<?php

/**
 * Copyright 1999,2005,2006 $ThePhpWikiProgrammingTeam
 *
 * This file is part of PhpWiki.
 *
 * PhpWiki is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * PhpWiki 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with PhpWiki; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

/**
 * Backend for handling file storage as pure, readable flatfiles,
 * as with PageDump. All other methods are taken from file, which
 * handles serialized pages.
 *   latest version_data is it page_data/
 *   previous ver_data is at ver_data/
 *   latest_ver should not be needed (todo)
 *
 * Author: Reini Urban, based on the file backend by Jochen Kalmbach
 */

require_once 'lib/WikiDB/backend/file.php';
require_once 'lib/loadsave.php';

class WikiDB_backend_flatfile
    extends WikiDB_backend_file
{
    // *********************************************************************
    // common file load / save functions:
    // FilenameForPage is from loadsave.php
    function _pagename2filename($type, $pagename, $version)
    {
        $fpagename = FilenameForPage($pagename);
        if (strstr($fpagename, "/")) {
            $fpagename = preg_replace("/\//", "%2F", $fpagename);
        }
        return $this->_dir_names[$type] . '/' . $fpagename;
        /*      if ($version == 0)
                     return $this->_dir_names[$type].'/'.FilenameForPage($pagename);
                 else
                     return $this->_dir_names[$type].'/'.FilenameForPage($pagename).'--'.$version;
        */
    }

    // Load/Save Page-Data
    function _loadPageData($pagename)
    {
        if ($this->_page_data != NULL) {
            if ($this->_page_data['pagename'] == $pagename) {
                return $this->_page_data;
            }
        }
        //$pd = $this->_loadPage('page_data', $pagename, 0);

        $filename = $this->_pagename2filename('page_data', $pagename, 0);
        if (!file_exists($filename)) return NULL;
        if (!filesize($filename)) return array();
        if ($fd = @fopen($filename, "rb")) {
            $locked = flock($fd, 1); // Read lock
            if (!$locked) {
                ExitWiki("Timeout while obtaining lock. Please try again");
            }
            if ($data = fread($fd, filesize($filename))) {
                // This is the only difference from file:
                if ($parts = ParseMimeifiedPages($data)) {
                    $pd = $parts[0];
                }
                //if ($set_pagename == true)
                $pd['pagename'] = $pagename;
                //if ($version != 0) $pd['version'] = $version;
                if (!is_array($pd))
                    ExitWiki(sprintf(gettext("'%s': corrupt file"),
                        htmlspecialchars($filename)));
            }
            fclose($fd);
        }

        if ($pd != NULL)
            $this->_page_data = $pd;
        if ($this->_page_data != NULL) {
            if ($this->_page_data['pagename'] == $pagename) {
                return $this->_page_data;
            }
        }
        return array(); // no values found
    }

    /** Store latest version as full page_data flatfile,
     *    earlier versions as file backend ver_data.
     * _cached_html will not be stored.
     * If the given ($pagename,$version) is already in the database,
     * this method completely overwrites any stored data for that version.
     */
    function _saveVersionData($pagename, $version, $data)
    {
        // check if this is a newer version:
        if ($this->_getLatestVersion($pagename) < $version) {
            // write new latest-version-info
            $this->_setLatestVersion($pagename, $version);
            // save it as latest page, not serialized version hash
            // TODO: load latest version data and merge it with new pagedata
            $this->_savePageData($pagename, array('versiondata' => $data));
        } else { // save/update old version data hash
            $this->_savePage('ver_data', $pagename, $version, $data);
        }
    }

    // This is different to file and not yet finished.
    // TODO: fields not being saved as page_data should be saved to ver_data
    // Store as full page_data flatfile
    //   pagedata: date, pagename, hits
    //   versiondata: _cached_html and the rest
    function _savePageData($pagename, $data)
    {

        $type = 'page_data';
        $version = 1;
        $filename = $this->_pagename2filename($type, $pagename, $version);

        // Construct a dummy page_revision object
        $page = new WikiDB_Page($this->_wikidb, $pagename);
        // data may be pagedate or versiondata updates
        if (USECACHE and empty($data['pagedata'])) {
            $cache =& $this->_wikidb->_cache;
            if (!empty($cache->_pagedata_cache[$pagename])
                and is_array($cache->_pagedata_cache[$pagename])
            ) {
                $cachedata = &$cache->_pagedata_cache[$pagename];
                foreach ($data as $key => $val)
                    $cachedata[$key] = $val;
            } else {
                $cache->_pagedata_cache[$pagename] = $data;
            }
        }
        //unset ($data['pagedata']);
        //if (empty($data['versiondata']))
        //    $data['versiondata'] = $data;
        // TODO:
        //   with versiondata merge it with previous pagedata, not to overwrite with empty pagedata
        //   with pagedata merge it with previous versiondata, not to overwrite with empty versiondata (content)
        $olddata = $this->_loadPageData($pagename);
        if (isset($data['version'])) {
            $version = $data['version'];
            $latestversion = $this->_getLatestVersion($pagename);
            if ($latestversion < $version) {
                $oldversiondata = $this->_loadVersionData($pagename, $latestversion);
                if ($oldversiondata)
                    $olddata['versiondata'] = array_merge($oldversiondata, $olddata['versiondata']);
            }
        }
        $data['pagedata'] = array_merge($olddata['pagedata'], $data['pagedata']);
        $data['versiondata'] = array_merge($olddata['versiondata'], $data['versiondata']);
        if (empty($data['versiondata']['%content']))
            $data['versiondata']['%content'] = $olddata['content'];
        $current = new WikiDB_PageRevision($this->_wikidb, $pagename, $version, $data['versiondata']);
        unset ($data['versiondata']);
        foreach ($data as $k => $v) {
            if ($k == 'pagedata')
                $current->_data = array_merge($current->_data, $v);
            elseif ($k == 'versiondata')
                $current->_data = array_merge($current->_data, $v); else
                $current->_data[$k] = $v;
        }
        $this->_page_data = $current->_data;
        $pagedata = "Date: " . Rfc2822DateTime($current->get('mtime')) . "\r\n";
        $pagedata .= sprintf("Mime-Version: 1.0 (Produced by PhpWiki %s)\r\n",
            PHPWIKI_VERSION);
        $pagedata .= MimeifyPageRevision($page, $current);

        if ($fd = fopen($filename, 'a+b')) {
            $locked = flock($fd, 2); // Exclusive blocking lock
            if (!$locked) {
                ExitWiki("Timeout while obtaining lock. Please try again");
            }
            rewind($fd);
            ftruncate($fd, 0);
            $len = strlen($pagedata);
            $num = fwrite($fd, $pagedata, $len);
            assert($num == $len);
            fclose($fd);
        } else {
            ExitWiki("Error while writing page '$pagename'");
        }
    }
}

;

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