// ----------------------------------------------------------------------
// Javascript form validation routines.
// Author: Stephen Poley
//
// 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
// ----------------------------------------------------------------------

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", "Richiesto");  
      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", "Non corretto");
    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", "Controlla");
  else
    msg (infofield, "warn", "");
  return true;
}


function validateDate  (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 minYear = formatDate(new Date(),"yyyy"); 
 var maxYear = 2020
 var errorMsg = ""; 
 // regular expression to match required date format 
 re = /^(\d{1,2})\/(\d{1,2})\/(\d{4})$/; 
 if(valfield.value != '') { 
	if(regs = valfield.value.match(re)) {
		if(regs[1] < 1 || regs[1] > 31) { errorMsg = "Valore giorno non corretto"; } 
		else if(regs[2] < 1 || regs[2] > 12) { errorMsg = "Valore mese non corretto "; } 
		else if(regs[2] == 2 && regs[1] > 29) { errorMsg = "Valore giorno non corretto "; }
		else if(regs[2] == 2 && regs[1] > 28 && (!(regs[3]%4 == 0) || (regs[3]%400 == 0))) { errorMsg = "Valore giorno non corretto "; }  
		else if(regs[3] < minYear || regs[3] > maxYear) { errorMsg = "Valore anno non consentito"; } 
	} 
	else { errorMsg = "Formato: gg/mm/yyyy " } 
 } 
 if(errorMsg != "") { 
 msg (infofield, "error", errorMsg);
 setfocus(valfield);
 return false; 
 }
 else{
    msg (infofield, "warn", "");
  return true;
}
}


function checkDate(field, infofield) { 
}

function validateDate2   (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 minYear = formatDate(new Date(),"yyyy"); 
 var maxYear = 2020
 var errorMsg = ""; 
 // regular expression to match required date format 
 re = /^(\d{1,2})\/(\d{1,2})\/(\d{4})$/; 
 if(valfield.value != '') { 
	if(regs = valfield.value.match(re)) {
		if(regs[1] < 1 || regs[1] > 31) { errorMsg = "Valore giorno non corretto"; } 
		else if(regs[2] < 1 || regs[2] > 12) { errorMsg = "Valore mese non corretto "; } 
		else if(regs[2] == 2 && regs[1] > 29) { errorMsg = "Valore giorno non corretto "; }
		else if(regs[2] == 2 && regs[1] > 28 && (!(regs[3]%4 == 0) || (regs[3]%400 == 0))) { errorMsg = "Valore giorno non corretto "; }  
		else if(regs[3] < minYear || regs[3] > maxYear) { errorMsg = "Valore anno non consentito"; } 
	} 
	else { errorMsg = "Formato: gg/mm/yyyy " } 
 } 
 if(errorMsg != "") { 
 msg (infofield, "error", errorMsg);
 setfocus(valfield);
 return false; 
 }
 else{
    msg (infofield, "warn", "");
  return true;
}
}

//function validateDates  (valfield,   // element to be validated
//                         infofield,  // id of element to receive info/error msg
//						 valfield2,   // element to be validated
//                         infofield2,  // id of element to receive info/error msg
//                         required)   // true if required)   // true if required
//{
// if ((emptyString.test(valfield1.value)) && (emptyString.test(valfield2.value)) && required) return false;
// if ((emptyString.test(valfield1.value)) && (emptyString.test(valfield2.value)) && !required) return true;

// stat = validateDate (valfield, infofield, true);
// stat2 = validateDate (valfield2, infofield2, true);
// if (stat && stat2) { 
//	re = /^(\d{1,2})\/(\d{1,2})\/(\d{4})$/; 
//	if(regs = valfield.value.match(re)) {
//		date1 = new Date();
//		date1.setDate(regs[1]);
//		date1.setMonth(regs[2]);
//		date1.setFullYear(regs[3]);
//	}
//	if(regs2 = valfield2.value.match(re)) {
//		date2 = new Date();
//		date2.setDate(regs2[1]);
//		date2.setMonth(regs2[2]);
//		date2.setFullYear(regs2[3]);
//	}
//	if (date2<=date1) {
//    msg (infofield, "warn", "");
//	return true;}
//	else {
//	 msg (infofield, "error", "Data di arrivo precedente la partenza");
//	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", "Non corretto");
    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", "Controlla");
    setfocus(valfield);
    return false;
  }

  if (numdigits>14)
    msg (infofield, "warn", "Controlla");
  else { 
    if (numdigits<10)
      msg (infofield, "warn", "Controlla");
    else
      msg (infofield, "warn", "");
  }
  return true;
}