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

/* ----- Settings ----- */

define('DOKU_INC', realpath(dirname(__FILE__).'/../../../').'/');
define('DISCUSSION_NS', 'discussion');

/* ----- Main ----- */

// conversion script should only be run once
if (@file_exists(dirname(__FILE__).'/convert_completed'))
die('Conversion already completed.');

require_once(DOKU_INC.'inc/init.php');
require_once(DOKU_INC.'inc/common.php');
require_once(DOKU_INC.'inc/io.php');
require_once(DOKU_INC.'inc/search.php');
require_once(DOKU_INC.'inc/pageutils.php');
require_once(DOKU_INC.'inc/parserutils.php');

$files = getDiscussionPages();
$n     = 0;

foreach ($files as $file) {
    if (convertDiscussionPage($file)) {
        echo $file['id'].'<br />';
        $n++;
    }
}

if ($n > 0) {
    io_saveFile(dirname(__FILE__).'/convert_completed', '');
    echo '<br />Successfully converted '.$n.' discussion pages to new comments meta files.';
} else {
    echo 'No discussion pages found.';
}

/* ----- Functions ----- */

/**
 * returns a list of all discussion pages in the wiki
 */
function getDiscussionPages() {
    global $conf;

    $data = array();
    search($data, $conf['datadir'], 'search_discussionpages', array());
    return $data;
}

/**
 * function for the search callback
 */
function search_discussionpages(&$data, $base, $file, $type, $lvl, $opts) {
    global $conf;

    if ($type == 'd') return true; // recurse into directories
    if (!preg_match('#'.preg_quote('/'.DISCUSSION_NS.'/', '#').'#u', $file)) return false;
    if (!preg_match('#\.txt$#', $file)) return false;

    $id = pathID(str_replace(DISCUSSION_NS.'/', '', $file));
    $data[] = array(
            'id'  => $id,
            'old' => $conf['datadir'].$file,
            'new' => metaFN($id, '.comments')
            );
    return true;
}

/**
 * this converts individual discussion pages to .comment meta files
 */
function convertDiscussionPage($file) {

    // read the old file
    $data = io_readFile($file['old'], false);

    // handle file with no comments yet
    if (trim($data) == '') {
        io_saveFile($file['new'], serialize(array('status' => 1, 'number' => 0)));
        @unlink($file['old']);
        return true;
    }

    // break it up into pieces
    $old = explode('----', $data);

    // merge with possibly already existing (newer) comments
    $comments = array();
    if (@file_exists($file['new']))
        $comments = unserialize(io_readFile($file['old'], false));

    // set general info
    if (!isset($comments['status'])) $comments['status'] = 1;
    $comments['number'] += count($old);

    foreach ($old as $comment) {

        // prepare comment data
        if (strpos($comment, '<sub>') !== false) {
            $in  = '<sub>';
            $out = ':</sub>';
        } else {
            $in  = '//';
            $out = ': //';
        }
        list($meta, $raw)  = explode($out, $comment, 2);
        $raw  = trim($raw);

        // skip empty comments
        if (!$raw) {
            $comments['number']--;
            continue;
        }

        list($mail, $meta) = explode($in, $meta, 2);
        list($name, $strd) = explode(', ', $meta, 2);
        $date = strtotime($strd);
        if ($date == -1) $date = time();
        if ($mail) {
            list($mail) = explode(' |', $mail, 2);
            $mail = substr(strrchr($mail, '>'), 1);
        }
        $cid  = md5($name.$date);

        // render comment
        $xhtml = p_render('xhtml', p_get_instructions($raw), $info);

        // fill in the converted comment
        $comments['comments'][$cid] = array(
                'user'    => array(
                    'name' => hsc($name),
                    'mail' => hsc($mail)),
                'date'    => array('created' => $date),
                'show'    => true,
                'raw'     => $raw,
                'xhtml'   => $xhtml,
                'replies' => array()
                );
    }

    // save the new file
    io_saveFile($file['new'], serialize($comments));

    // remove the old file
    @unlink($file['old']);

    return true;
}
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