<?php
// Updater maintenance hook — see updater/README.md
$maintenanceFile = __DIR__ . '/updater/storage/.maintenance';
if (file_exists($maintenanceFile)) {
    http_response_code(503);
    require __DIR__ . '/updater/templates/maintenance.html';
    exit;
}

error_reporting(E_ALL);
ini_set('display_errors', 0);
ini_set('log_errors', 1);

require_once __DIR__ . '/config.php';
require_once __DIR__ . '/includes/Database.php';
require_once __DIR__ . '/includes/Auth.php';
require_once __DIR__ . '/includes/UniFiController.php';
require_once __DIR__ . '/includes/Mailer.php';
require_once __DIR__ . '/includes/Notifier.php';
require_once __DIR__ . '/includes/Captcha.php';
require_once __DIR__ . '/includes/Sms.php';
require_once __DIR__ . '/includes/Ui.php';
require_once __DIR__ . '/includes/I18n.php';

$auth = new Auth();
$db = Database::getInstance();
$mailer = new Mailer();
I18n::init();

/**
 * Session-basierter Throttle fuer die anonyme oeffentliche Voucher-Erstellung.
 * Erlaubt max. 10 Erstellungen in 10 Minuten pro Session. Verhindert, dass
 * der oeffentliche Modus zum Spammen des UniFi-Controllers missbraucht wird.
 */
function isVoucherRateLimited() {
    $window = 600;   // 10 Minuten
    $maxRequests = 10;
    $now = time();
    $timestamps = $_SESSION['voucher_create_times'] ?? [];
    $timestamps = array_values(array_filter($timestamps, function ($t) use ($now, $window) {
        return ($now - $t) < $window;
    }));
    if (count($timestamps) >= $maxRequests) {
        $_SESSION['voucher_create_times'] = $timestamps;
        return true;
    }
    $timestamps[] = $now;
    $_SESSION['voucher_create_times'] = $timestamps;
    return false;
}

/**
 * Optionales Tageslimit pro (Nicht-Admin-)Benutzer (Setting
 * user_daily_voucher_limit, 0 = aus). Verhindert übermäßige Erstellung.
 */
function userDailyLimitExceeded($db, $auth, $additional = 1) {
    if (!$auth->isLoggedIn() || $auth->isAdmin()) {
        return false;
    }
    $limit = (int)$db->getSetting('user_daily_voucher_limit', 0);
    if ($limit <= 0) {
        return false;
    }
    $uid = $_SESSION['user_id'] ?? 0;
    $today = (int)($db->fetchOne(
        "SELECT COUNT(*) c FROM vouchers WHERE user_id=? AND DATE(created_at)=CURDATE()",
        [$uid]
    )['c'] ?? 0);
    return ($today + $additional) > $limit;
}

$appTitle          = $db->getSetting('app_title', 'UniFi Voucher System');
$logoUrl           = $db->getSetting('logo_url', '');
$instructionHeader = $db->getSetting('instruction_header', '');
$instructionText   = $db->getSetting('instruction_text', '');
$publicAccess      = $db->getSetting('public_access', 0);
$smtpEnabled       = $db->getSetting('smtp_enabled', '0') === '1';
$printTemplate     = $db->getSetting('print_template', Ui::defaultPrintTemplate());
$defaultExpire     = max(1, (int)$db->getSetting('default_expire_minutes', 480));
$defaultMaxUses    = max(1, (int)$db->getSetting('default_max_uses', 1));
$maxUsesLimit      = max(1, (int)$db->getSetting('max_uses_limit', 10));

if (!$publicAccess && !$auth->isLoggedIn()) {
    header('Location: login.php');
    exit;
}

try {
    $templates = $db->fetchAll("SELECT * FROM voucher_templates WHERE is_active = 1 ORDER BY name");
} catch (Exception $e) {
    $templates = [];
}

$error        = '';
$success      = '';
$voucherCode  = '';
$voucherCreated = false;
$voucherData  = [];
$bulkVouchers = [];
$bulkCreated  = false;

if ($auth->isLoggedIn()) {
    if ($auth->isAdmin()) {
        $sites = $db->fetchAll("SELECT * FROM sites WHERE is_active = 1 ORDER BY name");
    } else {
        $sites = $db->fetchAll(
            "SELECT s.* FROM sites s INNER JOIN user_site_access usa ON s.id = usa.site_id
             WHERE s.is_active = 1 AND usa.user_id = ? ORDER BY s.name",
            [$_SESSION['user_id']]
        );
    }
} else {
    $sites = $db->fetchAll("SELECT * FROM sites WHERE is_active = 1 AND public_access = 1 ORDER BY name");
}

$autoSelectSite = (count($sites) === 1) ? $sites[0]['id'] : 0;

// Helper: create one voucher and save to DB
function doCreateVoucher($db, $site, $voucherName, $maxUses, $expireMinutes, $userId, $qos = []) {
    $datum          = date('Y-m-d');
    $fullName       = $datum . '_' . $voucherName;
    $controller     = new UniFiController(
        $site['unifi_controller_url'],
        $site['unifi_username'],
        Crypto::decrypt($site['unifi_password']),
        $site['site_id']
    );
    $voucher = $controller->createVoucher($fullName, $maxUses, $expireMinutes, $qos);
    if (!is_array($voucher) || empty($voucher['formatted_code'])) {
        throw new Exception(__('error_voucher_invalid'));
    }
    $db->execute(
        "INSERT INTO vouchers (site_id, user_id, voucher_code, voucher_name, max_uses, expire_minutes, unifi_voucher_id)
         VALUES (?, ?, ?, ?, ?, ?, ?)",
        [$site['id'], $userId, $voucher['code'], $fullName, $maxUses, $expireMinutes, $voucher['unifi_id'] ?? null]
    );
    $expiryTs = time() + ($expireMinutes * 60);
    return [
        'code'        => $voucher['formatted_code'],
        'site_name'   => $site['name'],
        'max_uses'    => $maxUses,
        'expire_min'  => $expireMinutes,
        'expiry_date' => date('d.m.Y', $expiryTs),
        'expiry_time' => date('H:i', $expiryTs),
    ];
}

// Single voucher
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['create_voucher'])) {
    if (!$publicAccess && !$auth->isLoggedIn()) {
        $error = __('error_login_req');
    } elseif (!$auth->validateCsrfToken($_POST['csrf_token'] ?? '')) {
        // CSRF fuer ALLE (auch anonyme oeffentliche Erstellung)
        $error = __('error_csrf');
    } elseif (!$auth->isLoggedIn() && isVoucherRateLimited()) {
        $error = 'Zu viele Anfragen. Bitte warten Sie einen Moment.';
    } elseif (!$auth->isLoggedIn() && !Captcha::verify($db)) {
        $error = 'Captcha-Prüfung fehlgeschlagen. Bitte erneut versuchen.';
    } else {
        try {
            $siteId        = (int)($_POST['site_id'] ?? 0);
            $voucherName   = trim((string)($_POST['voucher_name'] ?? ''));
            $maxUses       = (int)($_POST['max_uses'] ?? $defaultMaxUses);
            $expireMinutes = max(1, (int)($_POST['expire_minutes'] ?? $defaultExpire));
            $sendEmail     = isset($_POST['send_email']) && !empty($_POST['recipient_email']);
            $recipientEmail= trim((string)($_POST['recipient_email'] ?? ''));

            if (empty($voucherName)) throw new Exception(__('error_name_req'));
            if ($maxUses < 1 || $maxUses > $maxUsesLimit) throw new Exception(__('error_devices_range', ['max' => $maxUsesLimit]));
            if ($siteId <= 0) throw new Exception(__('error_site_req'));
            if ($sendEmail && !filter_var($recipientEmail, FILTER_VALIDATE_EMAIL)) throw new Exception(__('error_email_invalid'));

            if ($auth->isLoggedIn() && !$auth->hasAccessToSite($siteId)) throw new Exception(__('error_site_no_perm'));
            if (userDailyLimitExceeded($db, $auth, 1)) throw new Exception('Tageslimit für Voucher erreicht.');

            $site = $db->fetchOne("SELECT * FROM sites WHERE id = ? AND is_active = 1", [$siteId]);
            if (!$site) throw new Exception(__('error_site_not_found'));

            $userId  = $auth->isLoggedIn() ? ($_SESSION['user_id'] ?? null) : null;
            $qos = [
                'down'     => max(0, (int)($_POST['qos_down'] ?? 0)),
                'up'       => max(0, (int)($_POST['qos_up'] ?? 0)),
                'quota_mb' => max(0, (int)($_POST['qos_quota'] ?? 0)),
            ];
            $voucherData = doCreateVoucher($db, $site, $voucherName, $maxUses, $expireMinutes, $userId, $qos);
            $voucherCode  = $voucherData['code'];
            $voucherCreated = true;
            Notifier::voucherCreated(1, $site['name'], $_SESSION['user_name'] ?? null);

            $success = 'Voucher erfolgreich erstellt!';
            if ($sendEmail && !empty($recipientEmail)) {
                $mailer->sendVoucherEmail($recipientEmail, $voucherCode, $site['name'], $maxUses);
                $success .= ' E-Mail versendet.';
            }
            // Optional: Code per SMS (Twilio)
            $recipientPhone = trim((string)($_POST['recipient_phone'] ?? ''));
            if (isset($_POST['send_sms']) && $recipientPhone !== '' && Sms::enabled($db)) {
                $smsText = ($appTitle ? $appTitle . ': ' : '') . 'WLAN-Code ' . $voucherCode;
                $success .= Sms::send($db, $recipientPhone, $smsText) ? ' SMS versendet.' : ' (SMS fehlgeschlagen)';
            }
        } catch (Exception $e) {
            $error = 'Fehler: ' . $e->getMessage();
        }
    }
}

// Bulk voucher creation
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['create_bulk'])) {
    if (!$publicAccess && !$auth->isLoggedIn()) {
        $error = __('error_login_req');
    } elseif (!$auth->validateCsrfToken($_POST['csrf_token'] ?? '')) {
        // CSRF fuer ALLE (auch anonyme oeffentliche Erstellung)
        $error = __('error_csrf');
    } elseif (!$auth->isLoggedIn() && isVoucherRateLimited()) {
        $error = 'Zu viele Anfragen. Bitte warten Sie einen Moment.';
    } elseif (!$auth->isLoggedIn() && !Captcha::verify($db)) {
        $error = 'Captcha-Prüfung fehlgeschlagen. Bitte erneut versuchen.';
    } else {
        try {
            $siteId        = (int)($_POST['site_id'] ?? 0);
            $voucherName   = trim((string)($_POST['voucher_name'] ?? ''));
            $maxUses       = (int)($_POST['max_uses'] ?? $defaultMaxUses);
            $expireMinutes = max(1, (int)($_POST['expire_minutes'] ?? $defaultExpire));
            $bulkCount     = max(1, min(20, (int)($_POST['bulk_count'] ?? 1)));

            if (empty($voucherName)) throw new Exception(__('error_name_req'));
            if ($maxUses < 1 || $maxUses > $maxUsesLimit) throw new Exception(__('error_devices_range', ['max' => $maxUsesLimit]));
            if ($siteId <= 0) throw new Exception(__('error_site_req'));
            if ($auth->isLoggedIn() && !$auth->hasAccessToSite($siteId)) throw new Exception(__('error_site_no_perm'));
            if (userDailyLimitExceeded($db, $auth, $bulkCount)) throw new Exception('Tageslimit für Voucher erreicht.');

            $site = $db->fetchOne("SELECT * FROM sites WHERE id = ? AND is_active = 1", [$siteId]);
            if (!$site) throw new Exception(__('error_site_not_found'));

            $userId = $auth->isLoggedIn() ? ($_SESSION['user_id'] ?? null) : null;
            $qos = [
                'down'     => max(0, (int)($_POST['qos_down'] ?? 0)),
                'up'       => max(0, (int)($_POST['qos_up'] ?? 0)),
                'quota_mb' => max(0, (int)($_POST['qos_quota'] ?? 0)),
            ];

            for ($i = 0; $i < $bulkCount; $i++) {
                $bulkVouchers[] = doCreateVoucher($db, $site, $voucherName . '_' . ($i + 1), $maxUses, $expireMinutes, $userId, $qos);
            }

            Notifier::voucherCreated($bulkCount, $site['name'], $_SESSION['user_name'] ?? null);
            $bulkCreated = true;
            $success = str_replace('{count}', $bulkCount, __('bulk_success'));
        } catch (Exception $e) {
            $error = 'Fehler: ' . $e->getMessage();
        }
    }
}

$currentUser = $auth->isLoggedIn() ? $auth->getCurrentUser() : null;

// Captcha nur für anonyme öffentliche Erstellung
$captchaMode     = !$auth->isLoggedIn() ? Captcha::mode($db) : 'off';
$captchaQuestion = $captchaMode === 'math' ? Captcha::newMathChallenge() : '';
$hcaptchaSiteKey = $captchaMode === 'hcaptcha' ? $db->getSetting('captcha_site_key', '') : '';
$smsEnabled = Sms::enabled($db);
$captchaHtml = '';
if ($captchaMode === 'math') {
    $captchaHtml = '<div class="form-group"><label>Sicherheitsfrage: Wie viel ist ' . htmlspecialchars($captchaQuestion) . '?</label>'
        . '<input type="text" name="captcha" inputmode="numeric" required></div>';
} elseif ($captchaMode === 'hcaptcha' && $hcaptchaSiteKey !== '') {
    $captchaHtml = '<div class="form-group"><div class="h-captcha" data-sitekey="' . htmlspecialchars($hcaptchaSiteKey) . '"></div></div>';
}

// Build print HTML for each voucher
function buildPrintCard($template, $data, $instructionHeader, $instructionText, $appTitle) {
    $instructions = $instructionHeader || $instructionText
        ? htmlspecialchars($instructionHeader) . "\n" . $instructionText
        : '';
    // {QR_CODE} wird erst im Browser gefuellt (siehe renderPrintQr()).
    $qr = '<div class="print-qr" data-code="' . htmlspecialchars(str_replace('-', '', (string)$data['code']), ENT_QUOTES) . '"></div>';

    return str_replace(
        ['{QR_CODE}', '{VOUCHER_CODE}', '{SITE_NAME}', '{MAX_USES}', '{APP_TITLE}', '{INSTRUCTIONS}', '{EXPIRY_DATE}', '{EXPIRY_TIME}'],
        [$qr, $data['code'], htmlspecialchars($data['site_name']), $data['max_uses'], htmlspecialchars($appTitle), $instructions, $data['expiry_date'], $data['expiry_time']],
        $template
    );
}
?>
<!DOCTYPE html>
<html lang="<?= I18n::getLanguage() ?>">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title><?= htmlspecialchars($appTitle) ?></title>
    <?= Ui::head($db) ?>
    <?php if ($captchaMode === 'hcaptcha' && $hcaptchaSiteKey !== ''): ?>
    <script src="https://js.hcaptcha.com/1/api.js" async defer></script>
    <?php endif; ?>
    <?php if ($voucherCreated || $bulkCreated): ?>
    <?= Ui::script('assets/vendor/qrcodejs/qrcode.min.js') ?>
    <?php endif; ?>
    <style>
        /* Seitenspezifisch: Druckansicht der Voucher-Karten.
           Die Druckvorlage ist am Bildschirm ausgeblendet und erscheint nur im Druck. */
        #printArea { display: none; }
        @media print {
            #printArea { display: block; }
            body * { visibility: hidden; }
            #printArea, #printArea * { visibility: visible; }
            #printArea { position: absolute; left: 0; top: 0; width: 100%; background: #fff; }
            .no-print { display: none !important; }
            .print-page-break { page-break-after: always; }
        }
    </style>
</head>
<body class="app-body">

<a class="skip-link no-print" href="#main-content"><?= __('a11y_skip') ?></a>
<header class="app-topbar no-print">
    <a href="index.php" class="brand">
        <span class="brand-mark"><i class="fas fa-wifi" aria-hidden="true"></i></span>
        <span class="brand-name"><?= htmlspecialchars($appTitle) ?></span>
    </a>
    <div class="app-actions">
        <div class="lang-switcher" role="group" aria-label="<?= __('a11y_language') ?>">
            <?php foreach (I18n::getAvailable() as $code => $label): ?>
            <button class="lang-btn <?= I18n::getLanguage() === $code ? 'active' : '' ?>"
                    onclick="switchLanguage('<?= $code ?>')"><?= strtoupper($code) ?></button>
            <?php endforeach; ?>
        </div>
        <button id="darkModeBtn" class="dark-mode-toggle" onclick="toggleDarkMode()" aria-label="<?= __('a11y_theme') ?>" title="<?= __('a11y_theme') ?>">
            <i class="fas fa-moon" aria-hidden="true"></i>
        </button>
        <?php if ($currentUser): ?>
            <?php if ($auth->isAdmin()): ?>
            <a href="admin/" class="btn btn-secondary">
                <i class="fas fa-sliders" aria-hidden="true"></i> <span class="hide-mobile"><?= __('nav_administration') ?></span>
            </a>
            <?php endif; ?>
            <div class="user-menu">
                <div class="user-avatar"><?= strtoupper(mb_substr($currentUser['name'], 0, 1)) ?></div>
                <div class="user-name hide-mobile"><?= htmlspecialchars($currentUser['name']) ?></div>
                <a href="logout.php" class="icon-btn" title="<?= __('btn_logout') ?>" aria-label="<?= __('btn_logout') ?>" style="width:28px;height:28px;font-size:11px;">
                    <i class="fas fa-arrow-right-from-bracket" aria-hidden="true"></i>
                </a>
            </div>
        <?php elseif ($publicAccess): ?>
            <a href="login.php" class="btn btn-secondary">
                <i class="fas fa-right-to-bracket" aria-hidden="true"></i> <?= __('btn_login') ?>
            </a>
        <?php endif; ?>
    </div>
</header>

<main class="container" id="main-content">
    <?php if ($logoUrl && !$voucherCreated && !$bulkCreated): ?>
        <img src="<?= htmlspecialchars(Ui::mediaUrl($logoUrl)) ?>" alt="Logo" class="logo">
    <?php endif; ?>

    <?php if (!$voucherCreated && !$bulkCreated): ?>
    <div class="app-card-head">
        <h1><?= htmlspecialchars($appTitle) ?></h1>
        <p><?= __('app_subtitle') ?></p>
    </div>
    <?php endif; ?>

    <?php if ($error): ?>
        <div class="alert alert-error"><?= htmlspecialchars($error) ?></div>
    <?php endif; ?>

    <?php if ($voucherCreated): ?>
        <div id="printArea">
            <?= buildPrintCard($printTemplate, $voucherData, $instructionHeader, $instructionText, $appTitle) ?>
        </div>

        <div class="voucher-result no-print">
            <div class="result-label"><i class="fas fa-circle-check" aria-hidden="true"></i> <?= __('voucher_success_title') ?></div>
            <div class="voucher-code" id="voucherCode" onclick="copyCode()" title="<?= __('js_click_to_copy') ?>">
                <?= htmlspecialchars($voucherCode) ?>
            </div>
            <div class="voucher-info">
                <i class="fas fa-copy" aria-hidden="true"></i> <?= __('voucher_copy_hint') ?>
            </div>
            <div class="voucher-meta">
                <span><i class="fas fa-clock" aria-hidden="true"></i> <?= str_replace('{minutes}', $voucherData['expire_min'], __('voucher_validity')) ?></span>
                <span><i class="fas fa-location-dot" aria-hidden="true"></i> <?= htmlspecialchars($voucherData['site_name']) ?></span>
                <span><i class="fas fa-mobile-screen" aria-hidden="true"></i> <?= (int)$voucherData['max_uses'] ?> <?= __('label_devices') ?></span>
            </div>
            <div class="ticket-divider"></div>
            <div class="qr-wrapper no-print">
                <div id="qrcode"></div>
                <div class="qr-label"><?= __('voucher_qr_label') ?></div>
            </div>
        </div>

        <?php if ($instructionHeader || $instructionText): ?>
        <div class="instruction-box no-print">
            <?php if ($instructionHeader): ?><h3><?= htmlspecialchars($instructionHeader) ?></h3><?php endif; ?>
            <?php if ($instructionText): ?><div><?= $instructionText ?></div><?php endif; ?>
        </div>
        <?php endif; ?>

        <div class="no-print" style="display:flex;gap:10px;margin-top:18px;">
            <form method="get" style="flex:1;">
                <button type="submit" class="btn btn-primary btn-lg btn-block">
                    <i class="fas fa-plus" aria-hidden="true"></i> <?= __('btn_new_code') ?>
                </button>
            </form>
            <button onclick="window.print()" class="btn btn-secondary btn-lg">
                <i class="fas fa-print" aria-hidden="true"></i> <?= __('voucher_print_btn') ?>
            </button>
        </div>

    <?php elseif ($bulkCreated): ?>
        <div class="app-card-head">
            <h1><?= str_replace('{count}', count($bulkVouchers), __('bulk_results')) ?></h1>
            <p><?= __('bulk_results_hint') ?></p>
        </div>

        <div id="printArea">
            <?php foreach ($bulkVouchers as $idx => $bv): ?>
            <div class="<?= $idx > 0 ? 'print-page-break' : '' ?>">
                <?= buildPrintCard($printTemplate, $bv, $instructionHeader, $instructionText, $appTitle) ?>
            </div>
            <?php endforeach; ?>
        </div>

        <div class="no-print">
            <table class="bulk-table">
                <thead>
                    <tr>
                        <th>#</th>
                        <th><?= __('label_code') ?></th>
                        <th><?= __('label_site') ?></th>
                        <th><?= __('label_expires') ?></th>
                    </tr>
                </thead>
                <tbody>
                    <?php foreach ($bulkVouchers as $i => $bv): ?>
                    <tr>
                        <td><?= $i + 1 ?></td>
                        <td>
                            <code onclick="copyToClipboard('<?= addslashes($bv['code']) ?>', '<?= __('js_copied') ?>')"
                                  title="<?= __('js_click_to_copy') ?>"><?= htmlspecialchars($bv['code']) ?></code>
                        </td>
                        <td><?= htmlspecialchars($bv['site_name']) ?></td>
                        <td><?= $bv['expiry_date'] ?> <?= $bv['expiry_time'] ?></td>
                    </tr>
                    <?php endforeach; ?>
                </tbody>
            </table>
            <p class="copy-hint"><i class="fas fa-copy" aria-hidden="true"></i> <?= __('voucher_copy_hint') ?></p>
        </div>

        <div class="no-print" style="display:flex;gap:10px;margin-top:20px;">
            <button onclick="window.print()" class="btn btn-primary btn-lg" style="flex:1;">
                <i class="fas fa-print" aria-hidden="true"></i> <?= __('bulk_print_all') ?>
            </button>
            <form method="get" style="flex:1;">
                <button type="submit" class="btn btn-secondary btn-lg btn-block"><?= __('btn_new_code') ?></button>
            </form>
        </div>

    <?php elseif (empty($sites)): ?>
        <div class="empty-state">
            <div class="empty-icon"><i class="fas fa-wifi" aria-hidden="true"></i></div>
            <p><?= __('voucher_no_sites') ?><br>
            <?php if ($auth->isAdmin()): ?>
                <a href="admin/" style="color:var(--accent);"><?= __('voucher_no_sites_admin') ?></a>
            <?php else: ?>
                <?= __('voucher_no_sites_user') ?>
            <?php endif; ?>
            </p>
        </div>

    <?php else: ?>

        <?php if ($auth->isLoggedIn()): ?>
        <div class="mode-tabs no-print">
            <button class="mode-tab active" id="tab-single" onclick="switchMode('single')"><?= __('bulk_tab') ?></button>
            <button class="mode-tab" id="tab-bulk" onclick="switchMode('bulk')"><?= __('bulk_tab_bulk') ?></button>
        </div>
        <?php endif; ?>

        <?php if (!empty($templates)): ?>
        <div class="template-dropdown">
            <label for="template_select"><?= __('voucher_template_label') ?></label>
            <select id="template_select" onchange="applyTemplate(this)">
                <option value=""><?= __('voucher_template_select') ?></option>
                <?php foreach ($templates as $tpl): ?>
                <option value="<?= (int)$tpl['id'] ?>"
                        data-max-uses="<?= (int)$tpl['max_uses'] ?>"
                        data-expire="<?= (int)$tpl['expire_minutes'] ?>"
                        data-qos-down="<?= (int)($tpl['qos_rate_max_down'] ?? 0) ?>"
                        data-qos-up="<?= (int)($tpl['qos_rate_max_up'] ?? 0) ?>"
                        data-qos-quota="<?= (int)($tpl['qos_usage_quota'] ?? 0) ?>"
                        data-desc="<?= htmlspecialchars($tpl['description'] ?? '') ?>">
                    <?= htmlspecialchars($tpl['name']) ?> –
                    <?= (int)$tpl['max_uses'] ?> <?= __('label_devices') ?>,
                    <?= (int)$tpl['expire_minutes'] ?> <?= __('minutes_short') ?>
                </option>
                <?php endforeach; ?>
            </select>
            <div class="template-hint" id="template_desc"></div>
        </div>
        <?php endif; ?>

        <!-- Single voucher form -->
        <div id="mode-single">
            <form method="post" id="voucherForm">
                <input type="hidden" name="create_voucher" value="1">
                <input type="hidden" name="expire_minutes" id="expire_minutes" value="<?= $defaultExpire ?>">
                <input type="hidden" name="csrf_token" value="<?= htmlspecialchars($auth->getCsrfToken()) ?>">
                <input type="hidden" name="qos_down" class="qos-down-field" value="0">
                <input type="hidden" name="qos_up" class="qos-up-field" value="0">
                <input type="hidden" name="qos_quota" class="qos-quota-field" value="0">
                <?= $captchaHtml ?>

                <div class="form-group">
                    <label for="voucher_name"><?= __('voucher_name_label') ?></label>
                    <input type="text" id="voucher_name" name="voucher_name"
                           placeholder="<?= __('voucher_name_hint') ?>" required>
                </div>

                <div class="form-group">
                    <label for="max_uses"><?= __('voucher_devices_label') ?></label>
                    <input type="number" id="max_uses" name="max_uses"
                           min="1" max="<?= $maxUsesLimit ?>" value="<?= $defaultMaxUses ?>" required>
                </div>

                <div class="form-group">
                    <label for="site_id"><?= __('voucher_site_label') ?></label>
                    <select id="site_id" name="site_id" required>
                        <?php if (count($sites) > 1): ?>
                            <option value=""><?= __('voucher_site_select') ?></option>
                        <?php endif; ?>
                        <?php foreach ($sites as $site): ?>
                            <option value="<?= (int)$site['id'] ?>" <?= ($autoSelectSite == $site['id']) ? 'selected' : '' ?>>
                                <?= htmlspecialchars($site['name']) ?>
                            </option>
                        <?php endforeach; ?>
                    </select>
                </div>

                <?php if ($smtpEnabled): ?>
                <div class="email-option" id="email-option-box">
                    <div class="email-checkbox-wrapper">
                        <input type="checkbox" id="send_email" name="send_email" onchange="toggleEmailField()">
                        <label for="send_email">
                            <i class="fas fa-envelope" style="color:var(--accent);" aria-hidden="true"></i> <?= __('voucher_email_send') ?>
                        </label>
                    </div>
                    <div class="email-input-wrapper" id="email_field">
                        <div style="margin-top:12px;">
                            <label for="recipient_email"><?= __('voucher_email_label') ?></label>
                            <input type="email" id="recipient_email" name="recipient_email"
                                   placeholder="<?= __('voucher_email_hint') ?>">
                        </div>
                    </div>
                </div>
                <?php endif; ?>

                <?php if ($smsEnabled): ?>
                <div class="email-option">
                    <div class="email-checkbox-wrapper">
                        <input type="checkbox" id="send_sms" name="send_sms" onchange="document.getElementById('sms_field').style.display=this.checked?'block':'none'">
                        <label for="send_sms"><i class="fas fa-comment-sms" style="color:var(--accent);" aria-hidden="true"></i> Code per SMS versenden</label>
                    </div>
                    <div id="sms_field" style="display:none;margin-top:12px;">
                        <label for="recipient_phone">Telefonnummer (international, z.B. +49170…)</label>
                        <input type="tel" id="recipient_phone" name="recipient_phone" placeholder="+49170123456">
                    </div>
                </div>
                <?php endif; ?>

                <button type="submit" class="btn btn-primary btn-lg btn-block" id="submitBtn">
                    <i class="fas fa-ticket" aria-hidden="true"></i> <?= __('voucher_create_btn') ?>
                </button>
            </form>
        </div>

        <!-- Bulk creation form -->
        <div id="mode-bulk" style="display:none;">
            <form method="post" id="bulkForm">
                <input type="hidden" name="create_bulk" value="1">
                <input type="hidden" name="expire_minutes" id="bulk_expire_minutes" value="<?= $defaultExpire ?>">
                <input type="hidden" name="csrf_token" value="<?= htmlspecialchars($auth->getCsrfToken()) ?>">
                <input type="hidden" name="qos_down" class="qos-down-field" value="0">
                <input type="hidden" name="qos_up" class="qos-up-field" value="0">
                <input type="hidden" name="qos_quota" class="qos-quota-field" value="0">
                <?= $captchaHtml ?>

                <div class="form-group">
                    <label for="bulk_count"><?= __('bulk_quantity') ?></label>
                    <input type="number" id="bulk_count" name="bulk_count"
                           min="1" max="20" value="5" required>
                    <p class="form-hint"><?= __('bulk_quantity_hint') ?></p>
                </div>

                <div class="form-group">
                    <label for="bulk_voucher_name"><?= __('bulk_name_prefix') ?></label>
                    <input type="text" id="bulk_voucher_name" name="voucher_name"
                           placeholder="<?= __('voucher_name_hint') ?>" required>
                </div>

                <div class="form-group">
                    <label for="bulk_max_uses"><?= __('voucher_devices_label') ?></label>
                    <input type="number" id="bulk_max_uses" name="max_uses"
                           min="1" max="<?= $maxUsesLimit ?>" value="<?= $defaultMaxUses ?>" required>
                </div>

                <div class="form-group">
                    <label for="bulk_site_id"><?= __('voucher_site_label') ?></label>
                    <select id="bulk_site_id" name="site_id" required>
                        <?php if (count($sites) > 1): ?>
                            <option value=""><?= __('voucher_site_select') ?></option>
                        <?php endif; ?>
                        <?php foreach ($sites as $site): ?>
                            <option value="<?= (int)$site['id'] ?>" <?= ($autoSelectSite == $site['id']) ? 'selected' : '' ?>>
                                <?= htmlspecialchars($site['name']) ?>
                            </option>
                        <?php endforeach; ?>
                    </select>
                </div>

                <button type="submit" class="btn btn-primary btn-lg btn-block" id="bulkSubmitBtn">
                    <?= str_replace('{count}', '<span id="bulkCountLabel">5</span>', __('bulk_create_btn')) ?>
                </button>
            </form>
        </div>

        <?php if ($instructionHeader || $instructionText): ?>
        <div class="instruction-box" style="margin-top:25px;">
            <?php if ($instructionHeader): ?><h3><?= htmlspecialchars($instructionHeader) ?></h3><?php endif; ?>
            <?php if ($instructionText): ?><div><?= $instructionText ?></div><?php endif; ?>
        </div>
        <?php endif; ?>

    <?php endif; ?>
</main>

<footer class="app-footer no-print"><?= Ui::credit() ?></footer>

<div id="toast-container" role="status" aria-live="polite"></div>
<script src="assets/global.js"></script>
<script>
    <?php if ($voucherCreated || $bulkCreated): ?>
    // QR-Codes der Druckkarten erzeugen (im Browser, ohne externen Dienst)
    function renderPrintQr() {
        document.querySelectorAll('.print-qr').forEach(function (el) {
            if (el.dataset.done) return;
            el.dataset.done = '1';
            new QRCode(el, {
                text: el.dataset.code || '',
                width: 132, height: 132,
                colorDark: '#101625', colorLight: '#ffffff',
                correctLevel: QRCode.CorrectLevel.M
            });
        });
    }
    document.addEventListener('DOMContentLoaded', renderPrintQr);
    <?php endif; ?>

    <?php if ($voucherCreated): ?>
    document.addEventListener('DOMContentLoaded', function() {
        new QRCode(document.getElementById('qrcode'), {
            text: '<?= addslashes($voucherCode) ?>',
            width: 160, height: 160,
            colorDark: '#101625', colorLight: '#ffffff',
            correctLevel: QRCode.CorrectLevel.M
        });
    });

    function copyCode() {
        copyToClipboard('<?= addslashes($voucherCode) ?>', '<?= __('js_code_copied') ?>');
    }
    <?php endif; ?>

    function toggleEmailField() {
        const cb = document.getElementById('send_email');
        const field = document.getElementById('email_field');
        const box = document.getElementById('email-option-box');
        const input = document.getElementById('recipient_email');
        if (!cb || !field) return;
        if (cb.checked) {
            field.classList.add('show');
            box.classList.add('active');
            input.required = true;
            setTimeout(() => input.focus(), 300);
        } else {
            field.classList.remove('show');
            box.classList.remove('active');
            input.required = false;
        }
    }

    function switchMode(mode) {
        document.getElementById('mode-single').style.display = mode === 'single' ? '' : 'none';
        document.getElementById('mode-bulk').style.display   = mode === 'bulk' ? '' : 'none';
        document.getElementById('tab-single').classList.toggle('active', mode === 'single');
        document.getElementById('tab-bulk').classList.toggle('active', mode === 'bulk');
    }

    function applyTemplate(select) {
        const opt = select.selectedOptions[0];
        const expire = opt.value ? parseInt(opt.dataset.expire) : <?= $defaultExpire ?>;
        const maxUses = opt.value ? parseInt(opt.dataset.maxUses) : <?= $defaultMaxUses ?>;

        document.getElementById('expire_minutes').value = expire;
        document.getElementById('bulk_expire_minutes').value = expire;
        const muEl = document.getElementById('max_uses');
        if (muEl) muEl.value = maxUses;
        const bmuEl = document.getElementById('bulk_max_uses');
        if (bmuEl) bmuEl.value = maxUses;

        const qosDown  = opt.value ? (parseInt(opt.dataset.qosDown)  || 0) : 0;
        const qosUp    = opt.value ? (parseInt(opt.dataset.qosUp)    || 0) : 0;
        const qosQuota = opt.value ? (parseInt(opt.dataset.qosQuota) || 0) : 0;
        document.querySelectorAll('.qos-down-field').forEach(el => el.value = qosDown);
        document.querySelectorAll('.qos-up-field').forEach(el => el.value = qosUp);
        document.querySelectorAll('.qos-quota-field').forEach(el => el.value = qosQuota);

        const descEl = document.getElementById('template_desc');
        if (descEl) descEl.textContent = opt.dataset.desc || '';
    }

    // Bulk count label sync
    const bulkCountInput = document.getElementById('bulk_count');
    const bulkCountLabel = document.getElementById('bulkCountLabel');
    if (bulkCountInput && bulkCountLabel) {
        bulkCountInput.addEventListener('input', function() {
            bulkCountLabel.textContent = this.value;
        });
    }

    // Form submit loading states
    document.getElementById('voucherForm')?.addEventListener('submit', function(e) {
        const btn = document.getElementById('submitBtn');
        if (!btn || btn.disabled) { e.preventDefault(); return; }
        btn.disabled = true;
        btn.innerHTML = '<i class="fas fa-circle-notch fa-spin" aria-hidden="true"></i> <?= __('voucher_creating') ?>';
    });

    document.getElementById('bulkForm')?.addEventListener('submit', function(e) {
        const btn = document.getElementById('bulkSubmitBtn');
        if (!btn || btn.disabled) { e.preventDefault(); return; }
        const count = document.getElementById('bulk_count').value;
        btn.disabled = true;
        btn.innerHTML = '<i class="fas fa-circle-notch fa-spin" aria-hidden="true"></i> <?= addslashes(str_replace('{count}', "' + count + '", __('bulk_creating'))) ?>';
    });

    document.addEventListener('DOMContentLoaded', function() {
        toggleEmailField?.();
    });
</script>
</body>
</html>