// Form Validation Functions  v1.1.6
// http://www.dithered.com/javascript/form_validation/index.html
// code by Chris Nott (chris@NOSPAMdithered.com - remove NOSPAM)


// mod by Oleg V.Bezuglov at 19 March, 2004
// look up for 'fk' keyword

function getFormErrors(form) {
   var errors = new Array();
   
   // loop thru all form elements
   for (var elementIndex = 0; elementIndex < form.elements.length; elementIndex++) {
      var element = form.elements[elementIndex];
     
      // text and textarea types
      if (element.type == "text" || element.type == "textarea") {
         element.value = trimWhitespace(element.value)
         
         // required element
         if (element.required  && element.value == '') {
            errors[errors.length] = element.requiredError;
         }
         
         // maximum length
         else if (element.maxlength && isValidLength(element.value, 0, element.maxlength) == false) {
            errors[errors.length] = element.maxlengthError;
         }

         // minimum length
         else if (element.minlength && isValidLength(element.value, element.minlength, Number.MAX_VALUE) == false) {
            errors[errors.length] = element.minlengthError;
         }

         else if (element.range && isValidRange(element.value, element.range) == false) {
            errors[errors.length] = element.rangeError;
         }
         
         // pattern (credit card number, email address, zip or postal code, alphanumeric, numeric)
         else if (element.pattern) {
            if ( ( (element.pattern.toLowerCase() == 'visa' || element.pattern.toLowerCase() == 'mastercard' || element.pattern.toLowerCase() == 'american express' || element.pattern.toLowerCase() == 'diners club' || element.pattern.toLowerCase() == 'discover' || element.pattern.toLowerCase() == 'enroute' || element.pattern.toLowerCase() == 'jcb' || element.pattern.toLowerCase() == 'credit card') && isValidCreditCard(element.value, element.pattern) == false) ||
                  (element.pattern.toLowerCase() == 'email' && isValidEmailStrict(element.value) == false) ||
                  (element.pattern.toLowerCase() == 'zip or postal code' && isValidZipcode(element.value) == false && isValidPostalcode(element.value) == false) ||
                  (element.pattern.toLowerCase() == 'zipcode' && isValidZipcode(element.value) == false) ||
                  (element.pattern.toLowerCase() == 'postal code' && isValidPostalcode(element.value) == false) ||
                  (element.pattern.toLowerCase() == 'us phone number' && 
                     ( (element.prefix && element.suffix && isValidUSPhoneNumber(element.value, form[element.prefix].value, form[element.suffix].value) == false) || 
                        (!element.prefix && !element.suffix && isValidUSPhoneNumber(element.value) == false) ) ) ||
                  (element.pattern.toLowerCase() == 'alphanumeric' && isAlphanumeric(element.value, true) == false) ||
                  (element.pattern.toLowerCase() == 'numeric' && isNumeric(element.value, true) == false) ||
                  (element.pattern.toLowerCase() == 'alphabetic' && isAlphabetic(element.value, true) == false) ||
                  (element.pattern.toLowerCase() == 'webaddress' && isValidWebAddress(element.value) == false) ) {
               errors[errors.length] = element.patternError;
            }
         }
      }
      
      // password 
      else if (element.type == "password") {
         
         // required element
         if (element.required  && element.value == '') {
            errors[errors.length] = element.requiredError;
         }
         
         // maximum length
         else if (element.maxlength && isValidLength(element.value, 0, element.maxlength) == false) {
            errors[errors.length] = element.maxLengthError;
         }

         // minimum length
         else if (element.minlength && isValidLength(element.value, element.minlength, Number.MAX_VALUE) == false) {
            errors[errors.length] = element.minLengthError;
         }
      }
      
      // file upload
      if (element.type == "file") {
         
         // required element
         if (element.required  && element.value == '') {
            errors[errors.length] = element.requiredError;
         }
      }
      
      // select
      else if (element.type == "select-one" || element.type == "select-multiple" || element.type == "select") {

         // required element
         if (element.required && element.selectedIndex == -1) {
            errors[errors.length] = element.requiredError;
         }
         
         // disallow empty value selection
         else if (element.disallowEmptyValue && element.options[element.selectedIndex].value == '') {
            errors[errors.length] = element.disallowEmptyValueError;
         }

      }
      
      // radio buttons
      else if (element.type == "radio") {
         var radiogroup = form.elements[element.name];
         
         // required element
         if (radiogroup.required && radiogroup.length) {
            var checkedRadioButton = -1;
            for (var radioIndex = 0; radioIndex < radiogroup.length; radioIndex++) {
               if (radiogroup[radioIndex].checked == true) {
                  checkedRadioButton = radioIndex;
                  break;
               }
            }
            if (checkedRadioButton == -1 && !radiogroup.tested) {
               errors[errors.length] = radiogroup.requiredError;
               radiogroup.tested = true;
            }
         }
         
         radiogroup = null;
      }
   }
   
    return errors;
}

/*
* --------------- start ---------------------> SPECIAL MOD FOR FIELD HIGHLIGHTING //yeremeiev
*/

function getProblemFields(form) {
   var problemFields = new Array();
   
   // loop thru all form elements
   for (var elementIndex = 0; elementIndex < form.elements.length; elementIndex++) {
      var element = form.elements[elementIndex];
     
      // text and textarea types
      if (element.type == "text" || element.type == "textarea") {
         element.value = trimWhitespace(element.value)
         
         // required element
         if (element.required  && element.value == '') {
            problemFields[problemFields.length] = element.id;
         }
         
         // maximum length
         else if (element.maxlength && isValidLength(element.value, 0, element.maxlength) == false) {
            problemFields[problemFields.length] = element.id;
         }

         // minimum length
         else if (element.minlength && isValidLength(element.value, element.minlength, Number.MAX_VALUE) == false) {
            problemFields[problemFields.length] = element.id;
         }

         else if (element.range && isValidRange(element.value, element.range) == false) {
            problemFields[problemFields.length] = element.id;
         }
         
         // pattern (credit card number, email address, zip or postal code, alphanumeric, numeric)
         else if (element.pattern) {
            if ( ( (element.pattern.toLowerCase() == 'visa' || element.pattern.toLowerCase() == 'mastercard' || element.pattern.toLowerCase() == 'american express' || element.pattern.toLowerCase() == 'diners club' || element.pattern.toLowerCase() == 'discover' || element.pattern.toLowerCase() == 'enroute' || element.pattern.toLowerCase() == 'jcb' || element.pattern.toLowerCase() == 'credit card') && isValidCreditCard(element.value, element.pattern) == false) ||
                  (element.pattern.toLowerCase() == 'email' && isValidEmailStrict(element.value) == false) ||
                  (element.pattern.toLowerCase() == 'zip or postal code' && isValidZipcode(element.value) == false && isValidPostalcode(element.value) == false) ||
                  (element.pattern.toLowerCase() == 'zipcode' && isValidZipcode(element.value) == false) ||
                  (element.pattern.toLowerCase() == 'postal code' && isValidPostalcode(element.value) == false) ||
                  (element.pattern.toLowerCase() == 'us phone number' && 
                     ( (element.prefix && element.suffix && isValidUSPhoneNumber(element.value, form[element.prefix].value, form[element.suffix].value) == false) || 
                        (!element.prefix && !element.suffix && isValidUSPhoneNumber(element.value) == false) ) ) ||
                  (element.pattern.toLowerCase() == 'alphanumeric' && isAlphanumeric(element.value, true) == false) ||
                  (element.pattern.toLowerCase() == 'numeric' && isNumeric(element.value, true) == false) ||
                  (element.pattern.toLowerCase() == 'alphabetic' && isAlphabetic(element.value, true) == false) ) {
               problemFields[problemFields.length] = element.id;
            }
         }
      }
      
      // password 
      else if (element.type == "password") {
         
         // required element
         if (element.required  && element.value == '') {
            problemFields[problemFields.length] = element.id;
         }
         
         // maximum length
         else if (element.maxlength && isValidLength(element.value, 0, element.maxlength) == false) {
            problemFields[problemFields.length] = element.id;
         }

         // minimum length
         else if (element.minlength && isValidLength(element.value, element.minlength, Number.MAX_VALUE) == false) {
            problemFields[problemFields.length] = element.id;
         }
      }
      
      // file upload
      if (element.type == "file") {
         
         // required element
         if (element.required  && element.value == '') {
            problemFields[problemFields.length] = element.id;
         }
      }
      
      // select
      else if (element.type == "select-one" || element.type == "select-multiple" || element.type == "select") {

         // required element
         if (element.required && element.selectedIndex == -1) {
            problemFields[problemFields.length] = element.id;
         }
         
         // disallow empty value selection
         else if (element.disallowEmptyValue && element.options[element.selectedIndex].value == '') {
            problemFields[problemFields.length] = element.id;
         }

      }
      
      // radio buttons
      else if (element.type == "radio") {
         var radiogroup = form.elements[element.name];
         
         // required element
         if (radiogroup.required && radiogroup.length) {
            var checkedRadioButton = -1;
            for (var radioIndex = 0; radioIndex < radiogroup.length; radioIndex++) {
               if (radiogroup[radioIndex].checked == true) {
                  checkedRadioButton = radioIndex;
                  break;
               }
            }
            if (checkedRadioButton == -1 && !radiogroup.tested) {
               problemFields[problemFields.length] = radiogroup.id;
               radiogroup.tested = true;
            }
         }
         
         radiogroup = null;
      }
   }
   
    return problemFields;
}


/*
* --------------- end -----------------------< SPECIAL MOD FOR FIELD HIGHLIGHTING 
*/





// Check that the number of characters in a string is between a max and a min
function isValidLength(string, min, max) {
    if (string.length < min || string.length > max) return false;
    else return true;
}

// Check that the number is in a range

function isValidRange(string, range) {
//    if (string.replace) 
//        string=string.replace(/\t/gi, " ").replace(/^(\s|\t)*/gi, "").replace(/(\s|\t)*$/gi, "").replace(/^-*\s*/, "");
//    if (string.match) if (string.match(/\D/)) return false;
//    string=0+string;
//    range=0+range;
//    if (string >= range) return false;
//    else 
return true;
}
  
// Check that a credit card number is valid based using the LUHN formula (mod10 is 0)
function isValidCreditCard(number) {
    number = '' + number;
    
    if (number.length > 16 || number.length < 13 ) return false;
    else if (getMod10(number) != 0) return false;
    else if (arguments[1]) {
        var type = arguments[1];
        var first2digits = number.substring(0, 2);
        var first4digits = number.substring(0, 4);
        
        if (type.toLowerCase() == 'visa' && number.substring(0, 1) == 4 &&
            (number.length == 16 || number.length == 13 )) return true;
        else if (type.toLowerCase() == 'mastercard' && number.length == 16 &&
            (first2digits == '51' || first2digits == '52' || first2digits == '53' || first2digits == '54' || first2digits == '55')) return true;
        else if (type.toLowerCase() == 'american express' && number.length == 15 && 
            (first2digits == '34' || first2digits == '37')) return true;
        else if (type.toLowerCase() == 'diners club' && number.length == 14 && 
            (first2digits == '30' || first2digits == '36' || first2digits == '38')) return true;
        else if (type.toLowerCase() == 'discover' && number.length == 16 && first4digits == '6011') return true;
        else if (type.toLowerCase() == 'enroute' && number.length == 15 && 
            (first4digits == '2014' || first4digits == '2149')) return true;
        else if (type.toLowerCase() == 'jcb' && number.length == 16 &&
            (first4digits == '3088' || first4digits == '3096' || first4digits == '3112' || first4digits == '3158' || first4digits == '3337' || first4digits == '3528')) return true;
        
    // if the above card types are all the ones that the site accepts, change the line below to 'else return false'
    else return true;
    }
    else return true;
}

// Check that an email address is valid based on RFC 821 (?)
function isValidEmail(address) {
    if (address != '' && address.search) {
      if (address.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1) return true;
      else return false;
    }
    
   // allow empty strings to return true - screen these with either a 'required' test or a 'length' test
   else return true;
}

// Check that an email address has the form something@something.something
// This is a stricter standard than RFC 821 (?) which allows addresses like postmaster@localhost
function isValidEmailStrict(address) {
    if (isValidEmail(address) == false) return false;
    var domain = address.substring(address.indexOf('@') + 1);
    if (domain.indexOf('.') == -1) return false;
    if (domain.indexOf('.') == 0 || domain.indexOf('.') == domain.length - 1) return false;
    return true;
}

// Check that a web address has the form http://www.something.com, or something.somethingelse.com/eprst.html
/* problems
function isValidWebAddress(address) {
    if ( address.match(/^http:\/\/(www.)?([\d\w-]+.)+[\w]{2,5}\/?(([\w\d\s?%&=_-.]+)+\/?)*(.[\w\d])*$/) ) return true;
    //$/) ) return true;
    else return false;
}
*/

// Check that a US zip code is valid
function isValidZipcode(zipcode) {
    zipcode = removeSpaces(zipcode);
    if (!(zipcode.length == 5 || zipcode.length == 9 || zipcode.length == 10)) return false;
   if ((zipcode.length == 5 || zipcode.length == 9) && !isNumeric(zipcode)) return false;
   if (zipcode.length == 10 && zipcode.search && zipcode.search(/^\d{5}-\d{4}$/) == -1) return false;
   return true;
}

// Check that a Canadian postal code is valid
function isValidPostalcode(postalcode) {
    if (postalcode.search) {
        postalcode = removeSpaces(postalcode);
        if (postalcode.length == 6 && postalcode.search(/^[a-zA-Z]\d[a-zA-Z]\d[a-zA-Z]\d$/) != -1) return true;
        else if (postalcode.length == 7 && postalcode.search(/^[a-zA-Z]\d[a-zA-Z]-\d[a-zA-Z]\d$/) != -1) return true;
        else return false;
    }
    return true;
}

// Check that a US or Canadian phone number is valid
function isValidUSPhoneNumber(areaCode, prefixNumber, suffixNumber) {
   if (arguments.length == 1) {
      var phoneNumber = arguments[0];
      phoneNumber = phoneNumber.replace(/\D+/g, '');
      var length = phoneNumber.length;
      if (phoneNumber.length >= 7) {
         var areaCode = phoneNumber.substring(0, length-7);
         var prefixNumber = phoneNumber.substring(length-7, length-4);
         var suffixNumber = phoneNumber.substring(length-4);
      }
      else return false;
   }
   else if (arguments.length == 3) {
      var areaCode = arguments[0];
      var prefixNumber = arguments[1];
      var suffixNumber = arguments[2];
   }
   else return true;

   if (areaCode.length != 3 || !isNumeric(areaCode) || prefixNumber.length != 3 || !isNumeric(prefixNumber) || suffixNumber.length != 4 || !isNumeric(suffixNumber)) return false;
   return true;
}

// Check that a string contains only letters and numbers
function isAlphanumeric(string, ignoreWhiteSpace) {
    if (string.search) {
        if ((ignoreWhiteSpace && string.search(/[^\w\s]/) != -1) || (!ignoreWhiteSpace && string.search(/\W/) != -1)) return false;
    }
    return true;
}

// Check that a string contains only letters
function isAlphabetic(string, ignoreWhiteSpace) {
    if (string.search) {
        if ((ignoreWhiteSpace && string.search(/[^a-zA-Z\s]/) != -1) || (!ignoreWhiteSpace && string.search(/[^a-zA-Z]/) != -1)) return false;
    }
    return true;
}

// Check that a string contains only numbers
function isNumeric(string, ignoreWhiteSpace) {
    if (string.search) {
        if ((ignoreWhiteSpace && string.search(/[^\d\s]/) != -1) || (!ignoreWhiteSpace && string.search(/\D/) != -1)) return false;
    }
    return true;
}

// Remove characters that might cause security problems from a string 
function removeBadCharacters(string) {
    if (string.replace) {
        string.replace(/[<>\"\'%;\)\(&\+]/, '');
    }
    return string;
}

// Remove all spaces from a string
function removeSpaces(string) {
    var newString = '';
    for (var i = 0; i < string.length; i++) {
        if (string.charAt(i) != ' ') newString += string.charAt(i);
    }
    return newString;
}

// Remove leading and trailing whitespace from a string
function trimWhitespace(string) {
    var newString  = '';
    var substring  = '';
    beginningFound = false;
    
    // copy characters over to a new string
    // retain whitespace characters if they are between other characters
    for (var i = 0; i < string.length; i++) {
        
        // copy non-whitespace characters
        if (string.charAt(i) != ' ' && string.charCodeAt(i) != 9) {
            
            // if the temporary string contains some whitespace characters, copy them first
            if (substring != '') {
                newString += substring;
                substring = '';
            }
            newString += string.charAt(i);
            if (beginningFound == false) beginningFound = true;
        }
        
        // hold whitespace characters in a temporary string if they follow a non-whitespace character
        else if (beginningFound == true) substring += string.charAt(i);
    }
    return newString;
}

// Returns a checksum digit for a number using mod 10
function getMod10(number) {
    
    // convert number to a string and check that it contains only digits
    // return -1 for illegal input
    number = '' + number;
    number = removeSpaces(number);
    if (!isNumeric(number)) return -1;
    
    // calculate checksum using mod10
    var checksum = 0;
    for (var i = number.length - 1; i >= 0; i--) {
        var isOdd = ((number.length - i) % 2 != 0) ? true : false;
        digit = number.charAt(i);
        
        if (isOdd) checksum += parseInt(digit);
        else {
            var evenDigit = parseInt(digit) * 2;
            if (evenDigit >= 10) checksum += 1 + (evenDigit - 10);
            else checksum += evenDigit;
        }
    }
    return (checksum % 10);
}

function getReport(errors)
{
    var errorMessage = '';
    if( errors.length > 0 ){
        errorMessage = 'The form was not submitted due to the following problem' + ((errors.length > 1) ? 's' : '') + ':\n\n';
        for( var errorIndex = 0; errorIndex < errors.length; errorIndex++ ){
            errorMessage += '* ' + errors[errorIndex] + '\n';
        }
        errorMessage += '\nPlease correct ' + ((errors.length > 1) ? 'these' : 'this') + ' problem' + ((errors.length > 1) ? 's' : '') + ' and try again.';
    }
    return errorMessage;
}


//////////////////////

function freeValidatedFields(form)
{
 for (var i=0; form[i]; i++) form[i].required=false;
}