///////////////////////////////////////////////////////////////////////////////

// RSS Reader from WRTKit examples, modified for Wikipedia widget

// RSS reader class

function RssReader(aFeedName, aFeedUrl, aFeedPresenter, aParent, aResponseParser){

	this.responseParser = aResponseParser;

	this.feedUpdateBroker = null;

	this.feedUpdateBrokerActive = false;

	this.feedName = aFeedName;

	this.feedURL = aFeedUrl;

	this.feedUpdateForced = false;

	this.feedItemControls = [];

	this.feedLastModified = 0;

	this.feedPresenter = aFeedPresenter;

	this.ignoreContent = false;

	this.hasData = false;

	this.startFromItem = 0;

	this.maxItems = 0;

	this.feedPresenter = 0;

	if ( aFeedName != undefined ) {

		this.init(aFeedName, aFeedUrl, aFeedPresenter, aParent, aResponseParser);

	}

}

RssReader.prototype = new ListView(null, null);

RssReader.prototype.init = function (aFeedName, aFeedUrl, aFeedPresenter, aParent, aResponseParser){

	this.previousView = aParent;

	this.feedPresenter = aFeedPresenter;

	this.responseParser = aResponseParser;

	this.feedName = aFeedName;

	this.feedURL = aFeedUrl;

	if (aFeedPresenter != null) {

		this.feedPresenter = aFeedPresenter;

		this.feedPresenter.init(this);

	} else {

		this.feedPresenter = new HtmlFeedPresenter(this);

	}

	ListView.prototype.init.call(this, null, null);

	var caption = new NavigationButton(1, "titlebar.png", aFeedName, true);

	caption.addEventListener("ActionPerformed", function(){wikiHomeView.show();});

	this.addControl(caption);

	// add pre-amble items (latest posts, new thread, reply etc)

	this.feedPresenter.addPreambleItems();

}	

// Callback function that gets called when a feed update has completed.

RssReader.prototype.feedUpdateCompleted = function(event){

	// remove cancel button

	this.setupSoftKeys();

	if (event.status == "ok") {

		// if there aren't any feed items yet, we'll hide the progress dialog

		// check if the feed has updated

		if (event.lastModified != this.feedLastModified) {

			// remember the last modified timestamp

			this.feedLastModified = event.lastModified;

			// feed fetched and parsed successfully

			this.setFeedItems(event.items);			

			this.feedPresenter.addFooterItems();

			this.focusFirst();

		}

		uiManager.hideNotification();

	}

	else if (event.status != "cancelled") {

		// show error message

		uiManager.showNotification(3000, "warning", "Error loading page!");

	}

	// reset the broker 

	this.feedUpdateBroker = null;

	this.feedUpdateBrokerActive = false;

	// reset commanded feed update flag

	this.feedUpdateForced = false;

}

RssReader.prototype.focusFirst = function(){

	// focus the first feed item control

	// (but only if we are in the main view)

	if (this.feedItemControls.length > 0) {

		this.feedItemControls[0].setFocused(true);

	}

}

// Removes feed items.

RssReader.prototype.removeFeedItems = function (){

	// remove all current feed items from the main view

	for (var i = 0; i < this.feedItemControls.length; i++) {

		this.removeControl(this.feedItemControls[i]);

	}

	// reset feed item control array

	this.feedItemControls = [];

}

// Sets feed items.

RssReader.prototype.addFeedItemControl = function(c){

	this.feedItemControls.push(c);

	this.addControl(c);

}

// Sets feed items.

RssReader.prototype.setFeedItems = function (items){

	// start by removing all current feed items

	this.removeFeedItems();

	if (items.length == 0) {

		this.feedPresenter.showNoItems();

	}

	else {

		// create new feed items and add them to the main view

		// use feed item pool to recycle controls

		for (var i = 0; i < items.length; i++) {

			var item = items[i];

			this.feedPresenter.show(item);

		}

	}

	this.hasData = true;

}

// Update feed

RssReader.prototype.update = function(forceFeedUpdate, notification){

	if ( this.hasData && !forceFeedUpdate ) {

		return;

	}		

	this.feedUpdateForced = forceFeedUpdate;

	if ( notification == undefined ) {

		notification = true;

	}

	// check if a feed update has been scheduled, if it's time to update now,

	// and if there's no update currently in progress and if we're in the main view

	if ((this.feedURL != null) && (!this.feedUpdateBrokerActive) ) { //&& (uiManager.getView() == this) ) {

		// fetch the feed from the specified URL

		this.feedUpdateBrokerActive = true;

		this.feedUpdateBroker = new FeedUpdateBroker();

		this.feedUpdateBroker.startFromItem = this.startFromItem;

		this.feedUpdateBroker.maxItems = this.maxItems;

		if ( this.responseParser != null ) {

			this.feedUpdateBroker.responseParser = this.responseParser;

		}

		this.feedUpdateBroker.ignoreContent = this.ignoreContent;

		this.feedUpdateBroker.fetchFeed(this.feedURL, this);

		// allow cancelling

	    if (window.widget) {

			var self = this;

			menu.setRightSoftkeyLabel("Cancel", function(){

				self.feedUpdateBroker.cancel(); self.setupSoftKeys();

				uiManager.hideNotification();

				});

	    }

		if (notification) {

			uiManager.showNotification(-1, "wait", "Loading...", -1);

		}

	}

}