using System.Text.Json.Nodes;
using backend.Conversations;
using backend.Realtime;
using backend.Tools;
using FluentAssertions;
using Microsoft.Extensions.DependencyInjection;
using Xunit;

namespace backend.tests;

public class RealtimeSessionEndSessionTests(ApiFactory factory) : IClassFixture<ApiFactory>
{
    private readonly ApiFactory _factory = factory;

    [Fact]
    public async Task End_session_call_closes_session_with_reason_tool_and_skips_response_create()
    {
        using var scope = _factory.Services.CreateScope();
        var log = scope.ServiceProvider.GetRequiredService<ConversationLog>();
        var reg = new ToolRegistry(new ITool[] { new EndSessionTool() });
        var upstream = new ScriptedRealtimeUpstream();
        var sink = new RecordingSink();
        var cfg = new RealtimeSettings("m", "v", "p", 30, new HashSet<string> { "end_session" });
        var session = new RealtimeSession(Guid.NewGuid(), upstream, sink, log, reg, cfg,
            new FakeDeviceChannel(), NullLogger.Instance);

        upstream.Push(new JsonObject { ["type"] = "session.updated" });
        var run = session.RunAsync(default);
        await sink.WaitForAsync("session_started", TimeSpan.FromSeconds(2));

        upstream.Push(new JsonObject
        {
            ["type"] = "response.audio.delta",
            ["delta"] = Convert.ToBase64String(new byte[3840]),
        });
        upstream.Push(new JsonObject
        {
            ["type"] = "response.function_call_arguments.done",
            ["call_id"] = "c1",
            ["name"] = "end_session",
            ["arguments"] = "{}",
        });
        upstream.Push(new JsonObject { ["type"] = "response.done" });

        await run;

        sink.Binary.Should().NotBeEmpty();

        var ended = sink.Envelopes.Last(e => (string?)e["type"] == "session_ended");
        ((string?)ended["reason"]).Should().Be("tool");

        upstream.Sent.Should().NotContain(e => (string?)e["type"] == "response.create");
    }
}