class UserManager(BaseUserManager):
    def create_user(self, email, password=None, **extra_fields):
        """Creates and saves a new user"""

        if not email:
            raise ValueError("Users must have an email address")
        user = self.model(email=self.normalize_email(email), **extra_fields)
        user.set_password(password)
        user.save(using=self._db)  # required for supporting multiple databases

        return user

    def create_superuser(self, email, password):
        """Creates and saves a new superuser"""
        user = self.create_user(email, password)
        user.is_staff = True
        user.is_superuser = True
        user.save(using=self._db)

        return user


class User(AbstractBaseUser, PermissionsMixin):
    """Custom user model that supports using email instead of username"""

    email = models.EmailField(max_length=255, unique=True)
    first_name = models.CharField(max_length=255)
    last_name = models.CharField(max_length=255)
    is_active = models.BooleanField(default=True)
    is_staff = models.BooleanField(default=False)

    objects = UserManager()

    USERNAME_FIELD = "email"

    @property
    def full_name(self):
        return f'{self.first_name} {self.last_name}'