returns:
            str: File system path
        """

    def get_url(self, file_name: str = '') -> str:
        """
        Get web URL for file.
        
        Args:
            file_name (str): Specific file name
            
        Returns:
            str: Web accessible URL
        """

    def get_file_names(self) -> list:
        """
        Get list of file names.
        
        Returns:
            list: List of file names in bucket
        """

    def get_size(self) -> int:
        """
        Get total size of files.
        
        Returns:
            int: Total size in bytes
        """

    def get_add_url(self) -> str:
        """
        Get upload URL.
        
        Returns:
            str: URL for uploading files
        """

    def get_delete_url(self, file_name: str) -> str:
        """
        Get deletion URL for file.
        
        Args:
            file_name (str): File to delete
            
        Returns:
            str: URL for deleting the file
        """

from lona import App, View, Bucket
from lona.html import HTML, H1, P, A, Ul, Li

app = App(__file__)

@app.route('/files')
class FileManagerView(View):
    def handle_request(self, request):
        # Create bucket with limits
        bucket = Bucket(
            request,
            max_files=10,
            max_size=10 * 1024 * 1024  # 10MB
        )
        
        # Display current files
        file_list = Ul()
        for filename in bucket.get_file_names():
            file_url = bucket.get_url(filename)
            delete_url = bucket.get_delete_url(filename)
            
            file_list.append(
                Li(
                    A(filename, href=file_url),
                    ' - ',
                    A('Delete', href=delete_url)
                )
            )
        
        upload_url = bucket.get_add_url()
        
        html = HTML(
            H1('File Manager'),
            P(f'Total size: {bucket.get_size()} bytes'),
            P(f'Upload files: {upload_url}'),
            file_list
        )
        
        return html

from typing import Optional, Callable, List

FileName = str
FilePath = str
FileSize = int
FileCallback = Callable[[str], None]