workshop-value-object-or-not-quiz-5

workshop-value-object-or-not-quiz-5.php

readonly class Money
{
    private function __construct(private string $amount, private Currency $currency)
    {}

    public static function eur(string $amount): self
    {
        return new static($amount, Currency::eur());
    }

    public function amount(): string
    {
        return $this->amount;
    }

    public function currency(): Currency
    {
        return $this->currency;
    }

    public function add(Money $other): Money
    {
        if (!$this->currency->equals($other->currency())) {
            throw new InvalidCurrencyException::notEquals($this->currency, $other->currency());
        }

        $sum = bcadd($this->amount, $other->amount(), 2);

        return new self($sum, $this->currency);
    }
    
    public function equals(Money $other): bool
    {
        if (get_class($this) != get_class($other)) {
            return false;
        }
        
        return $this->amount === $other->amount() &&
               $this->currency === $other->currency();
    }
}