// Override the existing function in the YUI core code
//  original is contained in calendar.js, aka calendar-min.js

/**
* Renders the calendar header.
* @method renderHeader
* @param {Array}	html	The current working HTML array
* @return {Array} The current working HTML array
*/
YAHOO.widget.Calendar.prototype.renderHeader = function(html) {
	var colSpan = 7;
	
	var DEPR_NAV_LEFT = "http://www.amtrak.com/itd/project/scripts/en/amtrak/us/tr/callt.gif";
	var DEPR_NAV_RIGHT = "http://www.amtrak.com/itd/project/scripts/en/amtrak/us/tr/calrt.gif";	
	var defCfg = YAHOO.widget.Calendar._DEFAULT_CONFIG;
	
	if (this.cfg.getProperty(defCfg.SHOW_WEEK_HEADER.key)) {
		colSpan += 1;
	}

	if (this.cfg.getProperty(defCfg.SHOW_WEEK_FOOTER.key)) {
		colSpan += 1;
	}

	html[html.length] = "<thead>";
	html[html.length] =		"<tr>";
	html[html.length] =			'<th colspan="' + colSpan + '" class="' + this.Style.CSS_HEADER_TEXT + '">';
	html[html.length] =				'<div class="' + this.Style.CSS_HEADER + '">';

	var renderLeft, renderRight = false;

	if (this.parent) {
		if (this.index === 0) {
			renderLeft = true;
		}
		if (this.index == (this.parent.cfg.getProperty("pages") -1)) {
			renderRight = true;
		}
	} else {
		renderLeft = true;
		renderRight = true;
	}

	// set renderLeft
	renderLeft = !this.isDateOOB( YAHOO.widget.DateMath.subtract( this.cfg.getProperty(defCfg.PAGEDATE.key), YAHOO.widget.DateMath.DAY, 1 ) );
	
	// set renderRight
	renderRight = !this.isDateOOB( YAHOO.widget.DateMath.add( YAHOO.widget.DateMath.findMonthEnd(this.cfg.getProperty(defCfg.PAGEDATE.key)), YAHOO.widget.DateMath.DAY, 1 ) );
	
	var cal = this.parent || this;
	
	if (renderLeft) {
		var leftArrow = this.cfg.getProperty(defCfg.NAV_ARROW_LEFT.key);
		// Check for deprecated customization - If someone set IMG_ROOT, but didn't set NAV_ARROW_LEFT, then set NAV_ARROW_LEFT to the old deprecated value
		if (leftArrow === null && YAHOO.widget.Calendar.IMG_ROOT !== null) {
			leftArrow = YAHOO.widget.Calendar.IMG_ROOT + DEPR_NAV_LEFT;
		}
		var leftStyle = (leftArrow === null) ? "" : ' style="background-image:url(' + leftArrow + ')"';
		html[html.length] = '<a class="' + this.Style.CSS_NAV_LEFT + '"' + leftStyle + ' >&#160;</a>';
	}
	
	html[html.length] = this.buildMonthLabel();
	
	if (renderRight) {
		var rightArrow = this.cfg.getProperty(defCfg.NAV_ARROW_RIGHT.key);
		if (rightArrow === null && YAHOO.widget.Calendar.IMG_ROOT !== null) {
			rightArrow = YAHOO.widget.Calendar.IMG_ROOT + DEPR_NAV_RIGHT;
		}
		var rightStyle = (rightArrow === null) ? "" : ' style="background-image:url(' + rightArrow + ')"';
		html[html.length] = '<a class="' + this.Style.CSS_NAV_RIGHT + '"' + rightStyle + ' >&#160;</a>';
	}

	html[html.length] =	'</div>\n</th>\n</tr>';

	if (this.cfg.getProperty(defCfg.SHOW_WEEKDAYS.key)) {
		html = this.buildWeekdays(html);
	}
	
	html[html.length] = '</thead>';

	return html;
};




// Pre-selects on the calendar, the date currently visible on the page
// a global month names array
var gsMonthNames = new Array(
'January',
'February',
'March',
'April',
'May',
'June',
'July',
'August',
'September',
'October',
'November',
'December'
);

var gsMonthNamesAbbr = new Array(
'Jan',
'Feb',
'Mar',
'Apr',
'May',
'Jun',
'Jul',
'Aug',
'Sep',
'Oct',
'Nov',
'Dec'
);

// a global day names array
var gsDayNames = new Array(
'Sunday',
'Monday',
'Tuesday',
'Wednesday',
'Thursday',
'Friday',
'Saturday'
);

// the date format prototype
function formatDate(d)
{
    var day = gsDayNames[d.getDay()].substr(0, 3);
    var month = gsMonthNames[d.getMonth()].substr(0, 3);
    
    var date = d.getDate();
    if (date < 10) {
      date = "0" + date;
    }
    
    return day + ", " + month + " " + date + ", " + d.getFullYear();
}

function calShow() {
	// Grab the date so we can check if day value is greater than 20
	var dateOnPage = getValidatedDateArray(this.itdIdLink);

    if (isValidDate(dateOnPage)) {
        dateOnPageObj = new Date(dateOnPage[0], (dateOnPage[1]-1), dateOnPage[2]);
    }
    else {
        dateOnPageObj = new Date();
    } 


	var itd_cal = this;
	// if date is 20th or later
    if (dateOnPageObj.getDate() > 20) {
    	// a calendarGroup is required
    	// check what we already have
        if (itd_cal.pages == null) {
        	// we need to generate a calendarGroup
        	itd_cal = generateNewCalendar(itd_cal, dateOnPageObj);
        }
    } else {
    	// a calendar is required
    	// check what we have already
        if (itd_cal.pages != null) {
        	// we need to generate a calendar
        	itd_cal = generateNewCalendar(itd_cal, dateOnPageObj);
        }
    }

	// Select in the calendar, the date currently showing on the page.
	itd_cal.select(dateOnPageObj);

	// Show the 'page' (calendar month) for the date just selected.
	itd_cal.cfg.setProperty("pagedate", dateOnPageObj);

    // AIBE-1479 Set the return trip button
    if (this.itdIdLink == 2) {
       // setTripTypeIfReturnDateSelected(false);
    } 
    itd_cal.render();
	itd_cal.show();
}


function generateNewCalendar(itd_cal, dateOnPageObj) {
	var containerID = "calContainer"+itd_cal.itdIdLink;

	// Clear the container contents
	document.getElementById(containerID).innerHTML = "";

	// NB: this must remain above the if/else statement 
	//  as itd_cal is modified within that statement
	var itdUniqueId = itd_cal.itdIdLink;

	var original_min_date = itd_cal.cfg.getProperty("mindate");
	var original_max_date = itd_cal.cfg.getProperty("maxdate");
	// remove existing event listeners
	YAHOO.util.Event.removeListener("wdfdate"+itdUniqueId);
	YAHOO.util.Event.removeListener("calLink"+itdUniqueId);
	itd_cal.selectEvent.unsubscribe(handleSelect, itd_cal);
	
    if (dateOnPageObj.getDate() > 20) {
    	itd_cal = new YAHOO.widget.CalendarGroup(itd_cal.id, containerID, "{PAGES:2}");
    } else {
    	itd_cal = new YAHOO.widget.Calendar(itd_cal.id, containerID);
    }

	// configure the calendar (also adds event listeners)
	calConfig(itdUniqueId, itd_cal, original_min_date, original_max_date);
	
	return itd_cal;
}


/**
 * called when a date is selected through the calendar
 * type: 'select'
 * args: e.g. '2007,12,22'
 * obj:  'CalendarGroup itd_cal1'
*/
function handleSelectOld(type,args,obj) {
    var dates = args[0];
    alert(dates);
    var date = dates[0];
    alert(date);
    var year = parseInt(date[0],10), month = parseInt(date[1],10), day = parseInt(date[2],10);
    setDate(this.itdIdLink,year,month,day);
    this.hide();
    doDateChanged(parseInt(this.itdIdLink,10), returnDaysAhead);
}
/**
 * called when a date is selected through the calendar
 * type: 'select'
 * args: e.g. '2007,12,22'
 * obj:  'CalendarGroup itd_cal1'
*/
function handleSelect(type,args,obj) {
    var dates = args[0];
    var date = dates[0];
    var year = parseInt(date[0],10), month = parseInt(date[1],10), day = parseInt(date[2],10);
    var inputFieldName = getField('wdfdate',this.itdIdLink).name;
    var dateInputFormat = inputFieldName.substring(inputFieldName.lastIndexOf(".") + 1, inputFieldName.length);
    var txtDate1 = document.getElementById("wdfdate" + this.itdIdLink);
    if (dateInputFormat == "date") { // YMD
      var date = new Date(year, (month-1), day);
	  txtDate1.value = formatDate(date);
    }
    else {
	  txtDate1.value = month + "/" + day + "/" + year;
	}
	this.hide();	
    doDateChanged(parseInt(this.itdIdLink,10), returnDaysAhead);
}