<?php

namespace Directus\Api\Routes;

use Directus\Application\Application;
use Directus\Application\Http\Request;
use Directus\Application\Http\Response;
use Directus\Application\Route;
use Directus\Database\Schema\SchemaManager;
use Directus\Exception\BatchUploadNotAllowedException;
use Directus\Exception\Exception;
use Directus\Filesystem\Exception\FailedUploadException;
use Directus\Services\FilesServices;
use Directus\Services\RevisionsService;
use Directus\Util\ArrayUtils;
use Directus\Util\StringUtils;
use Slim\Http\UploadedFile;

class Files extends Route
{
    /**
     * @param Application $app
     */
    public function __invoke(Application $app)
    {
        $app->post('', [$this, 'create']);
        $app->get('/{id}', [$this, 'read']);
        $app->patch('/{id}', [$this, 'update']);
        $app->patch('', [$this, 'update']);
        $app->delete('/{id}', [$this, 'delete']);
        $app->get('', [$this, 'all']);

        // Revisions
        $app->get('/{id}/revisions', [$this, 'fileRevisions']);
        $app->get('/{id}/revisions/{offset}', [$this, 'oneFileRevision']);
    }

    /**
     * @param Request $request
     * @param Response $response
     *
     * @return Response
     *
     * @throws Exception
     */
    public function create(Request $request, Response $response)
    {
        $this->validateRequestPayload($request);
        $service = new FilesServices($this->container);
        $uploadedFiles = $request->getUploadedFiles();
        $payload = $request->getParsedBody();

        if (count($uploadedFiles) > 1 || (isset($payload[0]) && is_array($payload[0]))) {
            throw new BatchUploadNotAllowedException();
        }

        if (!empty($uploadedFiles)) {
            /** @var UploadedFile $uploadedFile */
            $uploadedFile = array_shift($uploadedFiles);
            if (!\Directus\is_uploaded_file_okay($uploadedFile->getError())) {
                throw new FailedUploadException($uploadedFile->getError());
            }

            // TODO: the file already exists move it to the upload path location
            $payload = array_merge([
                'filename_disk' => $uploadedFile->getClientFilename(),
                'filename_download' => $uploadedFile->getClientFilename(),
                'data' => $uploadedFile,
            ], $payload);
        }

        $responseData = $service->create(
            $payload,
            $request->getQueryParams()
        );

        // You can move place this define statement in other files if you're investigating
        // memory usage and trying to nail down where it's coming from (you'll be able to
        // see the memory usage at the point of the define() in the X-Memory-Usage response
        // header).
        //define('X_MEM_USAGE', memory_get_peak_usage(true));
        //$response = $response->withHeader('X-Memory-Usage', X_MEM_USAGE);

        return $this->responseWithData($request, $response, $responseData);
    }

    /**
     * @param Request $request
     * @param Response $response
     *
     * @return Response
     */
    public function read(Request $request, Response $response)
    {
        $service = new FilesServices($this->container);
        $responseData = $service->findByIds(
            $request->getAttribute('id'),
            ArrayUtils::pick($request->getParams(), ['fields', 'meta'])
        );

        return $this->responseWithData($request, $response, $responseData);
    }

    /**
     * @param Request $request
     * @param Response $response
     *
     * @return Response
     */
    public function update(Request $request, Response $response)
    {
        $this->validateRequestPayload($request);

        $payload = $request->getParsedBody();
        if (isset($payload[0]) && is_array($payload[0])) {
            return $this->batch($request, $response);
        }

        $id = $request->getAttribute('id');
        if (strpos($id, ',') !== false) {
            return $this->batch($request, $response);
        }

        $service = new FilesServices($this->container);
        $responseData = $service->update(
            $request->getAttribute('id'),
            $request->getParsedBody(),
            $request->getQueryParams()
        );
        return $this->responseWithData($request, $response, $responseData);
    }

    public function delete(Request $request, Response $response)
    {
        $id = $request->getAttribute('id');
        if (strpos($id, ',') !== false) {
            return $this->batch($request, $response);
        }

        $service = new FilesServices($this->container);
        $service->delete(
            $id,
            $request->getQueryParams()
        );

        return $this->responseWithData($request, $response, []);
    }

    /**
     * @param Request $request
     * @param Response $response
     *
     * @return Response
     */
    public function all(Request $request, Response $response)
    {
        $service = new FilesServices($this->container);
        $responseData = $service->findAll($request->getQueryParams());

        return $this->responseWithData($request, $response, $responseData);
    }

    /**
     * @param Request $request
     * @param Response $response
     *
     * @return Response
     */
    public function fileRevisions(Request $request, Response $response)
    {
        $service = new RevisionsService($this->container);
        $responseData = $service->findAllByItem(
            SchemaManager::COLLECTION_FILES,
            $request->getAttribute('id'),
            $request->getQueryParams()
        );

        return $this->responseWithData($request, $response, $responseData);
    }

    /**
     * @param Request $request
     * @param Response $response
     *
     * @return Response
     */
    public function oneFileRevision(Request $request, Response $response)
    {
        $service = new RevisionsService($this->container);
        $responseData = $service->findOneByItemOffset(
            SchemaManager::COLLECTION_FILES,
            $request->getAttribute('id'),
            $request->getAttribute('offset'),
            $request->getQueryParams()
        );

        return $this->responseWithData($request, $response, $responseData);
    }

    /**
     * @param Request $request
     * @param Response $response
     *
     * @return Response
     */
    public function fileRevert(Request $request, Response $response)
    {
        $service = new RevisionsService($this->container);
        $responseData = $service->revert(
            SchemaManager::COLLECTION_FILES,
            $request->getAttribute('id'),
            $request->getAttribute('revision'),
            $request->getQueryParams()
        );

        return $this->responseWithData($request, $response, $responseData);
    }

    /**
     * @param Request $request
     * @param Response $response
     *
     * @return Response
     *
     * @throws \Exception
     */
    protected function batch(Request $request, Response $response)
    {
        $filesService = new FilesServices($this->container);
        $payload = $request->getParsedBody();
        $params = $request->getQueryParams();

        $responseData = null;
        if ($request->isPatch()) {
            if ($request->getAttribute('id')) {
                $ids = StringUtils::safeCvs($request->getAttribute('id'));
                $responseData = $filesService->batchUpdateWithIds($ids, $payload, $params);
            } else {
                $responseData = $filesService->batchUpdate($payload, $params);
            }
        } else if ($request->isDelete()) {
            $ids = explode(',', $request->getAttribute('id'));
            $filesService->batchDeleteWithIds($ids, $params);
        }

        return $this->responseWithData($request, $response, $responseData);
    }
}