New: Use XEM season number for some releases when mapping episodes

Closes #5195

src/NzbDrone.Core.Test/ParserTests/ParsingServiceTests/MapFixture.cs

@@ -220,5 +220,45 @@ namespace NzbDrone.Core.Test.ParserTests.ParsingServiceTests
             Mocker.GetMock<ISeriesService>()
                   .Verify(v => v.FindByTitle(It.IsAny<string>()), Times.Never());
         }
+
+        [Test]
+        public void should_use_scene_season_number_from_xem_mapping_if_alias_matches_a_specific_season_number()
+        {
+            _parsedEpisodeInfo.SeasonNumber = 1;
+
+            var sceneMapping = new SceneMapping
+            {
+                Type = "XemService",
+                SceneSeasonNumber = 2
+            };
+
+            Mocker.GetMock<ISceneMappingService>()
+                .Setup(s => s.FindSceneMapping(_parsedEpisodeInfo.SeriesTitle, _parsedEpisodeInfo.ReleaseTitle, _parsedEpisodeInfo.SeasonNumber))
+                .Returns(sceneMapping);
+
+            var result = Subject.Map(_parsedEpisodeInfo, _series);
+
+            result.MappedSeasonNumber.Should().Be(sceneMapping.SceneSeasonNumber);
+        }
+
+        [Test]
+        public void should_not_use_scene_season_number_from_xem_mapping_if_alias_matches_a_specific_season_number_but_did_not_parse_season_1()
+        {
+            _parsedEpisodeInfo.SeasonNumber = 2;
+
+            var sceneMapping = new SceneMapping
+            {
+                Type = "XemService",
+                SceneSeasonNumber = 2
+            };
+
+            Mocker.GetMock<ISceneMappingService>()
+                .Setup(s => s.FindSceneMapping(_parsedEpisodeInfo.SeriesTitle, _parsedEpisodeInfo.ReleaseTitle, _parsedEpisodeInfo.SeasonNumber))
+                .Returns(sceneMapping);
+
+            var result = Subject.Map(_parsedEpisodeInfo, _series);
+
+            result.MappedSeasonNumber.Should().Be(sceneMapping.SceneSeasonNumber);
+        }
     }
 }

src/NzbDrone.Core/Parser/ParsingService.cs

@@ -163,6 +163,13 @@ namespace NzbDrone.Core.Parser
                 {
                     sceneSource = false;
                 }
+                else if (sceneMapping.Type == "XemService" &&
+                         sceneMapping.SceneSeasonNumber.HasValue &&
+                         parsedEpisodeInfo.SeasonNumber == 1 &&
+                         sceneMapping.SceneSeasonNumber != parsedEpisodeInfo.SeasonNumber)
+                {
+                    remoteEpisode.MappedSeasonNumber = sceneMapping.SceneSeasonNumber.Value;
+                }
             }
 
             if (series == null)