"""
This module provides class definition to manage User objects.

Available classes:
- UserManager: interface through which database query operations are
                       provided to model.
"""
from django.contrib.auth.models import BaseUserManager


class UserManager(BaseUserManager):
    """
    Interface through which database query operations are provided to
    User model.
    """

    def _create_user(self, email, password, is_staff, is_superuser,
                     **extra_fields):
        """
        Creates and saves an active User with the given email and password.
        """
        if not email:
            raise ValueError('Users must have an email address')
        email = self.normalize_email(email)
        name = ''
        if is_superuser:
            name='Super User'
        user = self.model(email=email, age=0, name=name,
                          is_staff=is_staff, is_active=True,
                          is_superuser=is_superuser, **extra_fields)
        user.set_password(password)
        user.save(using=self._db)
        return user

    def create_user(self, email, password=None, **extra_fields):
        return self._create_user(email, password, False, False,
                                 **extra_fields)

    def create_superuser(self, email, password, **extra_fields):
        return self._create_user(email, password, True, True,
                                 **extra_fields)