// Copyright (c) Microsoft Open Technologies, Inc.
// All Rights Reserved
//
// 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
//
// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING
// WITHOUT LIMITATION ANY IMPLIED WARRANTIES OR CONDITIONS OF
// TITLE, FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABLITY OR
// NON-INFRINGEMENT.
// See the Apache 2 License for the specific language governing
// permissions and limitations under the License.

using System;

namespace Microsoft.TestCommon
{
    /// <summary>
    /// Used to retrieve the currently running platform.
    /// </summary>
    public static class PlatformInfo
    {
        private const string _net45TypeName = "System.IWellKnownStringEqualityComparer, mscorlib, Version=4.0.0.0, PublicKeyToken=b77a5c561934e089";
        private static Lazy<Platform> _platform = new Lazy<Platform>(GetPlatform, isThreadSafe: true);

        /// <summary>
        /// Gets the platform that the unit test is currently running on.
        /// </summary>
        public static Platform Platform
        {
            get { return _platform.Value; }
        }

        private static Platform GetPlatform()
        {
            if (Type.GetType(_net45TypeName, throwOnError: false) != null)
            {
                return Platform.Net45;
            }

            return Platform.Net40;
        }
    }
}