<?php
/**
 * ---------------------------------------------------------------------
 * GLPI - Gestionnaire Libre de Parc Informatique
 * Copyright (C) 2015-2018 Teclib' and contributors.
 *
 * http://glpi-project.org
 *
 * based on GLPI - Gestionnaire Libre de Parc Informatique
 * Copyright (C) 2003-2014 by the INDEPNET Development Team.
 *
 * ---------------------------------------------------------------------
 *
 * LICENSE
 *
 * This file is part of GLPI.
 *
 * GLPI is free software; you can redistribute it 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.
 *
 * GLPI 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 more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GLPI. If not, see <http://www.gnu.org/licenses/>.
 * ---------------------------------------------------------------------
 */

if (!defined('GLPI_ROOT')) {
   die("Sorry. You can't access this file directly");
}


/**
 * Only an HTMLTableMain can create an HTMLTableSuperHeader.
 * @since 0.84
**/
class HTMLTableSuperHeader extends HTMLTableHeader {

   /// The headers of each column
   private $headerSets = [];
   /// The table that owns the current super header
   private $table;


   /**
    * @param $table              HTMLTableMain object: table owning the current header
    * @param $name      string   the name of the header
    * @param $content            see inc/HTMLTableEntity#__construct()
    * @param $father             HTMLTableSuperHeader objet (default NULL)
   **/
   function __construct(HTMLTableMain $table, $name, $content, HTMLTableSuperHeader $father = null) {

      $this->table = $table;
      parent::__construct($name, $content, $father);
   }


   /**
    * Compute the Least Common Multiple of two integers
    *
    * @param $first
    * @param $second
    *
    * @return integer LCM of $first and $second
   **/
   private static function LCM($first, $second) {

      $result = $first * $second;
      while ($first > 1) {
         $reste = $first % $second;
         if ($reste == 0) {
            $result = $result / $second;
            break;  // leave when LCM is found
         }
         $first = $second;
         $second = $reste;
      }
      return $result;
   }


   function isSuperHeader() {
      return true;
   }


   /**
    * @see HTMLTableHeader::getHeaderAndSubHeaderName()
   **/
   function getHeaderAndSubHeaderName(&$header_name, &$subheader_name) {

      $header_name    = $this->getName();
      $subheader_name = '';
   }


   function getCompositeName() {
      return $this->getName().':';
   }


   protected function getTable() {
      return $this->table;
   }


   /**
    * compute the total number of current super header colspan: it is the Least Common
    * Multiple of the colspan of each subHeader it owns.
    *
    * @param $number the colspan for this header given by the group
   **/
   function updateNumberOfSubHeader($number) {
      $this->setColSpan(self::LCM($number, $this->getColSpan()));
   }


   /**
    * The super headers always have to be displayed, conversely to sub headers
    *
    * @return always true
   **/
   function hasToDisplay() {
      return true;
   }

}
