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

// Symbian Foundation Example Code

//

// This software is in the public domain. No copyright is claimed, and you 

// may use it for any purpose without license from the Symbian Foundation.

// No warranty for any purpose is expressed or implied by the authors or

// the Symbian Foundation. 

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

var updatePageAjax;

var versionURL = "http://developer.symbian.org/wiki/index.php/SEE_2009_Widget";

var downloadUrl = "http://developer.symbian.org/wiki/images/7/74/See09Widget.wgz";

var myVersion = "1.0rc3";

var versionPrefixString = "Current Widget Version is: [";

var versionSuffixString = "]";

function CheckForUpdates() {

	if (IsHSViewMode()) {

		setTimeout(function() {CheckForUpdates();}, 600000);

		return;

	}

	uiManager.showNotification(-1, "wait", "Checking for updates...", -1);

	updatePageAjax = new Ajax();

	updatePageAjax.onreadystatechange = function(){

		CheckForUpdatesStage2();

	};

	updatePageAjax.open('GET', nocache(versionURL), true);

	updatePageAjax.send(null);	

}

function CheckForUpdatesStage2() {

    if (updatePageAjax.readyState == 4) {

		// extract version number

		var content = updatePageAjax.responseText;

		var ind = content.indexOf(versionPrefixString);

		if ( ind == -1 ) {

			uiManager.showNotification(3000, "warning", "Update failed, check manually.");

			return;

		}

		ind += versionPrefixString.length;

		var ind2 = content.indexOf(versionSuffixString,ind);

		if ( ind2 == -1 || (ind2-ind) > 10 ) {

			uiManager.showNotification(3000, "warning", "Update failed, check manually.");

			return;

		}

		var version = content.substring(ind,ind2);

		// compare to this version

		if ( version != myVersion ) {

			var answer = confirm("Install new version " + version + "?");

			if (answer) {

				// ok, we have the update

				uiManager.hideNotification();

				openURL(nocache(downloadUrl));

				setTimeout(function () {window.close();}, 1000);

			} else {

				uiManager.showNotification(3000, "info", "Update cancelled.");

			}

		} else {

			// No need to show anything

			 uiManager.showNotification(3000, "info", "Up to date!");

		}

	}

}