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<?php

namespace Wallabag\ApiBundle\Controller;

use FOS\RestBundle\Controller\FOSRestController;
use Nelmio\ApiDocBundle\Annotation\ApiDoc;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Wallabag\CoreBundle\Entity\Entry;
use Wallabag\CoreBundle\Entity\Tag;
use Hateoas\Configuration\Route;
use Hateoas\Representation\Factory\PagerfantaFactory;

class WallabagRestController extends FOSRestController
{
    /**
     * @param Entry  $entry
     * @param string $tags
     */
    private function assignTagsToEntry(Entry $entry, $tags)
    {
        foreach (explode(',', $tags) as $label) {
            $label = trim($label);
            $tagEntity = $this
                ->getDoctrine()
                ->getRepository('WallabagCoreBundle:Tag')
                ->findOneByLabel($label);

            if (is_null($tagEntity)) {
                $tagEntity = new Tag($this->getUser());
                $tagEntity->setLabel($label);
            }

            // only add the tag on the entry if the relation doesn't exist
            if (!$entry->getTags()->contains($tagEntity)) {
                $entry->addTag($tagEntity);
            }
        }
    }

    private function validateAuthentication()
    {
        if (false === $this->get('security.context')->isGranted('IS_AUTHENTICATED_FULLY')) {
            throw new AccessDeniedException();
        }
    }

    /**
     * Retrieve all entries. It could be filtered by many options.
     *
     * @ApiDoc(
     *       parameters={
     *          {"name"="archive", "dataType"="boolean", "required"=false, "format"="true or false, all entries by default", "description"="filter by archived status."},
     *          {"name"="star", "dataType"="boolean", "required"=false, "format"="true or false, all entries by default", "description"="filter by starred status."},
     *          {"name"="sort", "dataType"="string", "required"=false, "format"="'created' or 'updated', default 'created'", "description"="sort entries by date."},
     *          {"name"="order", "dataType"="string", "required"=false, "format"="'asc' or 'desc', default 'desc'", "description"="order of sort."},
     *          {"name"="page", "dataType"="integer", "required"=false, "format"="default '1'", "description"="what page you want."},
     *          {"name"="perPage", "dataType"="integer", "required"=false, "format"="default'30'", "description"="results per page."},
     *          {"name"="tags", "dataType"="string", "required"=false, "format"="api%2Crest", "description"="a list of tags url encoded. Will returns entries that matches ALL tags."},
     *       }
     * )
     *
     * @return Entry
     */
    public function getEntriesAction(Request $request)
    {
        $this->validateAuthentication();

        $isArchived = $request->query->get('archive');
        $isStarred = $request->query->get('star');
        $sort = $request->query->get('sort', 'created');
        $order = $request->query->get('order', 'desc');
        $page = (int) $request->query->get('page', 1);
        $perPage = (int) $request->query->get('perPage', 30);
        $tags = $request->query->get('tags', []);

        $pager = $this
            ->getDoctrine()
            ->getRepository('WallabagCoreBundle:Entry')
            ->findEntries($this->getUser()->getId(), $isArchived, $isStarred, $sort, $order);

        $pager->setCurrentPage($page);
        $pager->setMaxPerPage($perPage);

        $pagerfantaFactory = new PagerfantaFactory('page', 'perPage');
        $paginatedCollection = $pagerfantaFactory->createRepresentation(
            $pager,
            new Route('api_get_entries', [], $absolute = true)
        );

        $json = $this->get('serializer')->serialize($paginatedCollection, 'json');

        return $this->renderJsonResponse($json);
    }

    /**
     * Retrieve a single entry.
     *
     * @ApiDoc(
     *      requirements={
     *          {"name"="entry", "dataType"="integer", "requirement"="\w+", "description"="The entry ID"}
     *      }
     * )
     *
     * @return Entry
     */
    public function getEntryAction(Entry $entry)
    {
        $this->validateAuthentication();
        $this->validateUserAccess($entry->getUser()->getId());

        $json = $this->get('serializer')->serialize($entry, 'json');

        return $this->renderJsonResponse($json);
    }

    /**
     * Create an entry.
     *
     * @ApiDoc(
     *       parameters={
     *          {"name"="url", "dataType"="string", "required"=true, "format"="http://www.test.com/article.html", "description"="Url for the entry."},
     *          {"name"="title", "dataType"="string", "required"=false, "description"="Optional, we'll get the title from the page."},
     *          {"name"="tags", "dataType"="string", "required"=false, "format"="tag1,tag2,tag3", "description"="a comma-separated list of tags."},
     *       }
     * )
     *
     * @return Entry
     */
    public function postEntriesAction(Request $request)
    {
        $this->validateAuthentication();

        $url = $request->request->get('url');

        $entry = $this->get('wallabag_core.content_proxy')->updateEntry(
            new Entry($this->getUser()),
            $url
        );

        $tags = $request->request->get('tags', '');
        if (!empty($tags)) {
            $this->assignTagsToEntry($entry, $tags);
        }

        $em = $this->getDoctrine()->getManager();
        $em->persist($entry);
        $em->flush();

        $json = $this->get('serializer')->serialize($entry, 'json');

        return $this->renderJsonResponse($json);
    }

    /**
     * Change several properties of an entry.
     *
     * @ApiDoc(
     *      requirements={
     *          {"name"="entry", "dataType"="integer", "requirement"="\w+", "description"="The entry ID"}
     *      },
     *      parameters={
     *          {"name"="title", "dataType"="string", "required"=false},
     *          {"name"="tags", "dataType"="string", "required"=false, "format"="tag1,tag2,tag3", "description"="a comma-separated list of tags."},
     *          {"name"="archive", "dataType"="boolean", "required"=false, "format"="true or false", "description"="archived the entry."},
     *          {"name"="star", "dataType"="boolean", "required"=false, "format"="true or false", "description"="starred the entry."},
     *      }
     * )
     *
     * @return Entry
     */
    public function patchEntriesAction(Entry $entry, Request $request)
    {
        $this->validateAuthentication();
        $this->validateUserAccess($entry->getUser()->getId());

        $title = $request->request->get('title');
        $isArchived = $request->request->get('is_archived');
        $isStarred = $request->request->get('is_starred');

        if (!is_null($title)) {
            $entry->setTitle($title);
        }

        if (!is_null($isArchived)) {
            $entry->setArchived($isArchived);
        }

        if (!is_null($isStarred)) {
            $entry->setStarred($isStarred);
        }

        $tags = $request->request->get('tags', '');
        if (!empty($tags)) {
            $this->assignTagsToEntry($entry, $tags);
        }

        $em = $this->getDoctrine()->getManager();
        $em->flush();

        $json = $this->get('serializer')->serialize($entry, 'json');

        return $this->renderJsonResponse($json);
    }

    /**
     * Delete **permanently** an entry.
     *
     * @ApiDoc(
     *      requirements={
     *          {"name"="entry", "dataType"="integer", "requirement"="\w+", "description"="The entry ID"}
     *      }
     * )
     *
     * @return Entry
     */
    public function deleteEntriesAction(Entry $entry)
    {
        $this->validateAuthentication();
        $this->validateUserAccess($entry->getUser()->getId());

        $em = $this->getDoctrine()->getManager();
        $em->remove($entry);
        $em->flush();

        $json = $this->get('serializer')->serialize($entry, 'json');

        return $this->renderJsonResponse($json);
    }

    /**
     * Retrieve all tags for an entry.
     *
     * @ApiDoc(
     *      requirements={
     *          {"name"="entry", "dataType"="integer", "requirement"="\w+", "description"="The entry ID"}
     *      }
     * )
     */
    public function getEntriesTagsAction(Entry $entry)
    {
        $this->validateAuthentication();
        $this->validateUserAccess($entry->getUser()->getId());

        $json = $this->get('serializer')->serialize($entry->getTags(), 'json');

        return $this->renderJsonResponse($json);
    }

    /**
     * Add one or more tags to an entry.
     *
     * @ApiDoc(
     *      requirements={
     *          {"name"="entry", "dataType"="integer", "requirement"="\w+", "description"="The entry ID"}
     *      },
     *      parameters={
     *          {"name"="tags", "dataType"="string", "required"=false, "format"="tag1,tag2,tag3", "description"="a comma-separated list of tags."},
     *       }
     * )
     */
    public function postEntriesTagsAction(Request $request, Entry $entry)
    {
        $this->validateAuthentication();
        $this->validateUserAccess($entry->getUser()->getId());

        $tags = $request->request->get('tags', '');
        if (!empty($tags)) {
            $this->assignTagsToEntry($entry, $tags);
        }

        $em = $this->getDoctrine()->getManager();
        $em->persist($entry);
        $em->flush();

        $json = $this->get('serializer')->serialize($entry, 'json');

        return $this->renderJsonResponse($json);
    }

    /**
     * Permanently remove one tag for an entry.
     *
     * @ApiDoc(
     *      requirements={
     *          {"name"="tag", "dataType"="integer", "requirement"="\w+", "description"="The tag ID"},
     *          {"name"="entry", "dataType"="integer", "requirement"="\w+", "description"="The entry ID"}
     *      }
     * )
     */
    public function deleteEntriesTagsAction(Entry $entry, Tag $tag)
    {
        $this->validateAuthentication();
        $this->validateUserAccess($entry->getUser()->getId());

        $entry->removeTag($tag);
        $em = $this->getDoctrine()->getManager();
        $em->persist($entry);
        $em->flush();

        $json = $this->get('serializer')->serialize($entry, 'json');

        return $this->renderJsonResponse($json);
    }

    /**
     * Retrieve all tags.
     *
     * @ApiDoc()
     */
    public function getTagsAction()
    {
        $this->validateAuthentication();
        $json = $this->get('serializer')->serialize($this->getUser()->getTags(), 'json');

        return $this->renderJsonResponse($json);
    }

    /**
     * Permanently remove one tag from **every** entry.
     *
     * @ApiDoc(
     *      requirements={
     *          {"name"="tag", "dataType"="integer", "requirement"="\w+", "description"="The tag"}
     *      }
     * )
     */
    public function deleteTagAction(Tag $tag)
    {
        $this->validateAuthentication();
        $this->validateUserAccess($tag->getUser()->getId());

        $em = $this->getDoctrine()->getManager();
        $em->remove($tag);
        $em->flush();

        $json = $this->get('serializer')->serialize($tag, 'json');

        return $this->renderJsonResponse($json);
    }

    /**
     * Validate that the first id is equal to the second one.
     * If not, throw exception. It means a user try to access information from an other user.
     *
     * @param int $requestUserId User id from the requested source
     */
    private function validateUserAccess($requestUserId)
    {
        $user = $this->get('security.context')->getToken()->getUser();
        if ($requestUserId != $user->getId()) {
            throw $this->createAccessDeniedException('Access forbidden. Entry user id: '.$requestUserId.', logged user id: '.$user->getId());
        }
    }

    /**
     * Send a JSON Response.
     * We don't use the Symfony JsonRespone, because it takes an array as parameter instead of a JSON string.
     *
     * @param string $json
     *
     * @return Response
     */
    private function renderJsonResponse($json)
    {
        return new Response($json, 200, array('application/json'));
    }
}