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 normalize.models import RelatedPost
from media.models import LuxImage, LuxImageSize
from locations.models import Location
from books.models import Book
from lttr.models import NewsletterMailing
#from fieldnotes.models import FieldNote
from taxonomy.models import TaggedItems, Category
from utils.util import render_images, render_products, parse_video, markdown_to_html, extract_main_image


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


class Trip(models.Model):
    title = models.CharField(max_length=300)
    subtitle = models.CharField(max_length=200, blank=True)
    slug = models.SlugField()
    body_markdown = models.TextField()
    body_html = models.TextField(blank=True)
    date_started = models.DateField()
    date_ended = models.DateField()
    featured_image = models.ForeignKey(LuxImage, on_delete=models.SET_NULL, null=True, blank=True)

    def __str_(self):
        return self.title

    class Meta:
        ordering = ('-date_started',)

    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)
        super(Trip, self).save(*args, **kwargs)


class PostType(models.IntegerChoices):
    RANGE = 0, ('range')
    REVIEW = 1, ('review')
    ESSAY = 2, ('essay')
    SRC = 3, ('src')
    JRNL = 4, ('jrnl')
    FIELD_NOTE = 5, ('field note')
    GUIDE = 6, ('guide')
    FILM = 7, ('film')


class Post(models.Model):
    site = models.ForeignKey(Site, on_delete=models.SET_NULL, default=1, null=True)
    title = models.CharField(max_length=200)
    short_title = models.CharField(max_length=200, blank=True, null=True)
    subtitle = models.CharField(max_length=200, blank=True)
    slug = models.SlugField(unique_for_date='pub_date')
    prologue_markdown = models.TextField(blank=True, null=True)
    prologue_html = models.TextField(blank=True, null=True)
    body_markdown = models.TextField()
    body_html = models.TextField(blank=True)
    epilogue_markdown = models.TextField(blank=True, null=True)
    epilogue_html = models.TextField(blank=True, null=True)
    dek = models.TextField(null=True, blank=True)
    meta_description = models.CharField(max_length=256, blank=True)
    pub_date = models.DateTimeField('Date published')
    last_updated = models.DateTimeField(auto_now=True)
    enable_comments = models.BooleanField(default=False)
    PUB_STATUS = (
        (0, 'Draft'),
        (1, 'Published'),
    )
    status = models.IntegerField(choices=PUB_STATUS, default=0)
    featured_image = models.ForeignKey(LuxImage, on_delete=models.SET_NULL, null=True, blank=True)
    TEMPLATES = (
        (0, 'single'),
        (1, 'double'),
        (2, 'single-dark'),
        (3, 'double-dark'),
        (4, 'single-black'),
        (5, 'double-black'),
    )
    post_type = models.IntegerField(choices=PostType.choices, default=PostType.JRNL)
    template_name = models.IntegerField(choices=TEMPLATES, default=0)
    has_video = models.BooleanField(blank=True, default=False)
    has_code = models.BooleanField(blank=True, default=False)
    disclaimer = models.BooleanField(blank=True, default=False)
    books = models.ManyToManyField(Book, blank=True)
    old_image = models.FileField(upload_to=get_upload_path, blank=True, null=True, help_text="should be 520 by 290")
    trip = models.ManyToManyField(Trip, blank=True, null=True)
    related = models.ManyToManyField(RelatedPost, blank=True)
    point = models.PointField(null=True, blank=True)
    location = models.ForeignKey(Location, on_delete=models.CASCADE, null=True, blank=True)
    topics = models.ManyToManyField(Category, blank=True)
    originally_published_by = models.CharField(max_length=400, null=True, blank=True)
    originally_published_by_url = models.CharField(max_length=400, null=True, blank=True)
    field_notes = models.ManyToManyField('self', blank=True, symmetrical=False, limit_choices_to = {'post_type': PostType.FIELD_NOTE})
    books = models.ManyToManyField(Book, blank=True)

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

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        if self.post_type == PostType.FILM:
            return reverse('film:detail', kwargs={"slug": self.slug})
        if self.post_type == PostType.ESSAY:
            return reverse('essays:detail', kwargs={"slug": self.slug})
        if self.post_type == PostType.RANGE:
            m = NewsletterMailing.objects.get(post__id=self.pk)
            return reverse('range:range-detail', kwargs={"issue": m.get_issue_str(), "slug": self.slug})
        if self.post_type == PostType.SRC:
            return reverse('src:detail', kwargs={"slug": self.slug})
        if self.post_type == PostType.FIELD_NOTE:
            return reverse('fieldnote:detail', kwargs={"year": self.pub_date.year, "month": self.pub_date.strftime("%m"), "slug": self.slug})
        if self.post_type == PostType.JRNL:
            return reverse('jrnl:detail', kwargs={"year": self.pub_date.year, "month": self.pub_date.strftime("%m"), "slug": self.slug})

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

    def get_featured_image_thumb(self):
        return self.featured_image.get_image_url_by_size("thumbnail")

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

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

    @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,post_type=self.post_type)

    @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 ''

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

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

    @property
    def sitemap_priority(self):
        if self.post_type in [2,4,5]:
            return 1.0
        else:
            return 0.7

    def get_image_url(self):
        '''
        for legacy jrnl posts without a featured_image
        '''
        try:
            image_dir, img = self.old_image.url.split('post-images/')[1].split('/')
            return '%spost-images/%s/%s' % (settings.IMAGES_URL, image_dir, img)
        except ValueError:
            pass

    def save(self, *args, **kwargs):
        created = self.pk is None
        if not created:
            md = render_images(self.body_markdown)
            prods = render_products(md)
            print(self.title)
            self.body_html = markdown_to_html(prods)
            if self.epilogue_markdown:
                self.epilogue_html = markdown_to_html(self.epilogue_markdown)
            if self.prologue_markdown:
                self.prologue_html = markdown_to_html(self.prologue_markdown)
            self.has_video = parse_video(self.body_html)
        if self.point:
            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:
            if self.post_type == PostType.FIELD_NOTE:
                self.featured_image = extract_main_image(self.body_markdown)
            else:
                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
            if self.featured_image:
                s = LuxImageSize.objects.get(name="featured_jrnl")
                ss = LuxImageSize.objects.get(name="picwide-sm")
                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(Post, self).save(*args, **kwargs)


class PostModerator(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(Post, PostModerator)

@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=Post)
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, pub_date=instance.pub_date, title=instance.title, slug=instance.slug, post_type=instance.get_post_type_display())
    post_save.disconnect(post_save_events, sender=Post)
    instance.save()
    post_save.connect(post_save_events, sender=Post)


class PostSitemap(Sitemap):
    changefreq = "never"
    protocol = "https"

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

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

    def priority(self, obj):
        return obj.sitemap_priority