New: Prefer anime batch releases over single episode releases

src/NzbDrone.Core.Test/DecisionEngineTests/PrioritizeDownloadDecisionFixture.cs

@@ -217,6 +217,37 @@ namespace NzbDrone.Core.Test.DecisionEngineTests
             qualifiedReports.First().RemoteEpisode.ParsedEpisodeInfo.FullSeason.Should().BeTrue();
         }
 
+        [Test]
+        public void should_prefer_multiepisode_over_single_episode_for_anime()
+        {
+            var remoteEpisode1 = GivenRemoteEpisode(new List<Episode> { GivenEpisode(1), GivenEpisode(2) }, new QualityModel(Quality.HDTV720p));
+            var remoteEpisode2 = GivenRemoteEpisode(new List<Episode> { GivenEpisode(1) }, new QualityModel(Quality.HDTV720p));
+
+            remoteEpisode1.Series.SeriesType = SeriesTypes.Anime;
+            remoteEpisode2.Series.SeriesType = SeriesTypes.Anime;
+
+            var decisions = new List<DownloadDecision>();
+            decisions.Add(new DownloadDecision(remoteEpisode1));
+            decisions.Add(new DownloadDecision(remoteEpisode2));
+
+            var qualifiedReports = Subject.PrioritizeDecisions(decisions);
+            qualifiedReports.First().RemoteEpisode.Episodes.Count.Should().Be(remoteEpisode1.Episodes.Count);
+        }
+
+        [Test]
+        public void should_prefer_single_episode_over_multi_episode_for_non_anime()
+        {
+            var remoteEpisode1 = GivenRemoteEpisode(new List<Episode> { GivenEpisode(1), GivenEpisode(2) }, new QualityModel(Quality.HDTV720p));
+            var remoteEpisode2 = GivenRemoteEpisode(new List<Episode> { GivenEpisode(1) }, new QualityModel(Quality.HDTV720p));
+
+            var decisions = new List<DownloadDecision>();
+            decisions.Add(new DownloadDecision(remoteEpisode1));
+            decisions.Add(new DownloadDecision(remoteEpisode2));
+
+            var qualifiedReports = Subject.PrioritizeDecisions(decisions);
+            qualifiedReports.First().RemoteEpisode.Episodes.Count.Should().Be(remoteEpisode2.Episodes.Count);
+        }
+
         [Test]
         public void should_prefer_releases_with_more_seeders()
         {

src/NzbDrone.Core/DecisionEngine/DownloadDecisionComparer.cs

@@ -4,6 +4,7 @@ using System.Linq;
 using NzbDrone.Core.Indexers;
 using NzbDrone.Core.Parser.Model;
 using NzbDrone.Core.Profiles.Delay;
+using NzbDrone.Core.Tv;
 
 namespace NzbDrone.Core.DecisionEngine
 {
@@ -75,8 +76,21 @@ namespace NzbDrone.Core.DecisionEngine
 
         private int CompareEpisodeCount(DownloadDecision x, DownloadDecision y)
         {
-            return CompareAll(CompareBy(x.RemoteEpisode, y.RemoteEpisode, remoteEpisode => remoteEpisode.ParsedEpisodeInfo.FullSeason),
-                           CompareByReverse(x.RemoteEpisode, y.RemoteEpisode, remoteEpisode => remoteEpisode.Episodes.Count));
+            var seasonPackCompare = CompareBy(x.RemoteEpisode, y.RemoteEpisode,
+                remoteEpisode => remoteEpisode.ParsedEpisodeInfo.FullSeason);
+
+            if (seasonPackCompare != 0)
+            {
+                return seasonPackCompare;
+            }
+
+            if (x.RemoteEpisode.Series.SeriesType == SeriesTypes.Anime &
+                y.RemoteEpisode.Series.SeriesType == SeriesTypes.Anime)
+            {
+                return CompareBy(x.RemoteEpisode, y.RemoteEpisode, remoteEpisode => remoteEpisode.Episodes.Count);
+            }
+
+            return CompareByReverse(x.RemoteEpisode, y.RemoteEpisode, remoteEpisode => remoteEpisode.Episodes.Count);
         }
 
         private int CompareEpisodeNumber(DownloadDecision x, DownloadDecision y)