/**
 * app/api/siax-error-mapping.ts — shared error mapper for the LEGACY routes
 * outside the /api/0pt matcher (`app/api/orders*`, `/subscriptions`,
 * `/payments/*`, `/webhooks/stripe`, `/admin/metrics`).
 *
 * 0pt#53: `getSqlForDurableStore` (lib/db.ts) throws
 * `SiaxError("DEPENDENCY_UNAVAILABLE")` (httpStatus 503, retryable) when a
 * money-bearing store would otherwise fall back to an in-memory Map in a
 * production runtime. The /api/0pt/* surface already maps that error via
 * src/http/siax-error-response.ts; these legacy routes did not, so the
 * documented 503 DEPENDENCY_UNAVAILABLE leaked as Next's opaque 500.
 *
 * The helpers preserve each route's OWN typed error contract
 * (IdempotencyKeyConflictError -> 409, etc.) and only ADD the SiaxError
 * branch — a plain rethrow is deliberately avoided because App Router turns
 * any uncaught thrown SiaxError into a generic 500 with no error body.
 */
import { NextResponse } from "next/server";
import { SiaxError } from "@/src/platform/errors";

export function isSiaxError(error: unknown): error is SiaxError {
  return error instanceof SiaxError;
}

/** Map a caught error to a NextResponse: SiaxError -> its pinned status/body. */
export function siaxErrorResponseForLegacy(error: SiaxError): NextResponse {
  return NextResponse.json(error.toJSON(), { status: error.httpStatus });
}