export default function ({
  isHMR,
  app,
  store,
  route,
  query,
  $cookies,
  error,
  redirect
}) {
  const defaultLocale = $cookies.get('lang') || app.i18n.fallbackLocale
  if (isHMR) {
    return
  }
  const locale = query.lang || defaultLocale
  if (!store.state.locales.includes(locale)) {
    return error({ message: 'This page could not be found.', statusCode: 404 })
  }
  
  store.commit('SET_LANG', locale)
  app.i18n.locale = store.state.locale
  
  if (locale === defaultLocale && route.fullPath.indexOf('/' + defaultLocale) === 0) {
    const toReplace =
      '^/' +
      defaultLocale +
      (route.fullPath.indexOf('/' + defaultLocale + '/') === 0 ? '/' : '')
    const re = new RegExp(toReplace)
    return redirect(route.fullPath.replace(re, '/'))
  }
}