# -*- coding: utf-8 -*-

from django.utils import timezone as django_tz
import datetime
import pytz

UTC = pytz.utc
EPOCH_START = datetime.datetime(1970, 1, 1, 0, 0, 0).replace(tzinfo=UTC)

def utcfromtimestamp(timestamp):
    return datetime.datetime.utcfromtimestamp(timestamp).replace(tzinfo=pytz.utc)

def utcfromtimestamp_as_local(timestamp):
    return to_local_tz(datetime.datetime.utcfromtimestamp(timestamp).replace(tzinfo=pytz.utc))

def now_timestamp():
    return (now() - EPOCH_START).total_seconds()

def get_tz():
    return django_tz.get_current_timezone()


def now_local():
    return django_tz.now().astimezone(django_tz.get_current_timezone())


def now_utc():
    return django_tz.now().astimezone(django_tz.utc)


def to_local_tz(*args):
    """
        Аргументы datetime либо год, месяц, день и т.д для создания datetime
    """
    dt = args[0] if len(args) == 1 and isinstance(args[0], datetime.datetime) else datetime.datetime(*args)
    if django_tz.is_naive(dt):
        _dt = django_tz.make_aware(dt, django_tz.get_current_timezone())
    else:
        _dt = dt
    return _dt.astimezone(django_tz.get_current_timezone())


def get_current_offset():
    """
    Returns current UTC offset in seconds
    """
    tz = get_tz()
    return tz.utcoffset(django_tz.now()).total_seconds()