From 55bd7feb6c6027b9035c9ad2abd6f9b9bb7628e3 Mon Sep 17 00:00:00 2001
From: Ray Cheung <github@pragmatic.hk>
Date: Sun, 1 Nov 2020 16:13:07 +0800
Subject: [PATCH] Work out the playlist continuation by video id (#1451)

Not the best but it tries to work out the continuation. However it
always picks the first match even if the same video appears multiple
times in the playlist.
---
 src/invidious/videos.cr | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/invidious/videos.cr b/src/invidious/videos.cr
index 8e314fe0..73f5d251 100644
--- a/src/invidious/videos.cr
+++ b/src/invidious/videos.cr
@@ -1020,7 +1020,9 @@ def process_continuation(db, query, plid, id)
     if index = query["index"]?.try &.to_i?
       continuation = index
     else
-      continuation = id
+      index = PG_DB.query_one?("SELECT index FROM playlist_videos WHERE plid = $1 AND id = $2 LIMIT 1", plid, id, as: Int64)
+      i = PG_DB.query_one?("SELECT array_position(index, $2) - 1 FROM playlists WHERE id = $1 LIMIT 1", plid, index, as: Int32)
+      continuation = i || id
     end
     continuation ||= 0
   end