added teacher and option teacher in school

public/options_save.php

@@ -1,33 +1,33 @@
 <?php
 require_once('include/headscript.php');
 
+$pdo = DBHandlerSelect::getInstance()->getConnection();
+
 if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
-    header("Location: options.php");
-    exit();
+    header('Location: options.php');
+    exit;
 }
 
-$conn = new mysqli($servername, $username, $password, $dbname);
-if ($conn->connect_error) {
-    header("Location: options.php?message=error");
-    exit();
-}
+$waiting     = isset($_POST['waitinglist_enabled']) ? 'Y' : 'N';
+$showTeacher = isset($_POST['show_teacher']) ? 'Y' : 'N';
+$maxCancel   = max(0, (int) ($_POST['maxbeforetimecancell'] ?? 0));
 
-// Checkbox non spuntata = nessun invio -> default 'N'
-$waitingEnabled = (isset($_POST['waitinglist_enabled']) && $_POST['waitinglist_enabled'] === 'Y') ? 'Y' : 'N';
-$maxCancel      = isset($_POST['maxbeforetimecancell']) ? (string) (int) $_POST['maxbeforetimecancell'] : '0';
+try {
+    $exists = (int) $pdo->query("SELECT COUNT(*) AS c FROM `option`")->fetch()['c'] > 0;
 
-// Aggiorna l'unico record di option (idption = 1)
-$stmt = $conn->prepare("UPDATE `option` SET waitinglist_enabled = ?, maxbeforetimecancell = ? WHERE idption = 1");
-$stmt->bind_param("ss", $waitingEnabled, $maxCancel);
+    if ($exists) {
+        $st = $pdo->prepare("UPDATE `option`
+                             SET waitinglist_enabled = :w, show_teacher = :s, maxbeforetimecancell = :m
+                             LIMIT 1");
+    } else {
+        $st = $pdo->prepare("INSERT INTO `option` (waitinglist_enabled, show_teacher, maxbeforetimecancell)
+                             VALUES (:w, :s, :m)");
+    }
+    $st->execute([':w' => $waiting, ':s' => $showTeacher, ':m' => (string) $maxCancel]);
 
-if ($stmt->execute()) {
-    $stmt->close();
-    $conn->close();
-    header("Location: optionsschool.php?message=success");
-    exit();
-} else {
-    $stmt->close();
-    $conn->close();
-    header("Location: optionsschool.php?message=error");
-    exit();
+    header('Location: optionsschool.php?message=success');
+} catch (Throwable $e) {
+    error_log('options_save: ' . $e->getMessage());
+    header('Location: options.php?message=error');
 }
+exit;