/**
  * This method creates an e-mail by referring to a view and replacing the variables. 
  * TODO: refactor to use less parameters (all in one array)?
  */
 function email_replace($view, $participant = NULL, $participation = NULL, $experiment = NULL, $testinvite = NULL, $comb_experiment = NULL, $auto = FALSE, $message = "", $language = L::Dutch)
 {
     $CI =& get_instance();
     $user = $CI->userModel->get_user_by_id(current_user_id());
     reset_language($language);
     $message_data = array();
     $message_data['auto'] = $auto;
     $message_data['message'] = $message;
     $message_data['combination'] = FALSE;
     $message_data['longitudinal'] = FALSE;
     $message_data['survey_link'] = FALSE;
     if ($user) {
         $message_data['user_username'] = $user->username;
         $message_data['user_email'] = $user->email;
     }
     if ($participant) {
         $message_data['name'] = name($participant);
         $message_data['name_first'] = $participant->firstname;
         $message_data['name_parent'] = parent_name($participant);
         $message_data['gender'] = gender_child($participant->gender);
         $message_data['gender_pos'] = gender_pos($participant->gender);
         $message_data['gender_plural'] = gender_sex($participant->gender) . 's';
         $message_data['phone'] = $participant->phone;
     }
     if ($participation) {
         $leader = $CI->userModel->get_user_by_id($participation->user_id_leader);
         $message_data['appointment'] = format_datetime($participation->appointment);
         if ($leader) {
             $message_data['leader_name'] = $leader->firstname;
         }
     }
     if ($experiment) {
         $location = $CI->locationModel->get_location_by_experiment($experiment);
         $message_data['exp_name'] = $experiment->name;
         $message_data['type'] = $experiment->type;
         $message_data['duration'] = $experiment->duration;
         $message_data['duration_total'] = $experiment->duration + INSTRUCTION_DURATION;
         $message_data['description'] = $experiment->description;
         $message_data['location'] = sprintf('%s (%s)', $location->name, $location->roomnumber);
         $message_data['caller_contacts'] = extract_callers($experiment, $comb_experiment);
     }
     if ($comb_experiment) {
         $location = $CI->locationModel->get_location_by_experiment($comb_experiment);
         $comb_participation = $CI->participationModel->get_participation($comb_experiment->id, $participant->id);
         $relation = $CI->relationModel->get_relation_by_experiments($experiment->id, $comb_experiment->id);
         $message_data['combination'] = $relation->relation === RelationType::Combination;
         $message_data['longitudinal'] = $relation->relation === RelationType::Prerequisite;
         $message_data['comb_exp_name'] = $comb_experiment->name;
         $message_data['comb_type'] = $comb_experiment->type;
         $message_data['comb_duration'] = $comb_experiment->duration;
         $message_data['comb_duration_total'] = $comb_experiment->duration + INSTRUCTION_DURATION;
         $message_data['comb_description'] = $comb_experiment->description;
         $message_data['comb_location'] = sprintf('%s (%s)', $location->name, $location->roomnumber);
         $message_data['comb_appointment'] = format_datetime($comb_participation->appointment);
     }
     if ($participant && $experiment) {
         $data = get_min_max_days($participant, $experiment);
         $message_data['min_date'] = format_date($data['min_date_js']);
         $message_data['max_date'] = format_date($data['max_date_js']);
     }
     if ($testinvite) {
         $test = $CI->testInviteModel->get_test_by_testinvite($testinvite);
         $testsurvey = $CI->testInviteModel->get_testsurvey_by_testinvite($testinvite);
         $message_data['survey_name'] = testsurvey_name($testsurvey);
         $message_data['survey_link'] = survey_link($testsurvey->limesurvey_id, $testinvite->token);
         $message_data['results_link'] = results_link($test->code, $testinvite->token);
         $message_data['whennr'] = $testsurvey->whennr;
     }
     return $CI->load->view($view, $message_data, TRUE);
 }
 /** Reschedules a participation */
 public function reschedule($participation_id)
 {
     $participation = $this->participationModel->get_participation_by_id($participation_id);
     $participant = $this->participationModel->get_participant_by_participation($participation_id);
     $experiment = $this->participationModel->get_experiment_by_participation($participation_id);
     $data = get_min_max_days($participant, $experiment);
     $data['appointment'] = output_datetime($participation->appointment, TRUE);
     $data['participation'] = $participation;
     $data['participant'] = $participant;
     $data['experiment'] = $experiment;
     $this->load->view('templates/header', $data);
     $this->load->view('participation_reschedule', $data);
     $this->load->view('templates/footer');
 }