<?php
/**
* Server-side rendering of the `core/comment-template` block.
*
* @package WordPress
*/

/**
* Function that recursively renders a list of nested comments.
*
* @since 6.3.0 Changed render_block_context priority to `1`.
*
* @global int $comment_depth
*
* @param WP_Comment[] $comments The array of comments.
* @param WP_Block $block Block instance.
* @return string
*/
function block_core_comment_template_render_comments( $comments, $block ) {
global $comment_depth;
$thread_comments = get_option( 'thread_comments' );
$thread_comments_depth = get_option( 'thread_comments_depth' );

if ( empty( $comment_depth ) ) {
$comment_depth = 1;
}

$content = '';
foreach ( $comments as $comment ) {
$comment_id = $comment->comment_ID;
$filter_block_context = static function ( $context ) use ( $comment_id ) {
$context['commentId'] = $comment_id;
return $context;
};

/*
* We set commentId context through the `render_block_context` filter so
* that dynamically inserted blocks (at `render_block` filter stage)
* will also receive that context.
*
* Use an early priority to so that other 'render_block_context' filters
* have access to the values.
*/
add_filter( 'render_block_context', $filter_block_context, 1 );

/*
* We construct a new WP_Block instance from the parsed block so that
* it'll receive any changes made by the `render_block_data` filter.
*/
$block_content = ( new WP_Block( $block->parsed_block ) )->render( array( 'dynamic' => false ) );

remove_filter( 'render_block_context', $filter_block_context, 1 );

$children = $comment->get_children();

/*
* We need to create the CSS classes BEFORE recursing into the children.
* This is because comment_class() uses globals like `$comment_alt`
* and `$comment_thread_alt` which are order-sensitive.
*
* The `false` parameter at the end means that we do NOT want the function
* to `echo` the output but to return a string.
* See https://developer.wordpress.org/reference/functions/comment_class/#parameters.
*/
$comment_classes = comment_class( '', $comment->comment_ID, $comment->comment_post_ID, false );

// If the comment has children, recurse to create the HTML for the nested
// comments.
if ( ! empty( $children ) && ! empty( $thread_comments ) ) {
if ( $comment_depth < $thread_comments_depth ) {
++$comment_depth;
$inner_content = block_core_comment_template_render_comments(
$children,
$block
);
$block_content .= sprintf( '<ol>%1$s</ol>', $inner_content );
--$comment_depth;
} else {
$block_content .= block_core_comment_template_render_comments(
$children,
$block
);
}
}

$content .= sprintf( '<li id="comment-%1$s" %2$s>%3$s</li>', $comment->comment_ID, $comment_classes, $block_content );
}

return $content;
}

/**
* Renders the `core/comment-template` block on the server.
*
* @since 6.0.0
*
* @param array $attributes Block attributes.
* @param string $content Block default content.
* @param WP_Block $block Block instance.
*
* @return string Returns the HTML representing the comments using the layout
* defined by the block's inner blocks.
*/
function render_block_core_comment_template( $attributes, $content, $block ) {
// Bail out early if the post ID is not set for some reason.
if ( empty( $block->context['postId'] ) ) {
return '';
}

if ( post_password_required( $block->context['postId'] ) ) {
return;
}

$comment_query = new WP_Comment_Query(
build_comment_query_vars_from_block( $block )
);

// Get an array of comments for the current post.
$comments = $comment_query->get_comments();
if ( count( $comments ) === 0 ) {
return '';
}

$comment_order = get_option( 'comment_order' );

if ( 'desc' === $comment_order ) {
$comments = array_reverse( $comments );
}

$wrapper_attributes = get_block_wrapper_attributes();

return sprintf(
'<ol %1$s>%2$s</ol>',
$wrapper_attributes,
block_core_comment_template_render_comments( $comments, $block )
);
}

/**
* Registers the `core/comment-template` block on the server.
*
* @since 6.0.0
*/
function register_block_core_comment_template() {
register_block_type_from_metadata(
__DIR__ . '/comment-template',
array(
'render_callback' => 'render_block_core_comment_template',
'skip_inner_blocks' => true,
)
);
}
add_action( 'init', 'register_block_core_comment_template' );