<?php

namespace KupShop\KupShopBundle\Template;

use Doctrine\Common\Collections\ArrayCollection;

trait CachingWrapperTrait
{
    protected $cached_values = [];

    public function __clone()
    {
        $this->cached_values = [];
    }

    /**
     * @return bool
     */
    protected function getCachedValue(&$value)
    {
        $field = $this->getCachedFieldName();

        if (array_key_exists($field, $this->cached_values)) {
            $value = $this->cached_values[$field];

            return true;
        }

        return false;
    }

    protected function setCachedValue(&$value)
    {
        $field = $this->getCachedFieldName();
        $this->cached_values[$field] = $value;
    }

    protected function getCachedFieldName()
    {
        $function = @debug_backtrace()[2]['function'];

        if (strpos($function, 'field_') !== 0) {
            throw new \Exception('Cannot get cached field name');
        }

        return substr($function, 6);
    }

    protected function jsonSerializeObject()
    {
        $data = parent::jsonSerializeObject();

        foreach ($this->cached_values as $key => $value) {
            if ($value instanceof ArrayCollection) {
                $data[$key] = $value->toArray();
                continue;
            }

            $data[$key] = $value;
        }

        return $data;
    }
}