<?php
/**
 * Used to set up all core blocks used with the block editor.
 *
 * @package WordPress
 */

// Don't load directly.
if ( ! defined( 'ABSPATH' ) ) {
    die( '-1' );
}

define( 'BLOCKS_PATH', ABSPATH . WPINC . '/blocks/' );

// Include files required for core blocks registration.
require BLOCKS_PATH . 'legacy-widget.php';
require BLOCKS_PATH . 'widget-group.php';
require BLOCKS_PATH . 'require-dynamic-blocks.php';

/**
 * Registers core block style handles.
 *
 * While {@see register_block_style_handle()} is typically used for that, the way it is
 * implemented is inefficient for core block styles. Registering those style handles here
 * avoids unnecessary logic and filesystem lookups in the other function.
 *
 * @since 6.3.0
 */
function register_core_block_style_handles() {
    $wp_version = wp_get_wp_version();

    if ( ! wp_should_load_separate_core_block_assets() ) {
        return;
    }

    $blocks_url   = includes_url( 'blocks/' );
    $suffix       = wp_scripts_get_suffix();
    $wp_styles    = wp_styles();
    $style_fields = array(
        'style'       => 'style',
        'editorStyle' => 'editor',
    );

    static $core_blocks_meta;
    if ( ! $core_blocks_meta ) {
        $core_blocks_meta = require BLOCKS_PATH . 'blocks-json.php';
    }

    $files          = false;
    $transient_name = 'wp_core_block_css_files';

    /*
     * Ignore transient cache when the development mode is set to 'core'. Why? To avoid interfering with
     * the core developer's workflow.
     */
    $can_use_cached = ! wp_is_development_mode( 'core' );

    if ( $can_use_cached ) {
        $cached_files = get_transient( $transient_name );

        // Check the validity of cached values by checking against the current WordPress version.
        if (
            is_array( $cached_files )
            && isset( $cached_files['version'] )
            && $cached_files['version'] === $wp_version
            && isset( $cached_files['files'] )
        ) {
            $files = $cached_files['files'];
        }
    }

    if ( ! $files ) {
        $files = glob( wp_normalize_path( BLOCKS_PATH . '**/**.css' ) );

        // Normalize BLOCKS_PATH prior to substitution for Windows environments.
        $normalized_blocks_path = wp_normalize_path( BLOCKS_PATH );

        $files = array_map(
            static function ( $file ) use ( $normalized_blocks_path ) {
                return str_replace( $normalized_blocks_path, '', $file );
            },
            $files
        );

        // Save core block style paths in cache when not in development mode.
        if ( $can_use_cached ) {
            set_transient(
                $transient_name,
                array(
                    'version' => $wp_version,
                    'files'   => $files,
                )
            );
        }
    }

    $register_style = static function ( $name, $filename, $style_handle ) use ( $blocks_url, $suffix, $wp_styles, $files ) {
        $style_path = "{$name}/{$filename}{$suffix}.css";
        $path       = wp_normalize_path( BLOCKS_PATH . $style_path );

        if ( ! in_array( $style_path, $files, true ) ) {
            $wp_styles->add(
                $style_handle,
                false
            );
            return;
        }

        $wp_styles->add( $style_handle, $blocks_url . $style_path );
        $wp_styles->add_data( $style_handle, 'path', $path );

        $rtl_file = "{$name}/{$filename}-rtl{$suffix}.css";
        if ( is_rtl() && in_array( $rtl_file, $files, true ) ) {
            $wp_styles->add_data( $style_handle, 'rtl', 'replace' );
            $wp_styles->add_data( $style_handle, 'suffix', $suffix );
            $wp_styles->add_data( $style_handle, 'path', str_replace( "{$suffix}.css", "-rtl{$suffix}.css", $path ) );
        }
    };

    foreach ( $core_blocks_meta as $name => $schema ) {
        /** This filter is documented in wp-includes/blocks.php */
        $schema = apply_filters( 'block_type_metadata', $schema );

        // Backfill these properties similar to `register_block_type_from_metadata()`.
        if ( ! isset( $schema['style'] ) ) {
            $schema['style'] = "wp-block-{$name}";
        }
        if ( ! isset( $schema['editorStyle'] ) ) {
            $schema['editorStyle'] = "wp-block-{$name}-editor";
        }

        // Register block theme styles.
        $register_style( $name, 'theme', "wp-block-{$name}-theme" );

        foreach ( $style_fields as $style_field => $filename ) {
            $style_handle = $schema[ $style_field ];
            if ( is_array( $style_handle ) ) {
                continue;
            }
            $register_style( $name, $filename, $style_handle );
        }
    }
}
add_action( 'init', 'register_core_block_style_handles', 9 );

/**
 * Registers core block types using metadata files.
 * Dynamic core blocks are registered separately.
 *
 * @since 5.5.0
 */
function register_core_block_types_from_metadata() {
    $block_folders = require BLOCKS_PATH . 'require-static-blocks.php';
    foreach ( $block_folders as $block_folder ) {
        register_block_type_from_metadata(
            BLOCKS_PATH . $block_folder
        );
    }
}
add_action( 'init', 'register_core_block_types_from_metadata' );

/**
 * Registers the core block metadata collection.
 *
 * This function is hooked into the 'init' action with a priority of 9,
 * ensuring that the core block metadata is registered before the regular
 * block initialization that happens at priority 10.
 *
 * @since 6.7.0
 */
function wp_register_core_block_metadata_collection() {
    wp_register_block_metadata_collection(
        BLOCKS_PATH,
        BLOCKS_PATH . 'blocks-json.php'
    );
}
add_action( 'init', 'wp_register_core_block_metadata_collection', 9 );