// By default call the leftcolumn ajax.
var AJAXName = '';

var autoRefreshExecuter = null;
var autoRefreshFrequency = 0;
var refreshCounter = 0;
var insideRefresh = 0;

function onBeforeRefreshTimer() {
	insideRefresh = 1;

	var refreshIndication = document.getElementById("refreshthrobber");
	if (refreshIndication) refreshIndication.style.display = 'inline';
}

function onRefresh() {
	var refreshIndication = document.getElementById("refreshthrobber");
	if (refreshIndication) refreshIndication.style.display = 'none';

	insideRefresh = 0;
	refreshCounter = 0;
}

function addRefreshEvent(func) {
  if (typeof(onRefresh) == 'function') {
	var oldonrefresh = onRefresh;
	onRefresh = function() {
		oldonrefresh();
		func();
	}
  }
}

function addBeforeRefreshTimer(func) {
  if (typeof(onBeforeRefreshTimer == 'function')) {
	var oldonbeforerefreshtimer = onBeforeRefreshTimer;
	onBeforeRefreshTimer = function() {
		func();
		oldonbeforerefreshtimer();
	}
  }
}

function onRefreshTimer()
{
	if (refreshCounter == autoRefreshFrequency && !insideRefresh) {
		if (typeof(onBeforeRefreshTimer) == 'function') {
			onBeforeRefreshTimer();
		}

		if (typeof(onRefresh) == 'function') {
			if (typeof(ajaxEngine)=='object' && typeof(AJAXName) == 'string' || AJAXName != '') {
				ajaxEngine.sendRequest(AJAXName, {onComplete: onRefresh});
			} else {
				onRefresh();
			}
		}
	} else if (!insideRefresh) {
		refreshCounter = refreshCounter + 1;
	}
}

function stopRefreshTimer()
{
	if (autoRefreshExecuter != null && typeof(autoRefreshExecuter) == 'object') {
		autoRefreshExecuter.currentlyExecuting = true; // setting this to true stop the executer.
	}
	refreshCounter = 0;
}

function restartRefreshTimer()
{
	if (autoRefreshExecuter != null && typeof(autoRefreshExecuter) == 'object') {
		autoRefreshExecuter.currentlyExecuting = false; // setting this to true stop the executer.
	}
	refreshCounter = 0;
}

function showRefreshHints(parentNodeId)
{
	refreshCount = 0;

	nodes = document.getElementsByClassName('refreshhint',parentNodeId);
	refreshCount = nodes.length;

	for (var nodei=0;nodei<nodes.length;nodei++) {
		var node=nodes[nodei];
		if (node.nodeName=="SPAN") {
			node.style.display="inline";
		} else {
			node.style.display="block";
		}
	}

	return (refreshCount);
}

function changeRefreshState()
{
	if (autoRefreshExecuter != null && typeof(autoRefreshExecuter) == 'object') {
		if (autoRefreshExecuter.currentlyExecuting) {
			restartRefreshTimer();
		} else {
			stopRefreshTimer();
		}
	}

	var autoRefreshStatusSpan = document.getElementById("autoRefresh");
	if (autoRefreshStatusSpan) {
		if (autoRefreshStatusSpan.innerHTML == "On") {
			autoRefreshStatusSpan.innerHTML = "Off";
		} else {
			autoRefreshStatusSpan.innerHTML = "On";
		}
	}
}

function NeedRefresh()
{
	if (typeof(ajaxEngine)!='undefined') {
		var refreshCount = 0;
/*		nodes = document.getElementsByClassName('refreshhint', 'maincontent');
		refreshCount = nodes.length;
		nodes = document.getElementsByClassName('refreshhint', 'leftcolumn');
		refreshCount += nodes.length;
*/
		refreshCount = showRefreshHints('leftcolumn');
		refreshCount += showRefreshHints('maincontent');
		if (refreshCount) {
	
			var autoRefresh = 0;
		
			var autoRefreshStatusSpan = document.getElementById("autoRefresh");
			if (autoRefreshStatusSpan) {
				if (autoRefreshStatusSpan.innerHTML == "On") {
					autoRefresh = 1;
				}
			}

			var autoRefreshFrequencySpan = document.getElementById("autoRefreshInterval");
			if (autoRefreshFrequencySpan) {
				autoRefreshFrequency = parseInt(autoRefreshFrequencySpan.innerHTML);
			}

			if (autoRefreshFrequency > 0) {
				autoRefreshExecuter = new PeriodicalExecuter(onRefreshTimer, 1);
				addUnloadEvent(stopRefreshTimer);

				if (autoRefreshFrequency > 0) {
					timestampDiv = document.getElementById('timestamp');
					if (timestampDiv) {
						ajaxEngine.registerAjaxElement('timestamp');
					}
					systeminfoDiv = document.getElementById('systeminfo');
					if (systeminfoDiv) {
						ajaxEngine.registerAjaxElement('systeminfo');
					}
					leftColumnDiv = document.getElementById('leftcolumn');
					if (leftColumnDiv) {
						ajaxEngine.registerRequest('LeftColumn','/ajax/leftcolumn.asp');
						if (typeof(AJAXName) != 'string' || AJAXName == '') {
							AJAXName = 'LeftColumn';
						}
					}

					if (!autoRefresh) {
						stopRefreshTimer();
					}
				}
			}
		}
	}
}

addLoadEvent(NeedRefresh);