// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
namespace System.IO
{
    internal static partial class FileSystem
    {
        internal const UnixFileMode ValidUnixFileModes =
            UnixFileMode.UserRead |
            UnixFileMode.UserWrite |
            UnixFileMode.UserExecute |
            UnixFileMode.GroupRead |
            UnixFileMode.GroupWrite |
            UnixFileMode.GroupExecute |
            UnixFileMode.OtherRead |
            UnixFileMode.OtherWrite |
            UnixFileMode.OtherExecute |
            UnixFileMode.StickyBit |
            UnixFileMode.SetGroup |
            UnixFileMode.SetUser;
 
        internal static void VerifyValidPath(string path, string argName)
        {
            ArgumentException.ThrowIfNullOrEmpty(path, argName);
            if (path.Contains('\0'))
            {
                throw new ArgumentException(SR.Argument_NullCharInPath, argName);
            }
        }
 
        internal static void MoveDirectory(string sourceFullPath, string destFullPath)
        {
            ReadOnlySpan<char> srcNoDirectorySeparator = Path.TrimEndingDirectorySeparator(sourceFullPath.AsSpan());
            ReadOnlySpan<char> destNoDirectorySeparator = Path.TrimEndingDirectorySeparator(destFullPath.AsSpan());
 
            // Don't allow the same path, except for changing the casing of the filename.
            bool isCaseSensitiveRename = false;
            if (srcNoDirectorySeparator.Equals(destNoDirectorySeparator, PathInternal.StringComparison))
            {
                if (PathInternal.IsCaseSensitive || // FileNames will be equal because paths are equal.
                    Path.GetFileName(srcNoDirectorySeparator).SequenceEqual(Path.GetFileName(destNoDirectorySeparator)))
                {
                    throw new IOException(SR.IO_SourceDestMustBeDifferent);
                }
                isCaseSensitiveRename = true;
            }
 
            MoveDirectory(sourceFullPath, destFullPath, isCaseSensitiveRename);
        }
    }
}