Cleanup orphaned seasons when deleting episodes

NzbDrone.Core.Test/NzbDrone.Core.Test.csproj

@@ -186,6 +186,7 @@
     <Compile Include="ProviderTests\DiskProviderTests\ArchiveProviderFixture.cs" />
     <Compile Include="MediaFileTests\DropFolderImportServiceFixture.cs" />
     <Compile Include="SeriesStatsTests\SeriesStatisticsFixture.cs" />
+    <Compile Include="TvTests\SeasonServiceTests\HandleEpisodeInfoDeletedEventFixture.cs" />
     <Compile Include="TvTests\SeasonServiceTests\SetSeasonPassFixture.cs" />
     <Compile Include="TvTests\SeasonServiceTests\SetMonitoredFixture.cs" />
     <Compile Include="TvTests\SeriesRepositoryTests\QualityProfileRepositoryFixture.cs" />

NzbDrone.Core.Test/TvTests/SeasonServiceTests/HandleEpisodeInfoDeletedEventFixture.cs

@@ -0,0 +1,93 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using FizzWare.NBuilder;
+using Moq;
+using NUnit.Framework;
+using NzbDrone.Core.Test.Framework;
+using NzbDrone.Core.Tv;
+using NzbDrone.Core.Tv.Events;
+
+namespace NzbDrone.Core.Test.TvTests.SeasonServiceTests
+{
+    [TestFixture]
+    public class HandleEpisodeInfoDeletedEventFixture : CoreTest<SeasonService>
+    {
+        private List<Season> _seasons;
+        private List<Episode> _episodes;
+
+        [SetUp]
+        public void Setup()
+        {
+            _seasons = Builder<Season>
+                .CreateListOfSize(1)
+                .All()
+                .With(s => s.SeriesId = 1)
+                .Build()
+                .ToList();
+
+            _episodes = Builder<Episode>
+                .CreateListOfSize(1)
+                .All()
+                .With(e => e.SeasonNumber = _seasons.First().SeasonNumber)
+                .With(s => s.SeriesId = _seasons.First().SeasonNumber)
+                .Build()
+                .ToList();
+
+            Mocker.GetMock<ISeasonRepository>()
+                  .Setup(s => s.GetSeasonBySeries(It.IsAny<int>()))
+                  .Returns(_seasons);
+
+            Mocker.GetMock<IEpisodeService>()
+                .Setup(s => s.GetEpisodesBySeason(It.IsAny<int>(), _seasons.First().SeasonNumber))
+                .Returns(_episodes);
+        }
+
+        private void GivenAbandonedSeason()
+        {
+            Mocker.GetMock<IEpisodeService>()
+                .Setup(s => s.GetEpisodesBySeason(It.IsAny<int>(), _seasons.First().SeasonNumber))
+                .Returns(new List<Episode>());
+        }
+
+        [Test]
+        public void should_not_delete_when_season_is_still_valid()
+        {           
+            Subject.Handle(new EpisodeInfoDeletedEvent(_episodes));
+
+            Mocker.GetMock<ISeasonRepository>()
+                .Verify(v => v.Delete(It.IsAny<Season>()), Times.Never());
+        }
+
+        [Test]
+        public void should_delete_season_if_no_episodes_exist_in_that_season()
+        {
+            GivenAbandonedSeason();
+
+            Subject.Handle(new EpisodeInfoDeletedEvent(_episodes));
+
+            Mocker.GetMock<ISeasonRepository>()
+                .Verify(v => v.Delete(It.IsAny<Season>()), Times.Once());
+        }
+
+        [Test]
+        public void should_only_delete_a_season_once()
+        {
+            _episodes = Builder<Episode>
+                .CreateListOfSize(5)
+                .All()
+                .With(e => e.SeasonNumber = _seasons.First().SeasonNumber)
+                .With(s => s.SeriesId = _seasons.First().SeasonNumber)
+                .Build()
+                .ToList();
+
+            GivenAbandonedSeason();
+
+            Subject.Handle(new EpisodeInfoDeletedEvent(_episodes));
+
+            Mocker.GetMock<ISeasonRepository>()
+                .Verify(v => v.Delete(It.IsAny<Season>()), Times.Once());
+        }
+    }
+}

NzbDrone.Core/NzbDrone.Core.csproj

@@ -350,6 +350,7 @@
     <Compile Include="Rest\RestException.cs" />
     <Compile Include="SeriesStats\SeriesStatisticsService.cs" />
     <Compile Include="Tv\EpisodeService.cs" />
+    <Compile Include="Tv\Events\EpisodeInfoDeletedEvent.cs" />
     <Compile Include="Tv\Events\EpisodeInfoUpdatedEvent.cs" />
     <Compile Include="Tv\Events\EpisodeInfoAddedEvent.cs" />
     <Compile Include="Tv\Events\SeriesAddedEvent.cs" />

NzbDrone.Core/Tv/Events/EpisodeInfoDeletedEvent.cs

@@ -0,0 +1,16 @@
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using NzbDrone.Common.Messaging;
+
+namespace NzbDrone.Core.Tv.Events
+{
+    public class EpisodeInfoDeletedEvent : IEvent
+    {
+        public ReadOnlyCollection<Episode> Episodes { get; private set; }
+
+        public EpisodeInfoDeletedEvent(IList<Episode> episodes)
+        {
+            Episodes = new ReadOnlyCollection<Episode>(episodes);
+        }
+    }
+}

NzbDrone.Core/Tv/RefreshEpisodeService.cs

@@ -34,7 +34,7 @@ namespace NzbDrone.Core.Tv
             var successCount = 0;
             var failCount = 0;
 
-            var existinEpisodes = _episodeService.GetEpisodeBySeries(series.Id);
+            var existingEpisodes = _episodeService.GetEpisodeBySeries(series.Id);
             var seasons = _seasonService.GetSeasonsBySeries(series.Id);
 
             var updateList = new List<Episode>();
@@ -44,11 +44,11 @@ namespace NzbDrone.Core.Tv
             {
                 try
                 {
-                    var episodeToUpdate = existinEpisodes.SingleOrDefault(e => e.SeasonNumber == episode.SeasonNumber && e.EpisodeNumber == episode.EpisodeNumber);
+                    var episodeToUpdate = existingEpisodes.SingleOrDefault(e => e.SeasonNumber == episode.SeasonNumber && e.EpisodeNumber == episode.EpisodeNumber);
 
                     if (episodeToUpdate != null)
                     {
-                        existinEpisodes.Remove(episodeToUpdate);
+                        existingEpisodes.Remove(episodeToUpdate);
                         updateList.Add(episodeToUpdate);
                     }
                     else
@@ -82,11 +82,10 @@ namespace NzbDrone.Core.Tv
 
             AdjustMultiEpisodeAirTime(series, allEpisodes);
 
-            _episodeService.DeleteMany(existinEpisodes);
+            _episodeService.DeleteMany(existingEpisodes);
             _episodeService.UpdateMany(updateList);
             _episodeService.InsertMany(newList);
 
-
             if (newList.Any())
             {
                 _messageAggregator.PublishEvent(new EpisodeInfoAddedEvent(newList, series));
@@ -97,6 +96,11 @@ namespace NzbDrone.Core.Tv
                 _messageAggregator.PublishEvent(new EpisodeInfoUpdatedEvent(updateList));
             }
 
+            if (existingEpisodes.Any())
+            {
+                _messageAggregator.PublishEvent(new EpisodeInfoDeletedEvent(updateList));
+            }
+
             if (failCount != 0)
             {
                 _logger.Info("Finished episode refresh for series: {0}. Successful: {1} - Failed: {2} ",