// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Diagnostics;
 
namespace Microsoft.DotNet.NativeWrapper
{
    public static class NETCoreSdkResolverNativeWrapper
    {
        public static SdkResolutionResult ResolveSdk(
            string? dotnetExeDirectory,
            string? globalJsonStartDirectory,
            bool disallowPrerelease = false)
        {
            var result = new SdkResolutionResult();
            var flags = disallowPrerelease ? Interop.hostfxr_resolve_sdk2_flags_t.disallow_prerelease : 0;
 
            int errorCode = Interop.RunningOnWindows
                ? Interop.Windows.hostfxr_resolve_sdk2(dotnetExeDirectory, globalJsonStartDirectory, flags, result.Initialize)
                : Interop.Unix.hostfxr_resolve_sdk2(dotnetExeDirectory, globalJsonStartDirectory, flags, result.Initialize);
 
            Debug.Assert((errorCode == 0) == (result.ResolvedSdkDirectory != null));
            return result;
        }
 
        private sealed class SdkList
        {
            public string[]? Entries;
 
            public void Initialize(int count, string[] entries)
            {
                entries = entries ?? Array.Empty<string>();
                Debug.Assert(count == entries.Length);
                Entries = entries;
            }
        }
 
        public static string[]? GetAvailableSdks(string? dotnetExeDirectory)
        {
            var list = new SdkList();
 
            int errorCode = Interop.RunningOnWindows
                ? Interop.Windows.hostfxr_get_available_sdks(dotnetExeDirectory, list.Initialize)
                : Interop.Unix.hostfxr_get_available_sdks(dotnetExeDirectory, list.Initialize);
 
            return list.Entries;
        }
    }
}