// 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 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!;
    }
}