// 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;
using System.Linq;
 
namespace Microsoft.Extensions.DependencyInjection
{
    internal sealed class DefaultHttpClientBuilder : IHttpClientBuilder
    {
        public DefaultHttpClientBuilder(IServiceCollection services, string name)
        {
            // The tracker references a descriptor. It marks the position of where default services are added to the collection.
            var tracker = (DefaultHttpClientConfigurationTracker?)services.Single(sd => sd.ServiceType == typeof(DefaultHttpClientConfigurationTracker)).ImplementationInstance;
            Debug.Assert(tracker != null);
 
            Services = new DefaultHttpClientBuilderServiceCollection(services, name == null, tracker);
            Name = name!;
        }
 
        public string Name { get; }
 
        public IServiceCollection Services { get; }
    }
}