// src/Order/Order.php
class Order
{
    public function __construct(
        private ?int   $id,
        private int    $userId,
        private array  $items, 
        private string $status,
        private bool   $repeated = false,
    ) {}

    public function getId(): ?int      { return $this->id; }
    public function getItems(): array  { return $this->items; }
    public function getStatus(): string { return $this->status; }

    public function resetForRepeat(): void
    {
        $this->id       = null;
        $this->status   = 'draft';
        $this->repeated = false;
    }

    public function markAsRepeated(): void
    {
        $this->repeated = true;
    }

    public function calculateTotal(): int
    {
        return array_sum(array_map(
            fn(OrderItem $i) => $i->getSubtotal(),
            $this->items
        ));
    }
}

// src/Order/OrderItem.php
class OrderItem
{
    public function __construct(
        private int $productId,
        private int $qty,
        private int $price,
    ) {}

    public function getProductId(): int { return $this->productId; }
    public function getQty(): int       { return $this->qty; }
    public function getPrice(): int     { return $this->price; }

    public function getSubtotal(): int
    {
        return $this->qty * $this->price;
    }

    public function applyDiscount(int $percent): void
    {
        $this->price = (int) round(
            $this->price * (1 - $percent / 100)
        );
    }
}

// src/Order/RepeatOrderHandler.php
class RepeatOrderHandler
{
    public function __construct(
        private OrderRepository $orders,
        private PromoService    $promo,
    ) {}

    public function handle(int $originalId, ?string $promoCode): Order
    {
        $original = $this->orders->findById($originalId);

        $copy = clone $original;
        $copy->resetForRepeat();

        if ($promoCode !== null) {
            $discount = $this->promo->resolve($promoCode);

            foreach ($copy->getItems() as $item) {
                $item->applyDiscount($discount->percent);
            }
        }

        $this->orders->save($copy);

        $original->markAsRepeated();
        $this->orders->save($original);

        return $copy;
    }
}

// src/Repository/OrderRepository.php
class OrderRepository
{
    public function __construct(private PDO $pdo) {}

    public function save(Order $order): void
    {
        if ($order->getId() === null) {
            $this->insert($order);
        } else {
            $this->update($order);
        }
    }

    private function update(Order $order): void
    {
        $this->pdo->prepare(
            'UPDATE orders SET status = ?, repeated = ? WHERE id = ?'
        )->execute([$order->getStatus(), (int) $order->isRepeated(), $order->getId()]);

        $this->pdo->prepare('DELETE FROM order_items WHERE order_id = ?')
            ->execute([$order->getId()]);

        foreach ($order->getItems() as $item) {
            $this->pdo->prepare(
                'INSERT INTO order_items (order_id, product_id, qty, price) VALUES (?, ?, ?, ?)'
            )->execute([$order->getId(), $item->getProductId(), $item->getQty(), $item->getPrice()]);
        }
    }
}