OPDS Flattening (#1904)

* Flattening OPDS Structure

# Changed
- Flattened OPDS structure to reduce user taps.

* Fixing format

* Fixing book series titles

* Optimized file size to use pre-calculated data to avoid an I/O touch.

* Fixes #1898 by aligning all content headers to the correct MIME types

* Remove dead code

* Fixed a bug with continue point where it fails on chapters or volumes tagged with a range

---------

Co-authored-by: Robbie Davis <robbie@therobbiedavis.com>

API/Services/DownloadService.cs

@@ -4,6 +4,7 @@ using System.IO;
 using System.Linq;
 using API.Entities;
 using Microsoft.AspNetCore.StaticFiles;
+using MimeTypes;
 
 namespace API.Services;
 
@@ -47,7 +48,7 @@ public class DownloadService : IDownloadService
                 ".zip" => "application/zip",
                 ".tar.gz" => "application/gzip",
                 ".pdf" => "application/pdf",
-                _ => contentType
+                _ => MimeTypeMap.GetMimeType(contentType)
             };
         }
 

API/Services/ReaderService.cs

@@ -495,7 +495,7 @@ public class ReaderService : IReaderService
         // NOTE: If volume 1 has chapter 1 and volume 2 is just chapter 0 due to being a full volume file, then this fails
         // If there are any volumes that have progress, return those. If not, move on.
         var currentlyReadingChapter = volumeChapters
-            .OrderBy(c => double.Parse(c.Range), _chapterSortComparer)
+            .OrderBy(c => double.Parse(c.Number), _chapterSortComparer) // BUG: This is throwing an exception when Range is 1-11
             .FirstOrDefault(chapter => chapter.PagesRead < chapter.Pages && chapter.PagesRead > 0);
         if (currentlyReadingChapter != null) return currentlyReadingChapter;
 

API/Services/SeriesService.cs

@@ -466,10 +466,14 @@ public class SeriesService : ISeriesService
                 if (string.IsNullOrEmpty(title)) return;
                 volume.Name += $" - {title}";
             }
-            else
+            else if (volume.Name != "0")
             {
                 volume.Name += $" - {firstChapter.TitleName}";
             }
+            else
+            {
+                volume.Name += $"";
+            }
 
             return;
         }