import type { CodeableConcept, Reference } from "fhir/r4";

const named = (value: string | undefined) => value?.trim() || undefined;

/**
 * The medicine a medication order or statement records by name: its concept's text, then a coding's display, then the
 * display given with a referenced Medication. Undefined when none names it; a reference or id is never a name.
 */
export const medicationNameOf = (
    record: { medicationCodeableConcept?: CodeableConcept; medicationReference?: Reference } | undefined,
): string | undefined =>
    named(record?.medicationCodeableConcept?.text)
    ?? record?.medicationCodeableConcept?.coding?.map((coding) => named(coding.display)).find(Boolean)
    ?? named(record?.medicationReference?.display);