FTP Connection Manager

class FTPConnectionManager:
    """
    Manages FTP and FTPS connections with configuration support.

    Args:
        host: FTP server hostname
        port: FTP server port (default: 21)
        username: FTP username (default: "")
        password: FTP password (default: "")
        use_ftps: Whether to use FTPS (secure) instead of FTP (default: False)
        passive: Whether to use passive mode (default: True)
    """

    def __init__(self, host: str, port: int = 21, username: str = "",
                 password: str = "", use_ftps: bool = False,
                 passive: bool = True):
        """Initialize FTP connection manager with configuration."""
        pass

    def connect(self):
        """
        Establish connection to the FTP server.

        Returns:
            The FTP connection object (ftplib.FTP or ftplib.FTP_TLS)
        """
        pass

    def close(self):
        """Close the FTP connection if it is open."""
        pass

    def __enter__(self):
        """Enter context manager and establish connection."""
        pass

    def __exit__(self, exc_type, exc_val, exc_tb):
        """Exit context manager and close connection."""
        pass

    def test_connection(self) -> bool:
        """
        Test if connection can be established and is working.

        Returns:
            True if connection is successful, False otherwise
        """
        pass