Check history when retrying downloads with SAB

Fixed: Retrying a download shouldn't cause drone to lose track of it

src/NzbDrone.Core.Test/Download/DownloadClientTests/SabnzbdTests/SabnzbdFixture.cs

@@ -1,17 +1,13 @@
 using System;
-using System.IO;
 using System.Linq;
 using System.Collections.Generic;
 using FizzWare.NBuilder;
 using FluentAssertions;
 using Moq;
 using NUnit.Framework;
-using NzbDrone.Common;
 using NzbDrone.Core.Download;
 using NzbDrone.Core.Download.Clients.Sabnzbd;
 using NzbDrone.Core.Download.Clients.Sabnzbd.Responses;
-using NzbDrone.Core.Parser.Model;
-using NzbDrone.Core.Test.Framework;
 using NzbDrone.Core.Tv;
 using NzbDrone.Test.Common;
 using NzbDrone.Core.RemotePathMappings;

src/NzbDrone.Core/Download/Clients/Sabnzbd/Sabnzbd.cs

@@ -208,27 +208,44 @@ namespace NzbDrone.Core.Download.Clients.Sabnzbd
         public override String RetryDownload(String id)
         {
             // Sabnzbd changed the nzo_id for retried downloads without reporting it back to us. We need to try to determine the new ID.
+            // Check both the queue and history because sometimes SAB keeps item in history to retry post processing (depends on failure reason)
 
-            var history = GetHistory().Where(v => v.DownloadClientId == id).ToList();
+            var currentHistory = GetHistory().ToList();
+            var currentHistoryItems = currentHistory.Where(v => v.DownloadClientId == id).ToList();
 
-            _proxy.RetryDownload(id, Settings);
-
-            if (history.Count() != 1)
+            if (currentHistoryItems.Count != 1)
             {
                 _logger.Warn("History item missing. Couldn't get the new nzoid.");
                 return id;
             }
 
+            var currentHistoryItem = currentHistoryItems.First();
+            var otherItemsWithSameTitle = currentHistory.Where(h => h.Title == currentHistoryItem.Title &&
+                                                               h.DownloadClientId != currentHistoryItem.DownloadClientId).ToList();
+            
+            _proxy.RetryDownload(id, Settings);           
+
             for (int i = 0; i < 3; i++)
             {
-                var queue = GetQueue().Where(v => v.Category == history.First().Category && v.Title == history.First().Title).ToList();
+                var queue = GetQueue().Where(v => v.Category == currentHistoryItem.Category &&
+                                                  v.Title == currentHistoryItem.Title).ToList();
+
+                var history = GetHistory().Where(v => v.Category == currentHistoryItem.Category &&
+                                                      v.Title == currentHistoryItem.Title &&
+                                                      otherItemsWithSameTitle.Select(h => h.DownloadClientId)
+                                                                             .Contains(v.DownloadClientId)).ToList();
 
-                if (queue.Count() == 1)
+                if (queue.Count == 1)
                 {
                     return queue.First().DownloadClientId;
                 }
 
-                if (queue.Count() > 2)
+                if (history.Count == 1)
+                {
+                    return history.First().DownloadClientId;
+                }
+
+                if (queue.Count > 1 || history.Count > 1)
                 {
                     _logger.Warn("Multiple items with the correct title. Couldn't get the new nzoid.");
                     return id;