/*
 * Date Format 1.2.2
 * (c) 2007-2008 Steven Levithan <stevenlevithan.com>
 * MIT license
 * Includes enhancements by Scott Trenda <scott.trenda.net> and Kris Kowal <cixar.com/~kris.kowal/>
 *
 * Accepts a date, a mask, or a date and a mask.
 * Returns a formatted version of the given date.
 * The date defaults to the current date/time.
 * The mask defaults to dateFormat.masks.default.
 */
var dateFormat = function () {
	var	token = /d{1,4}|m{1,4}|yy(?:yy)?|([HhMsTt])\1?|[LloSZ]|"[^"]*"|'[^']*'/g,
		timezone = /\b(?:[PMCEA][SDP]T|(?:Pacific|Mountain|Central|Eastern|Atlantic) (?:Standard|Daylight|Prevailing) Time|(?:GMT|UTC)(?:[-+]\d{4})?)\b/g,
		timezoneClip = /[^-+\dA-Z]/g,
		pad = function (val, len) {
			val = String(val);
			len = len || 2;
			while (val.length < len) val = "0" + val;
			return val;
		};

	// Regexes and supporting functions are cached through closure
	return function (date, mask, utc) {
		var dF = dateFormat;

		// You can't provide utc if you skip other args (use the "UTC:" mask prefix)
		if (arguments.length == 1 && (typeof date == "string" || date instanceof String) && !/\d/.test(date)) {
			mask = date;
			date = undefined;
		}

		// Passing date through Date applies Date.parse, if necessary
		date = date ? new Date(date) : new Date();
		if (isNaN(date)) throw new SyntaxError("invalid date");

		mask = String(dF.masks[mask] || mask || dF.masks["default"]);

		// Allow setting the utc argument via the mask
		if (mask.slice(0, 4) == "UTC:") {
			mask = mask.slice(4);
			utc = true;
		}

		var	_ = utc ? "getUTC" : "get",
			d = date[_ + "Date"](),
			D = date[_ + "Day"](),
			m = date[_ + "Month"](),
			y = date[_ + "FullYear"](),
			H = date[_ + "Hours"](),
			M = date[_ + "Minutes"](),
			s = date[_ + "Seconds"](),
			L = date[_ + "Milliseconds"](),
			o = utc ? 0 : date.getTimezoneOffset(),
			flags = {
				d:    d,
				dd:   pad(d),
				ddd:  dF.i18n.dayNames[D],
				dddd: dF.i18n.dayNames[D + 7],
				m:    m + 1,
				mm:   pad(m + 1),
				mmm:  dF.i18n.monthNames[m],
				mmmm: dF.i18n.monthNames[m + 12],
				yy:   String(y).slice(2),
				yyyy: y,
				h:    H % 12 || 12,
				hh:   pad(H % 12 || 12),
				H:    H,
				HH:   pad(H),
				M:    M,
				MM:   pad(M),
				s:    s,
				ss:   pad(s),
				l:    pad(L, 3),
				L:    pad(L > 99 ? Math.round(L / 10) : L),
				t:    H < 12 ? "a"  : "p",
				tt:   H < 12 ? "am" : "pm",
				T:    H < 12 ? "A"  : "P",
				TT:   H < 12 ? "AM" : "PM",
				Z:    utc ? "UTC" : (String(date).match(timezone) || [""]).pop().replace(timezoneClip, ""),
				o:    (o > 0 ? "-" : "+") + pad(Math.floor(Math.abs(o) / 60) * 100 + Math.abs(o) % 60, 4),
				S:    ["th", "st", "nd", "rd"][d % 10 > 3 ? 0 : (d % 100 - d % 10 != 10) * d % 10]
			};

		return mask.replace(token, function ($0) {
			return $0 in flags ? flags[$0] : $0.slice(1, $0.length - 1);
		});
	};
}();

// Some common format strings
dateFormat.masks = {
	"default":      "ddd mmm dd yyyy HH:MM:ss",
	shortDate:      "m/d/yy",
	mediumDate:     "mmm d, yyyy",
	longDate:       "mmmm d, yyyy",
	fullDate:       "dddd, mmmm d, yyyy",
	shortTime:      "h:MM TT",
	mediumTime:     "h:MM:ss TT",
	longTime:       "h:MM:ss TT Z",
	isoDate:        "yyyy-mm-dd",
	isoTime:        "HH:MM:ss",
	isoDateTime:    "yyyy-mm-dd'T'HH:MM:ss",
	isoUtcDateTime: "UTC:yyyy-mm-dd'T'HH:MM:ss'Z'"
};

// Internationalization strings
dateFormat.i18n = {
	dayNames: [
		"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat",
		"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
	],
	monthNames: [
		"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
		"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"
	]
};

// For convenience...
Date.prototype.format = function (mask, utc) {
	return dateFormat(this, mask, utc);
};


(function($){
	
	function daysInMonth(year, month){
		return 32 - new Date(year, month, 32).getDate();
	}
	
	function dayRange(from, to) {

	    // The number of milliseconds in one day
	    var ONE_DAY = 1000 * 60 * 60 * 24
	
	    // Convert both dates to milliseconds
	    var from_ms = from.getTime()
	    var to_ms = to.getTime()
	
	    // Calculate the difference in milliseconds
	    var difference_ms = Math.abs(from_ms - to_ms)
	    
	    // Convert back to days and return
	    return Math.round(difference_ms/ONE_DAY)
	
	}
	
	$.strPad = function(i,l,s) {
		var o = i.toString();
		if (!s) { s = '0'; }
		while (o.length < l) {
			o = s + o;
		}
		return o;
	};

	
	$.fn.selectOption = function(val){
		return $(this).each(function(){
			$(this).find('option').attr('selected','');
			$(this).find('option[value="'+val+'"]').attr('selected','selected');
		});
	}
	
	$.fn.getDate = function(){
		var date = new Date();
		$(this).each(function(){
			if($(this).is('input')){
				var value = $(this).val().split('-');
				date = new Date(
					parseInt(value[0]),
					(parseInt(value[1])-1),
					parseInt(value[2])
				);
			}
		});
		return date;
	}
	
	var minYear = $('fieldset.arrival select.year option:first').val();
	var maxYear = $('fieldset.arrival select.year option:last').val();
	var defaultArrivalDate = $('fieldset.arrival input.datepicker').getDate();
	var defaultDepartureDate = $('fieldset.departure input.datepicker').getDate();
	
	var defaultPeriod = dayRange(defaultArrivalDate,defaultDepartureDate);
	
	var defaultYears = $('select.year:first option').clone();
	
	
	
	$.fn.setDay = function(selectedDay){
		var selectedDay = (selectedDay == undefined)?-1:selectedDay;
		return $(this).each(function(){
			var year = parseInt($(this).parents('fieldset:first').find('select.year').val());
			var month = parseInt($(this).parents('fieldset:first').find('select.month').val());
			var curdate = new Date();
			
			if(selectedDay < 0){
				selectedDay = parseInt($(this).parents('fieldset:first').find('select.day').val());
			}
			
			var datepicker = $(this).parents('fieldset:first').find('input.datepicker');
			var elm = $(this).parents('fieldset:first').find('select.day');
			
			var start = 1;
			var days = daysInMonth(year, month-1);
			
			if($(this).parent().hasClass('arrival')){
				if(new Date(year,month-1,1).format('yyyymm') == curdate.format('yyyymm')){
					start = curdate.getDate();
				}
			}else{
				curdate =  $('fieldset.arrival input.datepicker').getDate();
				if(new Date(year,month-1,1).format('yyyymm') == curdate.format('yyyymm')){
					curdate.setDate(curdate.getDate() + 1);
					start = curdate.getDate();
				}
			}
			elm.html('');
			
			for(var I=start;I<=days;I++){
				elm.append('<option value="'+I+'"'+((I==selectedDay)?' selected="selected"':'')+'>'+$.strPad(I,2)+'</option>');
			}
		});
	}
	
	$.fn.setMonth = function(selectedMonth){
		var selectedMonth = (selectedMonth == undefined)?-1:selectedMonth;
		return $(this).each(function(){
			var year = $(this).parents('fieldset:first').find('select.year').val();
			var startMonth = 1;
			var curdate = new Date();
			var month = $(this).parents('fieldset:first').find('select.month');
			
			if (selectedMonth < 0) {
				selectedMonth = $(this).parents('fieldset:first').find('select.month').val();
			}
			
			if ($(this).parent().hasClass('arrival')) {
				if(year == curdate.getFullYear()){
					startMonth = (curdate.getMonth() + 1);
				}
			}else{
				curdate =  $('fieldset.arrival input.datepicker').getDate();
				if(year == curdate.getFullYear()){
					curdate.setDate(curdate.getDate()+1);
					startMonth = (curdate.getMonth()+1);	
				}
			}
			
			month.html('');
			for(var I = startMonth;I<=12;I++){
				month.append('<option value="'+I+'"'+((I==selectedMonth)?' selected="selected"':'')+'>'+$.strPad(I,2)+'</option>');
			}
		});
	}
	
	$.fn.setYear = function(selectedYear){
		var selectedYear = (selectedYear == undefined)?-1:selectedYear;
		return $(this).each(function(){
			var curdate = new Date();
			
			if (selectedYear < 0) {
				selectedYear = $(this).parents('fieldset:first').find('select.year').val();
			}
			
			if($(this).parent().hasClass('departure')){
				curdate =  $('fieldset.arrival input.datepicker').getDate();
				curdate.setDate(curdate.getDate() + 1);
			}
			
			var start = curdate.getFullYear();
			var stop = maxYear;
			
			$(this).html('');
			for(var I = start;I<=stop;I++){
				$(this).append('<option value="'+I+'"'+((I==selectedYear)?' selected="selected"':'')+'>'+I+'</option>');
			}
		});
	}
	
	function updateDatepicker(){
		var year = parseInt($(this).parents('fieldset:first').find('select.year').val());
		var month = parseInt($(this).parents('fieldset:first').find('select.month').val());
		var day = parseInt($(this).parents('fieldset:first').find('select.day').val());
		var datepicker = $(this).parents('fieldset:first').find('input.datepicker');
		
		datepicker.val(year+'-'+month+'-'+day);
		datepicker.trigger('change');
	}
	
	function updateDeparture(){
		var date = $(this).parents('fieldset:first').find('input.datepicker').val().split('-');
		var day = parseInt(date[2])+1;
		var objDate = new Date(date[0],date[1]-1,day);
		
		$('fieldset.departure select.year').setYear();
		$('fieldset.departure select.month').setMonth();
		$('fieldset.departure select.day').setDay();
		$('fieldset.departure input.datepicker').datepicker('option', 'minDate', objDate);
	}

	$('select.month').change(function(){
		$(this).parents('fieldset:first').find('select.day').setDay();
	});
	
	$('select.year').change(function(){
		$(this).parents('fieldset:first').find('select.month').setMonth();
	});
	$('select').change(updateDatepicker);
	$('fieldset.arrival input.datepicker').change(updateDeparture);
	
	$('.datepicker').change(function(){
			var date = $(this).val().split('-');
			$(this).parents('fieldset').find('select.year').setYear(date[0]);
			$(this).parents('fieldset').find('select.month').setMonth(date[1]);
			$(this).parents('fieldset').find('select.day').setDay(date[2]);
	});
	
	$('.datepicker').datepicker({
		buttonText:'Klikk for å velge dato',
		firstDay:1,
		dateFormat: 'yy-m-d',
		monthNames: ['Januar','Februar','Marts','April','Maj','Juni','Juli','August','September','Oktober','November','December'],
		monthNamesShort: ['Jan','Feb','Mar','Apr','Maj','Jun','Jul','Aug','Sep','Okt','Nov','Dec'],
		dayNames: ['Søndag', 'Mandag', 'Tirsdag', 'Onsdag', 'Torsdag', 'Fredag', 'Lørdag'],
		dayNamesShort: ['Søn', 'Man', 'Tir', 'Ons', 'Tor', 'Fre', 'Lør'],
		dayNamesMin: ['Sø', 'Ma', 'Ti', 'On', 'To', 'Fr', 'Lø'],
		showOn: 'button', 
		buttonImage: 'elm/datepicker.gif', 
		buttonImageOnly: true,
		gotoCurrent:true
	});
	
	var arrivalStart = new Date();
	var arrivalStop = new Date(maxYear,11,30);
	
	var departureStart = new Date();
		departureStart.setDate(departureStart.getDate()+1);
	var departureStop = new Date(maxYear,11,31);
	
	$('fieldset.arrival input.datepicker').datepicker('option', 'minDate', arrivalStart);
	$('fieldset.departure input.datepicker').datepicker('option', 'minDate', departureStart);
	
	$('fieldset.arrival input.datepicker').datepicker('option', 'maxDate', arrivalStop);
	$('fieldset.departure input.datepicker').datepicker('option', 'maxDate', new Date(maxYear,11,31));
	
})(jQuery);