/** Helpers i18n — langue UI Chrome (chrome.i18n.getUILanguage). */
function t(key, ...subs) {
  const msg = chrome.i18n.getMessage(key, subs)
  return msg || key
}

function uiLocaleTag() {
  return (chrome.i18n.getUILanguage() || 'en').replace('_', '-').split('-')[0]
}

function isUiRtl() {
  return ['ar', 'fa', 'he', 'ur'].includes(uiLocaleTag())
}

function applyDocumentLocale() {
  const lang = uiLocaleTag()
  document.documentElement.lang = lang
  document.documentElement.dir = isUiRtl() ? 'rtl' : 'ltr'
  document.body?.classList.toggle('ui-rtl', isUiRtl())
}

function applyShellI18n() {
  document.title = t('extName')
  const brandSub = document.querySelector('.brand-sub')
  if (brandSub) brandSub.textContent = t('webClipper')
  if (typeof els !== 'undefined' && els.connLabel) {
    els.connLabel.textContent = t('connected')
  }
  if (typeof els !== 'undefined' && els.settingsBtn) {
    els.settingsBtn.title = t('instanceSettings')
    els.settingsBtn.setAttribute('aria-label', t('instanceSettings'))
  }
  const urlLabel = document.getElementById('instanceUrlLabel') || document.querySelector('#settingsPanel .field > span')
  if (urlLabel) urlLabel.textContent = t('instanceUrlLabel')
  const presetProd = document.querySelector('[data-url="https://memento-note.com"]')
  if (presetProd) presetProd.textContent = t('presetProduction')
  if (typeof els !== 'undefined' && els.applyInstanceBtn) {
    els.applyInstanceBtn.textContent = t('applyReconnect')
  }
  if (typeof els !== 'undefined' && els.openLoginBtn) {
    els.openLoginBtn.textContent = `${t('openMomento')} ↗`
  }
  const hint = document.querySelector('.settings-hint')
  if (hint) hint.textContent = t('settingsHint')
  const footer = document.querySelector('.footer-meta')
  if (footer) footer.textContent = t('footerVersion')
}