From 8e3966fa8671bc7bc6ddf1924416493a8d3d7e8a Mon Sep 17 00:00:00 2001
From: syeopite <syeopite@syeopite.dev>
Date: Wed, 31 Jan 2024 22:12:14 -0800
Subject: [PATCH] Next videos: request next when response is empty

---
 src/invidious/videos/parser.cr | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/src/invidious/videos/parser.cr b/src/invidious/videos/parser.cr
index 77520dbe..f3fac96b 100644
--- a/src/invidious/videos/parser.cr
+++ b/src/invidious/videos/parser.cr
@@ -100,6 +100,29 @@ def extract_video_info(video_id : String, proxy_region : String? = nil)
   params = parse_video_info(video_id, player_response)
   params["reason"] = JSON::Any.new(reason) if reason
 
+  # Workaround for #4415
+  if params["relatedVideos"].as_a.empty?
+    continuation = player_response.dig?("contents", "twoColumnWatchNextResults", "secondaryResults",
+      "secondaryResults", "results", 0, "continuationItemRenderer",
+      "continuationEndpoint", "continuationCommand", "token")
+
+    if continuation
+      raw_related_videos = YoutubeAPI.next(continuation: continuation.as_s)
+      raw_related_videos = raw_related_videos.dig?("onResponseReceivedEndpoints", 0, "appendContinuationItemsAction", "continuationItems")
+
+      related = [] of JSON::Any
+
+      raw_related_videos.try &.as_a.each do |element|
+        if item = element["compactVideoRenderer"]?
+          related_video = parse_related_video(item)
+          related << JSON::Any.new(related_video) if related_video
+        end
+      end
+
+      params["relatedVideos"] = JSON::Any.new(related)
+    end
+  end
+
   new_player_response = nil
 
   if reason.nil?