<?php
/**
* Server-side rendering of the `core/post-comments-form` block.
*
* @package WordPress
*/

/**
* Renders the `core/post-comments-form` 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 filtered post comments form for the current post.
*/
function render_block_core_post_comments_form( $attributes, $content, $block ) {
if ( ! isset( $block->context['postId'] ) ) {
return '';
}

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

$classes = array( 'comment-respond' ); // See comment further below.
if ( isset( $attributes['textAlign'] ) ) {
$classes[] = 'has-text-align-' . $attributes['textAlign'];
}
if ( isset( $attributes['style']['elements']['link']['color']['text'] ) ) {
$classes[] = 'has-link-color';
}
$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => implode( ' ', $classes ) ) );

add_filter( 'comment_form_defaults', 'post_comments_form_block_form_defaults' );

ob_start();
comment_form( array(), $block->context['postId'] );
$form = ob_get_clean();

remove_filter( 'comment_form_defaults', 'post_comments_form_block_form_defaults' );

// We use the outermost wrapping `<div />` returned by `comment_form()`
// which is identified by its default classname `comment-respond` to inject
// our wrapper attributes. This way, it is guaranteed that all styling applied
// to the block is carried along when the comment form is moved to the location
// of the 'Reply' link that the user clicked by Core's `comment-reply.js` script.
$form = str_replace( 'class="comment-respond"', $wrapper_attributes, $form );

// Enqueue the comment-reply script.
wp_enqueue_script( 'comment-reply' );

return $form;
}

/**
* Registers the `core/post-comments-form` block on the server.
*
* @since 6.0.0
*/
function register_block_core_post_comments_form() {
register_block_type_from_metadata(
__DIR__ . '/post-comments-form',
array(
'render_callback' => 'render_block_core_post_comments_form',
)
);
}
add_action( 'init', 'register_block_core_post_comments_form' );

/**
* Use the button block classes for the form-submit button.
*
* @since 6.0.0
*
* @param array $fields The default comment form arguments.
*
* @return array Returns the modified fields.
*/
function post_comments_form_block_form_defaults( $fields ) {
if ( wp_is_block_theme() ) {
$fields['submit_button'] = '<input name="%1$s" type="submit" id="%2$s" class="wp-block-button__link ' . wp_theme_get_element_class_name( 'button' ) . '" value="%4$s" />';
$fields['submit_field'] = '<p class="form-submit wp-block-button">%1$s %2$s</p>';
}

return $fields;
}