<?php

/**

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

 *

 * @package WordPress

 */

/**

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

 *

 * @param array $attributes The block attributes.

 * @param array $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;

	}

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

		$attr = array(

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

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

		);

		if ( isset( $attributes['focalPoint'] ) ) {

			$object_position              = round( $attributes['focalPoint']['x'] * 100 ) . '%' . ' ' . round( $attributes['focalPoint']['y'] * 100 ) . '%';

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

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

		}

		$image = get_the_post_thumbnail( null, 'post-thumbnail', $attr );

		/*

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

		 * and removes eventual withespace 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 );

		}

	} else {

		if ( in_the_loop() ) {

			update_post_thumbnail_cache();

		}

		$current_featured_image = get_the_post_thumbnail_url();

		$content                = preg_replace(

			'/class=\".*?\"/',

			'${0} style="background-image:url(' . esc_url( $current_featured_image ) . ')"',

			$content,

			1

		);

	}

	return $content;

}

/**

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

 */

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' );