// 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.
 
#nullable disable
 
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Linq;
using System.Reflection;
 
namespace Microsoft.CodeAnalysis.Host.Mef
{
    internal static class MefHostServicesHelpers
    {
        public static ImmutableArray<Assembly> LoadNearbyAssemblies(IEnumerable<string> assemblyNames)
        {
            var assemblies = new List<Assembly>();
 
            foreach (var assemblyName in assemblyNames)
            {
                var assembly = TryLoadNearbyAssembly(assemblyName);
                if (assembly != null)
                {
                    assemblies.Add(assembly);
                }
            }
 
            return assemblies.ToImmutableArray();
        }
 
        private static Assembly TryLoadNearbyAssembly(string assemblySimpleName)
        {
            var thisAssemblyName = typeof(MefHostServicesHelpers).GetTypeInfo().Assembly.GetName();
            var assemblyShortName = thisAssemblyName.Name;
            var assemblyVersion = thisAssemblyName.Version;
            var publicKeyToken = thisAssemblyName.GetPublicKeyToken().Aggregate(string.Empty, (s, b) => s + b.ToString("x2"));
 
            if (string.IsNullOrEmpty(publicKeyToken))
            {
                publicKeyToken = "null";
            }
 
            var assemblyName = new AssemblyName(string.Format("{0}, Version={1}, Culture=neutral, PublicKeyToken={2}", assemblySimpleName, assemblyVersion, publicKeyToken));
 
            try
            {
                return Assembly.Load(assemblyName);
            }
            catch (Exception)
            {
                return null;
            }
        }
    }
}