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class Wiki_comments_ext {
 
 public $settings   = array();
 public $description  = 'Enables comments for wiki module';
 public $docs_url  = '';
 public $name   = 'Wiki Comments';
 public $settings_exist = 'n';
 public $version   = '1.0';
 
 public $channel_id  = '';
 public $entry_id  = '';
 public $required_by  = array('module'); 
 
 private $EE;
 
 /**
  * Constructor
  *
  * @param  mixed Settings array or empty string if none exist.
  */
 public function __construct($settings = '')
 {
  $this->EE =& get_instance();
 }
 
 /**
  * add_to_content
  *
  * @param 
  * @return 
  */
 public function add_to_content($obj)
 {
    return $obj->return_data ;
 }

 private function _wiki_page_exists($url) 
 {
  return $this->EE->wiki_comments_model->wiki_page_exists($url);
 }
 
 private function _channel_exists() 
 {
  return $this->EE->wiki_comments_model->channel_exists();
 }
 
 private function _channel_title_exists($url) 
 {
  $url = $this->_validate_url_title($url);
  return  $this->EE->wiki_comments_model->channel_title_exists($url);
 }

 public function delete_content()
 {
  $this->EE->load->model('wiki_comments_model');
  $this->EE->wiki_comments_model->delete_content($this->channel_id, $this->EE->config->item('site_id'));
 }
 
 private function _create_wiki_channel()
 {
  return $this->EE->wiki_comments_model->create_wiki_channel($data);
 }

 private function _create_wiki_channel_title($url)
 {
  return  $this->EE->wiki_comments_model->create_wiki_channel_title($data);
 }

 private function _create_wiki_channel_data()
 {
  $this->EE->wiki_comments_model->create_wiki_channel_data($data);
 }
 
 private function _validate_url_title($url_title = '')
 {
  $word_separator = $this->EE->config->item('word_separator');
  
  $this->EE->load->helper('url');

  // Remove extraneous characters
  $url_title = url_title($url_title, $word_separator);
  return $url_title;
 }

 // ---------------------------------------------------------------------- 
 /**
  * Activate Extension
  *
  * This function enters the extension into the exp_extensions table
  *
  * @return void
  */
 public function activate_extension()
 {
  // Setup custom settings in this array.
  $this->settings = array();
  
  $data = array(
   'class'  => __CLASS__,
   'method' => 'add_to_content',
   'hook'  => 'wiki_start',
   'settings' => serialize($this->settings),
   'version' => $this->version,
   'enabled' => 'y'
  );

  $this->EE->db->insert('extensions', $data); 
 } 

 // ----------------------------------------------------------------------

 /**
  * Disable Extension
  *
  * This method removes information from the exp_extensions table
  *
  * @return void
  */
 function disable_extension()
 {
  $this->EE->db->where('class', __CLASS__);
  $this->EE->db->delete('extensions');
 }

 // ----------------------------------------------------------------------

 /**
  * Update Extension
  *
  * This function performs any necessary db updates when the extension
  * page is visited
  *
  * @return  mixed void on update / false if none
  */
 function update_extension($current = '')
 {
  if ($current == '' OR $current == $this->version)
  {
   return FALSE;
  }
 } 
 
 // ----------------------------------------------------------------------
}