/*
* $Author:   woodwarm  $
* $Revision:   1.1  $
* $Date:   Mar 02 2003 17:04:06  $
*/
// Start Renderer JavaScript functions //

function validateTime(time) {
	tmpStr = new String(time);

	var hours=0;
	var minutes=0;
	var returnString="";

	// if special word "now"
	if (tmpStr.toLowerCase().indexOf("now") != -1)
	{
		// parse a todays Date object
		var todaysTime = new Date();
		hours	= todaysTime.getHours();
		minutes = todaysTime.getMinutes();
	}
	else // just a normal time has been entered
	{
		if (tmpStr.indexOf("pm") != -1) {	hours=12;	}

		// strip out any non numeric chars.
		stripNonNum = /(\D)/g;
		replaceWith = "";
		tmpStr = tmpStr.replace(stripNonNum,replaceWith);	
		if (tmpStr.length > 4)	{	tmpStr = tmpStr.substr(0,4);	}

		hours	+= parseInt((tmpStr.substr(0,tmpStr.length-2)));
		minutes  = parseInt(tmpStr.substr(tmpStr.length-2,tmpStr.length));	
		
/*		checked for validate date and time entered, now will just show an error symbol instead
		// if mins > 60, then convert to appropriate hour value and min value
		if (minutes>=60) { 
			tmpMinStr = new String(minutes/60);
			splitString = new Array();
			splitString = tmpMinStr.split(".",2);  // split on the '.'

			minutes = parseInt(minutes%60);  
			hours+= parseInt(splitString[0]); 
		}
		if (hours>=24) { hours-=24;	}
*/
	}
	// if valid, then return time, else throw error.
	if (hours>=0 && hours <=23 && minutes>=0 && minutes <= 59) {
		// pad out with a preceding 0 if needed.
		returnString = LZ(hours)+":"+LZ(minutes);
		return returnString;
	} else {
		return 0;
	}	
}

// ------------------------------------------------------------------
// allowDefinedChars(String allowedChars)
//
// Validates and formats a NINO number.
// Returns a validated and formatted NINO string in the format,
// AA NN NN NN A..D
// Author: DP. 10/02/2003
// ------------------------------------------------------------------
function allowDefinedChars(allowedChars) {
	event.returnValue = ( allowedChars.indexOf(String.fromCharCode(event.keyCode)) >= 0 );
}

function validateFieldValue(value,fieldName,fieldType,formName)
{
	var returnValue;

	if (fieldType == "date")
	{
		// if an error
		if (validateDate(value) == 0 && value != '') { 
			MM_swapImage(fieldName,'','images/error.gif',0); 
			formName.elements[fieldName].title='Date invalid, enter date in format dd/mm/yyyy';
			returnValue = value;
		} 
		else 
		{ 
			MM_swapImage(fieldName,'','images/spacer.gif',0);
			formName.elements[fieldName].title='';
			returnValue = formatDate(validateDate(value),'dd/MM/yyyy');
		}
	}
	else if (fieldType == "dob")
	{
		// if an error
		if (validateDate(value) == 0 && value != '') {
			MM_swapImage(fieldName,'','images/error.gif',0); 
			formName.elements[fieldName].title='Date invalid, enter date in format dd/mm/yyyy';
			returnValue = value;
		} 
		else 
		{ 
			ageDiv_dob.innerHTML=getAge(returnValue = formatDate(validateDate(value),'dd/MM/yyyy'),'16','65'); 
			MM_swapImage(fieldName,'','images/spacer.gif',0);
			formName.elements[fieldName].title='';
		}
	}
	else if (fieldType == "time")
	{
		// if an error
		if (validateTime(value) == 0 && value != '') {
			MM_swapImage(fieldName,'','images/error.gif',0); 
			formName.elements[fieldName].title='Time invalid, hours must be in the range 0..24 and minutes in the range 0..60';
			returnValue = value;
		} else {
			MM_swapImage(fieldName,'','images/spacer.gif',0);
			formName.elements[fieldName].title='';
			returnValue = validateTime(value);
		}
	}
	return returnValue;
}

// ------------------------------------------------------------------
// validateNI(String arg)
//
// Validates and formats a NINO number.
// Returns a validated and formatted NINO string in the format,
// AA NN NN NN A..D
// Author: DP. 10/02/2003
// ------------------------------------------------------------------
function validateNI(arg)
{
	var retString;
	argString = new String(arg.value);
	var temparray = argString.split(/\s/);
	tempString = new String(temparray.join(""));
	// if NINO string is not in format CCddddddC, then format.
	if(tempString.match(/[a-zA-Z][a-zA-Z][0-9][0-9][0-9][0-9][0-9][0-9][a-dA-D]/) != null)
	{		 
		var anArray = tempString.split("");
		var len = anArray.length;
		if(len >= 2 && anArray[2]!=" ")anArray.splice(2,0," ");
			len = anArray.length;
		if(len >= 5 && anArray[5]!=" ")anArray.splice(5,0," ");
			len = anArray.length;
		if(len >= 8 && anArray[8]!=" ")anArray.splice(8,0," ");
			len = anArray.length;
		if(len >= 11 && anArray[11]!="X")anArray.splice(11,0," ");	
			len = anArray.length;	 
			
		retString = new String(anArray.join("").toUpperCase());
	}
	else
	{
		retString=argString;
	}
	if (retString!=argString)
	{
		arg.value=retString;
	}
	// return the formatted string.
	return retString; 
} // end validateNI()


// ------------------------------------------------------------------
// getAge(String dobText)
//
// Calculates the age from the parameter String 'dobText'.
// Returns a String value representing the age in number of years
// from the date.
// Author: DP. 10/02/2003
// ------------------------------------------------------------------
function getAge(dobText, minAge, maxAge)
{
	var dob = dobText;

	if (dobText == "")
 		return "";
 
	var day  = dob.substr(0,2);
	var month = dob.substr(3,2);
	var year = dob.substr(6,4);
 
	 // Assumes person is born at midnight that day.
	 Dob   = new Date(year,month,day, "00","00","00" );
	 DateToday = new Date();
 
	 var nowDay = DateToday.getDate();
	 var nowMonth= (DateToday.getMonth()+1 ); // Add a month as Date month starts from 0, not 1.
	 var nowYear = DateToday.getYear();
	 var yearsOld = (nowYear - year);
 
	 // If b'day has not yet occured, then deduct a year from the age.
	 if ( (month > nowMonth) || ( (month == nowMonth) && (day > nowDay) ) )  {
		yearsOld = yearsOld - 1;
	 }
	var retVal;
	if (yearsOld >= 0 && yearsOld < minAge) {
		retVal =  "<SPAN CLASS='dob-minor'>minor Age : " + yearsOld + "</SPAN>" ;
	} else if (yearsOld >= minAge && yearsOld < maxAge) {
		retVal = "<SPAN CLASS='dob'>Age : " + yearsOld + "</SPAN>" ;
	} else if (yearsOld >= maxAge) {
		retVal = "<SPAN CLASS='dob-pension'>pension Age : " + yearsOld + "</SPAN>" ;
	}
	else {
		retVal = "<SPAN CLASS='dob-invalid'>Age: Invalid</SPAN>";
	}
	 return retVal
} // end getAge()


//------------------START OF DATE FUNCTIONS------------------------
var MONTH_NAMES=new Array('January','February','March','April','May','June','July','August','September','October','November','December',
							'Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec');
var DAY_NAMES=new Array('Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday','Sun',
						'Mon','Tue','Wed','Thu','Fri','Sat');

// nice little function to prepend a 0 to a single digit number, i.e. 0..9.
function LZ(x) {return(x<0||x>9?"":"0")+x}

// These are the patterns that the input date is matched against. 
var DATE_PATTERN=new Array('dMyy','ddMyy','dMMyy','ddMMyy',
					  'dMyyyy','ddMyyyy','dMMyyyy','ddMMyyyy',
					  // reverse of above
					  'yyMd','yyMdd','yyMMd','yyMMdd',
					  'yyyyMd','yyyyMdd','yyyyMMd','yyyyMMdd'
					  );

// ------------------------------------------------------------------
// validateDate(String date)
//
// The main entry point for all calls to the date functions. This is
// the function that will called from inside the HTML page passing 
// the value from the HTML text field as its parameter.
// Returns a date object which can be formatted into a chosen format
// using the formatDate(Date dateObject) function.
// Author: DP. 12/02/2003
// ------------------------------------------------------------------
function validateDate(date)
{
	tmpStr = new String(date);

	tmpStr = convertMonthToNumeric(tmpStr);
	tmpStr = performDateArithmetic(tmpStr);
	tmpStr = performKeywordArithmetic(tmpStr);

	// strip out any non numeric chars.
	stripNonNum = /(\D)/g;
	replaceWith = "";

	var dateObject;
	for (var i=0; i<DATE_PATTERN.length; i++)
	{	
		dateStr = tmpStr.replace(stripNonNum,replaceWith);

		dateObject=getDateFromFormat(dateStr,DATE_PATTERN[i]);
		if (dateObject!= 0)
			break;
	}

	// if a date has been extracted from the field, then return it so that
	// it can be formatted.
	if (dateObject!=0) {
		return dateObject;
	}
	else
	{
		return 0;
	}

}

function performKeywordArithmetic(tmpStr)
{
	keywordRegex = new RegExp("(^now|n|today|yesterday|y|tomorrow$)", "i"); 
	var strIndex	= tmpStr.search(keywordRegex);
	
	var keyword	= RegExp.$1;
	
	if (strIndex != -1) {
		switch(keyword.toLowerCase()) {
			case ("now")		: tmpStr = calcDaysToDate("+","0",new Date()); break;
			case ("n")			: tmpStr = calcDaysToDate("+","0",new Date()); break;
			case ("today")		: tmpStr = calcDaysToDate("+","0",new Date()); break;
			case ("yesterday")	: tmpStr = calcDaysToDate("-","1",new Date()); break;
			case ("y")			: tmpStr = calcDaysToDate("-","1",new Date()); break;
			case ("tomorrow")	: tmpStr = calcDaysToDate("+","1",new Date()); break;
			default: break;
		}
	}
	return tmpStr;
}

// ------------------------------------------------------------------
// performDateArithmetic(String tmpStr)
//
// Returns a formatted date string after performing an addition 
// or subtraction of the specified calendar field amount to 
// the dateObject.
// Checks for the following: +1|-1    - defaults to day calculations.
//							 +1d|-1d  - performs day calculations.
//							 +1m|-1m  - performs month calculations.
//							 +1y|-1y  - performs year calculations.
// Return value is in the format, ddMMyyyy.
// Author: DP. 13/02/2003
// ------------------------------------------------------------------
function performDateArithmetic(tmpStr)
{
	var tmpStr = tmpStr;
	// A regex to match for example +|-d(anything else after)(d)ays|(m)onths|(y)ears.
	arithmeticRegex = new RegExp("^(\\+|\\-)(\\d+)(\.*)$", "gi"); 
	
	var strIndex	= tmpStr.search(arithmeticRegex);
	
	var operator		= RegExp.$1;
	var numeric			= RegExp.$2;
	var calendarField	= RegExp.$3;

	var DAY_CALC	= "d"; // will match anything beginning with d, i.e. day or days.
	var MONTH_CALC	= "m"; // will match anything beginning with m, i.e. month or months.
	var YEAR_CALC	= "y"; // will match anything beginning with y, i.e. year or years.

	if (strIndex != -1) {
			switch(calendarField.substring(0,1).toLowerCase()) {
			case (DAY_CALC)	 : tmpStr = calcDaysToDate(operator,numeric,new Date()); break;
			case (MONTH_CALC): tmpStr = calcMonthsToDate(operator,numeric,new Date()); break;
			case (YEAR_CALC) : tmpStr = calcYearsToDate(operator,numeric,new Date()); break;
			default: tmpStr = calcDaysToDate(operator,numeric,new Date()); break;
		}
	}
	return tmpStr;
}

// ------------------------------------------------------------------
// calcDaysToDate(var operator, var intDays, Date dateObject)
//
// Returns a formatted date string after performing an addition 
// or subtraction of days to the dateObject.
// Return value is in the format, ddMMyyyy.
// Author: DP. 13/02/2003
// ------------------------------------------------------------------
function calcDaysToDate(operator,intDays,dateObject)
{
	var datEnd;
	var datStart = Date.parse(dateObject)

	if (operator == "+")	{	datEnd = datStart + intDays*(24*60*60*1000);	}	
	else if (operator == "-") {	datEnd = datStart - intDays*(24*60*60*1000);	}	

	datFinal = new Date(datEnd);
	return formatDateToString(datFinal);
}

// ------------------------------------------------------------------
// calcMonthsToDate(var operator, var intMonths, Date dateObject)
//
// Returns a formatted date string after performing an addition 
// or subtraction of months to the dateObject.
// Return value is in the format, ddMMyyyy.
// Author: DP. 13/02/2003
// ------------------------------------------------------------------
function calcMonthsToDate(operator,intMonths,dateObject) 
{
	var months;
	if (operator == "+")		{	months = parseInt(dateObject.getMonth()) + parseInt(intMonths); }
	else if (operator == "-")	{	months = parseInt(dateObject.getMonth()) - parseInt(intMonths); }

	dateObject.setMonth(months);
	return formatDateToString(dateObject);
}

// ------------------------------------------------------------------
// calcYearsToDate(var operator, var intYears, Date dateObject)
//
// Returns a formatted date string after performing an addition 
// or subtraction of years to the dateObject.
// Return value is in the format, ddMMyyyy.
// Author: DP. 13/02/2003
// ------------------------------------------------------------------
function calcYearsToDate(operator,intYears,dateObject) 
{
	var years;
	if (operator == "+")		{	years = parseInt(dateObject.getFullYear()) + parseInt(intYears); }
	else if (operator == "-")	{	years = parseInt(dateObject.getFullYear()) - parseInt(intYears); }
	dateObject.setFullYear(years);
	return formatDateToString(dateObject);
}

// ------------------------------------------------------------------
// formatDateToString(Date dateObject)
//
// Returns a date string from the date object.
// The return string is in the format, ddMMyyyy.
// Author: DP. 13/02/2003
// ------------------------------------------------------------------
function formatDateToString(dateObject)
{
	var retString;
	var theDate=dateObject;
	var day = theDate.getDate();
	var month = parseInt(theDate.getMonth()) + 1; //this is because months start at 0 in javascript
	var year = theDate.getFullYear();
	retString = LZ(day)+LZ(month)+year;
	return retString;
}

// ------------------------------------------------------------------
// convertMonthToNumeric(String tmpStr)
//
// Returns a date with the month text substituted for the equivalent
// month number, i.e. 28 "Jan" 03 --> 28 "1" 03
// The function uses the months in the MONTH_NAMES array to match and
// convert.
// Author: DP. 12/02/2003
// ------------------------------------------------------------------
function convertMonthToNumeric(tmpStr)
{
	notFound = new Boolean(true);
	for (var i=0; i<MONTH_NAMES.length; i++)
	{
		monthName = MONTH_NAMES[i];
		monthRegex = new RegExp(monthName, "gi");
		strIndex = tmpStr.search(monthRegex);

		// if there is a text month entered then..
		if (strIndex != -1 && notFound == true)	{
			if (i >= 12) {	i-= 11;	} else { i+=1; }
			// replace text month with numerical equivalent.
			tmpStr = tmpStr.replace(monthRegex,i);
			notFound = false;
		}
	}
	return tmpStr;
}

// ------------------------------------------------------------------
// formatDate (Date date, String format)
//
// Returns a Date object date in the output format specified.
// The format string uses the same abbreviations as in getDateFromFormat()
// ------------------------------------------------------------------
function formatDate(date,format) 
{
	if (date == 0)
	{
		return "";
	}
	else
	{
		date = new Date(date);
		format=format+"";
		var result="";
		var i_format=0;
		var c="";
		var token="";
		var y=date.getYear()+"";
		var M=date.getMonth()+1;
		var d=date.getDate();
		var E=date.getDay();
		var H=date.getHours();
		var m=date.getMinutes();
		var s=date.getSeconds();
		var yyyy,yy,MMM,MM,dd,hh,h,mm,ss,ampm,HH,H,KK,K,kk,k;
		// Convert real date parts into formatted versions
		var value=new Object();

		if (y.length < 4) {y=""+(y-0+1900);}
		
		value["y"]=""+y;
		value["yyyy"]=y;
		value["yy"]=y.substring(2,4);
		value["M"]=M;
		value["MM"]=LZ(M);
		value["MMM"]=MONTH_NAMES[M-1];
		value["d"]=d;
		value["dd"]=LZ(d);
		value["E"]=DAY_NAMES[E+7];
		value["EE"]=DAY_NAMES[E];
		value["H"]=H;
		value["HH"]=LZ(H);
		
		if (H==0) {
			value["h"]=12;
		}
		else if (H>12) {value["h"]=H-12;}
		else {value["h"]=H;}

		value["hh"]=LZ(value["h"]);
		
		if (H>11){ value["K"]=H-12;} else { value["K"]=H;}

		value["k"]=H+1;
		value["KK"]=LZ(value["K"]);
		value["kk"]=LZ(value["k"]);
		
		if (H > 11) { value["a"]="PM"; }
		else { value["a"]="AM"; }
		value["m"]=m;
		value["mm"]=LZ(m);
		value["s"]=s;
		value["ss"]=LZ(s);
		
		while (i_format < format.length) 
		{
			c=format.charAt(i_format);
			token="";
			while ((format.charAt(i_format)==c) && (i_format < format.length)) 
			{
				token += format.charAt(i_format++);
			}
			if (value[token] != null) { result=result + value[token]; }
			else { result=result + token; }
		}
		return result;
	}
}
	
// ------------------------------------------------------------------
// getDateFromFormat( date_string , format_string )
//
// This function takes a date string and a format string. It matches
// If the date string matches the format string, it returns the 
// getTime() of the date. If it does not match, it returns 0.
// ------------------------------------------------------------------
function getDateFromFormat(val,format) {
	val=val+"";
	format=format+"";
//	alert("dateFromFormat: " + format + ", value:" + val);
	var i_val=0;
	var i_format=0;
	var c="";
	var token="";
	var token2="";
	var x,y;
	var now=new Date();
	var year=now.getYear();
	var month=now.getMonth()+1;
	var date=1;
	var hh=now.getHours();
	var mm=now.getMinutes();
	var ss=now.getSeconds();
	var ampm="";
	var WINDOW_YEAR=30;

	while (i_format < format.length) 
	{
		// Get next token from format string
		c=format.charAt(i_format);
		token="";
		while ((format.charAt(i_format)==c) && (i_format < format.length)) 
		{
			token += format.charAt(i_format++);
		}
		// Extract contents of value based on format token
		if (token=="yyyy" || token=="yy" || token=="y") 
		{
			if (token=="yyyy") { x=4;y=4; }
			if (token=="yy")   { x=2;y=2; }
			if (token=="y")    { x=2;y=4; }
			year=_getInt(val,i_val,x,y);
		
			if (year==null) { return 0; }
			
			i_val += year.length;
			// Only try to window around year if two digit year is given, ie. yy
			if (year.length==2) 
			{
				if (year >= WINDOW_YEAR) { year=1900+(year-0); }
				else { year=2000+(year-0); }
				}
			}
		else if (token=="MMM"){
			month=0;
			for (var i=0; i<MONTH_NAMES.length; i++) {
				var month_name=MONTH_NAMES[i];
				if (val.substring(i_val,i_val+month_name.length).toLowerCase()==month_name.toLowerCase()) {
					month=i+1;
					if (month>12) { month -= 12; }
					i_val += month_name.length;
					break;
					}
				}
			if ((month < 1)||(month>12)){return 0;}
			}
		else if (token=="EE"||token=="E"){
			for (var i=0; i<DAY_NAMES.length; i++) {
				var day_name=DAY_NAMES[i];
				if (val.substring(i_val,i_val+day_name.length).toLowerCase()==day_name.toLowerCase()) {
					i_val += day_name.length;
					break;
					}
				}
			}
		else if (token=="MM"||token=="M") {
			month=_getInt(val,i_val,token.length,token.length);
//			month=_getInt(val,i_val,token.length,2);
			if(month==null||(month<1)||(month>12)){return 0;}
			i_val+=month.length;}
		else if (token=="dd"||token=="d") {
//			date=_getInt(val,i_val,token.length,2);
			date=_getInt(val,i_val,token.length,token.length);
//			alert("date value: " + date);
			if(date==null||(date<1)||(date>31)){return 0;}
			i_val+=date.length;}
		else if (token=="hh"||token=="h") {
			hh=_getInt(val,i_val,token.length,2);
			if(hh==null||(hh<1)||(hh>12)){return 0;}
			i_val+=hh.length;}
		else if (token=="HH"||token=="H") {
			hh=_getInt(val,i_val,token.length,2);
			if(hh==null||(hh<0)||(hh>23)){return 0;}
			i_val+=hh.length;}
		else if (token=="KK"||token=="K") {
			hh=_getInt(val,i_val,token.length,2);
			if(hh==null||(hh<0)||(hh>11)){return 0;}
			i_val+=hh.length;}
		else if (token=="kk"||token=="k") {
			hh=_getInt(val,i_val,token.length,2);
			if(hh==null||(hh<1)||(hh>24)){return 0;}
			i_val+=hh.length;hh--;}
		else if (token=="mm"||token=="m") {
			mm=_getInt(val,i_val,token.length,2);
			if(mm==null||(mm<0)||(mm>59)){return 0;}
			i_val+=mm.length;}
		else if (token=="ss"||token=="s") {
			ss=_getInt(val,i_val,token.length,2);
			if(ss==null||(ss<0)||(ss>59)){return 0;}
			i_val+=ss.length;}
		else if (token=="a") {
			if (val.substring(i_val,i_val+2).toLowerCase()=="am") {ampm="AM";}
			else if (val.substring(i_val,i_val+2).toLowerCase()=="pm") {ampm="PM";}
			else {return 0;}
			i_val+=2;}
		else {
			if (val.substring(i_val,i_val+token.length)!=token) {return 0;}
			else {i_val+=token.length;}
			}
		}
	// If there are any trailing characters left in the value, it doesn't match
	if (i_val != val.length) { return 0; }

	// Is date valid for month?
	if (month==2) 
	{
		// Check for leap year
		if ( ( (year%4==0)&&(year%100 != 0) ) || (year%400==0) ) 
		{ // leap year
			if (date > 29){ alert("invalid leap day"); return false; }
		}
		else 
		{ 
			if (date > 28) { return false; } }
		}
		if ((month==4)||(month==6)||(month==9)||(month==11)) 
		{
			if (date > 30) { return false; }
		}
	
	// Correct hours value
	if (hh<12 && ampm=="PM") { hh=hh-0+12; }
	else if (hh>11 && ampm=="AM") { hh-=12; }

	var newdate=new Date(year,month-1,date,hh,mm,ss);
	
	return newdate.getTime();
}

// ------------------------------------------------------------------
// Utility functions for parsing in getDateFromFormat()
// ------------------------------------------------------------------
function _isInteger(val) 
{
	var digits="1234567890";
	for (var i=0; i < val.length; i++) 
	{
		if (digits.indexOf(val.charAt(i))==-1) { return false; }
	}
	return true;
}

function _getInt(str,i,minlength,maxlength) 
{
	for (var x=maxlength; x>=minlength; x--) 
	{
		var token=str.substring(i,i+x);
		if (token.length < minlength) { return null; }
		if (_isInteger(token)) { return token; }
	}
	return null;
}
//------------------END OF DATE FUNCTIONS------------------------//