<?php

declare(strict_types=1);

namespace WordPress\CloudflareWorkersAiProvider;

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

/**
 * MySQL named locks. They belong to the DB connection, so a PHP process that
 * dies mid-run releases its lock and nothing is left stale. On a database
 * without GET_LOCK (e.g. SQLite) acquire() succeeds unguarded.
 */
final class Lock
{
    public static function acquire(string $name, int $timeout = 0): bool
    {
        global $wpdb;
        $got = $wpdb->get_var($wpdb->prepare('SELECT GET_LOCK(%s, %d)', self::key($name), $timeout)); // phpcs:ignore WordPress.DB.DirectDatabaseQuery
        return $got === null || (string) $got === '1';
    }

    public static function release(string $name): void
    {
        global $wpdb;
        $wpdb->query($wpdb->prepare('SELECT RELEASE_LOCK(%s)', self::key($name))); // phpcs:ignore WordPress.DB.DirectDatabaseQuery
    }

    private static function key(string $name): string
    {
        global $wpdb;
        // Named locks are server-wide; scope them to this site's tables.
        return substr('aipcf_' . $wpdb->prefix . $name, 0, 64);
    }
}