class Slot {
	int slotNumber;
	SlotType slotType;
	SlotStatus slotStatus;
	
	void setSlotStatus(SlotStatus slotStatus) {}
}

class Vehicle {
	String registrationNumber;
	VehicleSize vehicleSize;
}

class Ticket {
	String ticketNumber;
	Vehicle vehicle;
	int slotNumber;
	TicketStatus ticketStatus;
	DateTime issuedTime;
	DateTime exitTime;
	
	void setTicketStatus(TicketStatus ticketStatus){}
	void setExitTime(DateTime exitTime) {}
}

class VehicleSlotMapper {
	Map<VehicleType, SlotType> vehicleSlotMap;
	
	static List<SlotType> getMatchingSlotsForVehicle(VehicleType vehicleType){}
}

class ParkingLot {
	SlotManager slotManager;
	AssignmentStrategy assignmentStrategy;
	TicketManager ticketManager;
	
	Ticket parkVehicle(Vehicle vehicle) {}
	void payTicket(Ticket ticket) {}
}

class SlotManager {
	List<Slot> slots;
	Map<Slot, Ticket> usedSlotVehicleMap;	

	void createSlot(SlotType slotType) {}
	void assignSlotToVehicle(Slot slot, Ticket ticket) {}
	List<Slot> getAllSlots(){}
	List<Slot> getAvailableSlots(){}
	Map<Slot, Ticket> getUsedSlotVehicleInfo(){}
	void makeSlotAvailable(Slot slot) {}
}

class TicketManager {
	Map<String, Ticket> tickets;
	
	void createTicket(Vehicle vehicle, int slotNumber, DateTime issuedTime){}
	void markTicketAsPaid(Ticket ticket) {}
}

interface AssignmentStrategy {
	
	Slot assignParkingSpace(List<Slot> slots, Vehicle vehicle);
}

class NearestSizeAppropriate implements AssignmentStrategy {
	
	Slot assignParkingSpace(List<Slot> slots, Vehicle vehicle) {
	}
}