import requests
import json
from django.template.defaultfilters import striptags
from django.core.urlresolvers import reverse
from django.utils.encoding import force_text
from django.db import models
from django.core.mail import EmailMessage
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.widgets import markdown_to_html


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):
    """
    Sends an imported link to Gmail (never hurts to have backups)
    """
    subject = link.title
    body = "%s\n\n%s\n\n\nvisit site:%s\n" % (link.title, link.description, link.url)
    msg = EmailMessage(subject, striptags(body), 'sng@luxagraf.net', ['luxagraf+links@gmail.com'])
    msg.send()
    msg = EmailMessage(subject, striptags(body), 'sng@luxagraf.net', ['sng+links@luxagraf.net'])
    msg.send()


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()
    PUB_STATUS = (
        (0, 'Private'),
        (1, 'Public'),
    )
    status = models.IntegerField(choices=PUB_STATUS, default=0)
    tags = TaggableManager(blank=True)

    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 get_previous_published(self):
        return self.get_previous_by_pub_date(status__exact=1)

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

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

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