namespace SQLLinter.Common.Helpers;

public static class FileHelpers
{
    public static List<string> FindFilesWithMask(List<string> paths)
    {
        return paths.SelectMany(path =>
        {
            var fullPath = Path.GetFullPath(path);
            var directory = Path.GetDirectoryName(fullPath);
            if (directory == null) return Enumerable.Empty<string>();

            string pattern = Path.GetFileName(fullPath);

            // Если маска есть в директории
            if (directory.Contains("*") || directory.Contains("?"))
            {
                var root = Path.GetPathRoot(directory);
                if (root == null) return Enumerable.Empty<string>();

                string relative = directory.Substring(root.Length);

                return ExpandDirectories(root, relative)
                    .SelectMany(dir => Directory.EnumerateFiles(dir, pattern));
            }
            else
            {
                return Directory.Exists(directory)
                    ? Directory.EnumerateFiles(directory, pattern)
                    : Enumerable.Empty<string>();
            }
        }).ToList();
    }

    public static IEnumerable<string> ExpandDirectories(string root, string relative)
    {
        string[] parts = relative.Split(Path.DirectorySeparatorChar);

        IEnumerable<string> dirs = new[] { root };

        foreach (var part in parts)
        {
            dirs = part.Contains("*") || part.Contains("?")
                ? dirs.SelectMany(d => Directory.Exists(d)
                    ? Directory.EnumerateDirectories(d, part)
                    : Enumerable.Empty<string>())
                : dirs.Select(d => Path.Combine(d, part));
        }

        return dirs.Where(Directory.Exists);
    }

}