--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gpp/potd/models.py	Mon Apr 06 02:43:12 2009 +0000
@@ -0,0 +1,136 @@
+"""
+Models for the Photo Of The Day (POTD) application.
+"""
+import os
+from PIL import ImageFile
+from PIL import Image
+try:
+   from cStringIO import StringIO
+except:
+   from StringIO import StringIO
+
+from django.db import models
+from django.contrib.auth.models import User
+from django.core.files.base import ContentFile
+
+POTD_THUMB_WIDTH = 120
+
+def scale_image(image):
+    (w, h) = image.size
+    if w <= POTD_THUMB_WIDTH:
+        return image
+    scale_factor = float(POTD_THUMB_WIDTH) / w
+    new_height = int(scale_factor * h)
+    return image.resize((POTD_THUMB_WIDTH, new_height), Image.ANTIALIAS)
+
+
+class Photo(models.Model):
+    """Model to represent a POTD"""
+    photo = models.ImageField(upload_to='potd/%Y/%m/%d')
+    thumb = models.ImageField(upload_to='potd/%Y/%m/%d/thumbs', blank=True, null=True)
+    caption = models.CharField(max_length=128)
+    description = models.TextField()
+    user = models.ForeignKey(User)
+    date_added = models.DateField(auto_now_add=True)
+    potd_count = models.IntegerField(default=0)
+
+    def __unicode__(self):
+        return u'%s (%s)' % (self.caption, self.pk)
+
+    class Meta:
+        ordering = ('-date_added', '-caption')
+
+    def save(self, force_insert=False, force_update=False):
+
+        if self.thumb:
+            self.thumb.delete(save=False)
+
+        parser = ImageFile.Parser()
+        for chunk in self.photo.chunks():
+            parser.feed(chunk)
+        image = parser.close()
+        format = image.format
+        image = scale_image(image)
+        s = StringIO()
+        image.save(s, format)
+        thumb_name = os.path.basename(self.photo.path)
+        self.thumb.save(thumb_name, ContentFile(s.getvalue()), save=False)
+        
+        super(Photo, self).save(force_insert, force_update)
+        Sequence.objects.insert_photo(self.pk)
+
+    def delete(self):
+        Sequence.objects.remove_photo(self.pk)
+        super(Photo, self).delete()
+
+    def can_comment_on(self):
+        return Current.objects.get_current_id() == self.id
+
+
+class CurrentManager(models.Manager):
+    def get_current_photo(self):
+        try:
+            c = self.get(pk=1)
+            return c.potd
+        except Current.DoesNotExist:
+            return None
+
+    def get_current_id(self):
+        potd = self.get_current_photo()
+        if potd is not None:
+            return potd.pk
+        return None
+
+
+class Current(models.Model):
+    """This model simply stores the current POTD."""
+    potd = models.ForeignKey(Photo)
+
+    objects = CurrentManager()
+
+    def __unicode__(self):
+        return self.potd.__unicode__()
+
+    class Meta:
+        verbose_name_plural = 'Current'
+
+
+class SequenceManager(models.Manager):
+    def insert_photo(self, photo_id):
+        current = Current.objects.get_current_id()
+        if current is not None:
+            try:
+                s = self.get(pk=1)
+                seq = [int(x) for x in s.seq.split(',')]
+                if photo_id not in seq:
+                    i = seq.index(current)
+                    seq.insert(i + 1, photo_id)
+                    s.seq = ','.join([str(x) for x in seq])
+                    s.save()
+            except:
+                pass
+
+    def remove_photo(self, photo_id):
+        try:
+            s = self.get(pk=1)
+            seq = [int(x) for x in s.seq.split(',')]
+            if photo_id in seq:
+                seq.remove(photo_id)
+                s.seq = ','.join([str(x) for x in seq])
+                s.save()
+        except:
+            pass
+
+
+class Sequence(models.Model):
+    """This model stores the sequence of photos for the POTD."""
+    seq = models.CommaSeparatedIntegerField(max_length=4096)
+
+    objects = SequenceManager()
+
+    def __unicode__(self):
+        return self.seq
+
+    class Meta:
+        verbose_name_plural = 'Sequence'
+