using System.Reflection;
using FluentValidation;
using LiteCqrs.Behaviors;
using LiteCqrs.DependencyInjection;
using Microsoft.Extensions.DependencyInjection;
using TeleWave.Application.Common.Behaviors;

namespace TeleWave.Application;

public static class DependencyInjection
{
    public static IServiceCollection AddApplication(this IServiceCollection services)
    {
        var assembly = typeof(DependencyInjection).Assembly;

        services.AddLiteCqrs(cqrs =>
        {
            cqrs.RegisterServicesFromAssembly(assembly);
            cqrs.Lifetime = ServiceLifetime.Scoped;

            // Порядок важен: Logging (внешний) -> Validation -> UnitOfWork (ближе всего к хендлеру).
            cqrs.AddOpenBehavior(typeof(LoggingBehavior<,>));
            cqrs.AddOpenBehavior(typeof(ValidationBehavior<,>));
            cqrs.AddOpenBehavior(typeof(UnitOfWorkBehavior<,>));
        });

        RegisterClosedGeneric(services, assembly, typeof(IValidator<>));

        return services;
    }

    private static void RegisterClosedGeneric(IServiceCollection services, Assembly assembly, Type openInterface)
    {
        var implementations = assembly.GetTypes()
            .Where(t => t is { IsClass: true, IsAbstract: false })
            .SelectMany(t => t.GetInterfaces()
                .Where(i => i.IsGenericType && i.GetGenericTypeDefinition() == openInterface)
                .Select(i => (Service: i, Implementation: t)));

        foreach (var (service, implementation) in implementations)
            services.AddScoped(service, implementation);
    }
}