using System.Net;
using System.Text;
using Microsoft.Extensions.Configuration;
using Nexus.Api.Services;
using Xunit;

namespace Nexus.Api.Tests;

public sealed class OpenClawGatewayClientTests
{
    [Fact]
    public async Task GetSessionHistoryAsync_ProjectsOnlyUserAndAssistantText()
    {
        var client = CreateClient(
            """
            {
              "ok": true,
              "result": {
                "details": {
                  "messages": [
                    {
                      "role": "user",
                      "content": [{ "type": "text", "text": "Plan the release" }],
                      "timestamp": "2026-07-30T10:00:00Z"
                    },
                    {
                      "role": "assistant",
                      "content": [
                        { "type": "text", "text": "Release" },
                        { "type": "text", "text": "planned" },
                        { "type": "toolCall", "name": "ignored" }
                      ],
                      "timestamp": "2026-07-30T10:01:00Z"
                    },
                    {
                      "role": "tool",
                      "content": [{ "type": "text", "text": "hidden tool output" }]
                    }
                  ]
                }
              }
            }
            """);

        var history = await client.GetSessionHistoryAsync("agent:iris:main");

        Assert.Collection(
            history,
            message =>
            {
                Assert.Equal("user", message.Role);
                Assert.Equal("Plan the release", message.Content);
            },
            message =>
            {
                Assert.Equal("assistant", message.Role);
                Assert.Equal("Release planned", message.Content);
            });
    }

    [Fact]
    public async Task GetSessionHistoryAsync_GatewayFailureReturnsNoFabricatedMessages()
    {
        var configuration = new ConfigurationBuilder().Build();
        var httpClient = new HttpClient(new StubHandler(_ =>
            new HttpResponseMessage(HttpStatusCode.ServiceUnavailable)))
        {
            BaseAddress = new Uri("http://gateway.local")
        };
        var client = new OpenClawGatewayClient(httpClient, configuration);

        var history = await client.GetSessionHistoryAsync("agent:iris:main");

        Assert.Empty(history);
    }

    private static OpenClawGatewayClient CreateClient(string responseJson)
    {
        var configuration = new ConfigurationBuilder().Build();
        var httpClient = new HttpClient(new StubHandler(_ =>
            new HttpResponseMessage(HttpStatusCode.OK)
            {
                Content = new StringContent(responseJson, Encoding.UTF8, "application/json")
            }))
        {
            BaseAddress = new Uri("http://gateway.local")
        };
        return new OpenClawGatewayClient(httpClient, configuration);
    }

    private sealed class StubHandler(
        Func<HttpRequestMessage, HttpResponseMessage> responder) : HttpMessageHandler
    {
        protected override Task<HttpResponseMessage> SendAsync(
            HttpRequestMessage request,
            CancellationToken cancellationToken)
            => Task.FromResult(responder(request));
    }
}