import Logger from 'core/logger';
import TimelineSender from 'core/timeline/timeline_sender'
import * as Collections from 'core/utils/collections';
import Util from 'core/util';
import Runtime from 'runtime';
import TimelineTransport from 'core/timeline/timeline_transport';

var getAgent = function(sender : TimelineSender, useTLS : boolean) {
  return function(data : any, callback : Function) {
    var scheme = "http" + (useTLS ? "s" : "") + "://";
    var url = scheme + (sender.host || sender.options.host) + sender.options.path;
    var query = Collections.buildQueryString(data);
    url += ("/" + 2 + "?" + query);

    fetch(url).
      then((response) => {
        if (response.status !== 200) {
          throw(`received ${response.status} from stats.pusher.com`)
        }
        return response.json();
      }).then(({host})=>{
        if (host) {
          sender.host = host;
        }
      }).catch((err)=> {
        Logger.debug("TimelineSender Error: ", err);
      });
  }
}

var fetchTimeline = {
  name: 'xhr',
  getAgent
}

export default fetchTimeline;