// To help debugging <pre><script type="text/javascript">

var orgNoRegexp = new RegExp("^[0-9]{6}-[0-9]{4}$");
var vatNoRegexp = new RegExp("^SE[0-9]{12}$");
var zipCodeRegexp = new RegExp("^[0-9]{3} ?[0-9]{2}$");
var phoneRegexp = new RegExp("^[0-9\+ \-]{5,20}$"); // 5 to 20 digits, dashes spaces and plus
var locationIdRegExp = new RegExp("^[0-9]{13}$");

/**
 * Check if country is Sweden
 */
function isSweden(countryId) {
  countryId = getCountryId(countryId); // Look up if not provided
  return (countryId == null) || // If no country on page assume Swedish
         (countryId == 'SE');
}

/**
 * Check if country is Denmark
 */
function isDenmark(countryId) {
  countryId = getCountryId(countryId); // Look up if not provided
  return (countryId == 'DK');
}

/**
 * Check if country is Denmark
 */
function isNorway(countryId) {
  countryId = getCountryId(countryId); // Look up if not provided
  return (countryId == 'NO');
}

function getCountryId(countryId) {
  if(countryId != null) // Country ID provided
    return countryId;
  var countryIdField = document.getElementById('country_id');
  if(countryIdField != null) { // If there was a country_id field
    trimField(countryIdField);
    return countryIdField.value;
  }
  else
    return null;
}

/**
 * Make sure the organisation number is valid
 */
function checkOrgNo(orgNoField)
{
  var countryId = 'SE'; // Assume SE (for forms without country_id)
  if($('vat_country_id') != null) { // There is a VAT country field
    countryId = $('vat_country_id').value; 
  }
  else if($('country_id') != null) { // If there was a country_id field
    countryId = $('country_id').value;
  }
  
  trimField(orgNoField);
  var orgNo = orgNoField.value;
  if(orgNo.length == 0)
    return;

  if(isSweden(countryId))
  {
    if(orgNo.match(orgNoRegexp) == null)
    {
      markField(orgNoField);

      alert("Ogiltigt organisationsnummer.\nFörväntat format är 123456-7890.");
      return false;
    }

    // Remove dash for modulus calculation
    var dashIndex = orgNo.indexOf('-');
    orgNo = orgNo.substr(0,dashIndex) + orgNo.substr( dashIndex+1, orgNo.length-dashIndex);

    if( ! checkModulus10(orgNo) )
    {
      alert('Ogiltigt organisationsnummer');
      markField(orgNoField);
      return false;
    }
  }
  else if(isDenmark(countryId))
  {
    // 8 digits, possibly grouped in 2 by -
    if(orgNo.match("^[0-9]{2}-?[0-9]{2}-?[0-9]{2}-?[0-9]{2}$") == null)
    {
      markField(orgNoField);
      alert('Ogiltigt organisationsnummer');
      return false;
    }

    if(! checkModulus11(orgNo) )
    {
      markField(orgNoField);
      alert('Ogiltigt organisationsnummer');
      return false;
    }
  }
  else if(isNorway(countryId))
  {
    // 8 digits, possibly grouped in 2 by -
    if(orgNo.match("^[0-9]{9}$") == null)
    {
      markField(orgNoField);
      alert('Ogiltigt organisationsnummer');
      return false;
    }
  }
  unmarkField(orgNoField);
  return true;
}


function checkVatNo()
{
  var countryId = null; // Assume vat_country_id
  if($('vat_country_id') != null) { // There is a VAT country field
    countryId = $('vat_country_id').value; 
  }
  var vatNoField = document.getElementById('vat_no');
  if(fieldIsBlank(vatNoField))
    return;

  if(! isSweden(countryId) || fieldHasAnyError(vatNoField)) // If not Sweden or already erronous
    return;

  if(vatNoField.value.match(vatNoRegexp) == null)
  {
    markField(vatNoField);
    alert('Ogiltigt momsregistreringsnummer.\nF\u00F6rv\u00E4ntat format \u00E4r SE f\u00F6ljt av 12 siffror.');
  }
}

function checkZipCode(event,zipCodeField)
{
  if(zipCodeField == null)
    zipCodeField = document.getElementById('zip_code');

  if(fieldIsBlank(zipCodeField))
    return;

  if(isSweden() && zipCodeField.value.match(zipCodeRegexp) == null) // If Sweden an does not match
  {
    markField(zipCodeField);
    alert('Ogiltigt postnummer.\nF\u00F6rv\u00E4ntat format \'123 45\' eller \'12345\'.');
    return eventReturn(event, false);
  }
  else if(isDenmark() && zipCodeField.value.match("^[0-9]{4}$") == null) // If Denmark an does not match
  {
    markField(zipCodeField);
    alert('Ogiltigt postnummer.\nF\u00F6rv\u00E4ntat format \'1234\'.');
    return eventReturn(event, false);
  }
  
  unmarkField(zipCodeField);
  return eventReturn(event, true); 
}

function checkPhone(theField)
{
  if(! isSweden() || fieldHasAnyError(theField)) // If not Sweden or already erronous
    return;

  if(theField.value.length == 0) // If not entered
    return; // Skip check (phone will be checked by requiredness)

  if(theField.value.match(phoneRegexp) == null)
  {
    markField(theField);
    alert('Ogiltigt telefonnummer.');
  }
}

/**
 * Chech bankgiro or postalgiro
 */
function checkGiro(giroField)
{
  trimField(giroField);
  var giro = giroField.value;

  // Make sure there are only digits, - and space
  var length = giro.length;
  if(length == 0)
    return;

  var actualLength = 0;

  for(i = 0; i < length; i++)
  {
    var c = giro.charAt(i);
    if( (c >= '0' && c <= '9') || c == ' ' || c == '-')
    {
      actualLength++;
    }
    else
    {
      alert('Ogiltigt gironummer');
      markField(giroField);
      return;
    }
  }

  var countryId = 'SE'; // Assume SE (for forms without country_id)
  if($('vat_country_id') != null) { // There is a VAT country field
    countryId = $('vat_country_id').value;
  }
  else if($('country_id') != null) { // If there was a country_id field
    countryId = $('country_id').value;
  }
  if(isSweden(countryId) || isNorway(countryId) || isDenmark(countryId)) {

    // Check length (according to old code)
    if(actualLength < 4)
    {
      alert('Ogiltigt gironummer');
      markField(giroField);
      return;
    }

    // Checksum
    if( ! checkModulus10(giro) )
    {
      alert('Ogiltigt gironummer');
      markField(giroField);
    }
  }
}

/**
 * Check the common modulus 10 checksum.
 * See se.exder.system.ExderUtils
 */
function checkModulus10(input)
{
  var factor = 1;
  var sum = 0;
  var length = input.length;

  for(i = length - 1; i >= 0; i--)
  {
    var c = input.charAt(i);
    if(c >= '0' && c <= '9')
    {
      var integer = (c - '0') * factor;
      if(integer < 10)
        sum += integer;
      else
        sum += integer - 9;
      // Alternative: sum += (integer/10) + (integer % 10);

      factor = 3 - factor; // 1 2 1 2 1 ...
    }
  }

  return (sum % 10 == 0);
}

/**
 * Check the common modulus 11 checksum
 * See http://docs.hp.com/en/32209-90024/apds02.html for more info
 */
function checkModulus11(input)
{
  var factor = 1; // Checksum factor is 1
  var sum = 0;
  var length = input.length;

  for(i = length - 1; i >= 0; i--)
  {
    var c = input.charAt(i);
    if(c >= '0' && c <= '9')
    {
      sum += (c - '0') * factor;
      // Find next factor 2, 3, 4, 5, 6, 7, 2, 3 ...
      if(factor == 7)
        factor = 2;
      else
        factor++;
    }
  }

  return (sum % 11 == 0);
}

function checkLocationId(locationIdField)
{
  if(fieldHasAnyError(locationIdField)) // If already erronous
    return;

  var locationId = locationIdField.value;
  if(locationId.match(locationIdRegExp) == null) // If no match
  {
    alert('Lokaliseringskoden m\u00E5ste best\u00E5 av 13 siffror');
    markField(locationIdField);
  }
  else
  {
	  var factor = 3;
	  var sum = 0;
	  for (var index = 12; index > 0; --index) {
		  sum += locationId.substring(index-1, index) * factor;
  		factor = 4 - factor;
	  }
	  var k = (1000 - sum) % 10;

    if(k != locationId.substring(12,13))
    {
      var errorMessage = "Checksiffran f\u00F6r {ean_number} \u00E4r felaktig. Korrekt checksiffra \u00E4r {correct_checksum}.".
                          replaceVar('ean_number',locationId).replaceVar('correct_checksum', k);
      alert(errorMessage);

      markField(locationIdField);
    }
  }
}

////////////////////////////////////////////////////////////////////////////////////////
// Functions for handling payee
////////////////////////////////////////////////////////////////////////////////////////

/**
 * This methods checks if a payee name is entered and returns true/false
 */
function payeeNameEntered()
{
  return ! fieldIsBlank(document.getElementById('payee_address_name'));
}


// To help debugging </script></pre>