<?php

namespace App\Altcha;

use App\Altcha\Form\AltchaModel;
use Symfony\Component\Form\DataTransformerInterface;

class AltchaTransformer implements DataTransformerInterface
{
    /**
     * {@inheritDoc}
     */
    public function reverseTransform($value): AltchaModel
    {
        if (empty($value)) {
            return new AltchaModel();
        }

        $decodedValue = base64_decode($value);
        $data = json_decode($decodedValue);

        $model = new AltchaModel();

        foreach ($data as $property => $value) {
            $model->{$property} = $value;
        }

        return $model;
    }

    /**
     * {@inheritDoc}
     */
    public function transform($value): string
    {
        if (empty($value)) {
            return '';
        }

        $json = json_encode($value);

        if (false === $json) {
            return '';
        }

        return base64_encode($json);
    }
}