edr-platform/apps/edr-payment-api/src/modules/cbe-bill/mappers/cbe-error.mapper.ts

import { CbeFailureClass } from "../entities/cbe-bill-operation.entity";

/**
 * A CBE business/transport outcome we detected ourselves. `failureClass` drives the §6.5
 * same-End_To_End_Txn_Id retry policy: BUSINESS outcomes are final (retrying cannot change
 * the answer), TRANSIENT ones (our 5xx, domain app unreachable) may be retried by CBE.
 */
export class CbeBillError extends Error {
  constructor(
    message: string,
    readonly failureClass: CbeFailureClass,
  ) {
    super(message);
    this.name = "CbeBillError";
  }
}

/**
 * Every failure maps to Response_Code "2" (per current CBE integration requirement; the
 * original AAFDA plan used 3); only the description is specific (plan §6.6).
 */
export function toCbeFailure(err: unknown): {
  description: string;
  failureClass: CbeFailureClass;
} {
  if (err instanceof CbeBillError) {
    return { description: err.message, failureClass: err.failureClass };
  }
  return { description: "Internal error", failureClass: "TRANSIENT" };
}