// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.

namespace WixToolset.Core.Native
{
    using System;
    using System.IO;
    using System.Runtime.InteropServices;

    /// <summary>
    /// File system helpers.
    /// </summary>
    public static class FileSystem
    {
        /// <summary>
        /// Copies a file.
        /// </summary>
        /// <param name="source">The file to copy.</param>
        /// <param name="destination">The destination file.</param>
        /// <param name="allowHardlink">Allow hardlinks.</param>
        public static void CopyFile(string source, string destination, bool allowHardlink)
        {
            if (File.Exists(destination))
            {
                File.Delete(destination);
            }

            if (!allowHardlink || !CreateHardLink(destination, source, IntPtr.Zero))
            {
#if DEBUG
                var er = Marshal.GetLastWin32Error();
#endif

                File.Copy(source, destination, overwrite: true);
            }
        }

        /// <summary>
        /// Moves a file.
        /// </summary>
        /// <param name="source">The file to move.</param>
        /// <param name="destination">The destination file.</param>
        public static void MoveFile(string source, string destination)
        {
            if (File.Exists(destination))
            {
                File.Delete(destination);
            }

            var directory = Path.GetDirectoryName(destination);
            if (!String.IsNullOrEmpty(directory))
            {
                Directory.CreateDirectory(directory);
            }

            File.Move(source, destination);
        }

        [DllImport("Kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
        private static extern bool CreateHardLink(string lpFileName, string lpExistingFileName, IntPtr lpSecurityAttributes);
    }
}