/**
  * Delete a contact and all its associated records.
  *
  * @param int $id
  *   Id of the contact to delete.
  * @param bool $restore
  *   Whether to actually restore, not delete.
  * @param bool $skipUndelete
  *   Whether to force contact delete or not.
  *
  * @return bool
  *   Was contact deleted?
  */
 public static function deleteContact($id, $restore = FALSE, $skipUndelete = FALSE)
 {
     if (!$id) {
         return FALSE;
     }
     // If trash is disabled in system settings then we always skip
     if (!CRM_Core_BAO_Setting::getItem(CRM_Core_BAO_Setting::SYSTEM_PREFERENCES_NAME, 'contact_undelete', NULL, 1)) {
         $skipUndelete = TRUE;
     }
     // make sure we have edit permission for this contact
     // before we delete
     if ($skipUndelete && !CRM_Core_Permission::check('delete contacts') || $restore && !CRM_Core_Permission::check('access deleted contacts')) {
         return FALSE;
     }
     // CRM-12929
     // Restrict contact to be delete if contact has financial trxns
     $error = NULL;
     if ($skipUndelete && CRM_Financial_BAO_FinancialItem::checkContactPresent(array($id), $error)) {
         return FALSE;
     }
     // make sure this contact_id does not have any membership types
     $membershipTypeID = CRM_Core_DAO::getFieldValue('CRM_Member_DAO_MembershipType', $id, 'id', 'member_of_contact_id');
     if ($membershipTypeID) {
         return FALSE;
     }
     $contact = new CRM_Contact_DAO_Contact();
     $contact->id = $id;
     if (!$contact->find(TRUE)) {
         return FALSE;
     }
     $contactType = $contact->contact_type;
     // currently we only clear employer cache.
     // we are now deleting inherited membership if any.
     if ($contact->contact_type == 'Organization') {
         $action = $restore ? CRM_Core_Action::ENABLE : CRM_Core_Action::DISABLE;
         $relationshipDtls = CRM_Contact_BAO_Relationship::getRelationship($id);
         if (!empty($relationshipDtls)) {
             foreach ($relationshipDtls as $rId => $details) {
                 CRM_Contact_BAO_Relationship::disableEnableRelationship($rId, $action);
             }
         }
         CRM_Contact_BAO_Contact_Utils::clearAllEmployee($id);
     }
     if ($restore) {
         return self::contactTrashRestore($contact, TRUE);
     }
     // start a new transaction
     $transaction = new CRM_Core_Transaction();
     if ($skipUndelete) {
         CRM_Utils_Hook::pre('delete', $contactType, $id, CRM_Core_DAO::$_nullArray);
         //delete billing address if exists.
         CRM_Contribute_BAO_Contribution::deleteAddress(NULL, $id);
         // delete the log entries since we dont have triggers enabled as yet
         $logDAO = new CRM_Core_DAO_Log();
         $logDAO->entity_table = 'civicrm_contact';
         $logDAO->entity_id = $id;
         $logDAO->delete();
         // delete contact participants CRM-12155
         CRM_Event_BAO_Participant::deleteContactParticipant($id);
         // delete contact contributions CRM-12155
         CRM_Contribute_BAO_Contribution::deleteContactContribution($id);
         // do activity cleanup, CRM-5604
         CRM_Activity_BAO_Activity::cleanupActivity($id);
         // delete all notes related to contact
         CRM_Core_BAO_Note::cleanContactNotes($id);
         // delete cases related to contact
         $contactCases = CRM_Case_BAO_Case::retrieveCaseIdsByContactId($id);
         if (!empty($contactCases)) {
             foreach ($contactCases as $caseId) {
                 //check if case is associate with other contact or not.
                 $caseContactId = CRM_Case_BAO_Case::getCaseClients($caseId);
                 if (count($caseContactId) <= 1) {
                     CRM_Case_BAO_Case::deleteCase($caseId);
                 }
             }
         }
         $contact->delete();
     } else {
         self::contactTrashRestore($contact);
     }
     //delete the contact id from recently view
     CRM_Utils_Recent::delContact($id);
     // Update the group contact cache
     if ($restore) {
         CRM_Contact_BAO_GroupContactCache::remove();
     } else {
         CRM_Contact_BAO_GroupContactCache::removeContact($id);
     }
     // delete any dupe cache entry
     CRM_Core_BAO_PrevNextCache::deleteItem($id);
     $transaction->commit();
     if ($skipUndelete) {
         CRM_Utils_Hook::post('delete', $contactType, $contact->id, $contact);
     }
     // also reset the DB_DO global array so we can reuse the memory
     // http://issues.civicrm.org/jira/browse/CRM-4387
     CRM_Core_DAO::freeResult();
     return TRUE;
 }