<?php

/*
 * ShowController.php
 * Copyright (c) 2021 james@firefly-iii.org
 *
 * This file is part of Firefly III (https://github.com/firefly-iii).
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

declare(strict_types=1);

namespace FireflyIII\Api\V1\Controllers\Models\Attachment;

use FireflyIII\Api\V1\Controllers\Controller;
use FireflyIII\Api\V1\Middleware\ApiDemoUser;
use FireflyIII\Api\V1\Requests\PaginationRequest;
use FireflyIII\Exceptions\FireflyException;
use FireflyIII\Models\Attachment;
use FireflyIII\Repositories\Attachment\AttachmentRepositoryInterface;
use FireflyIII\Transformers\AttachmentTransformer;
use FireflyIII\User;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Response as LaravelResponse;
use Illuminate\Pagination\LengthAwarePaginator;
use Illuminate\Support\Facades\Log;
use League\Fractal\Pagination\IlluminatePaginatorAdapter;
use League\Fractal\Resource\Collection as FractalCollection;
use League\Fractal\Resource\Item;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;

/**
 * Class ShowController
 */
final class ShowController extends Controller
{
    private AttachmentRepositoryInterface $repository;

    /**
     * ShowController constructor.
     */
    public function __construct()
    {
        parent::__construct();
        $this->middleware(ApiDemoUser::class)->except(['delete', 'download', 'show', 'index']);
        $this->middleware(function ($request, $next) {
            /** @var User $user */
            $user             = auth()->user();
            $this->repository = app(AttachmentRepositoryInterface::class);
            $this->repository->setUser($user);

            return $next($request);
        });
    }

    /**
     * This endpoint is documented at:
     * https://api-docs.firefly-iii.org/?urls.primaryName=2.0.0%20(v1)#/attachments/downloadAttachment
     *
     * Download an attachment.
     *
     * @throws FireflyException
     */
    public function download(Attachment $attachment): LaravelResponse
    {
        if (true === auth()->user()->hasRole('demo')) {
            Log::channel('audit')->warning(sprintf('Demo user tries to access attachment API in %s', __METHOD__));

            throw new NotFoundHttpException();
        }
        if (false === $attachment->uploaded) {
            throw new FireflyException('200000: File has not been uploaded (yet).');
        }
        if (0 === $attachment->size) {
            throw new FireflyException('200000: File has not been uploaded (yet).');
        }
        if ($this->repository->exists($attachment)) {
            $content  = $this->repository->getContent($attachment);
            if ('' === $content) {
                throw new FireflyException('200002: File is empty (zero bytes).');
            }
            $quoted   = sprintf('"%s"', addcslashes(basename($attachment->filename), '"\\'));

            /** @var LaravelResponse $response */
            $response = response($content);
            $response
                ->header('Content-Description', 'File Transfer')
                ->header('Content-Type', 'application/octet-stream')
                ->header('Content-Disposition', 'attachment; filename='.$quoted)
                ->header('Content-Transfer-Encoding', 'binary')
                ->header('Connection', 'Keep-Alive')
                ->header('Expires', '0')
                ->header('Cache-Control', 'must-revalidate, post-check=0, pre-check=0')
                ->header('Pragma', 'public')
                ->header('Content-Length', (string) strlen($content))
            ;

            return $response;
        }

        throw new FireflyException('200003: File does not exist.');
    }

    /**
     * This endpoint is documented at:
     * https://api-docs.firefly-iii.org/?urls.primaryName=2.0.0%20(v1)#/attachments/listAttachment
     *
     * Display a listing of the resource.
     */
    public function index(PaginationRequest $request): JsonResponse
    {
        ['limit' => $limit, 'offset' => $offset, 'page' => $page] = $request->attributes->all();

        if (true === auth()->user()->hasRole('demo')) {
            Log::channel('audit')->warning(sprintf('Demo user tries to access attachment API in %s', __METHOD__));

            throw new NotFoundHttpException();
        }

        $manager                                                  = $this->getManager();

        // get list of attachments. Count it and split it.
        $collection                                               = $this->repository->get();
        $count                                                    = $collection->count();
        $attachments                                              = $collection->slice($offset, $limit);

        // make paginator:
        $paginator                                                = new LengthAwarePaginator($attachments, $count, $limit, $page);
        $paginator->setPath(route('api.v1.attachments.index').$this->buildParams());

        /** @var AttachmentTransformer $transformer */
        $transformer                                              = app(AttachmentTransformer::class);

        $resource                                                 = new FractalCollection($attachments, $transformer, 'attachments');
        $resource->setPaginator(new IlluminatePaginatorAdapter($paginator));

        return response()->json($manager->createData($resource)->toArray())->header('Content-Type', self::CONTENT_TYPE);
    }

    /**
     * This endpoint is documented at:
     * https://api-docs.firefly-iii.org/?urls.primaryName=2.0.0%20(v1)#/attachments/getAttachment
     *
     * Display the specified resource.
     */
    public function show(Attachment $attachment): JsonResponse
    {
        if (true === auth()->user()->hasRole('demo')) {
            Log::channel('audit')->warning(sprintf('Demo user tries to access attachment API in %s', __METHOD__));

            throw new NotFoundHttpException();
        }
        $manager     = $this->getManager();

        /** @var AttachmentTransformer $transformer */
        $transformer = app(AttachmentTransformer::class);

        $resource    = new Item($attachment, $transformer, 'attachments');

        return response()->json($manager->createData($resource)->toArray())->header('Content-Type', self::CONTENT_TYPE);
    }
}
