import { useEffect } from 'react';
import { MedicationRequest } from 'fhir/r4';
import { usePatientServiceContext, useWebSocketServiceContext } from '../services';

interface UseMedicationRequestWebSocketOptions {
    medicationRequest?: MedicationRequest;
    medicationRequestId?: string;
    isOpen?: boolean;
    onUpdate: (medicationRequest: MedicationRequest) => void;
    onDelete: () => void;
}

export const useFhirMedicationRequestTargetedBroadcast = ({
                                                              medicationRequest,
                                                              medicationRequestId,
                                                              isOpen = true,
                                                              onUpdate,
                                                              onDelete
                                                          }: UseMedicationRequestWebSocketOptions) => {
    const { subscribe, unsubscribe } = useWebSocketServiceContext();
    const { patientState } = usePatientServiceContext();

    useEffect(() => {
        if (!patientState || !medicationRequest || !isOpen) {
            return;
        }

        const handleMedicationRequestEvent = (cloudEvent: any) => {
            const medicationRequestPayload: MedicationRequest = cloudEvent.data;
            const eventType = cloudEvent.type;

            const targetId = medicationRequestId || medicationRequest.id;

            if (medicationRequestPayload.id === targetId) {
                switch (eventType) {
                    case 'com.akashichealthrecords.fhir.medicationrequest.updated':
                        onUpdate(medicationRequestPayload);
                        break;
                    case 'com.akashichealthrecords.fhir.medicationrequest.deleted':
                        onDelete();
                        break;
                }
            }
        };

        subscribe('com.akashichealthrecords.fhir.medicationrequest.updated', handleMedicationRequestEvent);
        subscribe('com.akashichealthrecords.fhir.medicationrequest.deleted', handleMedicationRequestEvent);

        return () => {
            unsubscribe('com.akashichealthrecords.fhir.medicationrequest.updated', handleMedicationRequestEvent);
            unsubscribe('com.akashichealthrecords.fhir.medicationrequest.deleted', handleMedicationRequestEvent);
        };
    }, [patientState, medicationRequest, medicationRequestId, isOpen, onUpdate, onDelete, subscribe, unsubscribe]);
};