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<?php
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/**
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 * StatusNet, the distributed open-source microblogging tool
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 *
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 * Action for displaying the public stream
 *
 * PHP version 5
 *
 * LICENCE: This program is free software: you can redistribute it and/or modify
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 * 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.
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 *
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 * 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.
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 *
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 * 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/>.
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 *
 * @category  Public
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 * @package   StatusNet
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 * @author    Evan Prodromou <evan@status.net>
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 * @copyright 2008-2009 StatusNet, Inc.
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 * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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 * @link      http://status.net/
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 */

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if (!defined('STATUSNET') && !defined('LACONICA')) {
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    exit(1);
}
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require_once INSTALLDIR.'/lib/publicgroupnav.php';
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require_once INSTALLDIR.'/lib/noticelist.php';
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require_once INSTALLDIR.'/lib/feedlist.php';
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// Farther than any human will go

define('MAX_PUBLIC_PAGE', 100);

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/**
 * Action for displaying the public stream
 *
 * @category Public
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 * @package  StatusNet
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 * @author   Evan Prodromou <evan@status.net>
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 * @license  http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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 * @link     http://status.net/
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 *
 * @see      PublicrssAction
 * @see      PublicxrdsAction
 */
class PublicAction extends Action
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{
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    /**
     * page of the stream we're on; default = 1
     */
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    var $page = null;
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    var $notice;
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    var $userProfile = null;
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    function isReadOnly($args)
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    {
        return true;
    }

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    /**
     * Read and validate arguments
     *
     * @param array $args URL parameters
     *
     * @return boolean success value
     */
    function prepare($args)
    {
        parent::prepare($args);
        $this->page = ($this->arg('page')) ? ($this->arg('page')+0) : 1;
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        if ($this->page > MAX_PUBLIC_PAGE) {
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            // TRANS: Client error displayed when requesting a public timeline page beyond the page limit.
            // TRANS: %s is the page limit.
            $this->clientError(sprintf(_('Beyond the page limit (%s).'), MAX_PUBLIC_PAGE));
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        }

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        common_set_returnto($this->selfUrl());
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        $this->userProfile = Profile::current();
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        $user = common_current_user();
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        if (!empty($user) && $user->streamModeOnly()) {
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            $stream = new PublicNoticeStream($this->userProfile);
        } else {
            $stream = new ThreadingPublicNoticeStream($this->userProfile);
        }
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        $this->notice = $stream->getNotices(($this->page-1)*NOTICES_PER_PAGE,
                                            NOTICES_PER_PAGE + 1);
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        if (!$this->notice) {
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            // TRANS: Server error displayed when a public timeline cannot be retrieved.
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            $this->serverError(_('Could not retrieve public timeline.'));
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            return;
        }

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        if($this->page > 1 && $this->notice->N == 0){
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            // TRANS: Server error when page not found (404).
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            $this->serverError(_('No such page.'),$code=404);
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        }

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        return true;
    }
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    /**
     * handle request
     *
     * Show the public stream, using recipe method showPage()
     *
     * @param array $args arguments, mostly unused
     *
     * @return void
     */
    function handle($args)
    {
        parent::handle($args);
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        $this->showPage();
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    }

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    /**
     * Title of the page
     *
     * @return page title, including page number if over 1
     */
    function title()
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    {
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        if ($this->page > 1) {
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            // TRANS: Title for all public timeline pages but the first.
            // TRANS: %d is the page number.
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            return sprintf(_('Public timeline, page %d'), $this->page);
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        } else {
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            // TRANS: Title for the first public timeline page.
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            return _('Public timeline');
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        }
    }
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    function extraHead()
    {
        parent::extraHead();
        $this->element('meta', array('http-equiv' => 'X-XRDS-Location',
                                           'content' => common_local_url('publicxrds')));
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        $rsd = common_local_url('rsd');

        // RSD, http://tales.phrasewise.com/rfc/rsd

        $this->element('link', array('rel' => 'EditURI',
                                     'type' => 'application/rsd+xml',
                                     'href' => $rsd));
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    }
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    /**
     * Output <head> elements for RSS and Atom feeds
     *
     * @return void
     */
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    function getFeeds()
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    {
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        return array(new Feed(Feed::JSON,
                              common_local_url('ApiTimelinePublic',
                                               array('format' => 'as')),
                              // TRANS: Link description for public timeline feed.
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                              _('Public Timeline Feed (Activity Streams JSON)')),
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                    new Feed(Feed::RSS1, common_local_url('publicrss'),
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                              // TRANS: Link description for public timeline feed.
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                              _('Public Timeline Feed (RSS 1.0)')),
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                     new Feed(Feed::RSS2,
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                              common_local_url('ApiTimelinePublic',
                                               array('format' => 'rss')),
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                              // TRANS: Link description for public timeline feed.
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                              _('Public Timeline Feed (RSS 2.0)')),
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                     new Feed(Feed::ATOM,
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                              common_local_url('ApiTimelinePublic',
                                               array('format' => 'atom')),
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                              // TRANS: Link description for public timeline feed.
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                              _('Public Timeline Feed (Atom)')));
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    }

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    function showEmptyList()
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    {
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        // TRANS: Text displayed for public feed when there are no public notices.
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        $message = _('This is the public timeline for %%site.name%% but no one has posted anything yet.') . ' ';
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        if (common_logged_in()) {
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            // TRANS: Additional text displayed for public feed when there are no public notices for a logged in user.
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            $message .= _('Be the first to post!');
        }
        else {
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            if (! (common_config('site','closed') || common_config('site','inviteonly'))) {
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                // TRANS: Additional text displayed for public feed when there are no public notices for a not logged in user.
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                $message .= _('Why not [register an account](%%action.register%%) and be the first to post!');
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            }
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        }
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        $this->elementStart('div', 'guide');
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        $this->raw(common_markup_to_html($message));
        $this->elementEnd('div');
    }

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    /**
     * Fill the content area
     *
     * Shows a list of the notices in the public stream, with some pagination
     * controls.
     *
     * @return void
     */
    function showContent()
    {
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        $user = common_current_user();

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        if (!empty($user) && $user->streamModeOnly()) {
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            $nl = new NoticeList($this->notice, $this);
        } else {
            $nl = new ThreadedNoticeList($this->notice, $this, $this->userProfile);
        }
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        $cnt = $nl->show();
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        if ($cnt == 0) {
            $this->showEmptyList();
        }

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        $this->pagination($this->page > 1, $cnt > NOTICES_PER_PAGE,
                          $this->page, 'public');
    }

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    function showSections()
    {
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        // Show invite button, as long as site isn't closed, and
        // we have a logged in user.
        if (!common_config('site', 'closed') && common_logged_in()) {
            if (!common_config('site', 'private')) {
                $ibs = new InviteButtonSection(
                    $this,
                    // TRANS: Button text for inviting more users to the StatusNet instance.
                    // TRANS: Less business/enterprise-oriented language for public sites.
                    _m('BUTTON', 'Send invite')
                );
            } else {
                $ibs = new InviteButtonSection($this);
            }
            $ibs->show();
        }

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        $pop = new PopularNoticeSection($this);
        $pop->show();
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        if (!common_config('performance', 'high')) {
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            $cloud = new PublicTagCloudSection($this);
            $cloud->show();
        }
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        $feat = new FeaturedUsersSection($this);
        $feat->show();
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    }
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    function showAnonymousMessage()
    {
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        if (! (common_config('site','closed') || common_config('site','inviteonly'))) {
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            // TRANS: Message for not logged in users at an invite-only site trying to view the public feed of notices.
            // TRANS: This message contains Markdown links. Please mind the formatting.
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            $m = _('This is %%site.name%%, a [micro-blogging](http://en.wikipedia.org/wiki/Micro-blogging) service ' .
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                   'based on the Free Software [StatusNet](http://status.net/) tool. ' .
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                   '[Join now](%%action.register%%) to share notices about yourself with friends, family, and colleagues! ' .
                   '([Read more](%%doc.help%%))');
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        } else {
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            // TRANS: Message for not logged in users at a closed site trying to view the public feed of notices.
            // TRANS: This message contains Markdown links. Please mind the formatting.
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            $m = _('This is %%site.name%%, a [micro-blogging](http://en.wikipedia.org/wiki/Micro-blogging) service ' .
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                   'based on the Free Software [StatusNet](http://status.net/) tool.');
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        }
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        $this->elementStart('div', array('id' => 'anon_notice'));
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        $this->raw(common_markup_to_html($m));
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        $this->elementEnd('div');
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    }
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}
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class ThreadingPublicNoticeStream extends ThreadingNoticeStream
{
    function __construct($profile)
    {
        parent::__construct(new PublicNoticeStream($profile));
    }
}