#!/usr/bin/env node
/**
 * verify-i18n.mjs — static checks for the documentation site's zh-CN/en switch.
 * No runtime dependencies; exits non-zero when a source key is missing or a
 * module-level translated value can go stale after a language change.
 */
import { readFileSync, existsSync } from 'node:fs';
import { join } from 'node:path';

const ROOT = join(import.meta.dirname, '..');
const appPath = join(ROOT, 'site', 'app.js');
const i18nPath = join(ROOT, 'site', 'i18n.js');
const indexPath = join(ROOT, 'site', 'index.html');
const app = readFileSync(appPath, 'utf8');
const i18n = readFileSync(i18nPath, 'utf8');
const index = readFileSync(indexPath, 'utf8');

const failures = [];
const checks = [];
function check(name, ok, detail = '') {
  checks.push({ name, ok, detail });
  if (!ok) failures.push(`${name}${detail ? `: ${detail}` : ''}`);
}

check('dictionary exists', /var\s+EN\s*=\s*\{/.test(i18n));
check('language storage key', /LANG_KEY\s*=\s*['"]kole-lang['"]/.test(i18n));
check('language values', /saved\s*===\s*['"]en['"]/.test(i18n) && /saved\s*===\s*['"]zh['"]/.test(i18n));
check('HTML lang sync', /setAttribute\(['"]lang['"],\s*lang\s*===\s*['"]en['"]\s*\?\s*['"]en['"]\s*:\s*['"]zh-CN['"]/.test(i18n));
check('language select markup', /id="lang-trigger"/.test(index) && /id="lang-menu"/.test(index)
  && /role="listbox"/.test(index) && /class="lang-opt"[^>]*data-lang="zh"/.test(index) && /class="lang-opt"[^>]*data-lang="en"/.test(index));
check('language select binding', /function\s+bindLangSelect\s*\(/.test(app)
  && /function\s+applyLang\(next\)[\s\S]*?I18N\.setLang\(next\)/.test(app)
  && /applyLang\(opt\.getAttribute\(['"]data-lang['"]\)\)/.test(app));
check('no legacy lang toggle left', !/lang-toggle/.test(index) && !/bindLangToggle/.test(app) && !/\.lang-zh\b/.test(index));
check('English document title', /Kole UI · Component Library/.test(app));
check('source-key navigation map', /var\s+NAV_KEY\s*=\s*\{[^}]*home:\s*['"]首页['"]/.test(app));
check('search stores category key', /return\s*\{\s*c:\s*c,[\s\S]*?category:\s*c\.category\s*\}/.test(app));
check('related translations evaluated at render', /why:\s*T\(rule\.why\)/.test(app));
check('theme labels evaluated at render', /function\s+themeMeta\s*\(\)[\s\S]*?T\(m\[1\]\)/.test(app));
check('theme presets evaluated at render', /function\s+themePresets\s*\(\)[\s\S]*?T\(p\.label\)/.test(app));
const relatedDecl = app.match(/var\s+RELATED_MAP\s*=\s*\[[\s\S]*?\n\s*\];/);
const themeDecl = app.match(/var\s+THEME_META_KEYS\s*=\s*\[[\s\S]*?\n\s*\];/);
check('no stale module-level translated caches', !(relatedDecl && /\bT\s*\(/.test(relatedDecl[0])) && !(themeDecl && /\bT\s*\(/.test(themeDecl[0])));

const dictBlock = i18n.match(/var\s+EN\s*=\s*\{([\s\S]*?)\n\s*\};/);
const dictionaryKeys = new Set();
if (dictBlock) {
  for (const match of dictBlock[1].matchAll(/^\s*(['"])((?:\\.|(?!\1)[\s\S])*?)\1\s*:/gm)) {
    dictionaryKeys.add(match[2].replace(/\\(['"])/g, '$1'));
  }
}
const sourceKeys = new Set();
for (const match of app.matchAll(/\bT\(\s*(['"])((?:\\.|(?!\1)[\s\S])*?)\1\s*\)/g)) {
  sourceKeys.add(match[2].replace(/\\(['"])/g, '$1'));
}
const missing = [...sourceKeys].filter((key) => !dictionaryKeys.has(key));
check('literal T() coverage', missing.length === 0, missing.length ? missing.join(' | ') : `${sourceKeys.size} keys covered`);

const detailDir = join(ROOT, 'site', 'details');
check('detail payload directory', existsSync(detailDir));

for (const result of checks) {
  console.log(`[i18n] ${result.ok ? 'OK' : 'FAIL'} ${result.name}${result.detail ? ` — ${result.detail}` : ''}`);
}
if (failures.length) {
  console.error(`\n[i18n] ${failures.length} check(s) failed`);
  process.exit(1);
}
console.log(`\n[i18n] OK — ${checks.length} checks passed`);