from django.contrib.auth.models import BaseUserManager

class UserManager(BaseUserManager):
    def create_user(self, phone, password=None, **extra_fields):
        if not phone:
            raise ValueError('phone number must be set.')
        if not password:
            raise ValueError('password must be set.')

        user = self.model(phone=phone, **extra_fields)
        user.set_password(raw_password=password)
        user.save()

        return user

    def create_superuser(self, phone, password, **extra_fields):
        extra_fields.setdefault('is_staff', True)
        extra_fields.setdefault('is_superuser', True)

        if extra_fields.get('is_staff') is not True:
            raise ValueError('superuser must have is_staff=True.')
        if extra_fields.get('is_superuser') is not True:
            raise ValueError('superuser must have is_superuser=True.')

        return self.create_user(phone, password, **extra_fields)