using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
using Emby.Naming.Common;
using MediaBrowser.Model.IO;
namespace Emby.Naming.Video
{
///
/// Resolves alternative versions and extras from list of video files.
///
public static class VideoListResolver
{
///
/// Resolves alternative versions and extras from list of video files.
///
/// List of related video files.
/// The naming options.
/// Indication we should consider multi-versions of content.
/// Whether to parse the name or use the filename.
/// Returns enumerable of which groups files together when related.
public static IReadOnlyList Resolve(IReadOnlyList 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 == null)
.Select(i => new FileSystemMetadata { FullName = i.Path, IsDirectory = i.IsDirectory });
var stackResult = StackResolver.Resolve(nonExtras, namingOptions).ToList();
var remainingFiles = new List();
var standaloneMedia = new List();
for (var i = 0; i < videoInfos.Count; i++)
{
var current = videoInfos[i];
if (stackResult.Any(s => s.ContainsFile(current.Path, current.IsDirectory)))
{
continue;
}
remainingFiles.Add(current);
if (current.ExtraType == null)
{
standaloneMedia.Add(current);
}
}
var list = new List();
foreach (var stack in stackResult)
{
var info = new VideoInfo(stack.Name)
{
Files = stack.Files.Select(i => VideoResolver.Resolve(i, stack.IsDirectoryStack, namingOptions, parseName))
.OfType()
.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;
remainingFiles.Remove(media);
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 GetVideosGroupedByVersion(List 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]
for (var i = 0; i < videos.Count; i++)
{
var video = videos[i];
if (video.ExtraType != null)
{
continue;
}
if (!IsEligibleForMultiVersion(folderName, video.Files[0].Path, namingOptions))
{
return videos;
}
}
// The list is created and overwritten in the caller, so we are allowed to do in-place sorting
videos.Sort((x, y) => string.Compare(x.Name, y.Name, StringComparison.Ordinal));
var list = new List
{
videos[0]
};
var alternateVersionsLen = videos.Count - 1;
var alternateVersions = new VideoFileInfo[alternateVersionsLen];
for (int i = 0; i < alternateVersionsLen; i++)
{
var video = videos[i + 1];
alternateVersions[i] = video.Files[0];
}
list[0].AlternateVersions = alternateVersions;
list[0].Name = folderName.ToString();
return list;
}
private static bool HaveSameYear(IReadOnlyList 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 folderName, string testFilePath, NamingOptions namingOptions)
{
var testFilename = Path.GetFileNameWithoutExtension(testFilePath.AsSpan());
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
var tmpTestFilename = testFilename.ToString();
if (CleanStringParser.TryClean(tmpTestFilename, namingOptions.CleanStringRegexes, out var cleanName))
{
tmpTestFilename = cleanName.Trim();
}
// The CleanStringParser should have removed common keywords etc.
return string.IsNullOrEmpty(tmpTestFilename)
|| testFilename[0] == '-'
|| Regex.IsMatch(tmpTestFilename, @"^\[([^]]*)\]", RegexOptions.Compiled);
}
}
}