<?php

/**

 * Spacing block support flag.

 *

 * For backwards compatibility, this remains separate to the dimensions.php

 * block support despite both belonging under a single panel in the editor.

 *

 * @package WordPress

 * @since 5.8.0

 */

/**

 * Registers the style block attribute for block types that support it.

 *

 * @since 5.8.0

 * @access private

 *

 * @param WP_Block_Type $block_type Block Type.

 */

function wp_register_spacing_support( $block_type ) {

	$has_spacing_support = block_has_support( $block_type, 'spacing', false );

	// Setup attributes and styles within that if needed.

	if ( ! $block_type->attributes ) {

		$block_type->attributes = array();

	}

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

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

			'type' => 'object',

		);

	}

}

/**

 * Adds CSS classes for block spacing to the incoming attributes array.

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

 *

 * @since 5.8.0

 * @since 6.1.0 Implemented the style engine to generate CSS and classnames.

 * @access private

 *

 * @param WP_Block_Type $block_type       Block Type.

 * @param array         $block_attributes Block attributes.

 * @return array Block spacing CSS classes and inline styles.

 */

function wp_apply_spacing_support( $block_type, $block_attributes ) {

	if ( wp_should_skip_block_supports_serialization( $block_type, 'spacing' ) ) {

		return array();

	}

	$attributes          = array();

	$has_padding_support = block_has_support( $block_type, array( 'spacing', 'padding' ), false );

	$has_margin_support  = block_has_support( $block_type, array( 'spacing', 'margin' ), false );

	$block_styles        = isset( $block_attributes['style'] ) ? $block_attributes['style'] : null;

	if ( ! $block_styles ) {

		return $attributes;

	}

	$skip_padding         = wp_should_skip_block_supports_serialization( $block_type, 'spacing', 'padding' );

	$skip_margin          = wp_should_skip_block_supports_serialization( $block_type, 'spacing', 'margin' );

	$spacing_block_styles = array(

		'padding' => null,

		'margin'  => null,

	);

	if ( $has_padding_support && ! $skip_padding ) {

		$spacing_block_styles['padding'] = isset( $block_styles['spacing']['padding'] ) ? $block_styles['spacing']['padding'] : null;

	}

	if ( $has_margin_support && ! $skip_margin ) {

		$spacing_block_styles['margin'] = isset( $block_styles['spacing']['margin'] ) ? $block_styles['spacing']['margin'] : null;

	}

	$styles = wp_style_engine_get_styles( array( 'spacing' => $spacing_block_styles ) );

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

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

	}

	return $attributes;

}

// Register the block support.

WP_Block_Supports::get_instance()->register(

	'spacing',

	array(

		'register_attribute' => 'wp_register_spacing_support',

		'apply'              => 'wp_apply_spacing_support',

	)

);