<?php
require_once 'config.php';
require_once 'functions.php';

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    redirect('semesterapparat.php');
}

// Collect form data
$name = post('name');
$lastname = post('lastname');
$title = post('title');
$telno = post('telno');
$mail = post('mail');
$apparatsname = post('apparatsname');
$subject = post('subject');
$semester_type = post('semester_type');
$semester_year = post('semester_year');
$dauerapparat = isset($_POST['dauerapparat']) ? 'true' : 'false';
$message = post('message');

// Validate required fields
if (
    empty($name) || empty($lastname) || empty($telno) || empty($mail) ||
    empty($apparatsname) || empty($subject) || empty($semester_type) || empty($semester_year)
) {
    die('Fehler: Alle Pflichtfelder müssen ausgefüllt werden.');
}

// Validate email
if (!validateEmail($mail)) {
    die('Fehler: Ungültige E-Mail-Adresse.');
}

// Collect book data
$authornames = postArray('authorname');
$years = postArray('year');
$edition = postArray('edition');
$booktitles = postArray('booktitle');
$signatures = postArray('signature');

// Validate at least one book
if (empty($authornames) || count($authornames) === 0) {
    die('Fehler: Mindestens ein Medium muss angegeben werden.');
}

// Build books array
$books = [];
for ($i = 0; $i < count($authornames); $i++) {
    $books[] = [
        'authorname' => $authornames[$i] ?? '',
        'year' => $years[$i] ?? '',
        'edition' => $edition[$i] ?? '',
        'title' => $booktitles[$i] ?? '',
        'signature' => $signatures[$i] ?? ''
    ];
}

// Prepare data for XML generation
$data = [
    'name' => $name,
    'lastname' => $lastname,
    'title' => $title,
    'telno' => $telno,
    'mail' => $mail,
    'apparatsname' => $apparatsname,
    'subject' => $subject,
    'semester' => $semester_type . ' ' . $semester_year,
    'dauerapparat' => $dauerapparat,
    'message' => $message,
    'books' => $books
];

// Generate XML
$xml = generateXML($data);

// Send email
$emailSent = sendEmail('Antrag für neuen Semesterapparat', $xml);

if ($emailSent || !MAIL_ENABLED) {
    redirect('index.php?success=true');
} else {
    die('Fehler: E-Mail konnte nicht gesendet werden. Bitte versuchen Sie es später erneut.');
}