////////////////////////////////////////////////////////////////////////////////
//
//  Microsoft Research Singularity
//
//  Copyright (c) Microsoft Corporation.  All rights reserved.
//
//  File:   PathUtils.sg
//
//  Note:
//

using System;
using System.Threading;
using Microsoft.Singularity;
using Microsoft.Singularity.Directory;
using Microsoft.Singularity.Channels;
using Microsoft.Singularity.FileSystem;
using Microsoft.Singularity.V1.Services;

namespace FileSystem.Utils
{
    public class PathUtils
    {
        internal static string FileFromPath(string! filePath)
        {
            string dirPath, fileName;
            SplitPath(filePath, out dirPath, out fileName);
            return fileName;
        }

        // Splits a file path into its directory and filename
        // components
        internal static void SplitPath(string! filePath,
                                       out string dirPath,
                                       out string fileName)
        {
            dirPath = String.Empty;
            fileName = String.Empty;

            string[]! parts = filePath.Split('/');
            if ((parts == null) || (parts.Length <= 1)) {
                // Not even a leading slash? Bah!
                return;
            }

            fileName = (!)parts[parts.Length-1];

            // The directory path is the full path minus
            // the trailing leaf part
            // need to special case Directory Service root. Need to return "/" as dirPath
            int len = (filePath.Length - fileName.Length - 1) > 0? filePath.Length - fileName.Length - 1 : 1; 
            dirPath = filePath.Substring(0, len);
        }
    }
}