Switch to Spotify GraphQL API to match Jellyfin plugin approach

- Replace REST API calls with GraphQL API (api-partner.spotify.com/pathfinder/v1/query)
- Use same persisted query approach as Jellyfin Spotify Import plugin
- GraphQL API is more reliable and has better rate limits
- Fetch playlists with operationName: fetchPlaylist
- Parse GraphQL response structure (playlistV2, itemV2, etc)
- This should eliminate TooManyRequests errors

allstarr/Services/Spotify/SpotifyApiClient.cs

@@ -283,8 +283,8 @@ public class SpotifyApiClient : IDisposable
     }
     
     /// <summary>
-    /// Fetches a playlist with all its tracks from Spotify.
-    /// Uses the web API to access editorial playlists that aren't available via the official API.
+    /// Fetches a playlist with all its tracks from Spotify using the GraphQL API.
+    /// This matches the approach used by the Jellyfin Spotify Import plugin.
     /// </summary>
     /// <param name="playlistId">Spotify playlist ID or URI</param>
     /// <param name="cancellationToken">Cancellation token</param>
@@ -303,17 +303,8 @@ public class SpotifyApiClient : IDisposable
         
         try
         {
-            // Use the official API with the web token for playlist data
-            var playlist = await FetchPlaylistMetadataAsync(playlistId, token, cancellationToken);
-            if (playlist == null) return null;
-            
-            // Fetch all tracks with pagination
-            var tracks = await FetchAllPlaylistTracksAsync(playlistId, token, cancellationToken);
-            playlist.Tracks = tracks;
-            playlist.TotalTracks = tracks.Count;
-            
-            _logger.LogInformation("Fetched playlist '{Name}' with {Count} tracks", playlist.Name, tracks.Count);
-            return playlist;
+            // Use GraphQL API (same as Jellyfin plugin) - more reliable and less rate-limited
+            return await FetchPlaylistViaGraphQLAsync(playlistId, token, cancellationToken);
         }
         catch (Exception ex)
         {
@@ -322,6 +313,217 @@ public class SpotifyApiClient : IDisposable
         }
     }
     
+    /// <summary>
+    /// Fetch playlist using Spotify's GraphQL API (api-partner.spotify.com/pathfinder/v1/query)
+    /// This is the same approach used by the Jellyfin Spotify Import plugin
+    /// </summary>
+    private async Task<SpotifyPlaylist?> FetchPlaylistViaGraphQLAsync(
+        string playlistId,
+        string token,
+        CancellationToken cancellationToken)
+    {
+        const int pageLimit = 50;
+        var offset = 0;
+        var totalTrackCount = pageLimit;
+        var tracks = new List<SpotifyPlaylistTrack>();
+        
+        SpotifyPlaylist? playlist = null;
+        
+        while (tracks.Count < totalTrackCount && offset < totalTrackCount)
+        {
+            if (cancellationToken.IsCancellationRequested) break;
+            
+            // Build GraphQL query URL (same as Jellyfin plugin)
+            var queryParams = new Dictionary<string, string>
+            {
+                { "operationName", "fetchPlaylist" },
+                { "variables", $"{{\"uri\":\"spotify:playlist:{playlistId}\",\"offset\":{offset},\"limit\":{pageLimit}}}" },
+                { "extensions", "{\"persistedQuery\":{\"version\":1,\"sha256Hash\":\"19ff1327c29e99c208c86d7a9d8f1929cfdf3d3202a0ff4253c821f1901aa94d\"}}" }
+            };
+            
+            var queryString = string.Join("&", queryParams.Select(kv => $"{Uri.EscapeDataString(kv.Key)}={Uri.EscapeDataString(kv.Value)}"));
+            var url = $"{WebApiBase}/query?{queryString}";
+            
+            var request = new HttpRequestMessage(HttpMethod.Get, url);
+            request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token);
+            
+            var response = await _webApiClient.SendAsync(request, cancellationToken);
+            
+            if (!response.IsSuccessStatusCode)
+            {
+                _logger.LogError("Failed to fetch playlist via GraphQL: {StatusCode}", response.StatusCode);
+                return null;
+            }
+            
+            var json = await response.Content.ReadAsStringAsync(cancellationToken);
+            using var doc = JsonDocument.Parse(json);
+            
+            if (!doc.RootElement.TryGetProperty("data", out var data) ||
+                !data.TryGetProperty("playlistV2", out var playlistV2))
+            {
+                _logger.LogError("Invalid GraphQL response structure");
+                return null;
+            }
+            
+            // Parse playlist metadata on first iteration
+            if (playlist == null)
+            {
+                playlist = ParseGraphQLPlaylist(playlistV2, playlistId);
+                if (playlist == null) return null;
+            }
+            
+            // Parse tracks from this page
+            if (playlistV2.TryGetProperty("content", out var content))
+            {
+                if (content.TryGetProperty("totalCount", out var totalCount))
+                {
+                    totalTrackCount = totalCount.GetInt32();
+                }
+                
+                if (content.TryGetProperty("items", out var items))
+                {
+                    foreach (var item in items.EnumerateArray())
+                    {
+                        var track = ParseGraphQLTrack(item, offset + tracks.Count);
+                        if (track != null)
+                        {
+                            tracks.Add(track);
+                        }
+                    }
+                }
+            }
+            
+            offset += pageLimit;
+        }
+        
+        if (playlist != null)
+        {
+            playlist.Tracks = tracks;
+            playlist.TotalTracks = tracks.Count;
+            _logger.LogInformation("Fetched playlist '{Name}' with {Count} tracks via GraphQL", playlist.Name, tracks.Count);
+        }
+        
+        return playlist;
+    }
+    
+    private SpotifyPlaylist? ParseGraphQLPlaylist(JsonElement playlistV2, string playlistId)
+    {
+        try
+        {
+            var name = playlistV2.TryGetProperty("name", out var n) ? n.GetString() : "Unknown Playlist";
+            var description = playlistV2.TryGetProperty("description", out var d) ? d.GetString() : null;
+            
+            string? ownerName = null;
+            if (playlistV2.TryGetProperty("ownerV2", out var owner) &&
+                owner.TryGetProperty("data", out var ownerData) &&
+                ownerData.TryGetProperty("name", out var ownerNameProp))
+            {
+                ownerName = ownerNameProp.GetString();
+            }
+            
+            return new SpotifyPlaylist
+            {
+                SpotifyId = playlistId,
+                Name = name ?? "Unknown Playlist",
+                Description = description,
+                OwnerName = ownerName,
+                FetchedAt = DateTime.UtcNow,
+                Tracks = new List<SpotifyPlaylistTrack>()
+            };
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Failed to parse GraphQL playlist metadata");
+            return null;
+        }
+    }
+    
+    private SpotifyPlaylistTrack? ParseGraphQLTrack(JsonElement item, int position)
+    {
+        try
+        {
+            if (!item.TryGetProperty("itemV2", out var itemV2) ||
+                !itemV2.TryGetProperty("data", out var data))
+            {
+                return null;
+            }
+            
+            var trackId = data.TryGetProperty("uri", out var uri) ? uri.GetString()?.Replace("spotify:track:", "") : null;
+            var name = data.TryGetProperty("name", out var n) ? n.GetString() : null;
+            
+            if (string.IsNullOrEmpty(trackId) || string.IsNullOrEmpty(name))
+            {
+                return null;
+            }
+            
+            // Parse artists
+            var artists = new List<string>();
+            if (data.TryGetProperty("artists", out var artistsObj) &&
+                artistsObj.TryGetProperty("items", out var artistItems))
+            {
+                foreach (var artist in artistItems.EnumerateArray())
+                {
+                    if (artist.TryGetProperty("profile", out var profile) &&
+                        profile.TryGetProperty("name", out var artistName))
+                    {
+                        var artistNameStr = artistName.GetString();
+                        if (!string.IsNullOrEmpty(artistNameStr))
+                        {
+                            artists.Add(artistNameStr);
+                        }
+                    }
+                }
+            }
+            
+            // Parse album
+            string? albumName = null;
+            if (data.TryGetProperty("albumOfTrack", out var album) &&
+                album.TryGetProperty("name", out var albumNameProp))
+            {
+                albumName = albumNameProp.GetString();
+            }
+            
+            // Parse duration
+            int durationMs = 0;
+            if (data.TryGetProperty("trackDuration", out var duration) &&
+                duration.TryGetProperty("totalMilliseconds", out var durationMsProp))
+            {
+                durationMs = durationMsProp.GetInt32();
+            }
+            
+            // Parse album art
+            string? albumArtUrl = null;
+            if (data.TryGetProperty("albumOfTrack", out var albumOfTrack) &&
+                albumOfTrack.TryGetProperty("coverArt", out var coverArt) &&
+                coverArt.TryGetProperty("sources", out var sources) &&
+                sources.GetArrayLength() > 0)
+            {
+                var firstSource = sources[0];
+                if (firstSource.TryGetProperty("url", out var urlProp))
+                {
+                    albumArtUrl = urlProp.GetString();
+                }
+            }
+            
+            return new SpotifyPlaylistTrack
+            {
+                SpotifyId = trackId,
+                Title = name,
+                Artists = artists,
+                Album = albumName ?? string.Empty,
+                DurationMs = durationMs,
+                Position = position,
+                AlbumArtUrl = albumArtUrl,
+                Isrc = null // GraphQL doesn't return ISRC, we'll fetch it separately if needed
+            };
+        }
+        catch (Exception ex)
+        {
+            _logger.LogWarning(ex, "Failed to parse GraphQL track");
+            return null;
+        }
+    }
+    
     private async Task<SpotifyPlaylist?> FetchPlaylistMetadataAsync(
         string playlistId, 
         string token,