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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
using Emby.Naming.Common;
using Jellyfin.Extensions;
using MediaBrowser.Model.IO;
namespace Emby.Naming.Video
{
/// <summary>
/// Resolves alternative versions and extras from list of video files.
/// </summary>
public static partial class VideoListResolver
{
[GeneratedRegex("[0-9]{2}[0-9]+[ip]", RegexOptions.IgnoreCase)]
private static partial Regex ResolutionRegex();
[GeneratedRegex(@"^\[([^]]*)\]")]
private static partial Regex CheckMultiVersionRegex();
/// <summary>
/// Resolves alternative versions and extras from list of video files.
/// </summary>
/// <param name="videoInfos">List of related video files.</param>
/// <param name="namingOptions">The naming options.</param>
/// <param name="supportMultiVersion">Indication we should consider multi-versions of content.</param>
/// <param name="parseName">Whether to parse the name or use the filename.</param>
/// <returns>Returns enumerable of <see cref="VideoInfo"/> which groups files together when related.</returns>
public static IReadOnlyList<VideoInfo> Resolve(IReadOnlyList<VideoFileInfo> videoInfos, NamingOptions namingOptions, bool supportMultiVersion = true, bool parseName = true)
{
// Filter out all extras, otherwise they could cause stacks to not be resolved
// See the unit test TestStackedWithTrailer
var nonExtras = videoInfos
.Where(i => i.ExtraType is null)
.Select(i => new FileSystemMetadata { FullName = i.Path, IsDirectory = i.IsDirectory });
var stackResult = StackResolver.Resolve(nonExtras, namingOptions).ToList();
var remainingFiles = new List<VideoFileInfo>();
var standaloneMedia = new List<VideoFileInfo>();
for (var i = 0; i < videoInfos.Count; i++)
{
var current = videoInfos[i];
if (stackResult.Any(s => s.ContainsFile(current.Path, current.IsDirectory)))
{
continue;
}
if (current.ExtraType is null)
{
standaloneMedia.Add(current);
}
else
{
remainingFiles.Add(current);
}
}
var list = new List<VideoInfo>();
foreach (var stack in stackResult)
{
var info = new VideoInfo(stack.Name)
{
Files = stack.Files.Select(i => VideoResolver.Resolve(i, stack.IsDirectoryStack, namingOptions, parseName))
.OfType<VideoFileInfo>()
.ToList()
};
info.Year = info.Files[0].Year;
list.Add(info);
}
foreach (var media in standaloneMedia)
{
var info = new VideoInfo(media.Name) { Files = new[] { media } };
info.Year = info.Files[0].Year;
list.Add(info);
}
if (supportMultiVersion)
{
list = GetVideosGroupedByVersion(list, namingOptions);
}
// Whatever files are left, just add them
list.AddRange(remainingFiles.Select(i => new VideoInfo(i.Name)
{
Files = new[] { i },
Year = i.Year,
ExtraType = i.ExtraType
}));
return list;
}
private static List<VideoInfo> GetVideosGroupedByVersion(List<VideoInfo> videos, NamingOptions namingOptions)
{
if (videos.Count == 0)
{
return videos;
}
var folderName = Path.GetFileName(Path.GetDirectoryName(videos[0].Files[0].Path.AsSpan()));
if (folderName.Length <= 1 || !HaveSameYear(videos))
{
return videos;
}
// Cannot use Span inside local functions and delegates thus we cannot use LINQ here nor merge with the above [if]
VideoInfo? primary = null;
for (var i = 0; i < videos.Count; i++)
{
var video = videos[i];
if (video.ExtraType is not null)
{
continue;
}
if (!IsEligibleForMultiVersion(folderName, video.Files[0].FileNameWithoutExtension, namingOptions))
{
return videos;
}
if (folderName.Equals(video.Files[0].FileNameWithoutExtension, StringComparison.Ordinal))
{
primary = video;
}
}
if (videos.Count > 1)
{
var groups = videos.GroupBy(x => ResolutionRegex().IsMatch(x.Files[0].FileNameWithoutExtension)).ToList();
videos.Clear();
foreach (var group in groups)
{
if (group.Key)
{
videos.InsertRange(0, group
.OrderByDescending(x => ResolutionRegex().Match(x.Files[0].FileNameWithoutExtension.ToString()).Value, new AlphanumericComparator())
.ThenBy(x => x.Files[0].FileNameWithoutExtension.ToString(), new AlphanumericComparator()));
}
else
{
videos.AddRange(group.OrderBy(x => x.Files[0].FileNameWithoutExtension.ToString(), new AlphanumericComparator()));
}
}
}
primary ??= videos[0];
videos.Remove(primary);
var list = new List<VideoInfo>
{
primary
};
list[0].AlternateVersions = videos.Select(x => x.Files[0]).ToArray();
list[0].Name = folderName.ToString();
return list;
}
private static bool HaveSameYear(IReadOnlyList<VideoInfo> videos)
{
if (videos.Count == 1)
{
return true;
}
var firstYear = videos[0].Year ?? -1;
for (var i = 1; i < videos.Count; i++)
{
if ((videos[i].Year ?? -1) != firstYear)
{
return false;
}
}
return true;
}
private static bool IsEligibleForMultiVersion(ReadOnlySpan<char> folderName, ReadOnlySpan<char> testFilename, NamingOptions namingOptions)
{
if (!testFilename.StartsWith(folderName, StringComparison.OrdinalIgnoreCase))
{
return false;
}
// Remove the folder name before cleaning as we don't care about cleaning that part
if (folderName.Length <= testFilename.Length)
{
testFilename = testFilename[folderName.Length..].Trim();
}
// There are no span overloads for regex unfortunately
if (CleanStringParser.TryClean(testFilename.ToString(), namingOptions.CleanStringRegexes, out var cleanName))
{
testFilename = cleanName.AsSpan().Trim();
}
// The CleanStringParser should have removed common keywords etc.
return testFilename.IsEmpty
|| testFilename[0] == '-'
|| CheckMultiVersionRegex().IsMatch(testFilename);
}
}
}
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