<?php

namespace Tests\Fakes;

use App\Auth\Clock;
use DateTimeImmutable;
use InvalidArgumentException;

class FakeClock implements Clock
{
    public function __construct(
        private DateTimeImmutable $currentTime,
    ) {
        $this->assertUtc($currentTime);
    }

    public function now(): DateTimeImmutable
    {
        return $this->currentTime;
    }

    public function setTime(DateTimeImmutable $newTime): void
    {
        $this->assertUtc($newTime);
        $this->currentTime = $newTime;
    }

    private function assertUtc(DateTimeImmutable $time): void
    {
        if ($time->getTimezone()->getOffset($time) !== 0) {
            throw new InvalidArgumentException(
                'FakeClock requires a DateTimeImmutable in UTC.'
            );
        }
    }
}