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1<?php
2
3declare(strict_types=1);
4
5namespace App\Shared\Domain\ValueObject;
6
7use InvalidArgumentException;
8
9/**
10 * Monetary amount stored in minor units (e.g. cents) to avoid float rounding.
11 */
12final class Money
13{
14    public function __construct(
15        private readonly int $amount,
16        private readonly Currency $currency,
17    ) {
18    }
19
20    public function amount(): int
21    {
22        return $this->amount;
23    }
24
25    public function currency(): Currency
26    {
27        return $this->currency;
28    }
29
30    public function add(self $other): self
31    {
32        $this->assertSameCurrency($other);
33
34        return new self($this->amount + $other->amount, $this->currency);
35    }
36
37    public function equals(self $other): bool
38    {
39        return $this->amount === $other->amount && $this->currency->equals($other->currency);
40    }
41
42    private function assertSameCurrency(self $other): void
43    {
44        if (!$this->currency->equals($other->currency)) {
45            throw new InvalidArgumentException(sprintf('Cannot operate on different currencies <%s> and <%s>.', $this->currency, $other->currency));
46        }
47    }
48}