+
+
+class ThumbnailTemplate(models.Model):
+    youtube = models.ForeignKey(YouTube, models.CASCADE)
+    order = models.SmallIntegerField()
+    is_active = models.BooleanField()
+    background = models.FileField(upload_to='youtube/thumbnail')
+    definition = models.TextField()
+    authors = models.CharField(max_length=255, blank=True)
+    epochs = models.CharField(max_length=255, blank=True)
+    kinds = models.CharField(max_length=255, blank=True)
+    genres = models.CharField(max_length=255, blank=True)
+    collections = models.CharField(max_length=255, blank=True)
+
+    class Meta:
+        ordering = ('order', )
+
+    def generate(self, audiobook):
+        try:
+            title = audiobook.book['title']
+            if audiobook.book.get('parent'):
+                parent_title = audiobook.book['parent']['title']
+                if not title.startswith(parent_title):
+                    title = ", ".join((parent_title, title))
+
+            img = create_thumbnail(
+                self.background.path,
+                self.definition,
+                {
+                    "author": ', '.join((a['name'] for a in audiobook.book['authors'])),
+                    "title": title,
+                    "part": (audiobook.youtube_volume or audiobook.part_name).strip() if audiobook.youtube_volume_count > 1 else '',
+                },
+                lambda name: Font.objects.get(name=name).truetype.path
+            )
+        except Exception as e:
+            print(e)
+            return
+        else:
+            buf = io.BytesIO()
+            img.save(buf, format='PNG')
+            return buf
+
+    def is_for_audiobook(self, audiobook):
+        for category in 'authors', 'epochs', 'kinds', 'genres':
+            if getattr(self, category):
+                book_slugs = set([g['slug'] for g in audiobook.book[category]])
+                template_slugs = set([g.strip() for g in getattr(self, category).split(',')])
+                if not book_slugs.intersection(template_slugs):
+                    return False
+
+        if self.collections:
+            template_collections = set([g.strip() for g in self.collections.split(',')])
+            in_any = False
+            for collection in template_collections:
+                apidata = requests.get(
+                    f'https://wolnelektury.pl/api/collections/{collection}/'
+                ).json()
+                for book in apidata['books']:
+                    if book['slug'] == audiobook.slug:
+                        in_any = True
+                        break
+                if in_any:
+                    break
+            if not in_any:
+                return False
+        
+        return True