using System.Text;
using System.Text.RegularExpressions;

namespace MxGateway.Server.Galaxy;

public static class GalaxyGlobMatcher
{
    public static bool IsMatch(string value, string glob)
    {
        if (string.IsNullOrWhiteSpace(glob))
        {
            return true;
        }

        return Regex.IsMatch(
            value ?? string.Empty,
            BuildRegex(glob),
            RegexOptions.CultureInvariant | RegexOptions.IgnoreCase,
            TimeSpan.FromMilliseconds(100));
    }

    private static string BuildRegex(string glob)
    {
        StringBuilder builder = new("^", glob.Length + 2);
        foreach (char character in glob)
        {
            switch (character)
            {
                case '*':
                    builder.Append(".*");
                    break;
                case '?':
                    builder.Append('.');
                    break;
                default:
                    builder.Append(Regex.Escape(character.ToString()));
                    break;
            }
        }

        builder.Append('$');
        return builder.ToString();
    }
}