using System.Net;
using System.Net.Sockets;
using Akka.Actor;
using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Commons.Types;
using ZB.MOM.WW.OtOpcUa.Runtime.Health;
using ZB.MOM.WW.OtOpcUa.Runtime.Historian;
using ZB.MOM.WW.OtOpcUa.Runtime.Tests.Harness;

namespace ZB.MOM.WW.OtOpcUa.Runtime.Tests.Health;

public sealed class HealthProbeActorTests : RuntimeActorTestBase
{
    [Fact]
    public async Task DbHealthProbeActor_returns_reachable_against_in_memory_db()
    {
        var db = NewInMemoryDbFactory();
        var actor = Sys.ActorOf(DbHealthProbeActor.Props(db));

        var status = await actor.Ask<DbHealthProbeActor.DbHealthStatus>(
            DbHealthProbeActor.GetStatus.Instance, TimeSpan.FromSeconds(3));

        status.Reachable.ShouldBeTrue();
        status.LastError.ShouldBeNull();
    }

    [Fact]
    public void PeerOpcUaProbeActor_reports_Ok_true_against_a_live_listener()
    {
        using var listener = new TcpListener(IPAddress.Loopback, 0);
        listener.Start();
        var port = ((IPEndPoint)listener.LocalEndpoint).Port;

        var received = new System.Collections.Generic.List<object>();
        Sys.ActorOf(PeerOpcUaProbeActor.Props(
            NodeId.Parse($"127.0.0.1:{port}"),
            interval: TimeSpan.FromMilliseconds(50),
            connectTimeout: TimeSpan.FromMilliseconds(500),
            opcUaPort: port,
            broadcast: msg => received.Add(msg)));

        AwaitCondition(() => received.OfType<PeerOpcUaProbeActor.OpcUaProbeResult>().Any(r => r.Ok),
            TimeSpan.FromSeconds(3));
    }

    [Fact]
    public void PeerOpcUaProbeActor_reports_Ok_false_against_an_unreachable_endpoint()
    {
        // Port 1 is reserved (tcpmux) and almost never bound on dev machines, so the connect fails fast.
        var received = new System.Collections.Generic.List<object>();
        Sys.ActorOf(PeerOpcUaProbeActor.Props(
            NodeId.Parse("127.0.0.1:1"),
            interval: TimeSpan.FromMilliseconds(50),
            connectTimeout: TimeSpan.FromMilliseconds(300),
            opcUaPort: 1,
            broadcast: msg => received.Add(msg)));

        AwaitCondition(() => received.OfType<PeerOpcUaProbeActor.OpcUaProbeResult>().Any(r => !r.Ok),
            TimeSpan.FromSeconds(3));
    }

    [Fact]
    public void HistorianAdapterActor_buffers_rows()
    {
        var actor = Sys.ActorOf(HistorianAdapterActor.Props());
        for (var i = 0; i < 5; i++)
            actor.Tell(new HistorianAdapterActor.HistoryRow("driver-a", $"tag-{i}", i, DateTime.UtcNow));

        ExpectNoMsg(TimeSpan.FromMilliseconds(100));
        // No direct readback of the count from a sealed actor — assert by Ask of a self-probe later
        // when the engine wiring lands (F11). For now this asserts the actor accepts the contract.
    }
}