import requests
import datetime
from random import randint
from django.template.defaultfilters import striptags
from django.urls import reverse
from django.utils.html import format_html, format_html_join
from django.apps import apps
from django.db import models
from django.utils import timezone
from django.core.mail import EmailMessage
from django.core.mail import send_mail
from django.contrib.sitemaps import Sitemap
from django.db.models.signals import post_save
from django.dispatch import receiver

from taggit.managers import TaggableManager
from utils.util import markdown_to_html


def random_link():
    """
    Emails me a random link everyday (via cron)
    """
    total = Link.objects.all().count()
    pk = randint(1, total)
    try:
        link = Link.objects.get(pk=pk)
    except Link.DoesNotExist:
        try:
            link = Link.objects.get(pk=pk+1)
        except Link.DoesNotExist:
            link = Link.objects.get(pk=pk+91)
    subject = "today's link: %s" % link.title
    body = "%s\n\n%s\n\n\nvisit site:%s\n\n\ndelete link: https://live.luxagraf.net/admin/links/link/%s/" % (link.title, link.description, link.url, link.pk)
    msg = EmailMessage(subject, striptags(body), 'sng@luxagraf.net', ['sng@luxagraf.net'])
    msg.send()


def get_source(source):
    url = "http://heckyesmarkdown.com/go/?read=1&preview=0&showframe=0&output=json&u=%s" % (source)
    r = requests.get(url, timeout=15.001)
    data = r.json()
    return data


def email_link(link):
    """
    Emails me a copy of link
    """
    subject = link.title
    body = "%s\n\n%s\n\n\nvisit site:%s\n" % (link.title, link.description, link.url)
    send_mail(
        subject,
        body,    
        'sng@luxagraf.net',
        ['sng@luxagraf.net']
    )


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


class Link(models.Model):
    title = models.CharField(max_length=400)
    url = models.CharField(max_length=400)
    description = models.TextField(blank=True, null=True)
    body_markdown = models.TextField(blank=True, null=True)
    pub_date = models.DateTimeField(default=timezone.now)
    PUB_STATUS = (
        (0, 'Private'),
        (1, 'Public'),
    )
    status = models.IntegerField(choices=PUB_STATUS, default=0)
    tags = TaggableManager(blank=True)
    image = models.FileField(blank=True, null=True, upload_to=get_upload_path)

    class Meta:
        ordering = ['-pub_date']

    def __str__(self):
        return self.title

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

    def render_description(self):
        return markdown_to_html(self.description)

    def admin_link(self):
        return format_html('<a href="%s">Visit Site</a>' % (self.url))
        admin_link.short_description = 'Link'

    def admin_tags(self):
        return format_html_join(
                    '\n', "<a href='/admin/links/link?tag={}'>{}</a>,",
                        ((tag.slug, tag.name) for tag in self.tags.all())
                        )
        admin_tags.short_description = 'Tags'

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

    @property
    def get_next_published(self):
        return self.get_next_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_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 ''


@receiver(post_save, sender=Link)
def post_save_events(sender, update_fields, created, instance, **kwargs):
    if instance.body_markdown:
        pass
    else:
        md = get_source(instance.url)
        instance.body_markdown = md['markdown']
        post_save.disconnect(post_save_events, sender=Link)
        instance.save()
        post_save.connect(post_save_events, sender=Link)
        email_link(instance)


class LinkSitemap(Sitemap):
    changefreq = "never"
    priority = 0.4

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

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