<?php

/**

 * Server-side rendering of the `core/cover` block.

 *

 * @package WordPress

 */

/**

 * Renders the `core/cover` block on server.

 *

 * @since 6.0.0

 *

 * @param array  $attributes The block attributes.

 * @param string $content    The block rendered content.

 *

 * @return string Returns the cover block markup, if useFeaturedImage is true.

 */

function render_block_core_cover( $attributes, $content ) {

	if ( 'image' !== $attributes['backgroundType'] || false === $attributes['useFeaturedImage'] ) {

		return $content;

	}

	$object_position = isset( $attributes['focalPoint'] )

		? round( $attributes['focalPoint']['x'] * 100 ) . '% ' . round( $attributes['focalPoint']['y'] * 100 ) . '%'

		: null;

	if ( ! ( $attributes['hasParallax'] || $attributes['isRepeated'] ) ) {

		$attr = array(

			'class'           => 'wp-block-cover__image-background',

			'data-object-fit' => 'cover',

		);

		if ( $object_position ) {

			$attr['data-object-position'] = $object_position;

			$attr['style']                = 'object-position:' . $object_position . ';';

		}

		$image = get_the_post_thumbnail( null, $attributes['sizeSlug'] ?? 'post-thumbnail', $attr );

	} else {

		if ( in_the_loop() ) {

			update_post_thumbnail_cache();

		}

		$current_featured_image = get_the_post_thumbnail_url( null, $attributes['sizeSlug'] ?? null );

		if ( ! $current_featured_image ) {

			return $content;

		}

		$current_thumbnail_id = get_post_thumbnail_id();

		$processor = new WP_HTML_Tag_Processor( '<div></div>' );

		$processor->next_tag();

		$current_alt = trim( strip_tags( get_post_meta( $current_thumbnail_id, '_wp_attachment_image_alt', true ) ) );

		if ( $current_alt ) {

			$processor->set_attribute( 'role', 'img' );

			$processor->set_attribute( 'aria-label', $current_alt );

		}

		$processor->add_class( 'wp-block-cover__image-background' );

		$processor->add_class( 'wp-image-' . $current_thumbnail_id );

		if ( $attributes['hasParallax'] ) {

			$processor->add_class( 'has-parallax' );

		}

		if ( $attributes['isRepeated'] ) {

			$processor->add_class( 'is-repeated' );

		}

		$styles  = 'background-position:' . ( $object_position ?? '50% 50%' ) . ';';

		$styles .= 'background-image:url(' . esc_url( $current_featured_image ) . ');';

		$processor->set_attribute( 'style', $styles );

		$image = $processor->get_updated_html();

	}

	/*

	 * Inserts the featured image between the (1st) cover 'background' `span` and 'inner_container' `div`,

	 * and removes eventual whitespace characters between the two (typically introduced at template level)

	 */

	$inner_container_start = '/<div\b[^>]+wp-block-cover__inner-container[\s|"][^>]*>/U';

	if ( 1 === preg_match( $inner_container_start, $content, $matches, PREG_OFFSET_CAPTURE ) ) {

		$offset  = $matches[0][1];

		$content = substr( $content, 0, $offset ) . $image . substr( $content, $offset );

	}

	return $content;

}

/**

 * Registers the `core/cover` block renderer on server.

 *

 * @since 6.0.0

 */

function register_block_core_cover() {

	register_block_type_from_metadata(

		__DIR__ . '/cover',

		array(

			'render_callback' => 'render_block_core_cover',

		)

	);

}

add_action( 'init', 'register_block_core_cover' );