DirectoriesFormatter.php

<?php

namespace App\Helpers;

use Illuminate\Support\Facades\Storage;

class DirectoriesFormatter
{
    /** @var string */
    private $root;

    public function __construct(string $root)
    {
        $this->root = $root;
    }

    private function getDirectoryName($directory)
    {
        $separator = $directory ? explode('/', $directory) : null;
        return $separator ? $separator[count($separator)-1] : null;
    }

    private function getSubDirectories($directory)
    {
        $subdirectorios = Storage::directories($directory);
        $recursiveMapped = array_map(function ($directory) { 
            return new Entities\Directory($this->getDirectoryName($directory), $this->getSubDirectories($directory)); 
        }, $subdirectorios);
        return $recursiveMapped;
    }

    public function listDirectories()
    {
        $subdirectorios = $this->getSubDirectories($this->root);
        $directorioRoot = new Entities\Directory($this->root, $subdirectorios);

        return $directorioRoot->toArray();
    }
}