// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
using System.Threading;
using Roslyn.Test.Utilities;
using Roslyn.Utilities;
 
namespace Microsoft.CodeAnalysis.MSBuild.UnitTests;
 
internal sealed class VisualStudioMSBuildInstalled : ExecutionCondition
{
    private static readonly string? s_skipReason;
 
    static VisualStudioMSBuildInstalled()
    {
        if (!PlatformInformation.IsWindows)
        {
            s_skipReason = "Test is only supported on Windows since it looks for a Visual Studio install.";
        }
        else if (!IsVisualStudioMSBuildInstalled())
        {
            s_skipReason = "No usable Visual Studio is installed.";
        }
    }
 
    private static bool IsVisualStudioMSBuildInstalled()
    {
        BuildHostProcessManager? buildHostProcessManager = null;
 
        try
        {
            buildHostProcessManager = new BuildHostProcessManager();
 
            var buildHost = buildHostProcessManager.GetBuildHostAsync(BuildHostProcessManager.BuildHostProcessKind.NetFramework, CancellationToken.None).Result;
 
            // HACK: for .NET Framework build hosts, we don't actually need the project path to determine whether there's a usable VS -- so we can pass any file name here.
            return buildHost.HasUsableMSBuildAsync("NonExistent.sln", CancellationToken.None).Result;
        }
        finally
        {
            buildHostProcessManager?.DisposeAsync().AsTask().Wait();
        }
    }
 
    public override bool ShouldSkip
        => s_skipReason is not null;
 
    public override string SkipReason
        => s_skipReason!;
}