<?php
/**
* Position block support flag.
*
* @package WordPress
* @since 6.2.0
*/

/**
* Registers the style block attribute for block types that support it.
*
* @since 6.2.0
* @access private
*
* @param WP_Block_Type $block_type Block Type.
*/
function wp_register_position_support( $block_type ) {
$has_position_support = block_has_support( $block_type, 'position', false );

// Set up attributes and styles within that if needed.
if ( ! $block_type->attributes ) {
$block_type->attributes = array();
}

if ( $has_position_support && ! array_key_exists( 'style', $block_type->attributes ) ) {
$block_type->attributes['style'] = array(
'type' => 'object',
);
}
}

/**
* Renders position styles to the block wrapper.
*
* @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_render_position_support( $block_content, $block ) {
$block_type = WP_Block_Type_Registry::get_instance()->get_registered( $block['blockName'] );
$has_position_support = block_has_support( $block_type, 'position', false );

if (
! $has_position_support ||
empty( $block['attrs']['style']['position'] )
) {
return $block_content;
}

$global_settings = wp_get_global_settings();
$theme_has_sticky_support = isset( $global_settings['position']['sticky'] ) ? $global_settings['position']['sticky'] : false;
$theme_has_fixed_support = isset( $global_settings['position']['fixed'] ) ? $global_settings['position']['fixed'] : false;

// Only allow output for position types that the theme supports.
$allowed_position_types = array();
if ( true === $theme_has_sticky_support ) {
$allowed_position_types[] = 'sticky';
}
if ( true === $theme_has_fixed_support ) {
$allowed_position_types[] = 'fixed';
}

$style_attribute = isset( $block['attrs']['style'] ) ? $block['attrs']['style'] : null;
$class_name = wp_unique_id( 'wp-container-' );
$selector = ".$class_name";
$position_styles = array();
$position_type = isset( $style_attribute['position']['type'] ) ? $style_attribute['position']['type'] : '';
$wrapper_classes = array();

if (
in_array( $position_type, $allowed_position_types, true )
) {
$wrapper_classes[] = $class_name;
$wrapper_classes[] = 'is-position-' . $position_type;
$sides = array( 'top', 'right', 'bottom', 'left' );

foreach ( $sides as $side ) {
$side_value = isset( $style_attribute['position'][ $side ] ) ? $style_attribute['position'][ $side ] : null;
if ( null !== $side_value ) {
/*
* For fixed or sticky top positions,
* ensure the value includes an offset for the logged in admin bar.
*/
if (
'top' === $side &&
( 'fixed' === $position_type || 'sticky' === $position_type )
) {
// Ensure 0 values can be used in `calc()` calculations.
if ( '0' === $side_value || 0 === $side_value ) {
$side_value = '0px';
}

// Ensure current side value also factors in the height of the logged in admin bar.
$side_value = "calc($side_value + var(--wp-admin--admin-bar--position-offset, 0px))";
}

$position_styles[] =
array(
'selector' => $selector,
'declarations' => array(
$side => $side_value,
),
);
}
}

$position_styles[] =
array(
'selector' => $selector,
'declarations' => array(
'position' => $position_type,
'z-index' => '10',
),
);
}

if ( ! empty( $position_styles ) ) {
/*
* Add to the style engine store to enqueue and render position styles.
*/
wp_style_engine_get_stylesheet_from_css_rules(
$position_styles,
array(
'context' => 'block-supports',
'prettify' => false,
)
);

// Inject class name to block container markup.
$content = new WP_HTML_Tag_Processor( $block_content );
$content->next_tag();
foreach ( $wrapper_classes as $class ) {
$content->add_class( $class );
}
return (string) $content;
}

return $block_content;
}

// Register the block support.
WP_Block_Supports::get_instance()->register(
'position',
array(
'register_attribute' => 'wp_register_position_support',
)
);
add_filter( 'render_block', 'wp_render_position_support', 10, 2 );