import typing
from datetime import timedelta

from django.core.cache import cache
from django.utils.translation import gettext
from django.utils.translation import gettext_lazy as _

from djangoblog.utils import send_email

_code_ttl = timedelta(minutes=5)  # sjt 验证码有效期（5分钟）


def send_verify_email(to_mail: str, code: str, subject: str = _("Verify Email")):
    '''sjt 发送密码重置验证码邮件
    Args:
        to_mail: 接收邮箱
        subject: 邮件主题
        code: 验证码
    '''
    html_content = _(
        "You are resetting the password, the verification code is：%(code)s, valid within 5 minutes, please keep it "
        "properly") % {'code': code}
    send_email([to_mail], subject, html_content)


def verify(email: str, code: str) -> typing.Optional[str]:
    '''sjt 验证验证码有效性
    Args:
        email: 请求邮箱
        code: 验证码
    Return:
        如果有错误返回错误信息字符串，否则返回None
        '''
    cache_code = get_code(email)  # sjt 从缓存获取验证码
    if cache_code != code:  # sjt 验证码不匹配
        return gettext("Verification code error")


def set_code(email: str, code: str):
    #sjt 将验证码存入缓存（有效期5分钟）
    cache.set(email, code, _code_ttl.seconds)


def get_code(email: str) -> typing.Optional[str]:
    #sjt 从缓存获取验证码
    return cache.get(email)