/**
 * The reserved-namespace predicate, in isolation.
 *
 * It is one `startsWith`, but it is the seam that keeps the polyfill's emulated
 * branches out of the consumer's data (see `machinery.ts`), so its edges are worth
 * pinning: get it wrong in one direction and machinery leaks into domain properties;
 * wrong in the other and real data silently disappears from reads.
 */
import { test, expect } from "bun:test";
import { MACHINERY_NS, isMachinerySubject } from "../src/machinery";

test("the emulated branch subjects are all machinery", () => {
  // The four compartments store-registry emulates, verbatim.
  for (const s of [
    "urn:ng-eventually:shim:index",
    "urn:ng-eventually:shim:storeBranch",
    "urn:ng-eventually:shim:userBranch",
    "urn:ng-eventually:shim:headerBranch",
  ]) {
    expect(isMachinerySubject(s)).toBe(true);
  }
});

test("inbox deposits are machinery too — a second prefix under the same namespace", () => {
  expect(isMachinerySubject("urn:ng-eventually:inbox:deposit:1700:abc")).toBe(true);
});

test("consumer subjects are not machinery — including a NURI, which is what entities use", () => {
  expect(isMachinerySubject("did:ng:o:doc1")).toBe(false);
  expect(isMachinerySubject("urn:e2e:secret")).toBe(false);
  expect(isMachinerySubject("http://example.org/thing")).toBe(false);
});

test("a look-alike prefix is NOT machinery — the boundary is exact, not fuzzy", () => {
  // Anything that merely resembles the namespace must fall on the data side, or a
  // consumer's own vocabulary could vanish from its reads.
  expect(isMachinerySubject("urn:ng-eventuallyX:thing")).toBe(false);
  expect(isMachinerySubject("urn:ng-event:thing")).toBe(false);
  expect(isMachinerySubject("x-urn:ng-eventually:shim:index")).toBe(false);
});

test("an absent subject is not machinery — read paths hand bindings straight in", () => {
  expect(isMachinerySubject(undefined)).toBe(false);
  expect(isMachinerySubject("")).toBe(false);
});

test("the namespace is the prefix both writers actually use", () => {
  // Guards against the constant drifting away from store-registry/inbox.
  expect("urn:ng-eventually:shim".startsWith(MACHINERY_NS)).toBe(true);
  expect("urn:ng-eventually:inbox".startsWith(MACHINERY_NS)).toBe(true);
});