Fixed: Set part numbers using alphabetical file ordering if not set in tags

src/NzbDrone.Core.Test/MediaFiles/AudioTagServiceFixture.cs

@@ -326,6 +326,8 @@ namespace NzbDrone.Core.Test.MediaFiles.AudioTagServiceFixture
                 .With(x => x.Author = author)
                 .Build();
 
+            edition.BookFiles = new List<BookFile> { file };
+
             return file;
         }
 

src/NzbDrone.Core.Test/MediaFiles/ImportApprovedTracksFixture.cs

@@ -66,6 +66,7 @@ namespace NzbDrone.Core.Test.MediaFiles
                                            Author = author,
                                            Book = book,
                                            Edition = edition,
+                                           Part = 1,
                                            Path = Path.Combine(author.Path, "Alien Ant Farm - 01 - Pilot.mp3"),
                                            Quality = new QualityModel(Quality.MP3),
                                            FileTrackInfo = new ParsedTrackInfo
@@ -177,6 +178,7 @@ namespace NzbDrone.Core.Test.MediaFiles
                     Author = lqDecision.Item.Author,
                     Book = lqDecision.Item.Book,
                     Edition = lqDecision.Item.Edition,
+                    Part = 1,
                     Path = @"C:\Test\Music\Alien Ant Farm\Alien Ant Farm - 01 - Pilot.mp3".AsOsAgnostic(),
                     Quality = new QualityModel(Quality.AZW3),
                     Size = 1.Megabytes(),
@@ -209,6 +211,7 @@ namespace NzbDrone.Core.Test.MediaFiles
                     Author = fileDecision.Item.Author,
                     Book = fileDecision.Item.Book,
                     Edition = fileDecision.Item.Edition,
+                    Part = 1,
                     Path = @"C:\Test\Music\Alien Ant Farm\Alien Ant Farm - 01 - Pilot.mp3".AsOsAgnostic(),
                     Quality = new QualityModel(Quality.MP3),
                     Size = 80.Megabytes()

src/NzbDrone.Core/MediaFiles/AudioTagService.cs

@@ -73,6 +73,7 @@ namespace NzbDrone.Core.MediaFiles
             var edition = trackfile.Edition.Value;
             var book = edition.Book.Value;
             var author = book.Author.Value;
+            var partCount = edition.BookFiles.Value.Count;
 
             var fileTags = ReadAudioTag(trackfile.Path);
 
@@ -99,8 +100,8 @@ namespace NzbDrone.Core.MediaFiles
                 Title = edition.Title,
                 Performers = new[] { author.Name },
                 BookAuthors = new[] { author.Name },
-                Track = fileTags.Track,
-                TrackCount = fileTags.TrackCount,
+                Track = (uint)trackfile.Part,
+                TrackCount = (uint)partCount,
                 Book = book.Title,
                 Disc = fileTags.Disc,
                 DiscCount = fileTags.DiscCount,
@@ -219,14 +220,14 @@ namespace NzbDrone.Core.MediaFiles
         {
             var files = _mediaFileService.GetFilesByAuthor(authorId);
 
-            return GetPreviews(files).ToList();
+            return GetPreviews(files).OrderBy(b => b.BookId).ThenBy(b => b.Path).ToList();
         }
 
         public List<RetagBookFilePreview> GetRetagPreviewsByBook(int bookId)
         {
             var files = _mediaFileService.GetFilesByBook(bookId);
 
-            return GetPreviews(files).ToList();
+            return GetPreviews(files).OrderBy(b => b.BookId).ThenBy(b => b.Path).ToList();
         }
 
         private IEnumerable<RetagBookFilePreview> GetPreviews(List<BookFile> files)

src/NzbDrone.Core/MediaFiles/BookImport/ImportApprovedBooks.cs

@@ -1,6 +1,8 @@
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
+using System.Text.RegularExpressions;
 using NLog;
 using NzbDrone.Common.Disk;
 using NzbDrone.Common.Extensions;
@@ -15,6 +17,7 @@ using NzbDrone.Core.Extras;
 using NzbDrone.Core.MediaFiles.Events;
 using NzbDrone.Core.Messaging.Commands;
 using NzbDrone.Core.Messaging.Events;
+using NzbDrone.Core.Parser;
 using NzbDrone.Core.Parser.Model;
 using NzbDrone.Core.Qualities;
 using NzbDrone.Core.RootFolders;
@@ -28,6 +31,8 @@ namespace NzbDrone.Core.MediaFiles.BookImport
 
     public class ImportApprovedBooks : IImportApprovedBooks
     {
+        private static readonly RegexReplace PadNumbers = new RegexReplace(@"\d+", n => n.Value.PadLeft(9, '0'), RegexOptions.Compiled);
+
         private readonly IUpgradeMediaFiles _bookFileUpgrader;
         private readonly IMediaFileService _mediaFileService;
         private readonly IMetadataTagService _metadataTagService;
@@ -121,6 +126,17 @@ namespace NzbDrone.Core.MediaFiles.BookImport
                 //     RemoveExistingTrackFiles(author, book);
                 // }
 
+                // make sure part numbers are populated for audio books
+                // If all audio files and all part numbers are zero, set them by filename order
+                if (decisionList.All(b => MediaFileExtensions.AudioExtensions.Contains(Path.GetExtension(b.Item.Path)) && b.Item.Part == 0))
+                {
+                    var part = 1;
+                    foreach (var d in decisionList.OrderBy(x => PadNumbers.Replace(x.Item.Path)))
+                    {
+                        d.Item.Part = part++;
+                    }
+                }
+
                 // set the correct release to be monitored before importing the new files
                 var newRelease = bookDecision.First().Item.Edition;
                 _logger.Debug("Updating release to {0}", newRelease);