<?php

namespace BookStack\Http\Controllers;

use BookStack\Actions\ActivityQueries;
use BookStack\Actions\ActivityType;
use BookStack\Actions\View;
use BookStack\Entities\Models\Bookshelf;
use BookStack\Entities\Repos\BookRepo;
use BookStack\Entities\Tools\BookContents;
use BookStack\Entities\Tools\Cloner;
use BookStack\Entities\Tools\HierarchyTransformer;
use BookStack\Entities\Tools\PermissionsUpdater;
use BookStack\Entities\Tools\ShelfContext;
use BookStack\Exceptions\ImageUploadException;
use BookStack\Exceptions\NotFoundException;
use BookStack\Facades\Activity;
use BookStack\References\ReferenceFetcher;
use Illuminate\Http\Request;
use Illuminate\Validation\ValidationException;
use Throwable;

class BookController extends Controller
{
    protected BookRepo $bookRepo;
    protected ShelfContext $shelfContext;
    protected ReferenceFetcher $referenceFetcher;

    public function __construct(ShelfContext $entityContextManager, BookRepo $bookRepo, ReferenceFetcher $referenceFetcher)
    {
        $this->bookRepo = $bookRepo;
        $this->shelfContext = $entityContextManager;
        $this->referenceFetcher = $referenceFetcher;
    }

    /**
     * Display a listing of the book.
     */
    public function index()
    {
        $view = setting()->getForCurrentUser('books_view_type');
        $sort = setting()->getForCurrentUser('books_sort', 'name');
        $order = setting()->getForCurrentUser('books_sort_order', 'asc');

        $books = $this->bookRepo->getAllPaginated(18, $sort, $order);
        $recents = $this->isSignedIn() ? $this->bookRepo->getRecentlyViewed(4) : false;
        $popular = $this->bookRepo->getPopular(4);
        $new = $this->bookRepo->getRecentlyCreated(4);

        $this->shelfContext->clearShelfContext();

        $this->setPageTitle(trans('entities.books'));

        return view('books.index', [
            'books'   => $books,
            'recents' => $recents,
            'popular' => $popular,
            'new'     => $new,
            'view'    => $view,
            'sort'    => $sort,
            'order'   => $order,
        ]);
    }

    /**
     * Show the form for creating a new book.
     */
    public function create(string $shelfSlug = null)
    {
        $this->checkPermission('book-create-all');

        $bookshelf = null;
        if ($shelfSlug !== null) {
            $bookshelf = Bookshelf::visible()->where('slug', '=', $shelfSlug)->firstOrFail();
            $this->checkOwnablePermission('bookshelf-update', $bookshelf);
        }

        $this->setPageTitle(trans('entities.books_create'));

        return view('books.create', [
            'bookshelf' => $bookshelf,
        ]);
    }

    /**
     * Store a newly created book in storage.
     *
     * @throws ImageUploadException
     * @throws ValidationException
     */
    public function store(Request $request, string $shelfSlug = null)
    {
        $this->checkPermission('book-create-all');
        $validated = $this->validate($request, [
            'name'        => ['required', 'string', 'max:255'],
            'description' => ['string', 'max:1000'],
            'image'       => array_merge(['nullable'], $this->getImageValidationRules()),
            'tags'        => ['array'],
        ]);

        $bookshelf = null;
        if ($shelfSlug !== null) {
            $bookshelf = Bookshelf::visible()->where('slug', '=', $shelfSlug)->firstOrFail();
            $this->checkOwnablePermission('bookshelf-update', $bookshelf);
        }

        $book = $this->bookRepo->create($validated);

        if ($bookshelf) {
            $bookshelf->appendBook($book);
            Activity::add(ActivityType::BOOKSHELF_UPDATE, $bookshelf);
        }

        return redirect($book->getUrl());
    }

    /**
     * Display the specified book.
     */
    public function show(Request $request, ActivityQueries $activities, string $slug)
    {
        $book = $this->bookRepo->getBySlug($slug);
        $bookChildren = (new BookContents($book))->getTree(true);
        $bookParentShelves = $book->shelves()->scopes('visible')->get();

        View::incrementFor($book);
        if ($request->has('shelf')) {
            $this->shelfContext->setShelfContext(intval($request->get('shelf')));
        }

        $this->setPageTitle($book->getShortName());

        return view('books.show', [
            'book'              => $book,
            'current'           => $book,
            'bookChildren'      => $bookChildren,
            'bookParentShelves' => $bookParentShelves,
            'activity'          => $activities->entityActivity($book, 20, 1),
            'referenceCount'    => $this->referenceFetcher->getPageReferenceCountToEntity($book),
        ]);
    }

    /**
     * Show the form for editing the specified book.
     */
    public function edit(string $slug)
    {
        $book = $this->bookRepo->getBySlug($slug);
        $this->checkOwnablePermission('book-update', $book);
        $this->setPageTitle(trans('entities.books_edit_named', ['bookName'=>$book->getShortName()]));

        return view('books.edit', ['book' => $book, 'current' => $book]);
    }

    /**
     * Update the specified book in storage.
     *
     * @throws ImageUploadException
     * @throws ValidationException
     * @throws Throwable
     */
    public function update(Request $request, string $slug)
    {
        $book = $this->bookRepo->getBySlug($slug);
        $this->checkOwnablePermission('book-update', $book);

        $validated = $this->validate($request, [
            'name'        => ['required', 'string', 'max:255'],
            'description' => ['string', 'max:1000'],
            'image'       => array_merge(['nullable'], $this->getImageValidationRules()),
            'tags'        => ['array'],
        ]);

        if ($request->has('image_reset')) {
            $validated['image'] = null;
        } elseif (array_key_exists('image', $validated) && is_null($validated['image'])) {
            unset($validated['image']);
        }

        $book = $this->bookRepo->update($book, $validated);

        return redirect($book->getUrl());
    }

    /**
     * Shows the page to confirm deletion.
     */
    public function showDelete(string $bookSlug)
    {
        $book = $this->bookRepo->getBySlug($bookSlug);
        $this->checkOwnablePermission('book-delete', $book);
        $this->setPageTitle(trans('entities.books_delete_named', ['bookName' => $book->getShortName()]));

        return view('books.delete', ['book' => $book, 'current' => $book]);
    }

    /**
     * Remove the specified book from the system.
     *
     * @throws Throwable
     */
    public function destroy(string $bookSlug)
    {
        $book = $this->bookRepo->getBySlug($bookSlug);
        $this->checkOwnablePermission('book-delete', $book);

        $this->bookRepo->destroy($book);

        return redirect('/books');
    }

    /**
     * Show the permissions view.
     */
    public function showPermissions(string $bookSlug)
    {
        $book = $this->bookRepo->getBySlug($bookSlug);
        $this->checkOwnablePermission('restrictions-manage', $book);

        return view('books.permissions', [
            'book' => $book,
        ]);
    }

    /**
     * Set the restrictions for this book.
     *
     * @throws Throwable
     */
    public function permissions(Request $request, PermissionsUpdater $permissionsUpdater, string $bookSlug)
    {
        $book = $this->bookRepo->getBySlug($bookSlug);
        $this->checkOwnablePermission('restrictions-manage', $book);

        $permissionsUpdater->updateFromPermissionsForm($book, $request);

        $this->showSuccessNotification(trans('entities.books_permissions_updated'));

        return redirect($book->getUrl());
    }

    /**
     * Show the view to copy a book.
     *
     * @throws NotFoundException
     */
    public function showCopy(string $bookSlug)
    {
        $book = $this->bookRepo->getBySlug($bookSlug);
        $this->checkOwnablePermission('book-view', $book);

        session()->flashInput(['name' => $book->name]);

        return view('books.copy', [
            'book' => $book,
        ]);
    }

    /**
     * Create a copy of a book within the requested target destination.
     *
     * @throws NotFoundException
     */
    public function copy(Request $request, Cloner $cloner, string $bookSlug)
    {
        $book = $this->bookRepo->getBySlug($bookSlug);
        $this->checkOwnablePermission('book-view', $book);
        $this->checkPermission('book-create-all');

        $newName = $request->get('name') ?: $book->name;
        $bookCopy = $cloner->cloneBook($book, $newName);
        $this->showSuccessNotification(trans('entities.books_copy_success'));

        return redirect($bookCopy->getUrl());
    }

    /**
     * Convert the chapter to a book.
     */
    public function convertToShelf(HierarchyTransformer $transformer, string $bookSlug)
    {
        $book = $this->bookRepo->getBySlug($bookSlug);
        $this->checkOwnablePermission('book-update', $book);
        $this->checkOwnablePermission('book-delete', $book);
        $this->checkPermission('bookshelf-create-all');
        $this->checkPermission('book-create-all');

        $shelf = $transformer->transformBookToShelf($book);

        return redirect($shelf->getUrl());
    }
}