using Fake.DependencyInjection;
using Fake.EventBus;
using Fake.UnitOfWork;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using Oms.Application.Services.Orders.Batch;

namespace Oms.Application.Messaging;

/// <summary>
/// 订单批量集成事件处理器。
/// 正常返回 Ack；抛异常由 Fake.EventBus.RabbitMQ 重试后 Nack 进 DLX。
/// </summary>
public sealed class OrderBatchJobEventHandler(
    OrderBatchJobProcessor processor,
    IUnitOfWorkManager unitOfWorkManager,
    IOptions<OrderBatchRabbitMqOptions> options,
    ILogger<OrderBatchJobEventHandler> logger)
    : IEventHandler<OrderBatchJobIntegrationEvent>, ITransientDependency
{
    public async Task HandleAsync(OrderBatchJobIntegrationEvent @event, CancellationToken cancellationToken)
    {
        if (!options.Value.Enabled)
        {
            logger.LogDebug(
                "Order batch messaging disabled, skip event {EventId} action={Action}",
                @event.Id,
                @event.Action);
            return;
        }

        // ForecastBilling 成功后继续写轨迹/面单/自动触发 Outbox，须事务性 UoW
        using var unitOfWork = unitOfWorkManager.Begin(OmsOutboxUnitOfWork.Transactional());
        await processor.ProcessAsync(@event.ToMessage(), cancellationToken);
        await unitOfWork.CompleteAsync(cancellationToken);
    }
}