/* ***** BEGIN LICENSE BLOCK *****
 * Version: GPL 3.0
 *
 * The contents of this file are subject to the General Public License
 * 3.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.gnu.org/licenses/gpl.html
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * Author: Michel Verbraak (info@1st-setup.nl)
 * Website: http://www.1st-setup.nl/
 *
 * This interface/service is used for TimeZone conversions to Exchange
 *
 * ***** BEGIN LICENSE BLOCK *****/

var Cc = Components.classes;
var Ci = Components.interfaces;
var Cu = Components.utils;
var Cr = Components.results;
var components = Components;

Cu.import("resource://gre/modules/XPCOMUtils.jsm");
Cu.import("resource://gre/modules/Services.jsm");

Cu.import("resource://calendar/modules/calProviderUtils.jsm");

function mivExchangeTimeZone() {
	this._timeZone = null;
	this._indexDate = null;

	this._standardBias = 0;
	this._daylightBias = 0;

	this.globalFunctions = Cc["@1st-setup.nl/global/functions;1"]
				.getService(Ci.mivFunctions);

	this._names = new Array();
	this._hasDaylight = false;
}

var PREF_MAINPART = 'extensions.1st-setup.exchangecalendar.timezones.';

var mivExchangeTimeZoneGUID = "7621c4ee-d6fb-445a-80f3-4786d2ad5903";

mivExchangeTimeZone.prototype = {

	// methods from nsISupport

	/* void QueryInterface(
	  in nsIIDRef uuid,
	  [iid_is(uuid),retval] out nsQIResult result
	);	 */
	QueryInterface: XPCOMUtils.generateQI([Ci.mivExchangeTimeZone,
			Ci.nsIClassInfo,
			Ci.nsISupports]),

	// Attributes from nsIClassInfo

	classDescription: "Interface for Cal and Exchange TimeZones comparing.",
	classID: components.ID("{"+mivExchangeTimeZoneGUID+"}"),
	contractID: "@1st-setup.nl/exchange/timezone;1",
	flags: Ci.nsIClassInfo.THREADSAFE,
	implementationLanguage: Ci.nsIProgrammingLanguage.JAVASCRIPT,

	// void getInterfaces(out PRUint32 count, [array, size_is(count), retval] out nsIIDPtr array);
	getInterfaces: function _getInterfaces(count) 
	{
		var ifaces = [Ci.mivExchangeTimeZone,
			Ci.nsIClassInfo,
			Ci.nsISupports];
		count.value = ifaces.length;
		return ifaces;
	},

	getHelperForLanguage: function _getHelperForLanguage(language) {
		return null;
	},

	// Internal private.
	dateTimeToStrExchange: function _dateTimeToStrExchange(aDate)
	{
		if (!aDate) return "1900-01-01T00:00:00";

		var result = aDate.year+"-";
		if (aDate.month < 10) result += "0";
		result += aDate.month+"-";
		if (aDate.day < 10) result += "0";
		result += aDate.day+"T";
		if (aDate.hour < 10) result += "0";
		result += aDate.hour+":";
		if (aDate.minute < 10) result += "0";
		result += aDate.minute+":";
		if (aDate.second < 10) result += "0";
		result += aDate.second;

		return result;
	},

	dateTimeToStrCal: function _dateTimeToStrCal(aDate)
	{
		if (!aDate) return "19000101T000000";

		var result = aDate.year;
		if (aDate.month < 10) result += "0";
		result += aDate.month;
		if (aDate.day < 10) result += "0";
		result += aDate.day+"T";
		if (aDate.hour < 10) result += "0";
		result += aDate.hour;
		if (aDate.minute < 10) result += "0";
		result += aDate.minute;
		if (aDate.second < 10) result += "0";
		result += aDate.second;

		return result;
	},

	// External methods

	setExchangeTimezone: function _setExchangeTimezone(aValue, aDate)
	{
		if (aValue == null) {
			this._hasDaylight = false;
			return null;
		}

		if (!aDate) {
			aDate = cal.now();
		}
		var indexDateStr = this.dateTimeToStrExchange(aDate);

		var result = null;

		this._id = aValue.getAttribute("Id", "??");

		this._name = aValue.getAttribute("Name", "??");
		//dump("Exchange timezone:"+this._id+"/"+this._name+"\n");

		//dump("exchangezone:"+aValue+"\n");
		// Se if we have <t:Transitions><t:AbsoluteDateTransition>
		var absoluteDateTransitions = aValue.XPath("/t:Transitions/t:AbsoluteDateTransition");
		var lastDate = "1900-01-01T00:00:00";
		var transitionIndex = 0;
		for each(var absoluteDateTransition in absoluteDateTransitions) {
			var newDate = absoluteDateTransition.getTagValue("t:DateTime", lastDate);
			if ((newDate >= lastDate) && (newDate <= indexDateStr)) {
				lastDate = absoluteDateTransition.getTagValue("t:DateTime", lastDate);
				transitionIndex = absoluteDateTransition.getTagValue("t:To", 0);
			}
		}
		absoluteDateTransitions = null;

		//dump("\nindexDateStr:"+indexDateStr+", lastDate:"+lastDate+", transitionIndex:"+transitionIndex+"\n\n");

		// Now we are going to find the right transition.
		var transitions = aValue.XPath("/t:TransitionsGroups/t:TransitionsGroup[@Id = '"+transitionIndex+"']/*");

		// Get Standard and Daylight transitionId's
		var standardTransition = null;
		var daylightTransition = null;
		for each(var transition in transitions) {
			var tmpId = transition.getTagValue("t:To","");
			if (tmpId.indexOf("-Standard") >= 0) {
				standardTransition = transition;
			}
			else {
				if (tmpId.indexOf("-Daylight") >= 0) {
					daylightTransition = transition;
				}
			}
		}
		transitions = null;

		const dayMap = { Sunday : "SU",
				Saturday : "SA",
				Monday : "MO",
				Tuesday : "TU",
				Wednesday : "WE",
				Thursday: "TH",
				Friday: "FR" };

		this._standardBias = null;
		if (standardTransition) {
			var standardPeriods = aValue.XPath("/t:Periods/t:Period[@Name = 'Standard' and @Id='"+standardTransition.getTagValue("t:To","")+"']");
			if (standardPeriods.length > 0) {
				this._standardBias = this.globalFunctions.convertDurationToSeconds(standardPeriods[0].getAttribute("Bias"));
			}
			standardPeriods = null;

			if (standardTransition.tagName == "RecurringDayTransition") {
				this._standardRRule = "FREQ=YEARLY;BYDAY="+standardTransition.getTagValue("t:Occurrence", 1)+dayMap[standardTransition.getTagValue("t:DayOfWeek", "Sunday")]+";BYMONTH="+standardTransition.getTagValue("t:Month", 3);
			}
			else {
				this._standardRRule = null;
			}
			//dump("this._standardRRule:"+this._standardRRule+"\n");
		}

		this._daylightBias = null;
		if (daylightTransition) {
			var daylightPeriods = aValue.XPath("/t:Periods/t:Period[@Name = 'Daylight' and @Id='"+daylightTransition.getTagValue("t:To","")+"']");
			if (daylightPeriods.length > 0) {
				this._daylightBias = this.globalFunctions.convertDurationToSeconds(daylightPeriods[0].getAttribute("Bias"));
			}
			daylightPeriods = null;

			this._daylightRRule = "FREQ=YEARLY;BYDAY="+daylightTransition.getTagValue("t:Occurrence", 1)+dayMap[daylightTransition.getTagValue("t:DayOfWeek", "Sunday")]+";BYMONTH="+daylightTransition.getTagValue("t:Month", 3);
			//dump("this._daylightRRule:"+this._daylightRRule+"\n");

			this._hasDaylight = true;
		}
		else {
			this._hasDaylight = false;
		}

	},

	setCalTimezone: function _setCalTimezone(aValue, aDate)
	{
		if (aValue == null) {
			this._hasDaylight = false;
			return null;
		}

		if (!aDate) {
			aDate = cal.now();
		}
		var indexDateStr = this.dateTimeToStrCal(aDate);

		this._id = aValue.tzid;

		var tmpNames = aValue.tzid.split("/");

		this._names = new Array();
		for each(var name in tmpNames) {
			this._names.push(name);
		}
//dump(" setCalTimezone: this._names:"+this._names+"\n");

		//calculateBiasOffsets
		var tzcomp = aValue.icalComponent;
		if (!tzcomp) {
			this._hasDaylight = false;
			return;
		}
	
		var standardTimezone = null;
		comp = tzcomp.getFirstSubcomponent("STANDARD");
		while (comp) {
			var daylightStart = comp.getFirstProperty("DTSTART").value;
			if ((daylightStart) && (daylightStart <= indexDateStr)) {
				standardTimezone = comp;
			}
			comp = tzcomp.getNextSubcomponent("STANDARD");
		}

		var daylightTimezone = null;
		var comp = tzcomp.getFirstSubcomponent("DAYLIGHT");
		while (comp) {
			var daylightStart = comp.getFirstProperty("DTSTART").value;
			if ((daylightStart) && (daylightStart <= indexDateStr)) {
				daylightTimezone = comp;
			}
			comp = tzcomp.getNextSubcomponent("DAYLIGHT");
		}

		// Get TZOFFSETTO from standard time.
		if (standardTimezone) {
			var m = standardTimezone.getFirstProperty("TZOFFSETTO").value.match(/^([+-]?)(\d\d)(\d\d)$/);

			this._standardBias = (m[2] * 3600) + (m[3]*60);

			if (m[1] == '+') {
				this._standardBias = -1 * this._standardBias;
			}

			if (standardTimezone.getFirstProperty("RRULE")) {
				this._standardRRule = standardTimezone.getFirstProperty("RRULE").value;
			}
			else {
				this._standardRRule = null;
			}
			//dump("this._standardRRule:"+this._standardRRule+"\n");
		}

		if (daylightTimezone) {
			var m = daylightTimezone.getFirstProperty("TZOFFSETTO").value.match(/^([+-]?)(\d\d)(\d\d)$/);

			this._daylightBias = (m[2] * 3600) + (m[3]*60);

			if (m[1] == '+') {
				this._daylightBias = -1 * this._daylightBias;
			}

			if (daylightTimezone.getFirstProperty("RRULE")) {
				this._daylightRRule = daylightTimezone.getFirstProperty("RRULE").value;
			}
			else {
				this._daylightRRule = null;
			}
			//dump("this._daylightRRule:"+this._daylightRRule+"\n");

			this._hasDaylight = true;
		}
		else {
			this._hasDaylight = false;
		}
	
	},

	equal: function _equal(aTimeZone)
	{
		if (this.standardBias != aTimeZone.standardBias) { // Standard bias does not match
			//dump("  -- Standard Bias values do not match. "+this.standardBias+" != "+aTimeZone.standardBias+"\n");
			return false;
		}

		if (this.hasDaylight != aTimeZone.hasDaylight) { // daylight does not match.
			//dump("  -- One has daylight other not.\n");
			return false;
		}

		if ((this.hasDaylight) && (this.daylightBias != aTimeZone.daylightBias)) { // daylight bias does not match.
			//dump("  -- Daylight Bias values do not match. "+this.daylightBias+" != "+aTimeZone.daylightBias+"\n");
			return false;
		}
	
		if (this.standardRRule != aTimeZone.standardRRule) {
			//dump("  -- standard RRUle values do not match. "+this.standardRRule+" != "+aTimeZone.standardRRule+"\n");
			return false;
		}

		if ((this.hasDaylight) && (this.daylightRRule != aTimeZone.daylightRRule)) {
			//dump("  -- Daylight RRUle values do not match. "+this.daylightRRule+" != "+aTimeZone.daylightRRule+"\n");
			return false;
		}

		return true;
	},

	get hasDaylight()
	{
		return this._hasDaylight;
	},

	get standardRRule()
	{
		return this._standardRRule;
	},

	get daylightRRule()
	{
		return this._daylightRRule;
	},

	get id()
	{
		return this._id;
	},

	get name()
	{
		return this._name;
	},

	getNames: function _getNames(aCount)
	{
		aCount.value = this._names.length;
		return this._names;
	},

	get standardBias()
	{
		return this._standardBias;
	},

	get daylightBias()
	{
		return this._daylightBias;
	},

	get timeZone()
	{
		return this._timeZone;
	},

	set timeZone(aValue)
	{
		this._timeZone = aValue;
		if (aValue["getAttribute"]) {
		//if (aValue instanceof Ci.mivIxml2jxon) {
			this.setExchangeTimezone(aValue, this._indexDate);
		}
		if (aValue instanceof Ci.calITimezone) {
			this.setCalTimezone(aValue, this._indexDate);
		}
	},

	get indexDate()
	{
		return this._indexDate;
	},

	set indexDate(aValue)
	{
		this._indexDate = aValue;
		if (this._timeZone) this.timeZone = this._timeZone;
	},
}

function NSGetFactory(cid) {

	try {
		if (!NSGetFactory.mivExchangeTimeZone) {
			// Load main script from lightning that we need.
			NSGetFactory.mivExchangeTimeZone = XPCOMUtils.generateNSGetFactory([mivExchangeTimeZone]);
			
	}

	} catch(e) {
		Components.utils.reportError(e);
		dump(e);
		throw e;
	}
	return NSGetFactory.mivExchangeTimeZone(cid);
} 

