<?php

/**

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

 *

 * @package WordPress

 */

/**

 * When the `core/file` block is rendering, check if we need to enqueue the `wp-block-file-view` script.

 *

 * @since 5.8.0

 *

 * @param array    $attributes The block attributes.

 * @param string   $content    The block content.

 * @param WP_Block $block      The parsed block.

 *

 * @return string Returns the block content.

 */

function render_block_core_file( $attributes, $content ) {

	// If it's interactive, enqueue the script module and add the directives.

	if ( ! empty( $attributes['displayPreview'] ) ) {

		wp_enqueue_script_module( '@wordpress/block-library/file/view' );

		$processor = new WP_HTML_Tag_Processor( $content );

		$processor->next_tag();

		$processor->set_attribute( 'data-wp-interactive', 'core/file' );

		$processor->next_tag( 'object' );

		$processor->set_attribute( 'data-wp-bind--hidden', '!state.hasPdfPreview' );

		$processor->set_attribute( 'hidden', true );

		$filename     = $processor->get_attribute( 'aria-label' );

		$has_filename = ! empty( $filename ) && 'PDF embed' !== $filename;

		$label        = $has_filename ? sprintf(

			/* translators: %s: filename. */

			__( 'Embed of %s.' ),

			$filename

		) : __( 'PDF embed' );

		// Update object's aria-label attribute if present in block HTML.

		// Match an aria-label attribute from an object tag.

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

		return $processor->get_updated_html();

	}

	return $content;

}

/**

 * Registers the `core/file` block on server.

 *

 * @since 5.8.0

 */

function register_block_core_file() {

	register_block_type_from_metadata(

		__DIR__ . '/file',

		array(

			'render_callback' => 'render_block_core_file',

		)

	);

}

add_action( 'init', 'register_block_core_file' );