from django.contrib.auth import get_user_model
from django.contrib.auth.backends import ModelBackend
from django.contrib.auth.base_user import BaseUserManager


class EmailBackend(ModelBackend):
    def authenticate(self, request, username=None, password=None, **kwargs):
        UserModel = get_user_model()
        try:
            user = UserModel.objects.get(email=username)
        except UserModel.DoesNotExist:
            return None
        else:
            if user.check_password(password):  # type: ignore
                return user
        return None


class UserProfileManager(BaseUserManager):
    """ Manager for user profiles """

    def create_user(self, email, name, password=None):
        """ Create a new user profile """
        if not email:
            raise ValueError('User must have an email address')

        email = self.normalize_email(email)
        user = self.model(email=email, name=name)

        user.set_password(password)
        user.save(using=self._db)

        return user

    def create_superuser(self, email, name, password):
        """ Create a new superuser profile """
        user = self.create_user(email, name, password)
        user.is_superuser = True
        user.is_staff = True

        user.save(using=self._db)

        return user