# -*- coding: utf-8 -*-
from __future__ import print_function, unicode_literals

from django.db import models
from django.conf import settings
from django.utils import timezone
from django.core.mail import send_mail
from django.utils.translation import ugettext_lazy as _
from django.utils.encoding import python_2_unicode_compatible
from django.contrib.auth.models import BaseUserManager, PermissionsMixin, AbstractBaseUser


class UserManager(BaseUserManager):
    use_in_migrations = True

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

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

    def create_superuser(self, email, 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(email, password, **extra_fields)


class User(AbstractBaseUser, PermissionsMixin):

    email = models.EmailField(
        verbose_name=_('Email Address'),
        max_length=255,
        unique=True,
    )

    first_name = models.CharField(
        verbose_name=_('first name'),
        max_length=50,
        blank=True
    )

    last_name = models.CharField(
        verbose_name=_('last name'),
        max_length=50,
        blank=True
    )

    is_staff = models.BooleanField(
        verbose_name=_('staff status'),
        default=False,
        help_text=_('Designates whether the user can log into this admin site.'),
    )

    is_active = models.BooleanField(
        verbose_name=_('active'),
        default=True,
        help_text=_(
            'Designates whether this user should be treated as active. '
            'Unselect this instead of deleting accounts.'
        ),
    )

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

    objects = UserManager()

    USERNAME_FIELD = 'email'

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

    def group_name(self):
        return ','.join([group.name for group in self.groups.all()])

    def is_callblade_admin(self):
        if self.groups.filter(name=settings.CALLBLADE_GROUP_ADMIN).exists():
            return True
        return False

    def is_admin(self):
        return self.is_superuser or self.is_callblade_admin()
    is_admin.boolean = True

    def is_buyer(self):
        if self.groups.filter(name=settings.BUYER_GROUP).exists() and self.buyer_set.exists():
            return True
        return False
    is_buyer.boolean = True

    def is_vendor(self):
        if self.groups.filter(name=settings.VENDOR_GROUP).exists() and self.vendor_set.exists():
            return True
        return False
    is_vendor.boolean = True

    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)