var gsti;
var currentStories = new Array();
var playing = true;

//getElementById
function $ei(id, parentNode) {
	parentNode = parentNode || document;
	return parentNode.getElementById(id);
}

//getAttribute
function $a(parentNode, att) {
	return parentNode.getAttribute(att);
}

//getElementByTagName
function $et(tagName, parentNode) {
	parentNode = parentNode || document;
	return parentNode.getElementsByTagName(tagName)[0];
}

//getElementByClassName
function $ec(className, parentNode) {
        parentNode = parentNode || document;
        elements = parentNode.getElementsByTagName("*");
        for (i=0; i<elements.length; i++) {
                if (elements[i].hasAttribute('class') && elements[i].getAttribute('class') == className) {
                        return elements[i];
                }
        }

}
//Xpath
function $xp(aNode, aExpr) {
	var xpe = new XPathEvaluator();
	var nsResolver = xpe.createNSResolver(aNode.ownerDocument == null ?
	aNode.documentElement : aNode.ownerDocument.documentElement);
	var result = xpe.evaluate(aExpr, aNode, nsResolver, 0, null);
	var found = [];
	var res;
	while (res = result.iterateNext())
		found.push(res);
	return found;
}
String.prototype.escapeEntities = function() {
	return this.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;").replace(/"/g, "&quot;");
}

function fetchData(url, handler) {
	//alert("inside fetchData");
        $ei('diggIndicator').style.display = '';
        $ei("diggIndicator").setAttribute('mode', 'undetermined');
	var request = Components.
              classes["@mozilla.org/xmlextras/xmlhttprequest;1"].
              createInstance();

	// QI the object to nsIDOMEventTarget to set event handlers on it:

	request.QueryInterface(Components.interfaces.nsIDOMEventTarget);
	request.addEventListener("load", handler, false);
        request.addEventListener("error", handleError, false);

	// QI it to nsIXMLHttpRequest to open and send the request:

	request.QueryInterface(Components.interfaces.nsIXMLHttpRequest);
	request.open("GET", url, true);
	request.send(null);
        //$ei('diggIndicator').style.display = '';

}

function handleError(e) {
        $ei('storyList').appendItem("!! Error accessing Digg !!");
        //$ei('diggIndicator').style.display = 'none';
}

function populateMenu(e) {
    XHR = e.target;
	data = decodeJson(XHR.responseText);
    topics = data.topics;
    containers = new Array();

    while ($ei('topicPopup').firstChild) {
            $ei('topicPopup').removeChild($ei('topicPopup').firstChild);
    }

    for (i=0; i<topics.length; i++) {
        topic = topics[i];
        menu = document.createElement('menu');
        menu.setAttribute('id', topic.short_name + 'Menu');
        menu.setAttribute('label', topic.name);
        menu.setAttribute('accesskey', topic.name.charAt(0));

        menupopup = document.createElement('menupopup');
        menupopup.setAttribute('id', topic.short_name + 'Popup');

        ['All', 'Popular', 'Upcoming'].forEach(
            function (label) {
                menuitem = document.createElement('menuitem');
                menuitem.setAttribute('label', label);
                menuitem.setAttribute('value', '/topic/' + topic.short_name + '/' + label.toLowerCase());
                menuitem.setAttribute('accesskey', label.charAt(0));
                menuitem.setAttribute('oncommand', "setEndPoint(this.value)");
                menupopup.appendChild(menuitem);
            }
        );
        menu.appendChild(menupopup);
        $ei('topicPopup').appendChild(menu);

        containers.push(topic.container);
    }

    while ($ei('containerPopup').firstChild) {
            $ei('containerPopup').removeChild($ei('containerPopup').firstChild);
    }

    filteredContainers = {name: [], short_name: []};
    for (i=0; i<containers.length; i++) {
        name = containers[i].name;
        short_name = containers[i].short_name;
        if (filteredContainers.name.indexOf(name) == -1) {
            filteredContainers.name.push(name);
            filteredContainers.short_name.push(short_name);
        }
    }

    for (i=0; i<filteredContainers.name.length; i++) {
        menu = document.createElement('menu');
        menu.setAttribute('id', filteredContainers.short_name[i] + 'Menu');
        menu.setAttribute('label', filteredContainers.name[i]);
        menu.setAttribute('accesskey', filteredContainers.name[i].charAt(0));

        menupopup = document.createElement('menupopup');
        menupopup.setAttribute('id', filteredContainers.short_name[i] + 'Popup');

        ['All', 'Popular', 'Upcoming'].forEach(
            function (label) {
                menuitem = document.createElement('menuitem');
                menuitem.setAttribute('label', label);
                menuitem.setAttribute('value', '/container/' +
                    filteredContainers.short_name[i] + '/' + label.toLowerCase());
                menuitem.setAttribute('accesskey', label.charAt(0));
                menuitem.setAttribute('oncommand', "setEndPoint(this.value)");
                menupopup.appendChild(menuitem);
            }
        );

        menu.appendChild(menupopup);
        $ei('containerPopup').appendChild(menu);
    }
    $ei('diggIndicator').style.display = 'none';
}

function populateStoryList(e) {
	XHR = e.target;
	//Application.console.log(XHR.responseText);
	data = decodeJson(XHR.responseText);
	stories = data.stories;

    while ($ei('storyList').firstChild) {
        $ei('storyList').removeChild($ei('storyList').firstChild);
    }

    var newStories = new Array();
    Application.console.log(stories.length);

	for (i=0; i<stories.length; i++) {
        story = stories[i];
        newStories.push(story.id);
		//Application.console.log(i + " " + story.title + " " + story.id);

        listitem = $ei('storyList').appendChild(document.createElement('richlistitem'));
        listitem.id = "story_" + story.id;

        htmllistitem = listitem.appendChild(
            document.createElementNS("http://www.w3.org/1999/xhtml","html:div"));
        htmllistitem.innerHTML = $ei('storyTitleFormat').innerHTML;

        storyTitle = listitem.getElementsByAttribute('class', 'storyTitle')[0];
        storyTitle.appendChild(document.createTextNode(story.title));

        htmllistitem.innerHTML += $ei('storyDetailsFormat').innerHTML;

        storyNew= listitem.getElementsByAttribute('class', 'storyNew')[0];

        if (currentStories.indexOf(story.id) != -1) {
            storyNew.style.textDecoration = "line-through";
            storyNew.style.backgroundColor = "black";
            storyNew.style.color = "white";
            storyNew.title = "Old";
        }
    }
    currentStories = newStories;

    //Adaptive update interval code START
    sum = 0;
    weights = [0.4, 0.3, 0.2, 0.1]
    for (i=0; i<4; i++) {
        if (stories[0].promote_date != null)
            diff = stories[i].promote_date - stories[i+1].promote_date;
        else
            diff = stories[i].submit_date - stories[i+1].submit_date;

        sum += weights[i]*diff;
    }
    updateInterval = Math.round(sum*1000);

    var prefs = Components.classes["@mozilla.org/preferences-service;1"].
            getService(Components.interfaces.nsIPrefBranch);

    previousUpdateInterval = prefs.getIntPref("extensions.diggsidebar.updateinterval")
    prefs.setIntPref("extensions.diggsidebar.updateinterval", updateInterval);

    updateIntervalDecay = prefs.getIntPref("extensions.diggsidebar.updateintervaldecay");

    if (previousUpdateInterval == updateInterval)
        prefs.setIntPref("extensions.diggsidebar.updateintervaldecay", (updateIntervalDecay + 1));
    else
        prefs.setIntPref("extensions.diggsidebar.updateintervaldecay", 0);

    window.clearTimeout(gsti);

    updateInterval = prefs.getIntPref("extensions.diggsidebar.updateinterval")
    updateIntervalDecay = prefs.getIntPref("extensions.diggsidebar.updateintervaldecay");

    timeout = Math.round(updateInterval*(Math.pow(1.5, updateIntervalDecay)));
    gsti = window.setTimeout(getStories, timeout);
    //Adaptive update interval code END

    $ei('diggIndicator').style.display = 'none';

    //prefs.setIntPref("extensions.diggsidebar.progress", 100);
    //$ei("diggIndicator").setAttribute('mode', 'determined');
    //$ei("diggIndicator").setAttribute('value', 100);
    //psi = window.setInterval(showProgress, Math.round(timeout/100));
    //window.setTimeout("window.clearInterval(psi)", timeout);
}

//function showProgress() {
//        var prefs = Components.classes["@mozilla.org/preferences-service;1"].
//                getService(Components.interfaces.nsIPrefBranch);
//        progress = prefs.getIntPref("extensions.diggsidebar.progress");
//        prefs.setIntPref("extensions.diggsidebar.progress", (progress - 1));
//
//        $ei("diggIndicator").setAttribute('value', (parseInt($ei("diggIndicator").getAttribute('value')) - 1));
//}

function populateDescription(e) {
	XHR = e.target;
    //Application.console.log(XHR.responseText);
	data = decodeJson(XHR.responseText);
	story = data.stories[0];

    now = new Date();
    if (story.promote_date != null)
        then = new Date(story.promote_date*1000);
    else
        then = new Date(story.submit_date*1000);
    diff = Math.max(now - then, 0)

    hr = Math.floor(diff/(1000*3600));
    min = Math.floor(diff/(1000*60)) - 60*hr;

    listitems = document.getElementsByTagName('richlistitem');
    for (i=0; i<listitems.length; i++) {
            listitems[i].getElementsByAttribute('class', 'storyDetails')[0].style.display = 'none';
            listitems[i].getElementsByAttribute('class', 'storyCEIcon')[0].src =
                "chrome://diggsidebar/content/image/up.jpg";
    }

    storyListItem = $ei('story_'+ story.id)
    storyDetails = storyListItem.getElementsByAttribute('class', 'storyDetails')[0];
    storyDate = storyListItem.getElementsByAttribute('class', 'storyDate')[0];
    storyStatus = storyListItem.getElementsByAttribute('class', 'storyStatus')[0];
    storyContainer = storyListItem.getElementsByAttribute('class', 'storyContainer')[0];
    storyTopic = storyListItem.getElementsByAttribute('class', 'storyTopic')[0];
    storyUserName = storyListItem.getElementsByAttribute('class', 'storyUserName')[0];
    storyDiggs = storyListItem.getElementsByAttribute('class', 'storyDiggs')[0];
    storyComments = storyListItem.getElementsByAttribute('class', 'storyComments')[0];
    storyDesc = storyListItem.getElementsByAttribute('class', 'storyDesc')[0];
    storyLink = storyListItem.getElementsByAttribute('class', 'storyLink')[0];
    storyHref = storyListItem.getElementsByAttribute('class', 'storyHref')[0];

    storyCEIcon = storyListItem.getElementsByAttribute('class', 'storyCEIcon')[0];
    storyRead = storyListItem.getElementsByAttribute('class', 'storyRead')[0];

	storyDate.innerHTML = ((hr > 0) && (min > 0)) ?
        (hr + " hr " + min + " mins ago") :
        ((hr == 0) && (min > 0)) ?
        (min + " mins ago") :
        ((hr == 0) && (min == 0)) ?
        "just now" : "";
	storyStatus.innerHTML = story.status.escapeEntities();
	storyContainer.innerHTML = story.container.name.escapeEntities();
	storyTopic.innerHTML = story.topic.name.escapeEntities();
	storyUserName.href = "http://digg.com/users/" + story.user.name;
	storyUserName.innerHTML = story.user.name.escapeEntities();
	storyDiggs.innerHTML = story.diggs;
	storyComments.innerHTML = story.comments;
	storyDesc.innerHTML = story.description.escapeEntities();
	storyLink.href = story.link;
	storyHref.href = story.href;

    storyCEIcon.src = "chrome://diggsidebar/content/image/down.jpg";
    storyRead.style.textDecoration = "line-through";
    storyRead.style.backgroundColor = "black";
    storyRead.style.color = "white";
    storyRead.title = "Read";
    storyNew.style.textDecoration = "line-through";
    storyNew.style.backgroundColor = "black";
    storyNew.style.color = "white";
    storyNew.title = "Old";

	storyDetails.style.display = 'block';

    $ei('diggIndicator').style.display = 'none';
}

function getStories() {
    var prefs = Components.classes["@mozilla.org/preferences-service;1"].
            getService(Components.interfaces.nsIPrefBranch);
    ep = prefs.getCharPref("extensions.diggsidebar.endpoint") || '';
    $ei('diggEndPoint').value = "digg" + ep;

    fetchData("http://services.digg.com/stories" + ep.replace(/\/all/g, '') +
        "?count=30" + "&type=json" +
		"&appkey=" + encodeURIComponent("http://diggsidebar.googlepages.com"),
		populateStoryList);
    //gsti = window.setTimeout(getStories,          prefs.getIntPref("extensions.diggsidebar.updateinterval"));
}

function getDescription(storyId) {
    if (storyId == null) return;
	fetchData("http://services.digg.com/story/" + storyId + "?type=json" +
		"&appkey=" + encodeURIComponent("http://diggsidebar.googlepages.com"),
		populateDescription);
}

function createMenu() {
        fetchData("http://services.digg.com/topics" + "?type=json" +
		"&appkey=" + encodeURIComponent("http://diggsidebar.googlepages.com"),
                populateMenu);
}

function openInTab(href) {
        var mainWindow = window.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
                   .getInterface(Components.interfaces.nsIWebNavigation)
                   .QueryInterface(Components.interfaces.nsIDocShellTreeItem)
                   .rootTreeItem
                   .QueryInterface(Components.interfaces.nsIInterfaceRequestor)
                   .getInterface(Components.interfaces.nsIDOMWindow);
        mainWindow.getBrowser().selectedTab = mainWindow.getBrowser().addTab(href);
}

function setEndPoint(ep) {
        var prefs = Components.classes["@mozilla.org/preferences-service;1"].
                getService(Components.interfaces.nsIPrefBranch);
        prefs.setCharPref("extensions.diggsidebar.endpoint", ep);
        window.clearTimeout(gsti);
        //window.clearInterval(psi);
        getStories();
}

function togglePlayPause() {
        if (playing) {
               window.clearTimeout(gsti);
               //window.clearInterval(psi);
               $ei('diggPlayPause').image = "chrome://diggsidebar/content/image/Play.png";
               $ei('diggPlayPause').setAttribute("tooltiptext", "Click to Start autoupdate");
               playing = false;
        } else {
                var prefs = Components.classes["@mozilla.org/preferences-service;1"].
                        getService(Components.interfaces.nsIPrefBranch);
                updateInterval = prefs.getIntPref("extensions.diggsidebar.updateinterval")
                updateIntervalDecay = prefs.getIntPref("extensions.diggsidebar.updateintervaldecay");

                timeout = Math.round(updateInterval*(Math.pow(1.5, updateIntervalDecay)));
                //newTimeout = Math.round(timeout*parseInt($ei("diggIndicator").getAttribute('value'))/100);
                gsti = window.setTimeout(getStories, timeout);
                //psi = window.setInterval(showProgress, Math.round(timeout/100));
                //window.setTimeout("window.clearInterval(psi)", newTimeout);
                $ei('diggPlayPause').image = "chrome://diggsidebar/content/image/Pause.png";
                $ei('diggPlayPause').setAttribute("tooltiptext", "Click to Pause autoupdate");
                playing = true;
        }
}

function decodeJson(string) {
  var json = Components.classes["@mozilla.org/dom/json;1"]
             .createInstance(Components.interfaces.nsIJSON);
  return json.decode(string);
};

/*TODO
 preferences
 toolbar button
 refresh button
 */
/*DONE
 v0.2
 added kdb navigation
 Added progressmeter
 added error notification
 added accesskeys
 added new story notification

 v0.2.1
 adaptive polling interval
 promote_date
 pause/play

 v0.5
 new ui
*/