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/*  Copyright Mihai Bazon, 2002, 2003  |  http://dynarch.com/mishoo/
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 * ---------------------------------------------------------------------------
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 *
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 * The DHTML Calendar
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 *
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 * Details and latest version at:
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 * http://dynarch.com/mishoo/calendar.epl
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 *
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 * This script is distributed under the GNU Lesser General Public License.
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 * Read the entire license text here: http://www.gnu.org/licenses/lgpl.html
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 *
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 * This file defines helper functions for setting up the calendar.  They are
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 * intended to help non-programmers get a working calendar on their site
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 * quickly.  This script should not be seen as part of the calendar.  It just
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 * shows you what one can do with the calendar, while in the same time
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 * providing a quick and simple method for setting it up.  If you need
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 * exhaustive customization of the calendar creation process feel free to
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 * modify this code to suit your needs (this is recommended and much better
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 * than modifying calendar.js itself).
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 */
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// $Id: calendar-setup.js,v 1.25 2005/03/07 09:51:33 mishoo Exp $
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/**
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 *  This function "patches" an input field (or other element) to use a calendar
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 *  widget for date selection.
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 *
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 *  The "params" is a single object that can have the following properties:
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 *
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 *    prop. name   | description
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 *  -------------------------------------------------------------------------------------------------
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 *   inputField    | the ID of an input field to store the date
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 *   displayArea   | the ID of a DIV or other element to show the date
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 *   button        | ID of a button or other element that will trigger the calendar
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 *   eventName     | event that will trigger the calendar, without the "on" prefix (default: "click")
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 *   ifFormat      | date format that will be stored in the input field
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 *   daFormat      | the date format that will be used to display the date in displayArea
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 *   singleClick   | (true/false) wether the calendar is in single click mode or not (default: true)
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 *   firstDay      | numeric: 0 to 6.  "0" means display Sunday first, "1" means display Monday first, etc.
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 *   align         | alignment (default: "Br"); if you don't know what's this see the calendar documentation
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 *   range         | array with 2 elements.  Default: [1900, 2999] -- the range of years available
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 *   weekNumbers   | (true/false) if it's true (default) the calendar will display week numbers
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 *   flat          | null or element ID; if not null the calendar will be a flat calendar having the parent with the given ID
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 *   flatCallback  | function that receives a JS Date object and returns an URL to point the browser to (for flat calendar)
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 *   disableFunc   | function that receives a JS Date object and should return true if that date has to be disabled in the calendar
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 *   onSelect      | function that gets called when a date is selected.  You don't _have_ to supply this (the default is generally okay)
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 *   onClose       | function that gets called when the calendar is closed.  [default]
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 *   onUpdate      | function that gets called after the date is updated in the input field.  Receives a reference to the calendar.
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 *   date          | the date that the calendar will be initially displayed to
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 *   showsTime     | default: false; if true the calendar will include a time selector
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 *   timeFormat    | the time format; can be "12" or "24", default is "12"
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 *   electric      | if true (default) then given fields/date areas are updated for each move; otherwise they're updated only on close
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 *   step          | configures the step of the years in drop-down boxes; default: 2
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 *   position      | configures the calendar absolute position; default: null
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 *   cache         | if "true" (but default: "false") it will reuse the same calendar object, where possible
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 *   showOthers    | if "true" (but default: "false") it will show days from other months too
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 *
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 *  None of them is required, they all have default values.  However, if you
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 *  pass none of "inputField", "displayArea" or "button" you'll get a warning
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 *  saying "nothing to setup".
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 */
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Calendar.setup = function (params) {
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	function param_default(pname, def) { if (typeof params[pname] == "undefined") { params[pname] = def; } };
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	param_default("inputField",     null);
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	param_default("displayArea",    null);
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	param_default("button",         null);
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	param_default("eventName",      "click");
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	param_default("ifFormat",       "%Y/%m/%d");
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	param_default("daFormat",       "%Y/%m/%d");
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	param_default("singleClick",    true);
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	param_default("disableFunc",    null);
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	param_default("dateStatusFunc", params["disableFunc"]);	// takes precedence if both are defined
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	param_default("dateText",       null);
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	param_default("firstDay",       null);
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	param_default("align",          "Br");
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	param_default("range",          [1900, 2999]);
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	param_default("weekNumbers",    true);
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	param_default("flat",           null);
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	param_default("flatCallback",   null);
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	param_default("onSelect",       null);
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	param_default("onClose",        null);
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	param_default("onUpdate",       null);
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	param_default("date",           null);
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	param_default("showsTime",      false);
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	param_default("timeFormat",     "24");
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	param_default("electric",       true);
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	param_default("step",           2);
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	param_default("position",       null);
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	param_default("cache",          false);
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	param_default("showOthers",     false);
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	param_default("multiple",       null);
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	var tmp = ["inputField", "displayArea", "button"];
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	for (var i in tmp) {
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		if (typeof params[tmp[i]] == "string") {
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			params[tmp[i]] = document.getElementById(params[tmp[i]]);
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		}
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	}
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	if (!(params.flat || params.multiple || params.inputField || params.displayArea || params.button)) {
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		alert("Calendar.setup:\n  Nothing to setup (no fields found).  Please check your code");
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		return false;
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	}
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	function onSelect(cal) {
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		var p = cal.params;
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		var update = (cal.dateClicked || p.electric);
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		if (update && p.inputField) {
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			p.inputField.value = cal.date.print(p.ifFormat);
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			if (typeof p.inputField.onchange == "function")
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				p.inputField.onchange();
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		}
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		if (update && p.displayArea)
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			p.displayArea.innerHTML = cal.date.print(p.daFormat);
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		if (update && typeof p.onUpdate == "function")
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			p.onUpdate(cal);
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		if (update && p.flat) {
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			if (typeof p.flatCallback == "function")
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				p.flatCallback(cal);
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		}
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		if (update && p.singleClick && cal.dateClicked)
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			cal.callCloseHandler();
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	};
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	if (params.flat != null) {
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		if (typeof params.flat == "string")
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			params.flat = document.getElementById(params.flat);
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		if (!params.flat) {
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			alert("Calendar.setup:\n  Flat specified but can't find parent.");
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			return false;
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		}
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		var cal = new Calendar(params.firstDay, params.date, params.onSelect || onSelect);
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		cal.showsOtherMonths = params.showOthers;
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		cal.showsTime = params.showsTime;
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		cal.time24 = (params.timeFormat == "24");
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		cal.params = params;
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		cal.weekNumbers = params.weekNumbers;
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		cal.setRange(params.range[0], params.range[1]);
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		cal.setDateStatusHandler(params.dateStatusFunc);
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		cal.getDateText = params.dateText;
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		if (params.ifFormat) {
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			cal.setDateFormat(params.ifFormat);
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		}
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		if (params.inputField && typeof params.inputField.value == "string") {
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			cal.parseDate(params.inputField.value);
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		}
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		cal.create(params.flat);
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		cal.show();
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		return false;
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	}
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	var triggerEl = params.button || params.displayArea || params.inputField;
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	triggerEl["on" + params.eventName] = function() {
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		var dateEl = params.inputField || params.displayArea;
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		var dateFmt = params.inputField ? params.ifFormat : params.daFormat;
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		var mustCreate = false;
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		var cal = window.calendar;
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//		if (dateEl)
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//			params.date = Date.parseDate(dateEl.value || dateEl.innerHTML, dateFmt);
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//by nib: checks wether inputfield is empty or not. orig code only checked wether inputfield exists, so param.date was never read!
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if (dateEl.value.replace(/^\s+|\s+$/g,"").length != 0 || dateEl.innerHTML.replace(/^\s+|\s+$/g,"").length != 0)
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params.date = Date.parseDate(dateEl.value || dateEl.innerHTML, dateFmt);
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		if (!(cal && params.cache)) {
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			window.calendar = cal = new Calendar(params.firstDay,
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							     params.date,
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							     params.onSelect || onSelect,
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							     params.onClose || function(cal) { cal.hide(); });
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			cal.showsTime = params.showsTime;
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			cal.time24 = (params.timeFormat == "24");
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			cal.weekNumbers = params.weekNumbers;
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			mustCreate = true;
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		} else {
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			if (params.date)
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				cal.setDate(params.date);
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			cal.hide();
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		}
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		if (params.multiple) {
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			cal.multiple = {};
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			for (var i = params.multiple.length; --i >= 0;) {
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				var d = params.multiple[i];
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				var ds = d.print("%Y%m%d");
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				cal.multiple[ds] = d;
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			}
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		}
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		cal.showsOtherMonths = params.showOthers;
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		cal.yearStep = params.step;
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		cal.setRange(params.range[0], params.range[1]);
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		cal.params = params;
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		cal.setDateStatusHandler(params.dateStatusFunc);
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		cal.getDateText = params.dateText;
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		cal.setDateFormat(dateFmt);
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		if (mustCreate)
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			cal.create();
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		cal.refresh();
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		if (!params.position)
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			cal.showAtElement(params.button || params.displayArea || params.inputField, params.align);
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		else
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			cal.showAt(params.position[0], params.position[1]);
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		return false;
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	};
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	return cal;
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};
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