// tests/lib/fix-round-4-5b-part-3-prose.test.mjs
// Prose pins for fix round 4-5b, part 3 (plan
// .claude/projects/2026-10-28-fix-round-4-5b-part-3, decision 89): the fixes
// that are text a session reads. The tag in brackets is the part-3 id from the
// round's brief; the tagged test fails on an assertion at ce98f62, part 2's end
// point. The keep-behaviour checks sit inside the tagged test as "Control:"
// assertions.
//   KI3  the CHANGELOG lists part 3's fixes (CQW, PQO) under ### Fixed, its
//        door under ### Doors, the review's other two MAJOR (`3b98d18b`,
//        `69b086eb`) and the typed arguments the guard now refuses under
//        ### Known issues, and the tokenizer Known-issues line says exactly
//        what is left and when the operator accepted it.
// No static import of a new export: the file must load at ce98f62.
// Fix the SOURCE a pin guards, not the pin.

import { test } from 'node:test';
import { strict as assert } from 'node:assert';
import { existsSync, readFileSync } from 'node:fs';
import { dirname, join } from 'node:path';
import { fileURLToPath } from 'node:url';

const ROOT = join(dirname(fileURLToPath(import.meta.url)), '..', '..');

const readCache = new Map();

/** A repo file's text; the file must exist. Read from disk once per run. */
function read(rel) {
  if (!readCache.has(rel)) {
    assert.ok(existsSync(join(ROOT, rel)), `missing file ${rel}`);
    readCache.set(rel, readFileSync(join(ROOT, rel), 'utf8'));
  }
  return readCache.get(rel);
}

/** Whitespace (line breaks too) collapsed to one space. */
const flat = (s) => s.replace(/\s+/g, ' ').trim();

// --- KI3: the round's CHANGELOG entry ----------------------------------------------
// Part 3 stands in the same Unreleased section as parts 1 and 2. The section is
// found by its title, by the rule tests/lib/fix-round-4-5b-part-2-prose.test.mjs
// uses (copied, not imported): `## Unreleased — <title>` before the release,
// `## vX.Y.Z — <date> — <title>` after it, exactly once, up to the next `## `.

const CHANGELOG_TITLE = "The annotating skill, the run coupling and P10's model-free part";
const CHANGELOG_HEADING = new RegExp(`^## (?:Unreleased|v\\d+\\.\\d+\\.\\d+ — \\d{4}-\\d{2}-\\d{2}) — ${CHANGELOG_TITLE.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')}$`);

/** The lines of the round's CHANGELOG section, heading excluded. */
function changelogSection() {
  const lines = read('CHANGELOG.md').split('\n');
  const at = [];
  lines.forEach((l, i) => { if (CHANGELOG_HEADING.test(l.replace(/\s+$/, ''))) at.push(i); });
  assert.equal(at.length, 1, `CHANGELOG.md must hold the "${CHANGELOG_TITLE}" section exactly once (found ${at.length})`);
  let end = lines.length;
  for (let i = at[0] + 1; i < lines.length; i++) if (/^## /.test(lines[i])) { end = i; break; }
  return lines.slice(at[0] + 1, end);
}

/** The bullets of one `### ` subsection of the round's CHANGELOG section, each flattened to one line. */
function changelogBullets(heading) {
  const lines = changelogSection();
  const s = lines.findIndex((l) => l.replace(/\s+$/, '') === heading);
  assert.ok(s !== -1, `the "${CHANGELOG_TITLE}" section of CHANGELOG.md must have "${heading}"`);
  const out = [];
  for (const l of lines.slice(s + 1)) {
    if (/^### /.test(l)) break;
    if (/^- /.test(l)) out.push(l);
    else if (out.length && l.trim() !== '' && /^\s/.test(l)) out[out.length - 1] += ` ${l}`;
    else if (l.trim() !== '') out.push('');
  }
  return out.filter((b) => b !== '').map(flat);
}

// The review's two MAJOR findings part 3 leaves open, and the two it fixes; the
// ids are the review's, written out here.
const OPEN_IDS = ['3b98d18b', '69b086eb'];
const FIXED_IDS = ['87a693f0', '021996c6'];

test('[KI3] the CHANGELOG lists part 3\'s fixes, the review\'s other two MAJOR and the corrected tokenizer line', () => {
  const known = changelogBullets('### Known issues');

  // Red: each open finding has exactly one Known-issues bullet, and that bullet names decision 89.
  for (const id of OPEN_IDS) {
    const hits = known.filter((b) => b.includes(id));
    assert.equal(hits.length, 1, `### Known issues must hold exactly one bullet naming ${id}; found ${hits.length}`);
    assert.ok(hits[0].includes('decision 89'), `the Known-issues bullet naming ${id} does not say decision 89: ${hits[0]}`);
  }

  // Red: the typed arguments the guard now refuses have one Known-issues bullet.
  const refused = known.filter((b) => b.includes("<<$'\\t'"));
  assert.equal(refused.length, 1, `### Known issues must hold exactly one bullet naming the typed argument <<$'\\t'; found ${refused.length}`);

  // Red: the tokenizer bullet says what is left and when the operator accepted it.
  const tok = known.filter((b) => b.includes("'90s"));
  assert.equal(tok.length, 1, `### Known issues must hold exactly one bullet holding '90s; found ${tok.length}`);
  for (const part of ['say "hi"', 'x --since ', '2026-10-27', '2026-10-28']) {
    assert.ok(tok[0].includes(part), `the tokenizer Known-issues bullet must hold ${JSON.stringify(part)}: ${tok[0]}`);
  }
  for (const gone of ['"a "', 'accepted these']) {
    assert.ok(!tok[0].includes(gone), `the tokenizer Known-issues bullet must no longer hold ${JSON.stringify(gone)}: ${tok[0]}`);
  }

  // Red elsewhere: one ### Fixed bullet per part-3 id, each naming its review
  // finding, and a door for the round.
  const fixed = changelogBullets('### Fixed');
  for (const [tag, id] of [['(CQW)', '87a693f0'], ['(PQO)', '021996c6']]) {
    const hits = fixed.filter((b) => b.includes(tag));
    assert.equal(hits.length, 1, `### Fixed must hold exactly one bullet marked ${tag}; found ${hits.length}`);
    assert.ok(hits[0].includes(id), `the ### Fixed bullet marked ${tag} must name review finding ${id}: ${hits[0]}`);
  }
  const doors = changelogBullets('### Doors').filter((b) => b.includes('decision 89'));
  assert.equal(doors.length, 1, `### Doors must hold one bullet naming decision 89; found ${doors.length}`);

  // Control: no fixed finding is listed as open.
  for (const id of FIXED_IDS) {
    assert.deepEqual(known.filter((b) => b.includes(id)), [], `Control: the fixed finding ${id} must not stand under ### Known issues`);
  }
});