# -*- coding: utf-8 -*-
"""
This program has been developed by students from the bachelor Computer Science at Utrecht
University within the Software Project course.
© Copyright Utrecht University (Department of Information and Computing Sciences)
"""

import logging
import sys

try:
    import qi
except ImportError:
    qi = None


def get_qi_session():
    """
    Create and return a Qi session if available.

    :return: The active Qi session or ``None`` if unavailable.
    :rtype: qi.Session | None
    """
    if qi is None:
        logging.info("Unable to import qi. Running in stand-alone mode.")
        return None

    if "--qi-url" not in sys.argv:
        logging.info("No Qi URL argument given. Running in stand-alone mode.")
        return None

    try:
        app = qi.Application()
        app.start()
        return app.session
    except RuntimeError:
        logging.info("Unable to connect to the robot. Running in stand-alone mode.")
        return None