add jellyfin season number fallback (#1497)

CHANGELOG.md

@@ -49,6 +49,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Test QSV acceleration if configured, and fallback to software mode if test fails
 - Detect QSV capabilities on Linux (supported decoders, encoders)
 - Use hardware acceleration for error messages/offline messages
+- Try to parse season number from season folder when Jellyfin does not provide season number
+  - This *may* fix issues where Jellyfin libraries show all season numbers as 0 (specials)
 
 ## [0.8.2-beta] - 2023-09-14
 ### Added

ErsatzTV.Infrastructure/Jellyfin/JellyfinApiClient.cs

@@ -2,6 +2,7 @@
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Interfaces.Jellyfin;
+using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Jellyfin;
 using ErsatzTV.Core.Metadata;
 using ErsatzTV.Infrastructure.Jellyfin.Models;
@@ -14,16 +15,19 @@ namespace ErsatzTV.Infrastructure.Jellyfin;
 public class JellyfinApiClient : IJellyfinApiClient
 {
     private readonly IJellyfinPathReplacementService _jellyfinPathReplacementService;
+    private readonly IFallbackMetadataProvider _fallbackMetadataProvider;
     private readonly ILogger<JellyfinApiClient> _logger;
     private readonly IMemoryCache _memoryCache;
 
     public JellyfinApiClient(
         IMemoryCache memoryCache,
         IJellyfinPathReplacementService jellyfinPathReplacementService,
+        IFallbackMetadataProvider fallbackMetadataProvider,
         ILogger<JellyfinApiClient> logger)
     {
         _memoryCache = memoryCache;
         _jellyfinPathReplacementService = jellyfinPathReplacementService;
+        _fallbackMetadataProvider = fallbackMetadataProvider;
         _logger = logger;
     }
 
@@ -721,6 +725,16 @@ public class JellyfinApiClient : IJellyfinApiClient
             {
                 season.SeasonNumber = item.IndexNumber.Value;
             }
+            else
+            {
+                Option<int> maybeSeasonNumber =
+                    _fallbackMetadataProvider.GetSeasonNumberForFolder(item.Path ?? string.Empty);
+
+                foreach (int seasonNumber in maybeSeasonNumber)
+                {
+                    season.SeasonNumber = seasonNumber;
+                }
+            }
 
             return season;
         }