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.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 photos.models import PhotoGallery, LuxImage, LuxImageSize
from locations.models import Location
from books.models import Book
from fieldnotes.models import FieldNote
from posts.models import Post
from normalize.models import RelatedPost

from utils.util import render_images, parse_video, markdown_to_html


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


def image_url_replace(s):
    s = s.replace('[[base_url]]', settings.IMAGES_URL)
    return s


class OldRelatedPost(models.Model):
    post_model = models.ForeignKey(ContentType, null=True, on_delete=models.SET_NULL)
    slug = models.SlugField()

    def __str__(self):
        return self.slug


class Entry(models.Model):
    title = models.CharField(max_length=200)
    subtitle = models.CharField(max_length=200, blank=True)
    slug = models.SlugField(unique_for_date='pub_date')
    body_html = models.TextField(blank=True)
    body_markdown = models.TextField()
    dek = models.TextField(null=True, blank=True)
    pub_date = models.DateTimeField('Date published')
    enable_comments = models.BooleanField(default=False)
    point = models.PointField(null=True, blank=True)
    location = models.ForeignKey(Location, on_delete=models.CASCADE, null=True, blank=True)
    PUB_STATUS = (
        (0, 'Draft'),
        (1, 'Published'),
    )
    status = models.IntegerField(choices=PUB_STATUS, default=0)
    photo_gallery = models.ForeignKey(PhotoGallery, on_delete=models.CASCADE, blank=True, null=True, verbose_name='photo set')
    image = models.FileField(upload_to=get_upload_path, blank=True, help_text="should be 520 by 290")
    meta_description = models.CharField(max_length=256, null=True, blank=True)
    TEMPLATES = (
        (0, 'single'),
        (1, 'double'),
        (2, 'single-dark'),
        (3, 'double-dark'),
        (4, 'single-black'),
        (5, 'double-black'),
    )
    template_name = models.IntegerField(choices=TEMPLATES, default=0)
    featured_image = models.ForeignKey(LuxImage, on_delete=models.CASCADE, null=True, blank=True)
    has_video = models.BooleanField(blank=True, default=False)
    old_field_notes = models.ManyToManyField(FieldNote, blank=True)
    field_notes = models.ManyToManyField(Post, blank=True, limit_choices_to={'post_type': 5})
    books = models.ManyToManyField(Book, related_name="luxbooks", blank=True)
    oldrelated = models.ManyToManyField(OldRelatedPost, blank=True)
    related = models.ManyToManyField(RelatedPost, blank=True)

    class Meta:
        ordering = ('-pub_date',)
        get_latest_by = 'pub_date'
        verbose_name_plural = 'entries'

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        # return "/jrnl/%s/%s" % (self.pub_date.strftime("%Y/%m").lower(), self.slug)
        return reverse("jrnl:detail", kwargs={"year": self.pub_date.year, "month": self.pub_date.strftime("%m"), "slug": self.slug})

    def get_absolute_url_old(self):
        return "/%s/%s/" % (self.pub_date.strftime("%Y/%b/%d").lower(), self.slug)

    def comment_period_open(self):
        return self.enable_comments and datetime.datetime.today() - datetime.timedelta(30) <= self.pub_date

    def get_thumbnail_url(self):
        image_dir, img = self.image.url.split('post-thumbnail/')[1].split('/')
        return '%spost-thumbnail/%s/%s' % (settings.IMAGES_URL, image_dir, img)

    def get_image_url(self):
        try:
            image_dir, img = self.image.url.split('post-images/')[1].split('/')
            return '%spost-images/%s/%s' % (settings.IMAGES_URL, image_dir, img)
        except ValueError:
            pass

    def get_image_wide_url(self):
        img = self.image.url.split('post-images/')[1].split('/')[1]
        # return '%shome-images/%s' % (settings.IMAGES_URL, img)
        return '%shome-images/%s' % (settings.IMAGES_URL, img)

    def get_image_hero_url(self):
        img = self.image.url.split('post-images/')[1].split('/')[1]
        return '/media/images/home-images/hero%s' % (img)

    def get_image_hero_url_sm(self):
        img = self.image.url.split('post-images/')[1].split('/')[1]
        img = os.path.splitext(img)[0]
        return '/media/images/home-images/hero%s_sm.jpg' % (img)

    def get_featured_image(self):
        if self.featured_image:
            return "%s%s" % (settings.IMAGES_URL, self.featured_image.image.url[14:])
        else:
            return self.image.url

    def get_featured_image_thumb(self):
        if self.featured_image:
            return self.featured_image.get_image_by_size("tn")
        else:
            print(self.image.url)
            image_dir, img = self.image.url.split('post-images/')[1].split('/')
            print(image_dir, img)
            return '%spost-images/%s/%s' % (settings.IMAGES_URL, image_dir, img) 

    @property
    def longitude(self):
        '''Get the site's longitude.'''
        return self.point.x

    @property
    def latitude(self):
        '''Get the site's latitude.'''
        return self.point.y

    @property
    def get_previous_published(self):
        return self.get_previous_by_pub_date(status__exact=1)

    @property
    def get_previous_admin_url(self):
        n = self.get_previous_by_pub_date()
        return reverse('admin:%s_%s_change' %(self._meta.app_label,  self._meta.model_name),  args=[n.id] )

    @property
    def get_next_published(self):
        return self.get_next_by_pub_date(status__exact=1)

    @property
    def get_next_admin_url(self):
        model = apps.get_model(app_label=self._meta.app_label, model_name=self._meta.model_name)
        try:
            return reverse('admin:%s_%s_change' %(self._meta.app_label,  self._meta.model_name),  args=[self.get_next_by_pub_date().pk] )
        except model.DoesNotExist:
            return ''

    def get_image_name(self):
        return self.image.url.split("post-images/")[1][5:-4]

    def get_image_ext(self):
        return self.image.url[-3:]

    def get_content_type(self):
        return ContentType.objects.get(app_label="jrnl", model="entry")

    def save(self, *args, **kwargs):
        created = self.pk is None
        if not created:
            md = render_images(self.body_markdown)
            self.body_html = markdown_to_html(md)
        self.has_video = parse_video(self.body_html)
        try:
            self.location = Location.objects.filter(geometry__contains=self.point).get()
        except Location.DoesNotExist:
            raise forms.ValidationError("There is no location associated with that point, add it:  %sadmin/locations/location/add/" % (settings.BASE_URL))
        if created and not self.featured_image:
            self.featured_image = LuxImage.objects.latest()
        old = type(self).objects.get(pk=self.pk) if self.pk else None
        if old and old.featured_image != self.featured_image:  # Field has changed
            s = LuxImageSize.objects.get(name="featured_jrnl")
            ss = LuxImageSize.objects.get(name="picwide-med")
            self.featured_image.sizes.add(s)
            self.featured_image.sizes.add(ss)
            self.featured_image.save()
        if old and old.title != self.title or old and old.slug != self.slug:
            related, c = RelatedPost.objects.get_or_create(model_name=self.get_content_type(), entry_id = self.id, pub_date=self.pub_date)
            related.title = self.title
            related.slug = self.slug
            related.save()
            
        super(Entry, self).save(*args, **kwargs)


class HomepageCurrator(models.Model):
    """
    simple model to control the featured article on the homepage
    also allows me to fudge the "popular" section to be what I want
    """
    image_offset_vertical = models.CharField(max_length=20, help_text="add negative top margin to shift image (include css unit)")
    images = models.ManyToManyField(LuxImage)
    #featured_image = models.ForeignKey(LuxImage, on_delete=models.CASCADE, null=True, blank=True)
    tag_line = models.CharField(max_length=200)
    featured = models.ForeignKey(Entry, on_delete=models.CASCADE, related_name="oldbanner")
    popular = models.ManyToManyField(Entry)
    template_name = models.CharField(max_length=200, help_text="full path")


class Home(models.Model):
    """
    simple model to control the featured article on the homepage
    also allows me to fudge the "popular" section to be what I want
    """
    image_offset_vertical = models.CharField(max_length=20, help_text="add negative top margin to shift image (include css unit)")
    featured_image = models.ForeignKey(LuxImage, on_delete=models.CASCADE, null=True, blank=True)
    tag_line = models.CharField(max_length=200)
    featured = models.ForeignKey(Entry, on_delete=models.CASCADE, related_name="banner")
    popular = models.ManyToManyField(Entry, related_name="popular")
    template_name = models.CharField(max_length=200, help_text="full path")


class BlogSitemap(Sitemap):
    changefreq = "never"
    priority = 1.0
    protocol = "https"

    def items(self):
        return Entry.objects.filter(status=1)

    def lastmod(self, obj):
        return obj.pub_date


class EntryModerator(CommentModerator):
    '''
    Moderate everything except people with multiple approvals
    '''
    email_notification = True

    def moderate(self, comment, content_object, request):
        previous_approvals = Comment.objects.filter(user_email=comment.email, is_public=True)
        for approval in previous_approvals:
            if approval.submit_date <= datetime.datetime.today() - datetime.timedelta(21):
                approve = True
        if previous_approvals.count() > 2 and approve:
            return False
            # do entry build right here so it goes to live site
        return True


moderator.register(Entry, EntryModerator)


@receiver(comment_was_posted, sender=Comment)
def cache_gravatar(sender, comment, **kwargs):
    gravatar_exists = has_gravatar(comment.email)
    grav_dir = settings.IMAGES_ROOT + '/gravcache/'
    if gravatar_exists:
        url = get_gravatar_url(comment.email, size=60)
        if not os.path.isdir(grav_dir):
            os.makedirs(grav_dir)
        local_grav = '%s/%s.jpg' % (grav_dir, calculate_gravatar_hash(comment.email))
        urllib.request.urlretrieve(url, local_grav)


@receiver(post_save, sender=Entry)
def post_save_events(sender, update_fields, created, instance, **kwargs):
    """
    Creates a generic related entry when a new post is added
    """
    if created:
        related, c = RelatedPost.objects.get_or_create(model_name=instance.get_content_type(), entry_id = instance.id, pub_date=instance.pub_date, title=instance.title, slug=instance.slug)

# from django_comments.signals import comment_will_be_posted
# from django_comments import akismet


# @receiver(comment_will_be_posted, sender=Comment)
# def spam_check(sender, comment, request, **kwargs):
#     akismet.USERAGENT = "David Lynch's Python library/1.0"
#     try:
#         real_key = akismet.verify_key(settings.AKISMET_KEY, "https://luxagraf.net/")
#         if real_key:
#             is_spam = akismet.comment_check(settings.AKISMET_KEY, "https://luxagraf.net/", request.META['REMOTE_ADDR'], request.META['HTTP_USER_AGENT'], comment_content=comment.comment)
#             if is_spam:
#                 return False
#             else:
#                 return True
#     except akismet.AkismetError as e:
#         print('Something went wrong, allowing comment')
#         print(e.response, e.statuscode)
#         return True