<?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/>.

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

class RawEventsNoticeStream extends NoticeStream
{
    public function getNoticeIds($offset, $limit, $since_id, $max_id)
    {
        $notice = new Notice();

        $notice->selectAdd();
        $notice->selectAdd('notice.*');

        $notice->joinAdd(['uri', 'happening:uri']);

        $notice->whereAdd('notice.is_local <> ' . Notice::GATEWAY);

        Notice::addWhereSinceId($notice, $since_id, 'notice.id', 'happening.created');
        Notice::addWhereMaxId($notice, $max_id, 'notice.id', 'happening.created');

        // NOTE: we sort by event time, not by notice time!
        $notice->orderBy('happening.created DESC');
        if (!is_null($offset)) {
            $notice->limit($offset, $limit);
        }

        $ids = [];
        if ($notice->find()) {
            while ($notice->fetch()) {
                $ids[] = $notice->id;
            }
        }

        $notice->free();
        unset($notice);
        return $ids;
    }
}

class EventsNoticeStream extends ScopingNoticeStream
{
    // possible values of RSVP in our database
    protected $rsvp = ['Y', 'N', '?'];
    protected $target = null;

    public function __construct(Profile $target, Profile $scoped = null, array $rsvp = [])
    {
        $stream = new RawEventsNoticeStream();

        if ($target->sameAs($scoped)) {
            $key = 'happening:ids_for_user_own:'.$target->getID();
        } else {
            $key = 'happening:ids_for_user:'.$target->getID();
        }

        // Match RSVP against our possible values, given in the class variable
        // and if no RSVPs are given is empty, assume we want all events, even
        // without RSVPs from this profile.
        $this->rsvp = array_intersect($this->rsvp, $rsvp);
        $this->target = $target;

        parent::__construct(new CachingNoticeStream($stream, $key), $scoped);
    }

    protected function filter(Notice $notice)
    {
        if (!parent::filter($notice)) {
            // if not in our scope, return false
            return false;
        }

        if (empty($this->rsvp)) {
            // Don't filter on RSVP (for only events with RSVP if no responses
            // are given (give ['Y', 'N', '?'] for only RSVP'd events!).
            return true;
        }

        $rsvp = new RSVP();
        $rsvp->profile_id = $this->target->getID();
        $rsvp->event_uri  = $notice->getUri();
        $rsvp->whereAddIn('response', $this->rsvp, $rsvp->columnType('response'));

        // filter out if no RSVP match was found
        return $rsvp->N > 0;
    }
}