<?php

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/**

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

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*

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* @package WordPress

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*/

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/**

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* Renders the `core/calendar` block on server.

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*

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* @since 5.2.0

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*

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* @global int $monthnum.

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* @global int $year.

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*

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* @param array $attributes The block attributes.

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*

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* @return string Returns the block content.

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*/

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function render_block_core_calendar( $attributes ) {

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global $monthnum, $year;

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// Calendar shouldn't be rendered

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// when there are no published posts on the site.

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if ( ! block_core_calendar_has_published_posts() ) {

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if ( is_user_logged_in() ) {

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return '<div>' . __( 'The calendar block is hidden because there are no published posts.' ) . '</div>';

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}

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return '';

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}

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$previous_monthnum = $monthnum;

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$previous_year = $year;

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if ( isset( $attributes['month'] ) && isset( $attributes['year'] ) ) {

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$permalink_structure = get_option( 'permalink_structure' );

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if (

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str_contains( $permalink_structure, '%monthnum%' ) &&

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str_contains( $permalink_structure, '%year%' )

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) {

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$monthnum = $attributes['month'];

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$year = $attributes['year'];

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}

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}

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$color_block_styles = array();

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// Text color.

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$preset_text_color = array_key_exists( 'textColor', $attributes ) ? "var:preset|color|{$attributes['textColor']}" : null;

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$custom_text_color = $attributes['style']['color']['text'] ?? null;

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$color_block_styles['text'] = $preset_text_color ? $preset_text_color : $custom_text_color;

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// Background Color.

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$preset_background_color = array_key_exists( 'backgroundColor', $attributes ) ? "var:preset|color|{$attributes['backgroundColor']}" : null;

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$custom_background_color = $attributes['style']['color']['background'] ?? null;

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$color_block_styles['background'] = $preset_background_color ? $preset_background_color : $custom_background_color;

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// Generate color styles and classes.

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$styles = wp_style_engine_get_styles( array( 'color' => $color_block_styles ), array( 'convert_vars_to_classnames' => true ) );

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$inline_styles = empty( $styles['css'] ) ? '' : sprintf( ' style="%s"', esc_attr( $styles['css'] ) );

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$classnames = empty( $styles['classnames'] ) ? '' : ' ' . esc_attr( $styles['classnames'] );

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if ( isset( $attributes['style']['elements']['link']['color']['text'] ) ) {

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$classnames .= ' has-link-color';

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}

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// Apply color classes and styles to the calendar.

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$calendar = str_replace( '<table', '<table' . $inline_styles, get_calendar( true, false ) );

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$calendar = str_replace( 'class="wp-calendar-table', 'class="wp-calendar-table' . $classnames, $calendar );

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$wrapper_attributes = get_block_wrapper_attributes();

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$output = sprintf(

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'<div %1$s>%2$s</div>',

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$wrapper_attributes,

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$calendar

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);

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$monthnum = $previous_monthnum;

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$year = $previous_year;

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return $output;

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}

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/**

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* Registers the `core/calendar` block on server.

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*

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* @since 5.2.0

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*/

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function register_block_core_calendar() {

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register_block_type_from_metadata(

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__DIR__ . '/calendar',

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array(

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'render_callback' => 'render_block_core_calendar',

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)

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);

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}

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add_action( 'init', 'register_block_core_calendar' );

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/**

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* Returns whether or not there are any published posts.

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*

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* Used to hide the calendar block when there are no published posts.

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* This compensates for a known Core bug: https://core.trac.wordpress.org/ticket/12016

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*

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* @since 5.9.0

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*

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* @return bool Has any published posts or not.

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*/

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function block_core_calendar_has_published_posts() {

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// Multisite already has an option that stores the count of the published posts.

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// Let's use that for multisites.

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if ( is_multisite() ) {

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return 0 < (int) get_option( 'post_count' );

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}

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// On single sites we try our own cached option first.

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$has_published_posts = get_option( 'wp_calendar_block_has_published_posts', null );

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if ( null !== $has_published_posts ) {

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return (bool) $has_published_posts;

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}

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// No cache hit, let's update the cache and return the cached value.

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return block_core_calendar_update_has_published_posts();

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}

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/**

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* Queries the database for any published post and saves

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* a flag whether any published post exists or not.

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*

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* @since 5.9.0

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*

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* @global wpdb $wpdb WordPress database abstraction object.

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*

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* @return bool Has any published posts or not.

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*/

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function block_core_calendar_update_has_published_posts() {

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global $wpdb;

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$has_published_posts = (bool) $wpdb->get_var( "SELECT 1 as test FROM {$wpdb->posts} WHERE post_type = 'post' AND post_status = 'publish' LIMIT 1" );

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update_option( 'wp_calendar_block_has_published_posts', $has_published_posts );

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return $has_published_posts;

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}

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// We only want to register these functions and actions when

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// we are on single sites. On multi sites we use `post_count` option.

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if ( ! is_multisite() ) {

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/**

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* Handler for updating the has published posts flag when a post is deleted.

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*

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* @since 5.9.0

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*

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* @param int $post_id Deleted post ID.

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*/

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function block_core_calendar_update_has_published_post_on_delete( $post_id ) {

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$post = get_post( $post_id );

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if ( ! $post || 'publish' !== $post->post_status || 'post' !== $post->post_type ) {

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return;

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}

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block_core_calendar_update_has_published_posts();

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}

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/**

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* Handler for updating the has published posts flag when a post status changes.

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*

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* @since 5.9.0

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*

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* @param string $new_status The status the post is changing to.

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* @param string $old_status The status the post is changing from.

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* @param WP_Post $post Post object.

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*/

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function block_core_calendar_update_has_published_post_on_transition_post_status( $new_status, $old_status, $post ) {

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if ( $new_status === $old_status ) {

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return;

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}

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if ( 'post' !== get_post_type( $post ) ) {

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return;

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}

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if ( 'publish' !== $new_status && 'publish' !== $old_status ) {

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return;

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}

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block_core_calendar_update_has_published_posts();

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}

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add_action( 'delete_post', 'block_core_calendar_update_has_published_post_on_delete' );

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add_action( 'transition_post_status', 'block_core_calendar_update_has_published_post_on_transition_post_status', 10, 3 );

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}

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