using Akka.Actor;
using Akka.TestKit.Xunit2;
using Microsoft.Extensions.DependencyInjection;
using NSubstitute;
using Xunit;
using ZB.MOM.WW.ScadaBridge.Commons.Entities.Sites;
using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Repositories;
using ZB.MOM.WW.ScadaBridge.Communication.Actors;
using ZB.MOM.WW.ScadaBridge.HealthMonitoring;

namespace ZB.MOM.WW.ScadaBridge.Communication.Tests;

/// <summary>
/// Transport-agnostic refresh behaviour of <see cref="CentralCommunicationActor"/>: the periodic
/// DB refresh evicts deleted sites from the health aggregator. The two former tests here —
/// per-site ClusterClient recreate-without-restart-loop and factory-throw resilience — asserted
/// Akka <c>AkkaSiteTransport</c> internals (InvalidActorNameException, "No ClusterClient for site")
/// and were removed with that transport in the ClusterClient→gRPC migration's Phase 4; the
/// equivalent gRPC channel reconcile is covered by the <c>GrpcSiteTransport</c> suites.
/// </summary>
public class CentralCommunicationActorClientLifecycleTests : TestKit
{
    [Fact]
    public void PeriodicRefresh_PrunesDeletedSites_FromHealthAggregator()
    {
        // PLAN-01 Task 18: the periodic site refresh feeds the currently-configured
        // site ids to the aggregator so a deleted site is evicted within one
        // refresh interval. Repo returns only "site-a".
        var siteRepo = Substitute.For<ISiteRepository>();
        siteRepo.GetAllSitesAsync(Arg.Any<CancellationToken>())
            .Returns(new List<Site> { new("Site A", "site-a") });
        var aggregator = Substitute.For<ICentralHealthAggregator>();
        var services = new ServiceCollection();
        services.AddScoped(_ => siteRepo);
        services.AddSingleton(aggregator);
        var provider = services.BuildServiceProvider();

        var transport = Substitute.For<ISiteCommandTransport>();
        var actor = Sys.ActorOf(Props.Create(() => new CentralCommunicationActor(
            provider, transport)));

        // Trigger the refresh (also fires at PreStart, but drive it explicitly so
        // the assertion is deterministic). The load runs on a detached task and
        // pipes SiteAddressCacheLoaded back to the actor, which then prunes.
        actor.Tell(new RefreshSiteAddresses());

        AwaitAssert(
            () => aggregator.Received().PruneUnknownSites(
                Arg.Is<IReadOnlyCollection<string>>(ids => ids.Contains("site-a"))),
            TimeSpan.FromSeconds(3));
    }
}
