Bloated.cs

public class DispatchShipmentHandler : ICommandHandler<DispatchShipment>
{
    private readonly Db _db;
    private readonly IEmailer _emailer;
    private readonly IEventPublisher _eventPublisher;
    private readonly ILogger _logger;

    public DispatchShipmentHandler(Db db, IEmailer emailer, IEventPublisher eventPublisher, ILogger logger)
    {
        _db = db;
        _emailer = emailer;
        _eventPublisher = eventPublisher;
        _logger = logger;
    }

    public void Handle(DispatchShipment command)
    {
        var shipment = _db.GetById(command.ShipmentId);
        if (shipment == null)
        {
            throw new InvalidOperationException("Shipment not found.");
        }

        if (shipment.Status != ShipmentStatus.Ready)
        {
            throw new InvalidOperationException("Shipment is not ready for dispatch.");
        }

        shipment.Status = ShipmentStatus.Dispatched;
        shipment.DispatchedAt = DateTime.UtcNow;

        _db.Save(shipment);

        _emailer.NotifyCustomer(shipment);

        _eventPublisher.Publish(new ShipmentDispatched(shipment.Id, shipment.DispatchedAt));

        _logger.Log($"Shipment {shipment.Id} dispatched.");
    }
}