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

/**
* The excerpt length set by the Latest Posts core block
* set at render time and used by the block itself.
*
* @var int
*/
global $block_core_latest_posts_excerpt_length;
$block_core_latest_posts_excerpt_length = 0;

/**
* Callback for the excerpt_length filter used by
* the Latest Posts block at render time.
*
* @since 5.4.0
*
* @return int Returns the global $block_core_latest_posts_excerpt_length variable
* to allow the excerpt_length filter respect the Latest Block setting.
*/
function block_core_latest_posts_get_excerpt_length() {
global $block_core_latest_posts_excerpt_length;
return $block_core_latest_posts_excerpt_length;
}

/**
* Renders the `core/latest-posts` block on server.
*
* @since 5.0.0
*
* @param array $attributes The block attributes.
*
* @return string Returns the post content with latest posts added.
*/
function render_block_core_latest_posts( $attributes ) {
global $post, $block_core_latest_posts_excerpt_length;

$args = array(
'posts_per_page' => $attributes['postsToShow'],
'post_status' => 'publish',
'order' => $attributes['order'],
'orderby' => $attributes['orderBy'],
'ignore_sticky_posts' => true,
'no_found_rows' => true,
);

$block_core_latest_posts_excerpt_length = $attributes['excerptLength'];
add_filter( 'excerpt_length', 'block_core_latest_posts_get_excerpt_length', 20 );

if ( ! empty( $attributes['categories'] ) ) {
$args['category__in'] = array_column( $attributes['categories'], 'id' );
}
if ( isset( $attributes['selectedAuthor'] ) ) {
$args['author'] = $attributes['selectedAuthor'];
}

$query = new WP_Query();
$recent_posts = $query->query( $args );

if ( isset( $attributes['displayFeaturedImage'] ) && $attributes['displayFeaturedImage'] ) {
update_post_thumbnail_cache( $query );
}

$list_items_markup = '';

foreach ( $recent_posts as $post ) {
$post_link = esc_url( get_permalink( $post ) );
$title = get_the_title( $post );

if ( ! $title ) {
$title = __( '(no title)' );
}

$list_items_markup .= '<li>';

if ( $attributes['displayFeaturedImage'] && has_post_thumbnail( $post ) ) {
$image_style = '';
if ( isset( $attributes['featuredImageSizeWidth'] ) ) {
$image_style .= sprintf( 'max-width:%spx;', $attributes['featuredImageSizeWidth'] );
}
if ( isset( $attributes['featuredImageSizeHeight'] ) ) {
$image_style .= sprintf( 'max-height:%spx;', $attributes['featuredImageSizeHeight'] );
}

$image_classes = 'wp-block-latest-posts__featured-image';
if ( isset( $attributes['featuredImageAlign'] ) ) {
$image_classes .= ' align' . $attributes['featuredImageAlign'];
}

$featured_image = get_the_post_thumbnail(
$post,
$attributes['featuredImageSizeSlug'],
array(
'style' => esc_attr( $image_style ),
)
);
if ( $attributes['addLinkToFeaturedImage'] ) {
$featured_image = sprintf(
'<a href="%1$s" aria-label="%2$s">%3$s</a>',
esc_url( $post_link ),
esc_attr( $title ),
$featured_image
);
}
$list_items_markup .= sprintf(
'<div class="%1$s">%2$s</div>',
esc_attr( $image_classes ),
$featured_image
);
}

$list_items_markup .= sprintf(
'<a class="wp-block-latest-posts__post-title" href="%1$s">%2$s</a>',
esc_url( $post_link ),
$title
);

if ( isset( $attributes['displayAuthor'] ) && $attributes['displayAuthor'] ) {
$author_display_name = get_the_author_meta( 'display_name', $post->post_author );

/* translators: byline. %s: author. */
$byline = sprintf( __( 'by %s' ), $author_display_name );

if ( ! empty( $author_display_name ) ) {
$list_items_markup .= sprintf(
'<div class="wp-block-latest-posts__post-author">%1$s</div>',
$byline
);
}
}

if ( isset( $attributes['displayPostDate'] ) && $attributes['displayPostDate'] ) {
$list_items_markup .= sprintf(
'<time datetime="%1$s" class="wp-block-latest-posts__post-date">%2$s</time>',
esc_attr( get_the_date( 'c', $post ) ),
get_the_date( '', $post )
);
}

if ( isset( $attributes['displayPostContent'] ) && $attributes['displayPostContent']
&& isset( $attributes['displayPostContentRadio'] ) && 'excerpt' === $attributes['displayPostContentRadio'] ) {

$trimmed_excerpt = get_the_excerpt( $post );

/*
* Adds a "Read more" link with screen reader text.
* [&hellip;] is the default excerpt ending from wp_trim_excerpt() in Core.
*/
if ( str_ends_with( $trimmed_excerpt, ' [&hellip;]' ) ) {
/** This filter is documented in wp-includes/formatting.php */
$excerpt_length = (int) apply_filters( 'excerpt_length', $block_core_latest_posts_excerpt_length );
if ( $excerpt_length <= $block_core_latest_posts_excerpt_length ) {
$trimmed_excerpt = substr( $trimmed_excerpt, 0, -11 );
$trimmed_excerpt .= sprintf(
/* translators: 1: A URL to a post, 2: Hidden accessibility text: Post title */
__( '… <a class="wp-block-latest-posts__read-more" href="%1$s" rel="noopener noreferrer">Read more<span class="screen-reader-text">: %2$s</span></a>' ),
esc_url( $post_link ),
esc_html( $title )
);
}
}

if ( post_password_required( $post ) ) {
$trimmed_excerpt = __( 'This content is password protected.' );
}

$list_items_markup .= sprintf(
'<div class="wp-block-latest-posts__post-excerpt">%1$s</div>',
$trimmed_excerpt
);
}

if ( isset( $attributes['displayPostContent'] ) && $attributes['displayPostContent']
&& isset( $attributes['displayPostContentRadio'] ) && 'full_post' === $attributes['displayPostContentRadio'] ) {

$post_content = html_entity_decode( $post->post_content, ENT_QUOTES, get_option( 'blog_charset' ) );

if ( post_password_required( $post ) ) {
$post_content = __( 'This content is password protected.' );
}

$list_items_markup .= sprintf(
'<div class="wp-block-latest-posts__post-full-content">%1$s</div>',
wp_kses_post( $post_content )
);
}

$list_items_markup .= "</li>\n";
}

remove_filter( 'excerpt_length', 'block_core_latest_posts_get_excerpt_length', 20 );

$classes = array( 'wp-block-latest-posts__list' );
if ( isset( $attributes['postLayout'] ) && 'grid' === $attributes['postLayout'] ) {
$classes[] = 'is-grid';
}
if ( isset( $attributes['columns'] ) && 'grid' === $attributes['postLayout'] ) {
$classes[] = 'columns-' . $attributes['columns'];
}
if ( isset( $attributes['displayPostDate'] ) && $attributes['displayPostDate'] ) {
$classes[] = 'has-dates';
}
if ( isset( $attributes['displayAuthor'] ) && $attributes['displayAuthor'] ) {
$classes[] = 'has-author';
}
if ( isset( $attributes['style']['elements']['link']['color']['text'] ) ) {
$classes[] = 'has-link-color';
}

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

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

/**
* Registers the `core/latest-posts` block on server.
*
* @since 5.0.0
*/
function register_block_core_latest_posts() {
register_block_type_from_metadata(
__DIR__ . '/latest-posts',
array(
'render_callback' => 'render_block_core_latest_posts',
)
);
}
add_action( 'init', 'register_block_core_latest_posts' );

/**
* Handles outdated versions of the `core/latest-posts` block by converting
* attribute `categories` from a numeric string to an array with key `id`.
*
* This is done to accommodate the changes introduced in #20781 that sought to
* add support for multiple categories to the block. However, given that this
* block is dynamic, the usual provisions for block migration are insufficient,
* as they only act when a block is loaded in the editor.
*
* TODO: Remove when and if the bottom client-side deprecation for this block
* is removed.
*
* @since 5.5.0
*
* @param array $block A single parsed block object.
*
* @return array The migrated block object.
*/
function block_core_latest_posts_migrate_categories( $block ) {
if (
'core/latest-posts' === $block['blockName'] &&
! empty( $block['attrs']['categories'] ) &&
is_string( $block['attrs']['categories'] )
) {
$block['attrs']['categories'] = array(
array( 'id' => absint( $block['attrs']['categories'] ) ),
);
}

return $block;
}
add_filter( 'render_block_data', 'block_core_latest_posts_migrate_categories' );