New: Missing/Cutoff Unmet searches will search for episodes that haven't been searched recently first

Closes #3067

src/NzbDrone.Core/IndexerSearch/EpisodeSearchGroup.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using NzbDrone.Core.Tv;
+
+namespace NzbDrone.Core.IndexerSearch
+{
+    public class EpisodeSearchGroup
+    {
+        public int SeriesId { get; set; }
+        public int SeasonNumber { get; set; }
+        public List<Episode> Episodes { get; set; }
+    }
+}

src/NzbDrone.Core/IndexerSearch/EpisodeSearchService.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Linq.Expressions;
 using NLog;
 using NzbDrone.Common.Extensions;
 using NzbDrone.Common.Instrumentation.Extensions;
@@ -40,46 +39,63 @@ namespace NzbDrone.Core.IndexerSearch
             _logger = logger;
         }
 
-        private void SearchForEpisodes(List<Episode> episodes, bool monitoredOnly, bool userInvokedSearch)
+        private void SearchForBulkEpisodes(List<Episode> episodes, bool monitoredOnly, bool userInvokedSearch)
         {
             _logger.ProgressInfo("Performing search for {0} episodes", episodes.Count);
             var downloadedCount = 0;
+            var groups = new List<EpisodeSearchGroup>();
 
             foreach (var series in episodes.GroupBy(e => e.SeriesId))
             {
                 foreach (var season in series.Select(e => e).GroupBy(e => e.SeasonNumber))
                 {
-                    List<DownloadDecision> decisions;
+                    groups.Add(new EpisodeSearchGroup
+                    {
+                        SeriesId = series.Key,
+                        SeasonNumber = season.Key,
+                        Episodes = season.ToList()
+                    });
+                }
+            }
+
+            foreach (var group in groups.OrderBy(g => g.Episodes.Min(e => e.LastSearchTime ?? DateTime.MinValue)))
+            {
+                List<DownloadDecision> decisions;
 
-                    if (season.Count() > 1)
+                var seriesId = group.SeriesId;
+                var seasonNumber = group.SeasonNumber;
+                var groupEpisodes = group.Episodes;
+
+                if (groupEpisodes.Count > 1)
+                {
+                    try
                     {
-                        try
-                        {
-                            decisions = _releaseSearchService.SeasonSearch(series.Key, season.Key, season.ToList(), monitoredOnly, userInvokedSearch, false);
-                        }
-                        catch (Exception ex)
-                        {
-                            _logger.Error(ex, "Unable to search for episodes in season {0} of [{1}]", season.Key, series.Key);
-                            continue;
-                        }
+                        decisions = _releaseSearchService.SeasonSearch(seriesId, seasonNumber, groupEpisodes, monitoredOnly, userInvokedSearch, false);
                     }
-                    else
+                    catch (Exception ex)
                     {
-                        try
-                        {
-                            decisions = _releaseSearchService.EpisodeSearch(season.First(), userInvokedSearch, false);
-                        }
-                        catch (Exception ex)
-                        {
-                            _logger.Error(ex, "Unable to search for episode: [{0}]", season.First());
-                            continue;
-                        }
+                        _logger.Error(ex, "Unable to search for episodes in season {0} of [{1}]", seasonNumber, seriesId);
+                        continue;
                     }
+                }
+                else
+                {
+                    var episode = groupEpisodes.First();
 
-                    var processed = _processDownloadDecisions.ProcessDecisions(decisions);
-
-                    downloadedCount += processed.Grabbed.Count;
+                    try
+                    {
+                        decisions = _releaseSearchService.EpisodeSearch(episode, userInvokedSearch, false);
+                    }
+                    catch (Exception ex)
+                    {
+                        _logger.Error(ex, "Unable to search for episode: [{0}]", episode);
+                        continue;
+                    }
                 }
+
+                var processed = _processDownloadDecisions.ProcessDecisions(decisions);
+
+                downloadedCount += processed.Grabbed.Count;
             }
 
             _logger.ProgressInfo("Completed search for {0} episodes. {1} reports downloaded.", episodes.Count, downloadedCount);
@@ -120,7 +136,7 @@ namespace NzbDrone.Core.IndexerSearch
                 var pagingSpec = new PagingSpec<Episode>
                                  {
                                      Page = 1,
-                                     PageSize = 100000,
+                                     PageSize = 1000000,
                                      SortDirection = SortDirection.Ascending,
                                      SortKey = "Id"
                                  };
@@ -140,7 +156,7 @@ namespace NzbDrone.Core.IndexerSearch
             var queue = _queueService.GetQueue().Where(q => q.Episode != null).Select(q => q.Episode.Id);
             var missing = episodes.Where(e => !queue.Contains(e.Id)).ToList();
 
-            SearchForEpisodes(missing, monitored, message.Trigger == CommandTrigger.Manual);
+            SearchForBulkEpisodes(missing, monitored, message.Trigger == CommandTrigger.Manual);
         }
 
         public void Execute(CutoffUnmetEpisodeSearchCommand message)
@@ -174,7 +190,7 @@ namespace NzbDrone.Core.IndexerSearch
             var queue = _queueService.GetQueue().Where(q => q.Episode != null).Select(q => q.Episode.Id);
             var cutoffUnmet = episodes.Where(e => !queue.Contains(e.Id)).ToList();
 
-            SearchForEpisodes(cutoffUnmet, monitored, message.Trigger == CommandTrigger.Manual);
+            SearchForBulkEpisodes(cutoffUnmet, monitored, message.Trigger == CommandTrigger.Manual);
         }
     }
 }

src/NzbDrone.Core/IndexerSearch/ReleaseSearchService.cs

@@ -540,7 +540,7 @@ namespace NzbDrone.Core.IndexerSearch
                 _logger.Debug("Setting last search time to: {0}", lastSearchTime);
 
                 criteriaBase.Episodes.ForEach(e => e.LastSearchTime = lastSearchTime);
-                _episodeService.UpdateEpisodes(criteriaBase.Episodes);
+                _episodeService.UpdateLastSearchTime(criteriaBase.Episodes);
             }
 
             return _makeDownloadDecision.GetSearchDecision(reports, criteriaBase).ToList();

src/NzbDrone.Core/Tv/EpisodeService.cs

@@ -31,6 +31,7 @@ namespace NzbDrone.Core.Tv
         void SetEpisodeMonitored(int episodeId, bool monitored);
         void SetMonitored(IEnumerable<int> ids, bool monitored);
         void UpdateEpisodes(List<Episode> episodes);
+        void UpdateLastSearchTime(List<Episode> episodes);
         List<Episode> EpisodesBetweenDates(DateTime start, DateTime end, bool includeUnmonitored);
         void InsertMany(List<Episode> episodes);
         void UpdateMany(List<Episode> episodes);
@@ -187,6 +188,11 @@ namespace NzbDrone.Core.Tv
             _episodeRepository.UpdateMany(episodes);
         }
 
+        public void UpdateLastSearchTime(List<Episode> episodes)
+        {
+            _episodeRepository.SetFields(episodes, e => e.LastSearchTime);
+        }
+
         public List<Episode> EpisodesBetweenDates(DateTime start, DateTime end, bool includeUnmonitored)
         {
             var episodes = _episodeRepository.EpisodesBetweenDates(start.ToUniversalTime(), end.ToUniversalTime(), includeUnmonitored);