#!/usr/bin/env python
from warnings import catch_warnings, simplefilter
from warnings import warn as _warn


__author__ = "Gavin Huttley"
__copyright__ = "Copyright 2007-2020, The Cogent Project"
__credits__ = ["Gavin Huttley", "Jai Ram Rideout"]
__license__ = "BSD-3"
__version__ = "2020.12.21a"
__maintainer__ = "Gavin Huttley"
__email__ = "gavin.huttley@anu.edu.au"
__status__ = "Production"


def deprecated(_type, old, new, version, stack_level=2):
    """a convenience function for deprecating classes, functions, arguments.

    Parameters
    ----------
    _type
        should be one of class, method, function, argument
    old, new
        the old and new names
    version
        the version by which support for the old name will be
        discontinued
    stack_level
        as per warnings.warn

    """
    msg = "use %s %s instead of %s, support discontinued in version %s" % (
        _type,
        new,
        old,
        version,
    )

    # DeprecationWarnings are ignored by default in python 2.7, so temporarily
    # force them to be handled.
    with catch_warnings():
        simplefilter("always")
        _warn(msg, DeprecationWarning, stack_level)


def discontinued(_type, name, version, stack_level=2):
    """convenience func to warn about discontinued attributes

    Parameters
    ----------
    _type
        should be one of class, method, function, argument
    name
        the attributes name
    version
        the version by which support for the old name will be
        discontinued
    stack_level
        as per warnings.warn

    """
    msg = "%s %s is discontinued, support will be stopped in version %s" % (
        _type,
        name,
        version,
    )

    with catch_warnings():
        simplefilter("always")
        _warn(msg, DeprecationWarning, stack_level)
