import datetime
import os

from django.dispatch import receiver
from django.contrib.gis.db import models
from django.db.models.signals import post_save
from django.contrib.contenttypes.fields import GenericRelation, GenericForeignKey
from django.contrib.contenttypes.models import ContentType
from django.contrib.sites.models import Site
from django.urls import reverse
from django.utils.functional import cached_property
from django.apps import apps
from django.conf import settings
from django.contrib.sitemaps import Sitemap
from django import forms

import urllib.request
import urllib.parse
import urllib.error
from django_gravatar.helpers import get_gravatar_url, has_gravatar, calculate_gravatar_hash
from django_comments.signals import comment_was_posted
from django_comments.models import Comment
from django_comments.moderation import CommentModerator, moderator

from taggit.managers import TaggableManager

from utils.util import render_images, render_products, parse_video, markdown_to_html, extract_main_image


def get_upload_path(self, filename):
    return "files/%s/%s" % (datetime.datetime.today().strftime("%Y"), filename)


class Session(models.Model):
    title = models.CharField(max_length=200)
    date_start = models.DateField('Start Date')
    date_end = models.DateField('End Date')
    slug = models.SlugField()
    length = models.PositiveIntegerField(blank=True, null=True)
    STATUS = (
        (0, 'Open'),
        (1, 'Closed'),
    )
    status = models.IntegerField(choices=STATUS, default=0)

    class Meta:
        ordering = ('-date_start',)
        get_latest_by = 'date_start'

    def __str__(self):
        return self.title

    def get_absolute_url(self):
            return reverse('classes:session-detail', kwargs={"year": self.start_date.year, "month": self.start_date.strftime("%m"), "slug": self.slug})

    # save length from date


class ClassMedia(models.Model):
    title = models.CharField(max_length=200)
    date_created = models.DateTimeField(default=datetime.datetime.now)
    file = models.FileField(blank=True, null=True, upload_to=get_upload_path)

    def __str__(self):
        return self.title


class Class(models.Model):
    title = models.CharField(max_length=200)
    subtitle = models.CharField(max_length=200)
    description = models.TextField()
    requires = models.TextField('If previous classwork is required, list prerequisites here', null=True, blank=True,)
    session = models.ForeignKey(Session, blank=True, null=True, on_delete=models.SET_NULL)
    slug = models.SlugField()
    uploads = models.ManyToManyField(ClassMedia, blank=True)
    date_created = models.DateTimeField(default=datetime.datetime.now)
    number_of_classes = models.IntegerField(blank=True, null=True)
    CLASS_DAYS = (
        (0, 'Mon/Wed'),
        (1, 'Tue/Thur'),
    )
    class_days  = models.IntegerField(choices=CLASS_DAYS, default=0)
    price = models.FloatField()

    class Meta:
        ordering = ('-date_created',)
        get_latest_by = 'date_created'

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        return reverse('classes:detail', kwargs={"slug": self.slug})

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