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'use strict';

var inherits = require('inherits')
  , EventEmitter = require('events').EventEmitter
  ;

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

function Polling(Receiver, receiveUrl, AjaxObject) {
  debug(receiveUrl);
  EventEmitter.call(this);
  this.Receiver = Receiver;
  this.receiveUrl = receiveUrl;
  this.AjaxObject = AjaxObject;
  this._scheduleReceiver();
}

inherits(Polling, EventEmitter);

Polling.prototype._scheduleReceiver = function() {
  debug('_scheduleReceiver');
  var self = this;
  var poll = this.poll = new this.Receiver(this.receiveUrl, this.AjaxObject);

  poll.on('message', function(msg) {
    debug('message', msg);
    self.emit('message', msg);
  });

  poll.once('close', function(code, reason) {
    debug('close', code, reason, self.pollIsClosing);
    self.poll = poll = null;

    if (!self.pollIsClosing) {
      if (reason === 'network') {
        self._scheduleReceiver();
      } else {
        self.emit('close', code || 1006, reason);
        self.removeAllListeners();
      }
    }
  });
};

Polling.prototype.abort = function() {
  debug('abort');
  this.removeAllListeners();
  this.pollIsClosing = true;
  if (this.poll) {
    this.poll.abort();
  }
};

module.exports = Polling;