<?php

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namespace Automattic\WooCommerce\Blocks\Domain\Services;

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use Automattic\WooCommerce\Blocks\Package;

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use Automattic\WooCommerce\Blocks\Assets\Api as AssetApi;

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/**

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* Service class to integrate Blocks with the Google Analytics extension,

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*/

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class GoogleAnalytics {

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/**

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* Instance of the asset API.

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*

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* @var AssetApi

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*/

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protected $asset_api;

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/**

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* Constructor.

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*

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* @param AssetApi $asset_api Instance of the asset API.

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*/

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public function __construct( AssetApi $asset_api ) {

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$this->asset_api = $asset_api;

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}

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/**

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* Hook into WP.

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*/

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public function init() {

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// Require Google Analytics Integration to be activated.

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if ( ! class_exists( 'WC_Google_Analytics_Integration', false ) ) {

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return;

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}

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add_action( 'init', array( $this, 'register_assets' ) );

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add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_scripts' ) );

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add_filter( 'script_loader_tag', array( $this, 'async_script_loader_tags' ), 10, 3 );

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}

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/**

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* Register scripts.

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*/

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public function register_assets() {

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$this->asset_api->register_script( 'wc-blocks-google-analytics', 'assets/client/blocks/wc-blocks-google-analytics.js', [ 'google-tag-manager' ] );

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}

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/**

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* Enqueue the Google Tag Manager script if prerequisites are met.

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*/

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public function enqueue_scripts() {

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$settings = $this->get_google_analytics_settings();

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$prefix = strstr( strtoupper( $settings['ga_id'] ), '-', true );

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// Require tracking to be enabled with a valid GA ID.

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if ( ! in_array( $prefix, [ 'G', 'GT' ], true ) ) {

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return;

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}

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/**

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* Filter to disable Google Analytics tracking.

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*

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* @internal Matches filter name in GA extension.

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* @since 4.9.0

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*

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* @param boolean $disable_tracking If true, tracking will be disabled.

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*/

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if ( apply_filters( 'woocommerce_ga_disable_tracking', ! wc_string_to_bool( $settings['ga_event_tracking_enabled'] ) ) ) {

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return;

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}

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if ( ! wp_script_is( 'google-tag-manager', 'registered' ) ) {

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// Using an array with strategies as the final argument to wp_register_script was introduced in WP 6.3.

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// WC requires at least 6.3 at the point of adding this, so it's safe to leave in without version checks.

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// phpcs:ignore WordPress.WP.EnqueuedResourceParameters.MissingVersion

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wp_register_script(

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'google-tag-manager',

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'https://www.googletagmanager.com/gtag/js?id=' . $settings['ga_id'],

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[],

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null,

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[

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'in_footer' => false,

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'strategy' => 'async',

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]

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);

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wp_add_inline_script(

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'google-tag-manager',

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"

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window.dataLayer = window.dataLayer || [];

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function gtag(){dataLayer.push(arguments);}

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gtag('js', new Date());

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gtag('config', '" . esc_js( $settings['ga_id'] ) . "', { 'send_page_view': false });"

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);

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}

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wp_enqueue_script( 'wc-blocks-google-analytics' );

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}

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/**

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* Get settings from the GA integration extension.

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*

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* @return array

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*/

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private function get_google_analytics_settings() {

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return wp_parse_args(

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get_option( 'woocommerce_google_analytics_settings' ),

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[

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'ga_id' => '',

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'ga_event_tracking_enabled' => 'no',

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]

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);

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}

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/**

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* Add async to script tags with defined handles.

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*

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* @param string $tag HTML for the script tag.

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* @param string $handle Handle of script.

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* @param string $src Src of script.

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* @return string

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*/

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public function async_script_loader_tags( $tag, $handle, $src ) {

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if ( ! in_array( $handle, array( 'google-tag-manager' ), true ) ) {

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return $tag;

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}

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// If script was output manually in wp_head, abort.

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if ( did_action( 'woocommerce_gtag_snippet' ) ) {

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return '';

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}

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return str_replace( '<script src', '<script async src', $tag );

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}

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}

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