use newest librarian

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

diff --git a/apps/sponsors/models.py b/apps/sponsors/models.py
index ffad8e7..2d18d16 100644 (file)
--- a/apps/sponsors/models.py
+++ b/apps/sponsors/models.py
@@ -1,13 +1,28 @@
+# -*- 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 json
+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 jsonfield 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')
-    url = models.URLField(_('url'), blank=True, verify_exists=False)
-    
+    logo = models.ImageField(_('logo'), upload_to='sponsorzy/sponsor/logo')
+    url = models.URLField(_('url'), blank=True)
+
     def __unicode__(self):
         return self.name
 
@@ -18,18 +33,69 @@ 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.sponsors:
+            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.sponsors:
+            sponsor_ids.extend(column['sponsors'])
+        sponsors = Sponsor.objects.in_bulk(sponsor_ids)
+        sprite = Image.new('RGBA', (THUMB_WIDTH, len(sponsors) * THUMB_HEIGHT))
+        for i, sponsor_id in enumerate(sponsor_ids):
+            simg = Image.open(sponsors[sponsor_id].logo.path)
+            if simg.size[0] > THUMB_WIDTH or simg.size[1] > THUMB_HEIGHT:
+                size = (
+                    min(THUMB_WIDTH, 
+                        simg.size[0] * THUMB_HEIGHT / simg.size[1]),
+                    min(THUMB_HEIGHT,
+                        simg.size[1] * THUMB_WIDTH / simg.size[0])
+                )
+                simg = simg.resize(size, Image.ANTIALIAS)
+            sprite.paste(simg, (
+                    (THUMB_WIDTH - simg.size[0]) / 2,
+                    i * THUMB_HEIGHT + (THUMB_HEIGHT - simg.size[1]) / 2,
+                    ))
+        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):
+        if isinstance(self.sponsors, basestring):
+            # Walkaround for weird jsonfield 'no-decode' optimization.
+            self.sponsors = json.loads(self.sponsors)
+        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