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 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)
    field_notes = models.ManyToManyField(FieldNote, blank=True)
    books = models.ManyToManyField(Book, related_name="luxbooks", blank=True)
    related = models.ManyToManyField(OldRelatedPost, 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()
        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):
#    related, created = RelatedPost.objects.get_or_create(model_name=instance.get_content_type(), entry_id = instance.id)
#    related.title = instance.title
#    related.slug = instance.slug
#    post_save.disconnect(post_save_events, sender=Entry)
#    instance.save()
#    post_save.connect(post_save_events, sender=Entry)

# 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