1<?php
  2/**
  3 * Server-side rendering of the `core/calendar` block.
  4 *
  5 * @package WordPress
  6 */
  7
  8/**
  9 * Renders the `core/calendar` block on server.
 10 *
 11 * @since 5.2.0
 12 *
 13 * @global int $monthnum.
 14 * @global int $year.
 15 *
 16 * @param array $attributes The block attributes.
 17 *
 18 * @return string Returns the block content.
 19 */
 20function render_block_core_calendar( $attributes ) {
 21	global $monthnum, $year;
 22
 23	// Calendar shouldn't be rendered
 24	// when there are no published posts on the site.
 25	if ( ! block_core_calendar_has_published_posts() ) {
 26		if ( is_user_logged_in() ) {
 27			return '<div>' . __( 'The calendar block is hidden because there are no published posts.' ) . '</div>';
 28		}
 29		return '';
 30	}
 31
 32	$previous_monthnum = $monthnum;
 33	$previous_year     = $year;
 34
 35	if ( isset( $attributes['month'] ) && isset( $attributes['year'] ) ) {
 36		$permalink_structure = get_option( 'permalink_structure' );
 37		if (
 38			str_contains( $permalink_structure, '%monthnum%' ) &&
 39			str_contains( $permalink_structure, '%year%' )
 40		) {
 41			$monthnum = $attributes['month'];
 42			$year     = $attributes['year'];
 43		}
 44	}
 45
 46	$color_block_styles = array();
 47
 48	// Text color.
 49	$preset_text_color          = array_key_exists( 'textColor', $attributes ) ? "var:preset|color|{$attributes['textColor']}" : null;
 50	$custom_text_color          = $attributes['style']['color']['text'] ?? null;
 51	$color_block_styles['text'] = $preset_text_color ? $preset_text_color : $custom_text_color;
 52
 53	// Background Color.
 54	$preset_background_color          = array_key_exists( 'backgroundColor', $attributes ) ? "var:preset|color|{$attributes['backgroundColor']}" : null;
 55	$custom_background_color          = $attributes['style']['color']['background'] ?? null;
 56	$color_block_styles['background'] = $preset_background_color ? $preset_background_color : $custom_background_color;
 57
 58	// Generate color styles and classes.
 59	$styles        = wp_style_engine_get_styles( array( 'color' => $color_block_styles ), array( 'convert_vars_to_classnames' => true ) );
 60	$inline_styles = empty( $styles['css'] ) ? '' : sprintf( ' style="%s"', esc_attr( $styles['css'] ) );
 61	$classnames    = empty( $styles['classnames'] ) ? '' : ' ' . esc_attr( $styles['classnames'] );
 62	if ( isset( $attributes['style']['elements']['link']['color']['text'] ) ) {
 63		$classnames .= ' has-link-color';
 64	}
 65	// Apply color classes and styles to the calendar.
 66	$calendar = str_replace( '<table', '<table' . $inline_styles, get_calendar( true, false ) );
 67	$calendar = str_replace( 'class="wp-calendar-table', 'class="wp-calendar-table' . $classnames, $calendar );
 68
 69	$wrapper_attributes = get_block_wrapper_attributes();
 70	$output             = sprintf(
 71		'<div %1$s>%2$s</div>',
 72		$wrapper_attributes,
 73		$calendar
 74	);
 75
 76	$monthnum = $previous_monthnum;
 77	$year     = $previous_year;
 78
 79	return $output;
 80}
 81
 82/**
 83 * Registers the `core/calendar` block on server.
 84 *
 85 * @since 5.2.0
 86 */
 87function register_block_core_calendar() {
 88	register_block_type_from_metadata(
 89		__DIR__ . '/calendar',
 90		array(
 91			'render_callback' => 'render_block_core_calendar',
 92		)
 93	);
 94}
 95
 96add_action( 'init', 'register_block_core_calendar' );
 97
 98/**
 99 * Returns whether or not there are any published posts.
100 *
101 * Used to hide the calendar block when there are no published posts.
102 * This compensates for a known Core bug: https://core.trac.wordpress.org/ticket/12016
103 *
104 * @since 5.9.0
105 *
106 * @return bool Has any published posts or not.
107 */
108function block_core_calendar_has_published_posts() {
109	// Multisite already has an option that stores the count of the published posts.
110	// Let's use that for multisites.
111	if ( is_multisite() ) {
112		return 0 < (int) get_option( 'post_count' );
113	}
114
115	// On single sites we try our own cached option first.
116	$has_published_posts = get_option( 'wp_calendar_block_has_published_posts', null );
117	if ( null !== $has_published_posts ) {
118		return (bool) $has_published_posts;
119	}
120
121	// No cache hit, let's update the cache and return the cached value.
122	return block_core_calendar_update_has_published_posts();
123}
124
125/**
126 * Queries the database for any published post and saves
127 * a flag whether any published post exists or not.
128 *
129 * @since 5.9.0
130 *
131 * @global wpdb $wpdb WordPress database abstraction object.
132 *
133 * @return bool Has any published posts or not.
134 */
135function block_core_calendar_update_has_published_posts() {
136	global $wpdb;
137	$has_published_posts = (bool) $wpdb->get_var( "SELECT 1 as test FROM {$wpdb->posts} WHERE post_type = 'post' AND post_status = 'publish' LIMIT 1" );
138	update_option( 'wp_calendar_block_has_published_posts', $has_published_posts );
139	return $has_published_posts;
140}
141
142// We only want to register these functions and actions when
143// we are on single sites. On multi sites we use `post_count` option.
144if ( ! is_multisite() ) {
145	/**
146	 * Handler for updating the has published posts flag when a post is deleted.
147	 *
148	 * @since 5.9.0
149	 *
150	 * @param int $post_id Deleted post ID.
151	 */
152	function block_core_calendar_update_has_published_post_on_delete( $post_id ) {
153		$post = get_post( $post_id );
154
155		if ( ! $post || 'publish' !== $post->post_status || 'post' !== $post->post_type ) {
156			return;
157		}
158
159		block_core_calendar_update_has_published_posts();
160	}
161
162	/**
163	 * Handler for updating the has published posts flag when a post status changes.
164	 *
165	 * @since 5.9.0
166	 *
167	 * @param string  $new_status The status the post is changing to.
168	 * @param string  $old_status The status the post is changing from.
169	 * @param WP_Post $post       Post object.
170	 */
171	function block_core_calendar_update_has_published_post_on_transition_post_status( $new_status, $old_status, $post ) {
172		if ( $new_status === $old_status ) {
173			return;
174		}
175
176		if ( 'post' !== get_post_type( $post ) ) {
177			return;
178		}
179
180		if ( 'publish' !== $new_status && 'publish' !== $old_status ) {
181			return;
182		}
183
184		block_core_calendar_update_has_published_posts();
185	}
186
187	add_action( 'delete_post', 'block_core_calendar_update_has_published_post_on_delete' );
188	add_action( 'transition_post_status', 'block_core_calendar_update_has_published_post_on_transition_post_status', 10, 3 );
189}
190