'use strict';

var resourcesToBackend = function resourcesToBackend(res) {
  return {
    type: 'backend',
    init: function init(services, backendOptions, i18nextOptions) {},
    read: function read(language, namespace, callback) {
      if (typeof res === 'function') {
        if (res.length < 3) {
          try {
            var r = res(language, namespace);
            if (r && typeof r.then === 'function') {
              r.then(function (data) {
                return callback(null, data && data.default || data);
              }).catch(callback);
            } else {
              callback(null, r);
            }
          } catch (err) {
            callback(err);
          }
          return;
        }
        res(language, namespace, callback);
        return;
      }
      callback(null, res && res[language] && res[language][namespace]);
    }
  };
};

module.exports = resourcesToBackend;