# -*- coding: utf-8 -*-
# @Time : 2022/12/1 14:14
# @Author : XuJiakai
# @File : datetime_utils
# @Software: PyCharm
import time
import datetime
import re


def get_ds():
    return time.strftime("%Y%m%d")


def get_yesterday_ds():
    return (datetime.date.today() + datetime.timedelta(days=-1)).strftime("%Y%m%d")
    pass


def get_now():
    return datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')


def datetime_format_transform(datetime_str: str, source_format: str, target_format: str):
    middle = datetime.datetime.strptime(datetime_str, source_format)
    return datetime.datetime.strftime(middle, target_format)
    pass


_date_part_1 = re.compile('^\\d{4}年\\d{2}月\\d{2}日$')
_date_part_2 = re.compile('^\\d{4}-\\d{2}-\\d{2}$')
_datetime_part = re.compile('^\\d{4}-\\d{2}-\\d{2} \\d{2}:\\d{2}:\\d{2}$')


def datetime_format(input_time):
    if input_time is not None and _date_part_1.match(input_time):
        input_time = datetime_format_transform(input_time, '%Y年%m月%d日', "%Y-%m-%d %H:%M:%S")
        pass

    if input_time is not None and _date_part_2.match(input_time):
        input_time = datetime_format_transform(input_time, '%Y-%m-%d', "%Y-%m-%d %H:%M:%S")
        pass

    if input_time is not None and not _datetime_part.match(input_time):
        input_time = None
        pass
    return input_time
    pass


if __name__ == '__main__':
    print(datetime_format('- - '))
    pass