import i18next from 'i18next';
import Backend from 'i18next-chained-backend';
import LocalforageBackend from 'i18next-localforage-backend'; // primary use cache
import XHR from 'i18next-xhr-backend'; // fallback xhr load

i18next
  .use(Backend)
  .init({
    backend: {
      backends: [
        LocalforageBackend,  // primary
        XHR                   // fallback
      ],
      backendOptions: [{
        /* below options */
      }, {
        loadPath: '/locales/{{lng}}/{{ns}}.json' // xhr load path for my own fallback
      }]
    }
  });

var options = {
  // expiration
  expirationTime: 7*24*60*60*1000,

  // language versions
  versions: {},

  /**
  * Localforage specific options
  */
  
  // database name (prefix is using localStorage as storage driver)
  name: 'i18next_res',

  // The driver(s) to use, if multiple are provided, the first available is used
  driver: [localforage.INDEXEDDB, localforage.WEBSQL, localforage.LOCALSTORAGE],
  
  // when using IndexedDb is the dataStore name, when using WebSQL is the table name
  storeName: 'keyvaluepair',
  
  // DB schema version, used only in IndexedDB and WebSQL
  version: 1.0,

  // WebSQL only, database size in bytes
  size: 4980736,

  // description of the database, for developer usage
  description: '',
};