<?php

namespace ExtraDataBundle\Entity\Traits;

trait ExtraDataWithParentTrait
{
    
    use ExtraDataTrait;

    /**
     * @param string $extraData
     * 
     * @return $this
     */
    public function setExtraData($extraData = null)
    {
        $this->extraData = $this->extraDataDiff($extraData);
        
        return $this;
    }
    
    /**
     * @param string $extraData
     * 
     * @return string
     */
    public function extraDataDiff($extraData = null)
    {
        $parentExtraData = array();
        if (!is_null($this->parent)) {
            $parentExtraData = json_decode($this->parent->getExtraData(), true);
        }
        
        $extraDataArray = json_decode($extraData, true);
        if (json_last_error() === JSON_ERROR_NONE) {
            return json_encode(array_diff($extraDataArray, $parentExtraData));
        }
        
        return $extraData;
    }
    
}