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

/**
* Determines whether a block list contains a block that uses the featured image.
*
* @since 6.0.0
*
* @param WP_Block_List $inner_blocks Inner block instance.
*
* @return bool Whether the block list contains a block that uses the featured image.
*/
function block_core_post_template_uses_featured_image( $inner_blocks ) {
foreach ( $inner_blocks as $block ) {
if ( 'core/post-featured-image' === $block->name ) {
return true;
}
if (
'core/cover' === $block->name &&
! empty( $block->attributes['useFeaturedImage'] )
) {
return true;
}
if ( $block->inner_blocks && block_core_post_template_uses_featured_image( $block->inner_blocks ) ) {
return true;
}
}

return false;
}

/**
* Renders the `core/post-template` block on the server.
*
* @since 6.3.0 Changed render_block_context priority to `1`.
*
* @global WP_Query $wp_query WordPress Query object.
*
* @param array $attributes Block attributes.
* @param string $content Block default content.
* @param WP_Block $block Block instance.
*
* @return string Returns the output of the query, structured using the layout defined by the block's inner blocks.
*/
function render_block_core_post_template( $attributes, $content, $block ) {
$page_key = isset( $block->context['queryId'] ) ? 'query-' . $block->context['queryId'] . '-page' : 'query-page';
$enhanced_pagination = isset( $block->context['enhancedPagination'] ) && $block->context['enhancedPagination'];
$page = empty( $_GET[ $page_key ] ) ? 1 : (int) $_GET[ $page_key ];

// Use global query if needed.
$use_global_query = ( isset( $block->context['query']['inherit'] ) && $block->context['query']['inherit'] );
if ( $use_global_query ) {
global $wp_query;

/*
* If already in the main query loop, duplicate the query instance to not tamper with the main instance.
* Since this is a nested query, it should start at the beginning, therefore rewind posts.
* Otherwise, the main query loop has not started yet and this block is responsible for doing so.
*/
if ( in_the_loop() ) {
$query = clone $wp_query;
$query->rewind_posts();
} else {
$query = $wp_query;
}
} else {
$query_args = build_query_vars_from_query_block( $block, $page );
$query = new WP_Query( $query_args );
}

if ( ! $query->have_posts() ) {
return '';
}

if ( block_core_post_template_uses_featured_image( $block->inner_blocks ) ) {
update_post_thumbnail_cache( $query );
}

$classnames = '';
if ( isset( $block->context['displayLayout'] ) && isset( $block->context['query'] ) ) {
if ( isset( $block->context['displayLayout']['type'] ) && 'flex' === $block->context['displayLayout']['type'] ) {
$classnames = "is-flex-container columns-{$block->context['displayLayout']['columns']}";
}
}
if ( isset( $attributes['style']['elements']['link']['color']['text'] ) ) {
$classnames .= ' has-link-color';
}

// Ensure backwards compatibility by flagging the number of columns via classname when using grid layout.
if ( isset( $attributes['layout']['type'] ) && 'grid' === $attributes['layout']['type'] && ! empty( $attributes['layout']['columnCount'] ) ) {
$classnames .= ' ' . sanitize_title( 'columns-' . $attributes['layout']['columnCount'] );
}

$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => trim( $classnames ) ) );

$content = '';
while ( $query->have_posts() ) {
$query->the_post();

// Get an instance of the current Post Template block.
$block_instance = $block->parsed_block;

// Set the block name to one that does not correspond to an existing registered block.
// This ensures that for the inner instances of the Post Template block, we do not render any block supports.
$block_instance['blockName'] = 'core/null';

$post_id = get_the_ID();
$post_type = get_post_type();
$filter_block_context = static function ( $context ) use ( $post_id, $post_type ) {
$context['postType'] = $post_type;
$context['postId'] = $post_id;
return $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 );
// Render the inner blocks of the Post Template block with `dynamic` set to `false` to prevent calling
// `render_callback` and ensure that no wrapper markup is included.
$block_content = ( new WP_Block( $block_instance ) )->render( array( 'dynamic' => false ) );
remove_filter( 'render_block_context', $filter_block_context, 1 );

// Wrap the render inner blocks in a `li` element with the appropriate post classes.
$post_classes = implode( ' ', get_post_class( 'wp-block-post' ) );

$inner_block_directives = $enhanced_pagination ? ' data-wp-key="post-template-item-' . $post_id . '"' : '';

$content .= '<li' . $inner_block_directives . ' class="' . esc_attr( $post_classes ) . '">' . $block_content . '</li>';
}

/*
* Use this function to restore the context of the template tags
* from a secondary query loop back to the main query loop.
* Since we use two custom loops, it's safest to always restore.
*/
wp_reset_postdata();

return sprintf(
'<ul %1$s>%2$s</ul>',
$wrapper_attributes,
$content
);
}

/**
* Registers the `core/post-template` block on the server.
*
* @since 5.8.0
*/
function register_block_core_post_template() {
register_block_type_from_metadata(
__DIR__ . '/post-template',
array(
'render_callback' => 'render_block_core_post_template',
'skip_inner_blocks' => true,
)
);
}
add_action( 'init', 'register_block_core_post_template' );