// <copyright file="NativeMethods.cs" company="OpenTelemetry Authors">
// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// </copyright>

using System.Runtime.InteropServices;

namespace OpenTelemetry.AutoInstrumentation;

internal static class NativeMethods
{
    private static readonly bool IsWindows = string.Equals(FrameworkDescription.Instance.OSPlatform, "Windows", StringComparison.OrdinalIgnoreCase);

    public static bool IsProfilerAttached()
    {
        if (IsWindows)
        {
            return Windows.IsProfilerAttached();
        }

        return NonWindows.IsProfilerAttached();
    }

    // the "dll" extension is required on .NET Framework
    // and optional on .NET Core
    private static class Windows
    {
        [DllImport("OpenTelemetry.AutoInstrumentation.Native.dll")]
        public static extern bool IsProfilerAttached();
    }

    // assume .NET Core if not running on Windows
    private static class NonWindows
    {
        [DllImport("OpenTelemetry.AutoInstrumentation.Native")]
        public static extern bool IsProfilerAttached();
    }
}
