// Current test inventory, printed on demand.
//
// docs/STATUS.md used to carry these numbers inline; they went stale within a
// couple of releases while the version line next to them was kept current,
// which is worse than no number at all — a maintainer reading the snapshot
// underestimates the coverage that exists (review R5-2). The counts live here
// now, one command away, and STATUS.md describes the layers instead.
import { readdirSync, readFileSync } from 'node:fs';
import { join } from 'node:path';
import { METRIC_NAMES, collectMetrics, readBaseline } from './monolith-metrics.mjs';
import { MUTANTS } from './mutation-registry.mjs';
import {
  BROWSER_GUARD_LIMIT, browserGuardPolicy, readDocumentedBrowserGuards,
} from './mutation-browser-policy.mjs';
import { isMainModule } from './spawn-portable.mjs';

const count = (root, dir, match, re) =>
  readdirSync(join(root, dir))
    .filter((f) => match.test(f))
    .reduce((n, f) => n + (readFileSync(join(root, dir, f), 'utf8').match(re) || []).length, 0);

const files = (root, dir, match) => readdirSync(join(root, dir)).filter((f) => match.test(f)).length;

/**
 * Счётчики тестов по слоям. Один источник для этого отчёта и для таблицы
 * Snapshot в docs/STATUS.md (`scripts/status-snapshot.mjs`, #634).
 *
 * Count both node:test spellings and indented pytest methods. Pure backend
 * includes validation plus trail helper/recorder tests; only `test_ha_*` needs
 * the Home Assistant harness (AUD-159B7-03).
 */
export function testInventory(root = process.cwd()) {
  return [
    { id: 'node', label: 'Node unit (frontend + tooling)', count: count(root, 'test', /\.test\.mjs$/, /^\s*(test|it)\(/gm) },
    { id: 'backend-pure', label: 'pure backend (pytest, no HA)', count: count(root, 'tests_backend', /^test_(?!ha_).*\.py$/, /^\s*(?:async\s+)?def test_/gm) },
    { id: 'backend-ha', label: 'HA-harness backend (CI, py3.13)', count: count(root, 'tests_backend', /^test_ha_.*\.py$/, /^\s*(?:async\s+)?def test_/gm) },
    { id: 'smokes', label: 'browser smokes (headless chromium)', count: files(root, 'demo', /^smoke_.*\.mjs$/) },
  ];
}

if (isMainModule(import.meta.url)) {
  const rows = testInventory().map(({ label, count: n }) => [label, n]);
  const w = Math.max(...rows.map(([n]) => n.length));
  for (const [name, n] of rows) console.log(`${name.padEnd(w)}  ${n}`);

  const browser = browserGuardPolicy(MUTANTS, readDocumentedBrowserGuards(process.cwd()));
  console.log(`\nmutation browser guards  ${browser.count}/${BROWSER_GUARD_LIMIT}`);
  if (browser.missingReasons.length || browser.staleReasons.length) {
    console.log(`mutation browser inventory drift  +${browser.missingReasons.length} / -${browser.staleReasons.length}`);
  }

  // #624: связность монолита — те же шесть чисел и тот же модуль, что у гейта
  // `npm run lint:unused` («одно число — один источник»); рядом — база, чтобы
  // движение было видно без git blame. bundleBytes есть только после сборки.
  const { metrics } = collectMetrics(process.cwd());
  const baseline = readBaseline(process.cwd()) || {};
  console.log('\nmonolith (scripts/monolith-metrics.mjs; база scripts/monolith-baseline.json)');
  const mw = Math.max(...METRIC_NAMES.map((n) => n.length));
  for (const name of METRIC_NAMES) {
    const now = metrics[name];
    const base = baseline[name];
    const delta = now != null && base != null && now !== base ? ` (${now > base ? '+' : ''}${now - base} к базе ${base})` : '';
    console.log(`${name.padEnd(mw)}  ${now ?? 'n/a — npm run build'}${delta}`);
  }
}