import type { Appointment, Location } from 'fhir/r4';
import { isVirtualLocation } from '../../../utils/roomLocation';

export interface AppointmentWhere {
    label: string;
    virtual: boolean;
}

/** Where a visit happens, from the practice Locations it names; nothing when none is known. */
export const appointmentWhere = (appointment: Appointment, locations: Location[]): AppointmentWhere | undefined => {
    const named = (appointment.participant ?? [])
        .map((participant) => participant.actor?.reference)
        .filter((reference): reference is string => Boolean(reference?.startsWith('Location/')))
        .map((reference) => locations.find((location) => location.id === reference.slice('Location/'.length)))
        .filter((location): location is Location => Boolean(location));
    const virtual = named.find(isVirtualLocation);
    if (virtual) return { label: 'Telehealth', virtual: true };
    const site = named.find((location) => Boolean(location.name?.trim()));
    return site ? { label: (site.name as string).trim(), virtual: false } : undefined;
};