<?php
/**
 * @since      0.1
 *
 * @package    pdf-viewer-block
 * @subpackage pdf-viewer-block/admin
 */

/**
 * The admin-specific functionality of the plugin.
 *
 * @package    pdf-viewer-block
 * @subpackage pdf-viewer-block/admin
 * @author     audrasjb <[email protected]>
 */

/**
 *
 * Enqueue styles and scripts
 *
 */
    if ( ! function_exists( 'register_block_type' ) ) {
        // Gutenberg is not active.
        return;
    }

    add_action( 'admin_enqueue_scripts', 'gpvb_enqueue_styles_admin' );
    function gpvb_enqueue_styles_admin() {
        if ( ! gpvb_is_block_editor() ) {
            return;
        }

        wp_enqueue_style(
            'gpvb-admin-styles',
            plugin_dir_url( __FILE__ ) . 'css/admin.css',
            array(),
            '',
            'all'
        );
        wp_register_script(
            'gpvb-admin-scripts',
            plugins_url( 'js/block.js', __FILE__ ),
            array( 'wp-blocks', 'wp-components', 'wp-element', 'wp-i18n', 'wp-editor' ),
            filemtime( plugin_dir_path( __FILE__ ) . 'js/block.js' ),
            true
        );
        wp_enqueue_script( 'gpvb-admin-scripts' );
    }
    register_block_type( 'pdf-viewer-block/standard',
        array(
            'editor_script' => 'gpvb-admin-scripts',
            'editor_style'  => 'gpvb-admin-styles',
        )
    );

function gpvb_is_block_editor() {
    // Check WordPress version.
    if ( version_compare( get_bloginfo( 'version' ), '5.0.0', '<' ) ) {
        return false;
    }

    $screen = function_exists( 'get_current_screen' ) ? get_current_screen() : false;

    if ( ! $screen instanceof WP_Screen ) {
        return false;
    }

    if ( method_exists( $screen, 'is_block_editor' ) ) {
        return $screen->is_block_editor();
    }

    if ( 'post' === $screen->base ) {
        return gpvb_use_block_editor_for_post_type( $screen->post_type );
    }

    return false;
}

function gpvb_use_block_editor_for_post_type() {
    if ( ! post_type_exists( $post_type ) ) {
        return false;
    }

    if ( ! post_type_supports( $post_type, 'editor' ) ) {
        return false;
    }

    $post_type_object = get_post_type_object( $post_type );
    if ( $post_type_object && ! $post_type_object->show_in_rest ) {
        return false;
    }

    /**
     * Filter whether a post is able to be edited in the block editor.
     *
     * @since 5.0.0
     *
     * @param bool   $use_block_editor  Whether the post type can be edited or not. Default true.
     * @param string $post_type         The post type being checked.
     */
    return apply_filters( 'use_block_editor_for_post_type', true, $post_type );
}