var elementsCalendar = Class.create();
elementsCalendar.prototype = {

	initialize: function(options) {
		this.params = new Object();

		this.param_default("inputField", null);
		this.param_default("displayArea", null);
		this.param_default("button", null);
		this.param_default("eventName", "click");
		this.param_default("ifFormat", "%Y/%m/%d");
		this.param_default("daFormat", "%Y/%m/%d");
		this.param_default("singleClick", true);
		this.param_default("disableFunc", null);
		this.param_default("dateStatusFunc", this.params["disableFunc"]);
		this.param_default("firstDay", 0);
		this.param_default("align", "Br");
		this.param_default("range", [1900, 2999]);
		this.param_default("weekNumbers", true);
		this.param_default("flat", null);
		this.param_default("flatCallback", null);
		this.param_default("onSelect", null);
		this.param_default("onClose", null);
		this.param_default("onUpdate", null);
		this.param_default("date", null);
		this.param_default("showsTime", false);
		this.param_default("timeFormat", "24");
		this.param_default("electric", true);
		this.param_default("step", 2);
		this.param_default("position", null);
		this.param_default("cache", false);
		this.param_default("showOthers", false);


		this.options = options;
		this.calendar = new Calendar(1, new Date(), this.dateChanged.bind(this), this.closeCalendar.bind(this));
		this.calendar.showsTime = this.params.showsTime;
		this.calendar.time24 = "24";
		this.calendar.params = this.params;
		this.calendar.weekNumbers = false;
		this.calendar.setRange(new Date().getFullYear(), 2999);
		this.calendar.setDateStatusHandler(null);
		this.calendar.yearStep = this.params['step'];

		$(this.options.button).onclick = this.showCalendar.bind(this);

		if (this.options.updateFieldOnStartup != false) {
			this.updateDateField(new Date());
		}
	},


	param_default : function (pname, def) {
		if (typeof this.params[pname] == "undefined") {
			this.params[pname] = def;
		}
	},

	showCalendar : function () {
		this.calendar.create();
		/*this.calendar.refresh();*/
		this.calendar.showAtElement($(this.options.button), "Br");
	},

	closeCalendar : function () {
		calendar.hide();
	},

	dateChanged : function (calendar) {
		if (calendar.dateClicked) {
			this.updateDateField(calendar.date);
			calendar.hide();
		}
	},

	updateDateField : function (date) {
		if (this.options.output == "select") {
			this.updateSelectBoxes(date);
		}
		else if (this.options.output == "text") {
			this.updateTextField(date);
		}
		else {
			this.updateInputFields(date);
		}
	},

	updateInputFields : function (date) {
		$(this.options.dayInput).value = date.getDate();
		$(this.options.monthInput).value = parseInt(date.getMonth() + 1);
		$(this.options.yearInput).value = date.getFullYear();
		try {
			if (typeof offerSelection != 'undefined') {
				$('overlay').show();
				offerSelection.submitAjax();
			}
		}
		catch (e) {
		}

	},

	updateTextField : function (date) {
		$(this.options.textfield).innerHTML = date.getDate() + "." + parseInt(date.getMonth() + 1) + "." + date.getFullYear();
	},

	updateSelectBoxes : function (date) {

		var dayoptions = document.getElementById(this.options.daySelect).getElementsByTagName('option');
		for (var i = 0; i < dayoptions.length; i++) {
			if (dayoptions[i].value == date.getDate()) {
				dayoptions[i].selected = true;
			}
			else {
				dayoptions[i].selected = false;
			}
		}

		var monthoptions = document.getElementById(this.options.monthSelect).getElementsByTagName('option');
		for (var i = 0; i < monthoptions.length; i++) {
			if (parseInt(monthoptions[i].value) == parseInt(date.getMonth() + 1)) {
				monthoptions[i].selected = true;
			}
			else {
				monthoptions[i].selected = false;
			}
		}

		var yearoptions = document.getElementById(this.options.yearSelect).getElementsByTagName('option');
		for (var i = 0; i < yearoptions.length; i++) {
			if (yearoptions[i].value == date.getFullYear()) {
				yearoptions[i].selected = true;
			}
			else {
				yearoptions[i].selected = false;
			}
		}

	}

}