var XHRPolling = require('./xhr-polling')
  , util = require(process.binding('natives').util ? 'util' : 'sys');

JSONPPolling = module.exports = function(){
  XHRPolling.apply(this, arguments);
};

util.inherits(JSONPPolling, XHRPolling);
  
JSONPPolling.prototype.getOptions = function(){
  return {
    timeout: null, // no heartbeats
    closeTimeout: 8000,
    duration: 20000
  };
};
  
JSONPPolling.prototype._onConnect = function(req, res){
  this._index = req.url.match(/\/([0-9]+)\/?$/).pop();
  XHRPolling.prototype._onConnect.call(this, req, res);
};
  
JSONPPolling.prototype._write = function(message){
  if (this._open){
    if (this.request.headers.origin && !this._verifyOrigin(this.request.headers.origin)){
      message = "alert('Cross domain security restrictions not met');";
    } else {
      message = "io.JSONP["+ this._index +"]._("+ JSON.stringify(message) +");";
    }
    this.response.writeHead(200, {'Content-Type': 'text/javascript; charset=UTF-8', 'Content-Length': Buffer.byteLength(message)});
    this.response.write(message);
    this.response.end();
    this._onClose();
  }
};