/**
 * Biblioteka do obslugi requestow HTTP od JS
 *
 * @author Mariusz Chwalba <koder at mediasystems dot pl>
 * @copyright 2008 Media Systems
 * @package lib
 * @subpackage js
 */


function HTTPRequest( url )
{
	this.oninit       = null;
	this.onconnecting = null;
	this.onheaders    = null;
	this.onloading    = null;
	this.onload       = null;
	this.data         = null;

	this.url = url;
	this.method = 'POST';
	this.async = true;
	
	this.data = {};
	
	if (window.XMLHttpRequest)
	{
		this.request = new XMLHttpRequest();
	}
	else if(window.ActiveXObject)
	{
		this.request = new ActiveXObject("Microsoft.XMLHTTP");
	}
	else
	{
		alert( 'AJAX not supported' );
	}
	
	this.onreadystatechange = function( wrapper )
	{
		var state   = wrapper.request.readyState;
		
		switch( state )
		{
			case 0:
				if ( wrapper.oninit ) return wrapper.oninit();
				break;
			case 1:
				if ( wrapper.onconnecting ) return wrapper.onconnecting();
				break;
			case 2:
				if ( wrapper.onheaders ) return wrapper.onheaders();
				break;
				
			case 3:
				if ( wrapper.onloading ) return wrapper.onloading();
				break;
				
			case 4:
				if ( wrapper.onload ) return wrapper.onload();
				break;
				
		}
	}
	
	this.getEncodedData = function()
	{
		if ( this.data == null ) return null;
		
		var out='';
		for( key in this.data )
		{
			out += ( escape( key ) + '=' + ( this.data[key].toString().replace(/&/,'%26') ) + '&' );
		}
		
		return out;
	}
	
	this.send = function()
	{
		this.request.open( this.method, this.url, this.async );
		var iam = this;
		this.request.onreadystatechange = function() { iam.onreadystatechange( iam ); };
		
		if ( this.method=='POST' )
		{
			this.request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
		}
		
		this.request.send( this.getEncodedData() );
		
	}
	
	this.response = function()
	{
		var text = this.request.responseText;
		if ( text == '' ) return '';
		var obj = eval( '(' + text + ')' );
		return obj;
	}
}