import type { ServiceRequest } from "fhir/r4";

/**
 * The result waiting on an order, read from the order itself.
 *
 * The server writes this exact URL and the plugin reads it back, so the literal has to match byte for
 * byte -- the same contract every other Akashic extension the client reads carries.
 *
 * WHY IT IS ON THE ORDER AT ALL. A worklist that has to show "a result is waiting" searches orders,
 * and reading a report per row to find out would cost a request per row. The report is the truth about
 * the result; this says only that one exists, and names it.
 */

export const RESULT_ENTERED_EXTENSION_URL =
  "https://akashichealthrecords.com/fhir/StructureDefinition/result-entered";

/** The report filed against an order, or undefined when nothing has been filed yet. */
/** The report reference exactly as the order names it, for a reader that must check its form. */
export const readEnteredReportReference = (order: ServiceRequest): string | undefined =>
  (order.extension ?? [])
    .find((e) => e.url === RESULT_ENTERED_EXTENSION_URL)
    ?.extension?.find((e) => e.url === "report")?.valueReference?.reference;

export const readEnteredReportId = (order: ServiceRequest): string | undefined => {
  const found = (order.extension ?? []).find((e) => e.url === RESULT_ENTERED_EXTENSION_URL);

  return (found?.extension ?? [])
    .find((e) => e.url === "report")?.valueReference?.reference?.split("/")
    .pop();
};