dojo.provide("dijit.Calendar");

dojo.require("dojo.cldr.supplemental");
dojo.require("dojo.date");
dojo.require("dojo.date.locale");

dojo.require("dijit._Widget");
dojo.require("dijit._Templated");
dojo.require("dijit._CssStateMixin");

dojo.declare(
	"dijit.Calendar",
	[dijit._Widget, dijit._Templated, dijit._CssStateMixin],
	{
		// summary:
		//		A simple GUI for choosing a date in the context of a monthly calendar.
		//
		// description:
		//		A simple GUI for choosing a date in the context of a monthly calendar.
		//		This widget can't be used in a form because it doesn't serialize the date to an
		//		`<input>` field.  For a form element, use dijit.form.DateTextBox instead.
		//
		//		Note that the parser takes all dates attributes passed in the
		//		[RFC 3339 format](http://www.faqs.org/rfcs/rfc3339.html), e.g. `2005-06-30T08:05:00-07:00`
		//		so that they are serializable and locale-independent.
		//
		// example:
		//	|	var calendar = new dijit.Calendar({}, dojo.byId("calendarNode"));
		//
		// example:
		//	|	<div dojoType="dijit.Calendar"></div>

		templateString: dojo.cache("dijit", "templates/Calendar.html"),

		// value: Date
		//		The currently selected Date
		value: new Date(),

		// datePackage: String
		//		JavaScript namespace to find Calendar routines.  Uses Gregorian Calendar routines
		//		at dojo.date by default.
		datePackage: "dojo.date",

		// dayWidth: String
		//		How to represent the days of the week in the calendar header. See dojo.date.locale
		dayWidth: "narrow",

		// tabIndex: Integer
		//		Order fields are traversed when user hits the tab key
		tabIndex: "0",
		
		baseClass:"dijitCalendar",

		// Set node classes for various mouse events, see dijit._CssStateMixin for more details 
		cssStateNodes: {
			"decrementMonth": "dijitCalendarArrow",
			"incrementMonth": "dijitCalendarArrow",
			"previousYearLabelNode": "dijitCalendarPreviousYear",
			"nextYearLabelNode": "dijitCalendarNextYear"			
		},

		attributeMap: dojo.delegate(dijit._Widget.prototype.attributeMap, {
			tabIndex: "domNode"
 		}),

		setValue: function(/*Date*/ value){
			// summary:
			//      Deprecated.   Used attr('value', ...) instead.
			// tags:
			//      deprecated
			dojo.deprecated("dijit.Calendar:setValue() is deprecated.  Use set('value', ...) instead.", "", "2.0");
			this.set('value', value);
		},

		_getValueAttr: function(){
			// summary:
			//		Support getter attr('value')
			var value = new this.dateClassObj(this.value);
			value.setHours(0, 0, 0, 0); // return midnight, local time for back-compat

			// If daylight savings pushes midnight to the previous date, fix the Date
			// object to point at 1am so it will represent the correct day. See #9366
			if(value.getDate() < this.value.getDate()){
				value = this.dateFuncObj.add(value, "hour", 1);
			}
			return value;
		},

		_setValueAttr: function(/*Date*/ value){
			// summary:
			//		Support setter attr("value", ...)
			// description:
			// 		Set the current date and update the UI.  If the date is disabled, the value will
			//		not change, but the display will change to the corresponding month.
			// tags:
			//      protected
			if(!this.value || this.dateFuncObj.compare(value, this.value)){
				value = new this.dateClassObj(value);
				value.setHours(1); // to avoid issues when DST shift occurs at midnight, see #8521, #9366
				this.displayMonth = new this.dateClassObj(value);
				if(!this.isDisabledDate(value, this.lang)){
					this.value = value;
					this.onChange(this.get('value'));
				}
				dojo.attr(this.domNode, "aria-label",
					this.dateLocaleModule.format(value,
						{selector:"date", formatLength:"full"}));
				this._populateGrid();
			}
		},

		_setText: function(node, text){
			// summary:
			//		This just sets the content of node to the specified text.
			//		Can't do "node.innerHTML=text" because of an IE bug w/tables, see #3434.
			// tags:
			//      private
			while(node.firstChild){
				node.removeChild(node.firstChild);
			}
			node.appendChild(dojo.doc.createTextNode(text));
		},

		_populateGrid: function(){
			// summary:
			//      Fills in the calendar grid with each day (1-31)
			// tags:
			//      private
			var month = this.displayMonth;
			month.setDate(1);
			var firstDay = month.getDay(),
				daysInMonth = this.dateFuncObj.getDaysInMonth(month),
				daysInPreviousMonth = this.dateFuncObj.getDaysInMonth(this.dateFuncObj.add(month, "month", -1)),
				today = new this.dateClassObj(),
				dayOffset = dojo.cldr.supplemental.getFirstDayOfWeek(this.lang);
			if(dayOffset > firstDay){ dayOffset -= 7; }

			// Iterate through dates in the calendar and fill in date numbers and style info
			dojo.query(".dijitCalendarDateTemplate", this.domNode).forEach(function(template, i){
				i += dayOffset;
				var date = new this.dateClassObj(month),
					number, clazz = "dijitCalendar", adj = 0;

				if(i < firstDay){
					number = daysInPreviousMonth - firstDay + i + 1;
					adj = -1;
					clazz += "Previous";
				}else if(i >= (firstDay + daysInMonth)){
					number = i - firstDay - daysInMonth + 1;
					adj = 1;
					clazz += "Next";
				}else{
					number = i - firstDay + 1;
					clazz += "Current";
				}

				if(adj){
					date = this.dateFuncObj.add(date, "month", adj);
				}
				date.setDate(number);

				if(!this.dateFuncObj.compare(date, today, "date")){
					clazz = "dijitCalendarCurrentDate " + clazz;
				}

				if(this._isSelectedDate(date, this.lang)){
					clazz = "dijitCalendarSelectedDate " + clazz;
				}

				if(this.isDisabledDate(date, this.lang)){
					clazz = "dijitCalendarDisabledDate " + clazz;
				}

				var clazz2 = this.getClassForDate(date, this.lang);
				if(clazz2){
					clazz = clazz2 + " " + clazz;
				}

				template.className = clazz + "Month dijitCalendarDateTemplate";
				template.dijitDateValue = date.valueOf();
				var label = dojo.query(".dijitCalendarDateLabel", template)[0],
					text = date.getDateLocalized ? date.getDateLocalized(this.lang) : date.getDate();
				this._setText(label, text);
			}, this);

			// Fill in localized month name
			var monthNames = this.dateLocaleModule.getNames('months', 'wide', 'standAlone', this.lang, month);
			this._setText(this.monthLabelNode, monthNames[month.getMonth()]);
			// Repopulate month list based on current year (Hebrew calendar)
			dojo.query(".dijitCalendarMonthLabelTemplate", this.domNode).forEach(function(node, i){
				dojo.toggleClass(node, "dijitHidden", !(i in monthNames)); // hide leap months (Hebrew)
				this._setText(node, monthNames[i]);
			}, this);

			// Fill in localized prev/current/next years
			var y = month.getFullYear() - 1;
			var d = new this.dateClassObj();
			dojo.forEach(["previous", "current", "next"], function(name){
				d.setFullYear(y++);
				this._setText(this[name+"YearLabelNode"],
					this.dateLocaleModule.format(d, {selector:'year', locale:this.lang}));
			}, this);
		},

		goToToday: function(){
			// summary:
			//      Sets calendar's value to today's date
			this.set('value', new this.dateClassObj());
		},

		constructor: function(/*Object*/args){
			var dateClass = (args.datePackage && (args.datePackage != "dojo.date"))? args.datePackage + ".Date" : "Date";
			this.dateClassObj = dojo.getObject(dateClass, false);
			this.datePackage = args.datePackage || this.datePackage;
			this.dateFuncObj = dojo.getObject(this.datePackage, false);
			this.dateLocaleModule = dojo.getObject(this.datePackage + ".locale", false);
		},

		postMixInProperties: function(){
			// parser.instantiate sometimes passes in NaN for IE.  Use default value in prototype instead.
			if(isNaN(this.value)){ delete this.value; }
			this.inherited(arguments);
		},

		postCreate: function(){
			this.inherited(arguments);
			dojo.setSelectable(this.domNode, false);

			var cloneClass = dojo.hitch(this, function(clazz, n){
				var template = dojo.query(clazz, this.domNode)[0];
	 			for(var i=0; i<n; i++){
					template.parentNode.appendChild(template.cloneNode(true));
				}
			});

			// clone the day label and calendar day templates 6 times to make 7 columns
			cloneClass(".dijitCalendarDayLabelTemplate", 6);
			cloneClass(".dijitCalendarDateTemplate", 6);

			// now make 6 week rows
			cloneClass(".dijitCalendarWeekTemplate", 5);

			// insert localized day names in the header
			var dayNames = this.dateLocaleModule.getNames('days', this.dayWidth, 'standAlone', this.lang);
			var dayOffset = dojo.cldr.supplemental.getFirstDayOfWeek(this.lang);
			dojo.query(".dijitCalendarDayLabel", this.domNode).forEach(function(label, i){
				this._setText(label, dayNames[(i + dayOffset) % 7]);
			}, this);

			var dateObj = new this.dateClassObj(this.value);
			// Fill in spacer/month dropdown element with all the month names (invisible) so that the maximum width will affect layout
			var monthNames = this.dateLocaleModule.getNames('months', 'wide', 'standAlone', this.lang, dateObj);
			cloneClass(".dijitCalendarMonthLabelTemplate", monthNames.length-1);
			dojo.query(".dijitCalendarMonthLabelTemplate", this.domNode).forEach(function(node, i){
				dojo.attr(node, "month", i);
				if(i in monthNames){ this._setText(node, monthNames[i]); }
				dojo.place(node.cloneNode(true), this.monthLabelSpacer);
			}, this);

			this.value = null;
			this.set('value', dateObj);

			// Set up repeating mouse behavior
			var _this = this;
			var typematic = function(nodeProp, dateProp, adj){
				_this._connects.push(
					dijit.typematic.addMouseListener(_this[nodeProp], _this, function(count){
						if(count >= 0){ _this._adjustDisplay(dateProp, adj); }
					}, 0.8, 500)
				);
			};
			typematic("incrementMonth", "month", 1);
			typematic("decrementMonth", "month", -1);
			typematic("nextYearLabelNode", "year", 1);
			typematic("previousYearLabelNode", "year", -1);
		},

		_onMenuHover: function(e){
			dojo.stopEvent(e);
			dojo.toggleClass(e.target, "dijitMenuItemHover");
		},

		_adjustDisplay: function(/*String*/ part, /*int*/ amount){
			// summary:
			//      Moves calendar forwards or backwards by months or years
			// part:
			//      "month" or "year"
			// amount:
			//      Number of months or years
			// tags:
			//      private
			this.displayMonth = this.dateFuncObj.add(this.displayMonth, part, amount);
			this._populateGrid();
		},

		_onMonthToggle: function(/*Event*/ evt){
			// summary:
			//      Handler for when user triggers or dismisses the month list
			// tags:
			//      protected
			dojo.stopEvent(evt);

			if(evt.type == "mousedown"){
				var coords = dojo.position(this.monthLabelNode);
//				coords.y -= dojo.position(this.domNode, true).y;
				// Size the dropdown's width to match the label in the widget
				// so that they are horizontally aligned
				var dim = {
					width: coords.w + "px",
					top: -this.displayMonth.getMonth() * coords.h + "px"
				};
				if((dojo.isIE && dojo.isQuirks) || dojo.isIE < 7){
					dim.left = -coords.w/2 + "px";
				}
				dojo.style(this.monthDropDown, dim);
				this._popupHandler = this.connect(document, "onmouseup", "_onMonthToggle");
			}else{
				this.disconnect(this._popupHandler);
				delete this._popupHandler;
			}

			dojo.toggleClass(this.monthDropDown, "dijitHidden");
			dojo.toggleClass(this.monthLabelNode, "dijitVisible");
		},

		_onMonthSelect: function(/*Event*/ evt){
			// summary:
			//      Handler for when user selects a month from a list
			// tags:
			//      protected
			this._onMonthToggle(evt);
			this.displayMonth.setMonth(dojo.attr(evt.target, "month"));
			this._populateGrid();
		},

		_onDayClick: function(/*Event*/ evt){
			// summary:
			//      Handler for day clicks, selects the date if appropriate
			// tags:
			//      protected
			dojo.stopEvent(evt);
			for(var node = evt.target; node && !node.dijitDateValue; node = node.parentNode);
			if(node && !dojo.hasClass(node, "dijitCalendarDisabledDate")){
				this.set('value', node.dijitDateValue);
				this.onValueSelected(this.get('value'));
			}
		},

		_onDayMouseOver: function(/*Event*/ evt){
			// summary:
			//      Handler for mouse over events on days, sets hovered style
			// tags:
			//      protected

			// event can occur on <td> or the <span> inside the td,
			// set node to the <td>.
			var node =
				dojo.hasClass(evt.target, "dijitCalendarDateLabel") ?
				evt.target.parentNode :
				evt.target;

			if(node && (node.dijitDateValue || node == this.previousYearLabelNode || node == this.nextYearLabelNode) ){
				dojo.addClass(node, "dijitCalendarHoveredDate");
				this._currentNode = node;
			}
		},

		_onDayMouseOut: function(/*Event*/ evt){
			// summary:
			//      Handler for mouse out events on days, clears hovered style
			// tags:
			//      protected
	
			if(!this._currentNode){ return; }
			
			// if mouse out occurs moving from <td> to <span> inside <td>, ignore it
			if(evt.relatedTarget && evt.relatedTarget.parentNode == this._currentNode){ return; }

			dojo.removeClass(this._currentNode, "dijitCalendarHoveredDate");
			if(dojo.hasClass(this._currentNode, "dijitCalendarActiveDate")) {
				dojo.removeClass(this._currentNode, "dijitCalendarActiveDate");
			}
			this._currentNode = null;
		},
		
		_onDayMouseDown: function(/*Event*/ evt){
			var node = evt.target.parentNode;
			if(node && node.dijitDateValue){
				dojo.addClass(node, "dijitCalendarActiveDate");
				this._currentNode = node;
			}
		},
		
		_onDayMouseUp: function(/*Event*/ evt){
			var node = evt.target.parentNode;
			if(node && node.dijitDateValue){
				dojo.removeClass(node, "dijitCalendarActiveDate");
			}
		},

//TODO: use typematic
//TODO: skip disabled dates without ending up in a loop
//TODO: could optimize by avoiding populate grid when month does not change
		_onKeyPress: function(/*Event*/evt){
			// summary:
			//		Provides keyboard navigation of calendar
			// tags:
			//		protected
			var dk = dojo.keys,
				increment = -1,
				interval,
				newValue = this.value;
			switch(evt.keyCode){
				case dk.RIGHT_ARROW:
					increment = 1;
					//fallthrough...
				case dk.LEFT_ARROW:
					interval = "day";
					if(!this.isLeftToRight()){ increment *= -1; }
					break;
				case dk.DOWN_ARROW:
					increment = 1;
					//fallthrough...
				case dk.UP_ARROW:
					interval = "week";
					break;
				case dk.PAGE_DOWN:
					increment = 1;
					//fallthrough...
				case dk.PAGE_UP:
					interval = evt.ctrlKey ? "year" : "month";
					break;
				case dk.END:
					// go to the next month
					newValue = this.dateFuncObj.add(newValue, "month", 1);
					// subtract a day from the result when we're done
					interval = "day";
					//fallthrough...
				case dk.HOME:
					newValue = new Date(newValue).setDate(1);
					break;
				case dk.ENTER:
					this.onValueSelected(this.get('value'));
					break;
				case dk.ESCAPE:
					//TODO
				default:
					return;
			}
			dojo.stopEvent(evt);

			if(interval){
				newValue = this.dateFuncObj.add(newValue, interval, increment);
			}

			this.set("value", newValue);
		},

		onValueSelected: function(/*Date*/ date){
			// summary:
			//		Notification that a date cell was selected.  It may be the same as the previous value.
			// description:
			//      Used by `dijit.form._DateTimeTextBox` (and thus `dijit.form.DateTextBox`)
			//      to get notification when the user has clicked a date.
			// tags:
			//      protected
		},

		onChange: function(/*Date*/ date){
			// summary:
			//		Called only when the selected date has changed
		},

		_isSelectedDate: function(/*Date*/ dateObject, /*String?*/ locale){
			// summary:
			//		Extension point so developers can subclass Calendar to
			//		support multiple (concurrently) selected dates
			// tags:
			//		protected extension
			return !this.dateFuncObj.compare(dateObject, this.value, "date")
		},

		isDisabledDate: function(/*Date*/ dateObject, /*String?*/ locale){
			// summary:
			//		May be overridden to disable certain dates in the calendar e.g. `isDisabledDate=dojo.date.locale.isWeekend`
			// tags:
			//      extension
/*=====
			return false; // Boolean
=====*/
		},

		getClassForDate: function(/*Date*/ dateObject, /*String?*/ locale){
			// summary:
			//		May be overridden to return CSS classes to associate with the date entry for the given dateObject,
			//		for example to indicate a holiday in specified locale.
			// tags:
			//      extension

/*=====
			return ""; // String
=====*/
		}
	}
);
