import { createI18n } from 'vue-i18n';

// Start with English synchronously to avoid FOUC; other locales lazy-loaded
async function loadLocaleMessages(locale: string) {
  const norm = locale.replace('-', '_');
  switch (norm) {
    case 'de':
      return (await import('./de.json')).default;
    case 'es':
      return (await import('./es.json')).default;
    case 'pt_BR':
    case 'pt-br':
      return (await import('./pt_BR.json')).default;
    case 'tr':
      return (await import('./tr.json')).default;
    case 'pl':
      return (await import('./pl.json')).default;
    default:
      return (await import('./en.json')).default;
  }
}

export const i18n = createI18n({
  legacy: false,
  locale: 'en',
  fallbackLocale: 'en',
  messages: {},
});

export async function initI18n(startLocale: string) {
  const msgs = await loadLocaleMessages(startLocale || 'en');
  i18n.global.setLocaleMessage(startLocale || 'en', msgs);
  i18n.global.locale.value = startLocale || 'en';
}

export async function setLocale(locale: string) {
  const norm = locale.replace('-', '_');
  if (!i18n.global.getLocaleMessage(norm) || Object.keys(i18n.global.getLocaleMessage(norm)).length === 0) {
    const msgs = await loadLocaleMessages(norm);
    i18n.global.setLocaleMessage(norm, msgs);
  }
  i18n.global.locale.value = norm;
}