// 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.IO;
using System.Threading;
using Roslyn.Test.Utilities;
 
namespace Microsoft.CodeAnalysis.MSBuild.UnitTests
{
    internal partial class DotNetSdkMSBuildInstalled : ExecutionCondition
    {
        private static readonly string? s_skipReason;
 
        static DotNetSdkMSBuildInstalled()
        {
            // We'll use the same .NET as we use for our own build, since that's the only SDK guaranteed to be installed
            var solution = Path.Combine(GetSolutionFolder(), "Roslyn.sln");
 
            if (!HasNetCoreSdkForSolution(solution))
            {
                s_skipReason = "No usable .NET SDK could be found.";
            }
 
            static string GetSolutionFolder()
            {
                // Expected assembly path:
                //  <solutionFolder>\artifacts\bin\Microsoft.CodeAnalysis.Workspaces.MSBuild.UnitTests\<Configuration>\<TFM>\Microsoft.CodeAnalysis.Workspaces.MSBuild.UnitTests.dll
                var assemblyLocation = typeof(DotNetSdkMSBuildInstalled).Assembly.Location;
                var solutionFolder = Directory.GetParent(assemblyLocation)
                    ?.Parent?.Parent?.Parent?.Parent?.Parent?.FullName;
                Assumes.NotNull(solutionFolder);
                return solutionFolder;
            }
        }
 
        private static bool HasNetCoreSdkForSolution(string solution)
        {
            BuildHostProcessManager? buildHostProcessManager = null;
 
            try
            {
                buildHostProcessManager = new BuildHostProcessManager();
 
                var buildHost = buildHostProcessManager.GetBuildHostAsync(BuildHostProcessManager.BuildHostProcessKind.NetCore, CancellationToken.None).Result;
 
                return buildHost.HasUsableMSBuildAsync(solution, CancellationToken.None).Result;
            }
            finally
            {
                buildHostProcessManager?.DisposeAsync().AsTask().Wait();
            }
        }
 
        public override bool ShouldSkip
            => s_skipReason is not null;
 
        public override string SkipReason
            => s_skipReason!;
    }
}