<?php namespace BookStack\Http\Controllers;

use BookStack\Exceptions\ImageUploadException;
use BookStack\Repos\ImageRepo;
use Illuminate\Filesystem\Filesystem as File;
use Illuminate\Http\Request;
use BookStack\Image;
use BookStack\Repos\PageRepo;

class ImageController extends Controller
{
    protected $image;
    protected $file;
    protected $imageRepo;

    /**
     * ImageController constructor.
     * @param Image $image
     * @param File $file
     * @param ImageRepo $imageRepo
     */
    public function __construct(Image $image, File $file, ImageRepo $imageRepo)
    {
        $this->image = $image;
        $this->file = $file;
        $this->imageRepo = $imageRepo;
        parent::__construct();
    }

    /**
     * Get all images for a specific type, Paginated
     * @param string $type
     * @param int $page
     * @return \Illuminate\Http\JsonResponse
     */
    public function getAllByType($type, $page = 0)
    {
        $imgData = $this->imageRepo->getPaginatedByType($type, $page);
        return response()->json($imgData);
    }

    /**
     * Search through images within a particular type.
     * @param $type
     * @param int $page
     * @param Request $request
     * @return mixed
     */
    public function searchByType($type, $page = 0, Request $request)
    {
        $this->validate($request, [
            'term' => 'required|string'
        ]);

        $searchTerm = $request->get('term');
        $imgData = $this->imageRepo->searchPaginatedByType($type, $page, 24, $searchTerm);
        return response()->json($imgData);
    }

    /**
     * Get all images for a user.
     * @param int $page
     * @return \Illuminate\Http\JsonResponse
     */
    public function getAllForUserType($page = 0)
    {
        $imgData = $this->imageRepo->getPaginatedByType('user', $page, 24, $this->currentUser->id);
        return response()->json($imgData);
    }

    /**
     * Get gallery images with a specific filter such as book or page
     * @param $filter
     * @param int $page
     * @param Request $request
     */
    public function getGalleryFiltered($filter, $page = 0, Request $request)
    {
        $this->validate($request, [
            'page_id' => 'required|integer'
        ]);

        $validFilters = collect(['page', 'book']);
        if (!$validFilters->contains($filter)) return response('Invalid filter', 500);

        $pageId = $request->get('page_id');
        $imgData = $this->imageRepo->getGalleryFiltered($page, 24, strtolower($filter), $pageId);

        return response()->json($imgData);
    }

    /**
     * Handles image uploads for use on pages.
     * @param string $type
     * @param Request $request
     * @return \Illuminate\Http\JsonResponse
     */
    public function uploadByType($type, Request $request)
    {
        $this->checkPermission('image-create-all');
        $this->validate($request, [
            'file' => 'is_image'
        ]);

        $imageUpload = $request->file('file');

        try {
            $uploadedTo = $request->has('uploaded_to') ? $request->get('uploaded_to') : 0;
            $image = $this->imageRepo->saveNew($imageUpload, $type, $uploadedTo);
        } catch (ImageUploadException $e) {
            return response($e->getMessage(), 500);
        }

        return response()->json($image);
    }

    /**
     * Generate a sized thumbnail for an image.
     * @param $id
     * @param $width
     * @param $height
     * @param $crop
     * @return \Illuminate\Http\JsonResponse
     */
    public function getThumbnail($id, $width, $height, $crop)
    {
        $this->checkPermission('image-create-all');
        $image = $this->imageRepo->getById($id);
        $thumbnailUrl = $this->imageRepo->getThumbnail($image, $width, $height, $crop == 'false');
        return response()->json(['url' => $thumbnailUrl]);
    }

    /**
     * Update image details
     * @param integer $imageId
     * @param Request $request
     * @return \Illuminate\Http\JsonResponse
     */
    public function update($imageId, Request $request)
    {
        $this->validate($request, [
            'name' => 'required|min:2|string'
        ]);
        $image = $this->imageRepo->getById($imageId);
        $this->checkOwnablePermission('image-update', $image);
        $image = $this->imageRepo->updateImageDetails($image, $request->all());
        return response()->json($image);
    }

    /**
     * Deletes an image and all thumbnail/image files
     * @param PageRepo $pageRepo
     * @param Request $request
     * @param int $id
     * @return \Illuminate\Http\JsonResponse
     */
    public function destroy(PageRepo $pageRepo, Request $request, $id)
    {
        $image = $this->imageRepo->getById($id);
        $this->checkOwnablePermission('image-delete', $image);

        // Check if this image is used on any pages
        $isForced = ($request->has('force') && ($request->get('force') === 'true') || $request->get('force') === true);
        if (!$isForced) {
            $pageSearch = $pageRepo->searchForImage($image->url);
            if ($pageSearch !== false) {
                return response()->json($pageSearch, 400);
            }
        }

        $this->imageRepo->destroyImage($image);
        return response()->json('Image Deleted');
    }


}