namespace Femto.Common.Integration;

public interface IEventHandler
{
    Task Handle(IEvent evt, CancellationToken cancellationToken = default);
}

public abstract class EventHandler<T> : IEventHandler
    where T : IEvent
{
    protected abstract Task Handle(T evt, CancellationToken cancellationToken);

    public async Task Handle(IEvent evt, CancellationToken cancellationToken = default)
    {
        if (evt is not T typedEvt)
        {
            throw new InvalidOperationException(
                $"Event {evt.GetType()} is not of type {typeof(T)}"
            );
        }

        await Handle(typedEvt, cancellationToken);
    }
}