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

interface UseDocumentReferenceWebSocketOptions {
    documentReference?: DocumentReference;
    documentReferenceId?: string;
    isRoot?: boolean
    isOpen?: boolean;
    onUpdate: (documentReference: DocumentReference) => void;
    onDelete: () => void;
}

export const useFhirDocumentReferenceTargetedBroadcast = ({
                                                              documentReference,
                                                              documentReferenceId,
                                                              isRoot = false,
                                                              isOpen = true,
                                                              onUpdate,
                                                              onDelete
                                                          }: UseDocumentReferenceWebSocketOptions) => {
    const { subscribe, unsubscribe } = useWebSocketServiceContext();
    const { patientState } = usePatientServiceContext();

    useEffect(() => {
        if ((!patientState && !isRoot) || !documentReference || !isOpen) {
            return;
        }

        const handleDocumentReferenceEvent = (cloudEvent: any) => {
            const documentReferencePayload: DocumentReference = cloudEvent.data;
            const eventType = cloudEvent.type;

            const targetId = documentReferenceId || documentReference.id;

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

        subscribe('com.akashichealthrecords.fhir.documentreference.updated', handleDocumentReferenceEvent);
        subscribe('com.akashichealthrecords.fhir.documentreference.deleted', handleDocumentReferenceEvent);

        return () => {
            unsubscribe('com.akashichealthrecords.fhir.documentreference.updated', handleDocumentReferenceEvent);
            unsubscribe('com.akashichealthrecords.fhir.documentreference.deleted', handleDocumentReferenceEvent);
        };
    }, [patientState, documentReference, documentReferenceId, isOpen, onUpdate, onDelete, subscribe, unsubscribe]);
};