<?php

// (c) Copyright by authors of the Tiki Wiki CMS Groupware Project
//
// All Rights Reserved. See copyright.txt for details and a complete list of authors.
// Licensed under the GNU LESSER GENERAL PUBLIC LICENSE. See license.txt for details.
// $Id$

if (basename($_SERVER['SCRIPT_NAME']) === basename(__FILE__)) {
    die('This script may only be included.');
}

function svn_last_update()
{
    $cachelib = TikiLib::lib('cache');
    $cache = $cachelib->getSerialized('svn_last_update');

    if ($cache && is_readable('.svn') && $cache['wcdb_mtime'] < filemtime('.svn/wc.db')) {
        $cache = false;
    }

    if ($cache) {
        return $cache;
    } else {
        $cache = [];
    }

    if (is_readable('.svn')) {
        $svn = [];
        if (is_readable('.svn/entries')) {
            $fp = fopen('.svn/entries', 'r');
            for ($i = 0; 10 > $i && $line = fgets($fp, 80); ++$i) {
                $svn[] = $line;
            }
            fclose($fp);
        }

        if (count($svn) > 2) {
            // Standard SVN client
            $cache['svnrev'] = $svn[3];
            $cache['lastup'] = strtotime($svn[9]);
        } else {
            // Check for Tortoise 1.7+ SVN client, if sqlite3 is present
            if (extension_loaded('sqlite3')) {
                $location = '.svn/wc.db';
                if (is_file($location)) {
                    $handle = new SQLite3($location);

                    // Assign svnrev
                    $query = "select max(changed_revision) as svnrev from nodes";
                    $result = $handle->query($query);
                    $svnrev = $lastupTime = $strDT = '';
                    if ($result) {
                        $resx = $result->fetchArray(SQLITE3_ASSOC);
                        $cache['svnrev'] = $resx['svnrev'];
                    }

                    // Assign lastup
                    $query = "select max(changed_date)/1000000 as lastup from nodes";
                    $result = $handle->query($query);
                    if ($result) {
                        $resx = $result->fetchArray(SQLITE3_ASSOC);
                        $lastupTime = (int)$resx['lastup'];
                        $dt = new DateTime();
                        $dt->setTimestamp($lastupTime);
                        $cache['lastup'] = $dt->format(DateTime::ISO8601);
                    }

                    // Release/Unlock the database afterwards
                    $handle->close();
                }
            }
        }
        $cache['wcdb_mtime'] = filemtime('.svn/wc.db');
    }

    if (! $cache) {
        $cache['lastup'] = null;
        $cache['svnrev'] = null;
        $cache['wcdb_mtime'] = null;
    }

    $cachelib->cacheItem('svn_last_update', serialize($cache));

    return $cache;
}