<?php
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social 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.
//
// GNU social 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 GNU social.  If not, see <http://www.gnu.org/licenses/>.

/**
 * ActivityPub implementation for GNU social
 *
 * @package   GNUsocial
 * @author    Diogo Cordeiro <diogo@fc.up.pt>
 * @copyright 2018-2019 Free Software Foundation, Inc http://www.fsf.org
 * @license   https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
 * @link      http://www.gnu.org/software/social/
 */

defined('GNUSOCIAL') || die();

/**
 * Inbox Request Handler
 *
 * @category  Plugin
 * @package   GNUsocial
 * @author    Diogo Cordeiro <diogo@fc.up.pt>
 * @license   https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
 */
class apActorOutboxAction extends ManagedAction
{
    protected $needLogin = false;
    protected $canPost   = true;

    /**
     * Handle the Outbox request
     *
     * @author Daniel Supernault <danielsupernault@gmail.com>
     */
    protected function handle()
    {
        try {
            $profile = Profile::getByID($this->trimmed('id'));
            $profile_id = $profile->getID();
        } catch (Exception $e) {
            ActivityPubReturn::error('Invalid Actor URI.', 404);
        }

        if (!$profile->isLocal()) {
            ActivityPubReturn::error("This is not a local user.", 403);
        }

        if (!isset($_GET["page"])) {
            $page = 0;
        } else {
            $page = intval($this->trimmed('page'));
        }

        if ($page < 0) {
            ActivityPubReturn::error('Invalid page number.');
        }

        $since = ($page - 1) * PROFILES_PER_MINILIST;
        $limit = (($page - 1) == 0 ? 1 : $page) * PROFILES_PER_MINILIST;

        /* Calculate total items */
        $total_notes = $profile->noticeCount();
        $total_pages = ceil($total_notes / PROFILES_PER_MINILIST);

        $res = [
            '@context'     => [
              "https://www.w3.org/ns/activitystreams",
              "https://w3id.org/security/v1",
            ],
            'id'           => common_local_url('apActorOutbox', ['id' => $profile_id]).(($page != 0) ? '?page='.$page : ''),
            'type'         => ($page == 0 ? 'OrderedCollection' : 'OrderedCollectionPage'),
            'totalItems'   => $total_notes
        ];

        if ($page == 0) {
            $res['first'] = common_local_url('apActorOutbox', ['id' => $profile_id]).'?page=1';
        } else {
            $res['orderedItems'] = $this->generate_outbox($profile);
            $res['partOf'] = common_local_url('apActorOutbox', ['id' => $profile_id]);

            if ($page+1 < $total_pages) {
                $res['next'] = common_local_url('apActorOutbox', ['id' => $profile_id]).'page='.($page+1 == 1 ? 2 : $page+1);
            }

            if ($page > 1) {
                $res['prev'] = common_local_url('apActorOutbox', ['id' => $profile_id]).'?page='.($page-1 <= 0 ? 1 : $page-1);
            }
        }

        ActivityPubReturn::answer($res);
    }

    /**
     * Generates a list of people following given profile.
     *
     * @param Profile $profile
     * @return array of Notices
     * @throws EmptyPkeyValueException
     * @throws InvalidUrlException
     * @throws ServerException
     * @author Daniel Supernault <danielsupernault@gmail.com>
     */
    public function generate_outbox($profile)
    {
        /* Fetch Notices */
        $notices = [];
        $notice = $profile->getNotices();
        while ($notice->fetch()) {
            $note = $notice;

            // TODO: Handle other types
            if ($note->object_type == 'http://activitystrea.ms/schema/1.0/note') {
                $notices[] = Activitypub_create::create_to_array(
                    $note->getProfile()->getUri(),
                    common_local_url('apNotice', ['id' => $note->getID()]),
                    Activitypub_notice::notice_to_array($note)
                );
            }
        }

        return $notices;
    }
}