/*
* AdvancedAJAX 1.1
* (c) 2005-2006 Lukasz Lach
* mail: anakin@php5.pl
* www:  http://advajax.anakin.us/
*       http://anakin.us/
* http://creativecommons.org/licenses/LGPL/2.1/
*
* This is beta release of AdvancedAJAX 1.1 object. Changelog:
* - onProgress (Mozilla and Opera only) and onReadyStateChange events
* - advAJAX.download static method downloading URL contents directly
*   into element specified as object or id
* - advAJAX.scan static method searching for hyperlinks with
*   rel="advancedajax" and downloading URL contents from href attribute into
*   newly created div element, class value can be specified
* - fixed bug: form element named "action" crashed advAJAX.submit()
* - fixed bug: when dealing when select-multiple element advAJAX sent only
*              one (last) selected value
* - fixed bug: onInitialization triggered after handling parameters, so they
*              were unaccessable to modify or create
* - fixed bug: onFinalization not triggered after onFatalError
*
* To jest wersja beta obiektu AdvancedAJAX 1.1. Changelog:
* - dodano onProgress (tylko Mozilla i Opera) oraz onReadyStateChange
* - metoda statyczna advAJAX.download, pobierajaca zawartosc adresu URL do
*   elementu wskazanego w parametrze bezposrednio lub poprzez id
* - metoda statyczna advAJAX.scan szukajaca hiperlaczy z atrybutem
*   rel="advancedajax" i pobierajaca zawartosc adresu URL wskazanego przez
*   atrybut href do nowo stworzonego elementu div, mozna przekazac wartosc class
* - naprawiony blad: element formularza o nazwie "action" wywalal advAJAX.submit()
* - naprawiony blad: w przypadku pol formularza o tej samej nazwie (select-multiple)
*   wysylana byla tylko jedna (ostatnia) wartosc
* - naprawiony blad: onInitialization byl wywolywany po przefiltrowaniu listy parametrow,
*   przez co niemozliwa byla ich modyfikacja
* - naprawiony blad: onFinalization nie bylo wywolywane po onFatalError
*/

function advAJAX()
{
	var obj = new Object();

	obj.url = window.location.href;
	obj.method = "GET";
	obj.parameters = new Object();
	obj.headers = new Object();
	obj.async = true;
	obj.mimeType = "text/xml";
	obj.username = null;
	obj.password = null;
	obj.form = null;
	obj.disableForm = true;

	obj.unique = true;
	obj.uniqueParameter = "_uniqid";

	obj.requestDone = false;
	obj.queryString = "";
	obj.responseText = null;
	obj.responseXML = null;
	obj.status = null;
	obj.statusText = null;
	obj.aborted = false;
	obj.timeout = 0;
	obj.retryCount = 0;
	obj.retryDelay = 1000;
	obj.tag = null;
	obj.group = null;
	obj.progressTimerInterval = 50;

	obj.xmlHttpRequest = null;

	obj.onInitialization = null;
	obj.onFinalization = null;
	obj.onReadyStateChange = null;
	obj.onLoading = null;
	obj.onLoaded = null;
	obj.onInteractive = null;
	obj.onComplete = null;
	obj.onProgress = null;
	obj.onSuccess = null;
	obj.onFatalError = null;
	obj.onError = null;
	obj.onTimeout = null;
	obj.onRetryDelay = null;
	obj.onRetry = null;
	obj.onGroupEnter = null;
	obj.onGroupLeave = null;

	obj.createXmlHttpRequest = function()
	{
		if (typeof XMLHttpRequest != "undefined")
			return new XMLHttpRequest();

		var xhrVersion = [ "MSXML2.XMLHttp.5.0", "MSXML2.XMLHttp.4.0","MSXML2.XMLHttp.3.0",
			"MSXML2.XMLHttp","Microsoft.XMLHttp" ];

		for (var i = 0; i < xhrVersion.length; i++)
		{
			try
			{
				var xhrObj = new ActiveXObject(xhrVersion[i]);
				return xhrObj;
			}
			catch (e) { }
		}
		obj.raiseEvent("FatalError");
		return null;
	};

	obj._oldResponseLength = null;
	obj._progressTimer = null;
	obj._progressStarted = navigator.userAgent.indexOf('Opera') == -1;
	obj._onProgress = function()
	{
		if (typeof obj.onProgress == "function" && typeof obj.xmlHttpRequest.getResponseHeader == "function")
		{
			var contentLength = obj.xmlHttpRequest.getResponseHeader("Content-length");
			if (contentLength != null && contentLength != '')
			{
				var responseLength = obj.xmlHttpRequest.responseText.length;
				if (responseLength != obj._oldResponseLength)
				{
					obj.raiseEvent("Progress", obj, responseLength, contentLength);
					obj._oldResponseLength = obj.xmlHttpRequest.responseText.length;
				}
			}
		}
		if (obj._progressStarted) return;
		obj._progressStarted = true;
		var _obj = this;
		this.__onProgress = function()
		{
			obj._onProgress();
			obj._progressTimer = window.setTimeout(_obj.__onProgress, obj.progressTimerInterval);
		}
		_obj.__onProgress();
	}

	obj._onInitializationHandled = false;
	obj._initObject = function()
	{
		if (obj.xmlHttpRequest != null)
		{
			delete obj.xmlHttpRequest["onreadystatechange"];
			obj.xmlHttpRequest = null;
		}

		if ((obj.xmlHttpRequest = obj.createXmlHttpRequest()) == null)
			return null;
		if (typeof obj.xmlHttpRequest.overrideMimeType != "undefined")
				obj.xmlHttpRequest.overrideMimeType(obj.mimeType);
		obj.xmlHttpRequest.onreadystatechange = function()
		{
			if (obj == null || obj.xmlHttpRequest == null)
				return;
			obj.raiseEvent("ReadyStateChange", obj, obj.xmlHttpRequest.readyState);
			obj._onProgress();
			switch (obj.xmlHttpRequest.readyState)
			{
				case 1: obj._onLoading(); break;
				case 2: obj._onLoaded(); break;
				case 3: obj._onInteractive(); break;
				case 4: obj._onComplete(); break;
			}
		};
		obj._onLoadingHandled =
		obj._onLoadedHandled =
		obj._onInteractiveHandled =
		obj._onCompleteHandled = false;
	};

	obj._onLoading = function()
	{
		if (obj._onLoadingHandled)
			return;
		if (!obj._retry && obj.group != null)
		{
			if (typeof advAJAX._groupData[obj.group] == "undefined")
				advAJAX._groupData[obj.group] = 0;
			advAJAX._groupData[obj.group]++;
			if (typeof obj.onGroupEnter == "function" && advAJAX._groupData[obj.group] == 1)
				obj.onGroupEnter(obj);
		}
		obj.raiseEvent("Loading", obj);
    obj._onLoadingHandled = true;
	};
	obj._onLoaded = function()
	{
		if (obj._onLoadedHandled)
			return;
		obj.raiseEvent("Loaded", obj);
		obj._onLoadedHandled = true;
	};
	obj._onInteractive = function()
	{
		if (obj._onInteractiveHandled)
			return;
		obj.raiseEvent("Interactive", obj);
		obj._onInteractiveHandled = true;
		if (!obj._progressStarted)
			obj._onProgress();
	};
	obj._onComplete = function()
	{
		if (obj._onCompleteHandled || obj.aborted)
			return;
		if (obj._progressStarted) {
			window.clearInterval(obj._progressTimer);
			obj._progressStarted = false;
		}
		obj.requestDone = true;
		with (obj.xmlHttpRequest)
		{
			obj.responseText = responseText;
			obj.responseXML = responseXML;
			if (typeof status != "undefined")
				obj.status = status;
			if (typeof statusText != "undefined")
				obj.statusText = statusText;
		}
		obj.raiseEvent("Complete", obj);
		obj._onCompleteHandled = true;
		if (obj.status == 200)
			obj.raiseEvent("Success", obj);
		else
			obj.raiseEvent("Error", obj);
		delete obj.xmlHttpRequest['onreadystatechange'];
		obj.xmlHttpRequest = null;
		if (obj.disableForm)
		obj.switchForm(true);
		obj._groupLeave();
		obj.raiseEvent("Finalization", obj);
	};

	obj._groupLeave = function()
	{
		if (obj.group != null) {
			advAJAX._groupData[obj.group]--;
		if (advAJAX._groupData[obj.group] == 0)
			obj.raiseEvent("GroupLeave", obj);
		}
	};

	obj._retry = false;
	obj._retryNo = 0;
	obj._onTimeout = function()
	{
		if (obj == null || obj.xmlHttpRequest == null || obj._onCompleteHandled)
			return;
		obj.aborted = true;
		obj.xmlHttpRequest.abort();
		obj.raiseEvent("Timeout", obj);
		obj._retry = true;
		if (obj._retryNo != obj.retryCount)
		{
			obj._initObject();
			if (obj.retryDelay > 0)
			{
				obj.raiseEvent("RetryDelay", obj);
				startTime = new Date().getTime();
				while (new Date().getTime() - startTime < obj.retryDelay);
			}
			obj._retryNo++;
			obj.raiseEvent("Retry", obj, obj._retryNo);
			obj.run();
		} else {
			delete obj.xmlHttpRequest["onreadystatechange"];
			obj.xmlHttpRequest = null;
			if (obj.disableForm)
				obj.switchForm(true);
			obj._groupLeave();
			obj.raiseEvent("Finalization", obj);
		}
	};

	obj.run = function()
	{
		obj._initObject();
		if (obj.xmlHttpRequest == null)
			return false;
		obj.aborted = false;
		if (!obj._onInitializationHandled)
		{
			obj.raiseEvent("Initialization", obj);
			obj._onInitializationHandled = true;
		}
		if (obj.method == "GET" && obj.unique)
			obj.parameters[encodeURIComponent(obj.uniqueParameter)] = new Date().getTime().toString().substr(5) + Math.floor(Math.random() * 100).toString();
		if (!obj._retry)
		{
			for (var a in obj.parameters)
			{
				if (obj.queryString.length > 0)
					obj.queryString += "&";
				if (typeof obj.parameters[a] != "object")
					obj.queryString += encodeURIComponent(a) + "=" + encodeURIComponent(obj.parameters[a]);
				else
				{
					for (var i = 0; i < obj.parameters[a].length; i++)
						obj.queryString += encodeURIComponent(a) + "=" + encodeURIComponent(obj.parameters[a][i]) + "&";
					obj.queryString = obj.queryString.slice(0, -1);
				}
			}
			if (obj.method == "GET" && obj.queryString.length > 0)
				obj.url += (obj.url.indexOf("?") != -1 ? "&" : "?") + obj.queryString;
		}
		if (obj.disableForm)
			obj.switchForm(false);
		try
		{
			obj.xmlHttpRequest.open(obj.method, obj.url, obj.async, obj.username || '', obj.password || '');
		} catch (e) {
			obj.raiseEvent("FatalError", obj, e);
			return;
		}
		if (obj.timeout > 0)
			setTimeout(obj._onTimeout, obj.timeout);
		if (typeof obj.xmlHttpRequest.setRequestHeader != "undefined")
			for (var a in obj.headers)
				obj.xmlHttpRequest.setRequestHeader(encodeURIComponent(a), encodeURIComponent(obj.headers[a]));
		if (obj.method == "POST" && typeof obj.xmlHttpRequest.setRequestHeader != "undefined")
		{
			obj.xmlHttpRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
			obj.xmlHttpRequest.send(obj.queryString);
		} else if (obj.method == "GET")
			obj.xmlHttpRequest.send('');
	};

	obj.handleArguments = function(args)
	{
		if (typeof args.form == "object" && args.form != null)
		{
			obj.form = args.form;
			obj.appendForm();
		}
		for (a in args)
		{
			if (typeof obj[a] == "undefined")
				obj.parameters[a] = args[a];
			else
			{
				if (a != "parameters" && a != "headers")
					obj[a] = args[a]; else
				for (b in args[a])
					obj[a][b] = args[a][b];
			}
		}
		obj.method = obj.method.toUpperCase();
	};

	obj.switchForm = function(enable)
	{
		if (typeof obj.form != "object" || obj.form == null)
			return;
		with (obj.form)
			for (var nr = 0; nr < elements.length; nr++)
				if (!enable)
				{
					if (elements[nr]["disabled"])
						elements[nr]["_disabled"] = true;
					else
						elements[nr]["disabled"] = "disabled";
				} else
					if (typeof elements[nr]["_disabled"] == "undefined")
						elements[nr].removeAttribute("disabled");
	};

	obj.appendForm = function()
	{
		with (obj.form)
		{
			obj.method = getAttribute("method").toUpperCase();
			obj.url = getAttribute("action");
			for (var nr = 0; nr < elements.length; nr++)
			{
				var e = elements[nr];
				if (e.disabled)
					continue;
				switch (e.type)
				{
					case "text":
					case "password":
					case "hidden":
					case "textarea":
						obj.addParameter(e.name, e.value);
						break;
					case "select-one":
						if (e.selectedIndex >= 0)
							obj.addParameter(e.name, e.options[e.selectedIndex].value);
						break;
					case "select-multiple":
						for (var nr2 = 0; nr2 < e.options.length; nr2++)
							if (e.options[nr2].selected)
								obj.addParameter(e.name, e.options[nr2].value);
						break;
					case "checkbox":
					case "radio":
						if (e.checked)
							obj.addParameter(e.name, e.value);
						break;
				}
			}
		}
	};

	obj.addParameter = function(name, value)
	{
		if (typeof obj.parameters[name] == "undefined")
			obj.parameters[name] = value;
		else
			if (typeof obj.parameters[name] != "object")
				obj.parameters[name] = [ obj.parameters[name], value ]; else
		obj.parameters[name][obj.parameters[name].length] = value;
	};
	obj.delParameter = function(name)
	{
		delete obj.parameters[name];
	};
	obj.raiseEvent = function(name)
	{
		var args = [];
		for (var i = 1; i < arguments.length; i++)
			args.push(arguments[i]);
		if (typeof obj["on" + name] == "function")
			obj["on" + name].apply(null, args);
		if (name == "FatalError")
			obj.raiseEvent("Finalization", obj);
	}

	if (typeof advAJAX._defaultParameters != "undefined")
		obj.handleArguments(advAJAX._defaultParameters);
	return obj;
}

advAJAX.get = function(args)
{
	return advAJAX.handleRequest("GET", args);
};

advAJAX.post = function(args)
{
	return advAJAX.handleRequest("POST", args);
};

advAJAX.head = function(args)
{
	return advAJAX.handleRequest("HEAD", args);
};

advAJAX.submit = function(form, args)
{
	if (typeof args == "undefined" || args == null)
		return -1;
	if (typeof form != "object" || form == null)
		return -2;
	var request = new advAJAX();
	args["form"] = form;
	request.handleArguments(args);
	return request.run();
};

advAJAX.assign = function(form, args)
{
	if (typeof args == "undefined" || args == null)
		return -1;
	if (typeof form != "object" || form == null)
		return -2;
	if (typeof form["onsubmit"] == "function")
		form["_onsubmit"] = form["onsubmit"];
	form["advajax_args"] = args;
	form["onsubmit"] = function()
	{
		if (typeof this["_onsubmit"] != "undefined" && this["_onsubmit"]() === false)
			return false;
		if (advAJAX.submit(this, this["advajax_args"]) == false)
			return true;
		return false;
	}
	return true;
};

advAJAX.download = function(targetObj, url)
{
	if (typeof targetObj == "string")
		targetObj = document.getElementById(targetObj);
	if (!targetObj)
		return -1;
	advAJAX.get(
	{
		url: url,
		onSuccess : function(obj)
		{
			targetObj.innerHTML = obj.responseText;
		}
	});
};

advAJAX.scan = function()
{
	var obj = document.getElementsByTagName("a");
	for (var i = 0; i < obj.length;)
	{
		if (obj[i].getAttribute("rel") == "advancedajax" && obj[i].getAttribute("href") !== null)
		{
			var url = obj[i].getAttribute("href");
			var div = document.createElement("div");
			div.innerHTML = obj[i].innerHTML;
			div.className = obj[i].className;
			var parent = obj[i].parentNode;
			parent.insertBefore(div, obj[i]);
			parent.removeChild(obj[i]);
			advAJAX.download(div, url);
		} else i++;
	}
};

advAJAX.handleRequest = function(requestType, args)
{
	if (typeof args == "undefined" || args == null)
		return -1;
	var request = new advAJAX();
	window.advajax_obj = request;
	request.method = requestType;
	request.handleArguments(args);
	return request.run();
};

advAJAX._defaultParameters = new Object();
advAJAX.setDefaultParameters = function(args)
{
	advAJAX._defaultParameters = new Object();
	for (a in args)
		advAJAX._defaultParameters[a] = args[a];
};

advAJAX._groupData = new Object();