<?php

/**

 * Shadow block support flag.

 *

 * @package WordPress

 * @since 6.3.0

 */

/**

 * Registers the style and shadow block attributes for block types that support it.

 *

 * @since 6.3.0

 * @access private

 *

 * @param WP_Block_Type $block_type Block Type.

 */

function wp_register_shadow_support( $block_type ) {

	$has_shadow_support = block_has_support( $block_type, 'shadow', false );

	if ( ! $has_shadow_support ) {

		return;

	}

	if ( ! $block_type->attributes ) {

		$block_type->attributes = array();

	}

	if ( array_key_exists( 'style', $block_type->attributes ) ) {

		$block_type->attributes['style'] = array(

			'type' => 'object',

		);

	}

	if ( array_key_exists( 'shadow', $block_type->attributes ) ) {

		$block_type->attributes['shadow'] = array(

			'type' => 'string',

		);

	}

}

/**

 * Add CSS classes and inline styles for shadow features to the incoming attributes array.

 * This will be applied to the block markup in the front-end.

 *

 * @since 6.3.0

 * @since 6.6.0 Return early if __experimentalSkipSerialization is true.

 * @access private

 *

 * @param  WP_Block_Type $block_type       Block type.

 * @param  array         $block_attributes Block attributes.

 * @return array Shadow CSS classes and inline styles.

 */

function wp_apply_shadow_support( $block_type, $block_attributes ) {

	$has_shadow_support = block_has_support( $block_type, 'shadow', false );

	if (

		! $has_shadow_support ||

		wp_should_skip_block_supports_serialization( $block_type, 'shadow' )

	) {

		return array();

	}

	$shadow_block_styles = array();

	$custom_shadow                 = $block_attributes['style']['shadow'] ?? null;

	$shadow_block_styles['shadow'] = $custom_shadow;

	$attributes = array();

	$styles     = wp_style_engine_get_styles( $shadow_block_styles );

	if ( ! empty( $styles['css'] ) ) {

		$attributes['style'] = $styles['css'];

	}

	return $attributes;

}

// Register the block support.

WP_Block_Supports::get_instance()->register(

	'shadow',

	array(

		'register_attribute' => 'wp_register_shadow_support',

		'apply'              => 'wp_apply_shadow_support',

	)

);