<?php

/**
 * Chill is a software for social workers
 *
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

declare(strict_types=1);

namespace Chill\DocStoreBundle\Service;

use Base64Url\Base64Url;
use ChampsLibres\AsyncUploaderBundle\TempUrl\TempUrlGeneratorInterface;
use Chill\DocStoreBundle\Entity\StoredObject;
use Chill\DocStoreBundle\Exception\StoredObjectManagerException;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Contracts\HttpClient\Exception\TransportExceptionInterface;
use Symfony\Contracts\HttpClient\HttpClientInterface;
use Throwable;

use const OPENSSL_RAW_DATA;

final class StoredObjectManager implements StoredObjectManagerInterface
{
    private const ALGORITHM = 'AES-256-CBC';

    private HttpClientInterface $client;

    private TempUrlGeneratorInterface $tempUrlGenerator;

    public function __construct(
        HttpClientInterface $client,
        TempUrlGeneratorInterface $tempUrlGenerator
    ) {
        $this->client = $client;
        $this->tempUrlGenerator = $tempUrlGenerator;
    }

    public function read(StoredObject $document): string
    {
        try {
            $response = $this
                ->client
                ->request(
                    Request::METHOD_GET,
                    $this
                        ->tempUrlGenerator
                        ->generate(
                            Request::METHOD_GET,
                            $document->getFilename()
                        )
                        ->url
                );
        } catch (Throwable $e) {
            throw StoredObjectManagerException::errorDuringHttpRequest($e);
        }

        if ($response->getStatusCode() !== Response::HTTP_OK) {
            throw StoredObjectManagerException::invalidStatusCode($response->getStatusCode());
        }

        try {
            $data = $response->getContent();
        } catch (Throwable $e) {
            throw StoredObjectManagerException::unableToGetResponseContent($e);
        }

        if (false === $this->hasKeysAndIv($document)) {
            return $data;
        }

        $clearData = openssl_decrypt(
            $data,
            self::ALGORITHM,
            // TODO: Why using this library and not use base64_decode() ?
            Base64Url::decode($document->getKeyInfos()['k']),
            OPENSSL_RAW_DATA,
            pack('C*', ...$document->getIv())
        );

        if (false === $clearData) {
            throw StoredObjectManagerException::unableToDecrypt(openssl_error_string());
        }

        return $clearData;
    }

    public function write(StoredObject $document, string $clearContent): void
    {
        $encryptedContent = $this->hasKeysAndIv($document)
            ? openssl_encrypt(
                $clearContent,
                self::ALGORITHM,
                // TODO: Why using this library and not use base64_decode() ?
                Base64Url::decode($document->getKeyInfos()['k']),
                OPENSSL_RAW_DATA,
                pack('C*', ...$document->getIv())
            )
            : $clearContent;

        try {
            $response = $this
                ->client
                ->request(
                    Request::METHOD_PUT,
                    $this
                        ->tempUrlGenerator
                        ->generate(
                            Request::METHOD_PUT,
                            $document->getFilename()
                        )
                        ->url,
                    [
                        'body' => $encryptedContent,
                    ]
                );
        } catch (TransportExceptionInterface $exception) {
            throw StoredObjectManagerException::errorDuringHttpRequest($exception);
        }

        if ($response->getStatusCode() !== Response::HTTP_CREATED) {
            throw StoredObjectManagerException::invalidStatusCode($response->getStatusCode());
        }
    }

    private function hasKeysAndIv(StoredObject $storedObject): bool
    {
        return ([] !== $storedObject->getKeyInfos()) && ([] !== $storedObject->getIv());
    }
}