<?php


namespace App\Services;


use App\Category;
use App\Power;
use PhpParser\Node\Expr\AssignOp\Pow;

class Tree
{
    /**
     * @var array
     */
    private $records;

    public function __construct(array $records)
    {
        $this->records = $records;
    }

    public function build(int $parentId): array
    {
        $powers = Power::all();
        $result = [];
        foreach ($this->records as $record) {
           if(empty($record['descendants'])){
                if(!isset($record['powers'])) {
                    $record['powers'] = [];
                }

                if( isset($record['products']) ){
                    foreach ($record['products'] as $commodity){
                        $power = $powers->where('id', $commodity['power_id'])->first();
                        $record['powers'][] = $power['power'];
                    }
                }


           }
            if ($record['parent_id'] === $parentId) {
                $record['children'] = $this->build($record['id']);
                $result[] = $record;
            }
        }
        return $result;
    }
}