var dates = function () {
	//private shorthand references to YUI utilities:
	var messageResources = new Object();
	return  {
		init: function () {
			messageResources.missingCheckInDate = "Please enter a check-in date.";
			messageResources.missingCheckOutDate = "Please enter a check-out date.";
			messageResources.invalidCheckInDate = "Your Check-in date is invalid. Please check the date.";
			messageResources.invalidCheckOutDate = "Your Check-out date is invalid. Please check the date.";
			messageResources.pastCheckInDate = "Your Check-in date cannot be less than minDate";
			messageResources.pastCheckOutDate = "Your Check-out date cannot be less than minDate";
			messageResources.futureCheckInDate = "Your Check-in date cannot be more than maxDate";
			messageResources.futureCheckOutDate = "Your Check-out date cannot be more than maxDate";
			messageResources.checkOutDateBeforeCheckInDate = "Your check-out date must be after your check-in date. Please verify your dates.";
		},

		validateDates: function(section,fromDtFldNm,toDtFldNm,formIdx) {
			var section = section ;
			var fromDateFldName = "fromDate";
			var toDateFldName = "toDate" ;
			var yud = YAHOO.util.Dom ;
			var fromDateObj = null ;
			var toDateObj = null ;
			var formIndex = formIdx+'' ;
			var dateFormatPattern = YAHOO.calendarUtil.module.getDateFormatPattern() ;
			if(fromDtFldNm != null && fromDtFldNm.length > 0){
				if(formIndex != null && formIndex.length > 0 ){
					fromDateFldName = fromDtFldNm+formIndex;
				}else{
					fromDateFldName = fromDtFldNm;
				}
			}

			if(toDtFldNm != null && toDtFldNm.length > 0){
				if(formIndex != null && formIndex.length > 0 ){
					toDateFldName = toDtFldNm+formIndex;
				}else{
					toDateFldName = toDtFldNm;
				}
			}

			fromDateObj = yud.get(fromDateFldName) ;	
			toDateObj = yud.get(toDateFldName);
			var minDate = yud.get("minDate").value ;
			var maxDate = yud.get("maxDate").value ;
			var fromDate = '';
			var toDate  = '';
			var errMessage = "" ;

			//Check-in date validation
			if(fromDateObj != null){
				fromDate = fromDateObj.value;

				//If the validation is invoked from the availability form, make sure the check in and 
				//check out dates are not empty
				if(section == "availability" || section == "futureRates" ){
					if(fromDate == null || fromDate == '' ){
						errMessage = messageResources.missingCheckInDate ;
						alert(errMessage);
						fromDateObj.focus() ;
						return false ;
					}
				}

				if(fromDate != null && fromDate.length > 0){
					//is check-in date valid? 
					if (!isDateValid(fromDate, dateFormatPattern))
					{
						errMessage = messageResources.invalidCheckInDate ;
						alert(errMessage);
						fromDateObj.focus() ;
						return false ;
					}

					//Validate that Check-in is not less than the min date
					if(isDateLessThanDate1(fromDateObj.value,formatDate(minDate,dateFormatPattern),dateFormatPattern)){
						errMessage =  messageResources.pastCheckInDate ;
						errMessage = errMessage.replace("minDate",formatDate(minDate,dateFormatPattern))
						alert(errMessage);
						fromDateObj.focus() ;
						return false;
					}
				
					//Validate that fromDate is not greater than the max date
					if(isDateGreaterThanDate1(fromDateObj.value,formatDate(maxDate,dateFormatPattern),dateFormatPattern)){
						errMessage =  messageResources.futureCheckInDate ;
						errMessage = errMessage.replace("maxDate",formatDate(maxDate,dateFormatPattern))
						alert(errMessage);
						fromDateObj.focus() ;
						return false;
					}

					//The check is made for availabilility on top already
					if(section != "availability"){
						if(toDateObj != null && (toDateObj.value == null || toDateObj.value	 == "") ){
							errMessage = messageResources.missingCheckOutDate ;
							alert(errMessage);
							toDateObj.focus() ;
							return false ;
						}
					}
				}
			}

			if(section != "futureRates"){
				//Check-out date validation
				if(toDateObj != null){
					toDate = toDateObj.value;

					if(section == "availability"){
						if(toDate == null || toDate == '' ){
							errMessage = messageResources.missingCheckOutDate ;
							alert(errMessage);
							toDateObj.focus() ;
							return false ;
						}
					}
	
					if(toDate != null && toDate.length > 0){
						//is check in date valid? 
						if (!isDateValid(toDate, dateFormatPattern))
						{
							errMessage = messageResources.invalidCheckOutDate ;
							alert(errMessage);
							toDateObj.focus() ;
							return false ;
						}

						//Validate that check-out is not less than the min date
						if(isDateLessThanDate1(toDateObj.value,datePlusOne(minDate,dateFormatPattern),dateFormatPattern)){
							errMessage =  messageResources.pastCheckOutDate ;
							errMessage = errMessage.replace("minDate",datePlusOne(minDate,dateFormatPattern))
							alert(errMessage);
							toDateObj.focus() ;
							return false;
						}

						//Validate that check-out is not greater than the max date
						if(isDateGreaterThanDate1(toDateObj.value,formatDate(maxDate,dateFormatPattern),dateFormatPattern)){
							errMessage =  messageResources.futureCheckOutDate ;
							errMessage = errMessage.replace("maxDate",formatDate(maxDate,dateFormatPattern))
							alert(errMessage);
							toDateObj.focus() ;
							return false;
						}

						if(section != "availability"){
							if(fromDateObj != null && (fromDateObj.value == null || fromDateObj.value == "") ){
								errMessage = messageResources.missingCheckInDate ;
								alert(errMessage);
								fromDateObj.focus() ;
								return false ;
							}
						}
					}
				}

				//Validate that Check-in date is before Check-out date
				if((fromDateObj != null && (fromDateObj.value != null && fromDateObj.value != "")) && 
				   (toDateObj != null && (toDateObj.value != null && toDateObj.value != ""))){
					if(isDateLessThanOrEqualToDate1(toDateObj.value,fromDateObj.value,dateFormatPattern))
					{
						errMessage = messageResources.checkOutDateBeforeCheckInDate ;
						alert(errMessage);
						toDateObj.focus() ;
						return false;
					}
				}
			}
			return true;
		},

		validateEandMDates: function(section,fromDtFldNm,toDtFldNm,formIdx) {
			var fromDateObj = null ;
			var toDateObj = null ;
			var yud = YAHOO.util.Dom ;
			var dateFormatPattern = YAHOO.calendarUtil.module.getDateFormatPattern() ;
			fromDateObj = yud.get(fromDtFldNm) ;	
			toDateObj = yud.get(toDtFldNm);
			var minDate = yud.get("minDate").value ;
			var maxDate = yud.get("maxDate").value ;
			var fromDate = '';
			var toDate  = '';
			var errMessage = "" ;

			//Check-in date validation
			if(fromDateObj != null && (fromDateObj.value != null && fromDateObj.value != "") ){
				fromDate = fromDateObj.value;
				//is Arrival date valid? 
				if (!isDateValid(fromDate, dateFormatPattern))
				{
					errMessage = "Your arrival date is invalid. Verify your date." ;
					alert(errMessage);
					return false ;
				}
				
				//Validate that Arrival is not equal to the current date
				if(isDateEqualsCurrentDate(fromDate,dateFormatPattern)){
					errMessage =  "For same-day bookings, please contact the hotel directly or call our National Group Desk directly at 1800-831-4004." ;
					alert(errMessage);
					return false;
				}

				//Validate that Arrival is not less than the min date
				if(isDateLessThanDate1(fromDate,formatDate(minDate,dateFormatPattern),dateFormatPattern)){
					errMessage =  "Your arrival date occur in the past. Verify your dates" ;
					alert(errMessage);
					return false;
				}

				//Validate that Arrival is not greater than the max date
				if(isDateGreaterThanDate1(fromDate,formatDate(maxDate,dateFormatPattern),dateFormatPattern)){
					errMessage = "Your arrival date occur in the future. Verify your dates" ;
					alert(errMessage);
					return false;
				}

				if(toDateObj.value == null || toDateObj.value == '' ){
					errMessage = "Please enter a departure date." ;
					alert(errMessage);
					return false ;
				}
			}

			//Departure date validation
			if(toDateObj != null && (toDateObj.value != null && toDateObj.value != "") ){
				toDate = toDateObj.value;
				//is Departure date valid? 
				if (!isDateValid(toDate, dateFormatPattern))
				{
					errMessage = "Your departure date is invalid. Verify your date." ;
					alert(errMessage);
					return false ;
				}

				//Validate that check-out is not less than the min date
				if(isDateLessThanDate1(toDate,datePlusOne(minDate,dateFormatPattern),dateFormatPattern)){
					errMessage = "Your departure date occurs in the past. Verify your date. ";
					alert(errMessage);
					return false;
				}

				//Validate that check-out is not greater than the max date
				if(isDateGreaterThanDate1(toDate,formatDate(maxDate,dateFormatPattern),dateFormatPattern)){
					errMessage = "Your departure date occurs in the future. Verify your date.";					
					alert(errMessage);
					return false;
				}

				if(fromDateObj.value == null || fromDateObj.value == '' ){
					errMessage = "Please enter an arrival date";
					alert(errMessage);
					return false ;
				}
			}

			//Validate that Check-in date is before Check-out date
			if((fromDateObj != null && (fromDateObj.value != null && fromDateObj.value != "")) && 
			   (toDateObj != null && (toDateObj.value != null && toDateObj.value != ""))){
				if(isDateEqualsDate1(fromDateObj.value,toDateObj.value,dateFormatPattern))
				{
					errMessage = "For same-day bookings, please contact the hotel directly or call our National Group Desk directly at 1800-831-4004. "
					alert(errMessage);
					return false;
				}else if(isDateGreaterThanDate1(fromDateObj.value,toDateObj.value,dateFormatPattern))
				{
					alert("Please enter a departure date that is after your arrival date");
					return false;
				}
			
				var daysDiff = calculateNoOfNights(new Date(fromDateObj.value), new Date(toDateObj.value));
				if (daysDiff > 10)
				{
					alert("For events lasting more than 10 nights, please contact our National Group Desk directly at 1-800-831-4004."); 
					return false;
				}
			}
			return true;
		},
		calculateNoOfNights: function (checkInDate, checkOutDate)
		{
			var daysDifference = 0;
			if (checkInDate != null && checkOutDate != null)
			{
				var difference = checkOutDate.getTime() - checkInDate.getTime();
				daysDifference = Math.floor(difference/1000/60/60/24);
			}
			return daysDifference;
		}
	};
}();

addLoadEvent(dates.init);