<?php
declare(strict_types=1);
/** POLANA V18.14: transforms only verified known source fragments. No side effects on include. */
function pv1814_transform_reservations(string $source): string {
    if (substr_count($source, 'function reservation_change_status(') !== 1) {
        throw new RuntimeException('Nie rozpoznano jednoznacznie funkcji zmiany statusu.');
    }
    if (!preg_match('/function reservation_change_status\(.*?\n\}/s', $source, $m, PREG_OFFSET_CAPTURE)) {
        throw new RuntimeException('Nie mozna bezpiecznie wyznaczyc konca funkcji zmiany statusu.');
    }
    $body = $m[0][0]; $offset = (int)$m[0][1];
    if (str_contains($body, 'POLANA_V1814_GCAL_AFTER_STATUS') || str_contains($body, 'pg173_after_change(')) return $source;
    $needle = "    return \$reservation;\n}";
    if (substr_count($body, $needle) !== 1) throw new RuntimeException('Nieznany koniec funkcji zmiany statusu.');
    $hook = <<<'HOOK'
    /* POLANA_V1814_GCAL_AFTER_STATUS: po zapisaniu nowego statusu, bez duplikatow. */
    if ((string)$previous['status'] !== $status) {
        try {
            require_once __DIR__ . '/polana_gcal.php';
            pg173_after_change($id, $adminUserId);
        } catch (Throwable $calendarError) {
            error_log('[POLANA GCAL AUTO V18.14] #'.$id.': '.$calendarError->getMessage());
            try {
                reservation_add_event($id, 'calendar_error', 'Automatyczna synchronizacja Kalendarza: '.mb_substr($calendarError->getMessage(), 0, 240, 'UTF-8'), $adminUserId);
            } catch (Throwable $ignored) {}
        }
    }

HOOK;
    $changed = str_replace($needle, $hook.$needle, $body);
    return substr_replace($source, $changed, $offset, strlen($body));
}
function pv1814_transform_nav(string $source): string {
    $marker = '<!-- POLANA_V1814_MODULY_NAV -->';
    if (str_contains($source, $marker)) return $source;
    $needle = '<a href="/admin/polana-zarzadzanie.php">Zarządzanie</a>';
    if (substr_count($source, $needle) !== 1) throw new RuntimeException('Nie znaleziono jednego bezpiecznego miejsca w menu administratora.');
    $added = <<<'ADD'
<!-- POLANA_V1814_MODULY_NAV -->
            <?php if ($role === 'admin'): ?><a href="/admin/polana-v1814-moduly.php">Wszystkie moduły</a><?php endif; ?>
ADD;
    return str_replace($needle, $needle."\n            ".$added, $source);
}