import datetime
from django.contrib.gis.db import models
from django.conf import settings
from django.contrib.syndication.feeds import Feed
from django.contrib.sitemaps import Sitemap
from django.template.defaultfilters import truncatewords_html
from PIL import Image

from utils import markdown2 as markdown

from photos.models import PhotoGallery
from locations.models import Location,Region
#from locations.signals import create_location_item
from blog.signals import update_recent

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

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

def image_url_replace(str):
    str = str.replace('[[base_url]]', settings.IMAGES_URL)
    return str

def markdown_processor(md):    
    processed = markdown.markdown(md, ['footnotes'],safe_mode = False).split('<break>')
    html = processed[0]+processed[1]
    lede = processed[0]
    return html, lede

PUB_STATUS = (
        (0, 'Draft'),
        (1, 'Published'),
    )

TEMPLATES = (
        (0, 'single'),
        (1, 'double'),
        (2, 'single-dark'),
        (3, 'double-dark'),
    )
class PostImage(models.Model):
    title = models.CharField(max_length=100)
    image = models.ImageField(upload_to="%s%s" %(settings.IMAGES_ROOT, datetime.datetime.today().strftime("%Y")))

    def __unicode__(self):
        return self.title
    
    def output_tags(self):
	    return force_unicode('<img src="%s%s" alt="%s" class="postpic"/>' % \
                (settings.IMAGES_URL, self.image.url.split('images')[1].split('/',1)[1], self.title))


class Topic(models.Model):
    name = models.CharField(max_length=100)
    slug = models.SlugField()

    def __unicode__(self):
        return self.name
    
    def get_absolute_url(self):
       return "/topics/%s/" % (self.slug)
                
class Entry(models.Model):
    title = models.CharField(max_length=200)
    slug = models.SlugField(unique_for_date='pub_date')
    lede = models.TextField(blank=True)
    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=True)
    point = models.PointField(null=True)
    location = models.ForeignKey(Location, null=True)
    region = models.ForeignKey(Region, null=True)
    status = models.IntegerField(choices=PUB_STATUS, default=0)
    photo_gallery = models.ForeignKey(PhotoGallery, blank=True, null=True, verbose_name='photo set')
    image = models.FileField(upload_to=get_upload_path, null=True,blank=True)
    image_height = models.CharField(max_length=20, null=True,blank=True)
    image_width = models.CharField(max_length=20, null=True,blank=True)
    thumbnail = models.FileField(upload_to=get_tn_path, null=True,blank=True)
    thumb_height = models.CharField(max_length=20, null=True,blank=True)
    thumb_width = models.CharField(max_length=20, null=True,blank=True)
    meta_description = models.CharField(max_length=256, null=True, blank=True)
    topics = models.ManyToManyField(Topic, blank=True)
    template_name = models.IntegerField(choices=TEMPLATES, default=0)
    
    @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 
    
    class Meta:
        ordering = ('-pub_date',)
        get_latest_by = 'pub_date'
        verbose_name_plural = 'entries'

    def __unicode__(self):
        return self.title

    def get_absolute_url(self):
        return "/%s/%s/" % (self.pub_date.strftime("%Y/%b/%d").lower(), self.slug)
    
    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 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.thumbnail.url.split('post-thumbnail/')[1].split('/')
        return '%spost-thumbnail/%s/%s' %(settings.IMAGES_URL, image_dir, img)
    
    def get_image_url(self):
        image_dir, img = self.image.url.split('post-images/')[1].split('/')
        return '%spost-images/%s/%s' %(settings.IMAGES_URL, image_dir, img)
            
    def save(self): 
        #get image dimensions
        img = Image.open(self.image)
        self.image_width, self.image_height = img.size 
        #same for thumb
        img = Image.open(self.thumbnail)
        self.thumb_width, self.thumb_height = img.size 
        #find and replace image urls
        md = image_url_replace(self.body_markdown)
        #run markdown
        html,lede = markdown_processor(md)
        self.body_html = html
        self.lede = lede
        self.dek == markdown.markdown(self.dek, safe_mode = False)
        super(Entry, self).save()

class BlogSitemap(Sitemap):
    changefreq = "never"
    priority = 1.0

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

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

class LatestFull(Feed):
    title = "Luxagraf: Topographical Writings"
    link = "/writing/"
    description = "Latest postings to luxagraf.net"
    description_template = 'feeds/blog_description.html'

    def items(self):
        return Entry.objects.filter(status__exact=1).order_by('-pub_date')[:10]


from django.dispatch import dispatcher
from django.db.models import signals

signals.post_save.connect(update_recent, sender=Entry)