<?php namespace BookStack\Http\Controllers\Api;

use BookStack\Entities\Repos\BookshelfRepo;
use BookStack\Entities\Models\Bookshelf;
use Exception;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;
use Illuminate\Http\Request;
use Illuminate\Validation\ValidationException;

class BookshelfApiController extends ApiController
{

    /**
     * @var BookshelfRepo
     */
    protected $bookshelfRepo;

    protected $rules = [
        'create' => [
            'name' => 'required|string|max:255',
            'description' => 'string|max:1000',
            'books' => 'array',
        ],
        'update' => [
            'name' => 'string|min:1|max:255',
            'description' => 'string|max:1000',
            'books' => 'array',
        ],
    ];

    /**
     * BookshelfApiController constructor.
     */
    public function __construct(BookshelfRepo $bookshelfRepo)
    {
        $this->bookshelfRepo = $bookshelfRepo;
    }

    /**
     * Get a listing of shelves visible to the user.
     */
    public function list()
    {
        $shelves = Bookshelf::visible();
        return $this->apiListingResponse($shelves, [
            'id', 'name', 'slug', 'description', 'created_at', 'updated_at', 'created_by', 'updated_by', 'image_id',
        ]);
    }

    /**
     * Create a new shelf in the system.
     * An array of books IDs can be provided in the request. These
     * will be added to the shelf in the same order as provided.
     * @throws ValidationException
     */
    public function create(Request $request)
    {
        $this->checkPermission('bookshelf-create-all');
        $requestData = $this->validate($request, $this->rules['create']);

        $bookIds = $request->get('books', []);
        $shelf = $this->bookshelfRepo->create($requestData, $bookIds);

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

    /**
     * View the details of a single shelf.
     */
    public function read(string $id)
    {
        $shelf = Bookshelf::visible()->with([
            'tags', 'cover', 'createdBy', 'updatedBy',
            'books' => function (BelongsToMany $query) {
                $query->visible()->get(['id', 'name', 'slug']);
            }
        ])->findOrFail($id);
        return response()->json($shelf);
    }

    /**
     * Update the details of a single shelf.
     * An array of books IDs can be provided in the request. These
     * will be added to the shelf in the same order as provided and overwrite
     * any existing book assignments.
     * @throws ValidationException
     */
    public function update(Request $request, string $id)
    {
        $shelf = Bookshelf::visible()->findOrFail($id);
        $this->checkOwnablePermission('bookshelf-update', $shelf);

        $requestData = $this->validate($request, $this->rules['update']);
        $bookIds = $request->get('books', null);

        $shelf = $this->bookshelfRepo->update($shelf, $requestData, $bookIds);
        return response()->json($shelf);
    }


    /**
     * Delete a single shelf from the system.
     * @throws Exception
     */
    public function delete(string $id)
    {
        $shelf = Bookshelf::visible()->findOrFail($id);
        $this->checkOwnablePermission('bookshelf-delete', $shelf);

        $this->bookshelfRepo->destroy($shelf);
        return response('', 204);
    }
}