import assert from 'node:assert/strict';
import { test } from 'node:test';

import {
  DEFAULT_LOCALE,
  createTranslator,
  normalizeLocale,
  supportedLocales
} from '../src/frontend/i18n/index.js';

test('uses Chinese as the default locale and normalizes supported aliases', () => {
  assert.equal(DEFAULT_LOCALE, 'zh-CN');
  assert.deepEqual(supportedLocales, ['zh-CN', 'en-US']);
  assert.equal(normalizeLocale(), 'zh-CN');
  assert.equal(normalizeLocale('zh'), 'zh-CN');
  assert.equal(normalizeLocale('en'), 'en-US');
  assert.equal(normalizeLocale('fr-FR'), 'zh-CN');
});

test('translates known UI keys and falls back safely', () => {
  const zh = createTranslator('zh-CN');
  const en = createTranslator('en-US');

  assert.equal(zh('common.refresh'), '刷新');
  assert.equal(en('common.refresh'), 'Refresh');
  assert.equal(zh('auth.loginTitle'), '登录控制台');
  assert.equal(en('auth.loginTitle'), 'Sign in to console');
  assert.equal(en('missing.translation.key'), 'missing.translation.key');
});