<?php

namespace App\Services\Tenant;

use InvalidArgumentException;

final class DomainNormalizer
{
    public function normalize(string $value): string
    {
        $value = trim($value);

        if ($value === '') {
            throw new InvalidArgumentException('A domain is required.');
        }

        $candidate = str_contains($value, '://') ? $value : 'http://'.$value;
        $host = parse_url($candidate, PHP_URL_HOST);

        if (! is_string($host) || $host === '' || str_contains($host, '/')) {
            throw new InvalidArgumentException('Enter a valid hostname, such as book.example.com.');
        }

        $host = strtolower(rtrim($host, '.'));

        if (strlen($host) > 253 || preg_match('/\s/', $host) || ! preg_match('/^[a-z0-9.-]+$/', $host)) {
            throw new InvalidArgumentException('Enter a valid hostname, such as book.example.com.');
        }

        return $host;
    }
}