support getting all episodes per series

MediaBrowser.Api/TvShowsService.cs

@@ -413,7 +413,18 @@ namespace MediaBrowser.Api
 
             IEnumerable<Episode> episodes;
 
-            if (string.IsNullOrEmpty(request.SeasonId))
+            if (!string.IsNullOrWhiteSpace(request.SeasonId))
+            {
+                var season = _libraryManager.GetItemById(new Guid(request.SeasonId)) as Season;
+
+                if (season == null)
+                {
+                    throw new ResourceNotFoundException("No season exists with Id " + request.SeasonId);
+                }
+
+                episodes = season.GetEpisodes(user);
+            } 
+            else if (request.Season.HasValue)
             {
                 var series = _libraryManager.GetItemById(request.Id) as Series;
 
@@ -426,14 +437,14 @@ namespace MediaBrowser.Api
             }
             else
             {
-                var season = _libraryManager.GetItemById(new Guid(request.SeasonId)) as Season;
+                var series = _libraryManager.GetItemById(request.Id) as Series;
 
-                if (season == null)
+                if (series == null)
                 {
-                    throw new ResourceNotFoundException("No season exists with Id " + request.SeasonId);
+                    throw new ResourceNotFoundException("No series exists with Id " + request.Id);
                 }
 
-                episodes = season.GetEpisodes(user);
+                episodes = series.GetEpisodes(user);
             }
 
             // Filter after the fact in case the ui doesn't want them

MediaBrowser.Controller/Entities/TV/Series.cs

@@ -185,6 +185,31 @@ namespace MediaBrowser.Controller.Entities.TV
                 .Cast<Season>();
         }
 
+        public IEnumerable<Episode> GetEpisodes(User user)
+        {
+            var config = user.Configuration;
+            
+            var allEpisodes = GetSeasons(user, true, true)
+                .SelectMany(i => i.GetEpisodes(user, config.DisplayMissingEpisodes, config.DisplayUnairedEpisodes))
+                .Reverse()
+                .ToList();
+
+            // Specials could appear twice based on above - once in season 0, once in the aired season
+            // This depends on settings for that series
+            // When this happens, remove the duplicate from season 0
+            var returnList = new List<Episode>();
+
+            foreach (var episode in allEpisodes)
+            {
+                if (!returnList.Contains(episode))
+                {
+                    returnList.Insert(0, episode);
+                }
+            }
+
+            return returnList;
+        }
+
         public IEnumerable<Episode> GetEpisodes(User user, int seasonNumber)
         {
             var config = user.Configuration;