// tests/kb-update/test-audit-corpus-headers.test.mjs
// Spor 1 Step 1 — the read-only corpus-header audit that pins the migration's
// empirical ground truth: which files carry a stale (non-date) **Verified:**,
// which have a body-duplicate or pipe-delimited shape, which lack the English
// **Last updated:** / **Status:** base fields, and which header dialect each uses.
//
// auditHeaders is a pure function with an injectable reader (validate-kb-file.mjs
// pattern), so these tests never touch disk — synthetic fixtures only.

import { test } from 'node:test';
import assert from 'node:assert/strict';
import { auditHeaders } from '../../scripts/kb-update/audit-corpus-headers.mjs';

// Stale verified: value is "MCP <date>", not a clean date. Norwegian dialect,
// no English **Last updated:** (the 45-file shape).
const V_NONDATE =
  '# T\n\n**Kategori:** governance\n**Status:** GA\n**Sist oppdatert:** 2026-06\n' +
  '**Verified:** MCP 2026-06\n\n---\n\n## A\n\ntekst\n';

// Clean date verified: must NOT be flagged stale.
const V_DATE =
  '# T\n\n**Category:** governance\n**Status:** GA\n**Last updated:** 2026-06\n' +
  '**Verified:** 2026-06\n\n---\n\n## A\n\ntekst\n';

// Body-duplicate: a second **Verified:** below the first `---` but still inside
// the 500-byte header window (the mlops-fundamentals-overview.md:10 shape).
const V_BODYDUP =
  '# T\n\n**Status:** GA\n**Last updated:** 2026-06\n**Verified:** MCP 2026-06\n\n---\n\n' +
  '## A\n\n**Verified:** MCP 2026-06\n\ntekst\n';

// Pipe-delimited meta row (the ai-center-of-excellence-setup.md:4 shape).
const V_PIPE =
  '# T\n\n**Sist oppdatert:** 2026-06-17 | **Verified:** MCP 2026-06-17\n\n---\n\n' +
  '## A\n\ntekst\n';

// Base-field gap: no **Status:** at all.
const NO_STATUS =
  '# T\n\n**Category:** x\n**Last updated:** 2026-06\n\n---\n\n## A\n\ntekst\n';

// Fully conformant, no Verified — the quiet majority.
const CLEAN =
  '# T\n\n**Category:** x\n**Status:** GA\n**Last updated:** 2026-06\n\n---\n\n## A\n\ntekst\n';

function reader(map) {
  return (p) => {
    if (!(p in map)) throw new Error(`unexpected read: ${p}`);
    return map[p];
  };
}

test('auditHeaders — non-date **Verified:** MCP is flagged stale (isDate:false)', () => {
  const r = auditHeaders(['a.md'], reader({ 'a.md': V_NONDATE }));
  const f = r.files['a.md'];
  assert.ok(f.verified, 'verified header detected');
  assert.equal(f.verified.isDate, false);
  assert.equal(f.verified.value, 'MCP 2026-06');
  assert.equal(r.aggregate.verifiedNonDate, 1);
  assert.equal(r.aggregate.verifiedDate, 0);
});

test('auditHeaders — clean date **Verified:** is NOT flagged stale', () => {
  const r = auditHeaders(['b.md'], reader({ 'b.md': V_DATE }));
  const f = r.files['b.md'];
  assert.ok(f.verified);
  assert.equal(f.verified.isDate, true);
  assert.equal(r.aggregate.verifiedNonDate, 0);
  assert.equal(r.aggregate.verifiedDate, 1);
});

test('auditHeaders — body-duplicate within 500B is flagged separately from the header hit', () => {
  const r = auditHeaders(['c.md'], reader({ 'c.md': V_BODYDUP }));
  const f = r.files['c.md'];
  assert.ok(f.verified);
  assert.equal(f.verified.duplicateWithinHeaderRegion, true);
  assert.equal(r.aggregate.verifiedDuplicate, 1);
  // the single-occurrence fixtures must not trip the duplicate flag
  const r2 = auditHeaders(['a.md'], reader({ 'a.md': V_NONDATE }));
  assert.equal(r2.files['a.md'].verified.duplicateWithinHeaderRegion, false);
});

test('auditHeaders — pipe-delimited **Verified:** row is flagged pipe, value stops at the separator', () => {
  const r = auditHeaders(['d.md'], reader({ 'd.md': V_PIPE }));
  const f = r.files['d.md'];
  assert.ok(f.verified);
  assert.equal(f.verified.pipe, true);
  assert.equal(f.verified.value, 'MCP 2026-06-17');
  assert.equal(f.verified.isDate, false);
  assert.equal(r.aggregate.verifiedPipe, 1);
  assert.equal(f.dialect, 'pipe');
});

test('auditHeaders — Norwegian **Sist oppdatert:** does not satisfy the English Last-updated check', () => {
  const r = auditHeaders(['a.md'], reader({ 'a.md': V_NONDATE }));
  const f = r.files['a.md'];
  assert.equal(f.lastUpdatedEnglish, false);
  assert.equal(r.aggregate.missingEnglishLastUpdated, 1);
  assert.equal(f.dialect, 'kategori');
});

test('auditHeaders — missing **Status:** is flagged', () => {
  const r = auditHeaders(['e.md'], reader({ 'e.md': NO_STATUS }));
  const f = r.files['e.md'];
  assert.equal(f.status, false);
  assert.equal(r.aggregate.missingStatus, 1);
  assert.equal(f.dialect, 'category');
});

test('auditHeaders — conformant file raises no flags; aggregate counts add up over a batch', () => {
  const map = {
    'a.md': V_NONDATE, 'b.md': V_DATE, 'c.md': V_BODYDUP,
    'd.md': V_PIPE, 'e.md': NO_STATUS, 'f.md': CLEAN,
  };
  const r = auditHeaders(Object.keys(map), reader(map));
  assert.equal(r.aggregate.files, 6);
  const clean = r.files['f.md'];
  assert.equal(clean.verified, null);
  assert.equal(clean.title, true);
  assert.equal(clean.status, true);
  assert.equal(clean.lastUpdatedEnglish, true);
  // a/c/d carry a non-date verified; b is the only clean date
  assert.equal(r.aggregate.verifiedPresent, 4);
  assert.equal(r.aggregate.verifiedNonDate, 3);
  assert.equal(r.aggregate.verifiedDate, 1);
  // e has no Status; d's pipe row carries no Status either
  assert.equal(r.aggregate.missingStatus, 2);
  // a (Sist oppdatert) and d (pipe row, no English Last updated) lack the English field
  assert.equal(r.aggregate.missingEnglishLastUpdated, 2);
  assert.equal(r.aggregate.missingTitle, 0);
});

test('auditHeaders — an unreadable file is reported, not thrown', () => {
  const r = auditHeaders(['x.md'], () => { throw new Error('ENOENT'); });
  assert.equal(r.files['x.md'].error !== undefined, true);
  assert.equal(r.aggregate.files, 1);
  assert.equal(r.aggregate.readErrors, 1);
});