<?php

/*

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

 * Copyright (C) 2006-2008 Dan Fuhry

 *

 * 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.

 */

function page_Admin_ThemeManager($force_no_json = false)

{

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

  global $lang;

  if ( $session->auth_level < USER_LEVEL_ADMIN || $session->user_level < USER_LEVEL_ADMIN )

  {

    $login_link = makeUrlNS('Special', 'Login/' . $paths->nslist['Special'] . 'Administration', 'level=' . USER_LEVEL_ADMIN, true);

    echo '<h3>' . $lang->get('adm_err_not_auth_title') . '</h3>';

    echo '<p>' . $lang->get('adm_err_not_auth_body', array( 'login_link' => $login_link )) . '</p>';

    return;

  }

  $system_themes =& $template->system_themes;

  // Obtain the list of themes (both available and already installed) and the styles available for each

  $dh = @opendir(ENANO_ROOT . '/themes');

  if ( !$dh )

    die('Couldn\'t open themes directory');

  $themes = array();

  while ( $dr = @readdir($dh) )

  {

    if ( $dr == '.' || $dr == '..' )

      continue;

    if ( !is_dir(ENANO_ROOT . "/themes/$dr") )

      continue;

    if ( !file_exists(ENANO_ROOT . "/themes/$dr/theme.cfg") || !is_dir(ENANO_ROOT . "/themes/$dr/css") )

      continue;

    $cdh = @opendir(ENANO_ROOT . "/themes/$dr/css");

    if ( !$cdh )

      continue;

    require(ENANO_ROOT . "/themes/$dr/theme.cfg");

    global $theme;

    $themes[$dr] = array(

        'css' => array(),

        'theme_name' => $theme['theme_name']

      );

    while ( $cdr = @readdir($cdh) )

    {

      if ( $cdr == '.' || $cdr == '..' )

        continue;

      if ( preg_match('/\.css$/i', $cdr) )

        $themes[$dr]['css'][] = substr($cdr, 0, -4);

    }

  }

  // Decide which themes are not installed

  $installable = array_flip(array_keys($themes));

  // FIXME: sanitize directory names or check with preg_match()

  $where_clause = 'theme_id = \'' . implode('\' OR theme_id = \'', array_flip($installable)) . '\'';

  $q = $db->sql_query('SELECT theme_id, theme_name, enabled FROM ' . table_prefix . "themes WHERE $where_clause;");

  if ( !$q )

    $db->_die();

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

  {

    $tid =& $row['theme_id'];

    unset($installable[$tid]);

    $themes[$tid]['theme_name'] = $row['theme_name'];

    $themes[$tid]['enabled'] = ( $row['enabled'] == 1 );

  }

  foreach ( $system_themes as $st )

  {

    unset($installable[$st]);

  }

  $installable = array_flip($installable);

  // AJAX code

  if ( $paths->getParam(0) === 'action.json' && !$force_no_json )

  {

    return ajaxServlet_Admin_ThemeManager($themes);

  }

  // List installed themes

  ?>

  <div style="float: right;">

    <a href="#" id="systheme_toggler" onclick="ajaxToggleSystemThemes(); return false;"><?php echo $lang->get('acptm_btn_system_themes_show'); ?></a>

  </div>

  <?php

  echo '<h3>' . $lang->get('acptm_heading_edit_themes') . '</h3>';

  echo '<div id="theme_list_edit">';

  foreach ( $themes as $theme_id => $theme_data )

  {

    if ( in_array($theme_id, $installable) )

      continue;

    if ( file_exists(ENANO_ROOT . "/themes/$theme_id/preview.png") )

    {

      $preview_path = scriptPath . "/themes/$theme_id/preview.png";

    }

    else

    {

      $preview_path = scriptPath . "/images/themepreview.png";

    }

    $d = ( @$theme_data['enabled'] ) ? '' : ' themebutton_theme_disabled';

    $st = ( in_array($theme_id, $system_themes) ) ? ' themebutton_theme_system' : '';

    echo '<div class="themebutton' . $st . '' . $d . '" id="themebtn_edit_' . $theme_id . '" style="background-image: url(' . $preview_path . ');">';

    if ( in_array($theme_id, $system_themes) )

    {

      echo   '<a class="tb-inner" href="#" onclick="return false;">

                ' . $lang->get('acptm_btn_theme_system') . '

                <span class="themename">' . htmlspecialchars($theme_data['theme_name']) . '</span>

              </a>';

    }

    else

    {

      echo   '<a class="tb-inner" href="#" onclick="ajaxEditTheme(\'' . $theme_id . '\'); return false;">

                ' . $lang->get('acptm_btn_theme_edit') . '

                <span class="themename">' . htmlspecialchars($theme_data['theme_name']) . '</span>

              </a>';

    }

    echo '</div>';

  }

  echo '</div>';

  echo '<span class="menuclear"></span>';

  if ( count($installable) > 0 )

  {

    echo '<h3>' . $lang->get('acptm_heading_install_themes') . '</h3>';

    echo '<div id="theme_list_install">';

    foreach ( $installable as $i => $theme_id )

    {

      if ( file_exists(ENANO_ROOT . "/themes/$theme_id/preview.png") )

      {

        $preview_path = scriptPath . "/themes/$theme_id/preview.png";

      }

      else

      {

        $preview_path = scriptPath . "/images/themepreview.png";

      }

      echo '<div class="themebutton" id="themebtn_install_' . $theme_id . '" enano:themename="' . htmlspecialchars($themes[$theme_id]['theme_name']) . '" style="background-image: url(' . $preview_path . ');">';

      echo   '<a class="tb-inner" href="#" onclick="ajaxInstallTheme(\'' . $theme_id . '\'); return false;">

                ' . $lang->get('acptm_btn_theme_install') . '

                <span class="themename">' . htmlspecialchars($themes[$theme_id]['theme_name']) . '</span>

              </a>';

      echo '</div>';

    }

    echo '</div>';

    echo '<span class="menuclear"></span>';

  }

}

function ajaxServlet_Admin_ThemeManager(&$themes)

{

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

  global $lang;

  if ( $session->auth_level < USER_LEVEL_ADMIN || $session->user_level < USER_LEVEL_ADMIN )

  {

    $login_link = makeUrlNS('Special', 'Login/' . $paths->nslist['Special'] . 'Administration', 'level=' . USER_LEVEL_ADMIN, true);

    echo '<h3>' . $lang->get('adm_err_not_auth_title') . '</h3>';

    echo '<p>' . $lang->get('adm_err_not_auth_body', array( 'login_link' => $login_link )) . '</p>';

    return;

  }

  if ( !isset($_POST['r']) )

    return false;

  try

  {

    $request = enano_json_decode($_POST['r']);

  }

  catch ( Exception $e )

  {

    die('Exception in JSON parser, probably invalid input.');

  }

  if ( !isset($request['mode']) )

  {

    die('No mode specified in JSON request.');

  }

  switch ( $request['mode'] )

  {

    case 'fetch_theme':

      $theme_id = $db->escape($request['theme_id']);

      if ( empty($theme_id) )

        die('Invalid theme_id');

      $q = $db->sql_query("SELECT theme_id, theme_name, default_style, enabled, group_policy, group_list FROM " . table_prefix . "themes WHERE theme_id = '$theme_id';");

      if ( !$q )

        $db->die_json();

      if ( $db->numrows() < 1 )

        die('BUG: no theme with that theme_id installed.');

      $row = $db->fetchrow();

      $row['enabled'] = ( $row['enabled'] == 1 );

      $row['css'] = @$themes[$theme_id]['css'];

      $row['default_style'] = preg_replace('/\.css$/', '', $row['default_style']);

      $row['is_default'] = ( getConfig('theme_default') === $theme_id );

      $row['group_list'] = ( empty($row['group_list']) ) ? array() : enano_json_decode($row['group_list']);

      // Build a list of group names

      $row['group_names'] = array();

      $q = $db->sql_query('SELECT group_id, group_name FROM ' . table_prefix . 'groups;');

      if ( !$q )

        $db->die_json();

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

      {

        $row['group_names'][ intval($gr['group_id']) ] = $gr['group_name'];

      }

      $db->free_result();

      // Build a list of usernames

      $row['usernames'] = array();

      foreach ( $row['group_list'] as $el )

      {

        if ( !preg_match('/^u:([0-9]+)$/', $el, $match) )

          continue;

        $uid =& $match[1];

        $q = $db->sql_query('SELECT username FROM ' . table_prefix . "users WHERE user_id = $uid;");

        if ( !$q )

          $db->die_json();

        if ( $db->numrows() < 1 )

        {

          $db->free_result();

          continue;

        }

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

        $row['usernames'][$uid] = $username;

        $db->free_result();

      }

      echo enano_json_encode($row);

      break;

    case 'uid_lookup':

      $username = @$request['username'];

      if ( empty($username) )

      {

        die(enano_json_encode(array(

            'mode' => 'error',

            'error' => $lang->get('acptm_err_invalid_username')

          )));

      }

      $username = $db->escape(strtolower($username));

      $q = $db->sql_query('SELECT user_id, username FROM ' . table_prefix . "users WHERE " . ENANO_SQLFUNC_LOWERCASE . "(username) = '$username';");

      if ( !$q )

        $db->die_json();

      if ( $db->numrows() < 1 )

      {

        die(enano_json_encode(array(

            'mode' => 'error',

            'error' => $lang->get('acptm_err_username_not_found')

          )));

      }

      list($uid, $username_real) = $db->fetchrow_num();

      $db->free_result();

      echo enano_json_encode(array(

          'uid' => $uid,

          'username' => $username_real

        ));

      break;

    case 'save_theme':

      if ( !isset($request['theme_data']) )

      {

        die(enano_json_encode(array(

            'mode' => 'error',

            'error' => 'No theme data in request'

          )));

      }

      $theme_data =& $request['theme_data'];

      // Perform integrity check on theme data

      $chk_theme_exists = isset($themes[@$theme_data['theme_id']]);

      $theme_data['theme_name'] = trim(@$theme_data['theme_name']);

      $chk_name_good = !empty($theme_data['theme_name']);

      $chk_policy_good = in_array(@$theme_data['group_policy'], array('allow_all', 'whitelist', 'blacklist'));

      $chk_grouplist_good = true;

      foreach ( $theme_data['group_list'] as $acl_entry )

      {

        if ( !preg_match('/^(u|g):[0-9]+$/', $acl_entry) )

        {

          $chk_grouplist_good = false;

          break;

        }

      }

      $chk_style_good = @in_array(@$theme_data['default_style'], @$themes[@$theme_data['theme_id']]['css']);

      if ( !$chk_theme_exists || !$chk_name_good || !$chk_policy_good || !$chk_grouplist_good || !$chk_style_good )

      {

        die(enano_json_encode(array(

            'mode' => 'error',

            'error' => $lang->get('acptm_err_save_validation_failed')

          )));

      }

      $enable = ( $theme_data['enabled'] ) ? '1' : '0';

      $theme_default = getConfig('theme_default');

      $warn_default = ( $theme_default === $theme_data['theme_id'] || $theme_data['make_default'] ) ?

                        ' ' . $lang->get('acptm_warn_access_with_default') . ' ' :

                        ' ';

      if ( $enable == 0 && ( $theme_default === $theme_data['theme_id'] || $theme_data['make_default'] ) )

      {

        $enable = '1';

        $warn_default .= '<b>' . $lang->get('acptm_warn_cant_disable_default') . '</b>';

      }

      // We're good. Update the theme...

      $q = $db->sql_query('UPDATE ' . table_prefix . 'themes SET

                               theme_name = \'' . $db->escape($theme_data['theme_name']) . '\',

                               default_style = \'' . $db->escape($theme_data['default_style']) . '\',

                               group_list = \'' . $db->escape(enano_json_encode($theme_data['group_list'])) . '\',

                               group_policy = \'' . $db->escape($theme_data['group_policy']) . '\',

                               enabled = ' . $enable . '

                             WHERE theme_id = \'' . $db->escape($theme_data['theme_id']) . '\';');

      if ( !$q )

        $db->die_json();

      if ( $theme_data['make_default'] )

      {

        setConfig('theme_default', $theme_data['theme_id']);

      }

      echo '<div class="info-box"><b>' . $lang->get('acptm_msg_save_success') . '</b>' . $warn_default . '</div>';

      page_Admin_ThemeManager(true);

      break;

    case 'install':

      $theme_id =& $request['theme_id'];

      if ( !isset($themes[$theme_id]) )

      {

        die(enano_json_encode(array(

            'mode' => 'error',

            'error' => 'Theme was deleted from themes/ directory or couldn\'t read theme metadata from filesystem'

          )));

      }

      if ( !isset($themes[$theme_id]['css'][0]) )

      {

        die(enano_json_encode(array(

            'mode' => 'error',

            'error' => 'Theme doesn\'t have any files in css/, thus it can\'t be installed. (translators: l10n?)'

          )));

      }

      // build dataset

      $theme_name = $db->escape($themes[$theme_id]['theme_name']);

      $default_style = $db->escape($themes[$theme_id]['css'][0]);

      $theme_id = $db->escape($theme_id);

      // insert it

      $q = $db->sql_query('INSERT INTO ' . table_prefix . "themes(theme_id, theme_name, default_style, enabled, group_list, group_policy)\n"

                        . "  VALUES( '$theme_id', '$theme_name', '$default_style', 1, '[]', 'allow_all' );");

      if ( !$q )

        $db->die_json();

      // The response isn't processed unless it's in JSON.

      echo 'Roger that, over and out.';

      break;

    case 'uninstall':

      $theme_id =& $request['theme_id'];

      $theme_default = getConfig('theme_default');

      // Validation

      if ( !isset($themes[$theme_id]) )

      {

        die(enano_json_encode(array(

            'mode' => 'error',

            'error' => 'Theme was deleted from themes/ directory or couldn\'t read theme metadata from filesystem'

          )));

      }

      if ( $theme_id == $theme_default )

      {

        die(enano_json_encode(array(

            'mode' => 'error',

            'error' => $lang->get('acptm_err_uninstalling_default')

          )));

      }

      if ( $theme_id == 'oxygen' )

      {

        die(enano_json_encode(array(

            'mode' => 'error',

            'error' => $lang->get('acptm_err_uninstalling_oxygen')

          )));

      }

      $theme_id = $db->escape($theme_id);

      $q = $db->sql_query('DELETE FROM ' . table_prefix . "themes WHERE theme_id = '$theme_id';");

      if ( !$q )

        $db->die_json();

      // Change all the users that were on that theme to the default

      $default_style = $template->named_theme_list[$theme_default]['default_style'];

      $default_style = preg_replace('/\.css$/', '', $default_style);

      $theme_default = $db->escape($theme_default);

      $default_style = $db->escape($default_style);

      $q = $db->sql_query('UPDATE ' . table_prefix . "users SET theme = '$theme_default', style = '$default_style' WHERE theme = '$theme_id';");

      if ( !$q )

        $db->die_json();

      echo '<div class="info-box">' . $lang->get('acptm_msg_uninstall_success') . '</div>';

      page_Admin_ThemeManager(true);

      break;

  }

}