<?php

/*

 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between

 * Copyright (C) 2006-2009 Dan Fuhry

 * log.php - Logs table parsing and displaying

 *

 * This program is Free Software; you can redistribute 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.

 *

 * 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 General Public License for details.

 */

/**

 * Front-end for showing page revisions and actions in the logs table.

 * @package Enano

 * @subpackage Frontend

 * @author Dan Fuhry <dan@enanocms.org>

 * @license GNU General Public License

 */

class LogDisplay

{

  /**

   * Criteria for the search.

   * Structure:

   <code>

   array(

       array( 'user', 'Dan' ),

       array( 'within', 86400 ),

       array( 'page', 'Main_Page' )

     )

   </code>

   * @var array

   */

  var $criteria = array();

  /**

   * Adds a criterion for the log display.

   * @param string Criterion type - user, page, or within

   * @param string Value - username, page ID, or (int) within # seconds or (string) number + suffix (suffix: d = day, w = week, m = month, y = year) ex: "1w"

   */

  public function add_criterion($criterion, $value)

  {

    switch ( $criterion )

    {

      case 'user':

      case 'page':

      case 'action':

        $this->criteria[] = array($criterion, $value);

        break;

      case 'minor':

        $this->criteria[] = array($criterion, intval($value));

        break;

      case 'within':

        if ( is_int($value) )

        {

          $this->criteria[] = array($criterion, $value);

        }

        else if ( is_string($value) )

        {

          $lastchar = substr($value, -1);

          $amt = intval($value);

          switch($lastchar)

          {

            case 'd':

              $amt = $amt * 86400;

              break;

            case 'w':

              $amt = $amt * 604800;

              break;

            case 'm':

              $amt = $amt * 2592000;

              break;

            case 'y':

              $amt = $amt * 31536000;

              break;

          }

          $this->criteria[] = array($criterion, $amt);

        }

        else

        {

          throw new Exception('Invalid value type for within');

        }

        break;

      default:

        throw new Exception('Unknown criterion type');

        break;

    }

  }

  /**

   * Build the necessary SQL query.

   * @param int Optional: offset, defaults to 0

   * @param int Optional: page size, defaults to 0; 0 = don't limit

   */

  public function build_sql($offset = 0, $page_size = 0, $just_page_count = false)

  {

    global $db, $session, $paths, $template, $plugins; // Common objects

    $where_extra = '';

    $where_bits = array(

        'user' => array(),

        'page' => array(),

        'action' => array()

      );

    foreach ( $this->criteria as $criterion )

    {

      list($type, $value) = $criterion;

      switch($type)

      {

        case 'user':

          $where_bits['user'][] = "author = '" . $db->escape(str_replace('_', ' ', $value)) . "'";

          break;

        case 'action':

          if ( $value === 'protect' )

          {

            $where_bits['action'][] = "action = 'prot'";

            $where_bits['action'][] = "action = 'unprot'";

            $where_bits['action'][] = "action = 'semiprot'";

          }

          else

          {

            $where_bits['action'][] = "action = '" . $db->escape($value) . "'";

          }

          break;

        case 'page':

          list($page_id, $namespace) = RenderMan::strToPageId($value);

          $where_bits['page'][] = "page_id = '" . $db->escape($page_id) . "' AND namespace = '" . $db->escape($namespace) . "'";

          break;

        case 'within':

          $threshold = time() - $value;

          $where_extra .= "\n    AND time_id > $threshold";

          break;

        case 'minor':

          if ( $value == 1 )

            $where_extra .= "\n    AND ( minor_edit = 1 OR action != 'edit' )";

          else

            $where_extra .= "\n    AND minor_edit != 1";

          break;

      }

    }

    if ( !empty($where_bits['user']) )

    {

      $where_extra .= "\n    AND ( " . implode(" OR ", $where_bits['user']) . " )";

    }

    if ( !empty($where_bits['page']) )

    {

      $where_extra .= "\n    AND ( (" . implode(") OR (", $where_bits['page']) . ") )";

    }

    if ( !empty($where_bits['action']) )

    {

      $where_extra .= "\n    AND ( (" . implode(") OR (", $where_bits['action']) . ") )";

    }

    if ( ENANO_DBLAYER == 'PGSQL' )

      $limit = ( $page_size > 0 ) ? "\n  LIMIT $page_size OFFSET $offset" : '';

    else

      $limit = ( $page_size > 0 ) ? "\n  LIMIT $offset, $page_size" : '';

    $sql = 'SELECT ' . $columns . ' FROM ' . table_prefix . "logs AS l\n"

         . "  WHERE log_type = 'page' AND is_draft != 1$where_extra\n"

         . "  GROUP BY log_id, action, page_id, namespace, page_text, author, time_id, edit_summary, minor_edit\n"

         . "  ORDER BY time_id DESC $limit;";

    return $sql;

  }

  /**

   * Get data!

   * @param int Offset, defaults to 0

   * @param int Page size, if 0 (default) returns entire table (danger Will Robinson!)

   * @return array

   */

  public function get_data($offset = 0, $page_size = 0)

  {

    global $db, $session, $paths, $session, $plugins; // Common objects

    $sql = $this->build_sql($offset, $page_size);

    if ( !$db->sql_query($sql) )

      $db->_die();

    $return = array();

    $deplist = array();

    $idlist = array();

    while ( $row = $db->fetchrow() )

    {

      $return[ $row['log_id'] ] = $row;

      if ( $row['action'] === 'edit' )

      {

        // This is a page revision; its parent needs to be found

        $pagekey = serialize(array($row['page_id'], $row['namespace']));

        $deplist[$pagekey] = "( page_id = '" . $db->escape($row['page_id']) . "' AND namespace = '" . $db->escape($row['namespace']) . "' AND log_id < {$row['log_id']} )";

        // if we already have a revision from this page in the dataset, we've found its parent

        if ( isset($idlist[$pagekey]) )

        {

          $child =& $return[ $idlist[$pagekey] ];

          $child['parent_size'] = $row['revision_size'];

          $child['parent_revid'] = $row['log_id'];

          $child['parent_time'] = $row['time_id'];

          unset($child);

        }

        $idlist[$pagekey] = $row['log_id'];

      }

    }

    // Second query fetches all parent revision data

    // (maybe we have no edits?? check deplist)

    if ( !empty($deplist) )

    {

      // FIXME: inefficient. damn GROUP BY for not obeying ORDER BY, it means we can't group and instead have to select

      // all previous revisions of page X and discard all but the first one we find.

      $where_extra = implode("\n    OR ", $deplist);

      $sql = 'SELECT log_id, page_id, namespace, CHAR_LENGTH(page_text) AS revision_size, time_id FROM ' . table_prefix . "logs\n"

           . "  WHERE log_type = 'page' AND action = 'edit'\n  AND ( $where_extra )\n"

           // . "  GROUP BY page_id, namespace\n"

           . "  ORDER BY log_id DESC;";

      if ( !$db->sql_query($sql) )

        $db->_die();

      while ( $row = $db->fetchrow() )

      {

        $pagekey = serialize(array($row['page_id'], $row['namespace']));

        if ( isset($idlist[$pagekey]) )

        {

          $child =& $return[ $idlist[$pagekey] ];

          $child['parent_size'] = $row['revision_size'];

          $child['parent_revid'] = $row['log_id'];

          $child['parent_time'] = $row['time_id'];

          unset($child, $idlist[$pagekey]);

        }

      }

    }

    // final iteration goes through all edits and if there's not info on the parent, sets to 0. It also calculates size change.

    foreach ( $return as &$row )

    {

      if ( $row['action'] === 'edit' && !isset($row['parent_revid']) )

      {

        $row['parent_revid'] = 0;

        $row['parent_size'] = 0;

      }

      if ( $row['action'] === 'edit' )

      {

        $row['size_delta'] = $row['revision_size'] - $row['parent_size'];

      }

    }

    return array_values($return);

  }

  /**

   * Get the number of rows that will be in the result set.

   * @return int

   */

  public function get_row_count()

  {

    global $db, $session, $paths, $session, $plugins; // Common objects

    if ( !$db->sql_query( $this->build_sql(0, 0, true) ) )

      $db->_die();

    list($count) = $db->fetchrow_num();

    return $count;

  }

  /**

   * Returns the list of criteria

   * @return array

   */

  public function get_criteria()

  {

    return $this->criteria;

  }

  /**

   * Formats a result row into pretty HTML.

   * @param array dataset from LogDisplay::get_data()

   * @param bool If true (default), shows action buttons.

   * @param bool If true (default), shows page title; good for integrated displays

   * @static

   * @return string

   */

  public static function render_row($row, $show_buttons = true, $show_pagetitle = true)

  {

    global $db, $session, $paths, $session, $plugins; // Common objects

    global $lang;

    $html = '';

    $pagekey = ( isset($paths->nslist[$row['namespace']]) ) ? $paths->nslist[$row['namespace']] . $row['page_id'] : $row['namespace'] . ':' . $row['page_id'];

    $pagekey = sanitize_page_id($pagekey);

    // diff button

    if ( $show_buttons )

    {

      if ( $row['action'] == 'edit' && !empty($row['parent_revid']) )

      {

        $html .= '(';

        $ispage = isPage($pagekey);

        if ( $ispage )

          $html .= '<a href="' . makeUrlNS($row['namespace'], $row['page_id'], "do=diff&diff1={$row['parent_revid']}&diff2={$row['log_id']}", true) . '">';

        $html .= $lang->get('pagetools_rc_btn_diff');

        if ( $ispage )

          $html .= '</a>';

        if ( $ispage )

          $html .= ', <a href="' . makeUrlNS($row['namespace'], $row['page_id'], "oldid={$row['log_id']}", true) . '">';

        $html .= $lang->get('pagetools_rc_btn_view');

        if ( $ispage )

          $html .= '</a>';

        if ( $row['parent_revid'] > 0 && isPage($pagekey) )

        {

          $html .= ', <a href="' . makeUrlNS($row['namespace'], $row['page_id'], false, true) . '#do:edit;rev:' . $row['parent_revid'] . '">' . $lang->get('pagetools_rc_btn_undo') . '</a>';

        }

        $html .= ') ';

      }

      else if ( $row['action'] != 'edit' && ( isPage($pagekey) || $row['action'] == 'delete' ) )

      {

        $html .= '(';

        $html .= '<a href="' . makeUrlNS($row['namespace'], $row['page_id'], "do=rollback&id={$row['log_id']}", true). '">' . $lang->get('pagetools_rc_btn_undo') . '</a>';

        $html .= ') ';

      }

      // hist button

      $html .= '(';

      if ( isPage($pagekey) )

      {

        $html .= '<a href="' . makeUrlNS($row['namespace'], $row['page_id'], "do=history", true) . '">';

      }

      $html .= $lang->get('pagetools_rc_btn_hist');

      if ( isPage($pagekey) )

      {

        $html .= '</a>';

      }

      $html .= ') . . ';

    }

    if ( $show_pagetitle )

    {

      // new page?

      if ( $row['action'] == 'edit' && empty($row['parent_revid']) )

      {

        $html .= '<b>N</b> ';

      }

      // minor edit?

      if ( $row['action'] == 'edit' && $row['minor_edit'] )

      {

        $html .= '<b>m</b> ';

      }

      // link to the page

      $cls = ( isPage($pagekey) ) ? '' : ' class="wikilink-nonexistent"';

      $html .= '<a href="' . makeUrlNS($row['namespace'], $row['page_id']) . '"' . $cls . '>' . htmlspecialchars(get_page_title_ns($row['page_id'], $row['namespace'])) . '</a>; ';

    }

    // date

    $today = time() - ( time() % 86400 );

    $date = MemberlistFormatter::format_date($row['time_id']) . ' ';

    $date .= date('h:i:s', $row['time_id']);

    $html .= "$date . . ";

    // size counter

    if ( $row['action'] == 'edit' )

    {

      $css = self::get_css($row['size_delta']);

      $size_change = number_format($row['size_delta']);

      if ( substr($size_change, 0, 1) != '-' )

        $size_change = "+$size_change";

      $html .= "<span style=\"$css\">({$size_change})</span>";

      $html .= ' . . ';

    }

    // link to userpage

    $html .= '(';

    $html .= $lang->get('pagetools_rc_btn_pm');

    $html .= '</a>, ';

    $html .= $lang->get('pagetools_rc_btn_usertalk');

    $html .= '</a>';

    $html .= ') . . ';

    // Edit summary

    if ( $row['action'] == 'edit' )

    {

      $html .= '<i>(';

      if ( empty($row['edit_summary']) )

      {

        $html .= '<span style="color: #808080;">' . $lang->get('history_summary_none_given') . '</span>';

      }

      else

      {

        $html .= RenderMan::parse_internal_links(htmlspecialchars($row['edit_summary']));

      }

      $html .= ')</i>';

    }

    else

    {

      switch($row['action'])

      {

        default:

          $html .= $row['action'];

          break;

        case 'rename':

          $html .= $lang->get('log_action_rename', array('old_name' => htmlspecialchars($row['edit_summary'])));

          break;

        case 'create':

          $html .= $lang->get('log_action_create');

          break;

        case 'votereset':

          $html .= $lang->get('log_action_votereset', array('num_votes' => $row['edit_summary'], 'plural' => ( intval($row['edit_summary']) == 1 ? '' : $lang->get('meta_plural'))));

          break;

        case 'prot':

        case 'unprot':

        case 'semiprot':

        case 'delete':

        case 'reupload':

          $stringmap = array(

            'prot' => 'log_action_protect_full',

            'unprot' => 'log_action_protect_none',

            'semiprot' => 'log_action_protect_semi',

            'delete' => 'log_action_delete',

            'reupload' => 'log_action_reupload'

          );

        if ( $row['edit_summary'] === '__REVERSION__' )

          $reason = '<span style="color: #808080;">' . $lang->get('log_msg_reversion') . '</span>';

        else if ( $row['action'] == 'reupload' && $row['edit_summary'] === '__ROLLBACK__' )

          $reason = '<span style="color: #808080;">' . $lang->get('log_msg_file_restored') . '</span>';

        else

          $reason = ( !empty($row['edit_summary']) ) ? htmlspecialchars($row['edit_summary']) : '<span style="color: #808080;">' . $lang->get('log_msg_no_reason_provided') . '</span>';

        $html .= $lang->get($stringmap[$row['action']], array('reason' => $reason));

      }

    }

    return $html;

  }

  /**

   * Return CSS blurb for size delta

   * @return string

   * @static

   * @access private

   */

  private static function get_css($change_size)

  {

    // Hardly changed at all? Return a gray

    if ( $change_size <= 5 && $change_size >= -5 )

      return 'color: #808080;';

    // determine saturation based on size of change (1-500 bytes)

    $change_abs = abs($change_size);

    $index = 0x70 * ( $change_abs / 500 );

    if ( $index > 0x70 )

      $index = 0x70;

    $index = $index + 0x40;

    $index = dechex($index);

    if ( strlen($index) < 2 )

      $index = "0$index";

    $css = ( $change_size > 0 ) ? "color: #00{$index}00;" : "color: #{$index}0000;";

    if ( $change_abs > 500 )

      $css .= ' font-weight: bold;';

    return $css;

  }

}

?>