<?php

declare(strict_types=1);

namespace App\Services;

use Illuminate\Support\Uri;
use InvalidArgumentException;

class UrlService
{
    public function host(string $url): string
    {
        $uri = Uri::of($url);

        $scheme = $uri->scheme();
        if ($scheme === null || $scheme === '') {
            throw new InvalidArgumentException("URL has no scheme: {$url}");
        }
        if (! in_array($scheme, ['http', 'https'], true)) {
            throw new InvalidArgumentException("Invalid URL scheme: {$scheme}");
        }

        if ($uri->user() !== null) {
            throw new InvalidArgumentException("URLs with embedded credentials not allowed: {$url}");
        }

        $host = $uri->host();
        if ($host === null || $host === '') {
            throw new InvalidArgumentException("URL has no host: {$url}");
        }

        $bareHost = preg_replace('/%.*$/', '', trim($host, '[]'));
        if (filter_var($bareHost, FILTER_VALIDATE_IP) !== false) {
            throw new InvalidArgumentException("IP literal hosts not allowed: {$host}");
        }

        return mb_strtolower($host);
    }
}