<?php
require_once __DIR__ . '/../lib/auth.php';
require_login();

$id = (int)($_GET['id'] ?? 0);
if ($id <= 0) { http_response_code(400); echo 'Ungültige Anfrage.'; exit; }

$stmt = db()->prepare('SELECT filename, original_name FROM fortbildung_materials WHERE id = ?');
$stmt->execute([$id]);
$row = $stmt->fetch();
if (!$row) { http_response_code(404); echo 'Datei nicht gefunden.'; exit; }

$path = dirname(__DIR__) . '/fortbildung-materials/' . $row['filename'];
if (!is_file($path)) { http_response_code(404); echo 'Datei nicht gefunden.'; exit; }

$safe_display = addslashes($row['original_name']);
$safe_encoded = rawurlencode($row['original_name']);

header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename="' . $safe_display . '"; filename*=UTF-8\'\'' . $safe_encoded);
header('Content-Length: ' . filesize($path));
header('X-Content-Type-Options: nosniff');
header('Cache-Control: private, no-store');
readfile($path);
exit;