<?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");
}

/**
 * Reservation Class
**/
class Reservation extends CommonDBChild {

   // From CommonDBChild
   static public $itemtype          = 'ReservationItem';
   static public $items_id          = 'reservationitems_id';

   static $rightname                = 'reservation';
   static public $checkParentRights = self::HAVE_VIEW_RIGHT_ON_ITEM;


   /**
    * @param $nb  integer  for singular or plural
   **/
   static function getTypeName($nb = 0) {
      return _n('Reservation', 'Reservations', $nb);
   }


   /**
    * @see CommonGLPI::getTabNameForItem()
   **/
   function getTabNameForItem(CommonGLPI $item, $withtemplate = 0) {

      if (!$withtemplate
          && Session::haveRight("reservation", READ)) {
         return self::getTypeName(Session::getPluralNumber());
      }
      return '';
   }


   /**
    * @param $item         CommonGLPI object
    * @param $tabnum       (default1)
    * @param $withtemplate (default0)
   **/
   static function displayTabContentForItem(CommonGLPI $item, $tabnum = 1, $withtemplate = 0) {

      if ($item->getType() == 'User') {
         self::showForUser($_GET["id"]);
      } else {
         self::showForItem($item);
      }
      return true;
   }


   function pre_deleteItem() {
      global $CFG_GLPI;

      if (isset($this->fields["users_id"])
          && (($this->fields["users_id"] === Session::getLoginUserID())
              || Session::haveRight("reservation", DELETE))) {

         // Processing Email
         if (!isset($this->input['_disablenotif']) && $CFG_GLPI["use_notifications"]) {
            NotificationEvent::raiseEvent("delete", $this);
         }
      }
      return true;
   }


   /**
    * @see CommonDBChild::prepareInputForUpdate()
   **/
   function prepareInputForUpdate($input) {

      $item = 0;
      if (isset($input['_item'])) {
         $item = $_POST['_item'];
      }

      // Save fields
      $oldfields             = $this->fields;
      // Needed for test already planned
      if (isset($input["begin"])) {
         $this->fields["begin"] = $input["begin"];
      }
      if (isset ($input["end"])) {
         $this->fields["end"] = $input["end"];
      }

      if (!$this->test_valid_date()) {
         $this->displayError("date", $item);
         return false;
      }

      if ($this->is_reserved()) {
         $this->displayError("is_res", $item);
         return false;
      }

      // Restore fields
      $this->fields = $oldfields;

      return parent::prepareInputForUpdate($input);
   }


   /**
    * @see CommonDBTM::post_updateItem()
   **/
   function post_updateItem($history = 1) {
      global $CFG_GLPI;

      if (count($this->updates)
          && $CFG_GLPI["use_notifications"]
          && !isset($this->input['_disablenotif'])) {
         NotificationEvent::raiseEvent("update", $this);
         //$mail = new MailingResa($this,"update");
         //$mail->send();
      }

      parent::post_updateItem($history);
   }


   /**
    * @see CommonDBChild::prepareInputForAdd()
   **/
   function prepareInputForAdd($input) {

      // Error on previous added reservation on several add
      if (isset($input['_ok']) && !$input['_ok']) {
         return false;
      }

      // set new date.
      $this->fields["reservationitems_id"] = $input["reservationitems_id"];
      $this->fields["begin"]               = $input["begin"];
      $this->fields["end"]                 = $input["end"];

      if (!$this->test_valid_date()) {
         $this->displayError("date", $input["reservationitems_id"]);
         return false;
      }

      if ($this->is_reserved()) {
         $this->displayError("is_res", $input["reservationitems_id"]);
         return false;
      }

      return parent::prepareInputForAdd($input);
   }


   function post_addItem() {
      global $CFG_GLPI;

      if (!isset($this->input['_disablenotif']) && $CFG_GLPI["use_notifications"]) {
         NotificationEvent::raiseEvent("new", $this);
      }

      parent::post_addItem();
   }


   // SPECIFIC FUNCTIONS

   /**
    * @param $reservationitems_id
   **/
   function getUniqueGroupFor($reservationitems_id) {
      global $DB;

      do {
         $rand = mt_rand(1, mt_getrandmax());

         $query = "SELECT COUNT(*) AS CPT
                   FROM `glpi_reservations`
                   WHERE `reservationitems_id` = '$reservationitems_id'
                         AND `group` = '$rand';";
         $result = $DB->query($query);
         $count  = $DB->result($result, 0, 0);
      } while ($count > 0);

      return $rand;
   }


   /**
    * Is the item already reserved ?
    *
    *@return boolean
   **/
   function is_reserved() {
      global $DB;

      if (!isset($this->fields["reservationitems_id"])
          || empty($this->fields["reservationitems_id"])) {
         return true;
      }

      // When modify a reservation do not itself take into account
      $ID_where = "";
      if (isset($this->fields["id"])) {
         $ID_where = " `id` <> '".$this->fields["id"]."' AND ";
      }
      $query = "SELECT *
                FROM `".$this->getTable()."`
                WHERE $ID_where
                      `reservationitems_id` = '".$this->fields["reservationitems_id"]."'
                      AND '".$this->fields["begin"]."' < `end`
                      AND '".$this->fields["end"]."' > `begin`";
      if ($result = $DB->query($query)) {
         return ($DB->numrows($result) > 0);
      }
      return true;
   }


   /**
    * Current dates are valid ? begin before end
    *
    *@return boolean
   **/
   function test_valid_date() {

      return (!empty($this->fields["begin"])
              && !empty($this->fields["end"])
              && (strtotime($this->fields["begin"]) < strtotime($this->fields["end"])));
   }


   /**
    * display error message
    *
    * @param $type   error type : date / is_res / other
    * @param $ID     ID of the item
    *
    * @return nothing
   **/
   function displayError($type, $ID) {

      echo "<br><div class='center'>";
      switch ($type) {
         case "date" :
            echo __('Error in entering dates. The starting date is later than the ending date');
            break;

         case "is_res" :
            echo __('The required item is already reserved for this timeframe');
            break;

         default :
            echo __("Unknown error");
      }

      echo "<br><a href='reservation.php?reservationitems_id=$ID'>".__('Back to planning')."</a>";
      echo "</div>";
   }


   /**
    * @since 0.84
   **/
   static function canCreate() {
      return (Session::haveRight(self::$rightname, ReservationItem::RESERVEANITEM));
   }


   /**
    * @since 0.84
   **/
   static function canUpdate() {
      return (Session::haveRight(self::$rightname, ReservationItem::RESERVEANITEM));
   }


   /**
    * @since 0.84
   **/
   static function canDelete() {
      return (Session::haveRight(self::$rightname, ReservationItem::RESERVEANITEM));
   }


   /**
    * Overload canChildItem to make specific checks
    * @since 0.84
   **/
   function canChildItem($methodItem, $methodNotItem) {

      // Original user always have right
      if ($this->fields['users_id'] === Session::getLoginUserID()) {
         return true;
      }

      if (!parent::canChildItem($methodItem, $methodNotItem)) {
         return false;
      }

      $ri = $this->getItem();
      if ($ri === false) {
         return false;
      }

      $item = $ri->getItem();
      if ($item === false) {
         return false;
      }

      return Session::haveAccessToEntity($item->getEntityID());
   }


   function post_purgeItem() {
      global $DB;

      if (isset($this->input['_delete_group']) && $this->input['_delete_group']) {
         $query = "SELECT *
                   FROM `glpi_reservations`
                   WHERE `reservationitems_id` = '".$this->fields['reservationitems_id']."'
                         AND `group` = '".$this->fields['group']."' ";
         $rr = clone $this;
         foreach ($DB->request($query) as $data) {
            $rr->delete(['id' => $data['id']]);
         }
      }
   }


   /**
    * Show reservation calendar
    *
    * @param $ID   ID of the reservation item (if empty display all) (default '')
   **/
   static function showCalendar($ID = "") {
      global $CFG_GLPI;

      if (!Session::haveRight("reservation", ReservationItem::RESERVEANITEM)) {
         return false;
      }

      if (!isset($_GET["mois_courant"])) {
         $mois_courant = intval(strftime("%m"));
      } else {
         $mois_courant = $_GET["mois_courant"];
      }

      if (!isset($_GET["annee_courante"])) {
         $annee_courante = strftime("%Y");
      } else {
         $annee_courante = $_GET["annee_courante"];
      }

      $mois_courant     = intval($mois_courant);
      $mois_suivant     = $mois_courant+1;
      $mois_precedent   = $mois_courant-1;
      $annee_suivante   = $annee_courante;
      $annee_precedente = $annee_courante;

      if ($mois_precedent == 0) {
         $mois_precedent   = 12;
         $annee_precedente --;
      }

      if ($mois_suivant == 13) {
         $mois_suivant   = 1;
         $annee_suivante ++;
      }

      $monthsarray   = Toolbox::getMonthsOfYearArray();

      $str_suivant   = "?reservationitems_id=$ID&amp;mois_courant=$mois_suivant&amp;".
                        "annee_courante=$annee_suivante";
      $str_precedent = "?reservationitems_id=$ID&amp;mois_courant=$mois_precedent&amp;".
                        "annee_courante=$annee_precedente";

      if (!empty($ID)) {
         $m = new ReservationItem();
         $m->getFromDB($ID);

         if ((!isset($m->fields['is_active'])) || !$m->fields['is_active']) {
            echo "<div class='center'>";
            echo "<table class='tab_cadre_fixe'>";
            echo "<tr class='tab_bg_2'>";
            echo "<td class='center b'>".__('Device temporarily unavailable')."</td></tr>";
            echo "<tr class='tab_bg_1'><td class='center b'>";
            Html::displayBackLink();
            echo "</td></tr>";
            echo "</table>";
            echo "</div>";
            return false;
         }
         $type = $m->fields["itemtype"];
         $name = NOT_AVAILABLE;
         if ($item = getItemForItemtype($m->fields["itemtype"])) {
            $type = $item->getTypeName();

            if ($item->getFromDB($m->fields["items_id"])) {
               $name = $item->getName();
            }
            $name = sprintf(__('%1$s - %2$s'), $type, $name);
         }

         $all = "<a class='vsubmit' href='reservation.php?reservationitems_id=&amp;mois_courant=".
                  "$mois_courant&amp;annee_courante=$annee_courante'>".__('Show all')."</a>";

      } else {
         $type = "";
         $name = __('All reservable devices');
         $all  = "&nbsp;";
      }

      echo "<div class='center'><table class='tab_glpi'><tr><td>";
      echo "<img src='".$CFG_GLPI["root_doc"]."/pics/reservation.png' alt=''></td>";
      echo "<td class ='b'>".$name."</td></tr>";
      echo "<tr><td colspan='2' class ='center'>$all</td></tr></table></div><br>\n";

      // Check bisextile years
      if (($annee_courante%4) == 0) {
         $fev = 29;
      } else {
         $fev = 28;
      }
      $nb_jour = [31, $fev, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

      // Datas used to put right information in columns
      $jour_debut_mois = strftime("%w", mktime(0, 0, 0, $mois_courant, 1, $annee_courante));
      if ($jour_debut_mois == 0) {
         $jour_debut_mois = 7;
      }
      $jour_fin_mois = strftime("%w", mktime(0, 0, 0, $mois_courant, $nb_jour[$mois_courant-1],
                                             $annee_courante));

      echo "<div class='center'>";
      echo "<table class='tab_glpi'><tr><td><a href='reservation.php".$str_precedent."'>";
      echo "<img src='".$CFG_GLPI["root_doc"]."/pics/left.png' alt=\"".__s('Previous').
             "\" title=\"".__s('Previous')."\"></a></td>";
      echo "<td class='b'>".sprintf(__('%1$s %2$s'), $monthsarray[$mois_courant], $annee_courante).
           "</td>";
      echo "<td><a href='reservation.php".$str_suivant."'>";
      echo "<img src='".$CFG_GLPI["root_doc"]."/pics/right.png' alt=\"".__s('Next').
             "\" title=\"".__s('Next')."\"></a></td></tr></table>\n";

      // test
      echo "<table width='90%' class='tab_glpi'><tr><td class='top' width='100px'>";

      echo "<table><tr><td width='100px' class='top'>";

      // today date
      $today = getdate(time());
      $mois  = $today["mon"];
      $annee = $today["year"];

      $annee_avant = $annee_courante - 1;
      $annee_apres = $annee_courante + 1;

      echo "<div class='calendrier_mois'>";
      echo "<div class='center b'>$annee_avant</div>";

      for ($i=$mois_courant; $i<13; $i++) {
         echo "<div class='calendrier_case2'>";
         echo "<a href='reservation.php?reservationitems_id=$ID&amp;mois_courant=$i&amp;".
               "annee_courante=$annee_avant'>".$monthsarray[$i]."</a></div>";
      }

      echo "<div class='center b'>$annee_courante</div>";

      for ($i=1; $i<13; $i++) {
         if ($i == $mois_courant) {
            echo "<div class='calendrier_case1 b'>".$monthsarray[$i]."</div>\n";
         } else {
            echo "<div class='calendrier_case2'>";
            echo "<a href='reservation.php?reservationitems_id=$ID&amp;mois_courant=$i&amp;".
                  "annee_courante=$annee_courante'>".$monthsarray[$i]."</a></div>\n";
         }
      }
      echo "<div class='center b'>$annee_apres</div>\n";

      for ($i=1; $i<$mois_courant+1; $i++) {
         echo "<div class='calendrier_case2'>";
         echo "<a href='reservation.php?reservationitems_id=$ID&amp;mois_courant=$i&amp;".
               "annee_courante=$annee_apres'>".$monthsarray[$i]."</a></div>\n";
      }
      echo "</div>";
      echo "</td></tr></table>";
      echo "</td><td class='top' width='100%'>";

      // test
      echo "<table width='100%' class='tab_cadre'><tr>";
      echo "<th width='14%'>".__('Monday')."</th>";
      echo "<th width='14%'>".__('Tuesday')."</th>";
      echo "<th width='14%'>".__('Wednesday')."</th>";
      echo "<th width='14%'>".__('Thursday')."</th>";
      echo "<th width='14%'>".__('Friday')."</th>";
      echo "<th width='14%'>".__('Saturday')."</th>";
      echo "<th width='14%'>".__('Sunday')."</th>";
      echo "</tr>\n";
      echo "<tr class='tab_bg_3' >";

      // Insert blank cell before the first day of the month
      for ($i=1; $i<$jour_debut_mois; $i++) {
         echo "<td class='calendrier_case_white'>&nbsp;</td>";
      }

      // voici le remplissage proprement dit
      if (($mois_courant < 10) && (strlen($mois_courant) == 1)) {
         $mois_courant = "0".$mois_courant;
      }

      for ($i=1; $i<$nb_jour[$mois_courant-1]+1; $i++) {
         if ($i < 10) {
            $ii = "0".$i;
         } else {
            $ii = $i;
         }

         echo "<td class='top' height='100px'>";
         echo "<table class='center' width='100%'><tr><td class='center'>";
         echo "<span class='calendrier_jour'>".$i."</span></td></tr>\n";

         if (!empty($ID)) {
            echo "<tr><td class='center'>";
            echo "<a href='".Reservation::getFormURL()."?id=&amp;item[$ID]=$ID&amp;".
                  "begin=".$annee_courante."-".$mois_courant."-".$ii." 12:00:00'>";
            echo "<img  src='".$CFG_GLPI["root_doc"]."/pics/addresa.png' alt=\"".
                  __s('Reserve')."\" title=\"".__s('Reserve')."\"></a></td></tr>\n";
         }

         echo "<tr><td>";
         self::displayReservationDay($ID, $annee_courante."-".$mois_courant."-".$ii);
         echo "</td></tr></table>\n";
         echo "</td>";

         // il ne faut pas oublie d'aller a la ligne suivante en fin de semaine
         if ((($i+$jour_debut_mois)%7) == 1) {
            echo "</tr>\n";
            if ($i != $nb_jour[$mois_courant-1]) {
               echo "<tr class='tab_bg_3'>";
            }
         }
      }

      // on recommence pour finir le tableau proprement pour les m???es raisons
      if ($jour_fin_mois != 0) {
         for ($i=0; $i<7-$jour_fin_mois; $i++) {
            echo "<td class='calendrier_case_white'>&nbsp;</td>";
         }
      }

      echo "</tr></table>\n";
      echo "</td></tr></table></div>\n";
   }


   /**
    * Display for reservation
    *
    * @param $ID              ID of the reservation (empty for create new)
    * @param $options   array of possibles options:
    *     - item  reservation items ID for creation process
    *     - date date for creation process
   **/
   function showForm($ID, $options = []) {
      global $CFG_GLPI;

      if (!Session::haveRight("reservation", ReservationItem::RESERVEANITEM)) {
         return false;
      }

      $resa = new self();

      if (!empty($ID)) {
         if (!$resa->getFromDB($ID)) {
            return false;
         }

         if (!$resa->can($ID, UPDATE)) {
            return false;
         }
         // Set item if not set
         if ((!isset($options['item']) || (count($options['item']) == 0))
             && ($itemid = $resa->getField('reservationitems_id'))) {
            $options['item'][$itemid] = $itemid;
         }

      } else {
         $resa->getEmpty();
         $resa->fields["begin"] = $options['begin'];
         if (!isset($options['end'])) {
            $resa->fields["end"] = date("Y-m-d H:00:00",
                                        strtotime($resa->fields["begin"])+HOUR_TIMESTAMP);
         } else {
            $resa->fields["end"] = $options['end'];
         }
      }

      // No item : problem
      if (!isset($options['item']) || (count($options['item']) == 0)) {
         return false;
      }

      echo "<div class='center'><form method='post' name=form action='".Reservation::getFormURL()."'>";

      if (!empty($ID)) {
         echo "<input type='hidden' name='id' value='$ID'>";
      }

      echo "<table class='tab_cadre' width='700px'>";
      echo "<tr><th colspan='2'>".__('Reserve an item')."</th></tr>\n";

      // Add Hardware name
      $r = new ReservationItem();

      echo "<tr class='tab_bg_1'><td>".__('Item')."</td>";
      echo "<td>";
      foreach ($options['item'] as $itemID) {
         $r->getFromDB($itemID);
         $type = $r->fields["itemtype"];
         $name = NOT_AVAILABLE;
         $item = null;

         if ($item = getItemForItemtype($r->fields["itemtype"])) {
            $type = $item->getTypeName();

            if ($item->getFromDB($r->fields["items_id"])) {
               $name = $item->getName();
            } else {
               $item = null;
            }
         }

         echo "<span class='b'>".sprintf(__('%1$s - %2$s'), $type, $name)."</span><br>";
         echo "<input type='hidden' name='items[$itemID]' value='$itemID'>";
      }

      echo "</td></tr>\n";

      $uid = (empty($ID) ? Session::getLoginUserID() : $resa->fields['users_id']);
      echo "<tr class='tab_bg_2'><td>".__('By')."</td>";
      echo "<td>";
      if (!Session::haveRight("reservation", UPDATE)
          || is_null($item)
          || !Session::haveAccessToEntity($item->fields["entities_id"])) {

         echo "<input type='hidden' name='users_id' value='".$uid."'>";
         echo Dropdown::getDropdownName(
            User::getTable(),
            $uid
         );
      } else {
         User::dropdown([
            'value'        => $uid,
            'entity'       => $item->getEntityID(),
            'entity_sons'  => $item->isRecursive(),
            'right'        => 'all'
         ]);
      }
      echo "</td></tr>\n";
      echo "<tr class='tab_bg_2'><td>".__('Start date')."</td><td>";
      $rand_begin = Html::showDateTimeField("resa[begin]",
                                            ['value'      => $resa->fields["begin"],
                                                  'timestep'   => -1,
                                                  'maybeempty' => false]);
      echo "</td></tr>\n";
      $default_delay = floor((strtotime($resa->fields["end"])-strtotime($resa->fields["begin"]))
                             /$CFG_GLPI['time_step']/MINUTE_TIMESTAMP)
                       *$CFG_GLPI['time_step']*MINUTE_TIMESTAMP;
      echo "<tr class='tab_bg_2'><td>".__('Duration')."</td><td>";
      $rand = Dropdown::showTimeStamp("resa[_duration]",
                                      ['min'        => 0,
                                            'max'        => 24*HOUR_TIMESTAMP,
                                            'value'      => $default_delay,
                                            'emptylabel' => __('Specify an end date')]);
      echo "<br><div id='date_end$rand'></div>";
      $params = ['duration'     => '__VALUE__',
                      'end'          => $resa->fields["end"],
                      'name'         => "resa[end]"];

      Ajax::updateItemOnSelectEvent("dropdown_resa[_duration]$rand", "date_end$rand",
                                    $CFG_GLPI["root_doc"]."/ajax/planningend.php", $params);

      if ($default_delay == 0) {
         $params['duration'] = 0;
         Ajax::updateItem("date_end$rand", $CFG_GLPI["root_doc"]."/ajax/planningend.php", $params);
      }
      Alert::displayLastAlert('Reservation', $ID);
      echo "</td></tr>\n";

      if (empty($ID)) {
         echo "<tr class='tab_bg_2'><td>".__('Repetition')."</td>";
         echo "<td>";
         $values   = [''      => _x('periodicity', 'None'),
                           'day'   => _x('periodicity', 'Daily'),
                           'week'  => _x('periodicity', 'Weekly'),
                           'month' => _x('periodicity', 'Monthly')];
         $rand     = Dropdown::showFromArray('periodicity[type]', $values);
         $field_id = Html::cleanId("dropdown_periodicity[type]$rand");

         $params   = ['type'     => '__VALUE__',
                           'end'      => $resa->fields["end"]];

         Ajax::updateItemOnSelectEvent($field_id, "resaperiodcontent$rand",
                                       $CFG_GLPI["root_doc"]."/ajax/resaperiod.php", $params);
         echo "<br><div id='resaperiodcontent$rand'></div>";

         echo "</td></tr>\n";
      }

      echo "<tr class='tab_bg_2'><td>".__('Comments')."</td>";
      echo "<td><textarea name='comment' rows='8' cols='60'>".$resa->fields["comment"]."</textarea>";
      echo "</td></tr>\n";

      if (empty($ID)) {
         echo "<tr class='tab_bg_2'>";
         echo "<td colspan='2' class='top center'>";
         echo "<input type='submit' name='add' value=\""._sx('button', 'Add')."\" class='submit'>";
         echo "</td></tr>\n";

      } else {
         if (($resa->fields["users_id"] == Session::getLoginUserID())
             || Session::haveRightsOr(static::$rightname, [PURGE, UPDATE])) {
            echo "<tr class='tab_bg_2'>";
            if (($resa->fields["users_id"] == Session::getLoginUserID())
                || Session::haveRight(static::$rightname, PURGE)) {
               echo "<td class='top center'>";
               echo "<input type='submit' name='purge' value=\""._sx('button', 'Delete permanently')."\"
                      class='submit'>";
               if ($resa->fields["group"] > 0) {
                  echo "<br><input type='checkbox' name='_delete_group'>&nbsp;".
                             __s('Delete all repetition');
               }
               echo "</td>";
            }
            if (($resa->fields["users_id"] == Session::getLoginUserID())
                || Session::haveRight(static::$rightname, UPDATE)) {
               echo "<td class='top center'>";
               echo "<input type='submit' name='update' value=\""._sx('button', 'Save')."\"
                     class='submit'>";
               echo "</td>";
            }
            echo "</tr>\n";
         }
      }
      echo "</table>";
      Html::closeForm();
      echo "</div>\n";
   }


   /**
    * compute periodicities for reservation
    *
    * @since 0.84
    *
    * @param $begin             begin of the initial reservation
    * @param $end               begin of the initial reservation
    * @param $options   array   periodicity parameters : must contain : type (day/week/month), end
   **/
   static function computePeriodicities ($begin, $end, $options = []) {
      $toadd = [];

      if (isset($options['type']) && isset($options['end'])) {
         $begin_time = strtotime($begin);
         $end_time   = strtotime($end);
         $repeat_end = strtotime($options['end'].' 23:59:59');

         switch ($options['type']) {
            case 'day' :
               $begin_time = strtotime("+1 day", $begin_time);
               $end_time   = strtotime("+1 day", $end_time);
               while ($begin_time < $repeat_end) {
                  $toadd[date('Y-m-d H:i:s', $begin_time)] = date('Y-m-d H:i:s', $end_time);
                  $begin_time = strtotime("+1 day", $begin_time);
                  $end_time   = strtotime("+1 day", $end_time);
               }
               break;

            case 'week' :
               $dates = [];

               // No days set add 1 week
               if (!isset($options['days'])) {
                  $dates = [['begin' => strtotime('+1 week', $begin_time),
                                       'end'   => strtotime('+1 week', $end_time)]];
               } else {
                  if (is_array($options['days'])) {
                     $begin_hour = $begin_time- strtotime(date('Y-m-d', $begin_time));
                     $end_hour   = $end_time - strtotime(date('Y-m-d', $end_time));
                     foreach ($options['days'] as $day => $val) {
                        $dates[] = ['begin' => strtotime("next $day", $begin_time)+$begin_hour,
                                         'end'   => strtotime("next $day", $end_time)+$end_hour];
                     }
                  }
               }

               foreach ($dates as $key => $val) {
                  $begin_time = $val['begin'];
                  $end_time   = $val['end'];

                  while ($begin_time < $repeat_end) {
                     $toadd[date('Y-m-d H:i:s', $begin_time)] = date('Y-m-d H:i:s', $end_time);
                     $begin_time = strtotime('+1 week', $begin_time);
                     $end_time   = strtotime('+1 week', $end_time);
                  }
               }
               break;

            case 'month' :
               if (isset($options['subtype'])) {
                  switch ($options['subtype']) {
                     case 'date':
                        $i=1;
                        $calc_begin_time = strtotime("+$i month", $begin_time);
                        $calc_end_time   = strtotime("+$i month", $end_time);
                        while ($calc_begin_time < $repeat_end) {
                           $toadd[date('Y-m-d H:i:s', $calc_begin_time)] = date('Y-m-d H:i:s',
                                                                                $calc_end_time);
                           $i++;
                           $calc_begin_time = strtotime("+$i month", $begin_time);
                           $calc_end_time   = strtotime("+$i month", $end_time);
                        }
                        break;

                     case 'day':
                        $dayofweek = date('l', $begin_time);

                        $i               = 1;
                        $calc_begin_time = strtotime("+$i month", $begin_time);
                        $calc_end_time   = strtotime("+$i month", $end_time);
                        $begin_hour      = $begin_time- strtotime(date('Y-m-d', $begin_time));
                        $end_hour        = $end_time - strtotime(date('Y-m-d', $end_time));

                        $calc_begin_time = strtotime("next $dayofweek", $calc_begin_time)
                                           + $begin_hour;
                        $calc_end_time   = strtotime("next $dayofweek", $calc_end_time) + $end_hour;

                        while ($calc_begin_time < $repeat_end) {
                           $toadd[date('Y-m-d H:i:s', $calc_begin_time)] = date('Y-m-d H:i:s',
                                                                                $calc_end_time);
                           $i++;
                           $calc_begin_time = strtotime("+$i month", $begin_time);
                           $calc_end_time   = strtotime("+$i month", $end_time);
                           $calc_begin_time = strtotime("next $dayofweek", $calc_begin_time)
                                              + $begin_hour;
                           $calc_end_time   = strtotime("next $dayofweek", $calc_end_time)
                                              + $end_hour;
                        }
                        break;
                  }

               }

               break;
         }

      }

      return $toadd;
   }


   /**
    * Display for reservation
    *
    * @param $ID     ID a the reservation item (empty to show all)
    * @param $date   date to display
   **/
   static function displayReservationDay($ID, $date) {
      global $DB;

      if (!empty($ID)) {
         self::displayReservationsForAnItem($ID, $date);

      } else {
         $debut = $date." 00:00:00";
         $fin   = $date." 23:59:59";

         $query = "SELECT DISTINCT `glpi_reservationitems`.`id`
                   FROM `glpi_reservationitems`
                   INNER JOIN `glpi_reservations`
                     ON (`glpi_reservationitems`.`id` = `glpi_reservations`.`reservationitems_id`)
                   WHERE `is_active` = 1
                         AND '".$debut."' < `end`
                         AND '".$fin."' > `begin`
                   ORDER BY `begin`";
         $result = $DB->query($query);

         if ($DB->numrows($result) > 0) {
            $m = new ReservationItem();
            while ($data = $DB->fetch_assoc($result)) {
               $m->getFromDB($data['id']);

               if (!($item = getItemForItemtype($m->fields["itemtype"]))) {
                  continue;
               }

               if ($item->getFromDB($m->fields["items_id"])
                   && Session::haveAccessToEntity($item->fields["entities_id"])) {

                  $typename = $item->getTypeName();

                  if ($m->fields["itemtype"] == 'Peripheral') {
                     if (isset($item->fields["peripheraltypes_id"])
                         && ($item->fields["peripheraltypes_id"] != 0)) {

                        $typename = Dropdown::getDropdownName("glpi_peripheraltypes",
                                                              $item->fields["peripheraltypes_id"]);
                     }
                  }

                  list($annee,$mois,$jour) = explode("-", $date);
                  echo "<tr class='tab_bg_1'><td>";
                  echo "<a href='reservation.php?reservationitems_id=".$data['id'].
                        "&amp;mois_courant=$mois&amp;annee_courante=$annee'>".
                        sprintf(__('%1$s - %2$s'), $typename, $item->getName())."</a></td></tr>\n";
                  echo "<tr><td>";
                  self::displayReservationsForAnItem($data['id'], $date);
                  echo "</td></tr>\n";
               }
            }
         }
      }
   }


   /**
    * Display a reservation
    *
    * @param $ID     ID a the reservation item
    * @param $date   date to display
   **/
   static function displayReservationsForAnItem($ID, $date) {
      global $DB;

      $users_id = Session::getLoginUserID();
      $resa     = new self();
      $user     = new User;
      list($year, $month, $day) = explode("-", $date);
      $debut    = $date." 00:00:00";
      $fin      = $date." 23:59:59";

      $query = "SELECT *
                FROM `glpi_reservations`
                WHERE '".$debut."' < `end`
                      AND '".$fin."' > `begin`
                      AND `reservationitems_id` = '$ID'
                ORDER BY `begin`";

      if ($result = $DB->query($query)) {
         if ($DB->numrows($result) > 0) {
            echo "<table width='100%'>";
            while ($row = $DB->fetch_assoc($result)) {
               echo "<tr>";
               $user->getFromDB($row["users_id"]);
               $display = "";

               if ($debut > $row['begin']) {
                  $heure_debut = "00:00";
               } else {
                  $heure_debut = get_hour_from_sql($row['begin']);
               }

               if ($fin < $row['end']) {
                  $heure_fin = "24:00";
               } else {
                  $heure_fin = get_hour_from_sql($row['end']);
               }

               if ((strcmp($heure_debut, "00:00") == 0)
                   && (strcmp($heure_fin, "24:00") == 0)) {
                  $display = __('Day');

               } else if (strcmp($heure_debut, "00:00") == 0) {
                  $display = sprintf(__('To %s'), $heure_fin);

               } else if (strcmp($heure_fin, "24:00") == 0) {
                  $display = sprintf(__('From %s'), $heure_debut);

               } else {
                  $display = $heure_debut."-".$heure_fin;
               }

               $rand  = mt_rand();
               $modif = $modif_end = "";
               if ($resa->canEdit($row['id'])) {
                  $modif      = "<a id='content_".$ID.$rand."'
                                  href='".Reservation::getFormURLWithID($row['id'])."'>";
                  $modif_end  = "</a>";
                  $modif_end .= Html::showToolTip($row["comment"],
                                                  ['applyto' => "content_".$ID.$rand,
                                                        'display' => false]);
               }

               echo "<td class='tab_resa center'>". $modif."<span>".$display."<br><span class='b'>".
               formatUserName($user->fields["id"], $user->fields["name"], $user->fields["realname"],
                              $user->fields["firstname"]);
               echo "</span></span>";
               echo $modif_end;
               echo "</td></tr>\n";
            }
            echo "</table>\n";
         }
      }
   }


   /**
    * Display reservations for an item
    *
    * @param $item            CommonDBTM object for which the reservation tab need to be displayed
    * @param $withtemplate    withtemplate param (default 0)
   **/
   static function showForItem(CommonDBTM $item, $withtemplate = 0) {
      global $DB, $CFG_GLPI;

      $resaID = 0;
      if (!Session::haveRight("reservation", READ)) {
         return false;
      }

      echo "<div class='firstbloc'>";
      ReservationItem::showActivationFormForItem($item);

      $ri = new ReservationItem();
      if ($ri->getFromDBbyItem($item->getType(), $item->getID())) {
         $now = $_SESSION["glpi_currenttime"];

         // Print reservation in progress
         $query = "SELECT *
                   FROM `glpi_reservations`
                   WHERE `end` > '".$now."'
                         AND `reservationitems_id` = '".$ri->fields['id']."'
                   ORDER BY `begin`";
         $result = $DB->query($query);

         echo "<table class='tab_cadre_fixehov'><tr><th colspan='5'>";

         if ($ri->fields["is_active"]) {
            echo "<a href='".$CFG_GLPI["root_doc"]."/front/reservation.php?reservationitems_id=".
                   $ri->fields['id']."'>".__('Current and future reservations')."</a>";
         } else {
            echo __('Current and future reservations');
         }
         echo "</th></tr>\n";

         if ($DB->numrows($result) == 0) {
            echo "<tr class='tab_bg_2'>";
            echo "<td class='center' colspan='5'>".__('No reservation')."</td></tr>\n";

         } else {
            echo "<tr><th>".__('Start date')."</th>";
            echo "<th>".__('End date')."</th>";
            echo "<th>".__('By')."</th>";
            echo "<th>".__('Comments')."</th><th>&nbsp;</th></tr>\n";

            while ($data  =$DB->fetch_assoc($result)) {
               echo "<tr class='tab_bg_2'>";
               echo "<td class='center'>".Html::convDateTime($data["begin"])."</td>";
               echo "<td class='center'>".Html::convDateTime($data["end"])."</td>";
               echo "<td class='center'>";
               echo "<a href='".User::getFormURLWithID($data["users_id"])."'>".getUserName($data["users_id"])."</a></td>";
               echo "<td class='center'>".nl2br($data["comment"])."</td>";
               echo "<td class='center'>";
               list($annee, $mois, $jour) = explode("-", $data["begin"]);
               echo "<a href='".$CFG_GLPI["root_doc"]."/front/reservation.php?reservationitems_id=".
                     $ri->fields['id']."&amp;mois_courant=$mois&amp;annee_courante=$annee' title=\"".
                     __s('See planning')."\">";
               echo "<img src=\"".$CFG_GLPI["root_doc"]."/pics/reservation-3.png\" alt=''>".
                    "</a>";
               echo "</td></tr>\n";
            }
         }
         echo "</table></div>\n";

         // Print old reservations
         $query = "SELECT *
                   FROM `glpi_reservations`
                   WHERE `end` <= '".$now."'
                         AND `reservationitems_id` = '".$ri->fields['id']."'
                   ORDER BY `begin` DESC";
         $result = $DB->query($query);

         echo "<div class='spaced'><table class='tab_cadre_fixehov'><tr><th colspan='5'>";

         if ($ri->fields["is_active"]) {
            echo "<a href='".$CFG_GLPI["root_doc"]."/front/reservation.php?reservationitems_id=".
                   $ri->fields['id']."' >".__('Past reservations')."</a>";
         } else {
            echo __('Past reservations');
         }
         echo "</th></tr>\n";

         if ($DB->numrows($result) == 0) {
            echo "<tr class='tab_bg_2'>";
            echo "<td class='center' colspan='5'>".__('No reservation')."</td></tr>\n";

         } else {
            echo "<tr><th>".__('Start date')."</th>";
            echo "<th>".__('End date')."</th>";
            echo "<th>".__('By')."</th>";
            echo "<th>".__('Comments')."</th><th>&nbsp;</th></tr>\n";

            while ($data = $DB->fetch_assoc($result)) {
               echo "<tr class='tab_bg_2'>";
               echo "<td class='center'>".Html::convDateTime($data["begin"])."</td>";
               echo "<td class='center'>".Html::convDateTime($data["end"])."</td>";
               echo "<td class='center'>";
               echo "<a href='".User::getFormURLWithID($data["users_id"])."'>".getUserName($data["users_id"])."</a></td>";
               echo "<td class='center'>".nl2br($data["comment"])."</td>";
               echo "<td class='center'>";
               list($annee, $mois ,$jour) = explode("-", $data["begin"]);
               echo "<a href='".$CFG_GLPI["root_doc"]."/front/reservation.php?reservationitems_id=".
                     $ri->fields['id']."&amp;mois_courant=$mois&amp;annee_courante=$annee' title=\"".
                     __s('See planning')."\">";
               echo "<img src=\"".$CFG_GLPI["root_doc"]."/pics/reservation-3.png\" alt=''>";
               echo "</a></td></tr>\n";
            }
         }
         echo "</table>\n";
      }
      echo "</div>\n";
   }


   /**
    * Display reservations for a user
    *
    * @param $ID ID a the user
   **/
   static function showForUser($ID) {
      global $DB, $CFG_GLPI;

      $resaID = 0;

      if (!Session::haveRight("reservation", READ)) {
         return false;
      }

      echo "<div class='firstbloc'>";
      $now = $_SESSION["glpi_currenttime"];

      // Print reservation in progress
      $query = "SELECT `begin`, `end`, `items_id`, `glpi_reservationitems`.`entities_id`,
                       `users_id`, `glpi_reservations`.`comment`, `reservationitems_id`,
                       `completename`
                FROM `glpi_reservations`
                LEFT JOIN `glpi_reservationitems`
                  ON `glpi_reservations`.`reservationitems_id` = `glpi_reservationitems`.`id`
                LEFT JOIN `glpi_entities`
                  ON  `glpi_reservationitems`.`entities_id` = `glpi_entities`.`id`
                WHERE `end` > '".$now."'
                      AND `users_id` = '$ID'
                ORDER BY `begin`";
      $result = $DB->query($query);

      $ri = new ReservationItem();
      echo "<table class='tab_cadre_fixehov'>";
      echo "<tr><th colspan='6'>".__('Current and future reservations')."</th></tr>\n";

      if ($DB->numrows($result) == 0) {
         echo "<tr class='tab_bg_2'>";
         echo "<td class='center' colspan='6'>".__('No reservation')."</td></tr\n>";

      } else {
         echo "<tr><th>".__('Start date')."</th>";
         echo "<th>".__('End date')."</th>";
         echo "<th>".__('Item')."</th>";
         echo "<th>".__('Entity')."</th>";
         echo "<th>".__('By')."</th>";
         echo "<th>".__('Comments')."</th><th>&nbsp;</th></tr>\n";

         while ($data = $DB->fetch_assoc($result)) {
            echo "<tr class='tab_bg_2'>";
            echo "<td class='center'>".Html::convDateTime($data["begin"])."</td>";
            echo "<td class='center'>".Html::convDateTime($data["end"])."</td>";

            if ($ri->getFromDB($data["reservationitems_id"])) {
               $link = "&nbsp;";

               if ($item = getItemForItemtype($ri->fields['itemtype'])) {
                  if ($item->getFromDB($ri->fields['items_id'])) {
                     $link = $item->getLink();
                  }
               }
               echo "<td class='center'>$link</td>";
               echo "<td class='center'>".$data['completename']."</td>";

            } else {
               echo "<td class='center'>&nbsp;</td>";
            }

            echo "<td class='center'>".getUserName($data["users_id"])."</td>";
            echo "<td class='center'>".nl2br($data["comment"])."</td>";
            echo "<td class='center'>";
            list($annee, $mois, $jour) = explode("-", $data["begin"]);
            echo "<a href='".$CFG_GLPI["root_doc"]."/front/reservation.php?reservationitems_id=".
                  $data["reservationitems_id"]."&amp;mois_courant=$mois&amp;".
                  "annee_courante=$annee' title=\"".__s('See planning')."\"><img src=\"".
                  $CFG_GLPI["root_doc"]."/pics/reservation-3.png\" alt='' title=''></a>";
            echo "</td></tr>\n";
         }
      }
      echo "</table></div>\n";

      // Print old reservations
      $query = "SELECT `begin`, `end`, `items_id`, `glpi_reservationitems`.`entities_id`,
                       `users_id`, `glpi_reservations`.`comment`, `reservationitems_id`,
                       `completename`
                FROM `glpi_reservations`
                LEFT JOIN `glpi_reservationitems`
                  ON `glpi_reservations`.`reservationitems_id` = `glpi_reservationitems`.`id`
                LEFT JOIN `glpi_entities`
                  ON  `glpi_reservationitems`.`entities_id` = `glpi_entities`.`id`
                WHERE `end` <= '".$now."'
                      AND `users_id` = '$ID'
                ORDER BY `begin` DESC";
      $result = $DB->query($query);

      echo "<div class='spaced'>";
      echo "<table class='tab_cadre_fixehov'>";
      echo "<tr><th colspan='6'>".__('Past reservations')."</th></tr>\n";

      if ($DB->numrows($result) == 0) {
         echo "<tr class='tab_bg_2'>";
         echo "<td class='center' colspan='6'>".__('No reservation')."</td></tr>\n";

      } else {
         echo "<tr><th>".__('Start date')."</th>";
         echo "<th>".__('End date')."</th>";
         echo "<th>".__('Item')."</th>";
         echo "<th>".__('Entity')."</th>";
         echo "<th>".__('By')."</th>";
         echo "<th>".__('Comments')."</th><th>&nbsp;</th></tr>\n";

         while ($data = $DB->fetch_assoc($result)) {
            echo "<tr class='tab_bg_2'>";
            echo "<td class='center'>".Html::convDateTime($data["begin"])."</td>";
            echo "<td class='center'>".Html::convDateTime($data["end"])."</td>";

            if ($ri->getFromDB($data["reservationitems_id"])) {
               $link = "&nbsp;";

               if ($item = getItemForItemtype($ri->fields['itemtype'])) {
                  if ($item->getFromDB($ri->fields['items_id'])) {
                     $link = $item->getLink();
                  }
               }
               echo "<td class='center'>$link</td>";
               echo "<td class='center'>".$data['completename']."</td>";

            } else {
               echo "<td class='center'>&nbsp;</td>";
            }

            echo "<td class='center'>".getUserName($data["users_id"])."</td>";
            echo "<td class='center'>".nl2br($data["comment"])."</td>";
            echo "<td class='center'>";
            list($annee, $mois, $jour) = explode("-", $data["begin"]);
            echo "<a href='".$CFG_GLPI["root_doc"]."/front/reservation.php?reservationitems_id=".
                  $data["reservationitems_id"]."&amp;mois_courant=$mois&amp;annee_courante=$annee' ".
                  "title=\"".__s('See planning')."\">";
            echo "<img src='".$CFG_GLPI["root_doc"]."/pics/reservation-3.png' alt='' title=''></a>";
            echo "</td></tr>\n";
         }
      }
      echo "</table></div>\n";
   }


}
