const logger = require('logger-sharelatex')
function setLangBasedOnDomainMiddleware(req, res, next) {
  // Determine language from subdomain
  const lang = availableHosts.get(req.headers.host)
  if (lang) {
    req.i18n.changeLanguage(lang)
  }
// add this line !!!!!!!
  logger.log(`host: ${req.headers.host}, lang: ${lang}`)

  // expose the language code to pug
  res.locals.currentLngCode = req.language

  // If the set language is different from the language detection (based on
  // the Accept-Language header), then set flag which will show a banner
  // offering to switch to the appropriate library
  const detectedLanguageCode = headerLangDetector.detect(req, res)
  if (req.language !== detectedLanguageCode) {
    res.locals.suggestedLanguageSubdomainConfig = subdomainConfigs.get(
      detectedLanguageCode
    )
  }

  // Decorate req.i18n with translate function alias for backwards
  // compatibility usage in requests
  req.i18n.translate = req.i18n.t
  next()
}