New: Use TVDB's Episode ID as default uniqueid for Kodi metadata

Closes #4792

src/NzbDrone.Core/Datastore/Migration/167_add_tvdbid_to_episode.cs

@@ -0,0 +1,14 @@
+using FluentMigrator;
+using NzbDrone.Core.Datastore.Migration.Framework;
+
+namespace NzbDrone.Core.Datastore.Migration
+{
+    [Migration(167)]
+    public class add_tvdbid_to_episode : NzbDroneMigrationBase
+    {
+        protected override void MainDbUpgrade()
+        {
+            Alter.Table("Episodes").AddColumn("TvdbId").AsInt32().Nullable();
+        }
+    }
+}

src/NzbDrone.Core/Extras/Metadata/Consumers/Xbmc/XbmcMetadata.cs

@@ -271,10 +271,14 @@ namespace NzbDrone.Core.Extras.Metadata.Consumers.Xbmc
                         details.Add(new XElement("displayepisode", episode.AiredBeforeEpisodeNumber ?? -1));
                     }
                     
-                    var uniqueId = new XElement("uniqueid", episode.Id);
-                    uniqueId.SetAttributeValue("type", "sonarr");
-                    uniqueId.SetAttributeValue("default", true);
-                    details.Add(uniqueId);
+                    var tvdbId = new XElement("uniqueid", episode.TvdbId);
+                    tvdbId.SetAttributeValue("type", "tvdb");
+                    tvdbId.SetAttributeValue("default", true);
+                    details.Add(tvdbId);
+
+                    var sonarrId = new XElement("uniqueid", episode.Id);
+                    sonarrId.SetAttributeValue("type", "sonarr");
+                    details.Add(sonarrId);
 
                     if (image == null)
                     {

src/NzbDrone.Core/MetadataSource/SkyHook/Resource/EpisodeResource.cs

@@ -4,6 +4,7 @@ namespace NzbDrone.Core.MetadataSource.SkyHook.Resource
 {
     public class EpisodeResource
     {
+        public int TvdbId { get; set; }
         public int SeasonNumber { get; set; }
         public int EpisodeNumber { get; set; }
         public int? AbsoluteEpisodeNumber { get; set; }

src/NzbDrone.Core/MetadataSource/SkyHook/SkyHookProxy.cs

@@ -223,6 +223,7 @@ namespace NzbDrone.Core.MetadataSource.SkyHook
         private static Episode MapEpisode(EpisodeResource oracleEpisode)
         {
             var episode = new Episode();
+            episode.TvdbId = oracleEpisode.TvdbId;
             episode.Overview = oracleEpisode.Overview;
             episode.SeasonNumber = oracleEpisode.SeasonNumber;
             episode.EpisodeNumber = oracleEpisode.EpisodeNumber;

src/NzbDrone.Core/Tv/Episode.cs

@@ -17,6 +17,7 @@ namespace NzbDrone.Core.Tv
         public const string AIR_DATE_FORMAT = "yyyy-MM-dd";
 
         public int SeriesId { get; set; }
+        public int TvdbId { get; set; }
         public int EpisodeFileId { get; set; }
         public int SeasonNumber { get; set; }
         public int EpisodeNumber { get; set; }

src/NzbDrone.Core/Tv/RefreshEpisodeService.cs

@@ -64,6 +64,7 @@ namespace NzbDrone.Core.Tv
                     }
 
                     episodeToUpdate.SeriesId = series.Id;
+                    episodeToUpdate.TvdbId = episode.TvdbId;
                     episodeToUpdate.EpisodeNumber = episode.EpisodeNumber;
                     episodeToUpdate.SeasonNumber = episode.SeasonNumber;
                     episodeToUpdate.AbsoluteEpisodeNumber = episode.AbsoluteEpisodeNumber;