/* 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 */
/* Modified by Tomas Vosatka, Clapix s.r.o. */

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.loading = false;
  		this.loadingElement = 'ajaxStatusWindow';
  		this.element = null;
		this.elementObj = null;
		this.requestFile = file;
		this.childID = null;
		this.vars = new Object();
		this.responseStatus = new Array(2);
  	};

	this.resetFunctions = function() {
  		this.onLoading = function() { };
  		this.onLoaded = function() { };
  		this.onInteractive = function() { };
  		this.onComplete = function() { };
  		this.onCompletion = function() { };
  		this.onError = function() { };
		this.onFail = function() { };
	};

	this.reset = function() {
		this.resetFunctions();
		this.resetData();
	};
	
	this.setLoading = function() {
        if (document.getElementById(this.loadingElement) == null)
        {
    	    var x = document.createElement('div');
    	    x.setAttribute('id',this.loadingElement);
    	    x.className = 'hideLoading';
    		document.body.appendChild(x);
		}
	    
        var e = document.getElementById(this.loadingElement);
	    
        this.onLoading = function() 
        {
            if (e)
            {
                var posX = Math.round(document.body.scrollLeft + (document.body.clientWidth / 2 - 10));
                var posY = Math.round(document.body.scrollTop + (document.body.clientHeight / 2 - 10));
				e.style.left = posX.toString()+'px';
                e.style.top = posY.toString()+'px';
                e.className = 'showLoading';
            } 
        }

        this.onLoaded = function()
        {
            this.onLoading();
        }
        
        this.onComplete = function()
        {
	    	if (e)
	        {
                e.className = 'hideLoading';
            }
        }   
    }

	this.createAJAX = function() {
		try {
			this.xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e1) {
			try {
				this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e2) {
				this.xmlhttp = null;
			}
		}

		if (! this.xmlhttp) {
			if (typeof XMLHttpRequest != "undefined") {
				this.xmlhttp = new XMLHttpRequest();
			} else {
				this.failed = true;
			}
		}
	};

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

	this.encVar = function(name, value, returnvars) {
		if (true == returnvars) {
			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;
			}
		}

		// prevents caching of URLString
		this.setVar("rndval", new Date().getTime());

		urlstringtemp = new Array();
		for (key in this.vars) {
			if (false == this.vars[key][1] && true == this.encodeURIString) {
				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) {
			    if (this.loading)
			    {
                    this.setLoading();
                }
			
				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");
				        this.xmlhttp.setRequestHeader("Content-length", this.URLString.length);
					} 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();
								// TODO AJAX LIGHTBOX VYCHYTAVKA POZOR NA TO	
	                            self.onComplete();
	                            if (self.responseStatus[0] == "200") 
	                            {
	                                self.onCompletion(self,self.childID);
	                            } else {
	                                self.onError();
	                            }
	
	                            self.URLString = "";													
								return;
							}

							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;
								}
							}
                            self.onComplete();
							if (self.responseStatus[0] == "200") 
                            {
								self.onCompletion(self,self.childID);
							} else {
								self.onError();
							}

							self.URLString = "";
							break;
					}
				};
				if (this.method == "GET")
				{
					this.URLString = null;
				}
				this.xmlhttp.send(this.URLString);
			}
		}
	};

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

/**
 *  Funkce zavola ajaxovy pozadavek a podle parametru provede vysledek.
 *  Je vhodne funkci volat jako onclick="return ajaxRequest(...);" - funkce vraci false a zamezi tak
 *  zastaveni nacitani zbytku stranky v IE.
 *
 *  Parametry
 *  ========= 
 *      url:                (string) URL na kterou se odesle pozadavek
 *      method:             (string) POST nebo GET, defaultne POST
 *      params:             (array) dalsi doplnujici parametry (napr. pro GET ve tvaru {param1:'hodnota1',param2:'hodnota2'}), bez parametru uvedte hodnotu {}   
 *      loading:            (boolean) true / false zda se  ma zobrazovat ikonka informujici o prubehu pozadavku 
 *      evaling:            (boolean) true / false zda se ma vysledek pozadavku rovnou provest pomoci metody eval()
 *      returnFunc:         (string) jmeno funkce, ktere se preda instance na ajaxRequest jako prvni parametr - pote lze s vysledkem 
 *                                   provadet cokoliv, evalovat, parsovatXML atd. - dosupne ve vlastnostech instance.response, 
 *                                   instance.responseXML, instance.responseStatus atd.
 *                                   pokud neni potreba, uvedte jako hodnotu parametru '' nebo null 
 *      returnFuncParam:    (mixed) druhy parametr, ktery bude predat funkci returnFunc (napr. ID elementu, cislo pro porovnani apod.)
 *      returnElement:      (string) id elementu do ktereho se primo vrati vysledek pozadavku - jako value pro SELECT, INPUT, OPTION, 
 *                                   TEXTAREA nebo jako innerHTML pro ostatni elementy
 *                                   pokud neni potreba, uvedte jako hodnotu parametru '' nebo null 
 */
function ajaxRequest(url, method, params, loading, evaling, returnFunc, returnFuncParam, returnElement, opener, winOpener)
{
	var ajax = new sack();
	
	switch(method)
	{
		case 'POST' : 
		case 'GET':
			break;
		default : method = 'POST';
	}

	ajax.reset();
	
	if (params)
	{
		for (key in params)
		{
			ajax.setVar(key, params[key]); 
		}
	}
	
	if (loading == true)
    {	
		ajax.loading = true;
	} 

	ajax.requestFile = url;
	ajax.method = method;
	
	if (evaling == true)
	{
        ajax.execute = true;
    }
    
    if (returnElement != '' && returnElement != null)
    {
        ajax.element = returnElement;
    }
    
    if (returnFunc != '' && returnFunc != null)
    {
	   ajax.childID = returnFuncParam;
	   if (eval("window."+returnFunc)) ajax.onCompletion = eval(returnFunc);
	}
	
	ajax.runAJAX();
	
	return false;
}