<?php

/**

 * Block level presets support.

 *

 * @package WordPress

 * @since 6.2.0

 */

/**

 * Get the class name used on block level presets.

 *

 * @internal

 *

 * @since 6.2.0

 * @access private

 *

 * @param array $block Block object.

 * @return string      The unique class name.

 */

function _wp_get_presets_class_name( $block ) {

	return 'wp-settings-' . md5( serialize( $block ) );

}

/**

 * Update the block content with block level presets class name.

 *

 * @internal

 *

 * @since 6.2.0

 * @access private

 *

 * @param  string $block_content Rendered block content.

 * @param  array  $block         Block object.

 * @return string                Filtered block content.

 */

function _wp_add_block_level_presets_class( $block_content, $block ) {

	if ( ! $block_content ) {

		return $block_content;

	}

	// return early if the block doesn't have support for settings.

	$block_type = WP_Block_Type_Registry::get_instance()->get_registered( $block['blockName'] );

	if ( ! block_has_support( $block_type, '__experimentalSettings', false ) ) {

		return $block_content;

	}

	// return early if no settings are found on the block attributes.

	$block_settings = isset( $block['attrs']['settings'] ) ? $block['attrs']['settings'] : null;

	if ( empty( $block_settings ) ) {

		return $block_content;

	}

	// Like the layout hook this assumes the hook only applies to blocks with a single wrapper.

	// Add the class name to the first element, presuming it's the wrapper, if it exists.

	$tags = new WP_HTML_Tag_Processor( $block_content );

	if ( $tags->next_tag() ) {

		$tags->add_class( _wp_get_presets_class_name( $block ) );

	}

	return $tags->get_updated_html();

}

/**

 * Render the block level presets stylesheet.

 *

 * @internal

 *

 * @since 6.2.0

 * @since 6.3.0 Updated preset styles to use Selectors API.

 * @access private

 *

 * @param string|null $pre_render   The pre-rendered content. Default null.

 * @param array       $block The block being rendered.

 *

 * @return null

 */

function _wp_add_block_level_preset_styles( $pre_render, $block ) {

	// Return early if the block has not support for descendent block styles.

	$block_type = WP_Block_Type_Registry::get_instance()->get_registered( $block['blockName'] );

	if ( ! block_has_support( $block_type, '__experimentalSettings', false ) ) {

		return null;

	}

	// return early if no settings are found on the block attributes.

	$block_settings = isset( $block['attrs']['settings'] ) ? $block['attrs']['settings'] : null;

	if ( empty( $block_settings ) ) {

		return null;

	}

	$class_name = '.' . _wp_get_presets_class_name( $block );

	// the root selector for preset variables needs to target every possible block selector

	// in order for the general setting to override any bock specific setting of a parent block or

	// the site root.

	$variables_root_selector = '*,[class*="wp-block"]';

	$registry                = WP_Block_Type_Registry::get_instance();

	$blocks                  = $registry->get_all_registered();

	foreach ( $blocks as $block_type ) {

		/*

		 * We only want to append selectors for blocks using custom selectors

		 * i.e. not `wp-block-<name>`.

		 */

		$has_custom_selector =

			( isset( $block_type->supports['__experimentalSelector'] ) && is_string( $block_type->supports['__experimentalSelector'] ) ) ||

			( isset( $block_type->selectors['root'] ) && is_string( $block_type->selectors['root'] ) );

		if ( $has_custom_selector ) {

			$variables_root_selector .= ',' . wp_get_block_css_selector( $block_type );

		}

	}

	$variables_root_selector = WP_Theme_JSON::scope_selector( $class_name, $variables_root_selector );

	// Remove any potentially unsafe styles.

	$theme_json_shape  = WP_Theme_JSON::remove_insecure_properties(

		array(

			'version'  => WP_Theme_JSON::LATEST_SCHEMA,

			'settings' => $block_settings,

		)

	);

	$theme_json_object = new WP_Theme_JSON( $theme_json_shape );

	$styles = '';

	// include preset css variables declaration on the stylesheet.

	$styles .= $theme_json_object->get_stylesheet(

		array( 'variables' ),

		null,

		array(

			'root_selector' => $variables_root_selector,

			'scope'         => $class_name,

		)

	);

	// include preset css classes on the the stylesheet.

	$styles .= $theme_json_object->get_stylesheet(

		array( 'presets' ),

		null,

		array(

			'root_selector' => $class_name . ',' . $class_name . ' *',

			'scope'         => $class_name,

		)

	);

	if ( ! empty( $styles ) ) {

		wp_enqueue_block_support_styles( $styles );

	}

	return null;

}

add_filter( 'render_block', '_wp_add_block_level_presets_class', 10, 2 );

add_filter( 'pre_render_block', '_wp_add_block_level_preset_styles', 10, 2 );