import logging
from django.conf import settings
from django.contrib.auth.signals import user_logged_in, user_logged_out, user_login_failed
from django.dispatch import receiver

logger = logging.getLogger(settings.ROOT_LOGGER_NAME).getChild(__name__)


@receiver(user_logged_in)
def user_logged_in_callback(sender, request, user, **kwargs):
    # to cover more complex cases:
    # http://stackoverflow.com/questions/4581789/how-do-i-get-user-ip-address-in-django
    ip = request.META.get('REMOTE_ADDR')

    logger.info('Accepted password for {user} from {ip}'.format(
        user=user,
        ip=ip
    ))


@receiver(user_logged_out)
def user_logged_out_callback(sender, request, user, **kwargs):
    ip = request.META.get('REMOTE_ADDR')

    logger.debug('Disconnected from user {user} {ip}'.format(
        user=user,
        ip=ip
    ))


@receiver(user_login_failed)
def user_login_failed_callback(sender, request, credentials, **kwargs):
    ip = request.META.get('REMOTE_ADDR')

    logger.warning('Failed password for {user} from {ip}'.format(
        user=credentials.get('username'),
        ip=ip
    ))