var qmo = {
	populateFields : function() {
		qmo.populateForumPosts();
		qmo.populateEvents();
		qmo.populateQMONews();
		qmo.populateHowHelp();
	},
	populateForumPosts : function() {
		var numPosts = 5; // show top 5 topics
		var postBox = $('qa-qmo-forumposts');
		qaTools.showHideLoadingMessage(postBox, true);
		var url = qaMain.urlbundle.getString("qa.extension.url.qmo.forum_topics");
		var callback = function(feed) {
			var items = feed.items;
			qaTools.showHideLoadingMessage(postBox, false);
			if (items.length < numPosts) 
				numPosts=items.length;
			for (var i=0; i<numPosts; i++) {
				var item = items.queryElementAt(i, Ci.nsIFeedEntry);
				if (item != null) {
					qmo.populateLinkBox(postBox, 
						[{text : item.title.plainText(), url : item.link.resolve("")}], 
						64);
				}
			}
		};
		qaTools.fetchFeed(url, callback);
	},
	populateEvents : function() {
		var numEvents = 5; // show 5 events
		var eventBox = $('qa-qmo-events');
		qaTools.showHideLoadingMessage(eventBox, true);
		var url = qaMain.urlbundle.getString("qa.extension.url.qmo.upcomingEvents");
		var callback = function(feed) {
			var items = feed.items;
			qaTools.showHideLoadingMessage(eventBox, false);
			if (items.length < numEvents)
				numEvents=items.length;
			for (var i=0; i<numEvents; i++) {
				var item = items.queryElementAt(i, Ci.nsIFeedEntry);
				if (item != null) {
					qmo.populateLinkBox(eventBox, 
						[{text : item.title.plainText(), url : item.link.resolve("")}], 
						37);
				}
			}
		};
		qaTools.fetchFeed(url, callback);
	},
	populateQMONews : function() {
		var box = $('qa-qmo-latest');
		var url = qaMain.urlbundle.getString("qa.extension.url.qmo.news");
		qaTools.showHideLoadingMessage(box, true);
		var callback = function(feed) {
			var items = feed.items;
			var item = items.queryElementAt(0, Ci.nsIFeedEntry);
			qaTools.showHideLoadingMessage(box, false);
			if (item != null) { // just grab the first item
				var content = item.summary;
				var fragment = content.createDocumentFragment(box);
				
				box.appendChild(fragment);
			}
		}
		qaTools.fetchFeed(url, callback);
	},
	populateHowHelp : function() {
		var box = $('qa-qmo-help');
		var url = qaMain.urlbundle.getString("qa.extension.url.qmo.howhelp");
		qaTools.showHideLoadingMessage(box, true);
		var callback = function(feed) {
			var items = feed.items;
			var item = items.queryElementAt(0, Ci.nsIFeedEntry);
			qaTools.showHideLoadingMessage(box, false);
			if (item != null) { // just grab the first item
				var content = item.summary;
				var fragment = content.createDocumentFragment(box);
				
				box.appendChild(fragment);
			}
		}
		qaTools.fetchFeed(url, callback);
	},
	populateLinkBox : function(box, links, chars) {
		var list = box.childNodes[1];
		for (var i=0; i<links.length; i++) {
			var elem = list.appendChild(document.createElementNS(qaMain.htmlNS,"li"));
			var a = elem.appendChild(document.createElementNS(qaMain.htmlNS,"a"));
			
			// limit text to chars characters:
			var text = links[i].text;
			if (chars && chars>0 && text.length > chars) {
				a.setAttribute("tooltiptext", text);
				text = text.substring(0, chars-3)+"...";
			}
			
			a.textContent = text;
			a.href = links[i].url;
			a.target = "blank_";
		}
	},
};

function $() {
  var elements = new Array();
  for (var i = 0; i < arguments.length; i++) {
    var element = arguments[i];
    if (typeof element == 'string')
      element = document.getElementById(element);
    if (arguments.length == 1)
      return element;

    elements.push(element);
  }
  return elements;
}