// Add preconnect links.
/*
 * The following embeds have been chosen for optimization due to their relative popularity among all embed types.
 * See <https://colab.sandbox.google.com/drive/1nSpg3qoCLY-cBTV2zOUkgUCU7R7X2f_R?resourcekey=0-MgT7Ur0pT__vw-5_AHjgWQ#scrollTo=utZv59sXzXvS>.
 * The list of hosts being preconnected to was obtained by inserting an embed into a post and then looking
 * at the network log on the frontend as the embed renders. Each should include the host of the iframe src
 * as well as URLs for assets used by the embed, _if_ the URL looks like it is not geotargeted (e.g. '-us')
 * or load-balanced (e.g. 's0.example.com'). For the load balancing case, attempt to load the asset by
 * incrementing the number appearing in the subdomain (e.g. s1.example.com). If the asset still loads, then
 * it is a likely case of a load balancing domain name which cannot be safely preconnected since it could
 * not end up being the load balanced domain used for the embed. Lastly, these domains are only for the URLs
 * for GET requests, as POST requests are not likely to be part of the critical rendering path.
 */
$preconnect_hrefs = array();
$has_class        = static function ( string $wanted_class ) use ( $processor ): bool {
	return true === $processor->has_class( $wanted_class );
};
if ( $has_class( 'wp-block-embed-youtube' ) ) {
	$preconnect_hrefs[] = 'https://www.youtube.com';
	$preconnect_hrefs[] = 'https://i.ytimg.com';
} elseif ( $has_class( 'wp-block-embed-twitter' ) ) {
	$preconnect_hrefs[] = 'https://syndication.twitter.com';
	$preconnect_hrefs[] = 'https://pbs.twimg.com';
} elseif ( $has_class( 'wp-block-embed-vimeo' ) ) {
	$preconnect_hrefs[] = 'https://player.vimeo.com';
	$preconnect_hrefs[] = 'https://f.vimeocdn.com';
	$preconnect_hrefs[] = 'https://i.vimeocdn.com';
} elseif ( $has_class( 'wp-block-embed-spotify' ) ) {
	$preconnect_hrefs[] = 'https://apresolve.spotify.com';
	$preconnect_hrefs[] = 'https://embed-cdn.spotifycdn.com';
	$preconnect_hrefs[] = 'https://encore.scdn.co';
	$preconnect_hrefs[] = 'https://i.scdn.co';
} elseif ( $has_class( 'wp-block-embed-videopress' ) || $has_class( 'wp-block-embed-wordpress-tv' ) ) {
	$preconnect_hrefs[] = 'https://video.wordpress.com';
	$preconnect_hrefs[] = 'https://public-api.wordpress.com';
	$preconnect_hrefs[] = 'https://videos.files.wordpress.com';
	$preconnect_hrefs[] = 'https://v0.wordpress.com'; // This does not appear to be a load-balanced domain since v1.wordpress.com is not valid.
} elseif ( $has_class( 'wp-block-embed-instagram' ) ) {
	$preconnect_hrefs[] = 'https://www.instagram.com';
	$preconnect_hrefs[] = 'https://static.cdninstagram.com';
	$preconnect_hrefs[] = 'https://scontent.cdninstagram.com';
} elseif ( $has_class( 'wp-block-embed-tiktok' ) ) {
	$preconnect_hrefs[] = 'https://www.tiktok.com';
	// Note: The other domains used for TikTok embeds include https://lf16-tiktok-web.tiktokcdn-us.com,
	// https://lf16-cdn-tos.tiktokcdn-us.com, and https://lf16-tiktok-common.tiktokcdn-us.com among others
	// which either appear to be geo-targeted ('-us') _or_ load-balanced ('lf16'). So these are not added
	// to the preconnected hosts.
} elseif ( $has_class( 'wp-block-embed-amazon' ) ) {
	$preconnect_hrefs[] = 'https://read.amazon.com';
	$preconnect_hrefs[] = 'https://m.media-amazon.com';
} elseif ( $has_class( 'wp-block-embed-soundcloud' ) ) {
	$preconnect_hrefs[] = 'https://w.soundcloud.com';
	$preconnect_hrefs[] = 'https://widget.sndcdn.com';
	// Note: There is also https://i1.sndcdn.com which is for the album art, but the '1' indicates it may be geotargeted/load-balanced.
} elseif ( $has_class( 'wp-block-embed-pinterest' ) ) {
	$preconnect_hrefs[] = 'https://assets.pinterest.com';
	$preconnect_hrefs[] = 'https://widgets.pinterest.com';
	$preconnect_hrefs[] = 'https://i.pinimg.com';
}

foreach ( $preconnect_hrefs as $preconnect_href ) {
	foreach ( $context->url_metric_group_collection as $group ) {
		if ( ! ( $group->get_element_max_intersection_ratio( $embed_wrapper_xpath ) > 0.0 ) ) {
			continue;
		}

		$context->link_collection->add_link(
			array(
				'rel'  => 'preconnect',
				'href' => $preconnect_href,
			),
			$group->get_minimum_viewport_width(),
			$group->get_maximum_viewport_width()
		);
	}
}

// Lazy-loading can only be done once there are URL Metrics collected for both mobile and desktop.
if (
	$context->url_metric_group_collection->get_first_group()->count() > 0
	&&
	$context->url_metric_group_collection->get_last_group()->count() > 0
) {
	$max_intersection_ratio = $context->url_metric_group_collection->get_element_max_intersection_ratio( $embed_wrapper_xpath );
	if ( ! ( $max_intersection_ratio > 0 ) && embed_optimizer_update_markup( $processor, false ) && ! $this->added_lazy_script ) {
		$processor->append_body_html( wp_get_inline_script_tag( embed_optimizer_get_lazy_load_script(), array( 'type' => 'module' ) ) );
		$this->added_lazy_script = true;
	}
}