MVP completed: Hook into Playlistmanager to post updates to beatleader maps owned by the user

Setlist/Plugin.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using BeatSaberPlaylistsLib.Types;
 using IPA;
+using PlaylistManager.Utilities;
 using IPALogger = IPA.Logging.Logger;
 
 namespace Setlist
@@ -16,6 +17,9 @@ namespace Setlist
         /// </summary>
         internal static IPALogger Log { get; private set; }
 
+        /// <summary>Set after the ownership scan resolves the platform user id; used when syncing after PlaylistManager adds a song.</summary>
+        internal static string CachedPlatformUserId { get; set; }
+
         [Init]
         public Plugin(IPALogger logger)
         {
@@ -28,6 +32,10 @@ namespace Setlist
         {
             try
             {
+                SetlistSyncHost.Ensure();
+
+                Events.playlistSongAdded += OnPlaylistSongAdded;
+
                 var playlists = BeatSaberPlaylistsLib.PlaylistManager.DefaultManager.GetAllPlaylists(
                     includeChildren: true,
                     out AggregateException loadErrors);
@@ -50,25 +58,11 @@ namespace Setlist
                 var entries = new List<(IPlaylist Playlist, string Title, bool HasSyncUrl, string BeatLeaderGuid, string OwnerId)>();
                 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);
-                    }
-
-                    string ownerId = null;
-                    if (playlist.TryGetCustomData("owner", out var ownerObj) && ownerObj is string o)
-                    {
-                        ownerId = string.IsNullOrWhiteSpace(o) ? null : o.Trim();
-                    }
-
-                    string blGuid = null;
-                    if (hasSyncUrl && BeatLeaderPlaylistOwnership.TryExtractBeatLeaderPlaylistGuid(syncUrl, out var g))
-                    {
-                        blGuid = g;
-                    }
+                    BeatLeaderPlaylistOwnership.TryReadBeatLeaderMetadata(
+                        playlist,
+                        out var hasSyncUrl,
+                        out var blGuid,
+                        out var ownerId);
 
                     entries.Add((playlist, playlist.Title, hasSyncUrl, blGuid, ownerId));
                 }
@@ -84,6 +78,12 @@ namespace Setlist
         [OnExit]
         public void OnApplicationQuit()
         {
+            Events.playlistSongAdded -= OnPlaylistSongAdded;
+        }
+
+        private void OnPlaylistSongAdded(IPlaylistSong song, IPlaylist playlist)
+        {
+            SetlistSyncHost.Instance?.StartPostOwnedBeatLeaderPlaylist(playlist, Log);
         }
 
         /// <summary>