// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System.IO;
using Microsoft.Build.Framework;
using Microsoft.Build.Internal;

namespace Microsoft.Build.BackEnd;

internal static class NamedPipeUtil
{
    internal static string GetPlatformSpecificPipeName(int? processId = null)
    {
        processId ??= EnvironmentUtilities.CurrentProcessId;

        string pipeName = $"MSBuild{processId}";

        return GetPlatformSpecificPipeName(pipeName);
    }

    internal static string GetPlatformSpecificPipeName(string pipeName)
    {
        if (NativeMethods.IsUnixLike)
        {
            // If we're on a Unix machine then named pipes are implemented using Unix Domain Sockets.
            // Most Unix systems have a maximum path length limit for Unix Domain Sockets, with
            // Mac having a particularly short one. Mac also has a generated temp directory that
            // can be quite long, leaving very little room for the actual pipe name. Fortunately,
            // '/tmp' is mandated by POSIX to always be a valid temp directory, so we can use that
            // instead.
            return Path.Combine("/tmp", pipeName);
        }
        else
        {
            return pipeName;
        }
    }

    internal static string GetRarNodePipeName(ServerNodeHandshake handshake)
        => GetPlatformSpecificPipeName($"MSBuildRarNode-{handshake.ComputeHash()}");

    internal static string GetRarNodeEndpointPipeName(ServerNodeHandshake handshake)
        => GetPlatformSpecificPipeName($"MSBuildRarNodeEndpoint-{handshake.ComputeHash()}");
}