<?php

/*
 * Copyright (C) 2015 IRSTEA
 * All rights reserved.
 */

namespace Irstea\FileUploadBundle\Form\DataTranformer;

use Irstea\FileUploadBundle\Entity\UploadedFile;
use Irstea\FileUploadBundle\Service\FileManagerInterface;
use Rhumsaa\Uuid\Uuid;
use Symfony\Component\Form\DataTransformerInterface;
use Symfony\Component\Form\Exception\TransformationFailedException;

/**
 * Description of UploadedFileTransformer
 */
class UploadedFileTransformer implements DataTransformerInterface
{
    /**
     *
     * @var boolean
     */
    private $multiple;

    /**
     *
     * @var FileManagerInterface
     */
    private $fileManager;

    public function __construct(FileManagerInterface $fileManager, $multiple = false)
    {
        $this->fileManager = $fileManager;
        $this->multiple = $multiple;
    }

    /**
     * {@inheritdoc}
     */
    public function reverseTransform($value)
    {
        if(!$this->multiple) {
            return $this->reverseTransformFile($value);
        }

        if(null === $value || '' === $value) {
            return [];
        }

        if(!is_array($value) && !$value instanceof \Traversable) {
            throw new TransformationFailedException('Expected an array or a \Traversable.');
        }

        $result = [];
        foreach($value as $index => $identifier) {
            if(null !== $file = $this->reverseTransformFile($identifier)) {
                $result[$index] = $file;
            }
        }
        return $result;
    }

    /**
     * {@inheritdoc}
     */
    public function transform($value)
    {
        if(!$this->multiple) {
            return $this->transformFile($value);
        }

        if(empty($value)) {
            return [];
        }

        if(!is_array($value) && !$value instanceof \Traversable) {
            throw new TransformationFailedException('Expected an array or a \Traversable.');
        }

        $result = [];
        foreach($value as $index => $file) {
            if(null !== $item = $this->transformFile($file)) {
                $result[$index] = $item;
            }
        }
        return $result;
    }

    /**
     *
     * @param mixed $value
     * @return mixed
     */
    protected function transformFile($value)
    {
        if(null === $value) {
            return null;
        }

        if(!$value instanceof UploadedFile) {
            throw new TransformationFailedException('Expected an UploadedFile.');
        }

        return $value;
    }

    /**
     *
     * @param mixed $value
     * @return UploadedFile
     */
    protected function reverseTransformFile($value)
    {
        if(is_string($value) && Uuid::isValid($value)) {
            $value = $this->fileManager->get($value);
        }

        if(null === $value || '' === $value) {
            return null;
        }

        if($value instanceof UploadedFile) {
            if($value->isOrphelin()) {
                $value->setEtat(UploadedFile::ETAT_NORMAL);
            }
            return $value;
        }

        throw new TransformationFailedException('Expected an UploadedFile or a valid file UUID.');
    }
}