class Towfiq_Person {
    static function on_load() {
     add_action('init',array(__CLASS__,'init'));
add_action('wp_insert_post',array(__CLASS__,'wp_insert_post'),10,2);
add_action('profile_update',array(__CLASS__,'profile_update'),10,2);
add_action('user_register',array(__CLASS__,'profile_update'));
add_filter('author_link',array(__CLASS__,'author_link'),10,2);
add_filter('get_the_author_url',array(__CLASS__,'author_link'),10,2);
}
static function init() {
register_post_type('towfiq-person',
  array(
    'labels'          => array('name'=>'People','singular_name'=>'Person'),
    'public'          => true,
    'show_ui'         => true,
    'rewrite'         => array('slug' => 'people'),
    'hierarchical'    => false,
    //'supports'        => array('title','editor','custom-fields'),
  )
);
}
static function get_email_key() {
return apply_filters( 'person_email_key', '_email' );
}
 static function profile_update($user_id,$old_user_data=false) {
 global $wpdb;
 $is_new_person = false;
 $user = get_userdata($user_id);
 $user_email = ($old_user_data ? $old_user_data->user_email : $user->user_email);
$email_key = self::get_email_key();
$person_id = $wpdb->get_var($wpdb->prepare("SELECT post_id FROM {$wpdb->postmeta} WHERE     meta_key='%s' AND meta_value='%s'",$email_key,$user_email));
  if (!is_numeric($person_id)) {
   $person_id = $is_new_person = wp_insert_post(array(
    'post_type' => 'towfiq-person',
    'post_status' => 'publish',   // Maybe this should be pending or draft?
    'post_title' => $user->display_name,
  ));
}
 update_user_meta($user_id,'_person_id',$person_id);
 update_post_meta($person_id,'_user_id',$user_id);
 if ($is_new_person || ($old_user_data && $user->user_email!=$old_user_data-  >user_email)) {
  update_post_meta($person_id,$email_key,$user->user_email);
  }
  }
   static function wp_insert_post($person_id,$person) {
    if ($person->post_type=='towfiq-person') {
    $email = get_post_meta($person_id,self::get_email_key(),true);
    if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
    $user = get_user_by('email',$email);
    if ($user) { // Associate the user IF there is an user with the same email address
      update_user_meta($user->ID,'_person_id',$person_id);
      update_post_meta($person_id,'_user_id',$user->ID);
      } else {
      delete_post_meta($person_id,'_user_id');
      }
     }
    }
   }
   static function get_user_id($person_id) {
   return get_user_meta($user_id,'_user_id',true);
    }
  static function get_user($person_id) {
  $user_id = self::get_user_id($person_id);
   return get_userdata($user_id);
   }
  static function get_person_id($user_id) {
  return get_user_meta($user_id,'_person_id',true);
  }
  static function get_person($user_id) {
  $person_id = self::get_person_id($user_id);
  return get_post($person_id);
  }
  static function author_link($permalink, $user_id) {
  $author_id = get_user_meta($user_id,'_person_id',true);
  if ($author_id) // If an associate is found, use it
  $permalink = get_post_permalink($author_id);
  return $permalink;
  }
  }
  Towfiq_Person::on_load();