using Akka.Actor;
using Akka.Hosting;
using Microsoft.AspNetCore.SignalR;
using Microsoft.Extensions.DependencyInjection;

namespace ZB.MOM.WW.OtOpcUa.AdminUI.Hubs;

public static class HubServiceCollectionExtensions
{
    public const string FleetStatusSignalRBridgeName = "fleet-status-signalr-bridge";

    /// <summary>
    /// Spawns the SignalR bridge actors that forward DPS messages to browser-facing SignalR
    /// hubs. Currently: <see cref="FleetStatusSignalRBridge"/> (DPS <c>fleet-status</c> topic →
    /// <see cref="FleetStatusHub"/> clients).
    ///
    /// Call inside the admin-role configurator on the shared <see cref="AkkaConfigurationBuilder"/>:
    /// <code>
    /// if (hasAdmin)
    /// {
    ///     ab.WithOtOpcUaControlPlaneSingletons();
    ///     ab.WithOtOpcUaSignalRBridges();
    /// }
    /// </code>
    /// </summary>
    public static AkkaConfigurationBuilder WithOtOpcUaSignalRBridges(this AkkaConfigurationBuilder builder)
    {
        builder.WithActors((system, registry, resolver) =>
        {
            var hub = resolver.GetService<IHubContext<FleetStatusHub>>();
            var actor = system.ActorOf(FleetStatusSignalRBridge.Props(hub), FleetStatusSignalRBridgeName);
            registry.Register<FleetStatusSignalRBridgeKey>(actor);
        });
        return builder;
    }
}

/// <summary>Marker key for <see cref="ActorRegistry"/> lookup of the SignalR bridge actor.</summary>
public sealed class FleetStatusSignalRBridgeKey { }