namespace dy.net.storage
{
    public static class StoragePath
    {
        public static string NormalizeRemote(string path)
        {
            if (string.IsNullOrWhiteSpace(path)) return "/";

            var normalized = path.Replace('\\', '/').Trim();
            var segments = normalized.Split('/', StringSplitOptions.RemoveEmptyEntries);
            if (segments.Any(x => x == "." || x == ".."))
                throw new ArgumentException("远端存储路径不能包含 . 或 ..", nameof(path));

            return "/" + string.Join('/', segments);
        }

        public static string CombineRemote(params string[] parts)
        {
            return NormalizeRemote(string.Join('/', parts.Where(x => !string.IsNullOrWhiteSpace(x))));
        }

        public static string DirectoryName(string path)
        {
            var normalized = NormalizeRemote(path);
            var lastSlash = normalized.LastIndexOf('/');
            return lastSlash <= 0 ? "/" : normalized[..lastSlash];
        }

        public static string Encode(string path)
        {
            var normalized = NormalizeRemote(path);
            return string.Join('/', normalized.Split('/').Select(Uri.EscapeDataString));
        }
    }
}