import * as assert from 'assert';
import { t, setLanguage, getLanguage, getMessageKeys, Language } from '../src/i18n/messages';

suite('I18n Tests', () => {
  test('all message keys have values for all three languages', () => {
    const languages: Language[] = ['zh-CN', 'en', 'ja'];
    const keys = getMessageKeys();

    for (const lang of languages) {
      setLanguage(lang);
      for (const key of keys) {
        const result = t(key);
        assert.ok(result, `Key "${key}" is empty for language "${lang}"`);
        assert.notStrictEqual(result, key, `Key "${key}" has no translation for language "${lang}"`);
      }
    }
  });

  test('default language is zh-CN', () => {
    setLanguage('zh-CN');
    assert.strictEqual(getLanguage(), 'zh-CN');
  });

  test('setLanguage changes current language', () => {
    setLanguage('en');
    assert.strictEqual(getLanguage(), 'en');
    setLanguage('ja');
    assert.strictEqual(getLanguage(), 'ja');
    setLanguage('zh-CN');
  });

  test('t() falls back to key when key does not exist', () => {
    setLanguage('zh-CN');
    const result = t('nonexistent.key');
    assert.strictEqual(result, 'nonexistent.key');
  });

  test('t() returns zh-CN string in zh-CN language', () => {
    setLanguage('zh-CN');
    assert.strictEqual(t('review.noEditor'), '请先打开一个文件');
  });

  test('t() returns English string in en language', () => {
    setLanguage('en');
    assert.strictEqual(t('review.noEditor'), 'Please open a file first');
  });

  test('t() returns Japanese string in ja language', () => {
    setLanguage('ja');
    assert.strictEqual(t('review.noEditor'), '最初にファイルを開いてください');
  });

  test('t() with template variables', () => {
    setLanguage('en');
    assert.strictEqual(
      t('export.saved', { 0: '/home/user/report.md' }),
      'Report saved to /home/user/report.md'
    );
  });

  test('t() with multiple template variables', () => {
    setLanguage('zh-CN');
    assert.strictEqual(
      t('report.totalSummary', { 0: '10', 1: '3', 2: '5', 3: '2' }),
      '总计: 10 | 错误: 3 | 警告: 5 | 建议: 2'
    );
  });

  teardown(() => {
    setLanguage('zh-CN');
  });
});