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1<?php
2/**
3 * Adds support for Jetpack Subscription Site feature.
4 *
5 * @package automattic/jetpack
6 * @since 13.3
7 */
8
9namespace Automattic\Jetpack\Extensions\Subscriber_Login;
10
11use WP_Block_Template;
12use WP_Post;
13
14/**
15 * Jetpack_Subscription_Site class.
16 */
17class Jetpack_Subscription_Site {
18    /**
19     * Jetpack_Subscription_Site singleton instance.
20     *
21     * @var Jetpack_Subscription_Site|null
22     */
23    private static $instance;
24
25    /**
26     * Jetpack_Subscription_Site instance init.
27     */
28    public static function init() {
29        if ( self::$instance === null ) {
30            self::$instance = new Jetpack_Subscription_Site();
31        }
32
33        return self::$instance;
34    }
35
36    /**
37     * Handles Subscriber Login block placements.
38     *
39     * @return void
40     */
41    public function handle_subscriber_login_block_placements() {
42        $this->handle_subscriber_login_block_navigation_placement();
43    }
44
45    /**
46     * Returns true if context is recognized as a header element.
47     *
48     * @param WP_Block_Template|WP_Post|array $context The block template, template part, or pattern the anchor block belongs to.
49     *
50     * @return bool
51     */
52    protected function is_header_context( $context ) {
53        if ( $context instanceof WP_Post && $context->post_type === 'wp_navigation' ) {
54            return true;
55        }
56
57        if ( $context instanceof WP_Block_Template && $context->area === 'header' ) {
58            return true;
59        }
60
61        return false;
62    }
63
64    /**
65     * Handles Subscriber Login block navigation placement.
66     *
67     * @return void
68     */
69    protected function handle_subscriber_login_block_navigation_placement() {
70        $subscriber_login_navigation_enabled = get_option( 'jetpack_subscriptions_login_navigation_enabled', false );
71        if ( ! $subscriber_login_navigation_enabled ) {
72            return;
73        }
74
75        if ( ! wp_is_block_theme() ) { // TODO Fallback for classic themes.
76            return;
77        }
78
79        add_filter(
80            'hooked_block_types',
81            function ( $hooked_blocks, $relative_position, $anchor_block, $context ) {
82                if (
83                    $anchor_block === 'core/navigation' &&
84                    $relative_position === 'last_child' &&
85                    self::is_header_context( $context )
86                ) {
87                    $hooked_blocks[] = 'jetpack/subscriber-login';
88                }
89
90                return $hooked_blocks;
91            },
92            10,
93            4
94        );
95    }
96}