MasterClass/application/models/Event_wait_list_deregistration_model.php

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Event_wait_list_deregistration_model extends CI_Model {

	public function __construct() {
        parent::__construct();
		$this->load->model("user_activity_log_model");
    }

    public function deregister_waitlist($cancellation, $update_status = true)
    {
    	$deregisteredWLSubcriber = false;

    	// Get number of reserved seats
		$reserved_seats = $this->db->select('wait_list_id, number_of_places')
			->from('event_wait_list')
			->where('event_id', $cancellation['event_id'])
			->where('wait_list_subscriber', $cancellation['user_id'])
			->where('status', 1)
			->get()
			->row();

		$deregStatus = 1;
		if($reserved_seats->number_of_places == $cancellation['seats_cancelled']){
			$deregStatus = 0;
		}

		// Change subscriber status
		 $this->db->query("
          UPDATE event_wait_list
          SET number_of_places = (CASE
            WHEN (number_of_places - ?) <= 0 THEN 0
            ELSE (number_of_places- ?)
            END),
            status = ?
         WHERE event_schedule_id =?
         AND wait_list_subscriber = ?
          AND status =1",
          array($cancellation['seats_cancelled'], $cancellation['seats_cancelled'], $deregStatus,  $cancellation['event_schedule_id'], $cancellation['user_id']));

		$this->db->insert('event_wait_list_deregistration',
            array(
                'wait_list_id' => $reserved_seats->wait_list_id,
                'event_schedule_id' => $cancellation['event_schedule_id'],
                'wait_list_subscriber' => $cancellation['user_id'],
                // 'seats_reserve' => $cancellation['seats_cancelled'],
                'seats_reserve' => $reserved_seats->number_of_places,
                'number_of_place' => $cancellation['seats_cancelled'],
                'user_agent' => $cancellation['user_agent']
            )
        );

		//get the deregistration id
		$deregisteredWLSubcriber = $this->db->insert_id();

		// Cancel Guests
		// $this->db->where('inviter_id', $cancellation['user_id']);
		// $this->db->where('event_schedule_id', $cancellation['event_schedule_id']);
		// $this->db->update('event_subscriber_guest', array('status' => 0));

        if ($update_status) {
            // Free reserved seats from taken seats
    		$freed_seats = 'quota_waiting_list_seat+'.$cancellation['seats_cancelled'];

    		$this->db->set('quota_waiting_list_seat', $freed_seats, FALSE);
    		$this->db->where('event_schedule_id', $cancellation['event_schedule_id']);
    		$this->db->update('event_schedule');

    		// Update event_status
    		$check_seats = $this->db->select('quota_waiting_list_seat')
    			->from('event_schedule')
    			->where('event_schedule_id', $cancellation['event_schedule_id'])
    			->limit(1)
    			->get()
    			->row();

    		$current_remaining_seats = $this->get_remaining_seats($cancellation['event_id'], $cancellation['event_schedule_id']);

    		if($current_remaining_seats > 0){

    			if(!empty($cancellation['seat_feature']) && $cancellation['seat_feature']==1){
    				//single date
    				$this->db->where('event_schedule_id', $cancellation['event_schedule_id']);
                    $this->db->where('auto_event_status', 1);
    			} else if(!empty($cancellation['seat_feature']) && $cancellation['seat_feature']==2){

    				//combined date
    				$this->db->where('event_id', $cancellation['event_id']);
    				$this->db->where('auto_event_status', 1);
    			}
    			$this->db->update('event_schedule', array('event_status' => "AVAILABLE", 'back_office_status' => 2));

    			$event_schedule_id = $cancellation['event_schedule_id'];
    			$log_desc = "User {$cancellation['user_id']} cancelled subscription. The event schedule is reopened for normal registration. Event status changed from Full to Available.";
    			$act_log = $this->user_activity_log_model->add_activity_log(array(
    				"description" => $log_desc." - event_schedule_id : ".$this->db->escape($event_schedule_id),
    				"user_id"   =>  $_SESSION["logged_in"]["user_id"],
    				"action"    =>  "EDIT",
    				"table_origin" => "event_schedule",
    				"reference_id" => $event_schedule_id
    			));
    		} else if($check_seats->quota_waiting_list_seat > 0){

    			$this->db->where('event_schedule_id', $cancellation['event_schedule_id']);
    			$this->db->update('event_schedule', array('event_status' => "FULL", 'back_office_status' => 2));

    			$event_schedule_id = $cancellation['event_schedule_id'];
    			$log_desc = "User {$cancellation['user_id']} cancelled subscription. The event schedule is reopened for waitlist registration. Backoffice status changed from locked to open.";
    			$act_log = $this->user_activity_log_model->add_activity_log(array(
    				"description" => $log_desc." - event_schedule_id : ".$this->db->escape($event_schedule_id),
    				"user_id"   =>  $_SESSION["logged_in"]["user_id"],
    				"action"    =>  "EDIT",
    				"table_origin" => "event_schedule",
    				"reference_id" => $event_schedule_id
    			));
    		}
        }

		// Update event concurrent process
        $this->db->set('process_status', 0);
        $this->db->where('login_id', $cancellation['login_id']);
        $this->db->where('process_type', $cancellation['process_type']);
        $this->db->update('event_concurrent_process');

        return $deregisteredWLSubcriber;
    }

    private function get_remaining_seats($event_id, $event_schedule_id){

    	$query = $this->db->query("select
    		(CASE
                WHEN e.seat_feature = 2 THEN e.remaining_combined_seat
                ELSE es.remaining_seat
            END) as remaining_seat
         from event_schedule es
         left join event e ON e.event_id = es.event_id
         where e.status = 1
         and es.event_id = ?
         and es.event_schedule_id = ?
         limit 1
        ", array($event_id, $event_schedule_id));
        $row = $query->row();

        if($row){
        	return $row->remaining_seat;
    	}return 0;
    }

}