AJAX_DEBUG = false;
JS_DEBUG = false;
REQUEST_FIRST = new Array("/index", "", "")
AJAX_HISTORY = new Array(REQUEST_FIRST);
AJAX_HISTORY_ITEM = 1;

/**
 * Xms error handler 
 * @TODO: must load as early as possible
 */
ERROR_HANDLER = function(description, pagename, lineno, name) {
	if(JS_DEBUG) {
		type = (name) ? name + ': ':'Error: ';
		alert(
			type  + description
			+'\n in ' + pagename
			+'\n (line ' + lineno + ')'
		);
	}
	return true;
}
/**
 * setting window error handler 
 * @TODO: must load as early as possible
 */
onerror = ERROR_HANDLER;

Ajax.Responders.register({
  onCreate: function() {
	Xms.showThrobber();
  }, 
  onComplete: function(transport) {
	Xms.hideThrobber();
  },
  onFailure:  function() {
	alert('Request failure. Try repeat action.');
	Xms.hideThrobber();
  }
});

/**
 * xms ajax call function based on prototype AJAX.Request
 */
call = function(requestpath, args, callback, reghistory)
{
	if(reghistory == undefined) reghistory = true;
	if(reghistory){
		pushAjaxRequest(requestpath, args, callback);
	}
	new Ajax.Request(
		document.location.href, 
		{
			postBody: 'requestpath=' + requestpath + '&args[]=' + Object.toJSON(args),
			method: 'post',
			onComplete: function(transport) {
				//alert(transport.responseText);
				if (transport.responseText.charAt(0) != '[') {
					Xms.hideThrobber();
					(AJAX_DEBUG) ? debug(transport.responseText) : '';
					return;
				}
				var jsonData = transport.responseText.evalJSON();
				if (jsonData == undefined) {
					Xms.hideThrobber();
					(AJAX_DEBUG) ? debug(transport.responseText) : '';
					return;
				} 
				if(!callback) {
					try {
						executeFunctionsArray(jsonData);
					} catch(err) {
						ERROR_HANDLER(errorInfo, errorInfo.fileName, errorInfo.lineNumber);
						return;
					}
				} else {
					try {
						if(null != transport.responseText.match("<html")) {
							Xms.hideThrobber();
							debug(transport.responseText);
						}
						eval(callback + '(' + transport.responseText + ')');
					} catch(err) {
						ERROR_HANDLER(errorInfo, errorInfo.fileName, errorInfo.lineNumber);
						return;
					}
                    
				}
			}
		}
	);
};
function getBase()
{
  var baseTag = document.getElementsByTagName("base");
  for(var i=0; i<baseTag.length; i++)
  {
		var baseHref = baseTag[i].href;
  }
  return baseHref;
}
/* third generation of ajax implementation in xms */
ajaxCall = function(action, args, options)
{
	var method   = 'post';
	var callback = false;
	var history  = false;
	var parameters = 'requestpath=' + action;
	if(args != undefined) {
		parameters += '&args[]=' + encodeURIComponent(Object.toJSON(args));
	} else {
		args = {};
	}
	if(options != undefined) {
		if(undefined != options['callback']) {
			callback = options['callback'];
		}
		if(undefined != options['history']) {
			history = options['history'];
		}
		if(undefined != options['method']) {
			method = options['method'];
		}
	}
	if(method == 'get') { 
		var i = 0;
		var uri = '';
		for (i in args) {
			if (args[i] != undefined) {
				uri += i + '/' + encodeURIComponent(args[i]) + '/';
			}
		}
		var location = action + '/' + uri;
		if(Prototype.Browser.IE) {
			return document.location.assign(getBase() + location);
		} else {
			return document.location.href = location; 
		}
	}
	new Ajax.Request(
		document.location.href, 
		{
			parameters: parameters,
			method: method,
			onComplete: function(transport) {
					if(!callback) {
						if (transport.responseText.charAt(0) != '[') {
						(AJAX_DEBUG) ? debug(transport.responseText) : '';
						return;
					}
					var jsonData = transport.responseText.evalJSON();
					if (jsonData == undefined) {
						(AJAX_DEBUG) ? debug(transport.responseText) : '';
						return;
					}
					try {
						executeFunctionsArray(jsonData); 
					} catch(err) {
						ERROR_HANDLER(errorInfo, errorInfo.fileName, errorInfo.lineNumber);
						return;
					}
				} else {
					try {
						if(null != transport.responseText.match("<html")) {
							debug(transport.responseText);
						}
						eval(callback + '(' + transport.responseText + ')');
					} catch(err) {
						ERROR_HANDLER(errorInfo, errorInfo.fileName, errorInfo.lineNumber);
						return;
					}
				}
			}
		}
	);
};

/* for old mode capatible */
makeCall = call;

/**
 * function to execute default xms json response - array of function with parametrs
 */
executeFunctionsArray = function(jsonData)
{
	if (jsonData == undefined) {
		debug(responseText); 
	} else {
		var i = 0;
		for(i=0; i < jsonData.length; i++) {
			var params = '';
			for(exec in jsonData[i]) {
				params = jsonData[i][exec];
				var arguments = '';
				var param = '';
				var m = 0;
				for(m=0; m < params.length; m++) {
					param = params[m];
					arguments += Object.toJSON(param) + ',';
				}
				arguments = arguments.substring(0, arguments.length-1);
				//alert(exec + '(' + arguments + ')');
				try {
					eval(exec + '(' + arguments + ')');
				} catch(errorInfo) {
					ERROR_HANDLER(errorInfo.message, errorInfo.fileName, errorInfo.lineNumber, errorInfo.name);
				}
			}
		}
		return;
	}
};

/**
 * xms debbuger for json response
 */
debug = function(message)
{
	if(null != message.match("<html")) {
		var iframe = document.createElement("iframe");
		iframe.id = 'debugWindow';
		iframe.allowTransparency = "true";
		iframe.src = '';
		iframed = document.body.appendChild(iframe);
		iframed.allowTransparency  = "true";
		var doc = iframe.document;
		if(iframe.contentDocument) {
			doc = iframe.contentDocument; // For NS6
		} else if(iframe.contentWindow) {
			doc = iframe.contentWindow.document; // For IE5.5 and IE6
		}
		// Put the content in the iframe
		doc.open();
		doc.writeln(message);
		doc.close();

		//doc.body.className = 'ajax';
		doc.getElementsByTagName("html")[0].className = 'ajax';
	} else {
		message = message.escapeHTML().gsub('\\\\n', '<br/>').gsub('\\n', '<br/>');

		var file = "";
		var windowName = 'Guru meditation'+new Date().getTime();
		var options = "toolbar=no, location=no, directories=no, status=yes, menubar=no, scrollbars=yes, resizable=yes, copyhistory=no";
		var debugWindow = window.open(file, windowName, options);

		debugWindow.document.body.style.backgroundColor = '#000';
		debugWindow.document.body.style.color = '#07FF00';
		debugWindow.document.body.innerHTML = '<pre><code>' + message + '</code></pre>';
	}
 };
/**
 * xms debbuger for json response
 */
cleanDebug = function(message)
{
	document.body.removeChild($('debugWindow'));
};

/**
 * common function to update div on page
 */
update = function(response)
{
	if(response == '') return;
	var wrapperInnerHTML = '';
	var regularExpresion = new RegExp('id="([^"]*)"');
	var matched = regularExpresion.exec(response);
	var firstId = matched[1];
	if (firstId == null) {
		alert('Cannot decode response:\n' + response);
		return false;
	}

	var element = $(firstId);
	if (element == null) {
		alert('Element ' + id + ' not found');
		return false;
	}

	var wrapper = $(firstId).up();
	if(undefined == wrapper) {
		alert('Element ' + id + ' must be wrapped in other element e.g. div or span');
		return false;
	}

	var wrapperTagName = (wrapper.tagName).toLowerCase();
	if(wrapperTagName == 'span') {
		wrapperInnerHTML = response.replace(/^<span>(.*)/i, '$1').replace(/(.*)<\/span>$/i, '$1');/* non html4.1 standart */
	} else if(wrapperTagName == 'div') {
		wrapperInnerHTML = response.replace(/^<div>(.*)/i, '$1').replace(/(.*)<\/div>$/i, '$1');
	} else {
		alert('Check you wrapper - it must be single span (not doctype standart) or div without any attribute');
		return false;
	}
	wrapper.innerHTML = '';
	Element.insert(wrapper, wrapperInnerHTML);
};

reload = function()
{
	location.reload();
};

pushAjaxRequest = function (requestpath, args, callback)
{
	if(!callback){
		callback = "";
	}
	var request = new Array(requestpath, args, callback);
	if(AJAX_HISTORY_ITEM == AJAX_HISTORY.length){
		AJAX_HISTORY.push(request);
		AJAX_HISTORY_ITEM += 1;
	}else if(AJAX_HISTORY_ITEM < AJAX_HISTORY.length){
		AJAX_HISTORY = AJAX_HISTORY.slice(0, AJAX_HISTORY_ITEM);
		AJAX_HISTORY.push(request);
		AJAX_HISTORY_ITEM += 1;
	}
	ajaxSetButtons();
};

ajaxGoBack = function ()
{
	if(AJAX_HISTORY.length > 1){
		if(AJAX_HISTORY_ITEM > 1){
			var request = AJAX_HISTORY[AJAX_HISTORY_ITEM - 2];
			AJAX_HISTORY_ITEM -= 1;
			call(request[0],request[1],request[2], false);
		}
	}
	ajaxSetButtons();
};
ajaxGoForward = function ()
{
	if(AJAX_HISTORY.length > 1){
		var request = AJAX_HISTORY[AJAX_HISTORY_ITEM];
		if(AJAX_HISTORY_ITEM < AJAX_HISTORY.length){
			AJAX_HISTORY_ITEM += 1;
		}
		call(request[0],request[1],request[2], false);
	}
	ajaxSetButtons();
};

ajaxLastRequest = function ()
{
	if(AJAX_HISTORY.length > 0){
		var request = AJAX_HISTORY[AJAX_HISTORY_ITEM - 1];
		call(request[0], request[1], request[2], false);
	}
}

ajaxSetButtons = function ()
{
	if($('goBack') != null && $('goNext') != null){
		if(AJAX_HISTORY_ITEM > 1){
			$('goBack').removeClassName('x-top-taskbuttons-scroller-left-disabled');
			$('goBack').addClassName('x-top-taskbuttons-scroller-left');            
		}else{
			$('goBack').removeClassName('x-top-taskbuttons-scroller-left');
			$('goBack').addClassName('x-top-taskbuttons-scroller-left-disabled');
		}
		if(AJAX_HISTORY_ITEM < AJAX_HISTORY.length){
			$('goNext').removeClassName('x-top-taskbuttons-scroller-right-disabled');
			$('goNext').addClassName('x-top-taskbuttons-scroller-right');
		}else{
			$('goNext').removeClassName('x-top-taskbuttons-scroller-right');
			$('goNext').addClassName('x-top-taskbuttons-scroller-right-disabled');
		}
	}

}