// FormCheck.js
//
// R. Daugherty -- added functions for "easy" e-mail/zip checking - Sept. 2, 2003
// SUMMARY
//
// This is a set of JavaScript functions for validating input on
// an HTML form.  Functions are provided to validate:
//

// BASIC DATA VALIDATION FUNCTIONS:
//
// isWhitespace (s)                    Check whether string s is empty or whitespace.
// isLetter (c)                        Check whether character c is an English letter
// isDigit (c)                         Check whether character c is a digit
// isLetterOrDigit (c)                 Check whether character c is a letter or digit.
//
// isInteger (s [,eok])                True if all characters in string s are numbers.
// isSignedInteger (s [,eok])          True if all characters in string s are numbers; leading + or - allowed.
// isPositiveInteger (s [,eok])        True if string s is an integer > 0.
// isNonnegativeInteger (s [,eok])     True if string s is an integer >= 0.
// isNegativeInteger (s [,eok])        True if s is an integer < 0.
// isNonpositiveInteger (s [,eok])     True if s is an integer <= 0.
// isFloat (s [,eok])                  True if string s is an unsigned floating point (real) number. (Integers also OK.)
// isSignedFloat (s [,eok])            True if string s is a floating point number; leading + or - allowed. (Integers also OK.)
// isAlphabetic (s [,eok])             True if string s is English letters
// isAlphanumeric (s [,eok])           True if string s is English letters and numbers only.

// FUNCTIONS TO REFORMAT DATA:
//
// stripCharsInBag (s, bag)            Removes all characters in string bag from string s.
// stripCharsNotInBag (s, bag)         Removes all characters NOT in string bag from string s.
// stripWhitespace (s)                 Removes all whitespace characters from s.
// stripInitialWhitespace (s)          Removes initial (leading) whitespace characters from s.
// reformat (TARGETSTRING, STRING,     Function for inserting formatting characters or
//   INTEGER, STRING, INTEGER ... )       delimiters into TARGETSTRING.

// PARALLEL NURIDE
var emailExpr = /^([a-z0-9\'\.\-_])+\@(([a-z0-9\-])+\.)+([a-z0-9]{2,4})$/i;
var nameExpr = /^[a-z][a-z0-9\'\- ]{1,15}$/i;		// name can have a-z, 0-9, single-quote, space
var zipExpr = /^[0-9]{5}$/;
var usernameExpr = /^([a-z0-9\.\-_]{6,16})$/i;
var elementNameExpr = /^([a-z0-9 \'_\-\.\,\#]{3,})$/i;

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";

var digits = "0123456789";
var lowercaseLetters = "abcdefghijklmnopqrstuvwxyz";
var uppercaseLetters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
var whitespace = " \t\n\r";
var decimalPointDelimiter = ".";
var phoneNumberDelimiters = "()- ";
var validUSPhoneChars = digits + phoneNumberDelimiters;
var validWorldPhoneChars = digits + phoneNumberDelimiters + "+";
var SSNDelimiters = "- ";
var validSSNChars = digits + SSNDelimiters;
var digitsInSocialSecurityNumber = 9;
var digitsInUSPhoneNumber = 10;
var ZIPCodeDelimiters = "-";
var validZIPCodeChars = digits + ZIPCodeDelimiters;
var digitsInZIPCode1 = 5;
var digitsInZIPCode2 = 9;

var iStateCode = "This field must be a valid two character U.S. state abbreviation (like CA for California). Please reenter it now.";
var iZIPCode = "This field must be a 5 or 9 digit U.S. ZIP Code (like 94043). Please reenter it now.";
var iUSPhone = "This field must be a 10 digit U.S. phone number (like 415 555 1212). Please reenter it now.";

var defaultEmptyOK = false;

function handleEnter (field, event)
{
		var keyCode = event.keyCode ? event.keyCode : event.which ? event.which : event.charCode;
		if (keyCode == 13) {
			var i;
			for (i = 0; i < field.form.elements.length; i++)
				if (field == field.form.elements[i])
					break;
			i = (i + 1) % field.form.elements.length;
			field.form.elements[i].focus();
			return false;
		}
		else
		return true;
	}


function formElement(f)
{
    return document.forms[0].elements[f];
}

function executeFormX(url)
{
    document.forms[0].action = url;
    document.forms[0].submit();
}

function jumpField(fld, newfld, sz, numonly)
{
	var v = fld.value;
	var l = v.length;

	if (numonly) {
		var i;
		var nf = "";
		var c;
		for (i=0;i<l;i++) {
			c = v.charAt(i);
			if (c >= '0' && c <= '9')
				nf += c;
		}
		v = nf;
		l = v.length;
		fld.value = v;
	}
	if (l == sz) {
		formElement(newfld).focus();
		formElement(newfld).select();
	}
}

function showError(msg, fld)
{
	alert(msg);
	fld.focus();
	return;
}

function validStreetNumber(fld)
{
	var s = fld.value;
	var ix = s.indexOf(' ');
	if (ix == -1) return false;
	var n = s.substring(0, ix);
	var uu = n * 1.0;
	if (isNaN(uu)) return false;
	if (uu < 1) return false;
	return true;
}

function validateFaxNumber()
{
	var f1 = formElement('Fax_AC');
	var f2 = formElement('Fax_EXC');
	var f3 = formElement('Fax_NO');

	var ttl = f1.value.length + f2.value.length + f3.value.length;
	if (ttl == 0) return "";

	if (f1.value.length < 3) {
		showError('Please enter a valid fax number (AC).', f1);
		return "X";
	}
	if (f1.value.charAt(0) == '0') {
		showError('Please enter a valid fax number (AC).', f1);
		return "X";
	}
	if ((f1.value.charAt(0) == f1.value.charAt(1)) && (f1.value.charAt(1) == f1.value.charAt(2)))
	{
		if (f1.value.charAt(0) != '8') {
			showError('Please enter a valid fax number (AC).', f1);
			return "X";
		}
	}
	if (f2.value.length < 3) {
		showError('Please enter a valid fax number (EXC).', f2);
		return "X";
	}
	if (f2.value == "555") {
		showError('Please enter a valid fax number (EXC).', f2);
		return "X";
	}
	if (f3.value.length < 4) {
		showError('Please enter a valid fax number (NUM).', f3);
		return "X";
	}

	var result = f1.value + "-" + f2.value + "-" + f3.value;
	return result;
}

function validatePhoneNumber()
{
	return validatePhoneNumberX('Phone', false);
}

function validatePhoneNumberX2(pfx, rq)
{
	var f1 = formElement(pfx + '_AC');
	var f2 = formElement(pfx + '_EXC');
	var f3 = formElement(pfx + '_NO');

	var ttl = f1.value.length + f2.value.length + f3.value.length;
	if (ttl == 0) {
		if (rq) {
			showError('Please enter your phone number.', f1);
			return "X";
		}
		return "";
	}

	if (f1.value.length < 3) {
		showError('Please enter your phone number (AC).', f1);
		return "X";
	}

	if (f1.value.charAt(0) == '0') {
		showError('Please enter a valid phone number (AC).', f1);
		return "X";
	}

	if ((f1.value.charAt(0) == f1.value.charAt(1)) && (f1.value.charAt(1) == f1.value.charAt(2)))
	{
		if (f1.value.charAt(0) != '8') {
			showError('Please enter a valid phone number (AC).', f1);
			return "X";
		}
	}

	if (f2.value.length < 3) {
		showError('Please enter your phone number (EXC).', f2);
		return "X";
	}
	if (f2.value == "555") {
		showError('Please enter a valid phone number (EXC).', f2);
		return "X";
	}
	if (f3.value.length < 4) {
		showError('Please enter your phone number (NUM).', f3);
		return "X";
	}

	if (isNaN(f1.value)) {
	    showError('Please enter a valid phone number (AC).', f1);
	    return "X";
	}

	if (isNaN(f2.value)) {
	    showError('Please enter a valid phone number (EXC).', f1);
	    return "X";
	}

	if (isNaN(f3.value)) {
	    showError('Please enter a valid phone number (NO).', f1);
	    return "X";
	}


	var result = f1.value + "-" + f2.value + "-" + f3.value;
	return result;
}

function validatePhoneNumberX(pfx, rq)
{
	var f1 = formElement(pfx + '_AC');
	var f2 = formElement(pfx + '_EXC');
	var f3 = formElement(pfx + '_NO');
	var f4 = formElement(pfx + '_EXT');

	var ttl = f1.value.length + f2.value.length + f3.value.length + f4.value.length;

	if (ttl == 0) {
		if (rq == true) {
			showError('Please enter your phone number.', f1);
			return "X";
		}
		return "";
	}

	if (f1.value.length < 3) {
		showError('Please enter your phone number (AC).', f1);
		return "X";
	}

	if (f1.value.charAt(0) == '0') {
		showError('Please enter a valid phone number (AC).', f1);
		return "X";
	}

	if ((f1.value.charAt(0) == f1.value.charAt(1)) && (f1.value.charAt(1) == f1.value.charAt(2)))
	{
		if (f1.value.charAt(0) != '8') {
			showError('Please enter a valid phone number (AC).', f1);
			return "X";
		}
	}

	if (f2.value.length < 3) {
		showError('Please enter your phone number (EXC).', f2);
		return "X";
	}
	if (f2.value == "555") {
		showError('Please enter a valid phone number (EXC).', f2);
		return "X";
	}
	if (f3.value.length < 4) {
		showError('Please enter your phone number (NUM).', f3);
		return "X";
	}
	var result = f1.value + "-" + f2.value + "-" + f3.value + " " + f4.value;
	return result;
}

function isDateValid(month,day,year)
{
    if (month < 1 || month > 12) { // check month range
        alert("Month must be between 1 and 12.");
        return false;
    }

    if (day < 1 || day > 31) {
        alert("Day must be between 1 and 31.");
        return false;
    }

    if ((month==4 || month==6 || month==9 || month==11) && day==31) {
        alert("Month "+month+" doesn't have 31 days!")
        return false;
    }

    if (month == 2) { // check for february 29th
        var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
        if (day > 29 || (day==29 && !isleap)) {
            alert("February " + year + " doesn't have " + day + " days!");
            return false;
        }
    }
    return true; // date is valid
}

function isDateStr(dateStr) {

    var datePat = /^(\d{1,2})(\/|-)(\d{1,2})(\/|-)(\d{4})$/;
    var matchArray = dateStr.match(datePat); // is the format ok?

    if (matchArray == null) {
        alert("Please enter date as either mm/dd/yyyy or mm-dd-yyyy.");
        return false;
    }

    month = matchArray[1]; // parse date into variables
    day = matchArray[3];
    year = matchArray[5];

    if (month < 1 || month > 12) { // check month range
        alert("Month must be between 1 and 12.");
        return false;
    }

    if (day < 1 || day > 31) {
        alert("Day must be between 1 and 31.");
        return false;
    }

    if ((month==4 || month==6 || month==9 || month==11) && day==31) {
        alert("Month "+month+" doesn't have 31 days!")
        return false;
    }

    if (month == 2) { // check for february 29th
        var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
        if (day > 29 || (day==29 && !isleap)) {
            alert("February " + year + " doesn't have " + day + " days!");
            return false;
        }
    }
    return true; // date is valid
}

function warn(fld, msg) {
	if(msg!='')
		alert(msg);
    fld.focus();
    fld.select();
    return false;
}

function warnInvalid (theField, s)
{
    alert(s);
	theField.focus();
    theField.select();
    return false;
}

function isEmpty(s)
{
    return ((s == null) || (s.length == 0));
}

function isWhitespace(s)
{
    var i;
    if (isEmpty(s)) return true;
    for (i = 0; i < s.length; i++)
    {
        var c = s.charAt(i);
        if (whitespace.indexOf(c) == -1) return false;
    }
    return true;
}

function hasCharsInBag(s, bag)
{
    var i;

    for (i = 0; i < s.length; i++)
    {
        var c = s.charAt(i);
        if (bag.indexOf(c) != -1) return true;
    }
    return false;
}

function stripCharsInBag(s, bag)
{
    var i;
    var returnString = "";

    for (i = 0; i < s.length; i++)
    {
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function getSelectValue(sel)
{
	var m = sel.selectedIndex;
	var v = sel[m].value;
	return v;
}

function getRadioButtonValue (radio)
{
    var m = radio.length;
    if (isNaN(m)) {
        if (radio.checked) {
            return radio.value;
        } else {
            return -1;
        }
    }
	for (var i = 0; i < radio.length; i++)
    {
		if (radio[i].checked)
		{
			return radio[i].value;
		}
    }
    return -1;
}

function countCharsInBag(s, bag)
{
    var i;
    var result = 0;

    for (i = 0; i < s.length; i++)
    {
        var c = s.charAt(i);
        if (bag.indexOf(c) != -1) result++;
    }
    return result;
}

function stripCharsNotInBag(s, bag)
{
    var i;
    var returnString = "";

    for (i = 0; i < s.length; i++)
    {
        var c = s.charAt(i);
        if (bag.indexOf(c) != -1) returnString += c;
    }
    return returnString;
}

function stripWhitespace(s)
{
    return stripCharsInBag(s, whitespace);
}

function stripInitialWhitespace(s)
{
    var i = 0;

    while ((i < s.length) && (whitespace.indexOf(s.charAt(i)) != -1))
        i++;
    return s.substring (i, s.length);
}

function reformat(s)
{
	var arg;
    var sPos = 0;
    var resultString = "";

    for (var i = 1; i < reformat.arguments.length; i++) {
       arg = reformat.arguments[i];
       if (i % 2 == 1) resultString += arg;
       else {
           resultString += s.substring(sPos, sPos + arg);
           sPos += arg;
       }
    }
    return resultString;
}

function isLetter(c)
{
    return ( ((c >= "a") && (c <= "z")) || ((c >= "A") && (c <= "Z")) );
}

function isDigit(c)
{
    return ((c >= "0") && (c <= "9"));
}

function isLetterOrDigit (c)
{
    return (isLetter(c) || isDigit(c));
}

function isValidLength(fld, sz)
{
    var xx = stripInitialWhitespace(fld.value);
    fld.value = xx;
    if (isWhitespace(fld.value)) return false;
    if (fld.value.length < sz) return false;
    return true;
}

function checkLengthBogus(fld, sz, msg)
{
	var passLength = checkLength(fld, sz, msg);
	if (passLength == true) {
		var bag1 = fld.value.indexOf("sdf");
		var bag2 = fld.value.indexOf("asdf");
		var bag3 = fld.value.indexOf("jkl");
		if ((bag1 > -1) || (bag2 > -1) || (bag3 > -1)) {
			return warn(fld,msg);
		} else {
			return true;
		}
	} else
		return false;
}

function checkLength(fld, sz, msg)
{
    var xx = stripInitialWhitespace(fld.value);
    fld.value = xx;
    if (isWhitespace(fld.value)) return warn(fld,msg);
    if (fld.value.length < sz) return warn(fld,msg);
    return true;
}

function checkAlphanumeric(fld, msg)
{
    if (isAlphanumeric(fld.value)) return true;
    return warn(fld,msg);
}

function checkAlphanumericLength(fld, sz, msg)
{
    if (isWhitespace(fld.value)) return warn(fld,msg);
    if (fld.value.length < sz) return warn(fld,msg);
    if (isAlphanumeric(fld.value)) return true;
    return warn(fld,msg);
}

function checkPasswordLength(fld, sz, msg)
{
    if (isWhitespace(fld.value)) return warn(fld, msg);
    if (fld.value.length < sz) return warn(fld, msg);
    if (isAlphanumeric(fld.value)) return true;
    if (isPassword(fld.value)) return true;
    return warn(fld,msg);
}

function checkZip(fld, msg) {
    if (isZIPCode(fld.value)) return true;
    return warn(fld,msg);
}

function checkEmail(fld, msg) {
    if (isEmail(fld.value)) return true;
    return warn(fld,msg);
}

function stripCharsInBag (s, bag) {
	var i;
    var returnString = "";

    for (i = 0; i < s.length; i++)
    {
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function isAlphanumeric(s)
{
    var i;

    if (isEmpty(s))
    {
        if (!defaultEmptyOK)
            return false;
        return true;
    }

    for (i = 0; i < s.length; i++)
    {
        var c = s.charAt(i);
        if (! (isLetter(c) || isDigit(c) ) )
        return false;
    }
    return true;
}

function isInteger(s)
{
    var i;

    if (isEmpty(s))
    {
        if (!defaultEmptyOK)
            return false;
        return true;
    }

    for (i = 0; i < s.length; i++)
    {
        if (!isDigit(s.charAt(i))) return false;
    }
    return true;
}

function isSignedInteger(s)
{
    if (isEmpty(s))
    {
        if (!defaultEmptyOK)
            return false;
        return true;
    }

    var startPos = 0;

    // skip leading + or -
    if ( (s.charAt(0) == "-") || (s.charAt(0) == "+") )
        startPos = 1;
    return (isInteger(s.substring(startPos, s.length)));
}

function isPositiveInteger(s)
{
    return (isSignedInteger(s)
         && ( (isEmpty(s) )  || (parseInt (s) > 0) ) );
}

function isNonnegativeInteger(s)
{
    return (isSignedInteger(s)
         && ( (isEmpty(s) )  || (parseInt (s) >= 0) ) );
}

function isNegativeInteger(s)
{
    return (isSignedInteger(s)
         && ( (isEmpty(s) )  || (parseInt (s) < 0) ) );
}

function isNonpositiveInteger(s)
{
    return (isSignedInteger(s)
         && ( (isEmpty(s) )  || (parseInt (s) <= 0) ) );
}

function isFloat(s)
{
    var i;
    var seenDecimalPoint = false;

    if (isEmpty(s))
    {
        if (!defaultEmptyOK)
            return false;
        return true;
    }

    if (s == decimalPointDelimiter) return false;

    for (i = 0; i < s.length; i++)
    {
        var c = s.charAt(i);
        if ((c == decimalPointDelimiter) && !seenDecimalPoint) seenDecimalPoint = true;
        else if (!isDigit(c)) return false;
    }
    return true;
}

function isSignedFloat(s) {
    if (isEmpty(s))
    {
        if (!defaultEmptyOK)
            return false;
        return true;
    }
    var startPos = 0;
    if ( (s.charAt(0) == "-") || (s.charAt(0) == "+") )
        startPos = 1;
    return (isFloat(s.substring(startPos, s.length)))
}

function isAlphabetic(s) {
    var i;

    if (isEmpty(s))
    {
        if (!defaultEmptyOK)
            return false;
        return true;
    }

    for (i = 0; i < s.length; i++) {
        if (!isLetter(s.charAt(i)))
        return false;
    }
    return true;
}

function isZIPCode(s) {
    if (isEmpty(s))
        return false;
    return (isInteger(s) &&
            ((s.length == digitsInZIPCode1) ||
            (s.length == digitsInZIPCode2)));
}

function checkAt(s) {
	return countCharsInBag(s, "@") != 1;
}

function afterAt(s) {
	if(s.indexOf("@") != -1)
		return s.split("@")[1];
	return s;
}

function isEmail(s) {
    if (isEmpty(s))
        return false;

    if (isWhitespace(s)) return false;

	if (hasCharsInBag(afterAt(s), "'")) return false;
	if (hasCharsInBag(s, " <>&#$*()[]\\?/,^:;")) return false;
	if (countCharsInBag(s, "@") != 1) return false;
	if (countCharsInBag(s, ".") < 1) return false;

    // there must be >= 1 character before @, so we
    // start looking at character position 1
    // (i.e. second character)
    var i = 1;
    var sLength = s.length;

    // look for @
    while ((i < sLength) && (s.charAt(i) != "@"))
    { i++;
    }

    if ((i >= sLength) || (s.charAt(i) != "@")) return false;
    else i += 2;

    // look for .
    while ((i < sLength) && (s.charAt(i) != "."))
    { i++;
    }

    // there must be at least one character after the .
    if ((i >= sLength - 1) || (s.charAt(i) != ".")) return false;
    else return true;
}

function isStateCode(s)
{
	if (isEmpty(s))
		return false;
    return ( (USStateCodes.indexOf(s) != -1) &&
             (s.indexOf(USStateCodeDelimiter) == -1) );
}

function checkStateCode(theField)
{
	if (isEmpty(theField.value))
		return warnInvalid (theField, iStateCode);

	theField.value = theField.value.toUpperCase();
	if (!isStateCode(theField.value, false))
		return warnInvalid (theField, iStateCode);
	else
		return true;
}

function reformatZIPCode (ZIPString)
{   if (ZIPString.length == 5) return ZIPString;
    else return (reformat (ZIPString, "", 5, "-", 4));
}

function checkZIPCode (theField)
{
	if (isEmpty(theField.value))
		return warnInvalid (theField, iZIPCode);
	var normalizedZIP = stripCharsInBag(theField.value, ZIPCodeDelimiters);
    if (!isZIPCode(normalizedZIP, false))
		return warnInvalid (theField, iZIPCode);
	else
    {
		theField.value = reformatZIPCode(normalizedZIP)
        return true;
	}
}