<?php

namespace App\Services;

use Illuminate\Support\Facades\Crypt;

class PairingTokenService
{
    public function issue(int $registrationId): string
    {
        $ttl = config('pxg.pairing_token_ttl_minutes', 30);
        $payload = [
            'rid' => $registrationId,
            'exp' => now()->addMinutes($ttl)->timestamp,
        ];
        return Crypt::encryptString(json_encode($payload));
    }

    public function verify(string $token): ?int
    {
        try {
            $json = Crypt::decryptString($token);
            $payload = json_decode($json, true);
            if (!is_array($payload)) return null;
            if (($payload['exp'] ?? 0) < time()) return null;
            $rid = (int) ($payload['rid'] ?? 0);
            return $rid > 0 ? $rid : null;
        } catch (\Throwable $e) {
            return null;
        }
    }
}