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

interface UseVisionPrescriptionWebSocketOptions {
    visionPrescription?: VisionPrescription;
    visionPrescriptionId?: string;
    isOpen?: boolean;
    onUpdate: (visionPrescription: VisionPrescription) => void;
    onDelete: () => void;
}

export const useFhirVisionPrescriptionTargetedBroadcast = ({
                                                               visionPrescription,
                                                               visionPrescriptionId,
                                                               isOpen = true,
                                                               onUpdate,
                                                               onDelete
                                                           }: UseVisionPrescriptionWebSocketOptions) => {
    const { subscribe, unsubscribe } = useWebSocketServiceContext();
    const { patientState } = usePatientServiceContext();

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

        const handleVisionPrescriptionEvent = (cloudEvent: any) => {
            const visionPrescriptionPayload: VisionPrescription = cloudEvent.data;
            const eventType = cloudEvent.type;

            const targetId = visionPrescriptionId || visionPrescription.id;

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

        subscribe('com.akashichealthrecords.fhir.visionprescription.updated', handleVisionPrescriptionEvent);
        subscribe('com.akashichealthrecords.fhir.visionprescription.deleted', handleVisionPrescriptionEvent);

        return () => {
            unsubscribe('com.akashichealthrecords.fhir.visionprescription.updated', handleVisionPrescriptionEvent);
            unsubscribe('com.akashichealthrecords.fhir.visionprescription.deleted', handleVisionPrescriptionEvent);
        };
    }, [patientState, visionPrescription, visionPrescriptionId, isOpen, onUpdate, onDelete, subscribe, unsubscribe]);
};