/**
 * Submit the image upload form in the Avatar Selection administration page.
 *
 * @param $form
 *   General variable used in drupal, defining the structure & the fields of a
 *   form.
 * @param &$form_state
 *   General reference, used to control the processing of the form.
 */
function avatar_selection_upload_form_submit($form, &$form_state) {
  $op = $form_state['values']['op'];

  if ($op == t('Upload')) {
    // Get access settings.
    $access = array_keys(array_filter($form_state['values']['access']));
//    $og = array();
//    if (module_exists('og')) {
//      $og = array_keys(array_filter($form_state['values']['og_access']));
//    }
    $name = $form_state['values']['avatar_name'];
    $weight = $form_state['values']['avatar_weight'];

    // Scan for new files.
    if ($form_state['values']['scan_avatars'] == 1) {
      $count = _avatar_selection_scan_images($name, $access, /*$og, */$weight);
      drupal_set_message(t('Scan complete: %added new avatars found. %deleted avatars removed.', array('%added' => $count['add'], '%deleted' => $count['delete'])));
    }

    // Save uploaded files.
    $dir = file_build_uri('avatar_selection');
    $is_writable = file_prepare_directory($dir, FILE_CREATE_DIRECTORY);

    if ($is_writable) {
      // If required, validate the uploaded picture.
      $validators = array(
        'file_validate_is_image' => array(),
        'file_validate_image_resolution' => array(variable_get('user_picture_dimensions', '85x85')),
        'file_validate_size' => array(variable_get('user_picture_file_size', 30) * 1024),
      );

      if ($file = file_save_upload('picture_upload', $validators, $dir, FILE_EXISTS_RENAME)) {

        if (image_get_info($file->uri)) {
          $info = image_get_info($file->uri);
          global $user;
          $file->status = FILE_STATUS_PERMANENT;
          $file->filename = 'avatar' . '-' . $user->uid . '-' . REQUEST_TIME . '.' . $info['extension'];
          $file = file_save($file);
          _avatar_selection_save_avatar_info(0, $file->filename, $name, $access, /*$og, */$weight);
          drupal_set_message(t('New image saved.'));
        }
        else {
          file_delete($file->uri);
          drupal_set_message(t('Uploaded file does not appear to be a valid image file. Please try again.'));
        }
      }
    }
    else {
      form_set_error('picture_upload', t('Directory not writable: !dir', array('!dir' => $dir)));
    }
  }
}