//	TitanWEB WCM v3.3 - RSS Reader JavaScript Library
//	Usage: 	Uses AJAX to call and display an external RSS news feed on a TitanWEB WCM Psage
//   Author: 	M. Dang, Kryos Systems
//	Created:	November 2006
	function AjaxInteraction(url, callback, postContent) {
		
		var req = init();
		req.onreadystatechange = processRequest;

	
		function init() {
			var xmlhttp ;
			if (window.ActiveXObject) {
				return new ActiveXObject("Microsoft.XMLHTTP");
			} else if (window.XMLHttpRequest != null) {
				xmlhttp = new XMLHttpRequest();
				xmlhttp.overrideMimeType("text/xml");
			} 
			
			return xmlhttp;
		}
	
		function processRequest() {
			if (req.readyState == 4) {
				if (req.status == 200) {
					if (callback) callback(req.responseXML);
				} else {
					//alert(req.status);
					displayErrorMessage(strTWWCMErrorNA);
				}
			}
		}

		this.doGet = function() {
			try {
				req.open("GET", url, true);
				req.send(null);
			} catch (e) {
				//alert("error calling doGet: " + e);
				displayErrorMessage(strTWWCMErrorNA);
			}
		}
	
		this.doPost = function() {
			req.open("POST", url, true);
			req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
			req.send(postContent);
		}
	
	}

	function openRssAgent(url, titlesOnly, maxItems, newWindowLink, displayDate,title) {
	/*******changes start********/
		if(url.charAt(0)=="/"){
		DrawLocalRSS(title, url, document.getElementById("rssHtmlOutput"), parseInt(maxItems), false,(titlesOnly=="true"),(newWindowLink=="true"),(displayDate=="false"));
		}else{
		/********changes end************/
			var serviceUrl = urlpath_js + "/rssreader?openagent";
			serviceUrl += "\&url=" + url;
			serviceUrl += "\&titlesOnly=" + titlesOnly;
			serviceUrl += "\&maxItems=" + maxItems;
			serviceUrl += "\&newWindowLink=" + newWindowLink; 
			serviceUrl += "\&displayDate=" + displayDate;
		
			var ai = new AjaxInteraction(serviceUrl, updateRssData, null);
			ai.doGet();	
		}
	}


	function updateRssData(xmlDoc) {
	
		var rssHtmlOutput = document.getElementById("rssHtmlOutput"); 
		
		// Check if RSS data was retrieved properly.  If not, display the appropriate
		// error message.
		var errorElement = xmlDoc.getElementsByTagName("titanWebError");
		if (errorElement != null && errorElement.length > 0) {
			displayErrorMessage(strTWWCMErrorNA, rssHtmlOutput);
			return;
		}
		
		var stories = xmlDoc.getElementsByTagName("story");
	
		// stories should never be empty if the ajax call is completed.  
		// However, if stories is empty -- there is in all likelyhood, an xml handling error or agent error.
		if (stories == null || stories.length == 0) {
			displayErrorMessage(strTWWCMErrorNA, rssHtmlOutput);
			return;
		} 

		for (i=0;i<stories.length;i++)
		{
			var newWindow = stories[i].getElementsByTagName("newWindow")[0].firstChild.nodeValue;
			var storyHTML = "<p><a href=\""+stories[i].getElementsByTagName("link")[0].firstChild.nodeValue+ "\"";
			if (newWindow.indexOf("true") >=0) storyHTML += " target=\"_blank\"";
			storyHTML += ">";
			storyHTML += "<strong>"+stories[i].getElementsByTagName("title")[0].firstChild.nodeValue +"</strong></a>";
			var date = stories[i].getElementsByTagName("date");
			if (date != null && date.length > 0) 
				storyHTML += " - <i>" + date[0].firstChild.nodeValue +"</i>";
			storyHTML += "<br>";
			var abstractDesc = stories[i].getElementsByTagName("abstract");
			if (abstractDesc != null && abstractDesc.length > 0) {
				storyHTML += abstractDesc[0].firstChild.nodeValue;
			}
			storyHTML += "</p>";
			rssHtmlOutput.innerHTML += storyHTML;

		}
	}
	
	function displayErrorMessage(errorMessage, targetTag) {
			
		var errorMessage = "<p>" + errorMessage + "</p>";
		targetTag.innerHTML += errorMessage;
	
	}

//draws rss
function DrawLocalRSS(title, url, container, maxItems, hideSubscribe,titlesOnly,newWindowLink,noDate){
	if(!hideSubscribe){
		var head = document.getElementsByTagName("head")[0];
		var link = document.createElement("link");
		link.setAttribute("rel","alternate");
		link.setAttribute("type","application/rss+xml");
		link.setAttribute("href",url);
		link.setAttribute("title",new String(title));
		head.appendChild(link);
	}
	
	container.className = "RSSDisplay";
	var o = new AjaxInteraction(url, function(xmlDoc){
		try{
			var feed = xmlIntoObject(xmlDoc);	
			var items = feed.rss[0].channel[0].item;
			while(container.childNodes.length>0)container.removeChild(container.childNodes[0]);
			if(!items || items.length==0){
				container.appendChild(document.createTextNode("No Items Found"));
			}else{
				var max = (maxItems) ? Math.min(maxItems,items.length) : items.length;
				for(var i = 0 ; i < max ; i++){
				var p = document.createElement("p");
				var a = p.appendChild(document.createElement("a"));
				a.href = items[i].guid[0]._text;
				if(newWindowLink)a.target="_blank";
				var strong = a.appendChild(document.createElement("strong"));
				strong.appendChild(document.createTextNode(items[i].title[0]._text));
				if(!titlesOnly){
					if(!noDate && items[i]['pubDate']){
						p.appendChild(document.createTextNode(" - "));
						var italic = p.appendChild(document.createElement("i"));
						italic.appendChild(document.createTextNode(items[i].pubDate[0]._text));
					}
					p.appendChild(document.createElement("br"));
					p.appendChild(document.createTextNode(items[i].description[0]._text));
				}
				container.appendChild(p);
				}
				
			}
		}catch(e){
		}
	});
	o.doGet();
}


function xmlIntoObject(xmlDoc){
	var recurser = new Object();
	recurser.process = function(o,nodes){
		for(var i = 0 ; i < nodes.length ; i++){
			if(nodes[i].nodeType==3){
				o._text += nodes[i].nodeValue;
			}else if(nodes[i].nodeType==1){
				var n = nodes[i].nodeName;
				if(o[n]){
					o[n].push(new Object());
				}else{
					o[n] = new Array(new Object());
				}
				o[n][o[n].length-1]._text = "";
				o[n][o[n].length-1]._cdata = "";
				 if(nodes[i].childNodes.length>0){
					this.process(o[n][o[n].length-1], nodes[i].childNodes);
				}
			}else if(nodes[i].nodeType==4){
				o._cdata += nodes[i].nodeValue;
			}
		}
	};
	var o = new Object();
	recurser.process(o,xmlDoc.childNodes);
	return o;
}