<?php
class OrderService
{
    private $itemService;

    public function __construct(ItemService $itemService)
    {
        $this->itemService = $itemService;
    }

    public function create(OrderCreationDto $context)
    {
        $order = new Order();
        $order->setCustomerId($context->customerId);
        $order->setPartnerId($context->partnerId);
        $order->setDeliveryAddress(new Address($context->address));
        $order->addItems($this->createOrderItems($context->products));
        return $order;
    }

    private function createOrderItems(array $products)
    {
        return array_map(function (array $product) {
            $item = $this->itemService->create($product->id, $product->price);
            $orderItem = new OrderItem();
            $orderItem->setItemId($item->getId());
            $orderItem->setProductId($product->id);
            return $orderItem;
        }, $products);
    }
}