<?php

declare(strict_types=1);

require_once dirname(__DIR__, 3) . '/src/App/bootstrap.php';

use App\ConfigLoader;
use App\AccountGate;
use App\RegistrationService;

session_start();

$projectRoot = dirname(__DIR__, 3);
$accountGate = new AccountGate(ConfigLoader::load($projectRoot, 'registration'));
$registration = new RegistrationService($projectRoot, ConfigLoader::load($projectRoot, 'registration'));

if (isset($_SESSION['desktop_auth']) && is_array($_SESSION['desktop_auth'])) {
    $currentAuthUser = is_array($_SESSION['desktop_auth']['user'] ?? null) ? $_SESSION['desktop_auth']['user'] : [];
    $accountCheck = $accountGate->checkUsername((string) ($currentAuthUser['username'] ?? ''));

    if (!($accountCheck['allowed'] ?? false)) {
        unset($_SESSION['desktop_auth']);
        header('Location: /auth/inactive/?message=' . urlencode((string) ($accountCheck['message'] ?? 'Dieses Konto ist noch nicht freigeschaltet.')), true, 302);
        exit;
    }
}

$currentUser = is_array($_SESSION['desktop_auth']['user'] ?? null) ? $_SESSION['desktop_auth']['user'] : [];
$currentGroups = array_map(static fn (string $group): string => strtolower(trim($group, '/')), array_values(array_map('strval', (array) ($currentUser['groups'] ?? []))));

if (!in_array('administrators', $currentGroups, true)) {
    http_response_code(403);
    echo 'Kein Zugriff auf User Management.';
    exit;
}

$csrfToken = (string) ($_SESSION['user_management_token'] ?? '');

if ($csrfToken === '') {
    $csrfToken = bin2hex(random_bytes(16));
    $_SESSION['user_management_token'] = $csrfToken;
}

$messages = [];
$errors = [];
$selectedId = trim((string) ($_GET['id'] ?? $_POST['selected_id'] ?? ''));
$manualUsername = trim((string) ($_POST['manual_username'] ?? ''));
$manualResetUsername = trim((string) ($_POST['reset_username'] ?? ''));
$manualResetPassword = (string) ($_POST['reset_password'] ?? '');

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $postedToken = (string) ($_POST['csrf_token'] ?? '');

    if ($postedToken === '' || !hash_equals($csrfToken, $postedToken)) {
        $errors[] = 'Die Formularprüfung ist fehlgeschlagen.';
    } else {
        $action = (string) ($_POST['action'] ?? '');

        if ($action === 'approve-registration') {
            $groupDns = array_values(array_filter(array_map('strval', (array) ($_POST['group_dns'] ?? []))));
            $memberOfList = implode(PHP_EOL, $groupDns);
            $result = $registration->approve($selectedId, [
                'member_of_list' => $memberOfList,
                'admin_note' => (string) ($_POST['admin_note'] ?? ''),
            ], (string) ($currentUser['username'] ?? 'administrator'));

            if (($result['success'] ?? false) !== true) {
                $errors = array_merge($errors, array_values(array_map('strval', (array) ($result['errors'] ?? []))));
            } else {
                $messages[] = 'Registrierung wurde freigeschaltet.';
            }
        } elseif ($action === 'deactivate-user') {
            $result = $registration->deactivateUser($manualUsername);
            ($result['success'] ?? false) ? $messages[] = (string) ($result['message'] ?? '') : $errors[] = (string) ($result['message'] ?? '');
        } elseif ($action === 'activate-user') {
            $groupDns = array_values(array_filter(array_map('strval', (array) ($_POST['manual_group_dns'] ?? []))));
            $result = $registration->activateExistingUser($manualUsername, $groupDns);
            ($result['success'] ?? false) ? $messages[] = (string) ($result['message'] ?? '') : $errors[] = (string) ($result['message'] ?? '');
        } elseif ($action === 'send-reset-mail') {
            $origin = ((isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off') ? 'https' : 'http') . '://' . ($_SERVER['HTTP_HOST'] ?? 'localhost');
            $result = $registration->sendPasswordReset($manualResetUsername, $origin);
            ($result['success'] ?? false) ? $messages[] = (string) ($result['message'] ?? '') : $errors[] = (string) ($result['message'] ?? '');
        } elseif ($action === 'set-password') {
            if (strlen($manualResetPassword) < 12) {
                $errors[] = 'Das neue Passwort muss mindestens 12 Zeichen lang sein.';
            } else {
                $result = $registration->setUserPassword($manualResetUsername, $manualResetPassword);
                ($result['success'] ?? false) ? $messages[] = (string) ($result['message'] ?? '') : $errors[] = (string) ($result['message'] ?? '');
            }
        }
    }
}

$pendingRequests = $registration->pendingApprovals();
$availableGroups = $registration->availableGroups();
$selected = $selectedId !== ''
    ? $registration->find($selectedId)
    : ($pendingRequests[0] ?? null);
?><!DOCTYPE html>
<html lang="de">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>User Management</title>
    <link rel="stylesheet" href="/assets/auth/login.css">
</head>
<body>
    <main class="login-shell">
        <section class="login-panel login-panel-admin">
            <div class="login-panel-top">
                <p class="login-kicker">Kusche.Berlin</p>
                <h1>User Management</h1>
                <p class="login-copy">Nur für Benutzer in der Gruppe <strong>administrators</strong>. Hier werden Neuregistrierungen freigeschaltet sowie bestehende LDAP-Benutzer aktiviert, deaktiviert oder zurückgesetzt.</p>
            </div>

            <?php if ($messages !== []): ?>
                <div class="login-notice login-notice-success">
                    <strong>Ergebnis</strong>
                    <ul class="login-list">
                        <?php foreach ($messages as $message): ?>
                            <li><?= htmlspecialchars($message, ENT_QUOTES) ?></li>
                        <?php endforeach; ?>
                    </ul>
                </div>
            <?php endif; ?>

            <?php if ($errors !== []): ?>
                <div class="login-notice login-notice-error">
                    <strong>Bitte prüfen</strong>
                    <ul class="login-list">
                        <?php foreach ($errors as $error): ?>
                            <li><?= htmlspecialchars($error, ENT_QUOTES) ?></li>
                        <?php endforeach; ?>
                    </ul>
                </div>
            <?php endif; ?>

            <div class="admin-layout">
                <aside class="admin-sidebar">
                    <h2>Offene Registrierungen</h2>
                    <div class="admin-request-list">
                        <?php foreach ($pendingRequests as $request): ?>
                            <a class="admin-request-card<?= (($selected['id'] ?? '') === ($request['id'] ?? '')) ? ' is-active' : '' ?>" href="/admin/users/?id=<?= urlencode((string) ($request['id'] ?? '')) ?>">
                                <strong><?= htmlspecialchars((string) ($request['username'] ?? ''), ENT_QUOTES) ?></strong>
                                <span><?= htmlspecialchars((string) ($request['email'] ?? ''), ENT_QUOTES) ?></span>
                                <span class="admin-status"><?= htmlspecialchars((string) ($request['status'] ?? ''), ENT_QUOTES) ?></span>
                            </a>
                        <?php endforeach; ?>
                    </div>
                </aside>

                <section class="admin-detail">
                    <?php if (is_array($selected)): ?>
                        <div class="admin-summary">
                            <h2>Freischaltung</h2>
                            <p>Benutzer: <?= htmlspecialchars((string) ($selected['username'] ?? ''), ENT_QUOTES) ?></p>
                            <p>E-Mail: <?= htmlspecialchars((string) ($selected['email'] ?? ''), ENT_QUOTES) ?></p>
                            <p>Status: <?= htmlspecialchars((string) ($selected['status'] ?? ''), ENT_QUOTES) ?></p>
                        </div>

                        <form class="login-form" method="post" action="/admin/users/">
                            <input type="hidden" name="csrf_token" value="<?= htmlspecialchars($csrfToken, ENT_QUOTES) ?>">
                            <input type="hidden" name="selected_id" value="<?= htmlspecialchars((string) ($selected['id'] ?? ''), ENT_QUOTES) ?>">
                            <input type="hidden" name="action" value="approve-registration">

                            <label class="login-field">
                                <span>Zielgruppen für Freischaltung</span>
                                <div class="admin-request-list">
                                    <?php foreach ($availableGroups as $group): ?>
                                        <label class="login-field">
                                            <span>
                                                <input type="checkbox" name="group_dns[]" value="<?= htmlspecialchars($group['dn'], ENT_QUOTES) ?>">
                                                <?= htmlspecialchars($group['label'], ENT_QUOTES) ?>
                                            </span>
                                        </label>
                                    <?php endforeach; ?>
                                </div>
                            </label>

                            <label class="login-field">
                                <span>Admin-Notiz</span>
                                <textarea name="admin_note" rows="3"></textarea>
                            </label>

                            <div class="login-actions">
                                <button class="login-button login-button-primary" type="submit">Freischaltung bestätigen</button>
                            </div>
                        </form>
                    <?php endif; ?>

                    <div class="admin-summary">
                        <h2>Bestehenden Benutzer verwalten</h2>
                    </div>

                    <form class="login-form" method="post" action="/admin/users/">
                        <input type="hidden" name="csrf_token" value="<?= htmlspecialchars($csrfToken, ENT_QUOTES) ?>">
                        <label class="login-field">
                            <span>Benutzername</span>
                            <input type="text" name="manual_username" value="<?= htmlspecialchars($manualUsername, ENT_QUOTES) ?>" required>
                        </label>

                        <label class="login-field">
                            <span>Gruppen für Aktivierung</span>
                            <div class="admin-request-list">
                                <?php foreach ($availableGroups as $group): ?>
                                    <label class="login-field">
                                        <span>
                                            <input type="checkbox" name="manual_group_dns[]" value="<?= htmlspecialchars($group['dn'], ENT_QUOTES) ?>">
                                            <?= htmlspecialchars($group['label'], ENT_QUOTES) ?>
                                        </span>
                                    </label>
                                <?php endforeach; ?>
                            </div>
                        </label>

                        <div class="login-actions">
                            <button class="login-button login-button-primary" type="submit" name="action" value="activate-user">Benutzer aktivieren</button>
                            <button class="login-button login-button-danger" type="submit" name="action" value="deactivate-user">Benutzer deaktivieren</button>
                        </div>
                    </form>

                    <div class="admin-summary">
                        <h2>Passwort zurücksetzen</h2>
                    </div>

                    <form class="login-form" method="post" action="/admin/users/">
                        <input type="hidden" name="csrf_token" value="<?= htmlspecialchars($csrfToken, ENT_QUOTES) ?>">
                        <label class="login-field">
                            <span>Benutzername</span>
                            <input type="text" name="reset_username" value="<?= htmlspecialchars($manualResetUsername, ENT_QUOTES) ?>" required>
                        </label>

                        <label class="login-field">
                            <span>Neues Passwort für direkten Reset</span>
                            <input type="password" name="reset_password" value="" placeholder="Optional für direkten Admin-Reset">
                        </label>

                        <div class="login-actions">
                            <button class="login-button login-button-secondary" type="submit" name="action" value="send-reset-mail">Reset-Mail senden</button>
                            <button class="login-button login-button-primary" type="submit" name="action" value="set-password">Passwort direkt setzen</button>
                        </div>
                    </form>
                </section>
            </div>
        </section>
    </main>
</body>
</html>