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)  #lht: 验证码有效期5分钟


def send_verify_email(to_mail: str, code: str, subject: str = _("Verify Email")):
    #lht: """发送重设密码验证码
    #lht: Args:
    #lht:     to_mail: 接受邮箱
    #lht:     subject: 邮件主题
    #lht:     code: 验证码
    #lht: """
    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]:
    #lht: """验证code是否有效
    #lht: Args:
    #lht:     email: 请求邮箱
    #lht:     code: 验证码
    #lht: Return:
    #lht:     如果有错误就返回错误str
    #lht: Node:
    #lht:     这里的错误处理不太合理，应该采用raise抛出
    #lht:     否测调用方也需要对error进行处理
    #lht: """
    cache_code = get_code(email)
    if cache_code != code:
        return gettext("Verification code error")


def set_code(email: str, code: str):
    #lht: """设置code"""
    cache.set(email, code, _code_ttl.seconds)


def get_code(email: str) -> typing.Optional[str]:
    #lht: """获取code"""
    return cache.get(email)