<?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/>.

/**
 * Show the newest groups
 *
 * @category  API
 * @package   GNUsocial
 * @author    Craig Andrews <candrews@integralblue.com>
 * @author    Evan Prodromou <evan@status.net>
 * @author    Jeffery To <jeffery.to@gmail.com>
 * @author    Zach Copley <zach@status.net>
 * @copyright 2009 StatusNet, Inc.
 * @copyright 2009 Free Software Foundation, Inc http://www.fsf.org
 * @license   https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
 */

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

/**
 * Returns of the lastest 20 groups for the site
 *
 * @copyright 2009 StatusNet, Inc.
 * @copyright 2009 Free Software Foundation, Inc http://www.fsf.org
 * @license   https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
 */
class ApiGroupListAllAction extends ApiPrivateAuthAction
{
    public $groups = null;

    /**
     * Take arguments for running
     *
     * @param array $args $_REQUEST args
     *
     * @return boolean success flag
     */
    public function prepare(array $args = [])
    {
        parent::prepare($args);

        $this->user   = $this->getTargetUser(null);
        $this->groups = $this->getGroups();

        return true;
    }

    /**
     * Handle the request
     *
     * Show the user's groups
     *
     * @param array $args $_REQUEST data (unused)
     *
     * @return void
     */
    public function handle()
    {
        parent::handle();

        $sitename   = common_config('site', 'name');
        // TRANS: Message is used as a title when listing the lastest 20 groups. %s is a site name.
        $title      = sprintf(_("%s groups"), $sitename);
        $taguribase = TagURI::base();
        $id         = "tag:$taguribase:Groups";
        $link       = common_local_url('groups');
        // TRANS: Message is used as a subtitle when listing the latest 20 groups. %s is a site name.
        $subtitle   = sprintf(_("groups on %s"), $sitename);

        switch ($this->format) {
        case 'xml':
            $this->showXmlGroups($this->groups);
            break;
        case 'rss':
            $this->showRssGroups($this->groups, $title, $link, $subtitle);
            break;
        case 'atom':
            $selfuri = common_root_url() .
                'api/statusnet/groups/list_all.atom';
            $this->showAtomGroups(
                $this->groups,
                $title,
                $id,
                $link,
                $subtitle,
                $selfuri
            );
            break;
        case 'json':
            $this->showJsonGroups($this->groups);
            break;
        default:
            $this->clientError(
                // TRANS: Client error displayed when coming across a non-supported API method.
                _('API method not found.'),
                404,
                $this->format
            );
            break;
        }
    }

    /**
     * Get groups
     *
     * @return array groups
     */
    public function getGroups()
    {
        $group = new User_group();

        $group->selectAdd();
        $group->selectAdd('user_group.*');
        $group->joinAdd(['id', 'local_group:group_id']);
        $group->orderBy('user_group.created DESC, user_group.id DESC');

        $offset = ((int) $this->page - 1) * (int) $this->count;
        $group->limit($offset, $this->count);

        $groups = [];
        if ($group->find()) {
            while ($group->fetch()) {
                $groups[] = clone $group;
            }
        }

        return $groups;
    }

    /**
     * Is this action read only?
     *
     * @param array $args other arguments
     *
     * @return boolean true
     */
    public function isReadOnly($args)
    {
        return true;
    }

    /**
     * When was this feed last modified?
     *
     * @return string datestamp of the site's latest group
     */
    public function lastModified()
    {
        if (!empty($this->groups) && (count($this->groups) > 0)) {
            return strtotime($this->groups[0]->created);
        }

        return null;
    }

    /**
     * An entity tag for this list of groups
     *
     * Returns an Etag based on the action name, language, and
     * timestamps of the first and last group the user has joined
     *
     * @return string etag
     */
    public function etag()
    {
        if (!empty($this->groups) && (count($this->groups) > 0)) {
            $last = count($this->groups) - 1;

            return '"' . implode(
                ':',
                array($this->arg('action'),
                      common_user_cache_hash($this->auth_user),
                      common_language(),
                      strtotime($this->groups[0]->created),
                      strtotime($this->groups[$last]->created))
            )
            . '"';
        }

        return null;
    }
}