<?php
declare(strict_types=1);


namespace OneClickFormSync\Security;

if (!defined('ABSPATH')) {
    exit;
}

use OneClickFormSync\Contracts\LockInterface;

/**
 * Atomic lock implementation using WordPress options API.
 */
class WordPressLock implements LockInterface
{
    /**
     * Prefix for lock option names.
     */
    private const LOCK_OPTION_PREFIX = 'oneclickformsync_lock_';

    /**
     * @inheritDoc
     */
    public function acquire(string $key, int $ttlSeconds = 30): bool
    {
        $optionName = self::LOCK_OPTION_PREFIX . $key;
        $expiresAt = time() + $ttlSeconds;

        // add_option is atomic in WordPress database driver;
        // returns false if option already exists.
        $result = add_option($optionName, $expiresAt, '', 'no');
        if ($result) {
            return true;
        }

        // Lock exists. Check if it has expired (self-healing for orphaned locks).
        $existingExpiresAt = get_option($optionName);
        if ($existingExpiresAt !== false && time() > (int)$existingExpiresAt) {
            $this->release($key);
            return add_option($optionName, $expiresAt, '', 'no');
        }

        return false;
    }

    /**
     * @inheritDoc
     */
    public function release(string $key): void
    {
        $optionName = self::LOCK_OPTION_PREFIX . $key;
        delete_option($optionName);
    }
}