# Copyright 2020 TrilioData Inc.
# All Rights Reserved.

"""Functionality related to notifications common to multiple layers of
the system.
"""

import datetime

from keystoneauth1 import exceptions as ks_exc
from oslo_log import log
from oslo_utils import excutils
from oslo_utils import timeutils

import contego.conf
import contego.context
from contego import exception
from contego.notifications.objects import base as notification_base
from contego import objects
from contego.objects import base as obj_base
from contego.objects import fields
from contego import rpc
from contego import utils


LOG = log.getLogger(__name__)

CONF = contego.conf.CONF

def audit_period_bounds(current_period=False):
    """Get the start and end of the relevant audit usage period

    :param current_period: if True, this will generate a usage for the
        current usage period; if False, this will generate a usage for the
        previous audit period.
    """

    begin, end = utils.last_completed_audit_period()
    if current_period:
        audit_start = end
        audit_end = timeutils.utcnow()
    else:
        audit_start = begin
        audit_end = end

    return (audit_start, audit_end)



def null_safe_str(s):
    return str(s) if s else ''


def null_safe_isotime(s):
    if isinstance(s, datetime.datetime):
        return utils.strtime(s)
    else:
        return str(s) if s else ''