<?php
require_once(__DIR__ . '/../auth_check.php');
require_once(__DIR__ . '/../../class/db-functions.php');

header('Content-Type: application/json');

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    http_response_code(405);
    echo json_encode(['success' => false, 'message' => 'Metodo non consentito.']);
    exit;
}

$pdo = DBHandlerSelect::getInstance()->getConnection();

$id = (int)($_POST['id'] ?? 0);
if ($id <= 0) {
    echo json_encode(['success' => false, 'message' => 'ID corso non valido.']);
    exit;
}

try {
    $usage = $pdo->prepare("SELECT COUNT(*) FROM employee_trainings WHERE training_topic_id = :id");
    $usage->execute(['id' => $id]);
    if ((int)$usage->fetchColumn() > 0) {
        echo json_encode([
            'success' => false,
            'message' => 'Questo corso ha già delle registrazioni di formazione e non può essere cancellato.',
        ]);
        exit;
    }

    $stmt = $pdo->prepare("DELETE FROM training_topics WHERE id = :id");
    $stmt->execute(['id' => $id]);

    echo json_encode(['success' => true]);
} catch (Exception $e) {
    echo json_encode(['success' => false, 'message' => $e->getMessage()]);
}