<?php
/**
 * StatusNet - the distributed open-source microblogging tool
 * Copyright (C) 2011, StatusNet, Inc.
 *
 * A stream of notices
 *
 * PHP version 5
 *
 * This program 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.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * @category  Stream
 * @package   StatusNet
 * @author    Evan Prodromou <evan@status.net>
 * @copyright 2011 StatusNet, Inc.
 * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
 * @link      http://status.net/
 */

if (!defined('STATUSNET')) {
    // This check helps protect against security problems;
    // your code file can't be executed directly from the web.
    exit(1);
}

/**
 * Class for notice streams
 *
 * @category  Stream
 * @package   StatusNet
 * @author    Evan Prodromou <evan@status.net>
 * @copyright 2011 StatusNet, Inc.
 * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
 * @link      http://status.net/
 */
abstract class NoticeStream
{
    abstract function getNoticeIds($offset, $limit, $since_id, $max_id);

    function getNotices($offset, $limit, $sinceId = null, $maxId = null)
    {
        $ids = $this->getNoticeIds($offset, $limit, $sinceId, $maxId);

        $notices = self::getStreamByIds($ids);

        return $notices;
    }

    static function getStreamByIds($ids)
    {
        $cache = Cache::instance();

        if (!empty($cache)) {
            $notices = array();
            foreach ($ids as $id) {
                $n = Notice::staticGet('id', $id);
                if (!empty($n)) {
                    $notices[] = $n;
                }
            }
            return new ArrayWrapper($notices);
        } else {
            $notice = new Notice();
            if (empty($ids)) {
                //if no IDs requested, just return the notice object
                return $notice;
            }
            $notice->whereAdd('id in (' . implode(', ', $ids) . ')');

            $notice->find();

            $temp = array();

            while ($notice->fetch()) {
                $temp[$notice->id] = clone($notice);
            }

            $wrapped = array();

            foreach ($ids as $id) {
                if (array_key_exists($id, $temp)) {
                    $wrapped[] = $temp[$id];
                }
            }

            return new ArrayWrapper($wrapped);
        }
    }
}