var Spry; if (!Spry) Spry = {};
if (!Spry.Utils) Spry.Utils = {};

Spry.Utils.submitForm = function(form, callback, opts, async)
{
	
	if (!form)
		return true;
		
	if(!async)
		async = true;

	if ( typeof form == 'string' )
		form = document.getElementById(form) || document.forms[form];
	
	var frmOpts = {};
	frmOpts.method = form.method;
	frmOpts.url = form.action || document.location.href;

	frmOpts.enctype = form.enctype;

	Spry.Utils.setOptions(frmOpts, opts);
	
	var submitData = Spry.Utils.extractParamsFromForm(form, frmOpts.elements);
	
	if (frmOpts.additionalData)
		submitData += "&" + frmOpts.additionalData;

	if (frmOpts.enctype.toLowerCase() != 'multipart/form-data')
	{
		// Ajax submission of a form doesn't work for multipart/form-data!
		frmOpts.method = (frmOpts.method.toLowerCase() == "post") ? 'POST' : 'GET';
		if (frmOpts.method == "GET")
		{
			// Data will be submitted in the url.
			if (frmOpts.url.indexOf('?') == -1)
				frmOpts.url += '?';
			else
				frmOpts.url += '&';
			frmOpts.url += submitData;
		}
		else
		{
			// Send Content-Type header.
			if (!frmOpts.headers) frmOpts.headers = {};
			if (!frmOpts.headers['Content-Type'] || frmOpts.headers['Content-Type'].indexOf("application/x-www-form-urlencoded") ==-1 )
				frmOpts.headers['Content-Type'] = 'application/x-www-form-urlencoded';

			// Set the postData
			frmOpts.postData = submitData;
		}

		Spry.Utils.loadURL(frmOpts.method, frmOpts.url, async, callback, frmOpts);

		return false;
	}
	// Native submission when 'multipart/form-data' is used.
	return false;
};

Spry.Utils.extractParamsFromForm = function (form, elements)
{
	if (!form)
		return '';

	if ( typeof form == 'string' )
		form = document.getElementById(form) || document.forms[form];

	var formElements;
	if (elements)
		formElements = ',' + elements.join(',') + ',';

	var compStack = new Array(); // key=value pairs

	var el;
	for (var i = 0; i < form.elements.length; i++ )
	{
		el = form.elements[i];
		
		/*if (el.disabled || !el.name)
		{
			// Don't submit disabled elements.
			// Don't submit elements without name.
			continue;
		}*/

		if (!el.type)
		{
			// It seems that this element doesn't have a type set,
			// so skip it.
			continue;
		}

		if (formElements && formElements.indexOf(',' + el.name + ',')==-1)
			continue;
		
		switch(el.type.toLowerCase())
		{
			case 'text':
			case 'password':
			case 'textarea':
			case 'hidden':
			case 'submit':
				compStack.push(encodeURIComponent(el.name) + '=' + encodeURIComponent(el.value));
				break;
			case 'select-one':
				var value = '';
				var opt;
				if (el.selectedIndex >= 0) {
					opt = el.options[el.selectedIndex];
					value = opt.value || opt.text;
				}
				compStack.push(encodeURIComponent(el.name) + '=' + encodeURIComponent(value));
				break;
			case 'select-multiple':
				for (var j = 0; j < el.length; j++)
				{
					if (el.options[j].selected)
					{
						value = el.options[j].value || el.options[j].text;
						compStack.push(encodeURIComponent(el.name) + '=' + encodeURIComponent(value));
					}
				}
				break;
			case 'checkbox':
				if (!el.checked)
					compStack.push(encodeURIComponent(el.name) + '=' + encodeURIComponent(0));
			case 'radio':
				if (el.checked)
					compStack.push(encodeURIComponent(el.name) + '=' + encodeURIComponent(el.value));
				/*else
					compStack.push(encodeURIComponent(el.name) + '=' + encodeURIComponent(0));*/
				break;
			default:
			// file, button, reset
			break;
			}
		}
	return compStack.join('&');
};

Spry.Utils.msProgIDs = ["MSXML2.XMLHTTP.6.0", "MSXML2.XMLHTTP.5.0", "MSXML2.XMLHTTP.4.0", "MSXML2.XMLHTTP.3.0", "MSXML2.XMLHTTP", "Microsoft.XMLHTTP"];

Spry.Utils.createXMLHttpRequest = function()
{
	var req = null;
	try
	{
		// Try to use the ActiveX version of XMLHttpRequest. This will
		// allow developers to load file URLs in IE7 when running in the
		// local zone.

		if (window.ActiveXObject)
		{
			while (!req && Spry.Utils.msProgIDs.length)
			{
				try { req = new ActiveXObject(Spry.Utils.msProgIDs[0]); } catch (e) { req = null; }
				if (!req)
					Spry.Utils.msProgIDs.splice(0, 1);
			}
		}

		// We're either running in a non-IE browser, or we failed to
		// create the ActiveX version of the XMLHttpRequest object.
		// Try to use the native version of XMLHttpRequest if it exists.

		if (!req && window.XMLHttpRequest)
			req = new XMLHttpRequest();
	}
	catch (e) { req = null;	}

	if (!req)
		Spry.Debug.reportError("Failed to create an XMLHttpRequest object!" );

	return req;
};

Spry.Utils.loadURL = function(method, url, async, callback, opts)
{
	var req = new Spry.Utils.loadURL.Request();
	req.method = method;
	req.url = url;
	req.async = async;
	req.successCallback = callback;
	Spry.Utils.setOptions(req, opts);

	try
	{
		req.xhRequest = Spry.Utils.createXMLHttpRequest();
		if (!req.xhRequest)
			return null;

		if (req.async)
			req.xhRequest.onreadystatechange = function() { Spry.Utils.loadURL.callback(req); };

		req.xhRequest.open(req.method, req.url, req.async, req.username, req.password);

		if (req.headers)
		{
			for (var name in req.headers)
				req.xhRequest.setRequestHeader(name, req.headers[name]);
		}

		req.xhRequest.send(req.postData);

		if (!req.async)
			Spry.Utils.loadURL.callback(req);
	}
	catch(e)
	{
		if (req.errorCallback)
			req.errorCallback(req);
		else
			Spry.Debug.reportError("Exception caught while loading " + url + ": " + e);
		req = null;
	}

	return req;
};

Spry.Utils.loadURL.callback = function(req)
{
	if (!req || req.xhRequest.readyState != 4)
		return;
	if (req.successCallback /*&& (req.xhRequest.status == 200 || req.xhRequest.status == 0)*/)
		req.successCallback(req);
	else if (req.errorCallback)
		req.errorCallback(req);
};

Spry.Utils.loadURL.Request = function()
{
	var props = Spry.Utils.loadURL.Request.props;
	var numProps = props.length;

	for (var i = 0; i < numProps; i++)
		this[props[i]] = null;

	this.method = "GET";
	this.async = true;
	this.headers = {};
};

Spry.Utils.loadURL.Request.props = [ "method", "url", "async", "username", "password", "postData", "successCallback", "errorCallback", "headers", "userData", "xhRequest" ];

Spry.Utils.loadURL.Request.prototype.extractRequestOptions = function(opts, undefineRequestProps)
{
	if (!opts)
		return;

	var props = Spry.Utils.loadURL.Request.props;
	var numProps = props.length;

	for (var i = 0; i < numProps; i++)
	{
		var prop = props[i];
		if (opts[prop] != undefined)
		{
			this[prop] = opts[prop];
			if (undefineRequestProps)
				opts[prop] = undefined;
		}
	}
};

Spry.Utils.loadURL.Request.prototype.clone = function()
{
	var props = Spry.Utils.loadURL.Request.props;
	var numProps = props.length;
	var req = new Spry.Utils.loadURL.Request;
	for (var i = 0; i < numProps; i++)
		req[props[i]] = this[props[i]];
	if (this.headers)
	{
		req.headers = {};
		Spry.Utils.setOptions(req.headers, this.headers);
	}
	return req;
};

Spry.Utils.setOptions = function(obj, optionsObj, ignoreUndefinedProps)
{
	if (!optionsObj)
		return;

	for (var optionName in optionsObj)
	{
		if (ignoreUndefinedProps && optionsObj[optionName] == undefined)
			continue;
		obj[optionName] = optionsObj[optionName];
	}
};