<?php


class OnecomExcludeCache
{


    public function __construct()
    {
        add_action( 'init', array($this,'oc_vcache_register_post_meta' ));
        add_action('add_meta_boxes', array($this, 'exclude_from_cache'), 10, 2);
        add_action('save_post', array($this, 'oct_save_exclude_cache'), 10, 2);
        add_action('enqueue_block_editor_assets', array($this, 'oc_block_script_enqueue'));
    }


    /**
     * adds a metabox for the posts & pages to be excluded from cache
     */
    public function exclude_from_cache()
    {
        add_meta_box(
            'exclude-vcache',
            esc_html__('Exclude from Performance cache', 'vcaching'),
            [$this, 'exclude_from_cache_metabox'],
            ['post','page'],
            'side',
            'default',
            array(
                '__block_editor_compatible_meta_box' => true,
                '__back_compat_meta_box' => true,
            )

        );

    }

    /**
     * @param $post
     * callback function for backword compatibility / classic editor plugin installed.
     */
    public function exclude_from_cache_metabox($post)
    {
        wp_nonce_field(basename(__FILE__), 'oct-exclude-from-cache');
        $excluded_from_cache = get_post_meta($post->ID, '_oct_exclude_from_cache', true);
        ?>
        <p>
            <label for="oc-exclude-from-cache">
                <input type="checkbox" name="oc-exclude-from-cache" id="oc-exclude-cache"
                       value="<?php echo $excluded_from_cache ?>>" <?php if (isset ($excluded_from_cache)) {
                    checked($excluded_from_cache, true);
                } ?> />
                <?php _e('Exclude', 'vcaching') ?>
            </label>
        </p><?php
    }


    /**
     * @param $post_id
     * @return mixed
     * saves the metabox value.
     * function for backword compatibility / classic editor plugin installed.
     */
    function oct_save_exclude_cache($post_id,$post)
    {
// replace url to be purged with a better approach
        $response = wp_remote_request(get_site_url().'?p='.$post_id, ['method' => 'PURGE']);

        if (!isset($_POST['oct-exclude-from-cache']) || !wp_verify_nonce($_POST['oct-exclude-from-cache'], basename(__FILE__))) {
            return $post_id;
        }


        if (isset($_POST['oc-exclude-from-cache'])) {
            update_post_meta($post_id, '_oct_exclude_from_cache', true);
        } else {
            update_post_meta($post_id, '_oct_exclude_from_cache', false);
        }

    }

    /**
     *
     */
    public function oc_block_script_enqueue()
    {
        global $pagenow;
        if ( $pagenow !== 'post.php' ) {
            return;
        }
        wp_enqueue_script(
            'block-metabox',
            plugins_url('../assets/js/blocks/block-metabox.js', __FILE__),
            array('wp-edit-post')
        );

        wp_localize_script(
                'block-metabox',
                'blockObject',
            array(
                    'label'  => 'Exclude from cache',
                'excludeText' => 'This %s will be excluded from cache.',
                'includeText' => 'This %s will be cached.',

            )
        );
    }

    /**
     * registers post meta for exclude cache
     */
    public function oc_vcache_register_post_meta()
    {
        if (function_exists('register_post_meta')) {
            register_post_meta('', '_oct_exclude_from_cache', array(
                'show_in_rest' => true,
                'single' => true,
                'type' => 'boolean',
                'auth_callback' => function () {
                    return current_user_can('edit_posts');
                }
            ));
        } else {
            $this->oc_register_post_meta('', '_oct_exclude_from_cache', array(
                'show_in_rest' => true,
                'single' => true,
                'type' => 'boolean',
                'auth_callback' => function () {
                    return current_user_can('edit_posts');
                }
            ));


        }
    }

    /**
     * @param $post_type
     * @param $meta_key
     * @param array $args
     * @return bool
     * For backward compatibility with versions older than WP 4.9
     */
    public function oc_register_post_meta($post_type, $meta_key, array $args)
    {
        $args['object_subtype'] = $post_type;

        return register_meta('post', $meta_key, $args);
    }

}