import functools
import logging

function_call_logger = logging.getLogger("call")


# decorator
def log_function_call(func):
    if logging.getLogger().level != logging.DEBUG:
        return func

    @functools.wraps(func)
    def wrapper(*args, **kwargs):
        function_call_logger.debug(
            "calling {func}({arguments})".format(
                func=func.__name__,
                arguments=", ".join(
                    [str(value) for value in args]
                    + [f"{key}={value}" for key, value in kwargs.items()],
                ),
            ),
        )
        return_val = func(*args, **kwargs)
        function_call_logger.debug(f"{func.__name__}() returned {return_val}")
        return return_val

    return wrapper