/*  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 1.25 2005/03/07 09:51:33 mishoo 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
*
*  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("dateText", null);
	param_default("firstDay", null);
	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);
	param_default("multiple", null);

	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.multiple || 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.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 && typeof p.onUpdate == "function")
			p.onUpdate(cal);
		if (update && p.flat) {
			if (typeof p.flatCallback == "function")
				p.flatCallback(cal);
		}
		if (update && p.singleClick && cal.dateClicked)
			cal.callCloseHandler();
	};

	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.showsOtherMonths = params.showOthers;
		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.getDateText = params.dateText;
		if (params.ifFormat) {
			cal.setDateFormat(params.ifFormat);
		}
		if (params.inputField && typeof params.inputField.value == "string") {
			cal.parseDate(params.inputField.value);
		}
		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 (dateEl)
			params.date = Date.parseDate(dateEl.value || dateEl.innerHTML, dateFmt);
		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();
		}
		if (params.multiple) {
			cal.multiple = {};
			for (var i = params.multiple.length; --i >= 0; ) {
				var d = params.multiple[i];
				var ds = d.print("%Y%m%d");
				cal.multiple[ds] = d;
			}
		}
		cal.showsOtherMonths = params.showOthers;
		cal.yearStep = params.step;
		cal.setRange(params.range[0], params.range[1]);
		cal.params = params;
		cal.setDateStatusHandler(params.dateStatusFunc);
		cal.getDateText = params.dateText;
		cal.setDateFormat(dateFmt);
		if (mustCreate)
			cal.create();
		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;
	};

	return cal;
};