Show public OQRS link if at least one callsign has OQRS activated

application/controllers/Visitor.php

@@ -432,4 +432,14 @@ class Visitor extends CI_Controller {
 		$this->load->view('visitor/layout/footer');
 	}
 
+	public function oqrs_enabled($slug) {
+		$this->load->model('oqrs_model');
+		$this->load->model('Logbooks_model');
+		$logbook_id = $this->Logbooks_model->public_slug_exists_logbook_id($slug);
+		if (!empty($this->oqrs_model->getOqrsStationsFromSlug($logbook_id))) {
+			return true;
+		} else {
+			return false;
+		}
+	}
 }

application/models/Oqrs_model.php

@@ -249,4 +249,16 @@ class Oqrs_model extends CI_Model {
 
 		return '';
 	}
+
+	function getOqrsStationsFromSlug($logbook_id) {
+		$sql = 'SELECT station_callsign FROM `station_logbooks_relationship` JOIN `station_profile` ON station_logbooks_relationship.station_location_id = station_profile.station_id WHERE station_profile.oqrs = 1 AND station_logbook_id = '.$logbook_id.';';
+
+		$query = $this->db->query($sql);
+
+		if ($query->num_rows() > 0) {
+			return true;
+		} else {
+			return false;
+		}
+	}
 }

application/views/visitor/layout/header.php

@@ -49,6 +49,14 @@
 		<li class="nav-item">
 			<a class="nav-link" href="<?php echo site_url('visitor/satellites/'.$slug);?>">Gridsquares</a>
 		</li>
+		<?php
+		$this->CI =& get_instance();
+		if ($this->CI->oqrs_enabled($slug)) {
+		?>
+		<li class="nav-item">
+			<a class="nav-link" href="<?php echo site_url('oqrs');?>">OQRS</a>
+		</li>
+		<?php } ?>
 		<li class="nav-item">
 			 <a class="btn btn-outline-primary" href="<?php echo site_url('user/login');?>">Login</a>
 		</li>