import type { QuestionnaireResponse } from 'fhir/r4';

// Written by the server on a response's first successful send and kept across amendments.
const FIRST_SUBMITTED_EXTENSION_URL =
    'https://akashichealthrecords.com/fhir/StructureDefinition/questionnaire-response-first-submitted';

/**
 * When the patient first sent this response, from the server's record only. `authored` moves with every
 * amendment and the page's history read cannot prove a response was never amended, so without the record
 * the time stays unknown.
 */
export const submittedAtOf = (response: QuestionnaireResponse | undefined): string | undefined =>
    response?.extension?.find((ext) => ext.url === FIRST_SUBMITTED_EXTENSION_URL)?.valueDateTime;