from logging import getLogger

from django import apps

from axes import get_version
from axes.conf import settings

log = getLogger(settings.AXES_LOGGER)


class AppConfig(apps.AppConfig):
    name = 'axes'
    logging_initialized = False

    @classmethod
    def initialize(cls):
        """
        Initialize Axes logging and show version information.

        This method is re-entrant and can be called multiple times.
        It displays version information exactly once at application startup.
        """

        if not settings.AXES_ENABLED:
            return

        if not settings.AXES_VERBOSE:
            return

        if cls.logging_initialized:
            return
        cls.logging_initialized = True

        log.info('AXES: BEGIN LOG')
        log.info('AXES: Using django-axes %s', get_version())

        if settings.AXES_ONLY_USER_FAILURES:
            log.info('AXES: blocking by username only.')
        elif settings.AXES_LOCK_OUT_BY_COMBINATION_USER_AND_IP:
            log.info('AXES: blocking by combination of username and IP.')
        else:
            log.info('AXES: blocking by IP only.')

    def ready(self):
        self.initialize()

        from axes import checks, signals  # noqa