from django.contrib.auth.models import BaseUserManager

from .mobile import normalize_mobile


class UserManager(BaseUserManager):
    """Users are identified by mobile number, not username."""

    use_in_migrations = True

    def _create_user(self, mobile, password=None, **extra_fields):
        if not mobile:
            raise ValueError("A mobile number is required.")
        user = self.model(mobile=normalize_mobile(mobile), **extra_fields)
        if password:
            user.set_password(password)
        else:
            user.set_unusable_password()
        user.save(using=self._db)
        return user

    def create_user(self, mobile, password=None, **extra_fields):
        extra_fields.setdefault("is_staff", False)
        extra_fields.setdefault("is_superuser", False)
        return self._create_user(mobile, password, **extra_fields)

    def create_superuser(self, mobile, password=None, **extra_fields):
        extra_fields.setdefault("is_staff", True)
        extra_fields.setdefault("is_superuser", True)
        extra_fields.setdefault("is_active", True)
        extra_fields.setdefault("status", self.model.Status.APPROVED)
        extra_fields.setdefault("auth_method", self.model.AuthMethod.PASSWORD)
        if not extra_fields["is_staff"] or not extra_fields["is_superuser"]:
            raise ValueError("Superusers must have is_staff and is_superuser set.")
        return self._create_user(mobile, password, **extra_fields)

    def get_by_natural_key(self, username):
        return self.get(mobile=normalize_mobile(username))