

(function( $ ) {

	function UTCDate(){
		return new Date(Date.UTC.apply(Date, arguments));
	}
	function UTCToday(){
		var today = new Date();
		return UTCDate(today.getUTCFullYear(), today.getUTCMonth(), today.getUTCDate());
	}

	// Picker object

	var Datepicker = function(element, options) {
		var that = this;

		this._process_options(options);

		this.element = $(element);
		this.isInline = false;
		this.isInput = this.element.is('input');
		this.component = this.element.is('.date') ? this.element.find('.add-on, .btn, .input-group-addon') : false;
		this.hasInput = this.component && this.element.find('input').length;
		if(this.component && this.component.length === 0)
			this.component = false;

		this.picker = $(DPGlobal.template);
		this._buildEvents();
		this._attachEvents();

		if(this.isInline) {
			this.picker.addClass('datepicker-inline').appendTo(this.element);
		} else {
			this.picker.addClass('datepicker-dropdown dropdown-menu');
		}

		if (this.o.rtl){
			this.picker.addClass('datepicker-rtl');
			this.picker.find('.prev i, .next i')
						.toggleClass('glyphicon glyphicon-arrow-left glyphicon-arrow-right');
		}


		this.viewMode = this.o.startView;

		if (this.o.calendarWeeks)
			this.picker.find('tfoot th.today')
						.attr('colspan', function(i, val){
							return parseInt(val) + 1;
						});

		this._allow_update = false;

		this.setStartDate(this.o.startDate);
		this.setEndDate(this.o.endDate);
		this.setDaysOfWeekDisabled(this.o.daysOfWeekDisabled);

		this.fillDow();
		this.fillMonths();

		this._allow_update = true;

		this.update();
		this.showMode();

		if(this.isInline) {
			this.show();
		}
	};

	Datepicker.prototype = {
		constructor: Datepicker,

		_process_options: function(opts){
			// Store raw options for reference
			this._o = $.extend({}, this._o, opts);
			// Processed options
			var o = this.o = $.extend({}, this._o);

			// Check if "de-DE" style date is available, if not language should
			// fallback to 2 letter code eg "de"
			var lang = o.language;
			if (!dates[lang]) {
				lang = lang.split('-')[0];
				if (!dates[lang])
					lang = defaults.language;
			}
			o.language = lang;

			switch(o.startView){
				case 2:
				case 'decade':
					o.startView = 2;
					break;
				case 1:
				case 'year':
					o.startView = 1;
					break;
				default:
					o.startView = 0;
			}

			switch (o.minViewMode) {
				case 1:
				case 'months':
					o.minViewMode = 1;
					break;
				case 2:
				case 'years':
					o.minViewMode = 2;
					break;
				default:
					o.minViewMode = 0;
			}

			o.startView = Math.max(o.startView, o.minViewMode);

			o.weekStart %= 7;
			o.weekEnd = ((o.weekStart + 6) % 7);

			var format = DPGlobal.parseFormat(o.format)
			if (o.startDate !== -Infinity) {
				o.startDate = DPGlobal.parseDate(o.startDate, format, o.language);
			}
			if (o.endDate !== Infinity) {
				o.endDate = DPGlobal.parseDate(o.endDate, format, o.language);
			}

			o.daysOfWeekDisabled = o.daysOfWeekDisabled||[];
			if (!$.isArray(o.daysOfWeekDisabled))
				o.daysOfWeekDisabled = o.daysOfWeekDisabled.split(/[,\s]*/);
			o.daysOfWeekDisabled = $.map(o.daysOfWeekDisabled, function (d) {
				return parseInt(d, 10);
			});
		},
		_events: [],
		_secondaryEvents: [],
		_applyEvents: function(evs){
			for (var i=0, el, ev; i<evs.length; i++){
				el = evs[i][0];
				ev = evs[i][1];
				el.on(ev);
			}
		},
		_unapplyEvents: function(evs){
			for (var i=0, el, ev; i<evs.length; i++){
				el = evs[i][0];
				ev = evs[i][1];
				el.off(ev);
			}
		},
		_buildEvents: function(){
			if (this.isInput) { // single input
				this._events = [
					[this.element, {
						focus: $.proxy(this.show, this),
						keyup: $.proxy(this.update, this),
						keydown: $.proxy(this.keydown, this)
					}]
				];
			}
			else if (this.component && this.hasInput){ // component: input + button
				this._events = [
					// For components that are not readonly, allow keyboard nav
					[this.element.find('input'), {
						focus: $.proxy(this.show, this),
						keyup: $.proxy(this.update, this),
						keydown: $.proxy(this.keydown, this)
					}],
					[this.component, {
						click: $.proxy(this.show, this)
					}]
				];
			}
			else if (this.element.is('div')) {  // inline datepicker
				this.isInline = true;
			}
			else {
				this._events = [
					[this.element, {
						click: $.proxy(this.show, this)
					}]
				];
			}

			this._secondaryEvents = [
				[this.picker, {
					click: $.proxy(this.click, this)
				}],
				[$(window), {
					resize: $.proxy(this.place, this)
				}],
				[$(document), {
					mousedown: $.proxy(function (e) {
						// Clicked outside the datepicker, hide it
						if (!(
							this.element.is(e.target) ||
							this.element.find(e.target).size() ||
							this.picker.is(e.target) ||
							this.picker.find(e.target).size()
						)) {
							this.hide();
						}
					}, this)
				}]
			];
		},
		_attachEvents: function(){
			this._detachEvents();
			this._applyEvents(this._events);
		},
		_detachEvents: function(){
			this._unapplyEvents(this._events);
		},
		_attachSecondaryEvents: function(){
			this._detachSecondaryEvents();
			this._applyEvents(this._secondaryEvents);
		},
		_detachSecondaryEvents: function(){
			this._unapplyEvents(this._secondaryEvents);
		},
		_trigger: function(event, altdate){
			var date = altdate || this.date,
				local_date = new Date(date.getTime() + (date.getTimezoneOffset()*60000));

			this.element.trigger({
				type: event,
				date: local_date,
				format: $.proxy(function(altformat){
					var format = altformat || this.o.format;
					return DPGlobal.formatDate(date, format, this.o.language);
				}, this)
			});
		},

		show: function(e) {
			if (!this.isInline)
				this.picker.appendTo('body');
			this.picker.show();
			this.height = this.component ? this.component.outerHeight() : this.element.outerHeight();
			this.place();
			this._attachSecondaryEvents();
			if (e) {
				e.preventDefault();
			}
			this._trigger('show');
		},

		hide: function(e){
			if(this.isInline) return;
			if (!this.picker.is(':visible')) return;
			this.picker.hide().detach();
			this._detachSecondaryEvents();
			this.viewMode = this.o.startView;
			this.showMode();

			if (
				this.o.forceParse &&
				(
					this.isInput && this.element.val() ||
					this.hasInput && this.element.find('input').val()
				)
			)
				this.setValue();
			this._trigger('hide');
		},

		remove: function() {
			this.hide();
			this._detachEvents();
			this._detachSecondaryEvents();
			this.picker.remove();
			delete this.element.data().datepicker;
			if (!this.isInput) {
				delete this.element.data().date;
			}
		},

		getDate: function() {
			var d = this.getUTCDate();
			return new Date(d.getTime() + (d.getTimezoneOffset()*60000));
		},

		getUTCDate: function() {
			return this.date;
		},

		setDate: function(d) {
			this.setUTCDate(new Date(d.getTime() - (d.getTimezoneOffset()*60000)));
		},

		setUTCDate: function(d) {
			this.date = d;
			this.setValue();
		},

		setValue: function() {
			var formatted = this.getFormattedDate();
			if (!this.isInput) {
				if (this.component){
					this.element.find('input').val(formatted);
				}
			} else {
				this.element.val(formatted);
			}
		},

		getFormattedDate: function(format) {
			if (format === undefined)
				format = this.o.format;
			return DPGlobal.formatDate(this.date, format, this.o.language);
		},

		setStartDate: function(startDate){
			this._process_options({startDate: startDate});
			this.update();
			this.updateNavArrows();
		},

		setEndDate: function(endDate){
			this._process_options({endDate: endDate});
			this.update();
			this.updateNavArrows();
		},

		setDaysOfWeekDisabled: function(daysOfWeekDisabled){
			this._process_options({daysOfWeekDisabled: daysOfWeekDisabled});
			this.update();
			this.updateNavArrows();
		},

		place: function(){
						if(this.isInline) return;
			var zIndex = parseInt(this.element.parents().filter(function() {
							return $(this).css('z-index') != 'auto';
						}).first().css('z-index'))+10;
			var offset = this.component ? this.component.parent().offset() : this.element.offset();
			var height = this.component ? this.component.outerHeight(true) : this.element.outerHeight(true);
			this.picker.css({
				top: offset.top + height,
				left: offset.left,
				zIndex: zIndex
			});
		},

		_allow_update: true,
		update: function(){
			if (!this._allow_update) return;

			var date, fromArgs = false;
			if(arguments && arguments.length && (typeof arguments[0] === 'string' || arguments[0] instanceof Date)) {
				date = arguments[0];
				fromArgs = true;
			} else {
				date = this.isInput ? this.element.val() : this.element.data('date') || this.element.find('input').val();
				delete this.element.data().date;
			}

			this.date = DPGlobal.parseDate(date, this.o.format, this.o.language);

			if(fromArgs) this.setValue();

			if (this.date < this.o.startDate) {
				this.viewDate = new Date(this.o.startDate);
			} else if (this.date > this.o.endDate) {
				this.viewDate = new Date(this.o.endDate);
			} else {
				this.viewDate = new Date(this.date);
			}
			this.fill();
		},

		fillDow: function(){
			var dowCnt = this.o.weekStart,
			html = '<tr>';
			if(this.o.calendarWeeks){
				var cell = '<th class="cw">&nbsp;</th>';
				html += cell;
				this.picker.find('.datepicker-days thead tr:first-child').prepend(cell);
			}
			while (dowCnt < this.o.weekStart + 7) {
				html += '<th class="dow">'+dates[this.o.language].daysMin[(dowCnt++)%7]+'</th>';
			}
			html += '</tr>';
			this.picker.find('.datepicker-days thead').append(html);
		},

		fillMonths: function(){
			var html = '',
			i = 0;
			while (i < 12) {
				html += '<span class="month">'+dates[this.o.language].monthsShort[i++]+'</span>';
			}
			this.picker.find('.datepicker-months td').html(html);
		},

		setRange: function(range){
			if (!range || !range.length)
				delete this.range;
			else
				this.range = $.map(range, function(d){ return d.valueOf(); });
			this.fill();
		},

		getClassNames: function(date){
			var cls = [],
				year = this.viewDate.getUTCFullYear(),
				month = this.viewDate.getUTCMonth(),
				currentDate = this.date.valueOf(),
				today = new Date();
			if (date.getUTCFullYear() < year || (date.getUTCFullYear() == year && date.getUTCMonth() < month)) {
				cls.push('old');
			} else if (date.getUTCFullYear() > year || (date.getUTCFullYear() == year && date.getUTCMonth() > month)) {
				cls.push('new');
			}
			// Compare internal UTC date with local today, not UTC today
			if (this.o.todayHighlight &&
				date.getUTCFullYear() == today.getFullYear() &&
				date.getUTCMonth() == today.getMonth() &&
				date.getUTCDate() == today.getDate()) {
				cls.push('today');
			}
			if (currentDate && date.valueOf() == currentDate) {
				cls.push('active');
			}
			if (date.valueOf() < this.o.startDate || date.valueOf() > this.o.endDate ||
				$.inArray(date.getUTCDay(), this.o.daysOfWeekDisabled) !== -1) {
				cls.push('disabled');
			}
			if (this.range){
				if (date > this.range[0] && date < this.range[this.range.length-1]){
					cls.push('range');
				}
				if ($.inArray(date.valueOf(), this.range) != -1){
					cls.push('selected');
				}
			}
			return cls;
		},

		fill: function() {
			var d = new Date(this.viewDate),
				year = d.getUTCFullYear(),
				month = d.getUTCMonth(),
				startYear = this.o.startDate !== -Infinity ? this.o.startDate.getUTCFullYear() : -Infinity,
				startMonth = this.o.startDate !== -Infinity ? this.o.startDate.getUTCMonth() : -Infinity,
				endYear = this.o.endDate !== Infinity ? this.o.endDate.getUTCFullYear() : Infinity,
				endMonth = this.o.endDate !== Infinity ? this.o.endDate.getUTCMonth() : Infinity,
				currentDate = this.date && this.date.valueOf(),
				tooltip;
			this.picker.find('.datepicker-days thead th.datepicker-switch')
						.text(dates[this.o.language].months[month]+' '+year);
			this.picker.find('tfoot th.today')
						.text(dates[this.o.language].today)
						.toggle(this.o.todayBtn !== false);
			this.picker.find('tfoot th.clear')
						.text(dates[this.o.language].clear)
						.toggle(this.o.clearBtn !== false);
			this.updateNavArrows();
			this.fillMonths();
			var prevMonth = UTCDate(year, month-1, 28,0,0,0,0),
				day = DPGlobal.getDaysInMonth(prevMonth.getUTCFullYear(), prevMonth.getUTCMonth());
			prevMonth.setUTCDate(day);
			prevMonth.setUTCDate(day - (prevMonth.getUTCDay() - this.o.weekStart + 7)%7);
			var nextMonth = new Date(prevMonth);
			nextMonth.setUTCDate(nextMonth.getUTCDate() + 42);
			nextMonth = nextMonth.valueOf();
			var html = [];
			var clsName;
			while(prevMonth.valueOf() < nextMonth) {
				if (prevMonth.getUTCDay() == this.o.weekStart) {
					html.push('<tr>');
					if(this.o.calendarWeeks){
						// ISO 8601: First week contains first thursday.
						// ISO also states week starts on Monday, but we can be more abstract here.
						var
							// Start of current week: based on weekstart/current date
							ws = new Date(+prevMonth + (this.o.weekStart - prevMonth.getUTCDay() - 7) % 7 * 864e5),
							// Thursday of this week
							th = new Date(+ws + (7 + 4 - ws.getUTCDay()) % 7 * 864e5),
							// First Thursday of year, year from thursday
							yth = new Date(+(yth = UTCDate(th.getUTCFullYear(), 0, 1)) + (7 + 4 - yth.getUTCDay())%7*864e5),
							// Calendar week: ms between thursdays, div ms per day, div 7 days
							calWeek =  (th - yth) / 864e5 / 7 + 1;
						html.push('<td class="cw">'+ calWeek +'</td>');

					}
				}
				clsName = this.getClassNames(prevMonth);
				clsName.push('day');

				var before = this.o.beforeShowDay(prevMonth);
				if (before === undefined)
					before = {};
				else if (typeof(before) === 'boolean')
					before = {enabled: before};
				else if (typeof(before) === 'string')
					before = {classes: before};
				if (before.enabled === false)
					clsName.push('disabled');
				if (before.classes)
					clsName = clsName.concat(before.classes.split(/\s+/));
				if (before.tooltip)
					tooltip = before.tooltip;

				clsName = $.unique(clsName);
				html.push('<td class="'+clsName.join(' ')+'"' + (tooltip ? ' title="'+tooltip+'"' : '') + '>'+prevMonth.getUTCDate() + '</td>');
				if (prevMonth.getUTCDay() == this.o.weekEnd) {
					html.push('</tr>');
				}
				prevMonth.setUTCDate(prevMonth.getUTCDate()+1);
			}
			this.picker.find('.datepicker-days tbody').empty().append(html.join(''));
			var currentYear = this.date && this.date.getUTCFullYear();

			var months = this.picker.find('.datepicker-months')
						.find('th:eq(1)')
							.text(year)
							.end()
						.find('span').removeClass('active');
			if (currentYear && currentYear == year) {
				months.eq(this.date.getUTCMonth()).addClass('active');
			}
			if (year < startYear || year > endYear) {
				months.addClass('disabled');
			}
			if (year == startYear) {
				months.slice(0, startMonth).addClass('disabled');
			}
			if (year == endYear) {
				months.slice(endMonth+1).addClass('disabled');
			}

			html = '';
			year = parseInt(year/10, 10) * 10;
			var yearCont = this.picker.find('.datepicker-years')
								.find('th:eq(1)')
									.text(year + '-' + (year + 9))
									.end()
								.find('td');
			year -= 1;
			for (var i = -1; i < 11; i++) {
				html += '<span class="year'+(i == -1 ? ' old' : i == 10 ? ' new' : '')+(currentYear == year ? ' active' : '')+(year < startYear || year > endYear ? ' disabled' : '')+'">'+year+'</span>';
				year += 1;
			}
			yearCont.html(html);
		},

		updateNavArrows: function() {
			if (!this._allow_update) return;

			var d = new Date(this.viewDate),
				year = d.getUTCFullYear(),
				month = d.getUTCMonth();
			switch (this.viewMode) {
				case 0:
					if (this.o.startDate !== -Infinity && year <= this.o.startDate.getUTCFullYear() && month <= this.o.startDate.getUTCMonth()) {
						this.picker.find('.prev').css({visibility: 'hidden'});
					} else {
						this.picker.find('.prev').css({visibility: 'visible'});
					}
					if (this.o.endDate !== Infinity && year >= this.o.endDate.getUTCFullYear() && month >= this.o.endDate.getUTCMonth()) {
						this.picker.find('.next').css({visibility: 'hidden'});
					} else {
						this.picker.find('.next').css({visibility: 'visible'});
					}
					break;
				case 1:
				case 2:
					if (this.o.startDate !== -Infinity && year <= this.o.startDate.getUTCFullYear()) {
						this.picker.find('.prev').css({visibility: 'hidden'});
					} else {
						this.picker.find('.prev').css({visibility: 'visible'});
					}
					if (this.o.endDate !== Infinity && year >= this.o.endDate.getUTCFullYear()) {
						this.picker.find('.next').css({visibility: 'hidden'});
					} else {
						this.picker.find('.next').css({visibility: 'visible'});
					}
					break;
			}
		},

		click: function(e) {
			e.preventDefault();
			var target = $(e.target).closest('span, td, th');
			if (target.length == 1) {
				switch(target[0].nodeName.toLowerCase()) {
					case 'th':
						switch(target[0].className) {
							case 'datepicker-switch':
								this.showMode(1);
								break;
							case 'prev':
							case 'next':
								var dir = DPGlobal.modes[this.viewMode].navStep * (target[0].className == 'prev' ? -1 : 1);
								switch(this.viewMode){
									case 0:
										this.viewDate = this.moveMonth(this.viewDate, dir);
										break;
									case 1:
									case 2:
										this.viewDate = this.moveYear(this.viewDate, dir);
										break;
								}
								this.fill();
								break;
							case 'today':
								var date = new Date();
								date = UTCDate(date.getFullYear(), date.getMonth(), date.getDate(), 0, 0, 0);

								this.showMode(-2);
								var which = this.o.todayBtn == 'linked' ? null : 'view';
								this._setDate(date, which);
								break;
							case 'clear':
								var element;
								if (this.isInput)
									element = this.element;
								else if (this.component)
									element = this.element.find('input');
								if (element)
									element.val("").change();
								this._trigger('changeDate');
								this.update();
								if (this.o.autoclose)
									this.hide();
								break;
						}
						break;
					case 'span':
						if (!target.is('.disabled')) {
							this.viewDate.setUTCDate(1);
							if (target.is('.month')) {
								var day = 1;
								var month = target.parent().find('span').index(target);
								var year = this.viewDate.getUTCFullYear();
								this.viewDate.setUTCMonth(month);
								this._trigger('changeMonth', this.viewDate);
								if (this.o.minViewMode === 1) {
									this._setDate(UTCDate(year, month, day,0,0,0,0));
								}
							} else {
								var year = parseInt(target.text(), 10)||0;
								var day = 1;
								var month = 0;
								this.viewDate.setUTCFullYear(year);
								this._trigger('changeYear', this.viewDate);
								if (this.o.minViewMode === 2) {
									this._setDate(UTCDate(year, month, day,0,0,0,0));
								}
							}
							this.showMode(-1);
							this.fill();
						}
						break;
					case 'td':
						if (target.is('.day') && !target.is('.disabled')){
							var day = parseInt(target.text(), 10)||1;
							var year = this.viewDate.getUTCFullYear(),
								month = this.viewDate.getUTCMonth();
							if (target.is('.old')) {
								if (month === 0) {
									month = 11;
									year -= 1;
								} else {
									month -= 1;
								}
							} else if (target.is('.new')) {
								if (month == 11) {
									month = 0;
									year += 1;
								} else {
									month += 1;
								}
							}
							this._setDate(UTCDate(year, month, day,0,0,0,0));
						}
						break;
				}
			}
		},

		_setDate: function(date, which){
			if (!which || which == 'date')
				this.date = new Date(date);
			if (!which || which  == 'view')
				this.viewDate = new Date(date);
			this.fill();
			this.setValue();
			this._trigger('changeDate');
			var element;
			if (this.isInput) {
				element = this.element;
			} else if (this.component){
				element = this.element.find('input');
			}
			if (element) {
				element.change();
				if (this.o.autoclose && (!which || which == 'date')) {
					this.hide();
				}
			}
		},

		moveMonth: function(date, dir){
			if (!dir) return date;
			var new_date = new Date(date.valueOf()),
				day = new_date.getUTCDate(),
				month = new_date.getUTCMonth(),
				mag = Math.abs(dir),
				new_month, test;
			dir = dir > 0 ? 1 : -1;
			if (mag == 1){
				test = dir == -1
					// If going back one month, make sure month is not current month
					// (eg, Mar 31 -> Feb 31 == Feb 28, not Mar 02)
					? function(){ return new_date.getUTCMonth() == month; }
					// If going forward one month, make sure month is as expected
					// (eg, Jan 31 -> Feb 31 == Feb 28, not Mar 02)
					: function(){ return new_date.getUTCMonth() != new_month; };
				new_month = month + dir;
				new_date.setUTCMonth(new_month);
				// Dec -> Jan (12) or Jan -> Dec (-1) -- limit expected date to 0-11
				if (new_month < 0 || new_month > 11)
					new_month = (new_month + 12) % 12;
			} else {
				// For magnitudes >1, move one month at a time...
				for (var i=0; i<mag; i++)
					// ...which might decrease the day (eg, Jan 31 to Feb 28, etc)...
					new_date = this.moveMonth(new_date, dir);
				// ...then reset the day, keeping it in the new month
				new_month = new_date.getUTCMonth();
				new_date.setUTCDate(day);
				test = function(){ return new_month != new_date.getUTCMonth(); };
			}
			// Common date-resetting loop -- if date is beyond end of month, make it
			// end of month
			while (test()){
				new_date.setUTCDate(--day);
				new_date.setUTCMonth(new_month);
			}
			return new_date;
		},

		moveYear: function(date, dir){
			return this.moveMonth(date, dir*12);
		},

		dateWithinRange: function(date){
			return date >= this.o.startDate && date <= this.o.endDate;
		},

		keydown: function(e){
			if (this.picker.is(':not(:visible)')){
				if (e.keyCode == 27) // allow escape to hide and re-show picker
					this.show();
				return;
			}
			var dateChanged = false,
				dir, day, month,
				newDate, newViewDate;
			switch(e.keyCode){
				case 27: // escape
					this.hide();
					e.preventDefault();
					break;
				case 37: // left
				case 39: // right
					if (!this.o.keyboardNavigation) break;
					dir = e.keyCode == 37 ? -1 : 1;
					if (e.ctrlKey){
						newDate = this.moveYear(this.date, dir);
						newViewDate = this.moveYear(this.viewDate, dir);
					} else if (e.shiftKey){
						newDate = this.moveMonth(this.date, dir);
						newViewDate = this.moveMonth(this.viewDate, dir);
					} else {
						newDate = new Date(this.date);
						newDate.setUTCDate(this.date.getUTCDate() + dir);
						newViewDate = new Date(this.viewDate);
						newViewDate.setUTCDate(this.viewDate.getUTCDate() + dir);
					}
					if (this.dateWithinRange(newDate)){
						this.date = newDate;
						this.viewDate = newViewDate;
						this.setValue();
						this.update();
						e.preventDefault();
						dateChanged = true;
					}
					break;
				case 38: // up
				case 40: // down
					if (!this.o.keyboardNavigation) break;
					dir = e.keyCode == 38 ? -1 : 1;
					if (e.ctrlKey){
						newDate = this.moveYear(this.date, dir);
						newViewDate = this.moveYear(this.viewDate, dir);
					} else if (e.shiftKey){
						newDate = this.moveMonth(this.date, dir);
						newViewDate = this.moveMonth(this.viewDate, dir);
					} else {
						newDate = new Date(this.date);
						newDate.setUTCDate(this.date.getUTCDate() + dir * 7);
						newViewDate = new Date(this.viewDate);
						newViewDate.setUTCDate(this.viewDate.getUTCDate() + dir * 7);
					}
					if (this.dateWithinRange(newDate)){
						this.date = newDate;
						this.viewDate = newViewDate;
						this.setValue();
						this.update();
						e.preventDefault();
						dateChanged = true;
					}
					break;
				case 13: // enter
					this.hide();
					e.preventDefault();
					break;
				case 9: // tab
					this.hide();
					break;
			}
			if (dateChanged){
				this._trigger('changeDate');
				var element;
				if (this.isInput) {
					element = this.element;
				} else if (this.component){
					element = this.element.find('input');
				}
				if (element) {
					element.change();
				}
			}
		},

		showMode: function(dir) {
			if (dir) {
				this.viewMode = Math.max(this.o.minViewMode, Math.min(2, this.viewMode + dir));
			}
			/*
				vitalets: fixing bug of very special conditions:
				jquery 1.7.1 + webkit + show inline datepicker in bootstrap popover.
				Method show() does not set display css correctly and datepicker is not shown.
				Changed to .css('display', 'block') solve the problem.
				See https://github.com/vitalets/x-editable/issues/37

				In jquery 1.7.2+ everything works fine.
			*/
			//this.picker.find('>div').hide().filter('.datepicker-'+DPGlobal.modes[this.viewMode].clsName).show();
			this.picker.find('>div').hide().filter('.datepicker-'+DPGlobal.modes[this.viewMode].clsName).css('display', 'block');
			this.updateNavArrows();
		}
	};

	var DateRangePicker = function(element, options){
		this.element = $(element);
		this.inputs = $.map(options.inputs, function(i){ return i.jquery ? i[0] : i; });
		delete options.inputs;

		$(this.inputs)
			.datepicker(options)
			.bind('changeDate', $.proxy(this.dateUpdated, this));

		this.pickers = $.map(this.inputs, function(i){ return $(i).data('datepicker'); });
		this.updateDates();
	};
	DateRangePicker.prototype = {
		updateDates: function(){
			this.dates = $.map(this.pickers, function(i){ return i.date; });
			this.updateRanges();
		},
		updateRanges: function(){
			var range = $.map(this.dates, function(d){ return d.valueOf(); });
			$.each(this.pickers, function(i, p){
				p.setRange(range);
			});
		},
		dateUpdated: function(e){
			var dp = $(e.target).data('datepicker'),
				new_date = dp.getUTCDate(),
				i = $.inArray(e.target, this.inputs),
				l = this.inputs.length;
			if (i == -1) return;

			if (new_date < this.dates[i]){
				// Date being moved earlier/left
				while (i>=0 && new_date < this.dates[i]){
					this.pickers[i--].setUTCDate(new_date);
				}
			}
			else if (new_date > this.dates[i]){
				// Date being moved later/right
				while (i<l && new_date > this.dates[i]){
					this.pickers[i++].setUTCDate(new_date);
				}
			}
			this.updateDates();
		},
		remove: function(){
			$.map(this.pickers, function(p){ p.remove(); });
			delete this.element.data().datepicker;
		}
	};

	function opts_from_el(el, prefix){
		// Derive options from element data-attrs
		var data = $(el).data(),
			out = {}, inkey,
			replace = new RegExp('^' + prefix.toLowerCase() + '([A-Z])'),
			prefix = new RegExp('^' + prefix.toLowerCase());
		for (var key in data)
			if (prefix.test(key)){
				inkey = key.replace(replace, function(_,a){ return a.toLowerCase(); });
				out[inkey] = data[key];
			}
		return out;
	}

	function opts_from_locale(lang){
		// Derive options from locale plugins
		var out = {};
		// Check if "de-DE" style date is available, if not language should
		// fallback to 2 letter code eg "de"
		if (!dates[lang]) {
			lang = lang.split('-')[0]
			if (!dates[lang])
				return;
		}
		var d = dates[lang];
		$.each(locale_opts, function(i,k){
			if (k in d)
				out[k] = d[k];
		});
		return out;
	}

	var old = $.fn.datepicker;
	$.fn.datepicker = function ( option ) {
		var args = Array.apply(null, arguments);
		args.shift();
		var internal_return,
			this_return;
		this.each(function () {
			var $this = $(this),
				data = $this.data('datepicker'),
				options = typeof option == 'object' && option;
			if (!data) {
				var elopts = opts_from_el(this, 'date'),
					// Preliminary otions
					xopts = $.extend({}, defaults, elopts, options),
					locopts = opts_from_locale(xopts.language),
					// Options priority: js args, data-attrs, locales, defaults
					opts = $.extend({}, defaults, locopts, elopts, options);
				if ($this.is('.input-daterange') || opts.inputs){
					var ropts = {
						inputs: opts.inputs || $this.find('input').toArray()
					};
					$this.data('datepicker', (data = new DateRangePicker(this, $.extend(opts, ropts))));
				}
				else{
					$this.data('datepicker', (data = new Datepicker(this, opts)));
				}
			}
			if (typeof option == 'string' && typeof data[option] == 'function') {
				internal_return = data[option].apply(data, args);
				if (internal_return !== undefined)
					return false;
			}
		});
		if (internal_return !== undefined)
			return internal_return;
		else
			return this;
	};

	var defaults = $.fn.datepicker.defaults = {
		autoclose: true,
		beforeShowDay: $.noop,
		calendarWeeks: false,
		clearBtn: false,
		daysOfWeekDisabled: [],
		endDate: Infinity,
		forceParse: true,
		format: 'yyyy-mm-dd',
		keyboardNavigation: true,
		language: 'en',
		minViewMode: 0,
		rtl: false,
		startDate: -Infinity,
		startView: 0,
		todayBtn: false,
		todayHighlight: true,
		weekStart: 0
	};
	var locale_opts = $.fn.datepicker.locale_opts = [
		'format',
		'rtl',
		'weekStart'
	];
	$.fn.datepicker.Constructor = Datepicker;
	var dates = $.fn.datepicker.dates = {
		en: {
			days: ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"],
			daysShort: ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"],
			daysMin: ["Su", "Mo", "Tu", "We", "Th", "Fr", "Sa", "Su"],
			months: ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"],
			monthsShort: ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"],
			today: "Today",
			clear: "Clear"
		}
	};

	var DPGlobal = {
		modes: [
			{
				clsName: 'days',
				navFnc: 'Month',
				navStep: 1
			},
			{
				clsName: 'months',
				navFnc: 'FullYear',
				navStep: 1
			},
			{
				clsName: 'years',
				navFnc: 'FullYear',
				navStep: 10
		}],
		isLeapYear: function (year) {
			return (((year % 4 === 0) && (year % 100 !== 0)) || (year % 400 === 0));
		},
		getDaysInMonth: function (year, month) {
			return [31, (DPGlobal.isLeapYear(year) ? 29 : 28), 31, 30, 31, 30, 31, 31, 30, 31, 30, 31][month];
		},
		validParts: /dd?|DD?|mm?|MM?|yy(?:yy)?/g,
		nonpunctuation: /[^ -\/:-@\[\u3400-\u9fff-`{-~\t\n\r]+/g,
		parseFormat: function(format){
			// IE treats \0 as a string end in inputs (truncating the value),
			// so it's a bad format delimiter, anyway
			var separators = format.replace(this.validParts, '-0').split('-0'),
				parts = format.match(this.validParts);
			if (!separators || !separators.length || !parts || parts.length === 0){
				throw new Error("Invalid date format.");
			}
			return {separators: separators, parts: parts};
		},
		parseDate: function(date, format, language) {
			if (date instanceof Date) return date;
			if (typeof format === 'string')
				format = DPGlobal.parseFormat(format);
			if (/^[\-+]\d+[dmwy]([\s,]+[\-+]\d+[dmwy])*$/.test(date)) {
				var part_re = /([\-+]\d+)([dmwy])/,
					parts = date.match(/([\-+]\d+)([dmwy])/g),
					part, dir;
				date = new Date();
				for (var i=0; i<parts.length; i++) {
					part = part_re.exec(parts[i]);
					dir = parseInt(part[1]);
					switch(part[2]){
						case 'd':
							date.setUTCDate(date.getUTCDate() + dir);
							break;
						case 'm':
							date = Datepicker.prototype.moveMonth.call(Datepicker.prototype, date, dir);
							break;
						case 'w':
							date.setUTCDate(date.getUTCDate() + dir * 7);
							break;
						case 'y':
							date = Datepicker.prototype.moveYear.call(Datepicker.prototype, date, dir);
							break;
					}
				}
				return UTCDate(date.getUTCFullYear(), date.getUTCMonth(), date.getUTCDate(), 0, 0, 0);
			}
			var parts = date && date.match(this.nonpunctuation) || [],
				date = new Date(),
				parsed = {},
				setters_order = ['yyyy', 'yy', 'M', 'MM', 'm', 'mm', 'd', 'dd'],
				setters_map = {
					yyyy: function(d,v){ return d.setUTCFullYear(v); },
					yy: function(d,v){ return d.setUTCFullYear(2000+v); },
					m: function(d,v){
						if (isNaN(d))
							return d;
						v -= 1;
						while (v<0) v += 12;
						v %= 12;
						d.setUTCMonth(v);
						while (d.getUTCMonth() != v)
							d.setUTCDate(d.getUTCDate()-1);
						return d;
					},
					d: function(d,v){ return d.setUTCDate(v); }
				},
				val, filtered, part;
			setters_map['M'] = setters_map['MM'] = setters_map['mm'] = setters_map['m'];
			setters_map['dd'] = setters_map['d'];
			date = UTCDate(date.getFullYear(), date.getMonth(), date.getDate(), 0, 0, 0);
			var fparts = format.parts.slice();
			// Remove noop parts
			if (parts.length != fparts.length) {
				fparts = $(fparts).filter(function(i,p){
					return $.inArray(p, setters_order) !== -1;
				}).toArray();
			}
			// Process remainder
			if (parts.length == fparts.length) {
				for (var i=0, cnt = fparts.length; i < cnt; i++) {
					val = parseInt(parts[i], 10);
					part = fparts[i];
					if (isNaN(val)) {
						switch(part) {
							case 'MM':
								filtered = $(dates[language].months).filter(function(){
									var m = this.slice(0, parts[i].length),
										p = parts[i].slice(0, m.length);
									return m == p;
								});
								val = $.inArray(filtered[0], dates[language].months) + 1;
								break;
							case 'M':
								filtered = $(dates[language].monthsShort).filter(function(){
									var m = this.slice(0, parts[i].length),
										p = parts[i].slice(0, m.length);
									return m == p;
								});
								val = $.inArray(filtered[0], dates[language].monthsShort) + 1;
								break;
						}
					}
					parsed[part] = val;
				}
				for (var i=0, _date, s; i<setters_order.length; i++){
					s = setters_order[i];
					if (s in parsed && !isNaN(parsed[s])){
						_date = new Date(date);
						setters_map[s](_date, parsed[s]);
						if (!isNaN(_date))
							date = _date;
					}
				}
			}
			return date;
		},
		formatDate: function(date, format, language){
			if (typeof format === 'string')
				format = DPGlobal.parseFormat(format);
			var val = {
				d: date.getUTCDate(),
				D: dates[language].daysShort[date.getUTCDay()],
				DD: dates[language].days[date.getUTCDay()],
				m: date.getUTCMonth() + 1,
				M: dates[language].monthsShort[date.getUTCMonth()],
				MM: dates[language].months[date.getUTCMonth()],
				yy: date.getUTCFullYear().toString().substring(2),
				yyyy: date.getUTCFullYear()
			};
			val.dd = (val.d < 10 ? '0' : '') + val.d;
			val.mm = (val.m < 10 ? '0' : '') + val.m;
			var date = [],
				seps = $.extend([], format.separators);
			for (var i=0, cnt = format.parts.length; i <= cnt; i++) {
				if (seps.length)
					date.push(seps.shift());
				date.push(val[format.parts[i]]);
			}
			return date.join('');
		},
		headTemplate: '<thead>'+
							'<tr>'+
								'<th class="prev"><i class="lnr lnr-chevron-left"/></th>'+
								'<th colspan="5" class="datepicker-switch"></th>'+
								'<th class="next"><i class="lnr lnr-chevron-right"/></th>'+
							'</tr>'+
						'</thead>',
		contTemplate: '<tbody><tr><td colspan="7"></td></tr></tbody>',
		footTemplate: '<tfoot><tr><th colspan="7" class="today"></th></tr><tr><th colspan="7" class="clear"></th></tr></tfoot>'
	};
	DPGlobal.template = '<div class="datepicker">'+
							'<div class="datepicker-days">'+
								'<table class=" table-condensed">'+
									DPGlobal.headTemplate+
									'<tbody></tbody>'+
									DPGlobal.footTemplate+
								'</table>'+
							'</div>'+
							'<div class="datepicker-months">'+
								'<table class="table-condensed">'+
									DPGlobal.headTemplate+
									DPGlobal.contTemplate+
									DPGlobal.footTemplate+
								'</table>'+
							'</div>'+
							'<div class="datepicker-years">'+
								'<table class="table-condensed">'+
									DPGlobal.headTemplate+
									DPGlobal.contTemplate+
									DPGlobal.footTemplate+
								'</table>'+
							'</div>'+
						'</div>';

	$.fn.datepicker.DPGlobal = DPGlobal;


	/* DATEPICKER NO CONFLICT
	* =================== */

	$.fn.datepicker.noConflict = function(){
		$.fn.datepicker = old;
		return this;
	};


	/* DATEPICKER DATA-API
	* ================== */

	$(document).on(
		'focus.datepicker.data-api click.datepicker.data-api',
		'[data-provide="datepicker"]',
		function(e){
			var $this = $(this);
			if ($this.data('datepicker')) return;
			e.preventDefault();
			// component click requires us to explicitly show it
			$this.datepicker('show');
		}
	);
	$(function(){
		$('[data-provide="datepicker-inline"]').datepicker();
	});

}( window.jQuery ));
