added category change for downloads with no additional hardlinks

code/Common/Configuration/DownloadCleaner/CleanCategory.cs

@@ -3,7 +3,7 @@ using Microsoft.Extensions.Configuration;
 
 namespace Common.Configuration.DownloadCleaner;
 
-public sealed record Category : IConfig
+public sealed record CleanCategory : IConfig
 {
     public required string Name { get; init; }
 

code/Common/Configuration/DownloadCleaner/DownloadCleanerConfig.cs

@@ -9,10 +9,16 @@ public sealed record DownloadCleanerConfig : IJobConfig
     
     public bool Enabled { get; init; }
 
-    public List<Category>? Categories { get; init; }
+    public List<CleanCategory>? Categories { get; init; }
 
     [ConfigurationKeyName("DELETE_PRIVATE")]
-    public bool DeletePrivate { get; set; }
+    public bool DeletePrivate { get; init; }
+
+    [ConfigurationKeyName("NO_HARDLINKS_CATEGORY")]
+    public string NoHardlinksCategory { get; init; } = "";
+
+    [ConfigurationKeyName("HARDLINK_CATEGORIES")]
+    public List<string>? HardlinkCategories { get; init; }
 
     public void Validate()
     {
@@ -32,5 +38,25 @@ public sealed record DownloadCleanerConfig : IJobConfig
         }
         
         Categories?.ForEach(x => x.Validate());
+        
+        if (string.IsNullOrEmpty(NoHardlinksCategory))
+        {
+            return;
+        }
+
+        if (HardlinkCategories?.Count is null or 0)
+        {
+            throw new ValidationException("no categories configured");
+        }
+
+        if (HardlinkCategories.Contains(NoHardlinksCategory))
+        {
+            throw new ValidationException("NO_HARDLINKS_CATEGORY is present in the list of filtered categories");
+        }
+
+        if (HardlinkCategories.Any(string.IsNullOrEmpty))
+        {
+            throw new ValidationException("empty hardlink filter category found");
+        }
     }
 }

code/Common/Configuration/Notification/NotificationConfig.cs

@@ -16,7 +16,15 @@ public abstract record NotificationConfig
     [ConfigurationKeyName("ON_DOWNLOAD_CLEANED")]
     public bool OnDownloadCleaned { get; init; }
     
-    public bool IsEnabled => OnImportFailedStrike || OnStalledStrike || OnQueueItemDeleted || OnDownloadCleaned;
+    [ConfigurationKeyName("ON_CATEGORY_CHANGED")]
+    public bool OnCategoryChanged { get; init; }
+
+    public bool IsEnabled =>
+        OnImportFailedStrike ||
+        OnStalledStrike ||
+        OnQueueItemDeleted ||
+        OnDownloadCleaned ||
+        OnCategoryChanged;
 
     public abstract bool IsValid();
 }

code/Executable/DependencyInjection/ServicesDI.cs

@@ -6,6 +6,7 @@ using Infrastructure.Verticals.DownloadClient;
 using Infrastructure.Verticals.DownloadClient.Deluge;
 using Infrastructure.Verticals.DownloadClient.QBittorrent;
 using Infrastructure.Verticals.DownloadClient.Transmission;
+using Infrastructure.Verticals.Files;
 using Infrastructure.Verticals.ItemStriker;
 using Infrastructure.Verticals.QueueCleaner;
 
@@ -23,6 +24,7 @@ public static class ServicesDI
             .AddTransient<ContentBlocker>()
             .AddTransient<DownloadCleaner>()
             .AddTransient<IFilenameEvaluator, FilenameEvaluator>()
+            .AddTransient<IHardlinkFileService, HardlinkFileService>()
             .AddTransient<DummyDownloadService>()
             .AddTransient<QBitService>()
             .AddTransient<DelugeService>()

code/Executable/appsettings.Development.json

@@ -44,6 +44,11 @@
         "MIN_SEED_TIME": 0,
         "MAX_SEED_TIME": -1
       }
+    ],
+    "NO_HARDLINKS_CATEGORY": "nohardlinks",
+    "HARDLINK_CATEGORIES": [
+      "tv-sonarr",
+      "radarr"
     ]
   },
   "DOWNLOAD_CLIENT": "qbittorrent",

code/Infrastructure.Tests/Verticals/DownloadClient/DownloadServiceFixture.cs

@@ -1,9 +1,10 @@
-using Common.Configuration.ContentBlocker;
+using Common.Configuration.ContentBlocker;
 using Common.Configuration.DownloadCleaner;
 using Common.Configuration.QueueCleaner;
 using Infrastructure.Interceptors;
 using Infrastructure.Verticals.ContentBlocker;
 using Infrastructure.Verticals.DownloadClient;
+using Infrastructure.Verticals.Files;
 using Infrastructure.Verticals.ItemStriker;
 using Infrastructure.Verticals.Notifications;
 using Microsoft.Extensions.Caching.Memory;
@@ -56,6 +57,7 @@ public class DownloadServiceFixture : IDisposable
         var filenameEvaluator = Substitute.For<IFilenameEvaluator>();
         var notifier = Substitute.For<INotificationPublisher>();
         var dryRunInterceptor = Substitute.For<IDryRunInterceptor>();
+        var hardlinkFileService = Substitute.For<IHardlinkFileService>();
 
         return new TestDownloadService(
             Logger,
@@ -66,7 +68,8 @@ public class DownloadServiceFixture : IDisposable
             filenameEvaluator,
             Striker,
             notifier,
-            dryRunInterceptor
+            dryRunInterceptor,
+            hardlinkFileService
         );
     }
 

code/Infrastructure.Tests/Verticals/DownloadClient/DownloadServiceTests.cs

@@ -132,7 +132,7 @@ public class DownloadServiceTests : IClassFixture<DownloadServiceFixture>
         public void WhenRatioAndMinSeedTimeReached_ShouldReturnTrue()
         {
             // Arrange
-            Category category = new()
+            CleanCategory category = new()
             {
                 Name = "test",
                 MaxRatio = 1.0,
@@ -158,7 +158,7 @@ public class DownloadServiceTests : IClassFixture<DownloadServiceFixture>
         public void WhenRatioReachedAndMinSeedTimeNotReached_ShouldReturnFalse()
         {
             // Arrange
-            Category category = new()
+            CleanCategory category = new()
             {
                 Name = "test",
                 MaxRatio = 1.0,
@@ -184,7 +184,7 @@ public class DownloadServiceTests : IClassFixture<DownloadServiceFixture>
         public void WhenMaxSeedTimeReached_ShouldReturnTrue()
         {
             // Arrange
-            Category category = new()
+            CleanCategory category = new()
             {
                 Name = "test",
                 MaxRatio = -1,
@@ -210,7 +210,7 @@ public class DownloadServiceTests : IClassFixture<DownloadServiceFixture>
         public void WhenNeitherConditionMet_ShouldReturnFalse()
         {
             // Arrange
-            Category category = new()
+            CleanCategory category = new()
             {
                 Name = "test",
                 MaxRatio = 2.0,

code/Infrastructure.Tests/Verticals/DownloadClient/TestDownloadService.cs

@@ -1,4 +1,4 @@
-using System.Collections.Concurrent;
+using System.Collections.Concurrent;
 using System.Text.RegularExpressions;
 using Common.Configuration.ContentBlocker;
 using Common.Configuration.DownloadCleaner;
@@ -6,6 +6,7 @@ using Common.Configuration.QueueCleaner;
 using Infrastructure.Interceptors;
 using Infrastructure.Verticals.ContentBlocker;
 using Infrastructure.Verticals.DownloadClient;
+using Infrastructure.Verticals.Files;
 using Infrastructure.Verticals.ItemStriker;
 using Infrastructure.Verticals.Notifications;
 using Microsoft.Extensions.Caching.Memory;
@@ -25,10 +26,11 @@ public class TestDownloadService : DownloadService
         IFilenameEvaluator filenameEvaluator,
         IStriker striker,
         INotificationPublisher notifier,
-        IDryRunInterceptor dryRunInterceptor
+        IDryRunInterceptor dryRunInterceptor,
+        IHardlinkFileService hardlinkFileService
     ) : base(
         logger, queueCleanerConfig, contentBlockerConfig, downloadCleanerConfig, cache,
-        filenameEvaluator, striker, notifier, dryRunInterceptor
+        filenameEvaluator, striker, notifier, dryRunInterceptor, hardlinkFileService
     )
     {
     }
@@ -38,12 +40,15 @@ public class TestDownloadService : DownloadService
     public override Task<StalledResult> ShouldRemoveFromArrQueueAsync(string hash) => Task.FromResult(new StalledResult());
     public override Task<BlockFilesResult> BlockUnwantedFilesAsync(string hash, BlocklistType blocklistType, 
         ConcurrentBag<string> patterns, ConcurrentBag<Regex> regexes) => Task.FromResult(new BlockFilesResult());
+
     public override Task DeleteDownload(string hash) => Task.CompletedTask;
-    public override Task<List<object>?> GetAllDownloadsToBeCleaned(List<Category> categories) => Task.FromResult<List<object>?>(null);
+    public override Task<List<object>?> GetDownloadsToBeCleaned(List<CleanCategory> categories) => Task.FromResult<List<object>?>(null);
-    public override Task CleanDownloads(List<object> downloads, List<Category> categoriesToClean, HashSet<string> excludedHashes) => Task.CompletedTask;
+    public override Task<List<object>?> GetDownloadsToChangeCategory(List<string> categories) => Task.FromResult<List<object>?>(null);
+    public override Task CleanDownloads(List<object> downloads, List<CleanCategory> categoriesToClean, HashSet<string> excludedHashes) => Task.CompletedTask;
+    public override Task ChangeCategoryForNoHardlinksAsync(List<object> downloads, HashSet<string> excludedHashes) => Task.CompletedTask;
     
     // Expose protected methods for testing
     public new void ResetStrikesOnProgress(string hash, long downloaded) => base.ResetStrikesOnProgress(hash, downloaded);
     public new Task<bool> StrikeAndCheckLimit(string hash, string itemName) => base.StrikeAndCheckLimit(hash, itemName);
-    public new SeedingCheckResult ShouldCleanDownload(double ratio, TimeSpan seedingTime, Category category) => base.ShouldCleanDownload(ratio, seedingTime, category);
+    public new SeedingCheckResult ShouldCleanDownload(double ratio, TimeSpan seedingTime, CleanCategory category) => base.ShouldCleanDownload(ratio, seedingTime, category);
 }

code/Infrastructure/Verticals/DownloadCleaner/DownloadCleaner.cs

@@ -60,11 +60,20 @@ public sealed class DownloadCleaner : GenericHandler
         
         await _downloadService.LoginAsync();
 
-        List<object>? downloads = await _downloadService.GetAllDownloadsToBeCleaned(_config.Categories);
+        List<object>? downloadsToBeCleaned = await _downloadService.GetDownloadsToBeCleaned(_config.Categories);
+        List<object>? downloadsToChangeCategory = null;
 
-        if (downloads?.Count is null or 0)
+        if (!string.IsNullOrEmpty(_config.NoHardlinksCategory) && _config.HardlinkCategories?.Count > 0)
         {
-            _logger.LogDebug("no downloads found in the download client");
+            downloadsToChangeCategory = await _downloadService.GetDownloadsToChangeCategory(_config.HardlinkCategories);
+        }
+        
+        bool hasDownloadsToClean = downloadsToBeCleaned?.Count > 0;
+        bool hasDownloadsToChange = downloadsToChangeCategory?.Count > 0;
+
+        if (!hasDownloadsToClean && !hasDownloadsToChange)
+        {
+            _logger.LogDebug("no downloads to process");
             return;
         }
 
@@ -75,7 +84,23 @@ public sealed class DownloadCleaner : GenericHandler
         await ProcessArrConfigAsync(_radarrConfig, InstanceType.Radarr, true);
         await ProcessArrConfigAsync(_lidarrConfig, InstanceType.Lidarr, true);
         
-        await _downloadService.CleanDownloads(downloads, _config.Categories, _excludedHashes);
+        if (hasDownloadsToChange)
+        {
+            await _downloadService.ChangeCategoryForNoHardlinksAsync(downloadsToChangeCategory, _excludedHashes);
+        }
+        else
+        {
+            _logger.LogDebug("no downloads found to change category");
+        }
+        
+        if (hasDownloadsToClean)
+        {
+            await _downloadService.CleanDownloads(downloadsToBeCleaned, _config.Categories, _excludedHashes);
+        }
+        else
+        {
+            _logger.LogDebug("no downloads found to be cleaned");
+        }
     }
 
     protected override async Task ProcessInstanceAsync(ArrInstance instance, InstanceType instanceType)

code/Infrastructure/Verticals/DownloadClient/Deluge/DelugeService.cs

@@ -10,6 +10,7 @@ using Domain.Models.Deluge.Response;
 using Infrastructure.Interceptors;
 using Infrastructure.Verticals.ContentBlocker;
 using Infrastructure.Verticals.Context;
+using Infrastructure.Verticals.Files;
 using Infrastructure.Verticals.ItemStriker;
 using Infrastructure.Verticals.Notifications;
 using Microsoft.Extensions.Caching.Memory;
@@ -33,10 +34,11 @@ public class DelugeService : DownloadService, IDelugeService
         IFilenameEvaluator filenameEvaluator,
         IStriker striker,
         INotificationPublisher notifier,
-        IDryRunInterceptor dryRunInterceptor
+        IDryRunInterceptor dryRunInterceptor,
+        IHardlinkFileService hardlinkFileService
     ) : base(
         logger, queueCleanerConfig, contentBlockerConfig, downloadCleanerConfig, cache,
-        filenameEvaluator, striker, notifier, dryRunInterceptor
+        filenameEvaluator, striker, notifier, dryRunInterceptor, hardlinkFileService
     )
     {
         config.Value.Validate();
@@ -194,7 +196,7 @@ public class DelugeService : DownloadService, IDelugeService
         return result;
     }
 
-    public override async Task<List<object>?> GetAllDownloadsToBeCleaned(List<Category> categories)
+    public override async Task<List<object>?> GetDownloadsToBeCleaned(List<CleanCategory> categories)
     {
         return (await _client.GetStatusForAllTorrents())
             ?.Where(x => !string.IsNullOrEmpty(x.Hash))
@@ -204,8 +206,13 @@ public class DelugeService : DownloadService, IDelugeService
             .ToList();
     }
 
+    public override Task<List<object>?> GetDownloadsToChangeCategory(List<string> categories)
+    {
+        throw new NotImplementedException();
+    }
+
     /// <inheritdoc/>
-    public override async Task CleanDownloads(List<object> downloads, List<Category> categoriesToClean, HashSet<string> excludedHashes)
+    public override async Task CleanDownloads(List<object> downloads, List<CleanCategory> categoriesToClean, HashSet<string> excludedHashes)
     {
         foreach (TorrentStatus download in downloads)
         {
@@ -214,7 +221,7 @@ public class DelugeService : DownloadService, IDelugeService
                 continue;
             }
             
-            Category? category = categoriesToClean
+            CleanCategory? category = categoriesToClean
                 .FirstOrDefault(x => x.Name.Equals(download.Label, StringComparison.InvariantCultureIgnoreCase));
 
             if (category is null)
@@ -259,6 +266,11 @@ public class DelugeService : DownloadService, IDelugeService
         }
     }
 
+    public override Task ChangeCategoryForNoHardlinksAsync(List<object> downloads, HashSet<string> excludedHashes)
+    {
+        throw new NotImplementedException();
+    }
+
     /// <inheritdoc/>
     [DryRunSafeguard]
     public override async Task DeleteDownload(string hash)

code/Infrastructure/Verticals/DownloadClient/DownloadService.cs

@@ -1,4 +1,4 @@
-using System.Collections.Concurrent;
+using System.Collections.Concurrent;
 using System.Text.RegularExpressions;
 using Common.Configuration.ContentBlocker;
 using Common.Configuration.DownloadCleaner;
@@ -10,6 +10,7 @@ using Infrastructure.Helpers;
 using Infrastructure.Interceptors;
 using Infrastructure.Verticals.ContentBlocker;
 using Infrastructure.Verticals.Context;
+using Infrastructure.Verticals.Files;
 using Infrastructure.Verticals.ItemStriker;
 using Infrastructure.Verticals.Notifications;
 using Microsoft.Extensions.Caching.Memory;
@@ -30,6 +31,7 @@ public abstract class DownloadService : IDownloadService
     protected readonly MemoryCacheEntryOptions _cacheOptions;
     protected readonly INotificationPublisher _notifier;
     protected readonly IDryRunInterceptor _dryRunInterceptor;
+    protected readonly IHardlinkFileService _hardlinkFileService;
 
     protected DownloadService(
         ILogger<DownloadService> logger,
@@ -40,7 +42,8 @@ public abstract class DownloadService : IDownloadService
         IFilenameEvaluator filenameEvaluator,
         IStriker striker,
         INotificationPublisher notifier,
-        IDryRunInterceptor dryRunInterceptor
+        IDryRunInterceptor dryRunInterceptor,
+        IHardlinkFileService hardlinkFileService
     )
     {
         _logger = logger;
@@ -52,6 +55,7 @@ public abstract class DownloadService : IDownloadService
         _striker = striker;
         _notifier = notifier;
         _dryRunInterceptor = dryRunInterceptor;
+        _hardlinkFileService = hardlinkFileService;
         _cacheOptions = new MemoryCacheEntryOptions()
             .SetSlidingExpiration(StaticConfiguration.TriggerValue + Constants.CacheLimitBuffer);
     }
@@ -74,10 +78,16 @@ public abstract class DownloadService : IDownloadService
     public abstract Task DeleteDownload(string hash);
 
     /// <inheritdoc/>
-    public abstract Task<List<object>?> GetAllDownloadsToBeCleaned(List<Category> categories);
+    public abstract Task<List<object>?> GetDownloadsToBeCleaned(List<CleanCategory> categories);
 
     /// <inheritdoc/>
-    public abstract Task CleanDownloads(List<object> downloads, List<Category> categoriesToClean, HashSet<string> excludedHashes);
+    public abstract Task<List<object>?> GetDownloadsToChangeCategory(List<string> categories);
+
+    /// <inheritdoc/>
+    public abstract Task CleanDownloads(List<object> downloads, List<CleanCategory> categoriesToClean, HashSet<string> excludedHashes);
+
+    /// <inheritdoc/>
+    public abstract Task ChangeCategoryForNoHardlinksAsync(List<object> downloads, HashSet<string> excludedHashes);
     
     protected void ResetStrikesOnProgress(string hash, long downloaded)
     {
@@ -107,7 +117,7 @@ public abstract class DownloadService : IDownloadService
         return await _striker.StrikeAndCheckLimit(hash, itemName, _queueCleanerConfig.StalledMaxStrikes, StrikeType.Stalled);
     }
     
-    protected SeedingCheckResult ShouldCleanDownload(double ratio, TimeSpan seedingTime, Category category)
+    protected SeedingCheckResult ShouldCleanDownload(double ratio, TimeSpan seedingTime, CleanCategory category)
     {
         // check ratio
         if (DownloadReachedRatio(ratio, seedingTime, category))
@@ -132,7 +142,7 @@ public abstract class DownloadService : IDownloadService
         return new();
     }
     
-    private bool DownloadReachedRatio(double ratio, TimeSpan seedingTime, Category category)
+    private bool DownloadReachedRatio(double ratio, TimeSpan seedingTime, CleanCategory category)
     {
         if (category.MaxRatio < 0)
         {
@@ -158,7 +168,7 @@ public abstract class DownloadService : IDownloadService
         return true;
     }
     
-    private bool DownloadReachedMaxSeedTime(TimeSpan seedingTime, Category category)
+    private bool DownloadReachedMaxSeedTime(TimeSpan seedingTime, CleanCategory category)
     {
         if (category.MaxSeedTime < 0)
         {

code/Infrastructure/Verticals/DownloadClient/DummyDownloadService.cs

@@ -1,10 +1,11 @@
-using System.Collections.Concurrent;
+using System.Collections.Concurrent;
 using System.Text.RegularExpressions;
 using Common.Configuration.ContentBlocker;
 using Common.Configuration.DownloadCleaner;
 using Common.Configuration.QueueCleaner;
 using Infrastructure.Interceptors;
 using Infrastructure.Verticals.ContentBlocker;
+using Infrastructure.Verticals.Files;
 using Infrastructure.Verticals.ItemStriker;
 using Infrastructure.Verticals.Notifications;
 using Microsoft.Extensions.Caching.Memory;
@@ -15,7 +16,21 @@ namespace Infrastructure.Verticals.DownloadClient;
 
 public class DummyDownloadService : DownloadService
 {
-    public DummyDownloadService(ILogger<DownloadService> logger, IOptions<QueueCleanerConfig> queueCleanerConfig, IOptions<ContentBlockerConfig> contentBlockerConfig, IOptions<DownloadCleanerConfig> downloadCleanerConfig, IMemoryCache cache, IFilenameEvaluator filenameEvaluator, IStriker striker, INotificationPublisher notifier, IDryRunInterceptor dryRunInterceptor) : base(logger, queueCleanerConfig, contentBlockerConfig, downloadCleanerConfig, cache, filenameEvaluator, striker, notifier, dryRunInterceptor)
+    public DummyDownloadService(
+        ILogger<DownloadService> logger,
+        IOptions<QueueCleanerConfig> queueCleanerConfig,
+        IOptions<ContentBlockerConfig> contentBlockerConfig,
+        IOptions<DownloadCleanerConfig> downloadCleanerConfig,
+        IMemoryCache cache,
+        IFilenameEvaluator filenameEvaluator,
+        IStriker striker,
+        NotificationPublisher notifier,
+        IDryRunInterceptor dryRunInterceptor,
+        IHardlinkFileService hardlinkFileService
+    ) : base(
+        logger, queueCleanerConfig, contentBlockerConfig, downloadCleanerConfig,
+        cache, filenameEvaluator, striker, notifier, dryRunInterceptor, hardlinkFileService
+    )
     {
     }
 
@@ -38,12 +53,22 @@ public class DummyDownloadService : DownloadService
         throw new NotImplementedException();
     }
 
-    public override Task<List<object>?> GetAllDownloadsToBeCleaned(List<Category> categories)
+    public override Task<List<object>?> GetDownloadsToBeCleaned(List<CleanCategory> categories)
     {
         throw new NotImplementedException();
     }
 
-    public override Task CleanDownloads(List<object> downloads, List<Category> categoriesToClean, HashSet<string> excludedHashes)
+    public override Task<List<object>?> GetDownloadsToChangeCategory(List<string> categories)
+    {
+        throw new NotImplementedException();
+    }
+
+    public override Task CleanDownloads(List<object> downloads, List<CleanCategory> categoriesToClean, HashSet<string> excludedHashes)
+    {
+        throw new NotImplementedException();
+    }
+
+    public override Task ChangeCategoryForNoHardlinksAsync(List<object> downloads, HashSet<string> excludedHashes)
     {
         throw new NotImplementedException();
     }

code/Infrastructure/Verticals/DownloadClient/IDownloadService.cs

@@ -36,15 +36,24 @@ public interface IDownloadService : IDisposable
     /// </summary>
     /// <param name="categories">The categories by which to filter the downloads.</param>
     /// <returns>A list of downloads for the provided categories.</returns>
-    Task<List<object>?> GetAllDownloadsToBeCleaned(List<Category> categories);
+    Task<List<object>?> GetDownloadsToBeCleaned(List<CleanCategory> categories);
+
+    Task<List<object>?> GetDownloadsToChangeCategory(List<string> categories);
     
     /// <summary>
     /// Cleans the downloads.
     /// </summary>
-    /// <param name="downloads"></param>
+    /// <param name="downloads">The downloads to clean.</param>
     /// <param name="categoriesToClean">The categories that should be cleaned.</param>
     /// <param name="excludedHashes">The hashes that should not be cleaned.</param>
-    public abstract Task CleanDownloads(List<object> downloads, List<Category> categoriesToClean, HashSet<string> excludedHashes);
+    Task CleanDownloads(List<object> downloads, List<CleanCategory> categoriesToClean, HashSet<string> excludedHashes);
+
+    /// <summary>
+    /// Changes the category for downloads that have no hardlinks.
+    /// </summary>
+    /// <param name="downloads">The downloads to change.</param>
+    /// <param name="excludedHashes"></param>
+    Task ChangeCategoryForNoHardlinksAsync(List<object> downloads, HashSet<string> excludedHashes);
     
     /// <summary>
     /// Deletes a download item.

code/Infrastructure/Verticals/DownloadClient/QBittorrent/QBitService.cs

@@ -10,13 +10,13 @@ using Domain.Enums;
 using Infrastructure.Interceptors;
 using Infrastructure.Verticals.ContentBlocker;
 using Infrastructure.Verticals.Context;
+using Infrastructure.Verticals.Files;
 using Infrastructure.Verticals.ItemStriker;
 using Infrastructure.Verticals.Notifications;
 using Microsoft.Extensions.Caching.Memory;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 using QBittorrent.Client;
-using Category = Common.Configuration.DownloadCleaner.Category;
 
 namespace Infrastructure.Verticals.DownloadClient.QBittorrent;
 
@@ -36,10 +36,11 @@ public class QBitService : DownloadService, IQBitService
         IFilenameEvaluator filenameEvaluator,
         IStriker striker,
         INotificationPublisher notifier,
-        IDryRunInterceptor dryRunInterceptor
+        IDryRunInterceptor dryRunInterceptor,
+        IHardlinkFileService hardlinkFileService
     ) : base(
         logger, queueCleanerConfig, contentBlockerConfig, downloadCleanerConfig, cache,
-        filenameEvaluator, striker, notifier, dryRunInterceptor
+        filenameEvaluator, striker, notifier, dryRunInterceptor, hardlinkFileService
     )
     {
         _config = config.Value;
@@ -207,7 +208,7 @@ public class QBitService : DownloadService, IQBitService
     }
     
     /// <inheritdoc/>
-    public override async Task<List<object>?> GetAllDownloadsToBeCleaned(List<Category> categories) =>
+    public override async Task<List<object>?> GetDownloadsToBeCleaned(List<CleanCategory> categories) =>
         (await _client.GetTorrentListAsync(new()
         {
             Filter = TorrentListFilter.Seeding
@@ -217,8 +218,19 @@ public class QBitService : DownloadService, IQBitService
         .Cast<object>()
         .ToList();
 
+    public override async Task<List<object>?> GetDownloadsToChangeCategory(List<string> categories)
+    {
+        return (await _client.GetTorrentListAsync(new()
+            {
+                Filter = TorrentListFilter.Seeding
+            }))
+            ?.Where(x => !string.IsNullOrEmpty(x.Hash))
+            .Cast<object>()
+            .ToList();
+    }
+
     /// <inheritdoc/>
-    public override async Task CleanDownloads(List<object> downloads, List<Category> categoriesToClean, HashSet<string> excludedHashes)
+    public override async Task CleanDownloads(List<object> downloads, List<CleanCategory> categoriesToClean, HashSet<string> excludedHashes)
     {
         foreach (TorrentInfo download in downloads)
         {
@@ -227,7 +239,7 @@ public class QBitService : DownloadService, IQBitService
                 continue;
             }
             
-            Category? category = categoriesToClean
+            CleanCategory? category = categoriesToClean
                 .FirstOrDefault(x => download.Category.Equals(x.Name, StringComparison.InvariantCultureIgnoreCase));
             
             if (category is null)
@@ -286,6 +298,52 @@ public class QBitService : DownloadService, IQBitService
         }
     }
 
+    public override async Task ChangeCategoryForNoHardlinksAsync(List<object> downloads, HashSet<string> excludedHashes)
+    {
+        // TODO account for cross-seed
+        foreach (TorrentInfo download in downloads)
+        {
+            IReadOnlyList<TorrentContent>? files = await _client.GetTorrentContentsAsync(download.Hash);
+
+            if (files is null)
+            {
+                _logger.LogDebug("failed to find files for {name}", download.Name);
+                return;
+            }
+            
+            if (excludedHashes.Any(x => x.Equals(download.Hash, StringComparison.InvariantCultureIgnoreCase)))
+            {
+                _logger.LogDebug("skip | download is used by an arr | {name}", download.Name);
+                continue;
+            }
+
+            bool hasHardlinks = false;
+            
+            foreach (TorrentContent file in files)
+            {
+                if (!file.Index.HasValue)
+                {
+                    _logger.LogDebug("skip | file index is null for {name}", download.Name);
+                    return;
+                }
+
+                if (_hardlinkFileService.GetHardLinkCount(file.Name) > 1)
+                {
+                    hasHardlinks = true;
+                };
+            }
+            
+            if (hasHardlinks)
+            {
+                _logger.LogDebug("skip | download has hardlinks | {name}", download.Name);
+                continue;
+            }
+            
+            await ((QBitService)Proxy).ChangeCategory(download.Hash, _downloadCleanerConfig.NoHardlinksCategory);
+            await _notifier.NotifyCategoryChanged(download.Category, _downloadCleanerConfig.NoHardlinksCategory);
+        }
+    }
+    
     /// <inheritdoc/>
     [DryRunSafeguard]
     public override async Task DeleteDownload(string hash)
@@ -299,6 +357,12 @@ public class QBitService : DownloadService, IQBitService
         await _client.SetFilePriorityAsync(hash, fileIndex, TorrentContentPriority.Skip);
     }
 
+    [DryRunSafeguard]
+    protected virtual async Task ChangeCategory(string hash, string newCategory)
+    {
+        await _client.SetTorrentCategoryAsync([hash], newCategory);
+    }
+
     public override void Dispose()
     {
         _client.Dispose();

code/Infrastructure/Verticals/DownloadClient/Transmission/TransmissionService.cs

@@ -10,6 +10,7 @@ using Domain.Enums;
 using Infrastructure.Interceptors;
 using Infrastructure.Verticals.ContentBlocker;
 using Infrastructure.Verticals.Context;
+using Infrastructure.Verticals.Files;
 using Infrastructure.Verticals.ItemStriker;
 using Infrastructure.Verticals.Notifications;
 using Microsoft.Extensions.Caching.Memory;
@@ -38,10 +39,11 @@ public class TransmissionService : DownloadService, ITransmissionService
         IFilenameEvaluator filenameEvaluator,
         IStriker striker,
         INotificationPublisher notifier,
-        IDryRunInterceptor dryRunInterceptor
+        IDryRunInterceptor dryRunInterceptor,
+        IHardlinkFileService hardlinkFileService
     ) : base(
         logger, queueCleanerConfig, contentBlockerConfig, downloadCleanerConfig, cache,
-        filenameEvaluator, striker, notifier, dryRunInterceptor
+        filenameEvaluator, striker, notifier, dryRunInterceptor, hardlinkFileService
     )
     {
         _config = config.Value;
@@ -181,7 +183,7 @@ public class TransmissionService : DownloadService, ITransmissionService
     }
 
     /// <inheritdoc/>
-    public override async Task<List<object>?> GetAllDownloadsToBeCleaned(List<Category> categories)
+    public override async Task<List<object>?> GetDownloadsToBeCleaned(List<CleanCategory> categories)
     {
         string[] fields = [
             TorrentFields.FILES,
@@ -218,8 +220,13 @@ public class TransmissionService : DownloadService, ITransmissionService
             .ToList();
     }
 
+    public override Task<List<object>?> GetDownloadsToChangeCategory(List<string> categories)
+    {
+        throw new NotImplementedException();
+    }
+
     /// <inheritdoc/>
-    public override async Task CleanDownloads(List<object> downloads, List<Category> categoriesToClean, HashSet<string> excludedHashes)
+    public override async Task CleanDownloads(List<object> downloads, List<CleanCategory> categoriesToClean, HashSet<string> excludedHashes)
     {
         foreach (TorrentInfo download in downloads)
         {
@@ -228,7 +235,7 @@ public class TransmissionService : DownloadService, ITransmissionService
                 continue;
             }
             
-            Category? category = categoriesToClean
+            CleanCategory? category = categoriesToClean
                 .FirstOrDefault(x =>
                 {
                     if (download.DownloadDir is null)
@@ -282,6 +289,11 @@ public class TransmissionService : DownloadService, ITransmissionService
         }
     }
 
+    public override Task ChangeCategoryForNoHardlinksAsync(List<object> downloads, HashSet<string> excludedHashes)
+    {
+        throw new NotImplementedException();
+    }
+
     public override async Task DeleteDownload(string hash)
     {
         TorrentInfo? torrent = await GetTorrentAsync(hash);

code/Infrastructure/Verticals/Files/HardlinkFileService.cs

@@ -0,0 +1,99 @@
+using System.Runtime.InteropServices;
+using Microsoft.Extensions.Logging;
+using Microsoft.Win32.SafeHandles;
+
+namespace Infrastructure.Verticals.Files;
+
+public class HardlinkFileService : IHardlinkFileService
+{
+    private readonly ILogger<HardlinkFileService> _logger;
+    
+    public HardlinkFileService(ILogger<HardlinkFileService> logger)
+    {
+        _logger = logger;
+    }
+    
+    public uint GetHardLinkCount(string filePath)
+    {
+        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+        {
+            return GetWindowsHardLinkCount(filePath);
+        }
+
+        return GetUnixHardLinkCount(filePath);
+    }
+
+    private uint GetWindowsHardLinkCount(string filePath)
+    {
+        try
+        {
+            using SafeFileHandle fileStream = File.OpenHandle(filePath);
+
+            if (GetFileInformationByHandle(fileStream, out var file))
+            {
+                return file.NumberOfLinks;
+            }
+        }
+        catch (Exception exception)
+        {
+            // TODO log download name?
+            _logger.LogError(exception, "failed to stat Windows file {file}", filePath);
+        }
+
+        return default;
+    }
+
+    [DllImport("kernel32.dll", SetLastError = true)]
+    private static extern bool GetFileInformationByHandle(
+        SafeFileHandle hFile,
+        out BY_HANDLE_FILE_INFORMATION lpFileInformation
+    );
+
+    private struct BY_HANDLE_FILE_INFORMATION
+    {
+        public uint FileAttributes;
+        public System.Runtime.InteropServices.ComTypes.FILETIME CreationTime;
+        public System.Runtime.InteropServices.ComTypes.FILETIME LastAccessTime;
+        public System.Runtime.InteropServices.ComTypes.FILETIME LastWriteTime;
+        public uint VolumeSerialNumber;
+        public uint FileSizeHigh;
+        public uint FileSizeLow;
+        public uint NumberOfLinks;
+        public uint FileIndexHigh;
+        public uint FileIndexLow;
+    }
+
+    private uint GetUnixHardLinkCount(string filePath)
+    {
+        try
+        {
+            if (stat64(filePath, out Stat stat) == 0)
+            {
+                return stat.st_nlink;
+            }
+        }
+        catch (Exception exception)
+        {
+            // TODO log download name?
+            _logger.LogError(exception, "failed to stat Unix file {file}", filePath);
+        }
+
+        return 0;
+    }
+
+    [DllImport("libc", SetLastError = true)]
+    private static extern int stat64(string path, out Stat stat);
+
+    [StructLayout(LayoutKind.Sequential)]
+    private struct Stat
+    {
+        public uint st_dev;
+        public ulong st_ino;
+        public uint st_mode;
+        public uint st_nlink; // Hard link count
+        public uint st_uid;
+        public uint st_gid;
+        public uint st_rdev;
+        public long st_size;
+    }
+}

code/Infrastructure/Verticals/Files/IHardlinkFileService.cs

@@ -0,0 +1,6 @@
+namespace Infrastructure.Verticals.Files;
+
+public interface IHardlinkFileService
+{
+    uint GetHardLinkCount(string filePath);
+}

code/Infrastructure/Verticals/Notifications/Consumers/NotificationConsumer.cs

@@ -33,6 +33,9 @@ public sealed class NotificationConsumer<T> : IConsumer<T> where T : Notificatio
                 case DownloadCleanedNotification downloadCleanedNotification:
                     await _notificationService.Notify(downloadCleanedNotification);
                     break;
+                case CategoryChangedNotification categoryChangedNotification:
+                    await _notificationService.Notify(categoryChangedNotification);
+                    break;
                 default:
                     throw new NotImplementedException();
             }

code/Infrastructure/Verticals/Notifications/INotificationFactory.cs

@@ -9,4 +9,6 @@ public interface INotificationFactory
     List<INotificationProvider> OnQueueItemDeletedEnabled();
 
     List<INotificationProvider> OnDownloadCleanedEnabled();
+    
+    List<INotificationProvider> OnCategoryChangedEnabled();
 }

code/Infrastructure/Verticals/Notifications/INotificationProvider.cs

@@ -16,4 +16,6 @@ public interface INotificationProvider
     Task OnQueueItemDeleted(QueueItemDeletedNotification notification);
 
     Task OnDownloadCleaned(DownloadCleanedNotification notification);
+    
+    Task OnCategoryChanged(CategoryChangedNotification notification);
 }

code/Infrastructure/Verticals/Notifications/Models/CategoryChangedNotification.cs

@@ -0,0 +1,5 @@
+namespace Infrastructure.Verticals.Notifications.Models;
+
+public sealed record CategoryChangedNotification : Notification
+{
+}

code/Infrastructure/Verticals/Notifications/Notifiarr/NotifiarrProvider.cs

@@ -42,6 +42,11 @@ public class NotifiarrProvider : NotificationProvider
         await _proxy.SendNotification(BuildPayload(notification), _config);
     }
     
+    public override async Task OnCategoryChanged(CategoryChangedNotification notification)
+    {
+        await _proxy.SendNotification(BuildPayload(notification), _config);
+    }
+
     private NotifiarrPayload BuildPayload(ArrNotification notification, string color)
     {
         NotifiarrPayload payload = new()
@@ -105,4 +110,32 @@ public class NotifiarrProvider : NotificationProvider
         
         return payload;
     }
+
+    private NotifiarrPayload BuildPayload(CategoryChangedNotification notification)
+    {
+        NotifiarrPayload payload = new()
+        {
+            Discord = new()
+            {
+                Color = WarningColor,
+                Text = new()
+                {
+                    Title = notification.Title,
+                    Icon = Logo,
+                    Description = notification.Description,
+                    Fields = notification.Fields?.Adapt<List<Field>>() ?? []
+                },
+                Ids = new Ids
+                {
+                    Channel = _config.ChannelId
+                },
+                Images = new()
+                {
+                    Thumbnail = new Uri(Logo)
+                }
+            }
+        };
+        
+        return payload;
+    }
 }

code/Infrastructure/Verticals/Notifications/NotificationFactory.cs

@@ -34,4 +34,9 @@ public class NotificationFactory : INotificationFactory
         ActiveProviders()
             .Where(n => n.Config.OnDownloadCleaned)
             .ToList();
+    
+    public List<INotificationProvider> OnCategoryChangedEnabled() =>
+        ActiveProviders()
+            .Where(n => n.Config.OnCategoryChanged)
+            .ToList();
 }

code/Infrastructure/Verticals/Notifications/NotificationProvider.cs

@@ -22,4 +22,6 @@ public abstract class NotificationProvider : INotificationProvider
     public abstract Task OnQueueItemDeleted(QueueItemDeletedNotification notification);
 
     public abstract Task OnDownloadCleaned(DownloadCleanedNotification notification);
+    
+    public abstract Task OnCategoryChanged(CategoryChangedNotification notification);
 }

code/Infrastructure/Verticals/Notifications/NotificationPublisher.cs

@@ -107,6 +107,25 @@ public class NotificationPublisher : INotificationPublisher
         return _messageBus.Publish(message);
     }
 
+    [DryRunSafeguard]
+    public virtual async Task NotifyCategoryChanged(string oldCategory, string newCategory)
+    {
+        CategoryChangedNotification notification = new()
+        {
+            Title = "Category changed",
+            Description = ContextProvider.Get<string>("downloadName"),
+            Fields =
+            [
+                new() { Title = "Hash", Text = ContextProvider.Get<string>("hash").ToLowerInvariant() },
+                new() { Title = "Old category", Text = oldCategory },
+                new() { Title = "New category", Text = newCategory }
+            ],
+            Level = NotificationLevel.Important
+        };
+
+        await _messageBus.Publish(notification);
+    }
+    
     private static Uri GetImageFromContext(QueueRecord record, InstanceType instanceType) =>
         instanceType switch
         {

code/Infrastructure/Verticals/Notifications/NotificationService.cs

@@ -73,4 +73,19 @@ public class NotificationService
             }
         }
     }
+    
+    public async Task Notify(CategoryChangedNotification notification)
+    {
+        foreach (INotificationProvider provider in _notificationFactory.OnCategoryChangedEnabled())
+        {
+            try
+            {
+                await provider.OnCategoryChanged(notification);
+            }
+            catch (Exception exception)
+            {
+                _logger.LogWarning(exception, "failed to send notification | provider {provider}", provider.Name);
+            }
+        }
+    }
 }

code/test/docker-compose.yml

@@ -209,11 +209,14 @@ services:
       - DOWNLOADCLEANER__CATEGORIES__0__NAME=tv-sonarr
       - DOWNLOADCLEANER__CATEGORIES__0__MAX_RATIO=-1
       - DOWNLOADCLEANER__CATEGORIES__0__MIN_SEED_TIME=0
-      - DOWNLOADCLEANER__CATEGORIES__0__MAX_SEED_TIME=0.01
+      - DOWNLOADCLEANER__CATEGORIES__0__MAX_SEED_TIME=-1
       - DOWNLOADCLEANER__CATEGORIES__1__NAME=radarr
       - DOWNLOADCLEANER__CATEGORIES__1__MAX_RATIO=-1
       - DOWNLOADCLEANER__CATEGORIES__1__MIN_SEED_TIME=0
-      - DOWNLOADCLEANER__CATEGORIES__1__MAX_SEED_TIME=0.01
+      - DOWNLOADCLEANER__CATEGORIES__1__MAX_SEED_TIME=-1
+
+      - DOWNLOADCLEANER__HARDLINK_CATEGORIES__0=tv-sonarr
+      - DOWNLOADCLEANER__HARDLINK_CATEGORIES__1=radarr
 
       - DOWNLOAD_CLIENT=qbittorrent
       - QBITTORRENT__URL=http://qbittorrent:8080
@@ -252,10 +255,12 @@ services:
       # - NOTIFIARR__ON_STALLED_STRIKE=true
       # - NOTIFIARR__ON_QUEUE_ITEM_DELETED=true
       # - NOTIFIARR__ON_DOWNLOAD_CLEANED=true
+      # - NOTIFIARR__ON_CATEGORY_CHANGED=true
       # - NOTIFIARR__API_KEY=notifiarr_secret
       # - NOTIFIARR__CHANNEL_ID=discord_channel_id
     volumes:
       - ./data/cleanuperr/logs:/var/logs
+      - ./data/qbittorrent/downloads:/downloads
     restart: unless-stopped
     depends_on:
       - qbittorrent