// 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.CodeAnalysis;
using System.IO;
using System.Reflection;

namespace System.Runtime.InteropServices
{
    public static class RuntimeEnvironment
    {
        [Obsolete(Obsoletions.RuntimeEnvironmentMessage, DiagnosticId = Obsoletions.RuntimeEnvironmentDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
        public static string SystemConfigurationFile => throw new PlatformNotSupportedException();

        public static bool FromGlobalAccessCache(Assembly a) => false;

        [UnconditionalSuppressMessage("SingleFile", "IL3000: Avoid accessing Assembly file path when publishing as a single file",
            Justification = "This call is fine because the code handles the Assembly.Location equals null by calling AppDomain.CurrentDomain.BaseDirectory")]
        public static string GetRuntimeDirectory()
        {
            string? runtimeDirectory = typeof(object).Assembly.Location;
            if (!Path.IsPathRooted(runtimeDirectory))
            {
                runtimeDirectory = AppDomain.CurrentDomain.BaseDirectory;
            }

            char sep = Path.DirectorySeparatorChar;
            return string.Concat(Path.GetDirectoryName(runtimeDirectory), new ReadOnlySpan<char>(in sep));
        }

        [Obsolete(Obsoletions.RuntimeEnvironmentMessage, DiagnosticId = Obsoletions.RuntimeEnvironmentDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
        public static IntPtr GetRuntimeInterfaceAsIntPtr(Guid clsid, Guid riid) => throw new PlatformNotSupportedException();

        [Obsolete(Obsoletions.RuntimeEnvironmentMessage, DiagnosticId = Obsoletions.RuntimeEnvironmentDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
        public static object GetRuntimeInterfaceAsObject(Guid clsid, Guid riid) => throw new PlatformNotSupportedException();

        public static string GetSystemVersion() => $"v{Environment.Version}";
    }
}