fixes #540: load all sponsors at once

[wolnelektury.git] / apps / sponsors / models.py

diff --git a/apps/sponsors/models.py b/apps/sponsors/models.py
index ffad8e7..c7ecc6f 100644 (file)
--- a/apps/sponsors/models.py
+++ b/apps/sponsors/models.py
@@ -1,13 +1,34 @@
+# -*- coding: utf-8 -*-
+# This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
+# Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
+#
+import time
+from StringIO import StringIO
 from django.db import models
 from django.utils.translation import ugettext_lazy as _
+from django.template.loader import render_to_string
+from PIL import Image
 
+from sorl.thumbnail.fields import ImageWithThumbnailsField
+from sponsors.fields import JSONField
+from django.core.files.base import ContentFile
+
+THUMB_WIDTH=120
+THUMB_HEIGHT=120
 
 class Sponsor(models.Model):
     name = models.CharField(_('name'), max_length=120)
     _description = models.CharField(_('description'), blank=True, max_length=255)
-    logo = models.ImageField(_('logo'), upload_to='sponsors/sponsor/logo')
+    logo = ImageWithThumbnailsField(
+        _('logo'),
+        upload_to='sponsorzy/sponsor/logo',
+        thumbnail={
+            'size': (THUMB_WIDTH, THUMB_HEIGHT),
+            'extension': 'png',
+            'options': ['pad', 'detail'],
+        })
     url = models.URLField(_('url'), blank=True, verify_exists=False)
-    
+
     def __unicode__(self):
         return self.name
 
@@ -18,18 +39,55 @@ class Sponsor(models.Model):
             return self.name
 
 
-class SponsorGroup(models.Model):
+class SponsorPage(models.Model):
     name = models.CharField(_('name'), max_length=120)
-    order = models.IntegerField(_('order'), default=0)
-    column_width = models.PositiveIntegerField(_('column width'))
-    sponsor_ids = models.CommaSeparatedIntegerField(_('sponsors'), max_length=255)
-    
-    def sponsors(self):
-        ids = [int(pk) for pk in self.sponsor_ids.split(',')]
-        result = Sponsor.objects.in_bulk(ids)
-        return [result[pk] for pk in ids]
-    sponsors.changes_data = False
-    
+    sponsors = JSONField(_('sponsors'), default={})
+    _html = models.TextField(blank=True, editable=False)
+    sprite = models.ImageField(upload_to='sponsorzy/sprite', blank=True)
+
+    def populated_sponsors(self):
+        result = []
+        offset = 0
+        for column in self.get_sponsors_value():
+            result_group = {'name': column['name'], 'sponsors': []}
+            sponsor_objects = Sponsor.objects.in_bulk(column['sponsors'])
+            for sponsor_pk in column['sponsors']:
+                try:
+                    result_group['sponsors'].append((offset, sponsor_objects[sponsor_pk]))
+                    offset -= THUMB_HEIGHT
+                except KeyError:
+                    pass
+            result.append(result_group)
+        return result
+
+    def render_sprite(self):
+        sponsor_ids = []
+        for column in self.get_sponsors_value():
+            sponsor_ids.extend(column['sponsors'])
+        sponsors = Sponsor.objects.in_bulk(sponsor_ids)
+        sprite = Image.new('RGB', (THUMB_WIDTH, len(sponsors)*THUMB_HEIGHT))
+        for i, sponsor_id in enumerate(sponsor_ids):
+            simg = Image.open(sponsors[sponsor_id].logo.thumbnail.dest)
+            sprite.paste(simg, (0, i*THUMB_HEIGHT))
+        imgstr = StringIO()
+        sprite.save(imgstr, 'png')
+
+        if self.sprite:
+            self.sprite.delete(save=False)
+        self.sprite.save('sponsorzy/sprite/%s-%d.png' % (self.name, time.time()), ContentFile(imgstr.getvalue()), save=False)
+
+    def html(self):
+        return self._html
+    html = property(fget=html)
+
+    def save(self, *args, **kwargs):
+        self.render_sprite()
+        self._html = render_to_string('sponsors/page.html', {
+            'sponsors': self.populated_sponsors(),
+            'page': self
+        })
+        return super(SponsorPage, self).save(*args, **kwargs)
+
     def __unicode__(self):
         return self.name