Cross reference local playlists with beatleader playlists

Setlist/Plugin.cs

@@ -1,4 +1,6 @@
 using System;
+using System.Collections.Generic;
+using System.Linq;
 using IPA;
 using IPALogger = IPA.Logging.Logger;
 
@@ -45,15 +47,36 @@ namespace Setlist
                     return;
                 }
 
+                var entries = new List<(string Title, bool HasSyncUrl, string BeatLeaderGuid)>();
                 foreach (var playlist in playlists)
                 {
                     var hasSyncUrl = false;
+                    string syncUrl = null;
                     if (playlist.TryGetCustomData("syncURL", out var syncObj) && syncObj is string url)
                     {
+                        syncUrl = url;
                         hasSyncUrl = !string.IsNullOrWhiteSpace(url);
                     }
 
-                    Log.Info($"Playlist \"{playlist.Title}\": hasSyncUrl={hasSyncUrl}");
+                    string blGuid = null;
+                    if (hasSyncUrl && BeatLeaderPlaylistOwnership.TryExtractBeatLeaderPlaylistGuid(syncUrl, out var g))
+                    {
+                        blGuid = g;
+                    }
+
+                    entries.Add((playlist.Title, hasSyncUrl, blGuid));
+                }
+
+                if (entries.Any(e => e.BeatLeaderGuid != null))
+                {
+                    BeatLeaderPlaylistOwnership.ScheduleVerifyAndLog(entries, Log);
+                }
+                else
+                {
+                    foreach (var e in entries)
+                    {
+                        Log.Info(FormatPlaylistLogLine(e.Title, e.HasSyncUrl, e.BeatLeaderGuid, ownedGuids: null));
+                    }
                 }
             }
             catch (Exception ex)
@@ -66,5 +89,36 @@ namespace Setlist
         public void OnApplicationQuit()
         {
         }
+
+        internal static string FormatPlaylistLogLine(
+            string title,
+            bool hasSyncUrl,
+            string beatLeaderGuid,
+            HashSet<string> ownedGuids)
+        {
+            string ownerPart;
+            if (!hasSyncUrl)
+            {
+                ownerPart = "beatLeaderOwnerConfirmed=n/a (no sync URL)";
+            }
+            else if (string.IsNullOrEmpty(beatLeaderGuid))
+            {
+                ownerPart = "beatLeaderOwnerConfirmed=n/a (sync URL is not a BeatLeader playlist)";
+            }
+            else if (ownedGuids == null)
+            {
+                ownerPart = "beatLeaderOwnerConfirmed=unknown (BeatLeader /user/playlists did not succeed; see prior log line)";
+            }
+            else if (ownedGuids.Contains(beatLeaderGuid))
+            {
+                ownerPart = "beatLeaderOwnerConfirmed=true";
+            }
+            else
+            {
+                ownerPart = "beatLeaderOwnerConfirmed=false";
+            }
+
+            return $"Playlist \"{title}\": hasSyncUrl={hasSyncUrl}, {ownerPart}";
+        }
     }
 }