public function addClient()
{
$caseId = CRM_Utils_Type::escape($_POST['caseID'], 'Positive');
$contactId = CRM_Utils_Type::escape($_POST['contactID'], 'Positive');
if (!$contactId || !CRM_Case_BAO_Case::accessCase($caseId)) {
CRM_Utils_System::permissionDenied();
}
$params = array('case_id' => $caseId, 'contact_id' => $contactId);
CRM_Case_BAO_Case::addCaseToContact($params);
// add case relationships
CRM_Case_BAO_Case::addCaseRelationships($caseId, $contactId);
$session = CRM_Core_Session::singleton();
$activityParams = array();
$activityParams['source_contact_id'] = $session->get('userID');
$activityParams['activity_type_id'] = CRM_Core_OptionGroup::getValue('activity_type', 'Add Client To Case', 'name');
$activityParams['activity_date_time'] = date('YmdHis');
$activityParams['status_id'] = CRM_Core_OptionGroup::getValue('activity_status', 'Completed', 'name');
$activityParams['case_id'] = $caseId;
$activityParams['is_auto'] = 0;
$activityParams['subject'] = 'Client Added To Case';
$activity = CRM_Activity_BAO_Activity::create($activityParams);
$caseParams = array('activity_id' => $activity->id, 'case_id' => $caseId);
CRM_Case_BAO_Case::processCaseActivity($caseParams);
CRM_Utils_JSON::output(TRUE);
}