<?php

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

namespace Irstea\FileUploadBundle\Controller;

use Irstea\FileUploadBundle\Entity\UploadedFile;
use Irstea\FileUploadBundle\Service\FileManagerInterface;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Method;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\Form\Extension\Csrf\CsrfProvider\CsrfProviderInterface;
use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpFoundation\ResponseHeaderBag;
use Symfony\Component\HttpFoundation\StreamedResponse;
use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
use Symfony\Component\HttpKernel\Exception\HttpException;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
use Symfony\Component\Routing\RouterInterface;

/**
 * @Route("/files", service="irstea_file_upload.upload_controller")
 */
class UploadController extends Controller
{
    /**
     *
     * @var FileManagerInterface
     */
    protected $fileManager;

    /**
     *
     * @var RouterInterface
     */
    protected $router;

    /**
     * @var CsrfProviderInterface
     */
    protected $csrfProvider;

    /**
     *
     */
    public function __construct(FileManagerInterface $fileManager, RouterInterface $router, CsrfProviderInterface $csrfProvider)
    {
        $this->fileManager = $fileManager;
        $this->router = $router;
        $this->csrfProvider = $csrfProvider;
    }

    /**
     * @Route("", name="file_upload_create")
     * @Method("POST")
     * @param Request $request
     */
    public function createAction(Request $request)
    {
        $data = $request->request->get('file');

        $file = $this->fileManager->create($data['name'], $data['size'], $data['type'], $data['lastModified']);

        $token = $this->csrfProvider->generateCsrfToken("file-upload");

        $location = $this->router->generate(
            'file_upload_put',
            [
                'id' => $file->getId(),
                'token' => $token
            ],
            RouterInterface::ABSOLUTE_URL
        );

        return $this->createResponse(
            Response::HTTP_CREATED,
            'New file created',
            [ 'id' => $file->getId(), 'url' => $location ],
            [ 'Location' => $location ]
        );
    }

    /**
     * @Route("/{id}", name="file_upload_put")
     * @Method("PUT")
     * @param Request $request
     * @param UploadedFile $file
     */
    public function putAction(Request $request, UploadedFile $file)
    {
        $this->validateToken($request);

        $range = $request->headers->get('Content-Range');
        $final = true;

        if($range) {
            $matches = [];
            if(!preg_match('@^bytes (\d+)-(\d+)/(\d+)$@', $range, $matches)) {
                throw new BadRequestHttpException("Invalid Content-Range");
            }
            $start = intval($matches[1]);
            $end   = intval($matches[2]);
            $total = intval($matches[3]);

            $stream = $file->open('ab');
            $stream->seek($start);

            $final = $end === ($total-1);

        } else {
            $stream = $file->open('wb');
        }

        $stream->write($request->getContent());
        $stream->close();

        if(!$final) {
            return $this->createResponse(Response::HTTP_OK, 'Chunk received', ['range' => compact('start', 'end', 'total')]);
        }

        $this->fileManager->completed($file);

        $parameters = [
            'id'    => $file->getId(),
            'token' => $request->query->get('token')
        ];

        return $this->createResponse(
            Response::HTTP_OK,
            'File uploaded',
            [
                'files' => [
                    [
                        'id'          => $file->getId(),
                        'name'        => $file->getOriginalFilename(),
                        'type'        => $file->getMimeType(),
                        'size'        => $file->getSize(),
                        'url'         => $this->router->generate('file_upload_get', $parameters),
                        'delete_type' => 'DELETE',
                        'delete_url'  => $this->router->generate('file_upload_delete', $parameters),
                    ]
                ]
            ]
        );
    }

    /**
     * @Route("/{id}", name="file_upload_get")
     * @Method("GET")
     * @param Request $request
     * @param UploadedFile $file
     */
    public function getAction(Request $request, UploadedFile $file)
    {
        $this->validateToken($request);

        if(!$file->isValid()) {
            throw new NotFoundHttpException();
        }

        $response = StreamedResponse::create(function() use($file) { echo $file->getContent(); })
            ->setPrivate()
            ->setLastModified($file->getLastModified())
            ->setEtag($file->getChecksum());

        $response->headers->add(
            [
                'Content-Type'        => $file->getMimeType(),
                'Content-Length'      => $file->getSize(),
                'Content-Disposition' => $response->headers->makeDisposition(
                    ResponseHeaderBag::DISPOSITION_ATTACHMENT,
                    $file->getOriginalFilename()
                ),
            ]
        );

        $response->isNotModified($request);

        return $response;
    }

    /**
     * @Route("/{id}", name="file_upload_delete")
     * @Method("DELETE")
     * @param Request $request
     * @param UploadedFile $file
     */
    public function deleteAction(Request $request, UploadedFile $file)
    {
        $this->validateToken($request);

        $this->fileManager->delete($file);

        return $this->createResponse();
    }

    /**
     *
     * @param Request $request
     * @throws HttpException
     */
    protected function validateToken(Request $request)
    {
        if(!$this->csrfProvider->isCsrfTokenValid("file-upload", $request->query->get('token', null))) {
            throw new HttpException(Response::HTTP_FORBIDDEN, 'Invalid token');
        }
    }

    /**
     *
     * @param int $status
     * @param string $message
     * @param array $data
     * @param array $headers
     * @return JsonResponse
     */
    protected function createResponse($status = Response::HTTP_OK, $message = 'OK', array $data = [], array $headers = [])
    {
        $data['status'] = $status;
        $data['message'] = $message;
        return new JsonResponse($data, $status, $headers);
    }
}