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#!/usr/bin/env python
# -*- coding: utf-8 -*-

import arrow
import datetime


# date time utils
def getdaterange(startdate, enddate):
    dates = []
    startdate = datetime.date(*[int(i) for i in startdate.split('-')])
    enddate = datetime.date(*[int(i) for i in enddate.split('-')])
    dates.append(str(startdate))
    while startdate < enddate:
        startdate = startdate + datetime.timedelta(days=1)
        dates.append(str(startdate))
    return dates


def beforeday(n):
    """
    更改时间日期
    :param n:
    :return:
    """
    now = arrow.utcnow().to('local')
    return now.replace(days=n).format('YYYY-MM-DD')


def today():
    """
    获取当天日期
    :return:
    """
    return beforeday(0)


def yesterday():
    """
    获取昨天日期
    :return:
    """
    return beforeday(-1)


def tomorrow():
    """
    获取明天日期
    :return:
    """
    return beforeday(1)


def lastweeks(n=1):
    """
    获取前N周的日期
    :param n:
    :return:
    """
    return getdaterange(beforeday(-1 * n * 7), yesterday())


def lastdays(n=1):
    """
    获取前n天的日期
    :param n:
    :return:
    """
    return getdaterange(beforeday(-1 * n), yesterday())