ItemAddedToCart

 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 ItemAddedToCart extends Event
10{
11    public static int $item_limit = 2;
12 
13    public static int $hold_seconds = 5;
14 
15    public ItemState $item;
16 
17    public CartState $cart;
18 
19    public int $quantity;
20 
21    public function validate()
22    {
23        $this->assert(! $this->cart->checked_out, 'Already checked out');
24 
25        $this->assert(
26            $this->item->available() >= $this->quantity,
27            'Out of stock',
28        );
29 
30        $this->assert(
31            $this->cart->count($this->item->id) + $this->quantity <= self::$item_limit,
32            'Reached limit'
33        );
34    }
35 
36    public function apply()
37    {
38        // Add (additional?) quantity to cart
39        $this->cart->items[$this->item->id] = $this->cart->count($this->item->id) + $this->quantity;
40 
41        // Initialize hold to 0 if it doesn't already exist
42        $this->item->holds[$this->cart->id] ??= [
43            'quantity' => 0,
44            'expires' => now()->unix() + self::$hold_seconds,
45        ];
46 
47        // Add quantity to hold
48        $this->item->holds[$this->cart->id]['quantity'] += $this->quantity;
49    }
50}