var emptyFieldFound;
var emptyCheckboxFound;

/**
 * Highlights obligatory fields that have been left empty
 * Uses array that is defined in the parent page (index.php)
 */
function testEmptyFields() {
// ----------------------------------------------------------------------------
  emptyFieldFound = false;
  emptyCheckboxFound = false;
  with (document.booking_container) {
    for (var i = 0; i < elements.length; i++) {
      testOneEmptyField(elements[i], obligatoryFieldsBasic);

      re = /^people\[(\d+)\]\[/;
      matchArray = re.exec(elements[i].name);
      if (matchArray) {
        passengerNumber = matchArray[1];
        if ( (typeof otherNationChecked[passengerNumber] != 'undefined') && (otherNationChecked[passengerNumber]) )
          testOneEmptyField(elements[i], obligatoryFieldsI94['passenger_' + passengerNumber]);

        var email = document.getElementsByName('people['+passengerNumber+'][email]').item(0);
        var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
        if (!filter.test(email.value)) {
          alert('Please verify your e-mail address. It appears to be invalid.');
          return false;
        }
      }
    }
  }
  if (emptyCheckboxFound) {
    alert('You have to agree to the terms and conditions in order to be able to proceed.');
    return false;
  }
    
  if (emptyFieldFound) {
    alert('Please review fields that are marked with thick border. These are obligatory.');
    return false;
  } else {
    return true;
  }
}

function testOneEmptyField(element, obligatoryFields) {
// ----------------------------------------------------------------------------
  for (field in obligatoryFields) {
    /*
     * if the element is disabled it means we`ll get its value from elsewhere 
     */
    if ( (element.name == field) && (element.disabled == false) ) {
      markField(false, element);
      
      switch (obligatoryFields[field]) {
        case "radio":
/* too awkward to check and mark unselected radio buttons sets */
          break;
        case "checkbox":
          if (element.checked == false) {
            emptyCheckboxFound = true;
            return false;
          }
          break;
        case "select":
          if (element.selectedIndex == -1) {
            markField(true, element, false);
            return false;
          }
          break;
        case "textarea":
        case "text":
          if ( (element.value == '') || (element.value == 'yyyy-mm-dd') ) {
            markField(true, element, false);
            return false;
          }
          break;
      }
    }
  }
}

/**
 * Optional setBackground is for checkboxes that don`t have border
 */
function markField(state, element, setBackground) {
// ----------------------------------------------------------------------------
  if (state) {
    element.style.borderWidth = "3";
    /* pixels are understood */
    
    emptyFieldFound = true;
    
  } else {
  
    element.style.borderWidth = "1";
  }
}

var copyAttributes = new Array(
  "address","city","province","postal_code","phone","cell_phone","email","flight_airline_one","flight_number_one","flight_time_one","flight_airline_two","flight_number_two","flight_time_two");

function copyFirst(state, passengerId) {
// ----------------------------------------------------------------------------
  traverseElements(state, passengerId, copyAttributes);
}

function traverseElements(state, passengerId, arrayAttributes) {
// ----------------------------------------------------------------------------
  with (document.booking_container) {
    for (var i = 0; i < elements.length; i++) {
      firstSplit  = elements[i].name.indexOf('[');
      secondSplit = elements[i].name.indexOf('][');
      if (secondSplit) {
        // people[1][address] => address
        elementName = elements[i].name.substr(
          secondSplit + 2,
          elements[i].name.length - secondSplit - 3);
          
        // people[1][address] => 1
        elementPassengerId = elements[i].name.substr(
          firstSplit + 1,
          secondSplit - firstSplit - 1);

        if (passengerId == elementPassengerId) {
          for (var j = 0; j < arrayAttributes.length; j++) {
            if (elementName == arrayAttributes[j]) {
              /*
               * disable the element
               */
              elements[i].disabled = state;

              /*
               * change background to indicate write protection
               */
              if (state)
                elements[i].style.backgroundColor = "white";
              else
                elements[i].style.backgroundColor = "";

              /*
               * perform action on this element
               */
              switch (action) {
                case 'save':
                break;
                case 'copy':
                break;
              }
            }
          }
        }
      }
    }
  }
}

var userDataAttributes = new Array(
  "ticket_type", "first_name", "last_name", "address", "city", "province", "postal_code", "phone", "cell_phone", "email", "identification", "identification_type", "citizenship", "i94_citizenship", "i94_number", "i94_validity");

/*
 * If customer wants to use previously saved data we need to disable input fields that are not needed
 */ 
function disablePassengerFields(select, passengerId) {
// ----------------------------------------------------------------------------
  state = (select.selectedIndex != 0);
  traverseElements(state, passengerId, userDataAttributes);
}

function enableSubmitButton(enable) {
// ----------------------------------------------------------------------------
  if (enable) state = false;
    else state = true;

  var submitButtonElement = document.getElementById('submitButton');
  submitButtonElement.disabled = state;
}

var otherNationChecked = new Array();

/**
 * When customer changes selection for Citizenship this function hides or shows I94 input fields
 * that are relevant only to non US and non CA citizens
 */
function toggleCitizenship(passengerNumber) {
// ----------------------------------------------------------------------------
  element = getSelectedRadio('people['+passengerNumber+'][citizenship]');
  /*
   * Other Nation
   */
  if (element.value == 2) {
    visibility = '';
    otherNationChecked[passengerNumber] = true;
  } else {
    visibility = 'none';
    otherNationChecked[passengerNumber] = false;
  }
    
  otherNationAttributes = new Array('i94','i94_citizenship','i94_number','i94_validity');
  for (var i = 0; i < otherNationAttributes.length; i++) {
    toggleElement = document.getElementById(passengerNumber + '_' + otherNationAttributes[i]);
    toggleElement.style.display = visibility;
  }
}


function getSelectedRadio(groupName) {
// ----------------------------------------------------------------------------
  groupElements = document.getElementsByName(groupName);
  if (groupElements[0]) {
    for (var i=0; i<groupElements.length; i++) {
      if (groupElements[i].checked) {
        return groupElements[i];
      }
    }
  } else {
    if (groupElements.checked) { return groupElements; }
  }
  return -1;
}