CheckedOut

 1<?php ...
 2 
 3namespace Thunk\Verbs\Examples\Cart\Events;
 4 
 5use Thunk\Verbs\Event;
 6use Thunk\Verbs\Examples\Cart\States\CartState;
 7use Thunk\Verbs\Examples\Cart\States\ItemState; 
 8 
 9class CheckedOut extends Event
10{
11    public CartState $cart;
12 
13    public function validate()
14    {
15        $this->assert(! $this->cart->checked_out, 'Already checked out');
16 
17        foreach ($this->cart->items as $item_id => $quantity) {
18            $item = ItemState::load($item_id);
19            $held = $item->activeHolds()[$this->cart->id]['quantity'] ?? 0;
20            $this->assert($held + $item->available() >= $quantity, 'Some items in your cart are out of stock');
21        }
22    }
23 
24    public function apply()
25    {
26        foreach ($this->cart->items as $item_id => $quantity) {
27            $item = ItemState::load($item_id);
28            $item->quantity -= $quantity;
29            unset($item->holds[$this->cart->id]);
30        }
31 
32        $this->cart->checked_out = true;
33    }
34}