class Picture(models.Model):
    description = models.TextField()
    big_picture = ExtendedImageField(upload_to="big_picture/%Y/%m/%d/", max_length=100, width=settings.BIG_PICTURE_WIDTH, height=settings.BIG_PICTURE_HEIGHT)
    middle_picture = models.ImageField(upload_to="middle_picture/%Y/%m/%d", blank=True, editable=False, max_length=100)
    small_picture = models.ImageField(upload_to="small_picture/%Y/%m/%d", blank=True, editable=False, max_length=100)

    def save_picture(self, image, directory, path):
        date = datetime.date.today()
        name = os.path.basename(path)
        year = str(date.year)
        month = str(date.month).zfill(2)
        day = str(date.day).zfill(2)
        abs_path = os.path.join(settings.MEDIA_ROOT, directory, year, month, day)
        rel_path = os.path.join(directory, year, month, day)
        if not os.path.isdir(abs_path):
            os.makedirs(abs_path)
        image.save("%s/%s" % (abs_path, name))
        return "%s/%s" % (rel_path, name)
        

    def create_middle(self, path):
        image = Image.open(path)
        size = (200, 200)
        image.thumbnail(size, Image.ANTIALIAS)
        return self.save_picture(image, settings.MIDDLE_PICTURE, path)

    def create_small(self, path):
        image = Image.open(path)
        x,y = image.size
        min_size = min(x, y)
        region = image.crop((0, 0, min_size, min_size))
        size = (100, 100)
        region.thumbnail(size, Image.ANTIALIAS)
        return self.save_picture(region, settings.SMALL_PICTURE, path)


    def save(self):
        if self.big_picture:
            image_path = self.big_picture.path
            self.middle_picture = self.create_middle(image_path)
            self.small_picture = self.create_small(image_path)
        super(Picture, self).save()


    class Meta:
        verbose_name = "Picture"
        verbose_name_plural = "Pictures"

    def __unicode__(self):
        return self.description