<?php

declare(strict_types=1);

namespace MiniShop\Invoicing\Domain\Model;

final readonly class InvoiceLine
{
    public function __construct(
        public string $description,
        public int $quantity,
        public int $unitPriceInCents,
        public string $currency,
        public TaxRate $taxRate,
    ) {
        if ($quantity <= 0) {
            throw new \InvalidArgumentException('Quantity must be positive.');
        }
    }

    public function lineTotalExclTax(): int
    {
        return $this->quantity * $this->unitPriceInCents;
    }

    public function lineTotalInclTax(): int
    {
        return (int) round($this->lineTotalExclTax() * (1 + $this->taxRate->rate));
    }
}