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

interface UseDeviceRequestWebSocketOptions {
    deviceRequest?: DeviceRequest;
    deviceRequestId?: string;
    isOpen?: boolean;
    onUpdate: (deviceRequest: DeviceRequest) => void;
    onDelete: () => void;
}

export const useFhirDeviceRequestTargetedBroadcast = ({
                                                          deviceRequest,
                                                          deviceRequestId,
                                                          isOpen = true,
                                                          onUpdate,
                                                          onDelete
                                                      }: UseDeviceRequestWebSocketOptions) => {
    const { subscribe, unsubscribe } = useWebSocketServiceContext();
    const { patientState } = usePatientServiceContext();

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

        const handleDeviceRequestEvent = (cloudEvent: any) => {
            const deviceRequestPayload: DeviceRequest = cloudEvent.data;
            const eventType = cloudEvent.type;

            const targetId = deviceRequestId || deviceRequest.id;

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

        subscribe('com.akashichealthrecords.fhir.devicerequest.updated', handleDeviceRequestEvent);
        subscribe('com.akashichealthrecords.fhir.devicerequest.deleted', handleDeviceRequestEvent);

        return () => {
            unsubscribe('com.akashichealthrecords.fhir.devicerequest.updated', handleDeviceRequestEvent);
            unsubscribe('com.akashichealthrecords.fhir.devicerequest.deleted', handleDeviceRequestEvent);
        };
    }, [patientState, deviceRequest, deviceRequestId, isOpen, onUpdate, onDelete, subscribe, unsubscribe]);
};