<?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',
)
);