<?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 );