/**
 * @author Francesco
 */

/**
 * @class HistoryData
 */
function HistoryData(m, i, f, h)
{
	this.mod = parseInt(m);
	this.istanza = i;
	this.nome_funzione = f;
	this.html = h;
	this.htmlCache = "";
	this.args = new Array();
}

/**
 * @class HistorySet
 */
function HistorySet()
{
	this.browserHistory = new Array();

	this.viewHistory = function() // Funzione di DEBUG
	{
		var tmp = "";
		for (var i in this.browserHistory)
			tmp += (i + " - " + this.browserHistory[i].istanza + "." + this.browserHistory[i].nome_funzione) + "\n";
		alert(tmp);
	}
	
	this.getBackHistory = function()
	{
		if (this.browserHistory.length <= 1) return;
		var getNow = new HistoryData();
		getNow = this.browserHistory[this.browserHistory.length - 2];

		if (getNow.html === true)
		{
			document.getElementById("content").innerHTML = getNow.htmlCache;

			try { this.browserHistory.pop(); }
			catch (e) {}

			return;
		}

		var istruzione = new String(getNow.istanza + "." + getNow.nome_funzione + "(");
		for (var k = 0; k < getNow.args.length; k++)
		{
			if (getNow.args[k] == "null" || getNow.args[k] == "undefined")
				istruzione += getNow.args[k];
			else istruzione += "'" + getNow.args[k] + "'";

			if ((k + 1) < getNow.args.length)
				istruzione += ",";
		}

		istruzione += ");";

		try { this.browserHistory.pop();this.browserHistory.pop(); }
		catch (e) {}

		eval(istruzione.valueOf());
	}
}

var _historyset = new HistorySet();

/**
 * @class AjaxModule
 */
function AjaxModule() {}

AjaxModule.prototype.createXMLHttpRequest = function()
{
	if (typeof XMLHttpRequest != "undefined")
	{ return new XMLHttpRequest(); }
	else if (window.ActiveXObject)
	{
		var axoVersions = ["MSXML2.XMLHttp.6.0", "MSXML2.XMLHttp.3.0", "Microsoft.XMLHttp"];
		
		for (var i = 0; i < axoVersions.length; i++)
		{
			try
			{
				var xmlobj = new ActiveXObject(axoVersions[i]);
				return xmlobj;
			} catch (e) {}
		}
	}

	throw new Error("Impossibile inizializzare l'oggetto XMLHttp.");
}

AjaxModule.prototype.loadingSrc = "/immagini/loading2.gif";
AjaxModule.prototype.setLoadingSrc = function(src)
{
	AjaxModule.prototype.loadingSrc = src;
}

AjaxModule.prototype.loadingTarget = document.body;
AjaxModule.prototype.setLoadingTarget = function(target)
{
	var err = new String("Target non valido, impossibile gestire correttamente la risposta!");
	if (typeof(target) == "object" || typeof(target) == "function")
	{
		try { AjaxModule.prototype.loadingTarget = target; }
		catch (e) { throw new Error(err); }
	}
	else throw new Error(err);
}

AjaxModule.prototype.loadingGIF = function()
{
	var contentHTML = '<img src="' + AjaxModule.prototype.loadingSrc + '" border="0" title="Loading ..." />';
	AjaxModule.prototype.loadingTarget.innerHTML = contentHTML;
}

AjaxModule.prototype.params = [];
AjaxModule.prototype.target = document.body;
AjaxModule.prototype.xmlhttp = AjaxModule.prototype.createXMLHttpRequest();

AjaxModule.prototype.clearParams = function()
{ AjaxModule.prototype.params = []; }

AjaxModule.prototype.setTarget = function(target)
{
	var err = new String("Target non valido, impossibile gestire correttamente la risposta!");
	if (typeof(target) == "object" ||
		typeof(target) == "function")
	{
		try { AjaxModule.prototype.target = target; }
		catch (e) { throw new Error(err); }
	}
	else throw new Error(err);
}

AjaxModule.prototype.setHistory = function()
{
	var setNow = new HistoryData();

	 for(var i = 4; i < arguments.length; i++)
		setNow.args.push(arguments[i]);

	setNow.mod = arguments[0];
	setNow.istanza = arguments[1];
	setNow.nome_funzione = arguments[2];
	setNow.html = arguments[3]; // Attiva Cache

	_historyset.browserHistory.push(setNow);
}

AjaxModule.prototype.sendRequest = function()
{
	var pars = new String();

	for (var i in AjaxModule.prototype.params)
	{
	    pars += encodeURIComponent(i) + "=";
	    pars += encodeURIComponent(AjaxModule.prototype.params[i]) + "&";
	}

	AjaxModule.prototype.clearParams();
	pars = pars.substr(0, (pars.length - 1));
	AjaxModule.prototype.xmlhttp.send(pars);
}

AjaxModule.prototype.makeLoading = true;

AjaxModule.prototype.makeRequest = function(sPage, mL)
{
	if (mL === true)
		AjaxModule.prototype.makeLoading = false;
	else AjaxModule.prototype.makeLoading = true;

	AjaxModule.prototype.xmlhttp.open("POST", sPage, true);
	AjaxModule.prototype.xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
	AjaxModule.prototype.xmlhttp.onreadystatechange = AjaxModule.prototype.handleResponse;
	AjaxModule.prototype.sendRequest();
}

AjaxModule.prototype.handleResponse = function()
{
	if (AjaxModule.prototype.xmlhttp.readyState >= 1 &&
		AjaxModule.prototype.xmlhttp.readyState <= 3)
	{
		if (AjaxModule.prototype.makeLoading === true)
			AjaxModule.prototype.loadingGIF();
	}
	else if (AjaxModule.prototype.xmlhttp.readyState == 4)
	{
		if (AjaxModule.prototype.xmlhttp.status == 200)
		{
			var indB = _historyset.browserHistory.length - 1;
			var response = AjaxModule.prototype.xmlhttp.responseText;

			if (indB >= 0)
				_historyset.browserHistory[indB].htmlCache = response;

			if (typeof(AjaxModule.prototype.target) == "object")
				AjaxModule.prototype.target.innerHTML = response;
			else if (typeof(AjaxModule.prototype.target) == "function")
				AjaxModule.prototype.target(response);
			else throw new Error("Target non valido, impossibile gestire correttamente la risposta!");
		}
		else
		{
			try
			{
				var contentHTML = "<b>Errore durante il trasferimento dati.</b>";
				contentHTML += "<br />" + AjaxModule.prototype.xmlhttp.statusText;
				contentHTML += " (" + AjaxModule.prototype.xmlhttp.status + ")";
				document.getElementById(AjaxModule.prototype.target).innerHTML = contentHTML;
			} catch (e) {}
		}
	}
}

//--- Metodi per la lettura dinamica delle Form HTML
AjaxModule.prototype.getSelected = function(opt)
{
	var selected = new Array();
	var index = 0;

	for (var intLoop = 0; intLoop < opt.length; intLoop++)
	{
		if ((opt[intLoop].selected) || (opt[intLoop].checked))
		{
			index = selected.length;
			selected[index] = new Object;
			selected[index].value = opt[intLoop].value;
			selected[index].index = intLoop;
		}
	}

	return selected;
}

AjaxModule.prototype.outputSelected = function(opt, p)
{
	var sel = AjaxModule.prototype.getSelected(opt);
	var strSel = "";

	var cont = 0;
	for (var item in sel)       
	{
		cont++;
		AjaxModule.prototype.params[p + "_" + cont] = sel[item].value;
	}
	AjaxModule.prototype.params["n_" + p] = cont;
}

AjaxModule.prototype.form_read = function(nome_form)
{
	var oForm = document.getElementById(nome_form);

	for (var i = 0; i < oForm.elements.length; i++)
	{
		var oField = oForm.elements[i];

		switch (oField.type)
		{
			case "checkbox" :
			case "radio" :
				if (oField.checked)
					AjaxModule.prototype.params[oField.id] = "1";
				else AjaxModule.prototype.params[oField.id] = "0";
				break;

			case "text" :
			case "hidden" :
			case "password" :
			case "textarea" :
			case "select-one" :
				AjaxModule.prototype.params[oField.id] = oField.value;
				break;

			case "select-multiple" :
				AjaxModule.prototype.outputSelected(oField.options, oField.id);
				break;
		}
	}
}