from django.core.exceptions import ImproperlyConfigured
from django.core.mail import send_mail
from django.db import models
from django.utils import timezone
from django.utils.http import urlquote
from django.utils.translation import ugettext_lazy as _
import warnings
from django.contrib.auth.models import (
    BaseUserManager, AbstractBaseUser, PermissionsMixin
)



class EmailUserManager(BaseUserManager):
    def create_user(self, email, password=None, **extra_fields):
        """
        Creates and saves a User with the given username, email and password.
        """
        #assert False, "in user manager"
        now = timezone.now()
        if not email:
            raise ValueError('The given email must be set')
        #email = UserManager.normalize_email(email)
        user = EmailUser(email=email,
                          is_staff=False, is_active=True, is_superuser=False,
                          last_login=now, date_joined=now, **extra_fields)

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

    def create_superuser(self, email, password, **extra_fields):
        u = self.create_user(email, password, **extra_fields)
        u.is_staff = True
        u.is_active = True
        u.is_superuser = True
        u.save(using=self._db)
        return u


class EmailUser(AbstractBaseUser, PermissionsMixin):
    """
    An abstract base class implementing a fully featured User model with
    admin-compliant permissions.

    Username, password and email are required. Other fields are optional.
    """

    first_name = models.CharField(_('first name'), max_length=30, blank=True)
    last_name = models.CharField(_('last name'), max_length=30, blank=True)
    email = models.EmailField(_('email address'), unique=True)
    is_staff = models.BooleanField(_('staff status'), default=False,
                                   help_text=_('Designates whether the user can log into this admin '
                                               'site.'))
    is_active = models.BooleanField(_('active'), default=True,
                                    help_text=_('Designates whether this user should be treated as '
                                                'active. Unselect this instead of deleting accounts.'))
    date_joined = models.DateTimeField(_('date joined'), default=timezone.now)

    objects = EmailUserManager()

    USERNAME_FIELD = 'email'

    class Meta:
        verbose_name = _('user')
        verbose_name_plural = _('users')
        #abstract = True,cc

    def get_absolute_url(self):
        return "/users/%s/" % urlquote(self.username)

    def get_full_name(self):
        """
        Returns the first_name plus the last_name, with a space in between.
        """
        full_name = '%s %s' % (self.first_name, self.last_name)
        return full_name.strip()

    def get_short_name(self):
        "Returns the short name for the user."
        return self.first_name

    def email_user(self, subject, message, from_email=None):
        """
        Sends an email to this User.
        """
        send_mail(subject, message, from_email, [self.email])

    def get_profile(self):
        """
        Returns site-specific profile for this user. Raises
        SiteProfileNotAvailable if this site does not allow profiles.
        """
        warnings.warn(
            "The use of AUTH_PROFILE_MODULE to define user profiles has been deprecated.",
            DeprecationWarning)


class PasswordReset(models.Model):
    user = models.OneToOneField(EmailUser, related_name="profile")
    key = models.CharField(max_length=100)
    used = models.BooleanField(default=False)
