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

// 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. 

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

// The Schedule class is used to load, keep and filter sessions   

function Schedule() {

	this.callBackFunction = null;

	this.sessions = null;

	this.topics = new Array( "Main Stage", "Application Development", "Open Source Business Models", "Device Creation and Contributing to Symbian", "Hands-on Lab 1", "Hands-on Lab 2", "Birds of a Feather" );

	this.scheduleFileName = null;

	this.http = null;

	this.parseCounter = 0;

	this.rawData = null;

}

// Kick off loading

Schedule.prototype.Init = function(csvfile, cbfunc){

	this.callBackFunction = cbfunc;

	this.scheduleFileName = csvfile;

	var self = this;

	setTimeout( function() {self.Load();}, 100);

}

// 'public' functions 

Schedule.prototype.GetTopics = function() {

	return this.topics;

}

Schedule.prototype.GetSessions = function(topic, day) {

	var cnt = this.sessions.length;

	var ret = new Array();

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

		var session = this.sessions[i];

		if ( session.topic == topic && day == session.date ) {

			ret.push(session);

		}

	}

	return ret;

}

Schedule.prototype.GetCurrentSessions = function() {

	var now = GetUtcTime(new Date());

	if ( ! this.sessions || this.sessions == null ) {

		return;

	}

	var cnt = this.sessions.length;

	var ret = new Array();

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

		var session = this.sessions[i];

		var sessionStart = session.GetStartUtc();

		var sessionEnd = session.GetEndUtc();

		if( now > sessionStart && now < sessionEnd ) {

			ret.push(session);

		}

	}

	return ret;

}

// 'private' functions

// Loading and parsing

Schedule.prototype.Load = function(){

	// Prepare asynchronous download

	this.http = new Ajax();

	var self = this;

	this.http.onreadystatechange = function() { self.LoadComplete(); };

	this.http.open("GET", this.scheduleFileName, true); // false means synchronous

	this.http.send(null);

}

Schedule.prototype.LoadComplete = function() {

	// request complete?

    if (this.http.readyState == 4) {

		try {

			this.rawData = this.http.responseText;

			this.http = null; 

			// parse data

			this.sessions = new Array();

			this.Parse(); // Prepare and set the data for the parser.

		} 

		catch (x) {

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

		}

	}

}

Schedule.prototype.Parse = function() {

	var session = new Session();

	var fieldCounter = 0;

	var fieldBuf = "";

	var quoted = false;

	for(; this.parseCounter < this.rawData.length; this.parseCounter++ ) {

		var ch = this.rawData.charAt(this.parseCounter);

		if ( !quoted && ( ch == ',' || ch == '\n') ) {

			session.SetFieldByOrdinal(fieldCounter++, fieldBuf);

			if (fieldCounter == session.GetNumberOfFields()) {

				this.AddSession(session);

				this.parseCounter++;

				var self = this;

				setTimeout(function(){self.Parse();}, 1);

				return;

			}

			fieldBuf = "";

		} else if ( ch == '"' ) {

			if (quoted) {

				if (this.parseCounter < this.rawData.length - 1 && this.rawData.charAt(this.parseCounter + 1) == '"') {

					// escaped quote, ignore this and next

					this.parseCounter++;

				} else {

					quoted = false;

				}

			} else {

				quoted = true;

			}

		} else if ( ch == '\r' ) {

			// ignore carriage return 

		} else if ( ch == '\n' ) { // quoted = true

			// replace newline with <br> 

			fieldBuf += "<br>";

		} else {

			fieldBuf += ch;

		}

	}

	this.Sort();

	if (this.callBackFunction) {

		this.callBackFunction.call();

	}

	uiManager.hideNotification();

}

Schedule.prototype.Sort = function (){

	// we get the schedule all messy so here we sort things out

	var cnt = this.sessions.length;

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

		for( var j = i+1 ; j < cnt ; j++ ) {

			var si = this.sessions[i];

			var sj = this.sessions[j];

			if ( si.startTime > sj.startTime ) {

				// swap

				this.sessions[i] = sj;

				this.sessions[j] = si;

			}

		}	 

	}	 

}

Schedule.prototype.AddSession = function (session) {

	if ( ! session.topic || session.topic == null || session.topic.length == 0 ) {

		return;

	}

	// add to list of sessions

	this.sessions.push(session);

}

function trim(text) {

	return text;

}

function GetUtcTime(d){

	// convert to msec since Jan 1 1970

	var localTime = d.getTime();

	// obtain local UTC offset and convert to msec

	var localOffset = d.getTimezoneOffset() * 60000;

	// obtain UTC time in msec

	return localTime + localOffset;

}