// The side table a page keeps its frames' bindings in (WAI browser-sink §9.2), held to the
// sequences of live-conformance/browser (`node --test web/room/binding.test.mjs`). The page runs
// the same sequences in the browser; here the frames and decoders are stand-in objects.
import test from "node:test";
import assert from "node:assert/strict";
import fs from "node:fs";
import { fileURLToPath } from "node:url";
import { runSequence, SideTable, chainToken } from "./binding.js";

const corpus = JSON.parse(fs.readFileSync(fileURLToPath(new URL("../../../../../../wai/live-conformance/browser/vectors.json", import.meta.url)), "utf8"));
// The bindings in the sequences are valid: their canonical form is their members in §7.1's order.
const canonicalOf = (b) => JSON.stringify({ alg: b.alg, digest: b.digest, ...(b.receipt ? { receipt: b.receipt } : {}), tier: b.tier });

for (const c of corpus.tables) {
  test(`side table: ${c.name}`, () => {
    const got = runSequence(c.bound, c.ops, canonicalOf);
    assert.deepEqual(got, c.result);
  });
}

test("a frame object is unbound until a decoder's output attaches an entry, and a struck entry binds nothing", () => {
  const t = new SideTable(4);
  const d = {};
  const f = { timestamp: 5 };
  assert.equal(SideTable.of(f), null);
  t.chunk(d, 5, { binding: "b" });
  t.chunk(d, 5, { binding: "c" });
  assert.equal(t.output(d, f), null);
  assert.deepEqual(t.refusals, [{ at: 1, reason: "binding_ambiguous" }]);
  // A binding that depends on the frame is computed when the frame is output.
  t.chunk(d, 6, { binding: (fr) => `tier-of-${fr.timestamp}` });
  assert.equal(t.output(d, { timestamp: 6 }).binding, "tier-of-6");
});

test("chain admissions read as §10's tokens", () => {
  assert.equal(chainToken("linked"), "linked");
  assert.equal(chainToken("already"), "linked");
  assert.equal(chainToken("anchor"), "anchor");
  assert.equal(chainToken("held:parent_not_held"), "held");
  assert.equal(chainToken("refused:chain_break"), "refused");
  assert.equal(chainToken(undefined), "held");
});