# Author: Felix Fontein <felix@fontein.de>
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or
# https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later
# SPDX-FileCopyrightText: 2020, Ansible Project

"""
Provide global logger.
"""

from __future__ import annotations

import logging
import sys


class FormattingAdapter(logging.LoggerAdapter):
    """
    By default, the logging framework does not allow to format messages
    other than by % formatting, except by jumping through loops. This
    makes {} formatting work with the least amount of work.

    The idea is similar to the one in https://stackoverflow.com/a/24683360
    """

    def __init__(self, logger):
        super().__init__(logger, {})
        self.logger_args = ["exc_info", "extra", "stack_info"]

    def log(self, level, msg, *args, **kwargs):
        """
        Forward log calls with formatted message.
        """
        if self.isEnabledFor(level):
            log_kwargs = {key: kwargs[key] for key in self.logger_args if key in kwargs}
            self.logger._log(  # pylint: disable=protected-access
                level, msg.format(*args, **kwargs), (), **log_kwargs
            )

    def addHandler(self, *args, **kwargs):  # pylint: disable=invalid-name
        """
        Forward addHandler call.
        """
        self.logger.addHandler(*args, **kwargs)


LOGGER = FormattingAdapter(logging.getLogger("changelog"))

_LOGGER_SET_UP = False


def setup_logger(verbosity: int) -> None:
    """
    Setup logger.
    """
    global _LOGGER_SET_UP  # pylint: disable=global-statement

    if not _LOGGER_SET_UP:
        formatter = logging.Formatter("%(levelname)s %(message)s")

        handler = logging.StreamHandler(sys.stdout)
        handler.setFormatter(formatter)

        LOGGER.addHandler(handler)

        _LOGGER_SET_UP = True

    LOGGER.setLevel(logging.WARN)
    if verbosity > 2:
        LOGGER.setLevel(logging.DEBUG)
    elif verbosity > 1:
        LOGGER.setLevel(logging.INFO)
    elif verbosity > 0:
        LOGGER.setLevel(logging.WARN)