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using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using System.Xml;
using System.Xml.Linq;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.IO;
using Microsoft.Extensions.Logging;
namespace MediaBrowser.Providers.Books.ComicInfo;
/// <summary>
/// Handles metadata for comics which is saved as an XML document. This XML document is not part
/// of the comic itself but an external file.
/// </summary>
public class ExternalComicInfoProvider : IComicProvider
{
private readonly IFileSystem _fileSystem;
private readonly ILogger<ExternalComicInfoProvider> _logger;
/// <summary>
/// Initializes a new instance of the <see cref="ExternalComicInfoProvider"/> class.
/// </summary>
/// <param name="fileSystem">Instance of the <see cref="IFileSystem"/> interface.</param>
/// <param name="logger">Instance of the <see cref="ILogger{ExternalComicInfoProvider}"/> interface.</param>
public ExternalComicInfoProvider(IFileSystem fileSystem, ILogger<ExternalComicInfoProvider> logger)
{
_logger = logger;
_fileSystem = fileSystem;
}
/// <inheritdoc />
public async ValueTask<MetadataResult<Book>> ReadMetadata(ItemInfo info, IDirectoryService directoryService, CancellationToken cancellationToken)
{
var comicInfoXml = await LoadXml(info, cancellationToken).ConfigureAwait(false);
if (comicInfoXml is null)
{
_logger.LogInformation("Could not load ComicInfo metadata for {Path} from XML file.", info.Path);
return new MetadataResult<Book> { HasMetadata = false };
}
var book = ComicInfoReader.ReadComicBookMetadata(comicInfoXml);
if (book is null)
{
return new MetadataResult<Book> { HasMetadata = false };
}
var metadataResult = new MetadataResult<Book> { Item = book, HasMetadata = true };
ComicInfoReader.ReadPeopleMetadata(comicInfoXml, metadataResult);
ComicInfoReader.ReadCultureInfoInto(comicInfoXml, "ComicInfo/LanguageISO", cultureInfo => metadataResult.ResultLanguage = cultureInfo.ThreeLetterISOLanguageName);
return metadataResult;
}
/// <inheritdoc />
public bool HasItemChanged(BaseItem item)
{
var file = GetXmlFilePath(item.Path);
return file.Exists && _fileSystem.GetLastWriteTimeUtc(file) > item.DateLastSaved;
}
private async Task<XDocument?> LoadXml(ItemInfo info, CancellationToken cancellationToken)
{
var path = GetXmlFilePath(info.Path).FullName;
if (path is null)
{
return null;
}
try
{
using var reader = XmlReader.Create(path, new XmlReaderSettings { Async = true });
var comicInfoXml = XDocument.LoadAsync(reader, LoadOptions.None, cancellationToken);
return await comicInfoXml.ConfigureAwait(false);
}
catch (Exception e)
{
_logger.LogInformation(e, "Could not load external XML from {Path}. This could mean there is no separate ComicInfo metadata file for this comic or the metadata is bundled within the comic.", path);
return null;
}
}
private FileSystemMetadata GetXmlFilePath(string path)
{
var fileInfo = _fileSystem.GetFileSystemInfo(path);
var directoryInfo = fileInfo.IsDirectory ? fileInfo : _fileSystem.GetDirectoryInfo(Path.GetDirectoryName(path)!);
var file = _fileSystem.GetFileInfo(Path.Combine(directoryInfo.FullName, Path.GetFileNameWithoutExtension(path) + ".xml"));
return file.Exists ? file : _fileSystem.GetFileInfo(Path.Combine(directoryInfo.FullName, ComicInfoReader.ComicRackMetaFile));
}
}
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