from django.db import models

from django.contrib.postgres.fields import ArrayField
from django.contrib.auth.base_user import BaseUserManager
from django.contrib.auth.base_user import AbstractBaseUser
from datetime import datetime
from django.conf import settings
from django.db.models.signals import post_save
from django.dispatch import receiver
from rest_framework.authtoken.models import Token
import datetime
import django.utils


@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)


class UserManager(BaseUserManager):
    def create_user(self, email, username, password=None):
        if not email:
            raise ValueError("Users must have an email address")
        if not username:
            raise ValueError("Users must have an username")

        user = self.model(
            email=self.normalize_email(email),
            username=username,
        )

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

    def create_superuser(self, email, username, password):
        user = self.create_user(
            email=self.normalize_email(email),
            password=password,
            username=username,
        )
        user.is_admin = True
        user.is_staff = True
        user.is_superuser = True
        user.save(using=self._db)
        return user


class User(AbstractBaseUser):

    # required
    username = models.CharField(max_length=30, unique=True, blank=True)
    email = models.EmailField(verbose_name="email", max_length=60, unique=True, blank=True)
    first_name = models.CharField(max_length=30, null=True, blank=True)
    last_name = models.CharField(max_length=30, null=True, blank=True)

    #optional
    image = models.ImageField(
        upload_to="profile_images/", default='profile_images/default.png', blank=True)
    rating = models.FloatField(null=True, blank=True)
    place_in_top = models.PositiveIntegerField(null=True, blank=True)
    TYPE_CHOICES = (
        (7, "7"), (8, "8"), (9, "9"), (10, "10"), (11, "11"),
    )
    grade = models.PositiveIntegerField(choices=TYPE_CHOICES, default=1)

    # system
    last_login = models.DateTimeField(verbose_name='last login', auto_now=True)
    is_admin = models.BooleanField(default=False)
    is_active = models.BooleanField(default=True)
    is_staff = models.BooleanField(default=False)
    is_superuser = models.BooleanField(default=False)

    USERNAME_FIELD = 'username'
    REQUIRED_FIELDS = ['email', ]

    objects = UserManager()

    def __str__(self):
        return self.username

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

    def has_module_perms(self, app_label):
        return self.is_superuser


class Event(models.Model):
    id = models.AutoField(primary_key=True)
    name = models.CharField(max_length=100, null=True)
    description = models.TextField(max_length=1000, blank=True, null=True)
    date_start = models.DateTimeField(null=True, blank=True)
    date_finish = models.DateTimeField(null=True, blank=True)

    image = models.ImageField(
        upload_to="event_images/", default='event_images/default.png', blank=True, null=True)
    is_approved = models.BooleanField(null=True)

    TYPE_CHOICES = (
        ('Event', "Мероприятие"),
        ('Lesson', "Урок"),
    )
    event_type = models.CharField(choices=TYPE_CHOICES, max_length=200, default="Мероприятие")
    hometask = ArrayField(models.CharField(max_length=200), blank=True, null=True)
    topics = ArrayField(models.CharField(max_length=200), blank=True, null=True)
    materials = ArrayField(models.URLField(), blank=True, null=True)
    possible_users = models.ManyToManyField("core.User", blank=True, related_name='possible_users')
    actual_users = models.ManyToManyField("core.User", blank=True, related_name='actual_users')


class Image(models.Model):
    name = models.CharField(max_length=250, blank=True, null=True)
    img = models.ImageField(blank=True, null=True, upload_to='post_images')


class Post(models.Model):
    id = models.AutoField(primary_key=True)
    header = models.CharField(max_length=1000, null=True, blank=True)
    text = models.TextField(null=True, blank=True)
    image = models.ImageField(null=True, blank=True, upload_to='post_images/', default='post_images/default.png')
    who_liked = models.ManyToManyField(User, related_name='who_liked', blank=True,)
    date = models.DateTimeField(null=True, blank=True)


class Thread(models.Model):
    id = models.AutoField(primary_key=True)
    header = models.CharField(max_length=1000, null=True)
    text = models.TextField(null=True, blank=True)
    author = models.ManyToManyField(User, blank=True)
    rating = models.FloatField(null=True, blank=True)
    parent = models.OneToOneField("self", null=True, blank=True, on_delete=models.CASCADE)
    up_liked = models.ManyToManyField(User, related_name='up_liked', blank=True,)
    down_liked = models.ManyToManyField(User, related_name='down_liked', blank=True,)


class Class(models.Model):
    id = models.AutoField(primary_key=True)
    name = models.CharField(max_length=100, null=True)
    members = models.ManyToManyField("core.User", blank=True, related_name='members')