// From http://nik.chankov.net/2007/09/13/advanced-datepicker-helper-for-cakephp/

var oldLink = null;
function setActiveStyleSheet( link, title )
{
	var i, a, main;

	for( i=0; ( a = document.getElementsByTagName( "link" )[i] ); i++ )
	{
		if( a.getAttribute( "rel" ).indexOf( "style" ) != -1 && a.getAttribute( "title" ) )
		{
			a.disabled = true;
			if( a.getAttribute( "title" ) == title ) a.disabled = false;
		}
	}
	if ( oldLink ) oldLink.style.fontWeight = 'normal';

	oldLink = link;
	link.style.fontWeight = 'bold';
	return false;
}
// This function gets called when the end-user clicks on some date.
function selected( cal, date )
{
	cal.sel.value = date; // just update the date in the input field.

	if ( cal.dateClicked && ( cal.sel.id == "sel1" || cal.sel.id == "sel3" ) )
	{
		// if we add this call we close the calendar on single-click.
		// just to exemplify both cases, we are using this only for the 1st
		// and the 3rd field, while 2nd and 4th will still require double-click.
		cal.callCloseHandler();
	}
}

// And this gets called when the end-user clicks on the _selected_ date,
// or clicks on the "Close" button. It just hides the calendar without
// destroying it.
function closeHandler( cal )
{
	cal.hide(); // hide the calendar
//	cal.destroy();
	_dynarch_popupCalendar = null;
}

// This function shows the calendar under the element having the given id.
// It takes care of catching "mousedown" signals on document and hiding the
// calendar if the click was outside.
function showCalendar( id, format, showsTime, showsOtherMonths )
{
	var el = document.getElementById( id );

	if( _dynarch_popupCalendar != null )
	{
		// we already have some calendar created
		_dynarch_popupCalendar.hide(); // so we hide it first.
	}
	else
	{
		// first-time call, create the calendar.
		var cal = new Calendar( 1, null, selected, closeHandler );

		// uncomment the following line to hide the week numbers
		// cal.weekNumbers = false;

		if( typeof showsTime == "string" )
		{
			cal.showsTime = true;
			cal.time24 = ( showsTime == "24" );
		}
		if( showsOtherMonths )
		{
			cal.showsOtherMonths = true;
		}
		_dynarch_popupCalendar = cal; // remember it in the global var
		cal.setRange( 1900, 2070 ); // min/max year allowed.
		cal.create();
	}
	_dynarch_popupCalendar.setDateFormat( format ); // set the specified date format
	_dynarch_popupCalendar.parseDate( el.value ); // try to parse the text in field
	_dynarch_popupCalendar.sel = el; // inform it what input field we use

	// the reference element that we pass to showAtElement is the button that
	// triggers the calendar. In this example we align the calendar bottom-right
	// to the button.
	_dynarch_popupCalendar.showAtElement( el.nextSibling, "Br" ); // show the calendar

	return false;
}

var MINUTE = 60 * 1000;
var HOUR = 60 * MINUTE;
var DAY = 24 * HOUR;
var WEEK = 7 * DAY;

// If this handler returns true then the "date" given as
// parameter will be disabled. In this example we enable
// only days within a range of 10 days from the current
// date.
// You can use the functions date.getFullYear() -- returns the year
// as 4 digit number, date.getMonth() -- returns the month as 0..11,
// and date.getDate() -- returns the date of the month as 1..31, to
// make heavy calculations here. However, beware that this function
// should be very fast, as it is called for each day in a month when
// the calendar is ( re )constructed.
function isDisabled( date )
{
	var today = new Date();
	return ( Math.abs( date.getTime() - today.getTime() ) / DAY ) > 10;
}

function showFlatCalendar( id, holder, format, selectedHandler )
{
	var prnt = document.getElementById( holder );
	var element = document.getElementById( id );

	// construct a calendar giving only the "selected" handler.
	var cal = new Calendar( 0, null, selectedHandler );

	// hide week numbers
	cal.setDateFormat( format );
	cal.weekNumbers = false;
	cal.create( prnt );
	cal.parseDate( element.value );
	cal.show();
}