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'use strict';

var inherits = require('inherits')
  , AjaxBasedTransport = require('./lib/ajax-based')
  , XhrReceiver = require('./receiver/xhr')
  , XHRCorsObject = require('./sender/xhr-cors')
  , XHRLocalObject = require('./sender/xhr-local')
  , browser = require('../utils/browser')
  ;

function XhrStreamingTransport(transUrl) {
  if (!XHRLocalObject.enabled && !XHRCorsObject.enabled) {
    throw new Error('Transport created when disabled');
  }
  AjaxBasedTransport.call(this, transUrl, '/xhr_streaming', XhrReceiver, XHRCorsObject);
}

inherits(XhrStreamingTransport, AjaxBasedTransport);

XhrStreamingTransport.enabled = function(info) {
  if (info.nullOrigin) {
    return false;
  }
  // Opera doesn't support xhr-streaming #60
  // But it might be able to #92
  if (browser.isOpera()) {
    return false;
  }

  return XHRCorsObject.enabled;
};

XhrStreamingTransport.transportName = 'xhr-streaming';
XhrStreamingTransport.roundTrips = 2; // preflight, ajax

// Safari gets confused when a streaming ajax request is started
// before onload. This causes the load indicator to spin indefinetely.
// Only require body when used in a browser
XhrStreamingTransport.needBody = !!global.document;

module.exports = XhrStreamingTransport;