smartemailing/types

<?php

declare(strict_types = 1);

namespace SmartEmailing\Types;

use Nette\Utils\Strings;
use SmartEmailing\Types\Comparable\ComparableInterface;
use SmartEmailing\Types\Comparable\StringComparableTrait;
use SmartEmailing\Types\ExtractableTraits\StringExtractableTrait;

final class DomainName implements ToStringInterface, ComparableInterface
{

    use StringExtractableTrait;
    use ToStringTrait;
    use StringComparableTrait;

    private string $value;

    private function __construct(
        string $value
    )
    {
        $value = Strings::lower($value);
        $value = Strings::trim($value);

        if (!$this->isValid($value)) {
            throw new InvalidTypeException('Invalid domain: ' . $value);
        }

        $this->value = $value;
    }

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

    public function getSecondLevelDomain(): DomainName
    {
        $parts = \explode('.', $this->value);
        $numberOfKeptParts = 2;

        if (\count($parts) > 2 && \end($parts) === 'uk') {
            $numberOfKeptParts = 3;
        }

        $secondLevelParts = \array_slice($parts, -$numberOfKeptParts, $numberOfKeptParts);

        return self::from(\implode('.', $secondLevelParts));
    }

    private function isValid(
        string $value
    ): bool {
        return \preg_match('/^([_a-z\\d](-*[_a-z\\d])*)(\\.([_a-z\\d](-*[_a-z\\d])*))*$/i', $value) //valid chars check
            && \preg_match('/^.{1,253}$/', $value)// overall length check
            && \preg_match('/^[^\\.]{1,63}(\\.[^\\.]{1,63})*$/', $value);
    }

}