// ----------------------------------------------------------------------
// Javascript form validation routines.
// Author: Stephen Poley
// Revisions&Additions: Jakub Sovina
//
// Simple routines to quickly pick up obvious typos.
// All validation routines return true if executed by an older browser:
// in this case validation must be left to the server.
//
// Update Jun 2005: discovered that reason IE wasn't setting focus was
// due to an IE timing bug. Added 0.1 sec delay to fix.
//
// Update Oct 2005: minor tidy-up: unused parameter removed
//
// Update Jun 2006: minor improvements to variable names and layout
//
// Update Jul 2006: additional validation functions (Jakub Sovina)
// ----------------------------------------------------------------------

var nbsp = 160;		// non-breaking space char
var node_text = 3;	// DOM text node-type
var emptyString = /^\s*$/ ;
var global_valfield;	// retain valfield for timer thread

// --------------------------------------------
//                  trim
// Trim leading/trailing whitespace off string
// --------------------------------------------

function trim(str)
{
  return str.replace(/^\s+|\s+$/g, '');
}


// --------------------------------------------
//                  setfocus
// Delayed focus setting to get around IE bug
// --------------------------------------------

function setFocusDelayed()
{
  global_valfield.focus();
}

function setfocus(valfield)
{
  // save valfield in global variable so value retained when routine exits
  global_valfield = valfield;
  setTimeout( 'setFocusDelayed()', 100 );
}


// --------------------------------------------
//                  msg
// Display warn/error message in HTML element.
// commonCheck routine must have previously been called
// --------------------------------------------

function msg(fld,     // id of element to display message in
             msgtype, // class to give element ("warn" or "error")
             message) // string to display
{
  // setting an empty string can give problems if later set to a 
  // non-empty string, so ensure a space present. (For Mozilla and Opera one could 
  // simply use a space, but IE demands something more, like a non-breaking space.)
  var dispmessage;
  if (emptyString.test(message)) 
    dispmessage = String.fromCharCode(nbsp);    
  else  
    dispmessage = message;

  var elem = document.getElementById(fld);
  elem.firstChild.nodeValue = dispmessage;  
  
  elem.className = msgtype;   // set the CSS class to adjust appearance of message
}

// --------------------------------------------
//            commonCheck
// Common code for all validation routines to:
// (a) check for older / less-equipped browsers
// (b) check if empty fields are required
// Returns true (validation passed), 
//         false (validation failed) or 
//         proceed (don't know yet)
// --------------------------------------------

var proceed = 2;  

function commonCheck    (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  if (!document.getElementById) 
    return true;  // not available on this browser - leave validation to the server
  var elem = document.getElementById(infofield);
  if (!elem.firstChild) return true;  // not available on this browser 
  if (elem.firstChild.nodeType != node_text) return true;  // infofield is wrong type of node  

  if (emptyString.test(valfield.value)) {
    if (required) {
      msg (infofield, "error", "!!!");  
      setfocus(valfield);
      return false;
    }
    else {
      msg (infofield, "warn", "");   // OK
      return true;  
    }
  }
  return proceed;
}

// --------------------------------------------
//            validatePresent
// Validate if something has been entered
// Returns true if so 
// --------------------------------------------

function validatePresent(valfield,   // element to be validated
                         infofield ) // id of element to receive info/error msg
{
  var stat = commonCheck (valfield, infofield, true);
  if (stat != proceed) return stat;

  msg (infofield, "warn", "");  
  return true;
}

// --------------------------------------------
//               validateEmail
// Validate if e-mail address
// Returns true if so (and also if could not be executed because of old browser)
// --------------------------------------------

function validateEmail  (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var tfld = trim(valfield.value);  // value of field with whitespace trimmed off
  var email = /^[^@]+@[^@.]+\.[^@]*\w\w$/  ;
  if (!email.test(tfld)) {
    msg (infofield, "error", "!!!");
    setfocus(valfield);
    return false;
  }

  var email2 = /^[A-Za-z][\w.-]+@\w[\w.-]+\.[\w.-]*[A-Za-z][A-Za-z]$/  ;
  if (!email2.test(tfld)) 
    msg (infofield, "warn", "!");
  else
    msg (infofield, "warn", "");
  return true;
}

// --------------------------------------------
// validateDate    (Jakub Sovina)
// Validates date in the following format: yyyy-mm-dd
// --------------------------------------------

function validDate (valfield, infofield, required)

{

var stat = commonCheck (valfield, infofield, required);
if (stat != proceed) return stat;

var checkstr = "0123456789";
var DateField = valfield;
var Datevalue = "";
var DateTemp = "";
var seperator = "-";
var day;
var month;
var year;
var leap = 0;
var err = 0;
var i;
   err = 0;
   DateValue = DateField.value;
   /* Delete all chars except 0..9 */
   for (i = 0; i < DateValue.length; i++) {
	  if (checkstr.indexOf(DateValue.substr(i,1)) >= 0) {
	     DateTemp = DateTemp + DateValue.substr(i,1);
	  }
   }
   DateValue = DateTemp;
   
//	if ((Datevalue.substr(4.1)<>separator) || (Datevalue.substr(7.1)<>separator)) {
//	  err=17;}

   if (DateValue.length != 8) {
      err = 18;}
   /* year is wrong if year = 0000 */
   year = DateValue.substr(0,4);
   if (year == 0) {
      err = 19;}
      
//   if (year < 2006) {
//      err = 20;}
      
   /* Validation of month*/
   month = DateValue.substr(4,2);
   if ((month < 1) || (month > 12)) {
      err = 21;
   }
   
   /* Validation of day*/
   day = DateValue.substr(6,2);
   if (day < 1) {
     err = 22;
   }
   /* Validation leap-year / february / day */
   if ((year % 4 == 0) || (year % 100 == 0) || (year % 400 == 0)) {
      leap = 1;
   }
   if ((month == 2) && (leap == 1) && (day > 29)) {
      err = 23;
   }
   if ((month == 2) && (leap != 1) && (day > 28)) {
      err = 24;
   }
   /* Validation of other months */
   if ((day > 31) && ((month == "01") || (month == "03") || (month == "05") || (month == "07") || (month == "08") || (month == "10") || (month == "12"))) {
      err = 25;
   }
   if ((day > 30) && ((month == "04") || (month == "06") || (month == "09") || (month == "11"))) {
      err = 26;
   }
   /* if 00 ist entered, no error, deleting the entry */
   if ((day == 0) && (month == 0) && (year == 00)) {
      err = 27; day = "01"; month = "01"; year = "2006"; seperator = "-";
   }
   /* if no error, write the completed date to Input-Field (e.g. 13.12.2001) */
   if (err == 0) {
      DateField.value = year + seperator + month + seperator + day;
      msg (infofield, "warn", "");  
	  return true;
   }
   /* Error-message if err != 0 */
   else {
	    msg (infofield, "error", "!!!");
    	setfocus(valfield);
	    return false;
   }
}


// --------------------------------------------
// validateCCExpir    (Jakub Sovina)
// Validates date in the following format: mm/yy
// --------------------------------------------

function validCCExpir (valfield, infofield, required)

{

var stat = commonCheck (valfield, infofield, required);
if (stat != proceed) return stat;

var checkstr = "0123456789";
var DateField = valfield;
var Datevalue = "";
var DateTemp = "";
var seperator = "/";
var month;
var year;
var err = 0;
var i;
   err = 0;
   DateValue = DateField.value;
   /* Delete all chars except 0..9 */
   for (i = 0; i < DateValue.length; i++) {
	  if (checkstr.indexOf(DateValue.substr(i,1)) >= 0) {
	     DateTemp = DateTemp + DateValue.substr(i,1);
	  }
   }
   DateValue = DateTemp;
   
   if (DateValue.length != 4) {
      err = 18;}
   /* year is wrong if year = 0000 */
   year = DateValue.substr(2,2);
   if (year == 0) {
      err = 19;}
      
   if (year > 20 || year < 6) {
      err = 20;}

   /* Validation of month*/
   month = DateValue.substr(0,2);
   if ((month < 1) || (month > 12)) {
      err = 21;
   }

   /* if 00 ist entered, no error, deleting the entry */
   if ((month == 0) && (year == 00)) {
      err = 22; month = "01"; year = "07"; seperator = "/";
   }
   /* if no error, write the completed date to Input-Field (e.g. 13.12.2001) */
   if (err == 0) {
      DateField.value = month + seperator + year;
      msg (infofield, "warn", "");  
	  return true;
   }
   /* Error-message if err != 0 */
   else {
	    msg (infofield, "error", "!!!");
    	setfocus(valfield);
	    return false;
   }
}




// --------------------------------------------
// validateNumber    (Jakub Sovina)
// Validates number within a specified range
// --------------------------------------------

function validNum (valfield, infofield, required, minval, maxval)

{

var stat = commonCheck (valfield, infofield, required);
if (stat != proceed) return stat;

var checkstr = "0123456789";
var NumField = valfield;
var Numvalue = "";
var NumTemp = "";
var MinValue = minval;
var MaxValue = maxval;
var err = 0;
var i;
   err = 0;
   NumValue = NumField.value;
   /* Delete all chars except 0..9 */
   for (i = 0; i < NumValue.length; i++) {
	  if (checkstr.indexOf(NumValue.substr(i,1)) >= 0) {
	     NumTemp = NumTemp + NumValue.substr(i,1);
	  }
   }
   NumValue = NumTemp;

   if (NumValue.length < 1) {
      err = 18;}

   if (NumValue < MinValue) {
      err = 19;}
      
   if (NumValue > MaxValue) {
      err = 20;}

   /* if no error, write the completed number to Input-Field */
   if (err == 0) {
      NumField.value = NumValue;
      msg (infofield, "warn", "");  
	  return true;
   }
   /* Error-message if err != 0 */
   else {
	    msg (infofield, "error", "!!!");
    	setfocus(valfield);
	    return false;
   }
}


// --------------------------------------------
//            validateCCNr
// Validate credit card number (simple)  v2.1
// Returns true if so (and also if could not be executed because of old browser)
// Created by: David Leppek :: https://www.azcode.com/Mod10
// Modified by: Jakub Sovina 
// --------------------------------------------

function validateCCNr(valfield, infofield, required) 
{  

	var stat = commonCheck (valfield, infofield, required);
	if (stat != proceed) return stat;

	var ccNumb = valfield.value;
	var valid = "0123456789"  // Valid digits in a credit card number
	var len = ccNumb.length;  // The length of the submitted cc number
	var iCCN = parseInt(ccNumb);  // integer of ccNumb
	var sCCN = ccNumb.toString();  // string of ccNumb
	sCCN = sCCN.replace (/^\s+|\s+$/g,'');  // strip spaces
	var iTotal = 0;  // integer total set at zero
	var bNum = true;  // by default assume it is a number
	var bResult = false;  // by default assume it is NOT a valid cc
	var temp;  // temp variable for parsing string
	var calc;  // used for calculation of each digit

	// Determine if the ccNumb is in fact all numbers
	for (var j=0; j<len; j++) {
	  temp = "" + sCCN.substring(j, j+1);
	  if (valid.indexOf(temp) == "-1"){bNum = false;}
	}

	// if it is NOT a number, you can either alert to the fact, or just pass a failure
	if(!bNum){
	  /*alert("Not a Number");*/bResult = false;
	}

	// Determine if it is the proper length 
	if((len == 0)&&(bResult)){  // nothing, field is blank AND passed above # check
	  bResult = false;
	} else{  // ccNumb is a number and the proper length - let's see if it is a valid card number
	  if(len >= 15){  // 15 or 16 for Amex or V/MC
	    for(var i=len;i>0;i--){  // LOOP throught the digits of the card
	      calc = parseInt(iCCN) % 10;  // right most digit
	      calc = parseInt(calc);  // assure it is an integer
	      iTotal += calc;  // running total of the card number as we loop - Do Nothing to first digit
	      i--;  // decrement the count - move to the next digit in the card
	      iCCN = iCCN / 10;                               // subtracts right most digit from ccNumb
	      calc = parseInt(iCCN) % 10 ;    // NEXT right most digit
	      calc = calc *2;                                 // multiply the digit by two
	      // Instead of some screwy method of converting 16 to a string and then parsing 1 and 6 and then adding them to make 7,
	      // I use a simple switch statement to change the value of calc2 to 7 if 16 is the multiple.
	      switch(calc){
	        case 10: calc = 1; break;       //5*2=10 & 1+0 = 1
	        case 12: calc = 3; break;       //6*2=12 & 1+2 = 3
	        case 14: calc = 5; break;       //7*2=14 & 1+4 = 5
	        case 16: calc = 7; break;       //8*2=16 & 1+6 = 7
	        case 18: calc = 9; break;       //9*2=18 & 1+8 = 9
	        default: calc = calc;           //4*2= 8 &   8 = 8  -same for all lower numbers
	      }                                               
	    iCCN = iCCN / 10;  // subtracts right most digit from ccNum
	    iTotal += calc;  // running total of the card number as we loop
	  }  // END OF LOOP
	  if ((iTotal%10)==0){  // check to see if the sum Mod 10 is zero
	    bResult = true;  // This IS (or could be) a valid credit card number.
	  } else {
	    bResult = false;  // This could NOT be a valid credit card number
	    }
	  }
	}
	// return results
	if(bResult) {
		msg (infofield, "warn", "");  
		return true;
	}
	if(!bResult){
		msg (infofield, "error", "!!!");
    		setfocus(valfield);
		return false;
	}

}
	



// --------------------------------------------
//            validateTelnr
// Validate telephone number
// Returns true if so (and also if could not be executed because of old browser)
// Permits spaces, hyphens, brackets and leading +
// --------------------------------------------

function validateTelnr  (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var tfld = trim(valfield.value);  // value of field with whitespace trimmed off
  var telnr = /^\+?[0-9 ()-]+[0-9]$/  ;
  if (!telnr.test(tfld)) {
    msg (infofield, "error", "ERROR: not a valid telephone number. Characters permitted are digits, space ()- and leading +");
    setfocus(valfield);
    return false;
  }

  var numdigits = 0;
  for (var j=0; j<tfld.length; j++)
    if (tfld.charAt(j)>='0' && tfld.charAt(j)<='9') numdigits++;

  if (numdigits<6) {
    msg (infofield, "error", "ERROR: " + numdigits + " digits - too short");
    setfocus(valfield);
    return false;
  }

  if (numdigits>14)
    msg (infofield, "warn", numdigits + " digits - check if correct");
  else { 
    if (numdigits<10)
      msg (infofield, "warn", "Only " + numdigits + " digits - check if correct");
    else
      msg (infofield, "warn", "");
  }
  return true;
}

// --------------------------------------------
//             validateAge
// Validate person's age
// Returns true if OK 
// --------------------------------------------

function validateAge    (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var tfld = trim(valfield.value);
  var ageRE = /^[0-9]{1,3}$/
  if (!ageRE.test(tfld)) {
    msg (infofield, "error", "ERROR: not a valid age");
    setfocus(valfield);
    return false;
  }

  if (tfld>=200) {
    msg (infofield, "error", "ERROR: not a valid age");
    setfocus(valfield);
    return false;
  }

  if (tfld>110) msg (infofield, "warn", "Older than 110: check correct");
  else {
    if (tfld<7) msg (infofield, "warn", "Bit young for this, aren't you?");
    else        msg (infofield, "warn", "");
  }
  return true;
}