<?php

/**

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

 *

 * @package WordPress

 */

/**

 * Renders the `core/post-comments` block on the server.

 *

 * @param array    $attributes Block attributes.

 * @param string   $content    Block default content.

 * @param WP_Block $block      Block instance.

 * @return string Returns the filtered post comments for the current post wrapped inside "p" tags.

 */

function render_block_core_post_comments( $attributes, $content, $block ) {

	global $post;

	$post_id = $block->context['postId'];

	if ( ! isset( $post_id ) ) {

		return '';

	}

	$comment_args = array(

		'post_id' => $post_id,

		'count'   => true,

	);

	// Return early if there are no comments and comments are closed.

	if ( ! comments_open( $post_id ) && get_comments( $comment_args ) === 0 ) {

		return '';

	}

	$post_before = $post;

	$post        = get_post( $post_id );

	setup_postdata( $post );

	ob_start();

	// There's a deprecation warning generated by WP Core.

	// Ideally this deprecation is removed from Core.

	// In the meantime, this removes it from the output.

	add_filter( 'deprecated_file_trigger_error', '__return_false' );

	comments_template();

	remove_filter( 'deprecated_file_trigger_error', '__return_false' );

	$post = $post_before;

	$classes = '';

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

		$classes .= 'has-text-align-' . $attributes['textAlign'];

	}

	$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => $classes ) );

	$output             = ob_get_clean();

	return sprintf( '<div %1$s>%2$s</div>', $wrapper_attributes, $output );

}

/**

 * Registers the `core/post-comments` block on the server.

 */

function register_block_core_post_comments() {

	register_block_type_from_metadata(

		__DIR__ . '/post-comments',

		array(

			'render_callback' => 'render_block_core_post_comments',

		)

	);

}

add_action( 'init', 'register_block_core_post_comments' );

/**

 * Use the button block classes for the form-submit button.

 *

 * @param array $fields The default comment form arguments.

 *

 * @return array Returns the modified fields.

 */

function post_comments_block_form_defaults( $fields ) {

	if ( wp_is_block_theme() ) {

		$fields['submit_button'] = '<input name="%1$s" type="submit" id="%2$s" class="%3$s wp-block-button__link" value="%4$s" />';

		$fields['submit_field']  = '<p class="form-submit wp-block-button">%1$s %2$s</p>';

	}

	return $fields;

}

add_filter( 'comment_form_defaults', 'post_comments_block_form_defaults' );