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

namespace Svrnty.CQRS.Events.Kafka;

/// <summary>
/// Extension methods for registering Kafka domain event publishing.
/// </summary>
public static class ServiceCollectionExtensions
{
    /// <summary>
    /// Adds Kafka domain event publishing to the service collection.
    /// </summary>
    /// <param name="services">The service collection.</param>
    /// <param name="configure">Optional configuration action for Kafka options.</param>
    /// <returns>The service collection for chaining.</returns>
    public static IServiceCollection AddKafkaDomainEvents(
        this IServiceCollection services,
        Action<KafkaEventOptions>? configure = null)
    {
        if (configure != null)
        {
            services.Configure(configure);
        }

        services.AddSingleton<IDomainEventPublisher, KafkaDomainEventPublisher>();

        return services;
    }

    /// <summary>
    /// Adds Kafka domain event publishing with custom topic mapping.
    /// </summary>
    /// <param name="services">The service collection.</param>
    /// <param name="topicMapper">Custom function to map event type names to topic names.</param>
    /// <param name="configure">Optional configuration action for other Kafka options.</param>
    /// <returns>The service collection for chaining.</returns>
    public static IServiceCollection AddKafkaDomainEvents(
        this IServiceCollection services,
        Func<string, string> topicMapper,
        Action<KafkaEventOptions>? configure = null)
    {
        services.Configure<KafkaEventOptions>(options =>
        {
            options.TopicMapper = topicMapper;
            configure?.Invoke(options);
        });

        services.AddSingleton<IDomainEventPublisher, KafkaDomainEventPublisher>();

        return services;
    }
}