/* Simple AJAX Code-Kit (SACK) v1.6.1 */
/* ©2005 Gregory Wild-Smith */
/* www.twilightuniverse.com */
/* Software licenced under a modified X11 licence, see documentation or authors website for more details */

function sack(file)
{
    this.xmlhttp = null;
	
	this.resetData = function()
	{
		this.method = "POST";
  		this.queryStringSeparator = "?";
		this.argumentSeparator = "&";
		this.URLString = "";
		this.encodeURIString = true;
  		this.execute = false;
  		this.element = null;
		this.elementObj = null;
		this.requestFile = file;
		this.vars = new Object();
		this.responseStatus = new Array(2);
		this.unid = null;
  	}
  	
  	this.resetFunctions = function()
  	{
		this.onLoading = function() {};
  		this.onLoaded = function() {};
  		this.onInteractive = function() {};
  		this.onCompletion = function() {};
  		this.onError = function() {};
		this.onFail = function() {};
	}
	
	this.reset = function()
	{
		this.resetFunctions();
		this.resetData();
	}

	this.createAJAX = function()
	{
		try
		{
		    this.xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
		    //alert("Msxml2.XMLHTTP");
		}
		catch (e1)
		{
		    try
		    {
		        this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
		        //alert("Microsoft.XMLHTTP");
			}
			catch (e2)
			{
			    this.xmlhttp = null;
			}
		}
		
		if (!this.xmlhttp)
		{
		    if (typeof XMLHttpRequest != "undefined")
		    {
		        this.xmlhttp = new XMLHttpRequest();
		        //alert("XMLHttpRequest");
			}
			else
			{
				this.failed = true;
			}
		}
	}

	this.setVar = function(name, value)
	{
	    this.vars[name] = Array(value, false);
	}

    this.encVar = function(name, value, returnvars)
    {
        if (returnvars == true)
        {
            return Array(encodeURIComponent(name), encodeURIComponent(value));
		}
		else
		{
			this.vars[encodeURIComponent(name)] = Array(encodeURIComponent(value), true);
		}
	}
	
	this.processURLString = function(string, encode)
	{
	    encoded = encodeURIComponent(this.argumentSeparator);
		regexp = new RegExp(this.argumentSeparator + "|" + encoded);
		varArray = string.split(regexp);
		for (i = 0; i < varArray.length; i++)
		{
			urlVars = varArray[i].split("=");
			if (true == encode)
			{
				this.encVar(urlVars[0], urlVars[1]);
			}
			else
			{
				this.setVar(urlVars[0], urlVars[1]);
			}
		}
	}

	this.createURLString = function(urlstring)
	{
	    if (this.encodeURIString && this.URLString.length)
	    {
			this.processURLString(this.URLString, true);
		}
		
		if (urlstring)
		{
			if (this.URLString.length)
			{
				this.URLString += this.argumentSeparator + urlstring;
			}
			else
			{
				this.URLString = urlstring;
			}
		}
		
		this.setVar("rndval", new Date().getTime());
		
		urlstringtemp = new Array();
		for (key in this.vars)
		{
			if (this.vars[key][1] == false && this.encodeURIString == true)
			{
				encoded = this.encVar(key, this.vars[key][0], true);
				delete this.vars[key];
				this.vars[encoded[0]] = Array(encoded[1], true);
				key = encoded[0];
			}

			urlstringtemp[urlstringtemp.length] = key + "=" + this.vars[key][0];
		}
		if (urlstring)
		{
			this.URLString += this.argumentSeparator + urlstringtemp.join(this.argumentSeparator);
		}
		else
		{
			this.URLString += urlstringtemp.join(this.argumentSeparator);
		}
	}

	this.runResponse = function()
	{
		eval(this.response);
	}
	
	this.runAJAX = function(urlstring)
	{
	    if (this.failed)
	    {
		    this.onFail();
		}
		else
		{
		    this.createURLString(urlstring);
			if (this.element)
			{
				this.elementObj = document.getElementById(this.element);
			}
			if (this.xmlhttp)
			{
				var self = this;
				if (this.method == "GET")
				{
					totalurlstring = this.requestFile + this.queryStringSeparator + this.URLString;
					this.xmlhttp.open(this.method, totalurlstring, true);
				}
				else
				{
					this.xmlhttp.open(this.method, this.requestFile, true);
					try
					{
						this.xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded")
					}
					catch (e) {}
				}
				
				this.xmlhttp.onreadystatechange = function()
				{
					switch (self.xmlhttp.readyState)
					{
						case 1:
							self.onLoading();
							break;
						case 2:
							self.onLoaded();
							break;
						case 3:
							self.onInteractive();
							break;
						case 4:
							self.response = self.xmlhttp.responseText;
							self.responseXML = self.xmlhttp.responseXML;
							self.responseStatus[0] = self.xmlhttp.status;
							self.responseStatus[1] = self.xmlhttp.statusText;

							if (self.execute)
							{
								self.runResponse();
							}

							if (self.elementObj)
							{
								elemNodeName = self.elementObj.nodeName;
								elemNodeName.toLowerCase();
								if (elemNodeName == "input" || elemNodeName == "select" || elemNodeName == "option" || elemNodeName == "textarea")
								{
								    self.elementObj.value = self.response;
								}
								else
								{
									self.elementObj.innerHTML = self.response;
								}
							}
							if (self.responseStatus[0] == "200")
							{
								self.onCompletion();
							}
							else
							{
								self.onError();
							}

							self.URLString = "";
							break;
					}
				}

				this.xmlhttp.send(this.URLString);
			}
		}
	}

	this.reset();
	this.createAJAX();
}

///////////////////////////////////////////////////////////////////////////////////////////////////////////

var ajax = new sack();
var ajaxTasks = Array();
var isAjaxReady = true;
var debugMode = false;
var alertTimerId = 0;

function GetAjax(type, value, obj, selected, language, unid)
{
    if(typeof unid == "undefined") unid = ajaxTasks.length;
    
    if(isAjaxReady)
    {
	    if(!type) type = '';
	    if(!value) value = '';
	    if(!obj) obj = '';
	    if(!selected) selected = '';
	    if(!language) language = 'lt';

	    if(type.length > 0 && obj.length > 0)
	    {
	        isAjaxReady = false;
		    ajax.unid = unid;
		    
		    if(document.getElementById(obj + '_loading'))
		    {
		        document.getElementById(obj + '_loading').style.visibility = 'visible';
		        document.getElementById(obj + '_loading').style.display = 'inline';
		    }
		    ajax.requestFile = urlserver + 'ajax.php?r=' + RandomString(8) + '&t=' + type + '&v=' + value + '&o=' + obj + '&l=' + language + '&s=' + selected;
		    ajax.onCompletion = LoadAjax;
		    ajax.runAJAX();
	    }
	}
	
	ajaxTasks[unid] = "GetAjax('" + type + "', '" + value + "', '" + obj + "', '" + selected + "', '" + language + "', " + unid + ");";
}

function LoadAjax()
{
	eval(ajax.response);
	isAjaxReady = true;
	if(debugMode) alert('Removing task #' + ajax.unid + ': ' + ajaxTasks[ajax.unid]);
	clearTimeout(alertTimerId); // clear timer
	ajaxTasks[ajax.unid] = "";
    RunAjaxTasks();
}

function SetAjaxTaskEval(task)
{
    var unid = ajaxTasks.length;
    ajaxTasks[unid] = task.replace("@unid", unid);
	if(debugMode) alert('Saved task #' + unid + ': ' + ajaxTasks[unid]);
}

function RunAjaxTasks()
{
    for(x = 0; x < ajaxTasks.length; x++)
    {
        if(ajaxTasks[x] != "")
	    {
	        if(isAjaxReady)
	        {
        	    if(debugMode) alert('Starting task #' + x + ': ' + ajaxTasks[x]);
        	    alertTimerId = setTimeout(ajaxTasks[x], 100); // set timer to 0.1 second
        	    //eval(ajaxTasks[x]);
	        }
	        x = ajaxTasks.length;
	    }
	}
}

function ShowAjaxTasks()
{
    var s = "";
    for(x = 0; x < ajaxTasks.length; x++) s += "#" + x + ": " + ajaxTasks[x] + "\n";
    alert(s);
}