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using System;
using System.Globalization;
using System.IO;
using System.Text.RegularExpressions;
namespace Emby.Naming.TV
{
/// <summary>
/// Class to parse season paths.
/// </summary>
public static partial class SeasonPathParser
{
[GeneratedRegex(@"^\s*((?<seasonnumber>(?>\d+))(?:st|nd|rd|th|\.)*(?!\s*[Ee]\d+))\s*(?:[[시즌]*|[シーズン]*|[sS](?:eason|æson|aison|taffel|eries|tagione|äsong|eizoen|easong|ezon|ezona|ezóna|ezonul)*|[tT](?:emporada)*|[kK](?:ausi)*|[Сс](?:езон)*)\s*(?<rightpart>.*)$")]
private static partial Regex ProcessPre();
[GeneratedRegex(@"^\s*(?:[[시즌]*|[シーズン]*|[sS](?:eason|æson|aison|taffel|eries|tagione|äsong|eizoen|easong|ezon|ezona|ezóna|ezonul)*|[tT](?:emporada)*|[kK](?:ausi)*|[Сс](?:езон)*)\s*(?<seasonnumber>(?>\d+)(?!\s*[Ee]\d+))(?<rightpart>.*)$")]
private static partial Regex ProcessPost();
/// <summary>
/// Attempts to parse season number from path.
/// </summary>
/// <param name="path">Path to season.</param>
/// <param name="parentPath">Folder name of the parent.</param>
/// <param name="supportSpecialAliases">Support special aliases when parsing.</param>
/// <param name="supportNumericSeasonFolders">Support numeric season folders when parsing.</param>
/// <returns>Returns <see cref="SeasonPathParserResult"/> object.</returns>
public static SeasonPathParserResult Parse(string path, string? parentPath, bool supportSpecialAliases, bool supportNumericSeasonFolders)
{
var result = new SeasonPathParserResult();
var parentFolderName = parentPath is null ? null : new DirectoryInfo(parentPath).Name;
var (seasonNumber, isSeasonFolder) = GetSeasonNumberFromPath(path, parentFolderName, supportSpecialAliases, supportNumericSeasonFolders);
result.SeasonNumber = seasonNumber;
if (result.SeasonNumber.HasValue)
{
result.Success = true;
result.IsSeasonFolder = isSeasonFolder;
}
return result;
}
/// <summary>
/// Gets the season number from path.
/// </summary>
/// <param name="path">The path.</param>
/// <param name="parentFolderName">The parent folder name.</param>
/// <param name="supportSpecialAliases">if set to <c>true</c> [support special aliases].</param>
/// <param name="supportNumericSeasonFolders">if set to <c>true</c> [support numeric season folders].</param>
/// <returns>System.Nullable{System.Int32}.</returns>
private static (int? SeasonNumber, bool IsSeasonFolder) GetSeasonNumberFromPath(
string path,
string? parentFolderName,
bool supportSpecialAliases,
bool supportNumericSeasonFolders)
{
string filename = Path.GetFileName(path);
filename = Regex.Replace(filename, "[ ._-]", string.Empty);
if (parentFolderName is not null)
{
parentFolderName = Regex.Replace(parentFolderName, "[ ._-]", string.Empty);
filename = filename.Replace(parentFolderName, string.Empty, StringComparison.OrdinalIgnoreCase);
}
if (supportSpecialAliases)
{
if (string.Equals(filename, "specials", StringComparison.OrdinalIgnoreCase))
{
return (0, true);
}
if (string.Equals(filename, "extras", StringComparison.OrdinalIgnoreCase))
{
return (0, true);
}
}
if (supportNumericSeasonFolders)
{
if (int.TryParse(filename, NumberStyles.Integer, CultureInfo.InvariantCulture, out var val))
{
return (val, true);
}
}
if (filename.StartsWith('s'))
{
var testFilename = filename.AsSpan()[1..];
if (int.TryParse(testFilename, NumberStyles.Integer, CultureInfo.InvariantCulture, out var val))
{
return (val, true);
}
}
var preMatch = ProcessPre().Match(filename);
if (preMatch.Success)
{
return CheckMatch(preMatch);
}
else
{
var postMatch = ProcessPost().Match(filename);
return CheckMatch(postMatch);
}
}
private static (int? SeasonNumber, bool IsSeasonFolder) CheckMatch(Match match)
{
var numberString = match.Groups["seasonnumber"];
if (numberString.Success)
{
var seasonNumber = int.Parse(numberString.Value, CultureInfo.InvariantCulture);
return (seasonNumber, true);
}
return (null, false);
}
/// <summary>
/// Extracts the season number from the second half of the Season folder name (everything after "Season", or "Staffel").
/// </summary>
/// <param name="path">The path.</param>
/// <returns>System.Nullable{System.Int32}.</returns>
private static (int? SeasonNumber, bool IsSeasonFolder) GetSeasonNumberFromPathSubstring(ReadOnlySpan<char> path)
{
var numericStart = -1;
var length = 0;
var hasOpenParenthesis = false;
var isSeasonFolder = true;
// Find out where the numbers start, and then keep going until they end
for (var i = 0; i < path.Length; i++)
{
if (char.IsNumber(path[i]))
{
if (!hasOpenParenthesis)
{
if (numericStart == -1)
{
numericStart = i;
}
length++;
}
}
else if (numericStart != -1)
{
// There's other stuff after the season number, e.g. episode number
isSeasonFolder = false;
break;
}
var currentChar = path[i];
if (currentChar == '(')
{
hasOpenParenthesis = true;
}
else if (currentChar == ')')
{
hasOpenParenthesis = false;
}
}
if (numericStart == -1)
{
return (null, isSeasonFolder);
}
return (int.Parse(path.Slice(numericStart, length), provider: CultureInfo.InvariantCulture), isSeasonFolder);
}
}
}
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