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305 lines
12 KiB
C#
305 lines
12 KiB
C#
using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Text.RegularExpressions;
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using Emby.Naming.Common;
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using MediaBrowser.Model.Entities;
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using MediaBrowser.Model.IO;
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namespace Emby.Naming.Video
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{
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/// <summary>
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/// Resolves alternative versions and extras from list of video files.
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/// </summary>
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public static class VideoListResolver
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{
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/// <summary>
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/// Resolves alternative versions and extras from list of video files.
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/// </summary>
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/// <param name="files">List of related video files.</param>
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/// <param name="namingOptions">The naming options.</param>
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/// <param name="supportMultiVersion">Indication we should consider multi-versions of content.</param>
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/// <returns>Returns enumerable of <see cref="VideoInfo"/> which groups files together when related.</returns>
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public static IEnumerable<VideoInfo> Resolve(IEnumerable<FileSystemMetadata> files, NamingOptions namingOptions, bool supportMultiVersion = true)
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{
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var videoInfos = files
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.Select(i => VideoResolver.Resolve(i.FullName, i.IsDirectory, namingOptions))
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.OfType<VideoFileInfo>()
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.ToList();
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// Filter out all extras, otherwise they could cause stacks to not be resolved
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// See the unit test TestStackedWithTrailer
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var nonExtras = videoInfos
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.Where(i => i.ExtraType == null)
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.Select(i => new FileSystemMetadata { FullName = i.Path, IsDirectory = i.IsDirectory });
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var stackResult = new StackResolver(namingOptions)
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.Resolve(nonExtras).ToList();
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var remainingFiles = videoInfos
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.Where(i => !stackResult.Any(s => i.Path != null && s.ContainsFile(i.Path, i.IsDirectory)))
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.ToList();
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var list = new List<VideoInfo>();
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foreach (var stack in stackResult)
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{
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var info = new VideoInfo(stack.Name)
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{
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Files = stack.Files.Select(i => VideoResolver.Resolve(i, stack.IsDirectoryStack, namingOptions))
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.OfType<VideoFileInfo>()
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.ToList()
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};
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info.Year = info.Files[0].Year;
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var extras = ExtractExtras(remainingFiles, stack.Name, Path.GetFileNameWithoutExtension(stack.Files[0].AsSpan()), namingOptions.VideoFlagDelimiters);
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if (extras.Count > 0)
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{
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info.Extras = extras;
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}
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list.Add(info);
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}
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var standaloneMedia = remainingFiles
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.Where(i => i.ExtraType == null)
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.ToList();
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foreach (var media in standaloneMedia)
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{
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var info = new VideoInfo(media.Name) { Files = new[] { media } };
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info.Year = info.Files[0].Year;
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remainingFiles.Remove(media);
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var extras = ExtractExtras(remainingFiles, media.FileNameWithoutExtension, namingOptions.VideoFlagDelimiters);
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info.Extras = extras;
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list.Add(info);
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}
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if (supportMultiVersion)
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{
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list = GetVideosGroupedByVersion(list, namingOptions);
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}
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// If there's only one resolved video, use the folder name as well to find extras
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if (list.Count == 1)
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{
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var info = list[0];
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var videoPath = list[0].Files[0].Path;
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var parentPath = Path.GetDirectoryName(videoPath.AsSpan());
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if (!parentPath.IsEmpty)
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{
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var folderName = Path.GetFileName(parentPath);
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if (!folderName.IsEmpty)
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{
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var extras = ExtractExtras(remainingFiles, folderName, namingOptions.VideoFlagDelimiters);
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extras.AddRange(info.Extras);
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info.Extras = extras;
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}
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}
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// Add the extras that are just based on file name as well
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var extrasByFileName = remainingFiles
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.Where(i => i.ExtraRule != null && i.ExtraRule.RuleType == ExtraRuleType.Filename)
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.ToList();
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remainingFiles = remainingFiles
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.Except(extrasByFileName)
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.ToList();
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extrasByFileName.AddRange(info.Extras);
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info.Extras = extrasByFileName;
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}
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// If there's only one video, accept all trailers
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// Be lenient because people use all kinds of mishmash conventions with trailers.
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if (list.Count == 1)
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{
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var trailers = remainingFiles
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.Where(i => i.ExtraType == ExtraType.Trailer)
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.ToList();
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trailers.AddRange(list[0].Extras);
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list[0].Extras = trailers;
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remainingFiles = remainingFiles
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.Except(trailers)
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.ToList();
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}
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// Whatever files are left, just add them
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list.AddRange(remainingFiles.Select(i => new VideoInfo(i.Name)
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{
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Files = new[] { i },
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Year = i.Year
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}));
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return list;
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}
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private static List<VideoInfo> GetVideosGroupedByVersion(List<VideoInfo> videos, NamingOptions namingOptions)
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{
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if (videos.Count == 0)
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{
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return videos;
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}
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var folderName = Path.GetFileName(Path.GetDirectoryName(videos[0].Files[0].Path.AsSpan()));
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if (folderName.Length <= 1 || !HaveSameYear(videos))
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{
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return videos;
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}
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// Cannot use Span inside local functions and delegates thus we cannot use LINQ here nor merge with the above [if]
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for (var i = 0; i < videos.Count; i++)
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{
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var video = videos[i];
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if (!IsEligibleForMultiVersion(folderName, video.Files[0].Path, namingOptions))
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{
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return videos;
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}
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}
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// The list is created and overwritten in the caller, so we are allowed to do in-place sorting
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videos.Sort((x, y) => string.Compare(x.Name, y.Name, StringComparison.Ordinal));
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var list = new List<VideoInfo>
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{
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videos[0]
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};
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var alternateVersionsLen = videos.Count - 1;
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var alternateVersions = new VideoFileInfo[alternateVersionsLen];
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var extras = new List<VideoFileInfo>(list[0].Extras);
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for (int i = 0; i < alternateVersionsLen; i++)
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{
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var video = videos[i + 1];
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alternateVersions[i] = video.Files[0];
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extras.AddRange(video.Extras);
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}
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list[0].AlternateVersions = alternateVersions;
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list[0].Name = folderName.ToString();
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list[0].Extras = extras;
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return list;
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}
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private static bool HaveSameYear(IReadOnlyList<VideoInfo> videos)
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{
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if (videos.Count == 1)
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{
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return true;
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}
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var firstYear = videos[0].Year ?? -1;
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for (var i = 1; i < videos.Count; i++)
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{
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if ((videos[i].Year ?? -1) != firstYear)
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{
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return false;
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}
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}
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return true;
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}
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private static bool IsEligibleForMultiVersion(ReadOnlySpan<char> folderName, string testFilePath, NamingOptions namingOptions)
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{
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var testFilename = Path.GetFileNameWithoutExtension(testFilePath.AsSpan());
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if (!testFilename.StartsWith(folderName, StringComparison.OrdinalIgnoreCase))
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{
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return false;
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}
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// Remove the folder name before cleaning as we don't care about cleaning that part
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if (folderName.Length <= testFilename.Length)
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{
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testFilename = testFilename[folderName.Length..].Trim();
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}
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// There are no span overloads for regex unfortunately
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var tmpTestFilename = testFilename.ToString();
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if (CleanStringParser.TryClean(tmpTestFilename, namingOptions.CleanStringRegexes, out var cleanName))
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{
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tmpTestFilename = cleanName.Trim().ToString();
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}
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// The CleanStringParser should have removed common keywords etc.
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return string.IsNullOrEmpty(tmpTestFilename)
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|| testFilename[0] == '-'
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|| Regex.IsMatch(tmpTestFilename, @"^\[([^]]*)\]", RegexOptions.Compiled);
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}
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private static ReadOnlySpan<char> TrimFilenameDelimiters(ReadOnlySpan<char> name, ReadOnlySpan<char> videoFlagDelimiters)
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{
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return name.IsEmpty ? name : name.TrimEnd().TrimEnd(videoFlagDelimiters).TrimEnd();
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}
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private static bool StartsWith(ReadOnlySpan<char> fileName, ReadOnlySpan<char> baseName, ReadOnlySpan<char> trimmedBaseName)
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{
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if (baseName.IsEmpty)
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{
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return false;
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}
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return fileName.StartsWith(baseName, StringComparison.OrdinalIgnoreCase)
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|| (!trimmedBaseName.IsEmpty && fileName.StartsWith(trimmedBaseName, StringComparison.OrdinalIgnoreCase));
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}
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/// <summary>
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/// Finds similar filenames to that of [baseName] and removes any matches from [remainingFiles].
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/// </summary>
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/// <param name="remainingFiles">The list of remaining filenames.</param>
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/// <param name="baseName">The base name to use for the comparison.</param>
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/// <param name="videoFlagDelimiters">The video flag delimiters.</param>
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/// <returns>A list of video extras for [baseName].</returns>
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private static List<VideoFileInfo> ExtractExtras(IList<VideoFileInfo> remainingFiles, ReadOnlySpan<char> baseName, ReadOnlySpan<char> videoFlagDelimiters)
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{
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return ExtractExtras(remainingFiles, baseName, ReadOnlySpan<char>.Empty, videoFlagDelimiters);
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}
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/// <summary>
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/// Finds similar filenames to that of [firstBaseName] and [secondBaseName] and removes any matches from [remainingFiles].
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/// </summary>
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/// <param name="remainingFiles">The list of remaining filenames.</param>
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/// <param name="firstBaseName">The first base name to use for the comparison.</param>
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/// <param name="secondBaseName">The second base name to use for the comparison.</param>
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/// <param name="videoFlagDelimiters">The video flag delimiters.</param>
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/// <returns>A list of video extras for [firstBaseName] and [secondBaseName].</returns>
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private static List<VideoFileInfo> ExtractExtras(IList<VideoFileInfo> remainingFiles, ReadOnlySpan<char> firstBaseName, ReadOnlySpan<char> secondBaseName, ReadOnlySpan<char> videoFlagDelimiters)
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{
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var trimmedFirstBaseName = TrimFilenameDelimiters(firstBaseName, videoFlagDelimiters);
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var trimmedSecondBaseName = TrimFilenameDelimiters(secondBaseName, videoFlagDelimiters);
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var result = new List<VideoFileInfo>();
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for (var pos = remainingFiles.Count - 1; pos >= 0; pos--)
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{
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var file = remainingFiles[pos];
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if (file.ExtraType == null)
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{
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continue;
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}
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var filename = file.FileNameWithoutExtension;
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if (StartsWith(filename, firstBaseName, trimmedFirstBaseName)
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|| StartsWith(filename, secondBaseName, trimmedSecondBaseName))
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{
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result.Add(file);
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remainingFiles.RemoveAt(pos);
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}
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}
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return result;
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}
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}
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}
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