using Microsoft.Extensions.DependencyInjection;
using Svrnty.CQRS.Events.Abstractions.Notifications;
using Svrnty.CQRS.Events.Abstractions.Delivery;
using Microsoft.Extensions.DependencyInjection.Extensions;
using Svrnty.CQRS.Events.Abstractions;

namespace Svrnty.CQRS.Events.Grpc;

/// <summary>
/// Service collection extensions for gRPC event streaming.
/// </summary>
public static class ServiceCollectionExtensions
{
    /// <summary>
    /// Add gRPC event streaming support.
    /// Requires Grpc.AspNetCore to be configured in the application.
    /// </summary>
    /// <remarks>
    /// <para>
    /// <strong>Phase 1.7:</strong>
    /// Registers the gRPC event delivery provider for push-based streaming.
    /// </para>
    /// </remarks>
    public static IServiceCollection AddSvrntyEventsGrpc(this IServiceCollection services)
    {
        // EventServiceImpl is registered as a singleton so we can access the static notification method
        services.AddSingleton<EventServiceImpl>();

        // Register the gRPC event notifier (legacy)
        services.TryAddSingleton<IEventNotifier, GrpcEventNotifier>();

        // Phase 1.7: Register gRPC event delivery provider
        services.TryAddSingleton<IEventDeliveryProvider, GrpcEventDeliveryProvider>();

        return services;
    }
}