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/*
 * Copyright (C)  2022 Kristóf Marussy <kristof@marussy.com>
 *
 * This file is part of Sophie.
 *
 * Sophie is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 * SPDX-License-Identifier: AGPL-3.0-only
 */

import { FALLBACK_LOCALE } from '@sophie/shared';
import i18next from 'i18next';
import { autorun } from 'mobx';
import { addDisposer } from 'mobx-state-tree';

import type MainStore from '../stores/MainStore';
import { getLogger } from '../utils/log';

import I18nStore from './I18nStore';
import LocatlizationRepository from './LocalizationRepository';
import RepositoryBasedI18nBackend from './RepositoryBasedI18nBackend';
import i18nLog from './i18nLog';

const log = getLogger('loadLocationzation');

export default async function loadLocalization(
  store: MainStore,
  repository: LocatlizationRepository,
  devMode: boolean,
): Promise<void> {
  const backend = new RepositoryBasedI18nBackend(repository, devMode);
  const i18n = i18next
    .createInstance({
      lng: store.shared.language,
      fallbackLng: [FALLBACK_LOCALE],
      debug: devMode,
      saveMissing: devMode,
    })
    .use(backend)
    .use(i18nLog);
  const i18nStore = new I18nStore(i18n);
  store.setI18n(i18nStore);
  await i18n.init();
  const disposeChangeLanguage = autorun(() => {
    const {
      shared: { language },
    } = store;
    if (i18n.language !== language) {
      log.debug('Setting language', language);
      i18n.changeLanguage(language).catch((error) => {
        log.error('Failed to change language', error);
      });
    }
  });
  addDisposer(store, disposeChangeLanguage);
}