<?php

namespace IpSupply\Prology\Helper;

class CategoryHelper
{

    protected $dir;
    protected $objectManager;

    public function __construct(
        \Magento\Framework\Filesystem\DirectoryList $dir,
    ) {
        $this->dir = $dir;
        $this->objectManager = \Magento\Framework\App\ObjectManager::getInstance();
    }

    public function getAllCategories() {
        $categories = $this->objectManager->Create('\Magento\Catalog\Model\ResourceModel\Category\Collection')
                   ->addAttributeToSelect('*')
                   ->addAttributeToSort('path', 'asc');
        $data = [];
        foreach($categories as $category){
            $cat = array(
                "id" => $category->getId(),
                "parentId" => $category->getParentId(),
                "name" => $category->getName()
            );
            $data[] = $cat;
        }
        $menu = [];
        $this->createMenu($menu, $data, 2);
        return array(
            "data" => $data,
            "menu" => $menu
        );
    }

    function createMenu(&$result,$data, $parentId){
        foreach ($data as $value) {
            if ($value["parentId"] == $parentId) {
                $value["child"] = array();
                $child = &$value["child"];
                array_push($result,$value);
                $this->createMenu($child, $data, $value["id"]);

            }
        }
    }

}