using System.Net;

namespace Big.Tests;

/// <summary>A test double for <see cref="HttpMessageHandler"/> that records the last request and
/// returns a scripted response — the same approach the ACL gateway tests use.</summary>
internal sealed class StubHandler(Func<HttpRequestMessage, Task<HttpResponseMessage>> onSend) : HttpMessageHandler
{
    protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken ct)
        => onSend(request);
}

/// <summary>Captures the request a client sent, including the (buffered) body.</summary>
internal sealed class RequestCapture
{
    public HttpRequestMessage? Seen { get; private set; }
    public string? Body { get; private set; }

    /// <summary>A handler that records the request, then replies with <paramref name="status"/> and
    /// <paramref name="json"/>.</summary>
    public StubHandler Responds(HttpStatusCode status, string? json = null) => new(async req =>
    {
        Seen = req;
        Body = req.Content is null ? null : await req.Content.ReadAsStringAsync();
        var response = new HttpResponseMessage(status);
        if (json is not null)
            response.Content = new StringContent(json, System.Text.Encoding.UTF8, "application/json");
        return response;
    });
}