<?PHP
  require_once('code/xmlparser.inc.php');
  require_once('code/db.inc.php');
  
  function require_mod($file) {
    if(isset($GLOBALS['modules']->code[$file]))
      require_once($GLOBALS['modules']->code[$file]);
    elseif(isset($GLOBALS['modules']->templates[$file]))
      require_once($GLOBALS['modules']->templates[$file]);
    else
      require_once($file);
  }
  
  class Modules {
    var $modules = array();
    var $pages = array();
    var $code = array();
    var $templates = array();
    
    function Modules() {
      $dir = opendir('modules');
      
      while($moddir = readdir($dir)) {
        if($moddir[0] != '.' && is_dir('modules/' . $moddir) && is_file('modules/' . $moddir . '/module.xml')) {
          $data = $GLOBALS['xmlparser']->ParseFile('modules/' . $moddir . '/module.xml');
          
          if(!$data) continue;
          
          $info = $GLOBALS['xmlparser']->FindTag($data, 'info');
          if(!$info) continue;
          
          $name = $GLOBALS['xmlparser']->FindTag($info, 'name');
          if(!$name) continue;
          if(count($name['children']) != 1) continue;
          if(!is_string($name['children'][0])) continue;
          $name = $name['children'][0];
          
          $version = $GLOBALS['xmlparser']->FindTag($info, 'version');
          if(!$version) continue;
          if(count($version['children']) != 1) continue;
          if(!is_string($version['children'][0])) continue;
          $version = $version['children'][0];
          
          $desc = $GLOBALS['xmlparser']->FindTag($info, 'desc');
          if(!$desc) continue;
          if(count($desc['children']) != 1) continue;
          if(!is_string($desc['children'][0])) continue;
          $desc = $desc['children'][0];
          
          $this->modules[$name] = array('name' => $name, 'version' => $version, 'desc' => $desc, 'code' => array(),
                                        'templates' => array(), 'config' => false, 'enabled' => false);
          
          if($GLOBALS['xmlparser']->FindTag($info, 'config')) $this->modules[$name]['config'] = true;
          
          $files = $GLOBALS['xmlparser']->FindTag($data, 'files');
          if(!$files) continue;
          
          foreach($files['children'] as $file) {
            if(!is_array($file)) continue;
            if(count($file['children']) != 1) continue;
            if(!is_string($file['children'][0])) continue;
            
            switch($file['tag']) {
              case 'page':
                $type = $file['attribs']['type'];
                if(!$type) $type = 'c';
                
                $pagename =  $file['children'][0] . '.' . $type;
                $realname = 'modules/' . $moddir . '/pages/' . strtr($type, array('c' => 'content', 'e' => 'editor', 'n' => 'nav'))
                          . '/' . $file['children'][0] . '.xml';
                
                $this->modules[$name]['pages'][$pagename] = $realname;
                break;
              case 'code':
                $filename = 'code/' . $file['children'][0] . '.inc.php';
                $realname = 'modules/' . $moddir . '/code/' . $file['children'][0] . '.inc.php';
                
                $this->modules[$name]['code'][$filename] = $realname;
                break;
              case 'template':
                $filename = 'templates/' . $file['children'][0] . '.inc.php';
                $realname = 'modules/' . $moddir . '/templates/' . $file['children'][0] . '.inc.php';
                
                $this->modules[$name]['templates'][$filename] = $realname;
            }
          }
        }
      }
      
      closedir($dir);
      
      $res = $GLOBALS['db']->Execute('SELECT name, enabled FROM modules');
      
      while($row = $res->FetchRow()) {
        if(!array_key_exists($row[0], $this->modules)) {
          $GLOBALS['db']->Execute('DELETE FROM modules WHERE name = ?', $row[0]);
          continue;
        }
        
        if(!$row[1]) continue;
        
        $this->modules[$row[0]]['enabled'] = true;
        
        $this->pages = array_merge($this->pages, $this->modules[$row[0]]['pages']);
        $this->code = array_merge($this->code, $this->modules[$row[0]]['code']);
        $this->templates = array_merge($this->templates, $this->modules[$row[0]]['templates']);
      }
    }
    
    function Exists($name) {
      return array_key_exists($name, $this->modules);
    }
    
    function Enabled($name) {
      return $this->Exists($name) && $this->modules[$name]['enabled'];
    }
    
    function HasConfig($name) {
      if(!$this->Exists($name)) return false;
      
      return $this->modules[$name]['config'];
    }
    
    function Enable($name, $enable = true) {
      if(!$this->Exists($name)) return false;
      
      if($this->Enabled($name) == $enable) return true;
      
      $res = $GLOBALS['db']->Execute('SELECT id FROM modules WHERE name = ?', $name);
      
      if($res->RecordCount()) {
        $GLOBALS['db']->Execute('UPDATE modules SET enabled = ? WHERE name = ?', array(intval($enable), $name));
      
        return ($GLOBALS['db']->Affected_Rows() > 0);
      }
      
      $GLOBALS['db']->Execute('INSERT INTO modules (name, enabled) VALUES (?, ?)', array($name, intval($enable)));
      
      return ($GLOBALS['db']->Affected_Rows() > 0);
    }
    
    function Disable($name) {
      return $this->Enable($name, false);
    }
  }
  
  $GLOBALS['modules'] = new Modules;
?>