/*  Copyright Mihai Bazon, 2002, 2003  |  http://dynarch.com/mishoo/
 * ---------------------------------------------------------------------------
 *
 * The DHTML Calendar
 *
 * Details and latest version at:
 * http://dynarch.com/mishoo/calendar.epl
 *
 * This script is distributed under the GNU Lesser General Public License.
 * Read the entire license text here: http://www.gnu.org/licenses/lgpl.html
 *
 * This file defines helper functions for setting up the calendar.  They are
 * intended to help non-programmers get a working calendar on their site
 * quickly.  This script should not be seen as part of the calendar.  It just
 * shows you what one can do with the calendar, while in the same time
 * providing a quick and simple method for setting it up.  If you need
 * exhaustive customization of the calendar creation process feel free to
 * modify this code to suit your needs (this is recommended and much better
 * than modifying calendar.js itself).
 */
Calendar.setup=function(params){
	function param_default(pname,def) {
 		if(typeof params[pname]=="undefined") {
			params[pname]=def;
		}
	};
	param_default("inputField",null);
	param_default("displayArea",null);
	param_default("button",null);
	param_default("eventName","click");
	param_default("ifFormat","%Y/%m/%d");
	param_default("daFormat","%Y/%m/%d");
	param_default("singleClick",true);
	param_default("disableFunc",null);
	param_default("dateStatusFunc",params["disableFunc"]);
	param_default("firstDay",1);
	param_default("align","Br");
	param_default("range",[1900,2999]);
	param_default("weekNumbers",true);
	param_default("flat",null);
	param_default("flatCallback",null);
	param_default("onSelect",null);
	param_default("onClose",null);
	param_default("onUpdate",null);
	param_default("date",null);
	param_default("showsTime",false);
	param_default("timeFormat","24");
	param_default("electric",true);
	param_default("step",2);
	param_default("position",null);
	param_default("cache",false);
	param_default("showOthers",false);

	var tmp = ["inputField", "displayArea", "button"];
	for (var i in tmp) {
		if (typeof params[tmp[i]] == "string") {
			params[tmp[i]] = document.getElementById(params[tmp[i]]);
		}
	}
	if (!(params.flat||params.inputField||params.displayArea||params.button)) {
		alert("Calendar.setup:\n  Nothing to setup (no fields found).  Please check your code");
		return false;
	}

	function onSelect(cal) {
		var p = cal.params;
		var update = (cal.dateClicked||p.electric);
		if (update && p.flat) {
			if (typeof p.flatCallback == "function")
				p.flatCallback(cal);
			else 
				alert("No flatCallback given -- doing nothing.");
			return false;
		}
		if (update && p.inputField) {
			p.inputField.value = cal.date.print(p.ifFormat);
			if(typeof p.inputField.onchange=="function") p.inputField.onchange();
		}
		if (update&&p.displayArea) p.displayArea.innerHTML=cal.date.print(p.daFormat);
		if (update&&p.singleClick&&cal.dateClicked) cal.callCloseHandler();
		if (update&&typeof p.onUpdate=="function") p.onUpdate(cal);
	};
	if (params.flat!=null) {
		if (typeof params.flat=="string") params.flat=document.getElementById(params.flat);
		if (!params.flat) {
			alert("Calendar.setup:\n  Flat specified but can't find parent.");
			return false;
		}
		var cal=new Calendar(params.firstDay,params.date,params.onSelect||onSelect);
		cal.showsTime=params.showsTime;
		cal.time24=(params.timeFormat=="24");
		cal.params=params;
		cal.weekNumbers=params.weekNumbers;
		cal.setRange(params.range[0],params.range[1]);
		cal.setDateStatusHandler(params.dateStatusFunc);
		cal.create(params.flat);
		cal.show();
		return false;
	}
	var triggerEl=params.button||params.displayArea||params.inputField;

	triggerEl["on"+params.eventName]=function() {
		var dateEl=params.inputField||params.displayArea;
		var dateFmt=params.inputField?params.ifFormat:params.daFormat;
		var mustCreate=false;
		var cal=window.calendar;
		if(!(cal&&params.cache)) {
			window.calendar=cal=new Calendar(params.firstDay,params.date,params.onSelect||onSelect,params.onClose|| function (cal) {
				cal.hide();
			});
			cal.showsTime=params.showsTime;
			cal.time24=(params.timeFormat=="24");
			cal.weekNumbers=params.weekNumbers;
			mustCreate=true;
		} else {
			if (params.date) cal.setDate(params.date);
			cal.hide();
		}
		cal.showsOtherMonths=params.showOthers;
		cal.yearStep=params.step;
		cal.setRange(params.range[0],params.range[1]);
		cal.params=params;
		cal.setDateStatusHandler(params.dateStatusFunc);
		cal.setDateFormat(dateFmt);
		if (mustCreate) cal.create();
		cal.parseDate(dateEl.value||dateEl.innerHTML);
		cal.refresh();
		if (!params.position) cal.showAtElement(params.button||params.displayArea||params.inputField,params.align);
		else cal.showAt(params.position[0],params.position[1]);
		return false;
	};
};