#!/usr/bin/env python
#
# A library that provides a Python interface to the Telegram Bot API
# Copyright (C) 2015-2025
# Leandro Toledo de Souza <devs@python-telegram-bot.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Lesser Public License for more details.
#
# You should have received a copy of the GNU Lesser Public License
# along with this program.  If not, see [http://www.gnu.org/licenses/].
"""This module contains helper functions related to warnings issued by the library.

.. versionadded:: 20.0

Warning:
    Contents of this module are intended to be used internally by the library and *not* by the
    user. Changes to this module are not considered breaking changes and may not be documented in
    the changelog.
"""
import warnings
from typing import Union

from telegram.warnings import PTBUserWarning


def warn(
    message: Union[str, PTBUserWarning],
    category: type[Warning] = PTBUserWarning,
    stacklevel: int = 0,
) -> None:
    """
    Helper function used as a shortcut for warning with default values.

    .. versionadded:: 20.0

    Args:
        message (:obj:`str` | :obj:`PTBUserWarning`): Specify the warnings message to pass to
            ``warnings.warn()``.

            .. versionchanged:: 21.2
                Now also accepts a :obj:`PTBUserWarning` instance.

        category (:obj:`type[Warning]`, optional): Specify the Warning class to pass to
            ``warnings.warn()``. Defaults to :class:`telegram.warnings.PTBUserWarning`.
        stacklevel (:obj:`int`, optional): Specify the stacklevel to pass to ``warnings.warn()``.
            Pass the same value as you'd pass directly to ``warnings.warn()``. Defaults to ``0``.
    """
    warnings.warn(message, category=category, stacklevel=stacklevel + 1)
