import { localeSetting } from '@eciol/shared';
import { useLocaleStore } from '@eciol/store';
import type { App } from 'vue';
import type { I18n, I18nOptions } from 'vue-i18n';
import { createI18n } from 'vue-i18n';

import { setHtmlPageLang, setLoadLocalePool } from './helper';
import { langen, langzh_CN } from './lang';

const { fallback, availableLocales } = localeSetting;

export let i18n: I18n;

async function createI18nOptions(): Promise<I18nOptions> {
  const localeStore = useLocaleStore();
  const locale = localeStore.getLocale;
  const defaultLocal = (await import(`../src/lang/${locale}.ts`)) as any;
  const message = defaultLocal.default?.message ?? {};
  const langs = {
    zh_CN: langzh_CN,
    en: langen,
  };
  Object.assign(message, langs[locale]);

  setHtmlPageLang(locale);
  setLoadLocalePool((loadLocalePool) => {
    loadLocalePool.push(locale);
  });

  return {
    legacy: false,
    locale,
    fallbackLocale: fallback,
    messages: {
      [locale]: message,
    },
    availableLocales,
    sync: true, //If you don’t want to inherit locale from global scope, you need to set sync of i18n component option to false.
    silentTranslationWarn: true, // true - warning off
    missingWarn: false,
    silentFallbackWarn: true,
  };
}

// setup i18n instance with glob
export async function setupI18n(app: App) {
  const options = await createI18nOptions();
  i18n = createI18n(options) as I18n;
  app.use(i18n as any);
}