Set oEmbed author to content when video is present

Discord won't show post content when a video is attached.
This essentially copies what FixTweet does to work around that.

app/helpers/statuses_helper.rb

@@ -18,7 +18,7 @@ module StatusesHelper
     end
   end
 
-  def media_summary(status)
+  def attachment_types(status)
     attachments = { image: 0, video: 0, audio: 0 }
 
     status.ordered_media_attachments.each do |media|
@@ -31,6 +31,12 @@ module StatusesHelper
       end
     end
 
+    attachments
+  end
+
+  def media_summary(status)
+    attachments = attachment_types(status)
+
     text = attachments.to_a.reject { |_, value| value.zero? }.map { |key, value| I18n.t("statuses.attached.#{key}", count: value) }.join(' · ')
 
     return if text.blank?

app/serializers/oembed_serializer.rb

@@ -2,6 +2,7 @@
 
 class OEmbedSerializer < ActiveModel::Serializer
   include RoutingHelper
+  include StatusesHelper
   include ActionView::Helpers::TagHelper
 
   attributes :type, :version, :author_name,
@@ -17,7 +18,7 @@ class OEmbedSerializer < ActiveModel::Serializer
   end
 
   def author_name
-    object.account.display_name.presence || object.account.username
+    (attachment_types(object)[:video]).positive? ? status_description(object) : (object.account.display_name.presence || object.account.username)
   end
 
   def author_url