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

interface UseMedicationDispenseWebSocketOptions {
    medicationDispense?: MedicationDispense;
    medicationDispenseId?: string;
    isOpen?: boolean;
    onUpdate: (medicationDispense: MedicationDispense) => void;
    onDelete: () => void;
}

export const useFhirMedicationDispenseTargetedBroadcast = ({
                                                               medicationDispense,
                                                               medicationDispenseId,
                                                               isOpen = true,
                                                               onUpdate,
                                                               onDelete
                                                           }: UseMedicationDispenseWebSocketOptions) => {
    const { subscribe, unsubscribe } = useWebSocketServiceContext();
    const { patientState } = usePatientServiceContext();

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

        const handleMedicationDispenseEvent = (cloudEvent: any) => {
            const medicationDispensePayload: MedicationDispense = cloudEvent.data;
            const eventType = cloudEvent.type;

            const targetId = medicationDispenseId || medicationDispense.id;

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

        subscribe('com.akashichealthrecords.fhir.medicationdispense.updated', handleMedicationDispenseEvent);
        subscribe('com.akashichealthrecords.fhir.medicationdispense.deleted', handleMedicationDispenseEvent);

        return () => {
            unsubscribe('com.akashichealthrecords.fhir.medicationdispense.updated', handleMedicationDispenseEvent);
            unsubscribe('com.akashichealthrecords.fhir.medicationdispense.deleted', handleMedicationDispenseEvent);
        };
    }, [patientState, medicationDispense, medicationDispenseId, isOpen, onUpdate, onDelete, subscribe, unsubscribe]);
};