//General variables
var digitsInUSPhoneNumber = 10;

var digitsInZIPCode1 = 5;
var digitsInZIPCode2 = 9;

var digits = "0123456789";

var USStateCodeDelimiter = "|";
var USStateCodes = "AL|AK|AS|AZ|AR|CA|CO|CT|DE|DC|FM|FL|GA|GU|HI|ID|IL|IN|IA|KS|KY|LA|ME|MH|MD|MA|MI|MN|MS|MO|MT|NE|NV|NH|NJ|NM|NY|NC|ND|MP|OH|OK|OR|PW|PA|PR|RI|SC|SD|TN|TX|UT|VT|VI|VA|WA|WV|WI|WY|AE|AA|AE|AE|AP";

//General Use functions
function isEmpty(s) {
	return ((s == null) || (s.length == 0));
}
function stripCharsInBag(s, bag) {
	var i;
	var returnString = "";
	// Search through string's characters one by one.
	// If character is not in bag, append to returnString.
	for (i=0; i<s.length; i++) {
		// Check that current character isn't whitespace.
		var c = s.charAt(i);
		if (bag.indexOf(c) == -1) {
			returnString += c;
		}
	}
	return returnString;
}
function stripCharsNotInBag(s, bag) {
	var i;
	var returnString = "";
	// Search through string's characters one by one.
	// If character is in bag, append to returnString.
	for (i=0; i<s.length; i++) {
		// Check that current character isn't whitespace.
		var c = s.charAt(i);
		if (bag.indexOf(c) != -1) {
			returnString += c;
		}
	}
	return returnString;
}

function reformatZIPCode(s) {
	if (s.length == 5) {
		return s;
	} else {
		return (s.substr(0, 5)+ "-" + s.substr(5, 4));
	}
}

function reformatUSPhone(s) {
	return ("(" + s.substr(0, 3) + ") " + s.substr(3, 3) + "-" + s.substr(6, 4));
}
//--------------------------------------------------------------------------
//Individual Validation Functions
//--------------------------------------------------------------------------
function isEmail(address) {
	if (address.length>=7) {
		if (address.indexOf("@")>0) {
			if ((address.indexOf("@")+2)<address.lastIndexOf(".")) {
				if (address.lastIndexOf(".")<(address.length-2)) {
					return (true);
				}
			}
		}
	}
	return (false);
}

function isStateCode(s) {
	if (isEmpty(s)) {
		if (isStateCode.arguments.length == 1) {
			return defaultEmptyOK;
		} else {
			return (isStateCode.arguments[1] == true);
		}
	}
	return ((USStateCodes.indexOf(s) != -1) && (s.indexOf(USStateCodeDelimiter) == -1));
}

function isZIPCode(ZIP) {
	//strip out characters other than _digits
	var newZip = stripCharsNotInBag(ZIP,digits);
	//var newZip = ZIP;
	//if has 5 or 9 _digits, assume ok **NOTE** there is no checking for format
	return (newZip.length == digitsInZIPCode1 || newZip.length == digitsInZIPCode2);
	
}

function isUSPhone(Phone) {
	//strip out characters other than _digits
	var newPhone = stripCharsNotInBag(Phone,digits);
	//if has 10_digits, assume ok **NOTE** there is no checking for format
	return (newPhone.length == digitsInUSPhoneNumber);
	
}


// Declaring valid date character, minimum year and maximum year
var dtCh= "/";
var minYear=1900;
var maxYear=2100;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strMonth=dtStr.substring(0,pos1)
	var strDay=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth);
	day=parseInt(strDay);
	year=parseInt(strYr);
	if (pos1==-1 || pos2==-1){
		//alert("The date format should be : mm/dd/yyyy")
		return false;
	}
	if (strMonth.length<1 || month<1 || month>12){
		//alert("Please enter a valid month")
		return false;
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		//alert("Please enter a valid day")
		return false;
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		//alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		return false;
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		//alert("Please enter a valid date")
		return false;
	}
return true;
}


//Global Validation Function
//return this in event handler
//----------------------------------------------------------------------------------

function validateForm(fields, messages) {
	var i;
	var form = document.forms[0];
	
	for (i=0; i<fields.length; i++) {
		var formitem = eval('form.' + fields[i]  + '.value');
		var formvar = fields[i];
		var formObj = eval('form.' + fields[i]);
		if (formitem == undefined | formitem == "") {
			alert(messages[i]);
			//formObj.focus();
			return false;
		} else if (formvar.substr(formvar.length-5, 5) == 'email') {
			if (!isEmail(formitem)) {
				alert(messages[i]);
				return false;
			}
		} else if (formvar == 'StateCode') {
			if (!isStateCode(formitem)) {
				alert(messages[i]);
				return false;
			}
		} else if (formvar == 'ZipCode') {
			if (!isZIPCode(formitem)) {
				alert(messages[i]);
				return false;
			}
			//remove following else{} if don't care to reformat Zip
			else {
				formObj.value = reformatZIPCode(stripCharsNotInBag(formitem, digits));
			}
		} else if (formvar.substr(formvar.length-5, 5) == 'phone') {
			if (!isUSPhone(formitem)) {
				alert(messages[i]);
				return false;
			}
			//remove following else{} if don't care to reformat phone
			else {
				//need to fix this
				 formObj.value = reformatUSPhone(stripCharsNotInBag(formitem, digits));
			} 
		} else if (formvar == 'birthDate') {
				if (!isDate(formitem)){
					alert(messages[i]);
					return false;
				}
		}
		else if (formvar == 'Textarea1') {
				if (formitem == ''){
					alert(messages[i]);
					return false;
				}
		}		
	}
	return true;
}