[Appointment+] - Show Scheduled Users Extended. Extend existing functionality of Show Scheduled Users to show users names on time slots

wpmudev-appointments-users-slots.php

<?php
/**
* Plugin Name: [Appointment+] - Show Scheduled Users Extended
* Plugin URI: https://premium.wpmudev.org/
* Description: Extend existing functionality of Show Scheduled Users to show users names on time slots
* Author: Alessandro Kaounas @ WPMUDEV
* Author URI: https://premium.wpmudev.org/
* License: GPLv2 or later
*/

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

if ( ! class_exists( 'WPMUDEV_Appointments_Scheduled_Users' ) ) {
    
    class WPMUDEV_Appointments_Scheduled_Users {

        private static $_instance = null;

        public static function get_instance() {

            if( is_null( self::$_instance ) ){
                self::$_instance = new WPMUDEV_Appointments_Scheduled_Users();
            }
            return self::$_instance;
            
        }

        private function __construct() {
            add_filter( 'app-schedule_cell-title', array( $this, 'appointments_scheduled_users' ), 20, 5 );
        }
	
		function appointments_scheduled_users($title, $is_busy, $start, $end, $schedule_key){
            
            // This has to be checked out
            // if (!$is_busy) return $title;
            
            $customers = $this->_get_appointments_by_interval($start, $end, $schedule_key);
            
            if (empty($customers)) return $title;
            $names = join(" - ", array_unique(wp_list_pluck($customers, 'name')));
            return $names;

        }
        
        private function _get_appointments_by_interval ($start, $end, $schedule_key) {
            $apps = wp_cache_get('app-show_users-' . $schedule_key);
            if (!$apps) $apps = $this->_get_appointments_for_scheduled_interval($schedule_key);
            if (!$apps) return false;
    
            $ret = array();
            $period = new App_Period($start, $end);
            foreach ($apps as $app) {
                //if (mysql2date('U',$app->start) >= $start && mysql2date('U',$app->end) <= $end) $ret[] = $app;
                if ($period->contains($app->start, $app->end)) $ret[] = $app;
            }
            return $ret;
        }
    
        private function _get_appointments_for_scheduled_interval( $schedule_key ) {
            $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;
            }
    
            $apps = appointments_get_appointments( $args );
            $res  = array();
            foreach ( $apps as $app ) {
                if ( strtotime( $app->start ) > $interval_start && strtotime( $app->end ) < $interval_end ) {
                    $res[] = $app;
                }
            }
    
            wp_cache_set( 'app-show_users-' . $schedule_key, $res );
    
            return $res;
        }

	}
	
    if ( ! function_exists( 'wpmudev_appointments_scheduled_users' ) ) {
        
        function wpmudev_appointments_scheduled_users() {
            return WPMUDEV_Appointments_Scheduled_Users::get_instance();
        };

        add_action( 'plugins_loaded', 'wpmudev_appointments_scheduled_users', 99 );
    }

}