Custom routing implementatoin

Browsing through https://doc.nette.org/…tion/routing#… and this is what I have come up with for a simple blog crud.
this code works, but any pointers, tips, improvements here would be welcome.

declare(strict_types=1);

namespace App\Router;

use Nette;
use Nette\Application\Routers\RouteList;


class blogRouter implements Nette\Application\IRouter
{
        public $defaults = [];

        public function __construct(array $defaults = [])
        {
                $this->defaults = $defaults;
        }

       /**
         *
         * @access      public
         * @param       Nette\Http\IRequest     $httpRequest
         * @throws      UI\InvalidLinkException
         * @return      array
         *
         */
        function match(Nette\Http\IRequest $httpRequest): ?array
        {
                $url = $httpRequest->getUrl()->getPathInfo();
                $path = pathinfo( $url );

                $url = $httpRequest->getUrl()->getPathInfo();


                switch( $url )
                {
                        case strstr($url, 'blog/admin/view'):
                        case strstr($url, 'blog/admin/edit'):
                        case strstr($url, 'blog/admin/delete'):
                                $parts = explode( '/', $url );
                                $params = list($presenter, $admin, $action, $id) = $parts;
                                return ['presenter'=>'Blog',
                                        'action'=>$action,
                                        'id' => $id
                                ];

                        case strstr($url, 'blog/admin/add'):
                                return ['presenter'=>'Blog',
                                        'action'=>'add'
                                ];


                        case 'blog/admin':
                                return ['presenter'=>'Blog',
                                        'action'=>'admin',
                                        'id' => null
                                ];

                        case 'blog':
                                return ['presenter'=>'Blog',
                                        'action'=>'default'
                                ];

                        default:
                                throw new UI\InvalidLinkException("Invalid link destination '{$url}'.");

                }
                return null;
        }


        /**
         * @access public
         * @param       array   $params
         * @param       Nette\Http\UrlScript    $refUrl
         * @return      string
         *
         */
        function constructUrl(array $params, Nette\Http\UrlScript $refUrl): ?string
        {
                $auth = $refUrl->getAuthority();
                $scheme = $refUrl->getScheme();
                $action = $params['action'];

                switch( $action )
                {
                        case 'view':
                        case 'edit':
                        case 'delete':
                                $id = $params['id'];
                                return $scheme.'://'.$auth.'/blog/admin/'.$action.'/'.$id;

                        case 'add':
                                return $scheme.'://'.$auth.'/blog/admin/add';

                        case 'admin':
                                return $scheme.'://'.$auth.'/blog/admin';

                        default:
                                return $scheme.'://'.$auth.'/blog';
                }
        }
}