// global flag
var isIE = false;

// global request and XML document objects
var req;

//MAIN TICKER FUNCTION
//SET PREFERENCE VARIABLES
var myTimer;
var theCharacterTimeout = 50;
var theStoryTimeout = 5000;
// Ticker startup function
function startTicker() {
	//clear the ticker timer
	window.clearTimeout(myTimer);
	// Define run time values
	//Feed Name
	//document.getElementById("whichFeed").innerHTML = '<small><a href="' + req.responseXML.getElementsByTagName("link")[0].firstChild.nodeValue + '">' + req.responseXML.getElementsByTagName("title")[0].firstChild.nodeValue + '<\/a><\/small>';
	//Feed Date
	//document.getElementById("feedDate").innerHTML = '<small>' + req.responseXML.getElementsByTagName("lastBuildDate")[0].firstChild.nodeValue + '<\/small>';
	//Get the Items array
	items = req.responseXML.getElementsByTagName("item");
	theItemCount = items.length;
	theCurrentStory = -1;
	theCurrentLength = 0;
	
	// Locate base objects
	if (document.getElementById) {
			//Write the anchor text for the ticker
			document.getElementById("details").innerHTML = '<h3><a id="tickerAnchor" href="#"><\/a><\/h3><p><span id="tickerStory"><\/span><\/p>';
			theAnchorObject = document.getElementById("tickerAnchor");
			theStoryObject = document.getElementById("tickerStory");
			runTheTicker();
		} else {
			//return true;
	}
}

// Ticker main run loop function
function runTheTicker() {

	var myTimeout;
	// Go for the next story data block
	if(theCurrentLength == 0) {
		theCurrentStory++;
		theCurrentStory = theCurrentStory % theItemCount;
		
		theStoryHeader = getElementTextNS("", "title", items[theCurrentStory], 0);
		theStorySummary = getElementTextNS("", "description", items[theCurrentStory], 0);
		theStorySummary = theStorySummary.substring(0,100) + '..' ;
		theTargetLink = getElementTextNS("", "link", items[theCurrentStory], 0);

		theAnchorObject.innerHTML = theStoryHeader;
		theAnchorObject.href = theTargetLink;
		theAnchorObject.target = '_blank';

	}
	// Stuff the current ticker text into the anchor
	theStoryObject.innerHTML = theStorySummary.substring(0,theCurrentLength);
	// Modify the length for the substring and define the timer
	if(theCurrentLength < theStorySummary.length) {
		theCurrentLength++;
		myTimeout = theCharacterTimeout;
	} else {
		theCurrentLength = 0;
		myTimeout = theStoryTimeout;
	}
	// Call up the next cycle of the ticker
	myTimer = window.setTimeout("runTheTicker()", myTimeout);
}

// retrieve XML document (reusable generic function);
function loadXMLDoc(url) {
	// Display loading flag
	startLoadFlag();
	// branch for native XMLHttpRequest object
	
	if (window.XMLHttpRequest) {
		req = new XMLHttpRequest();
		req.onreadystatechange = processReqChange;
		req.open("GET", url, true);
		req.send(null);
	// branch for IE/Windows ActiveX version
	} else if (window.ActiveXObject) {
		isIE = true;
		req = new ActiveXObject("Microsoft.XMLHTTP");
		if (req) {
			req.onreadystatechange = processReqChange;
			req.open("GET", url, true);
			req.send();
		}
	}
}

// handle onreadystatechange event of req object
function processReqChange() {
	// only if req shows "loaded"
	if (req.readyState == 4) {
		// only if "OK"
		if (req.status == 200) {
				
			stopLoadFlag();
			startTicker();
		} else {
			// Stop displaying loading flag
			stopLoadFlag();
			alert("There was a problem retrieving the XML data:\n" + req.statusText);
		}
	}
}

// DISPLAY LOADING ANIMATION
function startLoadFlag() {
	/*document.getElementById('details').innerHTML = '<p id="LoadMsg"><img src="http://www.reporteinmobiliario.com/rssapp/img/loadani.gif" alt="" width="50" height="50" /><\/p>';*/
	document.getElementById('details').innerHTML = '<p id="LoadMsg">Cargando Noticias..<\/p>';
}

// HIDE LOADING ANIMATION
function stopLoadFlag() {
	document.getElementById('details').innerHTML = "";
}

// retrieve text of an XML document element, including
// elements using namespaces
function getElementTextNS(prefix, local, parentElem, index) {
	var result = "";
	if (prefix && isIE) {
		// IE/Windows way of handling namespaces
		result = parentElem.getElementsByTagName(prefix + ":" + local)[index];
	} else {
		// the namespace versions of this method
		// (getElementsByTagNameNS()) operate
		// differently in Safari and Mozilla, but both
		// return value with just local name, provided
		// there aren't conflicts with non-namespace element names
		result = parentElem.getElementsByTagName(local)[index];
	}
	if (result) {
		// get text, accounting for possible
		// whitespace (carriage return) text nodes
		if (result.childNodes.length > 1) {
			return result.childNodes[1].nodeValue;
		} else {
			return result.firstChild.nodeValue;
		}
	} else {
		return "";
	}
}