Do not import episodes with the same filename and size

NzbDrone.Core/MediaFiles/EpisodeImport/Specifications/NotExistingFileSpecification.cs

@@ -0,0 +1,39 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using NLog;
+using NzbDrone.Core.Parser.Model;
+
+namespace NzbDrone.Core.MediaFiles.EpisodeImport.Specifications
+{
+    public class NotExistingFileSpecification : IImportDecisionEngineSpecification
+    {
+        private readonly Logger _logger;
+
+        public NotExistingFileSpecification(Logger logger)
+        {
+            _logger = logger;
+        }
+
+        public string RejectionReason { get { return "Existing File"; } }
+
+        public bool IsSatisfiedBy(LocalEpisode localEpisode)
+        {
+            var episodeFiles = localEpisode.Episodes.Where(e => e.EpisodeFileId > 0).Select(e => e.EpisodeFile.Value);
+
+            foreach (var episodeFile in episodeFiles)
+            {
+                if (Path.GetFileName(episodeFile.Path) == Path.GetFileName(localEpisode.Path) &&
+                    episodeFile.Size == localEpisode.Size)
+                {
+                    _logger.Trace("File is a match for an existing episode file: {0}", localEpisode.Path);
+                    return false;
+                }
+            }
+
+            return true;
+        }
+    }
+}