<?php
/**
 * ---------------------------------------------------------------------
 * GLPI - Gestionnaire Libre de Parc Informatique
 * Copyright (C) 2015-2021 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/>.
 * ---------------------------------------------------------------------
 */

abstract class AbstractRightsDropdown
{
   /**
    * Max limit per itemtype
    */
   const LIMIT = 50;

   /**
    * To be redefined by subclasses, specify enabled types
    *
    * @return array
    */
   protected static function getTypes(): array {
      return [];
   }

   /**
    * Check if a given type is enabled
    *
    * @param string $type Class to check
    *
    * @return bool
    */
   protected static function isTypeEnabled(string $type): bool {
      $types = array_flip(static::getTypes());
      return isset($types[$type]);
   }

   /**
    * Get possible data for profiles
    *
    * @param string $name  Field name
    * @param array $values Selected values
    *
    * @return array
    */
   public static function show(string $name, array $values): string {
      global $CFG_GLPI;

      // Build DOM id
      $field_id = $name . "_" . mt_rand();

      // Build url
      $url = $CFG_GLPI['root_doc'] . "/ajax/getRightDropdownValue.php";

      // Build params
      $params = [
         'values' => $values,
         'valuesnames' => self::getValueNames($values),
      ];

      return Html::jsAjaxDropdown($name, $field_id, $url, $params);
   }

   /**
    * Get possible data for profiles
    *
    * @param string $text Search string
    *
    * @return array
    */
   public static function fetchValues(string $text = ""): array {
      $possible_rights = [];

      // Add profiles if enabled
      if (self::isTypeEnabled(Profile::getType())) {
         $possible_rights[Profile::getType()] = self::getProfiles($text);
      }

      // Add entities if enabled
      if (self::isTypeEnabled(Entity::getType())) {
         $possible_rights[Entity::getType()] = self::getEntities($text);
      }

      // Add users if enabled
      if (self::isTypeEnabled(User::getType())) {
         $possible_rights[User::getType()] = self::getUsers($text);
      }

      // Add groups if enabled
      if (self::isTypeEnabled(Group::getType())) {
         $possible_rights[Group::getType()] = self::getGroups($text);
      }

      $results = [];
      foreach ($possible_rights as $itemtype => $ids) {
         $new_group = [];
         foreach ($ids as $id => $label) {
            $new_group[] = [
               'id' => $id,
               'text' => $label,
               "selection_text"=> "$itemtype - $label",
            ];
         }
         $results[] = [
            "text" => $itemtype::getTypeName(1),
            "children" => $new_group,
         ];
      }

      $ret = [
         'results' => Toolbox::unclean_cross_side_scripting_deep($results),
         'count' =>  count($results)
      ];

      return $ret;
   }

   /**
    * Get names for each selected values
    *
    * @param array $values Selected values
    *
    * @return array
    */
   protected static function getValueNames(array $values): array {
      return array_map(function($value) {
         $data = explode("-", $value);
         $itemtype = getItemtypeForForeignKeyField($data[0]);
         $items_id = $data[1];
         $item = new $itemtype;

         return $itemtype::getTypeName(1) . " - " . Dropdown::getDropdownName(
            $item->getTable(),
            $items_id
         );
      }, $values);
   }

   /**
    * Get possible values for profiles
    *
    * @param string $text Search string
    *
    * @return array
    */
   protected static function getProfiles(string $text): array {
      $profile_item = new Profile();
      $profiles = $profile_item->find([
         'name' => ["LIKE", "%$text%"]
      ], [], self::LIMIT);
      $profiles_items = [];
      foreach ($profiles as $profile) {
         $new_key = 'profiles_id-'.$profile['id'];
         $profiles_items[$new_key] = $profile['name'];
      }

      return $profiles_items;
   }

   /**
    * Get possible values for entities
    *
    * @param string $text Search string
    *
    * @return array
    */
   protected static function getEntities(string $text): array {
      $entity_item = new Entity;
      $entities = $entity_item->find(
         [
            'name' => ["LIKE", "%$text%"]
         ] + getEntitiesRestrictCriteria(Entity::getTable()),
         [],
         self::LIMIT
      );
      $entities_items = [];
      foreach ($entities as $entity) {
         $new_key = 'entities_id-'.$entity['id'];
         $entities_items[$new_key] = $entity['completename'];
      }

      return $entities_items;
   }

   /**
    * Get possible values for users
    *
    * @param string $text Search string
    *
    * @return array
    */
   protected static function getUsers(string $text): array {
      $users = User::getSqlSearchResult(false, "all", -1, 0, [], $text, 0, self::LIMIT);
      $users_items = [];
      foreach ($users as $user) {
         $new_key = 'users_id-'.$user['id'];
         $users_items[$new_key] = $user['name'];
      }

      return $users_items;
   }

   /**
    * Get possible values for groups
    *
    * @param string $text Search string
    *
    * @return array
    */
   protected static function getGroups(string $text): array {
      $group_item = new Group;
      $groups = $group_item->find(
         [
            'name' => ["LIKE", "%$text%"]
         ] + getEntitiesRestrictCriteria(Group::getTable()),
         [],
         self::LIMIT
      );
      $groups_items = [];
      foreach ($groups as $group) {
         $new_key = 'groups_id-'.$group['id'];
         $groups_items[$new_key] = $group['name'];
      }

      return $groups_items;
   }
}
