<?php

declare(strict_types=1);

namespace Esun\MultiLocaleTranslation\Model\Queue;

use Magento\Backend\Model\Session;

class SelectionRegistry
{
    private const SESSION_PREFIX = 'esun_mlt_queue_selection_';

    public function __construct(private readonly Session $session)
    {
    }

    /** @param int[] $entityIds */
    public function save(string $entityType, array $entityIds): string
    {
        $token = bin2hex(random_bytes(16));
        $this->session->setData(self::SESSION_PREFIX . $token, [
            'entity_type' => $entityType,
            'entity_ids' => array_values(array_unique(array_map('intval', $entityIds))),
        ]);
        return $token;
    }

    /** @return array{entity_type:string,entity_ids:int[]}|null */
    public function get(string $token): ?array
    {
        if (preg_match('/^[a-f0-9]{32}$/', $token) !== 1) {
            return null;
        }
        $selection = $this->session->getData(self::SESSION_PREFIX . $token);
        return is_array($selection) ? $selection : null;
    }

    public function clear(string $token): void
    {
        if (preg_match('/^[a-f0-9]{32}$/', $token) === 1) {
            $this->session->unsetData(self::SESSION_PREFIX . $token);
        }
    }
}