<?php

declare(strict_types=1);

namespace Sarcio\WordPress\Cache;

use Sarcio\Shim\Transport\PatchCache;

/**
 * The pull transport's verified patches, kept in one non-autoloaded option so
 * every PHP-FPM worker and every WP-Cron run shares the same set and a pull
 * happens once per refresh window, not once per request. With a persistent
 * object cache installed the option read is a memory hit; without one it is
 * a single indexed query, which is still far cheaper than an HTTPS pull.
 */
final class OptionPatchCache implements PatchCache
{
    public const OPTION = 'sarcio_pull_state';

    /** @param string $siteKey the state is kept per site key, so a changed key never reads the old site's set */
    public function __construct(private readonly string $siteKey)
    {
    }

    public function get(): ?array
    {
        $all = get_option(self::OPTION, []);
        $value = is_array($all) ? ($all[$this->siteKey] ?? null) : null;
        return is_array($value) ? $value : null;
    }

    public function set(array $state): void
    {
        update_option(self::OPTION, [$this->siteKey => $state], false);
    }

    public function forget(): void
    {
        delete_option(self::OPTION);
    }
}