from django.shortcuts import reverse
from django.utils.translation import gettext_lazy as _

from .base import BaseMFA
from ..const import MFAType

otp_failed_msg = _("OTP code invalid, or server time error")


class MFAOtp(BaseMFA):
    name = MFAType.OTP.value
    display_name = MFAType.OTP.name
    placeholder = _('OTP verification code')

    def _check_code(self, code):
        from users.utils import check_otp_code
        assert self.is_authenticated()

        ok = check_otp_code(self.user.otp_secret_key, code)
        msg = '' if ok else otp_failed_msg
        return ok, msg

    def is_active(self):
        if not self.is_authenticated():
            return True
        return self.user.otp_secret_key

    @staticmethod
    def global_enabled():
        return True

    def get_enable_url(self) -> str:
        return reverse('authentication:user-otp-enable-start')

    def disable(self):
        assert self.is_authenticated()
        self.user.otp_secret_key = ''
        self.user.save(update_fields=['otp_secret_key'])

    def can_disable(self) -> bool:
        return True

    def get_disable_url(self):
        return reverse('authentication:user-otp-disable')

    @staticmethod
    def help_text_of_enable():
        return _("Virtual OTP based MFA")

    def help_text_of_disable(self):
        return ''