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

interface UseEncounterWebSocketOptions {
    encounter?: Encounter;
    encounterId?: string;
    isOpen?: boolean;
    onUpdate: (encounter: Encounter) => void;
    onDelete: () => void;
}

export const useFhirEncounterTargetedBroadcast = ({
                                                      encounter,
                                                      encounterId,
                                                      isOpen = true,
                                                      onUpdate,
                                                      onDelete
                                                  }: UseEncounterWebSocketOptions) => {
    const { subscribe, unsubscribe } = useWebSocketServiceContext();
    const { patientState } = usePatientServiceContext();

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

        const handleEncounterEvent = (cloudEvent: any) => {
            const encounterPayload: Encounter = cloudEvent.data;
            const eventType = cloudEvent.type;

            const targetId = encounterId || encounter.id;

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

        subscribe('com.akashichealthrecords.fhir.encounter.updated', handleEncounterEvent);
        subscribe('com.akashichealthrecords.fhir.encounter.deleted', handleEncounterEvent);

        return () => {
            unsubscribe('com.akashichealthrecords.fhir.encounter.updated', handleEncounterEvent);
            unsubscribe('com.akashichealthrecords.fhir.encounter.deleted', handleEncounterEvent);
        };
    }, [patientState, encounter, encounterId, isOpen, onUpdate, onDelete, subscribe, unsubscribe]);
};