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using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Jellyfin.Server.ServerSetupApp;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Library;
using MediaBrowser.Model.Globalization;
using Microsoft.Extensions.Logging;
namespace Jellyfin.Server.Migrations.Routines;
/// <summary>
/// Migration to fix broken library subtitle download languages.
/// </summary>
[JellyfinMigration("2026-02-06T20:00:00", nameof(FixLibrarySubtitleDownloadLanguages))]
internal class FixLibrarySubtitleDownloadLanguages : IAsyncMigrationRoutine
{
private readonly ILocalizationManager _localizationManager;
private readonly ILibraryManager _libraryManager;
private readonly ILogger _logger;
/// <summary>
/// Initializes a new instance of the <see cref="FixLibrarySubtitleDownloadLanguages"/> class.
/// </summary>
/// <param name="localizationManager">The Localization manager.</param>
/// <param name="startupLogger">The startup logger for Startup UI integration.</param>
/// <param name="libraryManager">The Library manager.</param>
/// <param name="logger">The logger.</param>
public FixLibrarySubtitleDownloadLanguages(
ILocalizationManager localizationManager,
IStartupLogger<FixLibrarySubtitleDownloadLanguages> startupLogger,
ILibraryManager libraryManager,
ILogger<FixLibrarySubtitleDownloadLanguages> logger)
{
_localizationManager = localizationManager;
_libraryManager = libraryManager;
_logger = startupLogger.With(logger);
}
/// <inheritdoc />
public Task PerformAsync(CancellationToken cancellationToken)
{
_logger.LogInformation("Starting to fix library subtitle download languages.");
var virtualFolders = _libraryManager.GetVirtualFolders(false);
foreach (var virtualFolder in virtualFolders)
{
var options = virtualFolder.LibraryOptions;
if (options?.SubtitleDownloadLanguages is null || options.SubtitleDownloadLanguages.Length == 0)
{
continue;
}
// Some virtual folders don't have a proper item id.
if (!Guid.TryParse(virtualFolder.ItemId, out var folderId))
{
continue;
}
var collectionFolder = _libraryManager.GetItemById<CollectionFolder>(folderId);
if (collectionFolder is null)
{
_logger.LogWarning("Could not find collection folder for virtual folder '{LibraryName}' with id '{FolderId}'. Skipping.", virtualFolder.Name, folderId);
continue;
}
var fixedLanguages = new List<string>();
foreach (var language in options.SubtitleDownloadLanguages)
{
var foundLanguage = _localizationManager.FindLanguageInfo(language)?.ThreeLetterISOLanguageName;
if (foundLanguage is not null)
{
// Converted ISO 639-2/B to T (ger to deu)
if (!string.Equals(foundLanguage, language, StringComparison.OrdinalIgnoreCase))
{
_logger.LogInformation("Converted '{Language}' to '{ResolvedLanguage}' in library '{LibraryName}'.", language, foundLanguage, virtualFolder.Name);
}
if (fixedLanguages.Contains(foundLanguage, StringComparer.OrdinalIgnoreCase))
{
_logger.LogInformation("Language '{Language}' already exists for library '{LibraryName}'. Skipping duplicate.", foundLanguage, virtualFolder.Name);
continue;
}
fixedLanguages.Add(foundLanguage);
}
else
{
_logger.LogInformation("Could not resolve language '{Language}' in library '{LibraryName}'. Skipping.", language, virtualFolder.Name);
}
}
options.SubtitleDownloadLanguages = [.. fixedLanguages];
collectionFolder.UpdateLibraryOptions(options);
}
_logger.LogInformation("Library subtitle download languages fixed.");
return Task.CompletedTask;
}
}
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