using FluentAssertions;
using IBKRTrader.Modules.Supervisor.Agent;

namespace IBKRTrader.Tests.Modules.Supervisor;

[Trait("cat", "unit")]
public class SupervisorAgentTests
{
    /// <summary>Fake-Client: gibt vorab definierte Antworten der Reihe nach zurück.</summary>
    private sealed class FakeChat : IChatCompletionClient
    {
        private readonly Queue<ChatResponse> _responses;
        public List<string> SeenToolResults { get; } = new();
        public FakeChat(params ChatResponse[] responses) => _responses = new(responses);

        public Task<ChatResponse> CompleteAsync(string model, IReadOnlyList<ChatMessage> messages,
            IReadOnlyList<SupervisorTool> tools, CancellationToken ct)
        {
            foreach (var m in messages)
                if (m.Role == "tool" && m.Content != null) SeenToolResults.Add(m.Content);
            return Task.FromResult(_responses.Dequeue());
        }
    }

    private static SupervisorToolRegistry EchoRegistry()
    {
        var reg = new SupervisorToolRegistry();
        reg.Register(new SupervisorTool("get_kpis", "KPIs", """{"type":"object"}""", _ => "{\"NetPnl\":42}"));
        return reg;
    }

    [Fact]
    public async Task RunsToolThenReturnsFinalAnswer()
    {
        var chat = new FakeChat(
            new ChatResponse { ToolCalls = { new ToolCall("c1", "get_kpis", "{}") } },
            new ChatResponse { Content = "Netto-PnL ist 42." });
        var agent = new SupervisorAgent(chat, EchoRegistry());

        var result = await agent.AskAsync("Wie ist die Performance?");

        result.Answer.Should().Be("Netto-PnL ist 42.");
        result.ToolInvocations.Should().ContainSingle();
        result.ToolInvocations[0].Tool.Should().Be("get_kpis");
        chat.SeenToolResults.Should().Contain(s => s.Contains("42"));   // Tool-Ergebnis ging ans Modell zurück
    }

    [Fact]
    public async Task ProfileFilter_DeniesUnlistedTool()
    {
        var chat = new FakeChat(
            new ChatResponse { ToolCalls = { new ToolCall("c1", "get_kpis", "{}") } },
            new ChatResponse { Content = "fertig" });
        // Technik-Profil listet get_kpis NICHT → Ausführung verweigert.
        var agent = new SupervisorAgent(chat, EchoRegistry());

        var result = await agent.AskAsync("test", profile: SupervisorProfiles.Technik);

        result.ToolInvocations[0].Result.Should().Contain("nicht freigegeben");
    }

    [Fact]
    public async Task StopsAfterMaxIterations()
    {
        // Modell fordert IMMER ein Tool an → harte Iterationsgrenze greift.
        var always = Enumerable.Range(0, SupervisorAgent.MaxIterations + 2)
            .Select(_ => new ChatResponse { ToolCalls = { new ToolCall("c", "get_kpis", "{}") } })
            .ToArray();
        var agent = new SupervisorAgent(new FakeChat(always), EchoRegistry());

        var result = await agent.AskAsync("Endlosschleife?");

        result.Answer.Should().Contain("maximale Tool-Iterationen");
    }
}