<?php
// +-----------------------------------------------------------------------+
// | PhpWebGallery - a PHP based picture gallery                           |
// | Copyright (C) 2006-2007 PhpWebGallery Team - http://phpwebgallery.net |
// +-----------------------------------------------------------------------+
// | branch        : BSF (Best So Far)
// | file          : $Id$
// | last update   : $Date$
// | last modifier : $Author$
// | revision      : $Revision$
// +-----------------------------------------------------------------------+
// | This program 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                                          |
// |                                                                       |
// | 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 more details.                              |
// |                                                                       |
// | You should have received a copy of the GNU General Public License     |
// | along with this program; if not, write to the Free Software           |
// | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
// | USA.                                                                  |
// +-----------------------------------------------------------------------+

// global variable for filter
$filter = array();

// $filter['enabled']: Filter is enabled
// $filter['categories']: Computed data of filtered categories
// $filter['visible_categories']: List of visible categories (count(visible) < count(forbidden) more often)
// $filter['visible_images']: List of visible images

$filter['enabled'] = false;

if (in_array(script_basename(), $conf['filter_pages']))
{ // valid only on certain pages
  if (isset($_GET['filter']))
  {
    $filter['enabled'] = ($_GET['filter'] == 'start');
    if ( !$filter['enabled'] )
    {
      pwg_unset_session_var('filter_enabled');
      pwg_unset_session_var('filter_check_key');
      pwg_unset_session_var('filter_categories');
      pwg_unset_session_var('filter_visible_categories');
      pwg_unset_session_var('filter_visible_images');
    }
  }
  else
  {
    $filter['enabled'] = pwg_get_session_var('filter_enabled', false);
  }

  if ($filter['enabled'])
  {
    if (
        // New filter
        !pwg_get_session_var('filter_enabled', false) or
        // Cache data updated
        $user['need_update_done'] or
        // Date, period, user are changed
        (pwg_get_session_var('filter_check_key', '') != get_filter_check_key())
      )
    {
      // Need to compute dats
      $filter['check_key'] = get_filter_check_key();
      $filter['categories'] = get_computed_categories($user['id'], $user['forbidden_categories'], true, $user['recent_period']);

      $filter['visible_categories'] = implode(',', array_keys($filter['categories']));
      if (empty($filter['visible_categories']))
      {
        // Must be not empty
        $filter['visible_categories'] = -1;
      }

      $query ='
SELECT DISTINCT(image_id)
  FROM '.
    IMAGE_CATEGORY_TABLE.' INNER JOIN '.IMAGES_TABLE.' ON image_id = id
  WHERE ';
      if (!empty($filter['visible_categories']))
      {
      $query.= '
  category_id  IN ('.$filter['visible_categories'].') AND';
      }
      $query.= '
  date_available  > SUBDATE(
        CURRENT_DATE,INTERVAL '.$user['recent_period'].' DAY)';

      $filter['visible_images'] = implode(',', array_from_query($query, 'image_id'));

      if (empty($filter['visible_images']))
      {
        // Must be not empty
        $filter['visible_images'] = -1;
      }

      pwg_set_session_var('filter_enabled', $filter['enabled']);
      pwg_set_session_var('filter_check_key', $filter['check_key']);
      pwg_set_session_var('filter_categories', serialize($filter['categories']));
      pwg_set_session_var('filter_visible_categories', $filter['visible_categories']);
      pwg_set_session_var('filter_visible_images', $filter['visible_images']);
    }
    else
    {
      // Read only data
      $filter['check_key'] = pwg_get_session_var('filter_check_key', '');
      $filter['categories'] = unserialize(pwg_get_session_var('filter_categories', serialize(array())));
      $filter['visible_categories'] = pwg_get_session_var('filter_visible_categories', '');
      $filter['visible_images'] = pwg_get_session_var('filter_visible_images', '');
    }
    $header_notes[] = l10n_dec('note_filter_day', 'note_filter_days', $user['recent_period']);
  } // end if filter enabled
} // end if script_basename ...
?>