enum EventType {
    object_in_trash, object_destroyed, object_delivered
}

public class Event {
    event_type type;
    json data;
}

public class BasicLevelController
{
    public string description;
    private Dictionary<EventType, Func<Event, void> > events;
    private Dictionary<EventType, json > data;

    public bool IsEnd() { // закончен ли уровень
        foreach (KeyValuePair<EventType, json > element in data)
            if (!element["is_completed"])
                return false;
        return true;
    }

    public bool CheckEvent(Event event) {
        if (!events.Contains(event.type))
            return;
        events[event.type](event);
        return IsEnd();
    }
}

public class RedBoxController : BasicLevelController
{
    RedBoxController() {
        events[EventType.object_delivered] = CheckRedBoxs;
        data[EventType.object_delivered] = "
            "current_count": 0,
            "is_completed": false,
            "need_count": 10,
        "
    }

    void CheckRedBoxs(Event event) {
        if (event.data["object_type"] != "red_box" || event.data["delivery_status"] == DeliveryStatus.Success || data[event.type]["is_completed"])
            return;
        data[event.type]["current_count"] += 1;
        if (data[event.type]["current_count"] >= data[event.type]["need_count"])
            data[event.type]["is_completed"] == true;
    }

}