import re
from django.contrib.gis.db import models
from django.utils import timezone
from django.conf import settings
from django import forms
from locations.models import Location
from django.urls import reverse

from utils.util import render_images, parse_image, markdown_to_html
from locations.models import CheckIn

def render_images(s):
    s = re.sub('<img(.*)/>', parse_image, s)
    return s

class Sketch(models.Model):
    title = models.CharField(max_length=250, blank=True)
    subtitle = models.CharField(max_length=250,blank=True)
    slug = models.SlugField(unique_for_date='pub_date', blank=True)
    pub_date = models.DateTimeField(default=timezone.now)
    body_html = models.TextField(blank=True)
    body_markdown = models.TextField('Note')
    point = models.PointField(blank=True, null=True)
    location = models.ForeignKey(Location, on_delete=models.CASCADE, blank=True, null=True)
    PUB_STATUS = (
        (0, 'Draft'),
        (1, 'Published'),
    )
    status = models.IntegerField(choices=PUB_STATUS, default=1)

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

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        return reverse("sketches:detail", kwargs={"year": self.pub_date.year, "month": self.pub_date.strftime("%m"), "slug": self.slug})

    @property
    def region(self):
        return self.location.state.country.lux_region

    @property
    def longitude(self):
        '''Get the site's longitude.'''
        return round(self.point.x, 2)

    @property
    def latitude(self):
        '''Get the site's latitude.'''
        return round(self.point.y, 2)

    @property
    def get_previous_published(self):
        return self.get_previous_by_pub_date()

    @property
    def get_next_published(self):
        return self.get_next_by_pub_date()

    @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 ''

    def save(self, *args, **kwargs):
        md = render_images(self.body_markdown)
        self.body_html = markdown_to_html(md)
        if not self.point:
            self.point = CheckIn.objects.latest().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 not self.id:
            self.pub_date= timezone.now()
        self.date_last_updated = timezone.now()
        super(Sketch, self).save()