Draw a proper use case, activity $($ of one external event$),$ and domain class diagram for the following case:

The system will handle the admissions process for the Mount Sinai Hospital Admission System $($MSHAS$)$

Admissions are of two basic types; scheduled and emergency.

To reserve a bed for a future admission the Admission$$s clerk will first check by entering the health card # if there is already a patient record registered. If there is not the clerk will enter the patient$$s basic details. A Reservation record will be created for that patient for a bed in the appropriate ward. Reservations have an expected admit and an expected discharge date. The system will confirm and display the new reservation

When a patient that has already been scheduled arrives on the appropriate date they will present themselves to the Admissions reception. The Admission$$s clerk will admit the scheduled patient by first entering the patient$$s health card # $.$ The system will display the patient details and the clerk will verifying the details already registered in the system. Where changes are necessary they will be entered the system will apply updates where necessary. The basic information about a patient already held by the system will be name, address, DOB, gender, phone number and next of kin. A bed in the appropriate ward would already have a reservation for this patient. The clerk will confirm the admission to the system which will create An Occupancy record for that patient with an actual admit date and the bed$$s status will updated accordingly as $$occupied$.$

When there is an Emergency admission, a check will be made for an $$unoccupied$$ bed of the type required. If there are no vacancies this will be notified and the patient is not admitted. If there is an available bed the patient will be registered if not already in the system with as much information as available and then patient will be assigned to the available bed and an Occupancy record created. Note that all patients are assigned a unique patient # on registration.

When patients are discharged the Admissions clerk will input the patient # and actual discharge date, and the bed$$s associated occupancy record will be removed and a past admissions record created for that patient. It will contain the actual admit and discharge dates. The status of the bed will be changed from $$occupied$$ to $$unoccupied$.$

In addition to the patient data, data is also retained on the beds and the wards. Each bed in a Ward has a bed # and availability status. Wards are named, have a specialty designation, a generic bed type and are located on a specific floor and wing of the hospital. Obviously, each ward can have many beds.

A report is produced daily showing the current status of all beds for each ward in the hospital.

Patient Services also require access to the system to respond to queries from relatives and friends of patients with their ward and room location as well as the ward$$s visiting hours which are different for different wards.