Add download cleaner and dry run (#58)

code/Infrastructure/Verticals/DownloadClient/IDownloadService.cs

@@ -1,10 +1,12 @@
 using System.Collections.Concurrent;
 using System.Text.RegularExpressions;
 using Common.Configuration.ContentBlocker;
+using Common.Configuration.DownloadCleaner;
+using Infrastructure.Interceptors;
 
 namespace Infrastructure.Verticals.DownloadClient;
 
-public interface IDownloadService : IDisposable
+public interface IDownloadService : IDisposable, IDryRunService
 {
     public Task LoginAsync();
 
@@ -29,8 +31,23 @@ public interface IDownloadService : IDisposable
         ConcurrentBag<Regex> regexes
     );
 
+    /// <summary>
+    /// Fetches all downloads.
+    /// </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);
+    
+    /// <summary>
+    /// Cleans the downloads.
+    /// </summary>
+    /// <param name="downloads"></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);
+
     /// <summary>
     /// Deletes a download item.
     /// </summary>
-    public Task Delete(string hash);
+    public Task DeleteDownload(string hash);
 }