/**
 * JavaScript AJAX Connector
 *
 * The main idea of ajax security - to send via HTTP instance_id of block and
 * php session identifier. in session array we save ClassName and it's location
 * so we can create calling class on server side by it's instance_id
 * srtipt where information is sending located in /core/ajax.php
 * 
 * TODO sending get variables
 *      sending post variables
 *      if post variables are undefined send info as GET request and POST elsewere
 *
 */
function cAJAXConnector(){
/**
 * XMLHTTP object. It wil be created by fist time call of call method
 */
  this.transport = null; 

/**
 * Sends request to the ajax script and returns it's response
 * always sending SID and instanse ID to point for the destination
 * class location
 */	
  this.call = function (instance_id,get_vars,post_vars){
	if (this.transport==null) this.createTransport();
	var get_vars_str = '';
	if (typeof(get_vars)!='undefined'){
	  for(index in get_vars){
	    get_vars_str = get_vars_str + '&' + index + '=' + encodeURIComponent(get_vars[index]);
	  }
	}
//	var xmlrpc_url = 'http://'+window.location.host+'/core/ajax.php?SID='+this.getSessionID()+'&i_id='+instance_id+get_vars_str;
	var xmlrpc_url = 'http://'+window.location.host+'/core/ajax.php?i_id='+instance_id+get_vars_str;

	this.transport.open('POST',xmlrpc_url,false);
    this.transport.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
    this.transport.send('');
	return this.transport.responseText;
  }
	
/**
 * Creates XMLHTTP object
 */
  this.createTransport = function(){
	var e;
	try {
	  this.transport = new ActiveXObject('MSXML2.XMLHTTP');
	}
	catch(e){}
	try {
	  this.transport = new ActiveXObject('Microsoft.XMLHTTP');
	}
	catch(e){}
	try {
	  this.transport = new XMLHttpRequest();
	}
	catch(e){}
	
	
  }
/**
 *  Takes session ID (PHPSESSID) from cookies 
 */
  this.getSessionID = function(){
	str = new String(document.cookie);
	//alert(str);
	f_index = str.indexOf('PHPSESSID')+10;
	l_index = str.indexOf(';',f_index);
	ses_id = str.slice(f_index,l_index);
	return ses_id;
  }	
}
var AJAXConnector = new cAJAXConnector();