from __future__ import unicode_literals
from django.db import models
from django.core.mail import send_mail
from django.contrib.auth.models import PermissionsMixin
from django.contrib.auth.base_user import AbstractBaseUser
from django.utils.translation import ugettext_lazy as _
from django.core.validators import RegexValidator
from .managers import UserManager

class User(AbstractBaseUser, PermissionsMixin):

    phone_regex = RegexValidator(regex=r'^+?1?d{9,15}$', message="")

    phone_number = models.CharField(validators=[phone_regex], unique=True)

    email = models.EmailField(_('email address'), unique=True)

    first_name = models.CharField(_('first name'), max_length=30, blank=True)

    last_name = models.CharField(_('last name'), max_length=30, blank=True)

    date_joined = models.DateTimeField(_('date joined'), auto_now_add=True)

    is_active = models.BooleanField(_('active'), default=True)
    avatar = models.ImageField(upload_to='avatars/', null=True, blank=True)
    objects = UserManager()
    USERNAME_FIELD = 'phone_number'
    REQUIRED_FIELDS = []

    class Meta:
        verbose_name = _('user')
        verbose_name_plural = _('users')

    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, **kwargs):
        '''
        Sends an email to this User.
        '''
        send_mail(subject, message, from_email, [self.email], **kwargs)

    def sms_user(self, message):
        '''
        Sends a sms to this User.
        '''
        pass

class UserManager(BaseUserManager):
    use_in_migrations = True

    def _create_user(self, phone_number, password, **extra_fields):
        """
        Creates and saves a User with the given phone_number and password.
        """
        if not phone_number:
            raise ValueError('The given phone number must be set')
        #email = self.normalize_email(email)
        user = self.model(phone_number=phone_number, **extra_fields)
        user.set_password(password)
        user.save(using=self._db)
        return user


    def create_user(self, phone_number, password=None, **extra_fields):
        extra_fields.setdefault('is_superuser', False)
        return self._create_user(phone_number, password, **extra_fields)


    def create_superuser(self, phone_number, password, **extra_fields):
        extra_fields.setdefault('is_superuser', True)
        if extra_fields.get('is_superuser') is not True:
            raise ValueError('Superuser must have is_superuser=True.')
        return self._create_user(phone_number, password, **extra_fields)