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

namespace Oms.Application.Messaging.ParcelCreate;

/// <summary>
/// 处理创单后系统面单生成事件。
/// </summary>
public sealed class OrderParcelLabelGenerateEventHandler(
    IServiceScopeFactory scopeFactory,
    IUnitOfWorkManager unitOfWorkManager,
    ILogger<OrderParcelLabelGenerateEventHandler> logger)
    : IEventHandler<OrderParcelLabelGenerateIntegrationEvent>, ITransientDependency
{
    public async Task HandleAsync(
        OrderParcelLabelGenerateIntegrationEvent @event,
        CancellationToken cancellationToken)
    {
        using var unitOfWork = unitOfWorkManager.Begin(OmsOutboxUnitOfWork.Transactional());
        using var scope = scopeFactory.CreateScope();
        var orderService = scope.ServiceProvider.GetRequiredService<OrderService>();
        var result = await orderService.GenerateLabelPdfForBatchAsync(@event.OrderId, cancellationToken);
        if (!result.Success)
        {
            // 面单失败不阻断创单主链路；记录后正常 Ack，避免反复重试打满队列
            logger.LogWarning(
                "Label generate failed OrderId={OrderId} Error={Error}",
                @event.OrderId,
                result.Error);
        }

        await unitOfWork.CompleteAsync(cancellationToken);
    }
}