import typing
import logging

import jwt
from django.contrib.auth.models import Group
from django.conf import settings
from pirates.auth import PiratesOIDCAuthenticationBackend

logging.basicConfig(level=logging.DEBUG)


class RegistryOIDCAuthenticationBackend(PiratesOIDCAuthenticationBackend):
    def _assign_new_user_groups(
        self,
        user,
        access_token: dict,
        user_groups: typing.Union[None, list] = None
    ) -> None:
        if user_groups is None:
            user_groups = user.groups.all()

        for group in access_token["groups"]:
            if group.startswith("_"):
                continue

            group_name = f"sso_{group}"

            group = Group.objects.filter(name=group_name)

            if not group.exists():
                group = Group(name=group_name)
                group.save()
            else:
                group = group[0]

            if group not in user_groups:
                user.groups.add(group)

    def _remove_old_user_groups(
        self,
        user,
        access_token: dict,
        user_groups: typing.Union[None, list] = None
    ) -> None:
        if user_groups is None:
            user_groups = user.groups.all()

        for group in user_groups:
            if group.name.replace("sso_", "") not in access_token["groups"]:
                user.groups.remove(group)

    def get_or_create_user(self, access_token, id_token, payload):
        user = super().get_or_create_user(access_token, id_token, payload)

        if user is None:
            return

        decoded_access_token = jwt.decode(
            access_token, options={"verify_signature": False}
        )

        user_groups = user.groups.all()

        self._remove_old_user_groups(
            user,
            decoded_access_token,
            user_groups=user_groups
        )
        self._assign_new_user_groups(
            user,
            decoded_access_token,
            user_groups=user_groups
        )

        user.update_group_based_admin()
        user.save(saved_by_auth=True)

        return user