public UserState Calculate(IEnumerable <BaseEvent> baseEvents, DateTime currentTime)
{
// Posortuj eventy w kolejności wystąpienia
var eventQueue = baseEvents.OrderBy(x => x.Date);
BaseEvent lastOperation = null;
UserState currentState = null;
foreach (var @event in eventQueue)
{
var handler = _handlers[@event.GetType()];
@event.State = handler(@event, UserState.Copy(lastOperation?.State ?? new UserState()));
lastOperation = @event;
if (@event.Date <= currentTime)
{
currentState = @event.State;
}
}
return(currentState);
}