dsifford/academic-bloggers-toolkit

<?php
/**
 * Editor functionality.
 *
 * @package ABT
 */

declare(strict_types=1);

namespace ABT\Editor;

defined( 'ABSPATH' ) || exit;

use function ABT\Utils\add_json_script;

/**
 * Enqueue admin scripts.
 */
function enqueue_scripts() {
    global $post;
    wp_enqueue_style( 'abt-editor' );
    wp_enqueue_script( 'abt-editor' );

    $state = init_editor_state( $post->ID );
    add_json_script( 'abt-editor-state', $state );
}
add_action( 'enqueue_block_editor_assets', __NAMESPACE__ . '\enqueue_scripts' );

/**
 * Register post meta to store editor state.
 */
function register_metadata() {
    register_meta(
        'post',
        '_abt_state',
        [
            'show_in_rest'  => true,
            'single'        => true,
            'type'          => 'string',
            'auth_callback' => function() {
                return current_user_can( 'edit_posts' );
            },
        ]
    );
}
add_action( 'init', __NAMESPACE__ . '\register_metadata' );

/**
 * Prepares editor state and returns the value.
 *
 * If editor state doesn't exist, this function initializes a new blank state
 * and converts any existing old legacy editor state to the current format.
 *
 * If state exists, decode it from json and return the value.
 *
 * @param int $post_id The post id.
 * @return mixed The editor state.
 */
function init_editor_state( int $post_id ) {
    $meta = get_post_meta( $post_id );

    if ( ! array_key_exists( '_abt_state', $meta ) || ! has_blocks( $post_id ) ) {
        $state = (object) [
            'references' => [],
            'style'      => get_option( ABT_OPTIONS_KEY )['citation_style'],
        ];

        if ( array_key_exists( '_abt-reflist-state', $meta ) ) {
            $legacy_meta = json_decode( $meta['_abt-reflist-state'][0] );
            foreach ( $legacy_meta->CSL as $id => $data ) { // phpcs:ignore
                $state->references[] = $data;
            }
            $state->style = $legacy_meta->cache->style;
        }

        add_post_meta(
            $post_id,
            '_abt_state',
            wp_slash( wp_json_encode( $state ) ),
            true
        );
    } else {
        $state = json_decode( $meta['_abt_state'][0] );
    }

    return $state;
}