// ----------------------------------------------------------------------
// 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", "ERROR: required");
      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", "ERROR: not a valid e-mail address");
    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", "Unusual e-mail address - check if correct");
  else
    msg (infofield, "warn", "");
  return true;
}


// --------------------------------------------
//            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<7)
      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;
}

function IntFrc(frc) {
    if (frc % 1 >= 0.5) {
        frc++;
    }
    return frc | 0;
}

function CORE(X, N) {
    //return 12;
    var int = Math.floor(X), frc = ((X - int) + 1) * Math.pow(10, N);
    frc = String(IntFrc(frc));
    return (int + +(frc.charAt(0) == "2")) + "." + frc.substring(1);
}


function calcAll()
{
var reg = document.getElementById("registrations")
    if (reg) {
            document.getElementById("registrations").onchange();
            document.getElementById("vex").onchange();
            document.getElementById("shirts").onchange();
            document.getElementById("hamburger").onchange();
            document.getElementById("cheeseburger").onchange();
            document.getElementById("veggieburger").onchange();
            document.getElementById("hotdog").onchange();
  //          document.getElementById("dinner_veggie").onchange();
    //        document.getElementById("lunch_turkey").onchange();
       //     document.getElementById("lunch_beef").onchange();
         //   document.getElementById("lunch_ham").onchange();
         //   document.getElementById("lunch_veg").onchange();
    }

}

// --------------------------------------------
//               adjustTotal
// Add surcharge if paypal is selected
// --------------------------------------------

function adjustTotal()  // id of element to receive total
{
    var subtotal = document.getElementById("subtotal");
    var total = document.getElementById("total");
    var usepaypal = document.getElementById("paypal");
//    var numvex = document.getElementById("vex");
    var numfrc = document.getElementById("registrations");

    var t = subtotal.value;

// No vex frc combo discount this year
//    if (numvex != null && numfrc != null)
//
//    	if ((numvex.value > 0 ) && (numfrc.value > 0))
//    		t = t - 25;

// Paypal disabled!
//    if (usepaypal.checked) t = (1.019*t);
    t = CORE(t, 2);
    total.value = t;
    return true;
}


// --------------------------------------------
//               totalRow
// Calculate # x price and write total
// Returns true if so (and also if could not be executed because of old browser)
// --------------------------------------------

function totalRow(nfield,   // element to be validated
                    price,
                    rowtotfield)  // id of element to receive total
{
    //var stat = commonCheck (valfield, totfield, false);
    //if (stat != proceed) return stat;

    var n = trim(nfield.value);  // number of items purchased
    if (n == '') n = 0;
    var rowtot = document.getElementById(rowtotfield);
    var crowtot = trim(rowtot.value); // if row total has some current value
    var valRE = /^[0-9,.]{1,4}$/;
    var subtotal = document.getElementById("subtotal");
    var total = document.getElementById("total");
    var usepaypal = document.getElementById("paypal");

    if (!valRE.test(crowtot)) {
        currtot = 1*0;
    } else if (crowtot == n*price) {
        currtot = 1*0;
    } else {
        currtot = 1*crowtot;
    }
    subtotal.value = (1*subtotal.value) - (1*currtot);

    if (!valRE.test(n)) {
        rowtot.value = "ERROR";
        //msg (totfield, "error", "ERROR");
        setfocus(nfield);
        return false;
    x
    } else if (n == 0) {
        rowtot.value = '';
        adjustTotal();
        return true;
    } else {
        rowtot.value = n*price;
        var s = (1*subtotal.value) + (1*rowtot.value);
        subtotal.value = (1*s);

        adjustTotal();
        return true;
    }
}

window.onload = calcAll;