/*	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).
 */

// $Id: calendar-setup.js,v 1.3.2.1 2011/07/29 11:49:51 TD.Admin Exp $

/**
 *	This function "patches" an input field (or other element) to use a calendar
 *	widget for date selection.
 *
 *	The "params" is a single object that can have the following properties:
 *
 *	prop. name	| description
 *	-------------------------------------------------------------------------------------------------
 *	inputField	| the ID of an input field to store the date
 *	displayArea	| the ID of a DIV or other element to show the date
 *	button		| ID of a button or other element that will trigger the calendar
 *	eventName	 | event that will trigger the calendar, without the "on" prefix (default: "click")
 *	ifFormat		| date format that will be stored in the input field
 *	daFormat		| the date format that will be used to display the date in displayArea
 *	singleClick	| (true/false) wether the calendar is in single click mode or not (default: true)
 *	firstDay		| numeric: 0 to 6.	"0" means display Sunday first, "1" means display Monday first, etc.
 *	align		 | alignment (default: "Br"); if you don't know what's this see the calendar documentation
 *	range		 | array with 2 elements.	Default: [1900, 2999] -- the range of years available
 *	weekNumbers	| (true/false) if it's true (default) the calendar will display week numbers
 *	flat			| null or element ID; if not null the calendar will be a flat calendar having the parent with the given ID
 *	flatCallback	| function that receives a JS Date object and returns an URL to point the browser to (for flat calendar)
 *	disableFunc	| function that receives a JS Date object and should return true if that date has to be disabled in the calendar
 *	onSelect		| function that gets called when a date is selected.	You don't _have_ to supply this (the default is generally okay)
 *	onClose		| function that gets called when the calendar is closed.	[default]
 *	onUpdate		| function that gets called after the date is updated in the input field.	Receives a reference to the calendar.
 *	date			| the date that the calendar will be initially displayed to
 *	showsTime	 | default: false; if true the calendar will include a time selector
 *	timeFormat	| the time format; can be "12" or "24", default is "12"
 *	electric		| if true (default) then given fields/date areas are updated for each move; otherwise they're updated only on close
 *	step			| configures the step of the years in drop-down boxes; default: 2
 *	position		| configures the calendar absolute position; default: null
 *	cache		 | if "true" (but default: "false") it will reuse the same calendar object, where possible
 *	showOthers	| if "true" (but default: "false") it will show days from other months too
 *	todaysDate	| default: browser's date; this allows you to set the value of "today" manually. -dain
 *
 *	None of them is required, they all have default values.	However, if you
 *	pass none of "inputField", "displayArea" or "button" you'll get a warning
 *	saying "nothing to setup".
 */
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"]);	// takes precedence if both are defined
	param_default("firstDay",		0); // defaults to "Sunday" first
	param_default("align",			"Br");
	param_default("range",			[1930, 2029]);
	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);
	param_default("todaysDate",	 null); // added -dain

	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;
			cal.today = params.todaysDate; // added -dain
			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;
	};
};