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using System;
using System.IO;
using System.Text.RegularExpressions;
using Emby.Naming.Audio;
using Emby.Naming.Common;
namespace Emby.Naming.Video
{
/// <summary>
/// Resolve if file is extra for video.
/// </summary>
public static class ExtraRuleResolver
{
private static readonly char[] _digits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };
/// <summary>
/// Attempts to resolve if file is extra.
/// </summary>
/// <param name="path">Path to file.</param>
/// <param name="namingOptions">The naming options.</param>
/// <param name="libraryRoot">Top-level folder for the containing library.</param>
/// <returns>Returns <see cref="ExtraResult"/> object.</returns>
public static ExtraResult GetExtraInfo(string path, NamingOptions namingOptions, string? libraryRoot = "")
{
ExtraResult result = new ExtraResult();
bool isAudioFile = AudioFileParser.IsAudioFile(path, namingOptions);
bool isVideoFile = VideoResolver.IsVideoFile(path, namingOptions);
ReadOnlySpan<char> pathSpan = path.AsSpan();
ReadOnlySpan<char> fileName = Path.GetFileName(pathSpan);
ReadOnlySpan<char> fileNameWithoutExtension = Path.GetFileNameWithoutExtension(pathSpan);
// Trim the digits from the end of the filename so we can recognize things like -trailer2
ReadOnlySpan<char> trimmedFileNameWithoutExtension = fileNameWithoutExtension.TrimEnd(_digits);
ReadOnlySpan<char> directoryName = Path.GetFileName(Path.GetDirectoryName(pathSpan));
string fullDirectory = Path.GetDirectoryName(pathSpan).ToString();
foreach (ExtraRule rule in namingOptions.VideoExtraRules)
{
if ((rule.MediaType == MediaType.Audio && !isAudioFile)
|| (rule.MediaType == MediaType.Video && !isVideoFile))
{
continue;
}
bool isMatch = rule.RuleType switch
{
ExtraRuleType.Filename => fileNameWithoutExtension.Equals(rule.Token, StringComparison.OrdinalIgnoreCase),
ExtraRuleType.Suffix => trimmedFileNameWithoutExtension.EndsWith(rule.Token, StringComparison.OrdinalIgnoreCase),
ExtraRuleType.Regex => Regex.IsMatch(fileName, rule.Token, RegexOptions.IgnoreCase | RegexOptions.Compiled),
ExtraRuleType.DirectoryName => directoryName.Equals(rule.Token, StringComparison.OrdinalIgnoreCase)
&& !string.Equals(fullDirectory, libraryRoot, StringComparison.OrdinalIgnoreCase),
_ => false,
};
if (!isMatch)
{
continue;
}
result.ExtraType = rule.ExtraType;
result.Rule = rule;
return result;
}
return result;
}
}
}
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