schon/storefront/composables/languages/useLanguage.ts

import {GET_LANGUAGES} from "~/graphql/queries/standalone/languages.js";
import type {ILanguage} from "~/types";
import type {ILanguagesResponse} from "~/types";
import {useAppConfig} from "~/composables/config";
import {DEFAULT_LOCALE, SUPPORTED_LOCALES} from "~/config/constants";

export async function useLanguages() {
  const languageStore = useLanguageStore();

  const { COOKIES_LOCALE_KEY } = useAppConfig();

  const cookieLocale = useCookie(
      COOKIES_LOCALE_KEY,
      {
        default: () => DEFAULT_LOCALE,
        path: '/'
      }
  );

  const { data, error } = await useAsyncQuery<ILanguagesResponse>(
    GET_LANGUAGES
  );

  if (!error.value && data.value?.languages) {
    const filteredLanguages = data.value.languages.filter((locale: ILanguage) =>
      SUPPORTED_LOCALES.some(supportedLocale =>
        supportedLocale.code === locale.code
      )
    );

    languageStore.setLanguages(filteredLanguages);

    const currentLocale = filteredLanguages.find(locale =>
      locale.code === cookieLocale.value
    );

    if (currentLocale) {
      languageStore.setCurrentLocale(currentLocale);
    }
  }

  watch(error, (err) => {
    if (err) {
      console.error('useLanguage error:', err)
    }
  });

  return {

  };
}