<?php
/**
 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
 * @author     Esther Brunner <wikidesign@gmail.com>
 */

/**
 * Class helper_plugin_discussion
 */
class helper_plugin_discussion extends DokuWiki_Plugin {

    /**
     * @return array
     */
    function getMethods() {
        $result = array();
        $result[] = array(
                'name'   => 'th',
                'desc'   => 'returns the header of the comments column for pagelist',
                'return' => array('header' => 'string'),
                );
        $result[] = array(
                'name'   => 'td',
                'desc'   => 'returns the link to the discussion section with number of comments',
                'params' => array(
                    'id' => 'string',
                    'number of comments (optional)' => 'integer'),
                'return' => array('link' => 'string'),
                );
        $result[] = array(
                'name'   => 'getThreads',
                'desc'   => 'returns pages with discussion sections, sorted by recent comments',
                'params' => array(
                    'namespace' => 'string',
                    'number (optional)' => 'integer'),
                'return' => array('pages' => 'array'),
                );
        $result[] = array(
                'name'   => 'getComments',
                'desc'   => 'returns recently added or edited comments individually',
                'params' => array(
                    'namespace' => 'string',
                    'number (optional)' => 'integer'),
                'return' => array('pages' => 'array'),
                );
        return $result;
    }

    /**
     * Returns the column header for the Pagelist Plugin
     *
     * @return string
     */
    function th() {
        return $this->getLang('discussion');
    }

    /**
     * Returns the link to the discussion section of a page
     *
     * @param string $id
     * @param null|int $num
     * @return string
     */
    function td($id, $num = null) {
        $section = '#discussion__section';

        if (!isset($num)) {
            $cfile = metaFN($id, '.comments');
            $comments = unserialize(io_readFile($cfile, false));

            $num = $comments['number'];
            if ((!$comments['status']) || (($comments['status'] == 2) && (!$num))) return '';
        }

        if ($num == 0) {
            $comment = '0&nbsp;'.$this->getLang('nocomments');
        } elseif ($num == 1) {
            $comment = '1&nbsp;'.$this->getLang('comment');
        } else {
            $comment = $num.'&nbsp;'.$this->getLang('comments');
        }

        return '<a href="'.wl($id).$section.'" class="wikilink1" title="'.$id.$section.'">'.
            $comment.'</a>';
    }

    /**
     * Returns an array of pages with discussion sections, sorted by recent comments
     * Note: also used for content by Feed Plugin
     *
     * @param string $ns
     * @param null|int $num
     * @param string|bool $skipEmpty
     * @return array
     */
    function getThreads($ns, $num = null, $skipEmpty = false) {
        global $conf;

        require_once(DOKU_INC.'inc/search.php');

        $dir = $conf['datadir'].utf8_encodeFN(($ns ? '/'.str_replace(':', '/', $ns): ''));

        // returns the list of pages in the given namespace and it's subspaces
        $items = array();
        search($items, $dir, 'search_allpages', array());

        // add pages with comments to result
        $result = array();
        foreach ($items as $item) {
            $id   = ($ns ? $ns.':' : '').$item['id'];

            // some checks
            $perm = auth_quickaclcheck($id);
            if ($perm < AUTH_READ) continue;    // skip if no permission
            $file = metaFN($id, '.comments');
            if (!@file_exists($file)) continue; // skip if no comments file
            $data = unserialize(io_readFile($file, false));
            $status = $data['status'];
            $number = $data['number'];

            if (!$status || (($status == 2) && (!$number))) continue; // skip if comments are off or closed without comments
            if($skipEmpty == 'y' && $number == 0) continue; // skip if discussion is empty and flag is set

            $date = filemtime($file);
            $meta = p_get_metadata($id);
            $result[$date.'_'.$id] = array(
                    'id'       => $id,
                    'file'     => $file,
                    'title'    => $meta['title'],
                    'date'     => $date,
                    'user'     => $meta['creator'],
                    'desc'     => $meta['description']['abstract'],
                    'num'      => $number,
                    'comments' => $this->td($id, $number),
                    'status'   => $status,
                    'perm'     => $perm,
                    'exists'   => true,
                    'anchor'   => 'discussion__section',
                    );
        }

        // finally sort by time of last comment
        krsort($result);

        if (is_numeric($num)) $result = array_slice($result, 0, $num);

        return $result;
    }

    /**
     * Returns an array of recently added comments to a given page or namespace
     * Note: also used for content by Feed Plugin
     *
     * @param string $ns
     * @param int|null $num
     * @return array
     */
    function getComments($ns, $num = NULL) {
        global $conf;

        $first  = $_REQUEST['first'];
        if (!is_numeric($first)) $first = 0;

        if ((!$num) || (!is_numeric($num))) $num = $conf['recent'];

        $result = array();
        $count  = 0;

        if (!@file_exists($conf['metadir'].'/_comments.changes')) return $result;

        // read all recent changes. (kept short)
        $lines = file($conf['metadir'].'/_comments.changes');

        $seen = array(); //caches seen pages in order to skip them
        // handle lines
        $line_num = count($lines);
        for ($i = ($line_num - 1); $i >= 0; $i--) {
            $rec = $this->_handleRecentComment($lines[$i], $ns, $seen);
            if ($rec !== false) {
                if (--$first >= 0) continue; // skip first entries
                $result[$rec['date']] = $rec;
                $count++;
                // break when we have enough entries
                if ($count >= $num) break;
            }
        }

        // finally sort by time of last comment
        krsort($result);

        return $result;
    }

    /* ---------- Changelog function adapted for the Discussion Plugin ---------- */

    /**
     * Internal function used by $this->getComments()
     *
     * don't call directly
     *
     * @see getRecentComments()
     * @author Andreas Gohr <andi@splitbrain.org>
     * @author Ben Coburn <btcoburn@silicodon.net>
     * @author Esther Brunner <wikidesign@gmail.com>
     *
     * @param string $line
     * @param string $ns
     * @param array  $seen
     * @return array|bool
     */
    function _handleRecentComment($line, $ns, &$seen) {
        if (empty($line)) return false;  //skip empty lines

        // split the line into parts
        $recent = parseChangelogLine($line);
        if ($recent === false) return false;

        $cid     = $recent['extra'];
        $fullcid = $recent['id'].'#'.$recent['extra'];

        // skip seen ones
        if (isset($seen[$fullcid])) return false;

        // skip 'show comment' log entries
        if ($recent['type'] === 'sc') return false;

        // remember in seen to skip additional sights
        $seen[$fullcid] = 1;

        // check if it's a hidden page or comment
        if (isHiddenPage($recent['id'])) return false;
        if ($recent['type'] === 'hc') return false;

        // filter namespace or id
        if (($ns) && (strpos($recent['id'].':', $ns.':') !== 0)) return false;

        // check ACL
        $recent['perm'] = auth_quickaclcheck($recent['id']);
        if ($recent['perm'] < AUTH_READ) return false;

        // check existance
        $recent['file'] = wikiFN($recent['id']);
        $recent['exists'] = @file_exists($recent['file']);
        if (!$recent['exists']) return false;
        if ($recent['type'] === 'dc') return false;

        // get discussion meta file name
        $data = unserialize(io_readFile(metaFN($recent['id'], '.comments'), false));

        // check if discussion is turned off
        if ($data['status'] === 0) return false;

        $parent_id = $cid;
        // Check for the comment and all parents if they exist and are visible.
        do  {
            $tcid = $parent_id;

            // check if the comment still exists
            if (!isset($data['comments'][$tcid])) return false;
            // check if the comment is visible
            if ($data['comments'][$tcid]['show'] != 1) return false;

            $parent_id = $data['comments'][$tcid]['parent'];
        } while ($parent_id && $parent_id != $tcid);

        // okay, then add some additional info
        if (is_array($data['comments'][$cid]['user'])) {
            $recent['name'] = $data['comments'][$cid]['user']['name'];
        } else {
            $recent['name'] = $data['comments'][$cid]['name'];
        }
        $recent['desc'] = strip_tags($data['comments'][$cid]['xhtml']);
        $recent['anchor'] = 'comment_'.$cid;

        return $recent;
    }

    /**
     * @return bool
     */
    function isDiscussionMod() {
        global $USERINFO;
        $groups = trim($this->getConf('moderatorgroups'));

        if(auth_ismanager()) return true;
        // Check if user is member of the moderator groups
        if(!empty($groups) && auth_isMember($groups, $_SERVER['REMOTE_USER'], (array)$USERINFO['grps'])) return true;

        return false;
    }
}
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