/**
 * DC-077: i18n route — serves translations and language metadata
 */
const express = require('express');
const { ok } = require('../src/utils/responses');
const i18n = require('../src/utilities/i18n');

module.exports = function() {
  const router = express.Router();

  // GET /api/v1/i18n/languages — list supported languages
  router.get('/i18n/languages', (req, res) => {
    ok(res, {
      languages: i18n.getSupportedLanguages().map(code => ({
        code,
        name: {
          en: 'English',
          es: 'Español',
          fr: 'Français',
          de: 'Deutsch',
          ar: 'العربية',
        }[code] || code,
        rtl: code === 'ar',
      })),
      default: i18n.DEFAULT_LANGUAGE,
    });
  });

  // GET /api/v1/i18n/translations/:lang — get all translations for a language
  router.get('/i18n/translations/:lang', (req, res) => {
    const lang = req.params.lang;
    if (!i18n.isSupported(lang)) {
      return res.status(400).json({
        success: false,
        error: `Unsupported language: ${lang}`,
        supported: i18n.getSupportedLanguages(),
      });
    }
    ok(res, { lang, translations: i18n.TRANSLATIONS[lang] || {} });
  });

  return router;
};