using System.Net;
using System.Net.Http;
using System.Text;
using Microsoft.Extensions.Caching.Memory;
using Moq;
using Xunit;
using JobTrackerApi.Services;

namespace JobTrackerApi.Tests;

public sealed class SummarizerServiceTests
{
    [Fact]
    public async Task Summarize_section_clamps_lengths_to_ai_service_limits()
    {
        var handler = new CapturingHandler();
        var httpClient = new HttpClient(handler)
        {
            BaseAddress = new Uri("http://localhost:8001")
        };

        var httpFactory = new Mock<IHttpClientFactory>();
        httpFactory.Setup(x => x.CreateClient("ai-service")).Returns(httpClient);

        using var memoryCache = new MemoryCache(new MemoryCacheOptions());
        var service = new SummarizerService(httpFactory.Object, memoryCache);

        var result = await service.SummarizeSectionAsync("Rewrite this CV", "Professional Summary\nBuilt backend systems.", 1800, 400);

        Assert.Equal("ok", result);
        Assert.NotNull(handler.LastBody);
        Assert.Contains("\"max_length\":256", handler.LastBody);
        Assert.Contains("\"min_length\":180", handler.LastBody);
    }

    private sealed class CapturingHandler : HttpMessageHandler
    {
        public string? LastBody { get; private set; }

        protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
        {
            LastBody = request.Content is null ? null : await request.Content.ReadAsStringAsync(cancellationToken);
            return new HttpResponseMessage(HttpStatusCode.OK)
            {
                Content = new StringContent("{\"summary\":\"ok\"}", Encoding.UTF8, "application/json")
            };
        }
    }
}