// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
 
#pragma warning disable SA1204 // Static elements should appear before instance elements
#pragma warning disable SA1402 // File may only contain a single type
 
namespace Microsoft.Extensions.AI;
 
internal sealed class CallCountingChatClient(IChatClient innerClient) : DelegatingChatClient(innerClient)
{
    private int _callCount;
 
    public int CallCount => _callCount;
 
    public override Task<ChatResponse> GetResponseAsync(
        IEnumerable<ChatMessage> messages, ChatOptions? options = null, CancellationToken cancellationToken = default)
    {
        Interlocked.Increment(ref _callCount);
        return base.GetResponseAsync(messages, options, cancellationToken);
    }
 
    public override IAsyncEnumerable<ChatResponseUpdate> GetStreamingResponseAsync(
        IEnumerable<ChatMessage> messages, ChatOptions? options = null, CancellationToken cancellationToken = default)
    {
        Interlocked.Increment(ref _callCount);
        return base.GetStreamingResponseAsync(messages, options, cancellationToken);
    }
}
 
internal static class CallCountingChatClientBuilderExtensions
{
    public static ChatClientBuilder UseCallCounting(this ChatClientBuilder builder) =>
        builder.Use(innerClient => new CallCountingChatClient(innerClient));
}