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'use strict';

var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
  debug = require('debug')('sockjs-client:utils:transport');
}

module.exports = function(availableTransports) {
  return {
    filterToEnabled: function(transportsWhitelist, info) {
      var transports = {
        main: []
      , facade: []
      };
      if (!transportsWhitelist) {
        transportsWhitelist = [];
      } else if (typeof transportsWhitelist === 'string') {
        transportsWhitelist = [transportsWhitelist];
      }

      availableTransports.forEach(function(trans) {
        if (!trans) {
          return;
        }

        if (trans.transportName === 'websocket' && info.websocket === false) {
          debug('disabled from server', 'websocket');
          return;
        }

        if (transportsWhitelist.length &&
            transportsWhitelist.indexOf(trans.transportName) === -1) {
          debug('not in whitelist', trans.transportName);
          return;
        }

        if (trans.enabled(info)) {
          debug('enabled', trans.transportName);
          transports.main.push(trans);
          if (trans.facadeTransport) {
            transports.facade.push(trans.facadeTransport);
          }
        } else {
          debug('disabled', trans.transportName);
        }
      });
      return transports;
    }
  };
};