import re
from datetime import datetime
from app_common.const import USER_ID_REGEX


def quarter_date_time(dt_format='%b %d, %Y'):
    def validate(value):
        try:
            value = datetime.strptime(value, dt_format)
        except ValueError:
            raise ValueError(f'The given string "{value}" does not conform to the date time format string "{dt_format}" '
                             f'(see: https://docs.python.org/3/library/datetime.html#strftime-strptime-behavior).')
        return value

    return validate


def regex_str(regex, error_msg=None):
    def validate(value):
        if not isinstance(value, str):
            raise ValueError('The given value is not a string.')

        if re.search(regex, value):
            return value
        exp_msg = error_msg or f'The given string does not match the expected regex (value="{value}", regex="{regex}").'
        raise ValueError(exp_msg)
    return validate


def email():
    email_regex = '^(\w|\.|\_|\-)+[@](\w|\_|\-|\.)+[.]\w{2,3}$'
    return regex_str(email_regex, error_msg='The given value is not an email address.')


def user_id():
    def validate(value):
        if USER_ID_REGEX.fullmatch(value):
            return value
        raise ValueError(f'The given value is not a valid username (value="{value}").')

    return validate