[Appointments] - Shows last scheduled user name for unavailable appointment schedule segments.

wpmudev_app-show_scheduled_users.php

<?php
/*
Plugin Name: Show Last User in Calendar
Description: Shows last scheduled user name for unavailable appointment schedule segments.
Plugin URI: http://premium.wpmudev.org/project/appointments-plus/
Version: 1.0
AddonType: Schedule
Author: Panos @ WPMU DEV
*/

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

if ( ! class_exists( 'WPMUDEV_App_Last_Scheduled_User' ) ) {

	class WPMUDEV_App_Last_Scheduled_User {

		private static $_instance = null;
        
        public static function get_instance() {
            if( is_null( self::$_instance ) ){
                self::$_instance = new WPMUDEV_App_Last_Scheduled_User();
            }
            return self::$_instance;
            
        }
        private function __construct() {

        	if( ! function_exists( 'appointments_delete_timetables_cache' ) ){
        		return;
        	}

        	appointments_delete_timetables_cache();
			add_filter( 'app-schedule_cell-title', array( $this, 'process_cell_title' ), 10, 5 );
			add_action( 'wp_footer', array( $this, 'footer_scripts' ), 10 );
			add_action( 'wp_head', array( $this, 'head_styles' ), 10 );
        }

		public function process_cell_title ($title, $is_busy, $start, $end, $schedule_key) {

			if ( ! $is_busy || ! is_user_logged_in() || ! current_user_can( 'manage_options' ) ){
				return $title;
			} 

			$customers = $this->_get_appointments_by_interval($start, $end, $schedule_key);
			if (empty($customers)) return $title;
			$names = join("\n", array_unique(wp_list_pluck($customers, 'name')));
			return $names;
		}

		private function _get_appointments_by_interval ($start, $end, $schedule_key) {

			$apps = $this->_get_appointments_for_scheduled_interval($schedule_key, $start);
			if (!$apps) return false;

			$ret = array();
			$period = new App_Period($start, $end);
			foreach ($apps as $app) {			
				if ($period->contains($app->start, $app->end)) $ret[] = $app;
			}
			return $ret;

		}

		private function _get_appointments_for_scheduled_interval( $schedule_key, $start ) {

			$data = explode( 'x', $schedule_key );
			if ( count( $data ) != 2 ) {
				$interval_start = current_time( 'timestamp' );
				$interval_end   = strtotime( 'next month', $interval_start );
			} else {
				$interval_start = $data[0];
				$interval_end   = $data[1];
			}

			$appointments = appointments();
			$args         = array(
				'status' => array( 'pending', 'paid', 'confirmed', 'reserved' )
			);

			if ( $appointments->service ) {
				$args['service'] = $appointments->service;
			}
			if ( $appointments->worker ) {
				$args['worker'] = $appointments->service;
			}

			$start = date( "Y-m-d H:i:s", $start );
			$args['date_query'] = array(
				array(
					'field' => 'start',
					'compare' => '=',
					'value' => $start
				)
			);

			$args['order'] = 'DESC';
			$args['per_page'] = 1;

			$apps = appointments_get_appointments( $args );
			$res  = array();
			foreach ( $apps as $app ) {
				if ( strtotime( $app->start ) > $interval_start && strtotime( $app->end ) < $interval_end ) {
					$res[] = $app;
				}
			}

			return $res;
		}

		public function footer_scripts(){

			global $post;

			if ( ! has_shortcode( $post->post_content, 'app_monthly_schedule' ) ) {
				return;
			}

			?>
			<script type="text/javascript">
				(function($){
					$(document).ready(function(){
						$( '.app_timetable_cell.busy' ).each(function(){
							const el = $(this);
							let title = el.attr( 'title' );

							if( ! app_isDate( title ) ){								
								el.append( '<div class="app_user">' + title + '</div>' );
							}
						});
					});
				})(jQuery);

				let app_isDate = function(date) {
				    return (new Date(date) !== "Invalid Date") && !isNaN(new Date(date));
				}
			</script>
			<?php

		}

		public function head_styles(){
			global $post;

			if ( ! has_shortcode( $post->post_content, 'app_monthly_schedule' ) ) {
				return;
			}

			?>
			<style type="text/css">
				
				.app_timetable_cell{
					min-height: 45px;
				}

				.app_timetable_cell .app_user{
					overflow: hidden;
					white-space: nowrap;
					text-overflow: ellipsis;
				}
			</style>
			<?php
		}

	}

	add_action( 'plugins_loaded', function(){
        $GLOBALS['WPMUDEV_App_Last_Scheduled_User'] = WPMUDEV_App_Last_Scheduled_User::get_instance();
    }, 10 );
	
}