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using System.Globalization;
using System.IO;
using System.Text.RegularExpressions;
using Emby.Naming.Common;
namespace Emby.Naming.AudioBook
{
/// <summary>
/// Parser class to extract part and/or chapter number from audiobook filename.
/// </summary>
public class AudioBookFilePathParser
{
private readonly NamingOptions _options;
/// <summary>
/// Initializes a new instance of the <see cref="AudioBookFilePathParser"/> class.
/// </summary>
/// <param name="options">Naming options containing AudioBookPartsExpressions.</param>
public AudioBookFilePathParser(NamingOptions options)
{
_options = options;
}
/// <summary>
/// Based on regex determines if filename includes part/chapter number.
/// </summary>
/// <param name="path">Path to audiobook file.</param>
/// <returns>Returns <see cref="AudioBookFilePathParser"/> object.</returns>
public AudioBookFilePathParserResult Parse(string path)
{
AudioBookFilePathParserResult result = default;
var fileName = Path.GetFileNameWithoutExtension(path);
foreach (var expression in _options.AudioBookPartsExpressions)
{
var match = Regex.Match(fileName, expression, RegexOptions.IgnoreCase);
if (match.Success)
{
if (!result.ChapterNumber.HasValue)
{
var value = match.Groups["chapter"];
if (value.Success)
{
if (int.TryParse(value.ValueSpan, NumberStyles.Integer, CultureInfo.InvariantCulture, out var intValue))
{
result.ChapterNumber = intValue;
}
}
}
if (!result.PartNumber.HasValue)
{
var value = match.Groups["part"];
if (value.Success)
{
if (int.TryParse(value.ValueSpan, NumberStyles.Integer, CultureInfo.InvariantCulture, out var intValue))
{
result.PartNumber = intValue;
}
}
}
}
}
return result;
}
}
}
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