/**
 * Copyright 2017 Red Hat Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License. You may obtain
 * a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */

import { getEnabledLanguages } from '../selectors/i18n';
import { MESSAGES } from '../components/i18n/messages';

export default {
  detectLanguage() {
    return (dispatch, getState) => {
      const languages = getEnabledLanguages(getState());
      let language;
      // If the configuration contains only one language and there
      // are messages for it, return it;
      if (languages && languages.length === 1 && MESSAGES[languages[0]]) {
        language = languages[0];
      } else {
        const locale =
          localStorage.getItem('language') ||
          (navigator.languages && navigator.languages[0]) ||
          navigator.language ||
          navigator.userLanguage;
        // If the locale contains the country but we can't find
        // messages for it then we only use the country part:
        language =
          locale.match(/^[A-Za-z]+-[A-Za-z]+$/) && !MESSAGES[locale]
            ? locale.split('-')[0]
            : locale;
      }
      dispatch(this.chooseLanguage(language));
    };
  },

  chooseLanguage(language) {
    localStorage.setItem('language', language);
    return {
      type: 'CHOOSE_LANGUAGE',
      payload: language
    };
  }
};
