<?php
/**
 * Remove dns prefetch.
 *
 * @package OvanapAdminToolkit
 */

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

return array(
	'key'      => 'remove_dns_prefetch',
	'title'    => 'Remove emoji server DNS prefetch',
	'desc'     => 'Remove the dns-prefetch hint for the WordPress.org emoji server',
	'icon'     => 'rss',
	'help'     => 'Older WordPress versions added a dns-prefetch hint for the WordPress.org server that hosts emoji images. WordPress 7.1 no longer adds it, so on an up-to-date site this feature usually changes nothing. It removes any dns-prefetch hint for that server that goes through WordPress\'s resource hints, whoever added it.',
	'before'   => 'A dns-prefetch link to the WordPress.org emoji server in the page head (older WordPress versions)',
	'after'    => 'Hint removed.',
	'benefit'  => 'A dns-prefetch hint only asks the browser to look up an address early; it does not download anything. Removing it saves at most one DNS lookup, and only matters if emoji images are never loaded from that server.',
	'level'    => 'beginner',
	'audience' => 'everyone',
	'priority' => 4,
	'detect'   => function () {
		return array(
			'detected' => true,
			'message'  => 'DNS prefetch hint for the WordPress.org emoji CDN in the page header',
			'safe'     => true,
			'savings'  => '1 DNS lookup',
		);
	},
	'callback' => function () {
		add_filter(
			'wp_resource_hints',
			function ( $urls, $type ) {
				if ( 'dns-prefetch' === $type ) {
					$urls = array_filter(
						$urls,
						function ( $url ) {
							return strpos( $url, 's.w.org' ) === false; // phpcs:ignore PluginCheck.CodeAnalysis.Offloading.OffloadedContent -- Matches core's emoji CDN hint in order to remove it; nothing is loaded.
						}
					);
				}
				return $urls;
			},
			10,
			2
		);
	},
);