<?php

declare(strict_types=1);

namespace App\Libraries;

/**
 * Session-based PDF view access, granted after captcha.
 * One grant (2h) unlocks both the online viewer and the download flow for a book.
 */
class PdfAccess
{
    private const KEY = 'pdf_access';

    public static function grant(string $bookId, int $ttl = 7200): void
    {
        $map = session()->get(self::KEY) ?? [];
        // keep map bounded
        if (count($map) > 50) {
            $map = array_filter($map, fn($ts) => $ts > time());
        }
        $map[$bookId] = time() + $ttl;
        session()->set(self::KEY, $map);
    }

    public static function has(string $bookId): bool
    {
        $map = session()->get(self::KEY) ?? [];
        return isset($map[$bookId]) && $map[$bookId] > time();
    }
}