<?php declare(strict_types=1);
/*
 * This file is part of PHPUnit.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace PHPUnit\Event\Telemetry;

use function sprintf;
use PHPUnit\Event\InvalidArgumentException;

/**
 * @psalm-immutable
 *
 * @no-named-arguments Parameter names are not covered by the backward compatibility promise for PHPUnit
 */
final class HRTime
{
    private readonly int $seconds;
    private readonly int $nanoseconds;

    /**
     * @throws InvalidArgumentException
     */
    public static function fromSecondsAndNanoseconds(int $seconds, int $nanoseconds): self
    {
        return new self(
            $seconds,
            $nanoseconds
        );
    }

    /**
     * @throws InvalidArgumentException
     */
    private function __construct(int $seconds, int $nanoseconds)
    {
        $this->ensureNotNegative($seconds, 'seconds');
        $this->ensureNotNegative($nanoseconds, 'nanoseconds');
        $this->ensureNanoSecondsInRange($nanoseconds);

        $this->seconds     = $seconds;
        $this->nanoseconds = $nanoseconds;
    }

    public function seconds(): int
    {
        return $this->seconds;
    }

    public function nanoseconds(): int
    {
        return $this->nanoseconds;
    }

    /**
     * @throws InvalidArgumentException
     */
    public function duration(self $start): Duration
    {
        $seconds     = $this->seconds - $start->seconds();
        $nanoseconds = $this->nanoseconds - $start->nanoseconds();

        if ($nanoseconds < 0) {
            $seconds--;

            $nanoseconds += 1000000000;
        }

        if ($seconds < 0) {
            throw new InvalidArgumentException('Start needs to be smaller.');
        }

        return Duration::fromSecondsAndNanoseconds(
            $seconds,
            $nanoseconds
        );
    }

    /**
     * @throws InvalidArgumentException
     */
    private function ensureNotNegative(int $value, string $type): void
    {
        if ($value < 0) {
            throw new InvalidArgumentException(
                sprintf(
                    'Value for %s must not be negative.',
                    $type
                )
            );
        }
    }

    /**
     * @throws InvalidArgumentException
     */
    private function ensureNanoSecondsInRange(int $nanoseconds): void
    {
        if ($nanoseconds > 999999999) {
            throw new InvalidArgumentException(
                'Value for nanoseconds must not be greater than 999999999.'
            );
        }
    }
}
