import os

from django.db import models
from django.conf import settings
from django.contrib.auth.base_user import AbstractBaseUser
from django.contrib.auth.base_user import BaseUserManager
from django.contrib.auth.models import PermissionsMixin
from django.db.models.signals import post_save
from django.dispatch import receiver
from rest_framework.authtoken.models import Token


class UserManager(BaseUserManager):
    def create_user(self, email, password, **extra_fields):
        if not email:
            raise ValueError('email field required')

        user = self.model(email=self.normalize_email(email), **extra_fields)
        user.set_password(password)
        user.save()

        return user

    def create_superuser(self, email, password, **extra_fields):
        user = self.model(email=self.normalize_email(email), **extra_fields)
        user.set_password(password)
        user.is_admin = True
        user.save()

        return user


def profile_image_path(instance, filename):
    return 'profile_image/{email}.jpeg'.format(email=instance.email)


class User(AbstractBaseUser, PermissionsMixin):
    email = models.EmailField(unique=True, max_length=255)
    nick_name = models.CharField(default='', max_length=20)
    profile_image = models.ImageField(blank=True, upload_to=profile_image_path)
    region = models.IntegerField(default=-1)
    period = models.IntegerField(default=0)
    is_admin = models.BooleanField(default=False)
    is_active = models.BooleanField(default=True)

    objects = UserManager()

    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = []

    def save(self, *args, **kwargs):
        super(User, self).save(*args, **kwargs)

    def delete(self, using=None, keep_parents=False):
        try:
            os.remove('profile_image/{email}.jpeg'.format(email=self.email))
        except FileNotFoundError:
            pass
        super(User, self).delete()

    def __str__(self):
        return '{email}'.format(email=self.email)

    @property
    def is_staff(self):
        return self.is_admin

    def has_perm(self, perm, obj=None):
        return True

    def has_module_perms(self, app_label):
        return True

@receiver(post_save, sender=settings.AUTH_USER_MODEL)
def create_auth_token(sender, instance=None, created=False, **kwargs):
    if created:
        Token.objects.create(user=instance)