[civicrm-core.git] / CRM / Event / Form / Registration / Register.php

<?php
/*
 +--------------------------------------------------------------------+
 | CiviCRM version 4.3                                                |
 +--------------------------------------------------------------------+
 | Copyright CiviCRM LLC (c) 2004-2013                                |
 +--------------------------------------------------------------------+
 | This file is a part of CiviCRM.                                    |
 |                                                                    |
 | CiviCRM is free software; you can copy, modify, and distribute it  |
 | under the terms of the GNU Affero General Public License           |
 | Version 3, 19 November 2007 and the CiviCRM Licensing Exception.   |
 |                                                                    |
 | CiviCRM is distributed in the hope that it will be useful, but     |
 | WITHOUT ANY WARRANTY; without even the implied warranty of         |
 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.               |
 | See the GNU Affero General Public License for more details.        |
 |                                                                    |
 | You should have received a copy of the GNU Affero General Public   |
 | License and the CiviCRM Licensing Exception along                  |
 | with this program; if not, contact CiviCRM LLC                     |
 | at info[AT]civicrm[DOT]org. If you have questions about the        |
 | GNU Affero General Public License or the licensing of CiviCRM,     |
 | see the CiviCRM license FAQ at http://civicrm.org/licensing        |
 +--------------------------------------------------------------------+
*/

/**
 *
 *
 * @package CRM
 * @copyright CiviCRM LLC (c) 2004-2013
 * $Id$
 *
 */

/**
 * This class generates form components for processing Event
 *
 */
class CRM_Event_Form_Registration_Register extends CRM_Event_Form_Registration {

  /**
   * The fields involved in this page
   *
   */
  public $_fields;

  /**
   * The defaults involved in this page
   *
   */
  public $_defaults;

  /**
   * The status message that user view.
   *
   */
  protected $_waitlistMsg = NULL;
  protected $_requireApprovalMsg = NULL;

  public $_quickConfig = NULL;

  /**
   * Allow deveopera to use hook_civicrm_buildForm()
   * to override the registration dupe check
   * CRM-7604
   */
  public $_skipDupeRegistrationCheck = FALSE;

  public $_ppType;
  public $_snippet;

  /**
   * Function to set variables up before form is built
   *
   * @return void
   * @access public
   */
  function preProcess() {
    parent::preProcess();

    CRM_Contribute_Form_Contribution_Main::preProcessPaymentOptions($this);
    if ($this->_snippet) {
      return;
    }

    //CRM-4320.
    //here we can't use parent $this->_allowWaitlist as user might
    //walk back and we maight set this value in this postProcess.
    //(we set when spaces < group count and want to allow become part of waiting )

    $eventFull = CRM_Event_BAO_Participant::eventFull($this->_eventId, FALSE, CRM_Utils_Array::value('has_waitlist', $this->_values['event']));

    $this->_allowWaitlist = FALSE;
    if ($eventFull && !$this->_allowConfirmation &&
      CRM_Utils_Array::value('has_waitlist', $this->_values['event'])
    ) {
      $this->_allowWaitlist = TRUE;
      $this->_waitlistMsg = CRM_Utils_Array::value('waitlist_text', $this->_values['event']);
      if (!$this->_waitlistMsg) {
        $this->_waitlistMsg = ts('This event is currently full. However you can register now and get added to a waiting list. You will be notified if spaces become available.');
      }
    }
    $this->set('allowWaitlist', $this->_allowWaitlist);

    //To check if the user is already registered for the event(CRM-2426)
    if (!$this->_skipDupeRegistrationCheck) {
      self::checkRegistration(NULL, $this);
    }

    $this->assign('availableRegistrations', $this->_availableRegistrations);

    // get the participant values from EventFees.php, CRM-4320
    if ($this->_allowConfirmation) {
      CRM_Event_Form_EventFees::preProcess($this);
    }
  }

  /**
   * This function sets the default values for the form. For edit/view mode
   * the default values are retrieved from the database
   * Adding discussion from CRM-11915 as code comments
   * When multiple payment processors are configured for a event and user does any selection changes for them on online event registeration page :
   * The 'Register' page gets loaded through ajax and following happens :
   * the setDefaults function is called with the variable _ppType set with selected payment processor type,
   * so in the 'if' condition checked whether the selected payment processor's billing mode is of 'billing form mode'. If its not, don't setDefaults for billing form and return instead.
   *- For payment processors of billing mode 'Notify' - return from setDefaults before the code for billing profile population execution .
   * (done this is because for payment processors with 'Notify' mode billing profile form doesn't get rendered on UI)
   *
   * @access public
   *
   * @return None
   */
  function setDefaultValues() {
    if ($this->_ppType && $this->_snippet && !($this->_paymentProcessor['billing_mode'] & CRM_Core_Payment::BILLING_MODE_FORM)) {
      // see function comment block for explanation of this
      return;
    }

    $contactID = parent::getContactID();
    if ($contactID) {
      //@todo CRM-11915 I observed that even when the billing block is not present the routine to retrieve the billing defaults is still called - which seems a bit redundant.
      $names = array(
        'first_name', 'middle_name', 'last_name',
        "street_address-{$this->_bltID}", "city-{$this->_bltID}", "postal_code-{$this->_bltID}",
        "country_id-{$this->_bltID}", "state_province_id-{$this->_bltID}",
      );

      foreach ($names as $name) {
        $fields[$name] = 1;
      }
      $fields["state_province-{$this->_bltID}"] = 1;
      $fields["country-{$this->_bltID}"] = 1;
      $fields["email-{$this->_bltID}"] = 1;
      $fields['email-Primary'] = 1;

      CRM_Core_BAO_UFGroup::setProfileDefaults($contactID, $fields, $this->_defaults);

      // use primary email address if billing email address is empty
      if (empty($this->_defaults["email-{$this->_bltID}"]) &&
        !empty($this->_defaults['email-Primary'])
      ) {
        $this->_defaults["email-{$this->_bltID}"] = $this->_defaults['email-Primary'];
      }

      foreach ($names as $name) {
        if (isset($this->_defaults[$name])) {
          $this->_defaults['billing_' . $name] = $this->_defaults[$name];
        }
      }
    }
    $config = CRM_Core_Config::singleton();
    // set default country from config if no country set
    if (!CRM_Utils_Array::value("billing_country_id-{$this->_bltID}", $this->_defaults)) {
      $this->_defaults["billing_country_id-{$this->_bltID}"] = $config->defaultContactCountry;
    }

    // now fix all state country selectors
    CRM_Core_BAO_Address::fixAllStateSelects($this, $this->_defaults);

    if ($this->_snippet) {
      return $this->_defaults;
    }

    if ($contactID) {
      $options = array();
      $fields = array();

      if (!empty($this->_fields)) {
        $removeCustomFieldTypes = array('Participant');
        foreach ($this->_fields as $name => $dontCare) {
          if (substr($name, 0, 7) == 'custom_') {
            $id = substr($name, 7);
            if (!$this->_allowConfirmation &&
              !CRM_Core_BAO_CustomGroup::checkCustomField($id, $removeCustomFieldTypes)
            ) {
              continue;
            }
            // ignore component fields
          }
          elseif ((substr($name, 0, 12) == 'participant_')) {
            continue;
          }
          $fields[$name] = 1;
        }
      }
    }

    if (!empty($fields)) {
      CRM_Core_BAO_UFGroup::setProfileDefaults($contactID, $fields, $this->_defaults);
    }

    // Set default payment processor as default payment_processor radio button value
    if (!empty($this->_paymentProcessors)) {
      foreach ($this->_paymentProcessors as $pid => $value) {
        if (CRM_Utils_Array::value('is_default', $value)) {
          $this->_defaults['payment_processor'] = $pid;
        }
      }
    }

    //if event is monetary and pay later is enabled and payment
    //processor is not available then freeze the pay later checkbox with
    //default check
    if (CRM_Utils_Array::value('is_pay_later', $this->_values['event']) &&
      !is_array($this->_paymentProcessor)
    ) {
      $this->_defaults['is_pay_later'] = 1;
    }

    //set custom field defaults
    if (!empty($this->_fields)) {
      //load default campaign from page.
      if (array_key_exists('participant_campaign_id', $this->_fields)) {
        $this->_defaults['participant_campaign_id'] = CRM_Utils_Array::value('campaign_id',
          $this->_values['event']
        );
      }

      foreach ($this->_fields as $name => $field) {
        if ($customFieldID = CRM_Core_BAO_CustomField::getKeyID($name)) {
          // fix for CRM-1743
          if (!isset($this->_defaults[$name])) {
            CRM_Core_BAO_CustomField::setProfileDefaults($customFieldID, $name, $this->_defaults,
              NULL, CRM_Profile_Form::MODE_REGISTER
            );
          }
        }
      }
    }

    //fix for CRM-3088, default value for discount set.
    $discountId = NULL;
    if (!empty($this->_values['discount'])) {
      $discountId = CRM_Core_BAO_Discount::findSet($this->_eventId, 'civicrm_event');
      if ($discountId) {
        if (isset($this->_values['event']['default_discount_fee_id'])) {
          $discountKey = CRM_Core_DAO::getFieldValue('CRM_Core_DAO_OptionValue',
            $this->_values['event']['default_discount_fee_id'],
            'weight', 'id'
          );

          $this->_defaults['amount'] = key(array_slice($this->_values['discount'][$discountId],
              $discountKey - 1, $discountKey, TRUE
            ));
        }
      }
    }

    // add this event's default participant role to defaults array
    // (for cases where participant_role field is included in form via profile)
    if ($this->_values['event']['default_role_id']) {
      $this->_defaults['participant_role'] =
      $this->_defaults['participant_role_id'] = $this->_values['event']['default_role_id'];
    }
    if ($this->_priceSetId && !empty($this->_feeBlock)) {
      foreach ($this->_feeBlock as $key => $val) {
        foreach ($val['options'] as $keys => $values) {
          if ($values['is_default'] &&
            !CRM_Utils_Array::value('is_full', $values)
          ) {

            if ($val['html_type'] == 'CheckBox') {
              $this->_defaults["price_{$key}"][$keys] = 1;
            }
            else {
              $this->_defaults["price_{$key}"] = $keys;
            }
          }
        }
      }
    }

    //set default participant fields, CRM-4320.
    $hasAdditionalParticipants = FALSE;
    if ($this->_allowConfirmation) {
      $this->_contactId = $contactID;
      $this->_discountId = $discountId;
      $forcePayLater = CRM_Utils_Array::value('is_pay_later', $this->_defaults, FALSE);
      $this->_defaults = array_merge($this->_defaults, CRM_Event_Form_EventFees::setDefaultValues($this));
      $this->_defaults['is_pay_later'] = $forcePayLater;

      if ($this->_additionalParticipantIds) {
        $hasAdditionalParticipants = TRUE;
        $this->_defaults['additional_participants'] = count($this->_additionalParticipantIds);
      }
    }
    $this->assign('hasAdditionalParticipants', $hasAdditionalParticipants);

    //         //hack to simplify credit card entry for testing
    //         $this->_defaults['credit_card_type']     = 'Visa';
    //         $this->_defaults['credit_card_number']   = '4807731747657838';
    //         $this->_defaults['cvv2']                 = '000';
    //         $this->_defaults['credit_card_exp_date'] = array( 'Y' => '2010', 'M' => '05' );

    // to process Custom data that are appended to URL
    $getDefaults = CRM_Core_BAO_CustomGroup::extractGetParams($this, "'Contact', 'Individual', 'Contribution', 'Participant'");
    if (!empty($getDefaults)) {
      $this->_defaults = array_merge($this->_defaults, $getDefaults);
    }

    return $this->_defaults;
  }

  /**
   * Function to build the form
   *
   * @return None
   * @access public
   */
  public function buildQuickForm() {
    // Build payment processor form
    if ($this->_ppType) {
      CRM_Core_Payment_ProcessorForm::buildQuickForm($this);
      // Return if we are in an ajax callback
      if ($this->_snippet) {
        return;
      }
    }

    $contactID = parent::getContactID();
    $this->assign('contact_id', $contactID);
    $this->assign('display_name', CRM_Contact_BAO_Contact::displayName($contactID));

    $config = CRM_Core_Config::singleton();
    $this->add('hidden', 'scriptFee', NULL);
    $this->add('hidden', 'scriptArray', NULL);

    $bypassPayment = $allowGroupOnWaitlist = $isAdditionalParticipants = FALSE;
    if ($this->_values['event']['is_multiple_registrations']) {
      // don't allow to add additional during confirmation if not preregistered.
      if (!$this->_allowConfirmation || $this->_additionalParticipantIds) {
        // Hardcode maximum number of additional participants here for now. May need to make this configurable per event.
        // Label is value + 1, since the code sees this is ADDITIONAL participants (in addition to "self")
        $additionalOptions = array('' => ts('1'), 1 => ts('2'), 2 => ts('3'), 3 => ts('4'), 4 => ts('5'),
          5 => ts('6'), 6 => ts('7'), 7 => ts('8'), 8 => ts('9'), 9 => ts('10'),
        );
        $element = $this->add('select', 'additional_participants',
          ts('How many people are you registering?'),
          $additionalOptions,
          NULL,
          array('onChange' => "allowParticipant()")
        );
        $isAdditionalParticipants = TRUE;
      }
    }

    //hack to allow group to register w/ waiting
    if ((CRM_Utils_Array::value('is_multiple_registrations', $this->_values['event']) ||
        $this->_priceSetId
      ) &&
      !$this->_allowConfirmation &&
      is_numeric($this->_availableRegistrations)
      && CRM_Utils_Array::value('has_waitlist', $this->_values['event'])
    ) {
      $bypassPayment = TRUE;
      //case might be group become as a part of waitlist.
      //If not waitlist then they require admin approve.
      $allowGroupOnWaitlist = TRUE;
      $this->_waitlistMsg = ts("This event has only %1 space(s) left. If you continue and register more than %1 people (including yourself ), the whole group will be wait listed. Or, you can reduce the number of people you are registering to %1 to avoid being put on the waiting list.", array(1 => $this->_availableRegistrations));

      if ($this->_requireApproval) {
        $this->_requireApprovalMsg = CRM_Utils_Array::value('approval_req_text', $this->_values['event'],
          ts('Registration for this event requires approval. Once your registration(s) have been reviewed, you will receive an email with a link to a web page where you can complete the registration process.')
        );
      }
    }

    //case where only approval needed - no waitlist.
    if ($this->_requireApproval &&
      !$this->_allowWaitlist && !$bypassPayment
    ) {
      $this->_requireApprovalMsg = CRM_Utils_Array::value('approval_req_text', $this->_values['event'],
        ts('Registration for this event requires approval. Once your registration has been reviewed, you will receive an email with a link to a web page where you can complete the registration process.')
      );
    }

    //lets display status to primary page only.
    $this->assign('waitlistMsg', $this->_waitlistMsg);
    $this->assign('requireApprovalMsg', $this->_requireApprovalMsg);
    $this->assign('allowGroupOnWaitlist', $allowGroupOnWaitlist);
    $this->assign('isAdditionalParticipants', $isAdditionalParticipants);

    $this->buildCustom($this->_values['custom_pre_id'], 'customPre');
    $this->buildCustom($this->_values['custom_post_id'], 'customPost');

    //lets get js on two different qf elements.
    $showHidePayfieldName = NULL;
    $showHidePaymentInformation = FALSE;
    if ($this->_values['event']['is_monetary']) {
      self::buildAmount($this);
    }

    $pps = NULL;
    $this->_paymentProcessors = $this->get('paymentProcessors');
    if (!empty($this->_paymentProcessors)) {
      $pps = $this->_paymentProcessors;
      foreach ($pps as $key => & $name) {
        $pps[$key] = $name['name'];
      }
    }

    if (CRM_Utils_Array::value('is_pay_later', $this->_values['event']) &&
      ($this->_allowConfirmation || (!$this->_requireApproval && !$this->_allowWaitlist))
    ) {
      $pps[0] = $this->_values['event']['pay_later_text'];
    }

    if ($this->_values['event']['is_monetary']) {
      if (count($pps) > 1) {
        $this->addRadio('payment_processor', ts('Payment Method'), $pps,
          NULL, "&nbsp;", TRUE
        );
      }
      elseif (!empty($pps)) {
        $ppKeys = array_keys($pps);
        $currentPP = array_pop($ppKeys);
        $this->addElement('hidden', 'payment_processor', $currentPP);
      }
    }

    //lets add some qf element to bypass payment validations, CRM-4320
    if ($bypassPayment) {
      $this->addElement('hidden', 'bypass_payment', NULL, array('id' => 'bypass_payment'));
    }
    $this->assign('bypassPayment', $bypassPayment);
    $this->assign('showHidePaymentInformation', $showHidePaymentInformation);

    $userID = parent::getContactID();

    if (!$userID) {
      $createCMSUser = FALSE;

      if ($this->_values['custom_pre_id']) {
        $profileID = $this->_values['custom_pre_id'];
        $createCMSUser = CRM_Core_DAO::getFieldValue('CRM_Core_DAO_UFGroup', $profileID, 'is_cms_user');
      }

      if (!$createCMSUser &&
        $this->_values['custom_post_id']
      ) {
        if (!is_array($this->_values['custom_post_id'])) {
          $profileIDs = array($this->_values['custom_post_id']);
        }
        else {
          $profileIDs = $this->_values['custom_post_id'];
        }
        foreach ($profileIDs as $pid) {
          if (CRM_Core_DAO::getFieldValue('CRM_Core_DAO_UFGroup', $pid, 'is_cms_user')) {
            $profileID = $pid;
            $createCMSUser = TRUE;
            break;
          }
        }
      }

      if ($createCMSUser) {
        CRM_Core_BAO_CMSUser::buildForm($this, $profileID, TRUE);
      }
    }

    //we have to load confirm contribution button in template
    //when multiple payment processor as the user
    //can toggle with payment processor selection
    $billingModePaymentProcessors = 0;
    if (!CRM_Utils_System::isNull($this->_paymentProcessors)) {
      foreach ($this->_paymentProcessors as $key => $values) {
        if ($values['billing_mode'] == CRM_Core_Payment::BILLING_MODE_BUTTON) {
          $billingModePaymentProcessors++;
        }
      }
    }

    if ($billingModePaymentProcessors && count($this->_paymentProcessors) == $billingModePaymentProcessors) {
      $allAreBillingModeProcessors = TRUE;
    } else {
      $allAreBillingModeProcessors = FALSE;
    }

    if (!$allAreBillingModeProcessors ||
      CRM_Utils_Array::value('is_pay_later', $this->_values['event']) || $bypassPayment
    ) {

      //freeze button to avoid multiple calls.
      $js = NULL;

      if (!CRM_Utils_Array::value('is_monetary', $this->_values['event'])) {
        $js = array('onclick' => "return submitOnce(this,'" . $this->_name . "','" . ts('Processing') . "');");
      }
      $this->addButtons(array(
          array(
            'type' => 'upload',
            'name' => ts('Continue >>'),
            'spacing' => '&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;',
            'isDefault' => TRUE,
            'js' => $js,
          ),
        )
      );
    }

    $this->addFormRule(array('CRM_Event_Form_Registration_Register', 'formRule'), $this);

    // add pcp fields
    if ($this->_pcpId) {
      CRM_PCP_BAO_PCP::buildPcp($this->_pcpId, $this);
    }
  }

  /**
   * build the radio/text form elements for the amount field
   *
   * @param object   $form form object
   * @param boolean  $required  true if you want to add formRule
   * @param int      $discountId discount id for the event
   *
   * @return void
   * @access public
   * @static
   */
  static public function buildAmount(&$form, $required = TRUE, $discountId = NULL) {
    //if payment done, no need to build the fee block.
    if (!empty($form->_paymentId)) {
      //fix to diaplay line item in update mode.
      $form->assign('priceSet', isset($form->_priceSet) ? $form->_priceSet : NULL);
      return;
    }

    $feeFields = CRM_Utils_Array::value('fee', $form->_values);

    if (is_array($feeFields)) {
      $form->_feeBlock = &$form->_values['fee'];
    }

    //check for discount.
    $discountedFee = CRM_Utils_Array::value('discount', $form->_values);
    if (is_array($discountedFee) && !empty($discountedFee)) {
      if (!$discountId) {
        $form->_discountId = $discountId = CRM_Core_BAO_Discount::findSet($form->_eventId, 'civicrm_event');
      }
      if ($discountId) {
        $form->_feeBlock = &$form->_values['discount'][$discountId];
      }
    }
    if (!is_array($form->_feeBlock)) {
      $form->_feeBlock = array();
    }

    //its time to call the hook.
    CRM_Utils_Hook::buildAmount('event', $form, $form->_feeBlock);

    //reset required if participant is skipped.
    $button = substr($form->controller->getButtonName(), -4);
    if ($required && $button == 'skip') {
      $required = FALSE;
    }

    $className = CRM_Utils_System::getClassName($form);

    //build the priceset fields.
    if (isset($form->_priceSetId) && $form->_priceSetId) {

      //format price set fields across option full.
      self::formatFieldsForOptionFull($form);

      if (CRM_Utils_Array::value('is_quick_config', $form->_priceSet)) {
        $form->_quickConfig = $form->_priceSet['is_quick_config'];
      }
      $form->add('hidden', 'priceSetId', $form->_priceSetId);

      foreach ($form->_feeBlock as $field) {
        if (CRM_Utils_Array::value('visibility', $field) == 'public' ||
          $className == 'CRM_Event_Form_Participant'
        ) {
          $fieldId = $field['id'];
          $elementName = 'price_' . $fieldId;

          $isRequire = CRM_Utils_Array::value('is_required', $field);
          if ($button == 'skip') {
            $isRequire = FALSE;
          }

          //user might modified w/ hook.
          $options = CRM_Utils_Array::value('options', $field);
          if (!is_array($options)) {
            continue;
          }

          $optionFullIds = CRM_Utils_Array::value('option_full_ids', $field, array());

          //soft suppress required rule when option is full.
          if (!empty($optionFullIds) && (count($options) == count($optionFullIds))) {
            $isRequire = FALSE;
          }

          //build the element.
          CRM_Price_BAO_Field::addQuickFormElement($form,
            $elementName,
            $fieldId,
            FALSE,
            $isRequire,
            NULL,
            $options,
            $optionFullIds
          );
        }
      }
      $form->assign('priceSet', $form->_priceSet);
    }
    else {
      $eventFeeBlockValues = array();
      foreach ($form->_feeBlock as $fee) {
        if (is_array($fee)) {

          //CRM-7632, CRM-6201
          $totalAmountJs = NULL;
          if ($className == 'CRM_Event_Form_Participant') {
            $totalAmountJs = array('onClick' => "fillTotalAmount(" . $fee['value'] . ")");
          }

          $eventFeeBlockValues['amount_id_' . $fee['amount_id']] = $fee['value'];
          $elements[] = &$form->createElement('radio', NULL, '',
            CRM_Utils_Money::format($fee['value']) . ' ' .
            $fee['label'],
            $fee['amount_id'],
            $totalAmountJs
          );
        }
      }
      $form->assign('eventFeeBlockValues', json_encode($eventFeeBlockValues));

      $form->_defaults['amount'] = CRM_Utils_Array::value('default_fee_id', $form->_values['event']);
      $element = &$form->addGroup($elements, 'amount', ts('Event Fee(s)'), '<br />');
      if (isset($form->_online) && $form->_online) {
        $element->freeze();
      }
      if ($required) {
        $form->addRule('amount', ts('Fee Level is a required field.'), 'required');
      }
    }
  }

  public static function formatFieldsForOptionFull(&$form) {
    $priceSet = $form->get('priceSet');
    $priceSetId = $form->get('priceSetId');
    if (!$priceSetId ||
      !is_array($priceSet) ||
      empty($priceSet) ||
      !CRM_Utils_Array::value('optionsMaxValueTotal', $priceSet)
    ) {
      return;
    }

    $skipParticipants = $formattedPriceSetDefaults = array();
    if ($form->_allowConfirmation && (isset($form->_pId) || isset($form->_additionalParticipantId))) {
      $participantId = isset($form->_pId) ? $form->_pId : $form->_additionalParticipantId;
      $pricesetDefaults = CRM_Event_Form_EventFees::setDefaultPriceSet($participantId,
        $form->_eventId
      );
      // modify options full to respect the selected fields
      // options on confirmation.
      $formattedPriceSetDefaults = self::formatPriceSetParams($form, $pricesetDefaultOptions);

      // to skip current registered participants fields option count on confirmation.
      $skipParticipants[] = $form->_participantId;
      if (!empty($form->_additionalParticipantIds)) {
        $skipParticipants = array_merge($skipParticipants, $form->_additionalParticipantIds);
      }
    }

    $className = CRM_Utils_System::getClassName($form);

    //get the current price event price set options count.
    $currentOptionsCount = self::getPriceSetOptionCount($form);
    $recordedOptionsCount = CRM_Event_BAO_Participant::priceSetOptionsCount($form->_eventId, $skipParticipants);

    foreach ($form->_feeBlock as & $field) {
      $optionFullIds = array();
      $fieldId = $field['id'];
      if (!is_array($field['options'])) {
        continue;
      }
      foreach ($field['options'] as & $option) {
        $optId             = $option['id'];
        $count             = CRM_Utils_Array::value('count', $option, 0);
        $maxValue          = CRM_Utils_Array::value('max_value', $option, 0);
        $dbTotalCount      = CRM_Utils_Array::value($optId, $recordedOptionsCount, 0);
        $currentTotalCount = CRM_Utils_Array::value($optId, $currentOptionsCount, 0);

        // Do not consider current count for select field,
        // since we are not going to freeze the options.
        if ($field['html_type'] == 'Select') {
          $totalCount = $dbTotalCount;
        }
        else {
          $totalCount = $currentTotalCount + $dbTotalCount;
        }

        $isFull = FALSE;
        if ($maxValue &&
          (($totalCount >= $maxValue) || ($totalCount + $count > $maxValue))
        ) {
          $isFull = TRUE;
          $optionFullIds[$optId] = $optId;
        }

        //here option is not full,
        //but we don't want to allow participant to increase
        //seats at the time of re-walking registration.
        if ($count &&
          $form->_allowConfirmation &&
          !empty($formattedPriceSetDefaults)
        ) {
          if (!CRM_Utils_Array::value("price_{$field}", $formattedPriceSetDefaults) ||
            !CRM_Utils_Array::value($opId, $formattedPriceSetDefaults["price_{$fieldId}"])
          ) {
            $optionFullIds[$optId] = $optId;
            $isFull = TRUE;
          }
        }
        $option['is_full'] = $isFull;
        $option['db_total_count'] = $dbTotalCount;
        $option['total_option_count'] = $dbTotalCount + $currentTotalCount;
      }

      //ignore option full for offline registration.
      if ($className == 'CRM_Event_Form_Participant') {
        $optionFullIds = array();
      }

      //finally get option ids in.
      $field['option_full_ids'] = $optionFullIds;
    }
  }

  /**
   * global form rule
   *
   * @param array $fields  the input form values
   * @param array $files   the uploaded files if any
   * @param array $options additional user data
   *
   * @return true if no errors, else array of errors
   * @access public
   * @static
   */
  static function formRule($fields, $files, $self) {
    $errors = array();
    //check that either an email or firstname+lastname is included in the form(CRM-9587)
    self::checkProfileComplete($fields, $errors, $self->_eventId);
    //To check if the user is already registered for the event(CRM-2426)
    if (!$self->_skipDupeRegistrationCheck) {
      self::checkRegistration($fields, $self);
    }
    //check for availability of registrations.
    if (!$self->_allowConfirmation &&
      !CRM_Utils_Array::value('bypass_payment', $fields) &&
      is_numeric($self->_availableRegistrations) &&
      CRM_Utils_Array::value('additional_participants', $fields) >= $self->_availableRegistrations
    ) {
      $errors['additional_participants'] = ts("There is only enough space left on this event for %1 participant(s).", array(1 => $self->_availableRegistrations));
    }

    // during confirmation don't allow to increase additional participants, CRM-4320
    if ($self->_allowConfirmation &&
      CRM_Utils_Array::value('additional_participants', $fields) &&
      is_array($self->_additionalParticipantIds) &&
      $fields['additional_participants'] > count($self->_additionalParticipantIds)
    ) {
      $errors['additional_participants'] = ts("Oops. It looks like you are trying to increase the number of additional people you are registering for. You can confirm registration for a maximum of %1 additional people.", array(1 => count($self->_additionalParticipantIds)));
    }

    //don't allow to register w/ waiting if enough spaces available.
    if (CRM_Utils_Array::value('bypass_payment', $fields)) {
      if (!is_numeric($self->_availableRegistrations) ||
        (!CRM_Utils_Array::value('priceSetId', $fields) && CRM_Utils_Array::value('additional_participants', $fields) < $self->_availableRegistrations)
      ) {
        $errors['bypass_payment'] = ts("Oops. There are enough available spaces in this event. You can not add yourself to the waiting list.");
      }
    }

    if (CRM_Utils_Array::value('additional_participants', $fields) &&
      !CRM_Utils_Rule::positiveInteger($fields['additional_participants'])
    ) {
      $errors['additional_participants'] = ts('Please enter a whole number for Number of additional people.');
    }

    // priceset validations
    if (CRM_Utils_Array::value('priceSetId', $fields)) {
      //format params.
      $formatted = self::formatPriceSetParams($self, $fields);
      $ppParams = array($formatted);
      $priceSetErrors = self::validatePriceSet($self, $ppParams);
      $primaryParticipantCount = self::getParticipantCount($self, $ppParams);

      //get price set fields errors in.
      $errors = array_merge($errors, CRM_Utils_Array::value(0, $priceSetErrors, array()));

      $totalParticipants = $primaryParticipantCount;
      if (CRM_Utils_Array::value('additional_participants', $fields)) {
        $totalParticipants += $fields['additional_participants'];
      }

      if (!CRM_Utils_Array::value('bypass_payment', $fields) &&
        !$self->_allowConfirmation &&
        is_numeric($self->_availableRegistrations) &&
        $self->_availableRegistrations < $totalParticipants
      ) {
        $errors['_qf_default'] = ts("Only %1 Registrations available.", array(1 => $self->_availableRegistrations));
      }

      $lineItem = array();
      CRM_Price_BAO_Set::processAmount($self->_values['fee'], $fields, $lineItem);
      if ($fields['amount'] < 0) {
        $errors['_qf_default'] = ts('Event Fee(s) can not be less than zero. Please select the options accordingly');
      }
    }

    if ($self->_values['event']['is_monetary']) {
      if (is_array($self->_paymentProcessor)) {
        $payment = CRM_Core_Payment::singleton($self->_mode, $self->_paymentProcessor, $this);
        $error = $payment->checkConfig($self->_mode);
        if ($error) {
          $errors['_qf_default'] = $error;
        }
      }
      // return if this is express mode
      $config = CRM_Core_Config::singleton();
      if ($self->_paymentProcessor['billing_mode'] & CRM_Core_Payment::BILLING_MODE_BUTTON) {
        if (CRM_Utils_Array::value($self->_expressButtonName . '_x', $fields) ||
          CRM_Utils_Array::value($self->_expressButtonName . '_y', $fields) ||
          CRM_Utils_Array::value($self->_expressButtonName, $fields)
        ) {
          return empty($errors) ? TRUE : $errors;
        }
      }

      $isZeroAmount = $skipPayementValidation = FALSE;
      if (CRM_Utils_Array::value('priceSetId', $fields)) {
        if (CRM_Utils_Array::value('amount', $fields) == 0) {
          $isZeroAmount = TRUE;
        }
      }
      elseif (CRM_Utils_Array::value('amount', $fields) &&
        (isset($self->_values['discount'][$fields['amount']])
          && CRM_Utils_Array::value('value', $self->_values['discount'][$fields['amount']]) == 0
        )
      ) {
        $isZeroAmount = TRUE;
      }
      elseif (CRM_Utils_Array::value('amount', $fields) &&
        (isset($self->_values['fee'][$fields['amount']])
          && CRM_Utils_Array::value('value', $self->_values['fee'][$fields['amount']]) == 0
        )
      ) {
        $isZeroAmount = TRUE;
      }

      if ($isZeroAmount && !($self->_forcePayement && CRM_Utils_Array::value('additional_participants', $fields))) {
        $skipPayementValidation = TRUE;
      }

      // also return if paylater mode or zero fees for valid members
      if (CRM_Utils_Array::value('is_pay_later', $fields) ||
        CRM_Utils_Array::value('bypass_payment', $fields) ||
        $skipPayementValidation ||
        (!$self->_allowConfirmation && ($self->_requireApproval || $self->_allowWaitlist))
      ) {
        return empty($errors) ? TRUE : $errors;
      }
      if (property_exists($self, '_paymentFields') && !empty($self->_paymentFields )) {
        foreach ($self->_paymentFields as $name => $fld) {
          if ($fld['is_required'] &&
            CRM_Utils_System::isNull(CRM_Utils_Array::value($name, $fields))
          ) {
            $errors[$name] = ts('%1 is a required field.', array(1 => $fld['title']));
          }
        }
      }
    }
    // make sure that credit card number and cvv are valid
    if (CRM_Utils_Array::value('credit_card_type', $fields)) {
      if (CRM_Utils_Array::value('credit_card_number', $fields) &&
        !CRM_Utils_Rule::creditCardNumber($fields['credit_card_number'], $fields['credit_card_type'])
      ) {
        $errors['credit_card_number'] = ts('Please enter a valid Credit Card Number');
      }

      if (CRM_Utils_Array::value('cvv2', $fields) &&
        !CRM_Utils_Rule::cvv($fields['cvv2'], $fields['credit_card_type'])
      ) {
        $errors['cvv2'] = ts('Please enter a valid Credit Card Verification Number');
      }
    }
    foreach (CRM_Contact_BAO_Contact::$_greetingTypes as $greeting) {
      if ($greetingType = CRM_Utils_Array::value($greeting, $fields)) {
        $customizedValue = CRM_Core_OptionGroup::getValue($greeting, 'Customized', 'name');
        if ($customizedValue == $greetingType && empty($fields[$greeting . '_custom'])) {
          $errors[$customizedGreeting] = ts('Custom %1 is a required field if %1 is of type Customized.',
            array(1 => ucwords(str_replace('_', ' ', $greeting)))
          );
        }
      }
    }
    return empty($errors) ? TRUE : $errors;
  }

  /**
   * Check if profiles are complete when event registration occurs(CRM-9587)
   *
   */
  static function checkProfileComplete($fields, &$errors, $eventId) {
    $email = '';
    foreach ($fields as $fieldname => $fieldvalue) {
      if (substr($fieldname, 0, 6) == 'email-' && $fieldvalue) {
        $email = $fieldvalue;
      }
    }

    if (!$email && !(CRM_Utils_Array::value('first_name', $fields) &&
        CRM_Utils_Array::value('last_name', $fields)
      )) {
      $defaults = $params = array('id' => $eventId);
      CRM_Event_BAO_Event::retrieve($params, $defaults);
      $message = ts("Mandatory fields (first name and last name, OR email address) are missing from this form.");
      $errors['_qf_default'] = $message;
    }
  }

  /**
   * Function to process the form
   *
   * @access public
   *
   * @return None
   */
  public function postProcess() {
    // get the submitted form values.
    $params = $this->controller->exportValues($this->_name);

    //set as Primary participant
    $params['is_primary'] = 1;

    if ($this->_values['event']['is_pay_later'] && !array_key_exists('hidden_processor', $params)) {
      $params['is_pay_later'] = 1;
    }
    else {
      $params['is_pay_later'] = 0;
    }

    $this->set('is_pay_later', $params['is_pay_later']);

    // assign pay later stuff
    $this->_params['is_pay_later'] = CRM_Utils_Array::value('is_pay_later', $params, FALSE);
    $this->assign('is_pay_later', $params['is_pay_later']);
    if ($params['is_pay_later']) {
      $this->assign('pay_later_text', $this->_values['event']['pay_later_text']);
      $this->assign('pay_later_receipt', $this->_values['event']['pay_later_receipt']);
    }

    if (!$this->_allowConfirmation) {
      // check if the participant is already registered
      if (!$this->_skipDupeRegistrationCheck) {
        $params['contact_id'] = self::checkRegistration($params, $this, FALSE, TRUE, TRUE);
      }
    }

    if (CRM_Utils_Array::value('image_URL', $params)) {
      CRM_Contact_BAO_Contact::processImageParams($params);
    }

    //carry campaign to partcipants.
    if (array_key_exists('participant_campaign_id', $params)) {
      $params['campaign_id'] = $params['participant_campaign_id'];
    }
    else {
      $params['campaign_id'] = CRM_Utils_Array::value('campaign_id', $this->_values['event']);
    }

    //hack to allow group to register w/ waiting
    $primaryParticipantCount = self::getParticipantCount($this, $params);

    $totalParticipants = $primaryParticipantCount;
    if (CRM_Utils_Array::value('additional_participants', $params)) {
      $totalParticipants += $params['additional_participants'];
    }
    if (!$this->_allowConfirmation &&
      CRM_Utils_Array::value('bypass_payment', $params) &&
      is_numeric($this->_availableRegistrations) &&
      $totalParticipants > $this->_availableRegistrations
    ) {
      $this->_allowWaitlist = TRUE;
      $this->set('allowWaitlist', TRUE);
    }

    //carry participant id if pre-registered.
    if ($this->_allowConfirmation && $this->_participantId) {
      $params['participant_id'] = $this->_participantId;
    }

    $params['defaultRole'] = 1;
    if (array_key_exists('participant_role', $params)) {
      $params['participant_role_id'] = $params['participant_role'];
    }

    if (array_key_exists('participant_role_id', $params)) {
      $params['defaultRole'] = 0;
    }
    if (!CRM_Utils_Array::value('participant_role_id', $params) &&
      $this->_values['event']['default_role_id']
    ) {
      $params['participant_role_id'] = $this->_values['event']['default_role_id'];
    }

    $config = CRM_Core_Config::singleton();
    $params['currencyID'] = $config->defaultCurrency;

    if ($this->_values['event']['is_monetary']) {
      // we first reset the confirm page so it accepts new values
      $this->controller->resetPage('Confirm');

      //added for discount
      $discountId = CRM_Core_BAO_Discount::findSet($this->_eventId, 'civicrm_event');

      if (!empty($this->_values['discount'][$discountId])) {
        $params['discount_id'] = $discountId;
        $params['amount_level'] = $this->_values['discount'][$discountId][$params['amount']]['label'];

        $params['amount'] = $this->_values['discount'][$discountId][$params['amount']]['value'];
      }
      elseif (empty($params['priceSetId'])) {
        $params['amount_level'] = $this->_values['fee'][$params['amount']]['label'];
        $params['amount'] = $this->_values['fee'][$params['amount']]['value'];
      }
      else {
        $lineItem = array();
        CRM_Price_BAO_Set::processAmount($this->_values['fee'], $params, $lineItem);
        $this->set('lineItem', array($lineItem));
        $this->set('lineItemParticipantsCount', array($primaryParticipantCount));
      }

      $this->set('amount', $params['amount']);
      $this->set('amount_level', $params['amount_level']);

      // generate and set an invoiceID for this transaction
      $invoiceID = md5(uniqid(rand(), TRUE));
      $this->set('invoiceID', $invoiceID);

      if (is_array($this->_paymentProcessor)) {
        $payment = CRM_Core_Payment::singleton($this->_mode, $this->_paymentProcessor, $this);
      }
      // default mode is direct
      $this->set('contributeMode', 'direct');

      if (isset($params["state_province_id-{$this->_bltID}"]) &&
        $params["state_province_id-{$this->_bltID}"]
      ) {
        $params["state_province-{$this->_bltID}"] = CRM_Core_PseudoConstant::stateProvinceAbbreviation($params["state_province_id-{$this->_bltID}"]);
      }

      if (isset($params["country_id-{$this->_bltID}"]) &&
        $params["country_id-{$this->_bltID}"]
      ) {
        $params["country-{$this->_bltID}"] = CRM_Core_PseudoConstant::countryIsoCode($params["country_id-{$this->_bltID}"]);
      }
      if (isset($params['credit_card_exp_date'])) {
        $params['year'] = CRM_Core_Payment_Form::getCreditCardExpirationYear($params);
        $params['month'] = CRM_Core_Payment_Form::getCreditCardExpirationMonth($params);
      }
      if ($this->_values['event']['is_monetary']) {
        $params['ip_address'] = CRM_Utils_System::ipAddress();
        $params['currencyID'] = $config->defaultCurrency;
        $params['payment_action'] = 'Sale';
        $params['invoiceID'] = $invoiceID;
      }

      $this->_params = array();
      $this->_params[] = $params;
      $this->set('params', $this->_params);

      if ($this->_paymentProcessor['billing_mode'] & CRM_Core_Payment::BILLING_MODE_BUTTON) {
        //get the button name
        $buttonName = $this->controller->getButtonName();
        if (in_array($buttonName,
            array(
              $this->_expressButtonName,
              $this->_expressButtonName . '_x',
              $this->_expressButtonName . '_y',
            )
          ) &&
            !CRM_Utils_Array::value('is_pay_later', $params) &&
          !$this->_allowWaitlist &&
          !$this->_requireApproval
        ) {
          $this->set('contributeMode', 'express');

          // Send Event Name & Id in Params
          $params['eventName'] = $this->_values['event']['title'];
          $params['eventId'] = $this->_values['event']['id'];

          $params['cancelURL'] = CRM_Utils_System::url('civicrm/event/register',
            "_qf_Register_display=1&qfKey={$this->controller->_key}",
            TRUE, NULL, FALSE
          );
          if (CRM_Utils_Array::value('additional_participants', $params, FALSE)) {
            $urlArgs = "_qf_Participant_1_display=1&rfp=1&qfKey={$this->controller->_key}";
          }
          else {
            $urlArgs = "_qf_Confirm_display=1&rfp=1&qfKey={$this->controller->_key}";
          }
          $params['returnURL'] = CRM_Utils_System::url('civicrm/event/register',
            $urlArgs,
            TRUE, NULL, FALSE
          );
          $params['invoiceID'] = $invoiceID;

          //default action is Sale
          $params['payment_action'] = 'Sale';

          $token = $payment->setExpressCheckout($params);
          if (is_a($token, 'CRM_Core_Error')) {
            CRM_Core_Error::displaySessionError($token);
            CRM_Utils_System::redirect($params['cancelURL']);
          }

          $this->set('token', $token);

          $paymentURL = $this->_paymentProcessor['url_site'] . "/cgi-bin/webscr?cmd=_express-checkout&token=$token";

          CRM_Utils_System::redirect($paymentURL);
        }
      }
      elseif ($this->_paymentProcessor['billing_mode'] & CRM_Core_Payment::BILLING_MODE_NOTIFY) {
        $this->set('contributeMode', 'notify');
      }
    }
    else {
      $session = CRM_Core_Session::singleton();
      $params['description'] = ts('Online Event Registration') . ' ' . $this->_values['event']['title'];

      $this->_params = array();
      $this->_params[] = $params;
      $this->set('params', $this->_params);

      if (!CRM_Utils_Array::value('additional_participants', $params)) {
        self::processRegistration($this->_params);
      }
    }

    // If registering > 1 participant, give status message
    if (CRM_Utils_Array::value('additional_participants', $params, FALSE)) {
      $statusMsg = ts('Registration information for participant 1 has been saved.');
      CRM_Core_Session::setStatus($statusMsg, ts('Saved'), 'success');
    }
  }
  //end of function

  /*
   * Function to process Registration of free event
   *
   * @param  array $param Form valuess
   * @param  int contactID
   *
   * @return None
   * access public
   *
   */
  public function processRegistration($params, $contactID = NULL) {
    $session = CRM_Core_Session::singleton();
    $this->_participantInfo = array();

    // CRM-4320, lets build array of cancelled additional participant ids
    // those are drop or skip by primary at the time of confirmation.
    // get all in and then unset those are confirmed.
    $cancelledIds = $this->_additionalParticipantIds;

    $participantCount = array();
    foreach ($params as $participantNum => $record) {
      if ($record == 'skip') {
        $participantCount[$participantNum] = 'skip';
      }
      elseif ($participantNum) {
        $participantCount[$participantNum] = 'participant';
      }
    }

    $registerByID = NULL;
    foreach ($params as $key => $value) {
      if ($value != 'skip') {
        $fields = NULL;

        // setting register by Id and unset contactId.
        if (!CRM_Utils_Array::value('is_primary', $value)) {
          $contactID = NULL;
          $registerByID = $this->get('registerByID');
          if ($registerByID) {
            $value['registered_by_id'] = $registerByID;
          }
          // get an email if one exists for the participant
          $participantEmail = '';
          foreach (array_keys($value) as $valueName) {
            if (substr($valueName, 0, 6) == 'email-') {
              $participantEmail = $value[$valueName];
            }
          }
          if ($participantEmail) {
            $this->_participantInfo[] = $participantEmail;
          }
          else {
            $this->_participantInfo[] = $value['first_name'] . ' ' . $value['last_name'];
          }
        }
        elseif (CRM_Utils_Array::value('contact_id', $value)) {
          $contactID = $value['contact_id'];
        }
        else {
          $contactID = parent::getContactID();
        }

        CRM_Event_Form_Registration_Confirm::fixLocationFields($value, $fields);
        //for free event or additional participant, dont create billing email address.
        if (!CRM_Utils_Array::value('is_primary', $value) || !$this->_values['event']['is_monetary']) {
          unset($value["email-{$this->_bltID}"]);
        }

        $contactID = CRM_Event_Form_Registration_Confirm::updateContactFields($contactID, $value, $fields);

        // lets store the contactID in the session
        // we dont store in userID in case the user is doing multiple
        // transactions etc
        // for things like tell a friend
        if (!parent::getContactID() && CRM_Utils_Array::value('is_primary', $value)) {
          $session->set('transaction.userID', $contactID);
        }

        //lets get the status if require approval or waiting.

        $waitingStatuses = CRM_Event_PseudoConstant::participantStatus(NULL, "class = 'Waiting'");
        if ($this->_allowWaitlist && !$this->_allowConfirmation) {
          $value['participant_status_id'] = $value['participant_status'] = array_search('On waitlist', $waitingStatuses);
        }
        elseif ($this->_requireApproval && !$this->_allowConfirmation) {
          $value['participant_status_id'] = $value['participant_status'] = array_search('Awaiting approval', $waitingStatuses);
        }

        $this->set('value', $value);
        $this->confirmPostProcess($contactID, NULL, NULL);

        //lets get additional participant id to cancel.
        if ($this->_allowConfirmation && is_array($cancelledIds)) {
          $additonalId = CRM_Utils_Array::value('participant_id', $value);
          if ($additonalId && $key = array_search($additonalId, $cancelledIds)) {
            unset($cancelledIds[$key]);
          }
        }
      }
    }

    // update status and send mail to cancelled additonal participants, CRM-4320
    if ($this->_allowConfirmation && is_array($cancelledIds) && !empty($cancelledIds)) {
      $cancelledId = array_search('Cancelled',
        CRM_Event_PseudoConstant::participantStatus(NULL, "class = 'Negative'")
      );
      CRM_Event_BAO_Participant::transitionParticipants($cancelledIds, $cancelledId);
    }

    //set information about additional participants if exists
    if (count($this->_participantInfo)) {
      $this->set('participantInfo', $this->_participantInfo);
    }

    //send mail Confirmation/Receipt
    if ($this->_contributeMode != 'checkout' ||
      $this->_contributeMode != 'notify'
    ) {
      $isTest = FALSE;
      if ($this->_action & CRM_Core_Action::PREVIEW) {
        $isTest = TRUE;
      }

      //handle if no additional participant.
      if (!$registerByID) {
        $registerByID = $this->get('registerByID');
      }
      $primaryContactId = $this->get('primaryContactId');

      //build an array of custom profile and assigning it to template.
      $additionalIDs = CRM_Event_BAO_Event::buildCustomProfile($registerByID, NULL,
        $primaryContactId, $isTest, TRUE
      );

      //lets carry all paticipant params w/ values.
      foreach ($additionalIDs as $participantID => $contactId) {
        $participantNum = NULL;
        if ($participantID == $registerByID) {
          $participantNum = 0;
        }
        else {
          if ($participantNum = array_search('participant', $participantCount)) {
            unset($participantCount[$participantNum]);
          }
        }

        if ($participantNum === NULL) {
          break;
        }

        //carry the participant submitted values.
        $this->_values['params'][$participantID] = $params[$participantNum];
      }

      //lets send  mails to all with meanigful text, CRM-4320.
      $this->assign('isOnWaitlist', $this->_allowWaitlist);
      $this->assign('isRequireApproval', $this->_requireApproval);

      foreach ($additionalIDs as $participantID => $contactId) {
        if ($participantID == $registerByID) {
          //set as Primary Participant
          $this->assign('isPrimary', 1);

          $customProfile = CRM_Event_BAO_Event::buildCustomProfile($participantID, $this->_values, NULL, $isTest);

          if (count($customProfile)) {
            $this->assign('customProfile', $customProfile);
            $this->set('customProfile', $customProfile);
          }
        }
        else {
          $this->assign('isPrimary', 0);
          $this->assign('customProfile', NULL);
        }

        //send Confirmation mail to Primary & additional Participants if exists
        CRM_Event_BAO_Event::sendMail($contactId, $this->_values, $participantID, $isTest);
      }
    }
  }

  /**
   * Method to check if the user is already registered for the event
   * and if result found redirect to the event info page
   *
   * @param array $fields  the input form values(anonymous user)
   * @param array $self    event data
   * @param boolean $isAdditional treat isAdditional participants a bit differently
   * @param boolean $returnContactId just find and return the contactID match to use
   * @param boolean $useDedupeRules force usage of dedupe rules
   *
   * @return void
   * @access public
   */
  static function checkRegistration($fields, &$self, $isAdditional = FALSE, $returnContactId = FALSE, $useDedupeRules = FALSE) {
    // CRM-3907, skip check for preview registrations
    // CRM-4320 participant need to walk wizard
    if (!$returnContactId &&
      ($self->_mode == 'test' || $self->_allowConfirmation)
    ) {
      return FALSE;
    }

    $contactID = NULL;
    $session = CRM_Core_Session::singleton();
    if (!$isAdditional) {
      $contactID = parent::getContactID();
    }

    if (!$contactID && is_array($fields) && $fields) {

      //CRM-6996
      //as we are allowing w/ same email address,
      //lets check w/ other contact params.
      if ($self->_values['event']['allow_same_participant_emails']) {
        $params = $fields;
        $level = ($isAdditional) ? 'Supervised' : 'Unsupervised';

        $dedupeParams = CRM_Dedupe_Finder::formatParams($params, 'Individual');

        // disable permission based on cache since event registration is public page/feature.
        $dedupeParams['check_permission'] = FALSE;
        $ids = CRM_Dedupe_Finder::dupesByParams($dedupeParams, 'Individual', $level);
        $contactID = CRM_Utils_Array::value(0, $ids);
      }
      else {
        foreach ($fields as $fieldname => $fieldvalue) {
          if (substr($fieldname, 0, 6) == 'email-') {
            $emailString = trim($fieldvalue);
            if (!empty($emailString)) {
              $match = CRM_Contact_BAO_Contact::matchContactOnEmail($emailString, 'Individual');
              if (!empty($match)) {
                $contactID = $match->contact_id;
              }
            }
          }
        }
      }
    }

    if ($returnContactId) {
      // CRM-7377
      // return contactID if contact already exists
      return $contactID;
    }

    if ($contactID) {
      $participant = new CRM_Event_BAO_Participant();
      $participant->contact_id = $contactID;
      $participant->event_id = $self->_values['event']['id'];
      if (!empty($fields['participant_role']) && is_numeric($fields['participant_role'])) {
        $participant->role_id = $fields['participant_role'];
      }
      else {
        $participant->role_id = $self->_values['event']['default_role_id'];
      }
      $participant->is_test = 0;
      $participant->find();
      $statusTypes = CRM_Event_PseudoConstant::participantStatus(NULL, 'is_counted = 1');
      while ($participant->fetch()) {
        if (array_key_exists($participant->status_id, $statusTypes)) {
          if (!$isAdditional && !$self->_values['event']['allow_same_participant_emails']) {
            $registerUrl = CRM_Utils_System::url('civicrm/event/register',
              "reset=1&id={$self->_values['event']['id']}&cid=0"
            );
            if ($self->_pcpId) {
              $registerUrl .= '&pcpId=' . $self->_pcpId;
            }

            $status = ts("It looks like you are already registered for this event. If you want to change your registration, or you feel that you've gotten this message in error, please contact the site administrator.") . ' ' . ts('You can also <a href="%1">register another participant</a>.', array(1 => $registerUrl));
            $session->setStatus($status, ts('Oops.'), 'alert');
            $url = CRM_Utils_System::url('civicrm/event/info',
              "reset=1&id={$self->_values['event']['id']}&noFullMsg=true"
            );
            if ($self->_action & CRM_Core_Action::PREVIEW) {
              $url .= '&action=preview';
            }

            if ($self->_pcpId) {
              $url .= '&pcpId=' . $self->_pcpId;
            }

            CRM_Utils_System::redirect($url);
          }

          if ($isAdditional) {
            $status = ts("It looks like this participant is already registered for this event. If you want to change your registration, or you feel that you've gotten this message in error, please contact the site administrator.");
            $session->setStatus($status, ts('Oops.'), 'alert');
            return $participant->id;
          }
        }
      }
    }
  }
}