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

// 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 currentFontSize = 14;

var uiManager;

var home;

var mainView;

var osconIcalUrl = new Array();

var icalData = new Array();

var icalReader = new Array();

var osconDays = new Array();

var http;

var downloadDayIndex = -1;

// Called from the onload event handler to initialize the widget.

function init() {

	for (var i = 0; i < 5; i++) {

		var osconDay = new Date()

		osconDay.setFullYear(2009, 6, 20 + i);

		osconDays.push(osconDay);

		osconIcalUrl.push("OSCON200907" + (20+i) + ".ics");

		icalData.push(null);

		icalReader.push(null);

	}

    // set tab-navigation mode and show softkeys

    // (only if we are in the WRT environment)

    if (window.widget) {

		//create about menu

        widget.setNavigationEnabled(false);

        menu.showSoftkeys();

    }

	// create UI manager

	uiManager = new UIManager();

	home = new ListView(null,null);

	var homeViewImage = new ImageLabel(null, null, "oscon-home.png");

	// hack to center image

	homeViewImage.contentElement.style.textAlign = "center";

	home.addControl(homeViewImage);

	var homeViewImage2 = new ImageLabel(null, null, "logo.png");

	// hack to center image

	homeViewImage2.contentElement.style.textAlign = "center";

	home.addControl(homeViewImage2);

	mainView = new ListView(null, "<img src=oscon-home.png>");

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

		var button = new NavigationButton(i, "day"+(i+1)+".png", dateToString(osconDays[i]));

		mainView.addControl(button);

		button.addEventListener("ActionPerformed", function(event){

			var clickedButton = event.source;

			var clickedId = clickedButton.id;

			showDay(clickedId, osconDays[clickedId], null);

			});

	}	

	home.previousView=mainView;

	home.show();

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

	setTimeout(function(){	uiManager.hideNotification();mainView.show();}, 1000);

}

function showDay(dayIndex, date) {

	downloadDayIndex = dayIndex;

	if ( icalReader[dayIndex] == null ) {

		downloadIcalData(dayIndex);

	} else {

		showList(date, null);

	}

}

function downloadIcalData(dayIndex) {

	downloadDayIndex = dayIndex;

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

	http = new Ajax();

    http.onreadystatechange = function() { downloadStateChanged(); };

    // initiate the request

    http.open("GET", osconIcalUrl[downloadDayIndex], true);

    http.send(null);

}

function downloadStateChanged(){

	// complete request?

    if (http.readyState == 4) {

        // attempt to get response status

        var responseStatus = null;

        try {

            responseStatus = http.status;

        } catch (noStatusException) {}

		// are we being prompted for login?

		icalData[downloadDayIndex] = http.responseText;

		try {

			dataAvailable(downloadDayIndex);

//			savePreferences();

		}catch(x) {

			uiManager.showNotification(5000, "warning", "Error processing feed");

		}

		downloadInProgress = false;

    }

}

function dataAvailable(downloadDayIndex){

	uiManager.showNotification(-1, "wait", "Parsing info...", -1);

	// parse iCal

	var reader = new iCalReader(); // Construction of the reader object.

	reader.prepareData(icalData[downloadDayIndex]); // Prepare and set the data for the parser.

	reader.parse(); // Parse the data.

	reader.sort(); // Sort the data.

	icalReader[downloadDayIndex] =  reader;

	showList(osconDays[downloadDayIndex], null);

	uiManager.hideNotification();

}

function showList(day, session) {

	var list = new ListView(null, "<img src=oscon-home.png>");

	if (day) {

		var button = new ImageLabel(null, dateToString(day), "day"+(downloadDayIndex+1)+".png");

		list.addControl(button);

	}

	if (session) {

		var button = new ImageLabel(null, sessionTimeToString(session) + ", " + dateToString(session) , "session.png");

		list.addControl(button);

	}

	var myCalReader = icalReader[downloadDayIndex];

	var events = myCalReader.getCalendar().getEvents(); // Get all events.

	var num = myCalReader.getCalendar().getNrOfEvents();

	var addedSessions = new Array();

	for(var i=0; i<num; i++) { // Loop through all events.

		var event = myCalReader.getCalendar().getEventAtIndex(i); // A single event.        

		// Get Javascript date for start and end time.

		var startDate = event.getStartDate();

		var altStartDate = null;

		try {

			altStartDate = event.getAltStartDate();

		} catch(z) {

			altStartDate = startDate; 

		}

		var timeZone = event.getTimeZone();

		if ( day ) {

			if ( ! dayMatches(day, startDate) ) {

				continue;

			} else {

				var haveit = false;

				// if session is not in already, add it

				for (var j = 0 ; j < addedSessions.length ; j++ ) {

					if ( sessionMatches(addedSessions[j], altStartDate ) ) {

						haveit = true;

						break;

					}

				}

				if (!haveit) {

					// add it

					addedSessions.push(altStartDate);

					var button = new NavigationButton(altStartDate.getTime(), "session.png", "Session @ "+ sessionTimeToString(altStartDate));

					button.addEventListener("ActionPerformed", function(event){

						var clickedButton = event.source;

						var clickedId = clickedButton.id;

						var ed = new Date();

						ed.setTime(clickedId);

						showList(null, ed);

					});

					list.addControl(button);

				}

				continue;

			}

		}

		else if ( ! sessionMatches(session, startDate) ) {

			continue;

		}

		// add events

		var endDate = event.getEndDate();

		var location = event.getProperty("LOCATION");

		var summary = event.getProperty("SUMMARY");

		var description = event.getProperty("DESCRIPTION");

		var url = event.getProperty("URL");

		var buf = "";

		buf += "<div class=\"FeedItemDate\">" ;

		if ( location != null ) {

			buf += location + ", ";

		}

		buf += sessionTimeToString(startDate) +"-" + sessionTimeToString(endDate) + " " + timeZone + "</div>";

		buf += "<div class=\"FeedItemDescription\">" + description + "</div>";

		if (url != null) {

	        buf += "<div class=\"FeedItemLink\">";

            buf += "<a href=\"JavaScript:void(0)\" onclick=\"openURL('" + url + "'); return false;\">";

            buf += "Read more...";

            buf += "</a>";

	        buf += "</div>";

		}

		var cp = new ContentPanel(null, null, null, true);

		// initialize feed item control

		cp.setCaption(summary);

		cp.setContent(buf);

		cp.setExpanded(false);

		list.addControl(cp); 	

	} // End for each event.

	list.previousView = uiManager.currentView;

	list.show();

}

// Loads widget preferences.

function loadPreferences() {

    if (window.widget) {

        // load settings from widget preferences store

        icalData = widget.preferenceForKey("icalData");

    }

}

// Loads widget preferences.

function savePreferences() {

    if (window.widget) {

        // save settings in widget preferences store

        widget.setPreferenceForKey(icalData, "icalData");

    }

}

function setDefaultFontSizeForScreenSize(){

	// first check if there is a preference present

    if (window.widget) {

		var saved = widget.preferenceForKey("fontsize");

		if ( widget.preferenceForKey("fontsize") ) {

			setCssBodyFontSize(parseInt(saved));

		}

		else {

			// no preference available, check screen size

			if (window.screen.width > 400 || window.screen.height > 400) {

				// hi res screen, use large font

				setCssBodyFontSize(18);

			}

			else {

				// lo res screen, use small font

				setCssBodyFontSize(14);

			}

		}

	}

}

function increaseFontSize(){

    if (window.widget) {

		setCssBodyFontSize(currentFontSize + 2);

	}

}

function decreaseFontSize(){

    if (window.widget) {

		if (currentFontSize > 4) {

			setCssBodyFontSize(currentFontSize - 2);

		}

	}

}

function setCssBodyFontSize(size) {

    if (window.widget) {

		currentFontSize = size;

		var sizestring = "" + size;

		document.body.style.fontSize = sizestring + "px";

		widget.setPreferenceForKey(sizestring, "fontsize");

	}

}

function nocache(url) {

    if (url.indexOf("?") == -1) {

        url += "?";

    } else {

        url += "&";

    }

    url += "nocache=" + (new Date().getTime());

	return url;

}

function sessionMatches(session, startDate) {

	var m_date = session.getDate()==startDate.getDate();

	var m_year = session.getFullYear()==startDate.getFullYear();

	var m_month = session.getMonth()==startDate.getMonth();

	var m_hour = session.getHours()==startDate.getHours();

	var m_minute = session.getMinutes()==startDate.getMinutes();

	return m_date && m_month && m_year && m_hour && m_minute; 

}

function dayToString(day) {

	return day.toDateString(); 	

}

function dayMatches(day, startDate){

	var m_date = day.getDate()==startDate.getDate();

	var m_year = day.getFullYear()==startDate.getFullYear();

	var m_month = day.getMonth()==startDate.getMonth();

	return m_date && m_month && m_year; 

}

function sessionTimeToString(session) {

	return ""+session.getHours()+":"+pad(session.getMinutes(),2); 	

}

function dateToString(day) {

	var full = day.toDateString();

	// remove year as it doesn't fit on small screens

	return full.substring(0, full.length-4); 	

}

function pad(num, digits) {

	var str = "" + num;

	while ( str.length < digits ) {

		str = "0" + str;

	}

	return str;

}

// Opens a URL in a separate browser window

function openURL(url) {

    if (window.widget) {

        // in WRT

        widget.openURL(url);

    } else {

        // outside WRT

        window.open(url, "NewWindow");

    }

}