/**
  * Determine if recurring parameters need to be added to the form parameters.
  *
  *  - is_recur
  *  - frequency_interval
  *  - frequency_unit
  *
  * For membership this is based on the membership type.
  *
  * This needs to be done before processing the pre-approval redirect where relevant on the main page or before any payment processing.
  *
  * Arguably the form should start to build $this->_params in the pre-process main page & use that array consistently throughout.
  */
 protected function setRecurringMembershipParams()
 {
     $selectedMembershipTypeID = CRM_Utils_Array::value('selectMembership', $this->_params);
     if ($selectedMembershipTypeID) {
         // @todo the price_x fields will ALWAYS allow us to determine the membership - so we should ignore
         // 'selectMembership' and calculate from the price_x fields so we have one method that always works
         // this is lazy & only catches when selectMembership is set, but the worst of all worlds would be to fix
         // this with an else (calculate for price set).
         $membershipTypes = CRM_Price_BAO_PriceSet::getMembershipTypesFromPriceSet($this->_priceSetId);
         if (in_array($selectedMembershipTypeID, $membershipTypes['autorenew_required']) || in_array($selectedMembershipTypeID, $membershipTypes['autorenew_optional']) && !empty($this->_params['is_recur'])) {
             $this->_params['auto_renew'] = TRUE;
         }
     }
     if ((!empty($this->_params['selectMembership']) || !empty($this->_params['priceSetId'])) && !empty($this->_paymentProcessor['is_recur']) && CRM_Utils_Array::value('auto_renew', $this->_params) && empty($this->_params['is_recur']) && empty($this->_params['frequency_interval'])) {
         $this->_params['is_recur'] = $this->_values['is_recur'] = 1;
         // check if price set is not quick config
         if (!empty($this->_params['priceSetId']) && !CRM_Core_DAO::getFieldValue('CRM_Price_DAO_PriceSet', $this->_params['priceSetId'], 'is_quick_config')) {
             list($this->_params['frequency_interval'], $this->_params['frequency_unit']) = CRM_Price_BAO_PriceSet::getRecurDetails($this->_params['priceSetId']);
         } else {
             // FIXME: set interval and unit based on selected membership type
             $this->_params['frequency_interval'] = CRM_Core_DAO::getFieldValue('CRM_Member_DAO_MembershipType', $this->_params['selectMembership'], 'duration_interval');
             $this->_params['frequency_unit'] = CRM_Core_DAO::getFieldValue('CRM_Member_DAO_MembershipType', $this->_params['selectMembership'], 'duration_unit');
         }
     }
 }