Fix: Use indexer's Multi Languages setting for pushed releases

Closes #7059

src/NzbDrone.Core.Test/Download/Aggregation/Aggregators/AggregateLanguagesFixture.cs

@@ -4,6 +4,8 @@ using FizzWare.NBuilder;
 using FluentAssertions;
 using NUnit.Framework;
 using NzbDrone.Core.Download.Aggregation.Aggregators;
+using NzbDrone.Core.Indexers;
+using NzbDrone.Core.Indexers.TorrentRss;
 using NzbDrone.Core.Languages;
 using NzbDrone.Core.Parser.Model;
 using NzbDrone.Core.Test.Framework;
@@ -62,6 +64,63 @@ namespace NzbDrone.Core.Test.Download.Aggregation.Aggregators
             Subject.Aggregate(_remoteEpisode).Languages.Should().Equal(_remoteEpisode.ParsedEpisodeInfo.Languages);
         }
 
+        [Test]
+        public void should_return_multi_languages_when_indexer_has_multi_languages_configuration()
+        {
+            var releaseTitle = "Series.Title.S01E01.MULTi.1080p.WEB.H265-RlsGroup";
+            var indexerDefinition = new IndexerDefinition
+            {
+                Settings = new TorrentRssIndexerSettings { MultiLanguages = new List<int> { Language.Original.Id, Language.French.Id } }
+            };
+            Mocker.GetMock<IIndexerFactory>()
+                .Setup(v => v.Get(1))
+                .Returns(indexerDefinition);
+
+            _remoteEpisode.ParsedEpisodeInfo = GetParsedEpisodeInfo(new List<Language> { }, releaseTitle);
+            _remoteEpisode.Release.IndexerId = 1;
+            _remoteEpisode.Release.Title = releaseTitle;
+
+            Subject.Aggregate(_remoteEpisode).Languages.Should().BeEquivalentTo(new List<Language> { _series.OriginalLanguage, Language.French });
+        }
+
+        [Test]
+        public void should_return_multi_languages_when_release_as_unknown_as_default_language_and_indexer_has_multi_languages_configuration()
+        {
+            var releaseTitle = "Series.Title.S01E01.MULTi.1080p.WEB.H265-RlsGroup";
+            var indexerDefinition = new IndexerDefinition
+            {
+                Settings = new TorrentRssIndexerSettings { MultiLanguages = new List<int> { Language.Original.Id, Language.French.Id } }
+            };
+            Mocker.GetMock<IIndexerFactory>()
+                .Setup(v => v.Get(1))
+                .Returns(indexerDefinition);
+
+            _remoteEpisode.ParsedEpisodeInfo = GetParsedEpisodeInfo(new List<Language> { Language.Unknown }, releaseTitle);
+            _remoteEpisode.Release.IndexerId = 1;
+            _remoteEpisode.Release.Title = releaseTitle;
+
+            Subject.Aggregate(_remoteEpisode).Languages.Should().BeEquivalentTo(new List<Language> { _series.OriginalLanguage, Language.French });
+        }
+
+        [Test]
+        public void should_return_original_when_indexer_has_no_multi_languages_configuration()
+        {
+            var releaseTitle = "Series.Title.S01E01.MULTi.1080p.WEB.H265-RlsGroup";
+            var indexerDefinition = new IndexerDefinition
+            {
+                Settings = new TorrentRssIndexerSettings { }
+            };
+            Mocker.GetMock<IIndexerFactory>()
+                .Setup(v => v.Get(1))
+                .Returns(indexerDefinition);
+
+            _remoteEpisode.ParsedEpisodeInfo = GetParsedEpisodeInfo(new List<Language> { }, releaseTitle);
+            _remoteEpisode.Release.IndexerId = 1;
+            _remoteEpisode.Release.Title = releaseTitle;
+
+            Subject.Aggregate(_remoteEpisode).Languages.Should().BeEquivalentTo(new List<Language> { _series.OriginalLanguage });
+        }
+
         [Test]
         public void should_exclude_language_that_is_part_of_episode_title_when_release_tokens_contains_episode_title()
         {

src/NzbDrone.Core/Download/Aggregation/Aggregators/AggregateLanguages.cs

@@ -2,6 +2,8 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using NLog;
+using NzbDrone.Common.Extensions;
+using NzbDrone.Core.Indexers;
 using NzbDrone.Core.Languages;
 using NzbDrone.Core.Parser;
 using NzbDrone.Core.Parser.Model;
@@ -10,10 +12,13 @@ namespace NzbDrone.Core.Download.Aggregation.Aggregators
 {
     public class AggregateLanguages : IAggregateRemoteEpisode
     {
+        private readonly IIndexerFactory _indexerFactory;
         private readonly Logger _logger;
 
-        public AggregateLanguages(Logger logger)
+        public AggregateLanguages(IIndexerFactory indexerFactory,
+                                  Logger logger)
         {
+            _indexerFactory = indexerFactory;
             _logger = logger;
         }
 
@@ -71,6 +76,17 @@ namespace NzbDrone.Core.Download.Aggregation.Aggregators
                 languages = languages.Except(languagesToRemove).ToList();
             }
 
+            if ((languages.Count == 0 || (languages.Count == 1 && languages.First() == Language.Unknown)) && releaseInfo is { IndexerId: > 0 } && releaseInfo.Title.IsNotNullOrWhiteSpace())
+            {
+                var indexer = _indexerFactory.Get(releaseInfo.IndexerId);
+
+                if (indexer?.Settings is IIndexerSettings settings && settings.MultiLanguages.Any() && Parser.Parser.HasMultipleLanguages(releaseInfo.Title))
+                {
+                    // Use indexer setting for Multi-languages
+                    languages = settings.MultiLanguages.Select(i => (Language)i).ToList();
+                }
+            }
+
             // Use series language as fallback if we couldn't parse a language
             if (languages.Count == 0 || (languages.Count == 1 && languages.First() == Language.Unknown))
             {

src/NzbDrone.Core/Indexers/IndexerBase.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 using FluentValidation.Results;
 using NLog;
@@ -20,8 +19,6 @@ namespace NzbDrone.Core.Indexers
     public abstract class IndexerBase<TSettings> : IIndexer
         where TSettings : IIndexerSettings, new()
     {
-        private static readonly Regex MultiRegex = new (@"[_. ](?<multi>multi)[_. ]", RegexOptions.Compiled | RegexOptions.IgnoreCase);
-
         protected readonly IIndexerStatusService _indexerStatusService;
         protected readonly IConfigService _configService;
         protected readonly IParsingService _parsingService;
@@ -94,7 +91,7 @@ namespace NzbDrone.Core.Indexers
             result.ForEach(c =>
             {
                 // Use multi languages from setting if ReleaseInfo languages is empty
-                if (c.Languages.Empty() && MultiRegex.IsMatch(c.Title) && settings.MultiLanguages.Any())
+                if (c.Languages.Empty() && settings.MultiLanguages.Any() && Parser.Parser.HasMultipleLanguages(c.Title))
                 {
                     c.Languages = settings.MultiLanguages.Select(i => (Language)i).ToList();
                 }

src/NzbDrone.Core/Parser/Parser.cs

@@ -575,6 +575,8 @@ namespace NzbDrone.Core.Parser
 
         private static readonly string[] Numbers = new[] { "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine" };
 
+        private static readonly Regex MultiRegex = new (@"[_. ](?<multi>multi)[_. ]", RegexOptions.Compiled | RegexOptions.IgnoreCase);
+
         public static ParsedEpisodeInfo ParsePath(string path)
         {
             var fileInfo = new FileInfo(path);
@@ -959,6 +961,11 @@ namespace NzbDrone.Core.Parser
             return title;
         }
 
+        public static bool HasMultipleLanguages(string title)
+        {
+            return MultiRegex.IsMatch(title);
+        }
+
         private static SeriesTitleInfo GetSeriesTitleInfo(string title, MatchCollection matchCollection)
         {
             var seriesTitleInfo = new SeriesTitleInfo();