class.ilBookingProcessGUI.php

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<?php

/* Copyright (c) 1998-2019 ILIAS open source, Extended GPL, see docs/LICENSE */

class ilBookingProcessGUI
{
    protected $pool;

    protected $booking_object_id;

    protected $user_id_to_book;

    protected $user_id_assigner;

    protected $seed;

    protected $help;

    protected $context_obj_id;

    public function __construct(
        ilObjBookingPool $pool,
        int $booking_object_id,
        ilBookingHelpAdapter $help,
        string $seed = "",
        string $sseed = "",
        int $context_obj_id = 0
    ) {
        global $DIC;

        $this->ctrl = $DIC->ctrl();
        $this->tpl = $DIC["tpl"];
        $this->lng = $DIC->language();
        $this->access = $DIC->access();
        $this->tabs_gui = $DIC->tabs();
        $this->user = $DIC->user();
        $this->help = $help;

        $this->context_obj_id = $context_obj_id;

        $this->book_obj_id = $booking_object_id;

        $this->pool = $pool;

        $this->seed = $seed;
        $this->sseed = $sseed;

        $this->rsv_ids = explode(";", $_REQUEST["rsv_ids"]);


        $this->user_id_assigner = $this->user->getId();
        if ($_GET['bkusr']) {
            $this->user_id_to_book = (int) $_GET['bkusr'];
        } else {
            $this->user_id_to_book = $this->user_id_assigner; // by default user books his own booking objects.
        }
        $this->ctrl->saveParameter($this, ["bkusr"]);
    }

    public function executeCommand()
    {
        $ctrl = $this->ctrl;

        $next_class = $ctrl->getNextClass($this);
        $cmd = $ctrl->getCmd("show");
        switch ($next_class) {
            default:
                if (in_array($cmd, array("book", "back",
                    "assignParticipants",
                    "bookMultipleParticipants",
                    "saveMultipleBookings",
                    "confirmedBooking",
                    "confirmBookingNumbers",
                    "confirmedBookingNumbers",
                    "displayPostInfo",
                    "deliverPostFile"
            ))) {
                    $this->$cmd();
                }
        }
    }

    protected function back()   // ok
    {
        $this->ctrl->returnToParent($this);
    }

    protected function setHelpId(string $a_id)
    {
        $this->help->setHelpId($a_id);
    }

    protected function checkPermissionBool($a_perm)
    {
        $ilAccess = $this->access;

        if (!$ilAccess->checkAccess($a_perm, "", $this->pool->getRefId())) {
            return false;
        }
        return true;
    }

    protected function checkPermission($a_perm)
    {
        if (!$this->checkPermissionBool($a_perm)) {
            ilUtil::sendFailure($this->lng->txt("no_permission"), true);
            $this->back();
        }
    }

    //
    // Step 1
    //


    public function book() // ok
    {
        $tpl = $this->tpl;

        $this->tabs_gui->clearTargets();
        $this->tabs_gui->setBackTarget($this->lng->txt('book_back_to_list'), $this->ctrl->getLinkTarget($this, 'back'));

        $this->setHelpId("book");

        $obj = new ilBookingObject($this->book_obj_id);

        $this->lng->loadLanguageModule("dateplaner");
        $this->ctrl->setParameter($this, 'object_id', $obj->getId());

        if ($this->user_id_to_book != $this->user_id_assigner) {
            $this->ctrl->setParameter($this, 'bkusr', $this->user_id_to_book);
        }

        if ($this->pool->getScheduleType() == ilObjBookingPool::TYPE_FIX_SCHEDULE) {
            $schedule = new ilBookingSchedule($obj->getScheduleId());

            $tpl->setContent($this->renderSlots($schedule, array($obj->getId()), $obj->getTitle()));
        } else {
            $cgui = new ilConfirmationGUI();
            $cgui->setHeaderText($this->lng->txt("book_confirm_booking_no_schedule"));

            $cgui->setFormAction($this->ctrl->getFormAction($this));
            $cgui->setCancel($this->lng->txt("cancel"), "back");
            $cgui->setConfirm($this->lng->txt("confirm"), "confirmedBooking");

            $cgui->addItem("object_id", $obj->getId(), $obj->getTitle());

            $tpl->setContent($cgui->getHTML());
        }
    }

    protected function renderSlots(ilBookingSchedule $schedule, array $object_ids, string $title) // ok
    {
        $ilUser = $this->user;

        // fix
        if (!$schedule->getRaster()) {
            $mytpl = new ilTemplate('tpl.booking_reservation_fix.html', true, true, 'Modules/BookingManager');

            $mytpl->setVariable('FORM_ACTION', $this->ctrl->getFormAction($this));
            $mytpl->setVariable('TXT_TITLE', $this->lng->txt('book_reservation_title'));
            $mytpl->setVariable('TXT_INFO', $this->lng->txt('book_reservation_fix_info'));
            $mytpl->setVariable('TXT_OBJECT', $title);
            $mytpl->setVariable('TXT_CMD_BOOK', $this->lng->txt('book_confirm_booking'));
            $mytpl->setVariable('TXT_CMD_CANCEL', $this->lng->txt('cancel'));

            $user_settings = ilCalendarUserSettings::_getInstanceByUserId($ilUser->getId());

            $morning_aggr = $user_settings->getDayStart();
            $evening_aggr = $user_settings->getDayEnd();
            $hours = array();
            for ($i = $morning_aggr;$i <= $evening_aggr;$i++) {
                switch ($user_settings->getTimeFormat()) {
                    case ilCalendarSettings::TIME_FORMAT_24:
                        if ($morning_aggr > 0 && $i == $morning_aggr) {
                            $hours[$i] = sprintf('%02d:00', 0) . "-";
                        }
                        $hours[$i] .= sprintf('%02d:00', $i);
                        if ($evening_aggr < 23 && $i == $evening_aggr) {
                            $hours[$i] .= "-" . sprintf('%02d:00', 23);
                        }
                        break;

                    case ilCalendarSettings::TIME_FORMAT_12:
                        if ($morning_aggr > 0 && $i == $morning_aggr) {
                            $hours[$i] = date('h a', mktime(0, 0, 0, 1, 1, 2000)) . "-";
                        }
                        $hours[$i] .= date('h a', mktime($i, 0, 0, 1, 1, 2000));
                        if ($evening_aggr < 23 && $i == $evening_aggr) {
                            $hours[$i] .= "-" . date('h a', mktime(23, 0, 0, 1, 1, 2000));
                        }
                        break;
                }
            }

            if ($this->seed != "") {
                $find_first_open = false;
                $seed = new ilDate($this->seed, IL_CAL_DATE);
            } else {
                $find_first_open = true;
                $seed = ($this->sseed != "")
                    ? new ilDate($this->sseed, IL_CAL_DATE)
                    : new ilDate(time(), IL_CAL_UNIX);
            }

            $week_start = $user_settings->getWeekStart();

            if (!$find_first_open) {
                $dates = array();
                $this->buildDatesBySchedule($week_start, $hours, $schedule, $object_ids, $seed, $dates);
            } else {
                $dates = array();

                //loop for 1 week
                $has_open_slot = $this->buildDatesBySchedule($week_start, $hours, $schedule, $object_ids, $seed, $dates);

                // find first open slot
                if (!$has_open_slot) {
                    // 1 year is limit for search
                    $limit = clone($seed);
                    $limit->increment(ilDate::YEAR, 1);
                    $limit = $limit->get(IL_CAL_UNIX);

                    while (!$has_open_slot && $seed->get(IL_CAL_UNIX) < $limit) {
                        $seed->increment(ilDate::WEEK, 1);

                        $dates = array();
                        $has_open_slot = $this->buildDatesBySchedule($week_start, $hours, $schedule, $object_ids, $seed, $dates);
                    }
                }
            }

            $navigation = new ilCalendarHeaderNavigationGUI($this, $seed, ilDateTime::WEEK, 'book');
            $mytpl->setVariable('NAVIGATION', $navigation->getHTML());

            foreach (ilCalendarUtil::_buildWeekDayList($seed, $week_start)->get() as $date) {
                $date_info = $date->get(IL_CAL_FKT_GETDATE, '', 'UTC');

                $mytpl->setCurrentBlock('weekdays');
                $mytpl->setVariable('TXT_WEEKDAY', ilCalendarUtil:: _numericDayToString($date_info['wday']));
                $mytpl->setVariable('TXT_DATE', $date_info['mday'] . ' ' . ilCalendarUtil:: _numericMonthToString($date_info['mon']));
                $mytpl->parseCurrentBlock();
            }

            $color = array();
            $all = ilCalendarAppointmentColors::_getColorsByType('crs');
            for ($loop = 0; $loop < 7; $loop++) {
                $col = $all[$loop];
                $fnt = ilCalendarUtil::calculateFontColor($col);
                $color[$loop + 1] = 'border-bottom: 1px solid ' . $col . '; background-color: ' . $col . '; color: ' . $fnt;
            }

            $counter = 0;
            foreach ($dates as $hour => $days) {
                $caption = $days;
                $caption = array_shift($caption);

                for ($loop = 1; $loop < 8; $loop++) {
                    if (!isset($days[$loop])) {
                        $mytpl->setCurrentBlock('dates');
                        $mytpl->setVariable('DUMMY', '&nbsp;');
                        $mytpl->parseCurrentBlock();
                    } else {
                        if (isset($days[$loop]['captions'])) {
                            foreach ($days[$loop]['captions'] as $slot_id => $slot_caption) {
                                $mytpl->setCurrentBlock('choice');
                                $mytpl->setVariable('TXT_DATE', $slot_caption);
                                $mytpl->setVariable('VALUE_DATE', $slot_id);
                                $mytpl->setVariable('DATE_COLOR', $color[$loop]);
                                $mytpl->setVariable(
                                    'TXT_AVAILABLE',
                                    sprintf(
                                        $this->lng->txt('book_reservation_available'),
                                        $days[$loop]['available'][$slot_id]
                                    )
                                );
                                $mytpl->parseCurrentBlock();
                            }

                            $mytpl->setCurrentBlock('dates');
                            $mytpl->setVariable('DUMMY', '');
                            $mytpl->parseCurrentBlock();
                        } elseif (isset($days[$loop]['in_slot'])) {
                            $mytpl->setCurrentBlock('dates');
                            $mytpl->setVariable('DATE_COLOR', $color[$loop]);
                            $mytpl->parseCurrentBlock();
                        } else {
                            $mytpl->setCurrentBlock('dates');
                            $mytpl->setVariable('DUMMY', '&nbsp;');
                            $mytpl->parseCurrentBlock();
                        }
                    }
                }

                $mytpl->setCurrentBlock('slots');
                $mytpl->setVariable('TXT_HOUR', $caption);
                if ($counter % 2) {
                    $mytpl->setVariable('CSS_ROW', 'tblrow1');
                } else {
                    $mytpl->setVariable('CSS_ROW', 'tblrow2');
                }
                $mytpl->parseCurrentBlock();

                $counter++;
            }
        }

        return $mytpl->get();
    }

    protected function buildDatesBySchedule($week_start, array $hours, ilBookingSchedule $schedule, array $object_ids, $seed, array &$dates) // ok
    {
        $ilUser = $this->user;

        $user_settings = ilCalendarUserSettings::_getInstanceByUserId($ilUser->getId());

        $map = array('mo', 'tu', 'we', 'th', 'fr', 'sa', 'su');
        $definition = $schedule->getDefinition();

        $av_from = ($schedule->getAvailabilityFrom() && !$schedule->getAvailabilityFrom()->isNull())
            ? $schedule->getAvailabilityFrom()->get(IL_CAL_DATE)
            : null;
        $av_to = ($schedule->getAvailabilityTo() && !$schedule->getAvailabilityTo()->isNull())
            ? $schedule->getAvailabilityTo()->get(IL_CAL_DATE)
            : null;

        $has_open_slot = false;
        foreach (ilCalendarUtil::_buildWeekDayList($seed, $week_start)->get() as $date) {
            $date_info = $date->get(IL_CAL_FKT_GETDATE, '', 'UTC');

            #24045 and #24936
            if ($av_from || $av_to) {
                $today = $date->get(IL_CAL_DATE);

                if ($av_from && $av_from > $today) {
                    continue;
                }

                if ($av_to && $av_to < $today) {
                    continue;
                }
            }

            $slots = array();
            if (isset($definition[$map[$date_info['isoday'] - 1]])) {
                $slots = array();
                foreach ($definition[$map[$date_info['isoday'] - 1]] as $slot) {
                    $slot = explode('-', $slot);
                    $slots[] = array('from' => str_replace(':', '', $slot[0]),
                        'to' => str_replace(':', '', $slot[1]));
                }
            }

            $last = array_pop(array_keys($hours));
            $slot_captions = array();
            foreach ($hours as $hour => $period) {
                $dates[$hour][0] = $period;

                $period = explode("-", $period);

                // #13738
                if ($user_settings->getTimeFormat() == ilCalendarSettings::TIME_FORMAT_12) {
                    $period[0] = date("H", strtotime($period[0]));
                    if (sizeof($period) == 2) {
                        $period[1] = date("H", strtotime($period[1]));
                    }
                }

                if (sizeof($period) == 1) {
                    $period_from = (int) substr($period[0], 0, 2) . "00";
                    $period_to = (int) substr($period[0], 0, 2) . "59";
                } else {
                    $period_from = (int) substr($period[0], 0, 2) . "00";
                    $period_to = (int) substr($period[1], 0, 2) . "59";
                }

                $column = $date_info['isoday'];
                if (!$week_start) {
                    if ($column < 7) {
                        $column++;
                    } else {
                        $column = 1;
                    }
                }

                if (sizeof($slots)) {
                    $in = false;
                    foreach ($slots as $slot) {
                        $slot_from = mktime(substr($slot['from'], 0, 2), substr($slot['from'], 2, 2), 0, $date_info["mon"], $date_info["mday"], $date_info["year"]);
                        $slot_to = mktime(substr($slot['to'], 0, 2), substr($slot['to'], 2, 2), 0, $date_info["mon"], $date_info["mday"], $date_info["year"]);

                        // always single object, we can sum up
                        $nr_available = (array) ilBookingReservation::getAvailableObject($object_ids, $slot_from, $slot_to - 1, false, true);

                        // any objects available?
                        if (!array_sum($nr_available)) {
                            continue;
                        }

                        // check deadline
                        if ($schedule->getDeadline() >= 0) {
                            // 0-n hours before slots begins
                            if ($slot_from < (time() + $schedule->getDeadline() * 60 * 60)) {
                                continue;
                            }
                        } else {
                            // running slots can be booked, only ended slots are invalid
                            if ($slot_to < time()) {
                                continue;
                            }
                        }

                        // is slot active in current hour?
                        if ((int) $slot['from'] < $period_to && (int) $slot['to'] > $period_from) {
                            $from = ilDatePresentation::formatDate(new ilDateTime($slot_from, IL_CAL_UNIX));
                            $from = array_pop(explode(' ', $from));
                            $to = ilDatePresentation::formatDate(new ilDateTime($slot_to, IL_CAL_UNIX));
                            $to = array_pop(explode(' ', $to));

                            // show caption (first hour) of slot
                            $id = $slot_from . '_' . $slot_to;
                            if (!in_array($id, $slot_captions)) {
                                $dates[$hour][$column]['captions'][$id] = $from . '-' . $to;
                                $dates[$hour][$column]['available'][$id] = array_sum($nr_available);
                                $slot_captions[] = $id;
                            }

                            $in = true;
                        }
                    }
                    // (any) active slot
                    if ($in) {
                        $has_open_slot = true;
                        $dates[$hour][$column]['in_slot'] = $in;
                    }
                }
            }
        }

        return $has_open_slot;
    }

    //
    // Step 1a)
    //
    // Assign multiple participants (starting from participants screen) (no, from object screen!)
    //

    //Table to assing participants to an object.
    public function assignParticipants()
    {
        $this->tabs_gui->clearTargets();
        $this->tabs_gui->setBackTarget($this->lng->txt('book_back_to_list'), $this->ctrl->getLinkTarget($this, 'back'));

        $table = new ilBookingAssignParticipantsTableGUI($this, 'assignParticipants', $this->pool->getRefId(), $this->pool->getId(), $this->book_obj_id);

        $this->tpl->setContent($table->getHTML());
    }

    public function bookMultipleParticipants()
    {
        if ($_POST["mass"]) {
            $participants = $_POST["mass"];
        } else {
            $this->back();
        }

        $this->tabs_gui->clearTargets();
        $this->tabs_gui->setBackTarget($this->lng->txt("back"), $this->ctrl->getLinkTarget($this, 'assignparticipants'));

        $conf = new ilConfirmationGUI();
        $conf->setFormAction($this->ctrl->getFormAction($this));

        //add user list as items.
        foreach ($participants as $id) {
            $name = ilObjUser::_lookupFullname($id);
            $conf->addItem("participants[]", $id, $name);
        }

        $available = ilBookingReservation::numAvailableFromObjectNoSchedule($this->book_obj_id);
        if (sizeof($participants) > $available) {
            $obj = new ilBookingObject($this->book_obj_id);
            $conf->setHeaderText(
                sprintf(
                    $this->lng->txt('book_limit_objects_available'),
                    sizeof($participants),
                    $obj->getTitle(),
                    $available
                )
            );
        } else {
            $conf->setHeaderText($this->lng->txt('book_confirm_booking_no_schedule'));
            $conf->addHiddenItem("object_id", $this->book_obj_id);
            $conf->setConfirm($this->lng->txt("assign"), "saveMultipleBookings");
        }

        $conf->setCancel($this->lng->txt("cancel"), 'redirectToList');
        $this->tpl->setContent($conf->getHTML());
    }

    public function redirectToList()
    {
        $this->ctrl->redirect($this, 'assignParticipants');
    }

    public function saveMultipleBookings()
    {
        if ($_POST["participants"] && $_POST['object_id']) {
            $participants = $_POST["participants"];
            $this->book_obj_id = $_POST['object_id'];
        } else {
            $this->back();
        }
        $rsv_ids = array();
        foreach ($participants as $id) {
            $this->user_id_to_book = $id;
            $rsv_ids[] = $this->processBooking($this->book_obj_id);
        }

        if (sizeof($rsv_ids)) {
            ilUtil::sendSuccess("booking_multiple_succesfully");
            $this->back();
        } else {
            ilUtil::sendFailure($this->lng->txt('book_reservation_failed_overbooked'), true);
            $this->back();
        }
    }


    //
    // Step 2: Confirmation
    //

    public function confirmedBooking() // ok
    {
        $success = false;
        $rsv_ids = array();

        if ($this->pool->getScheduleType() != ilObjBookingPool::TYPE_FIX_SCHEDULE) {
            if ($this->book_obj_id > 0) {
                $object_id = $this->book_obj_id;
                if ($object_id) {
                    if (ilBookingReservation::isObjectAvailableNoSchedule($object_id) &&
                        !ilBookingReservation::getObjectReservationForUser($object_id, $this->user_id_to_book)) { // #18304
                        $rsv_ids[] = $this->processBooking($object_id);
                        $success = $object_id;
                    } else {
                        // #11852
                        ilUtil::sendFailure($this->lng->txt('book_reservation_failed_overbooked'), true);
                        $this->ctrl->redirect($this, 'back');
                    }
                }
            }
        } else {
            if (!isset($_POST['date'])) {
                ilUtil::sendFailure($this->lng->txt('select_one'));
                $this->book();
                return false;
            }

            // single object reservation(s)
            if ($this->book_obj_id > 0) {
                $confirm = array();

                $object_id = $this->book_obj_id;
                if ($object_id) {
                    $group_id = null;
                    $nr = ilBookingObject::getNrOfItemsForObjects(array($object_id));
                    // needed for recurrence
                    $f = new ilBookingReservationDBRepositoryFactory();
                    $repo = $f->getRepo();
                    $group_id = $repo->getNewGroupId();
                    foreach ($_POST['date'] as $date) {
                        $fromto = explode('_', $date);
                        $fromto[1]--;

                        $counter = ilBookingReservation::getAvailableObject(array($object_id), $fromto[0], $fromto[1], false, true);
                        $counter = $counter[$object_id];
                        if ($counter) {
                            // needed for recurrence
                            $confirm[$object_id . "_" . $fromto[0] . "_" . ($fromto[1] + 1)] = $counter;
                        }
                    }
                }

                if (sizeof($confirm)) {
                    $this->confirmBookingNumbers($confirm, $group_id);
                    return false;
                }
            }
        }

        if ($success) {
            $this->saveParticipant();
            $this->handleBookingSuccess($success, $rsv_ids);
        } else {
            ilUtil::sendFailure($this->lng->txt('book_reservation_failed'), true);
            $this->ctrl->redirect($this, 'book');
        }
        return true;
    }

    protected function saveParticipant()
    {
        $participant = new ilBookingParticipant($this->user_id_to_book, $this->pool->getId());
    }

    public function processBooking($a_object_id, $a_from = null, $a_to = null, $a_group_id = null)
    {
        // #11995
        $this->checkPermission('read');

        $reservation = new ilBookingReservation();
        $reservation->setObjectId($a_object_id);
        $reservation->setUserId($this->user_id_to_book);
        $reservation->setAssignerId($this->user_id_assigner);
        $reservation->setFrom($a_from);
        $reservation->setTo($a_to);
        $reservation->setGroupId($a_group_id);
        $reservation->setContextObjId($this->context_obj_id);
        $reservation->save();

        if ($a_from) {
            $this->lng->loadLanguageModule('dateplaner');
            $def_cat = ilCalendarUtil::initDefaultCalendarByType(ilCalendarCategory::TYPE_BOOK, $this->user_id_to_book, $this->lng->txt('cal_ch_personal_book'), true);

            $object = new ilBookingObject($a_object_id);

            $entry = new ilCalendarEntry;
            $entry->setStart(new ilDateTime($a_from, IL_CAL_UNIX));
            $entry->setEnd(new ilDateTime($a_to, IL_CAL_UNIX));
            $entry->setTitle($this->lng->txt('book_cal_entry') . ' ' . $object->getTitle());
            $entry->setContextId($reservation->getId());
            $entry->save();

            $assignment = new ilCalendarCategoryAssignments($entry->getEntryId());
            $assignment->addAssignment($def_cat->getCategoryId());
        }

        return $reservation->getId();
    }

    //
    // Confirm booking numbers
    //

    public function confirmBookingNumbers(array $a_objects_counter, $a_group_id, ilPropertyFormGUI $a_form = null)
    {
        $tpl = $this->tpl;

        $this->tabs_gui->clearTargets();
        $this->tabs_gui->setBackTarget($this->lng->txt('book_back_to_list'), $this->ctrl->getLinkTarget($this, 'back'));

        if (!$a_form) {
            $a_form = $this->initBookingNumbersForm($a_objects_counter, $a_group_id);
        }

        $tpl->setContent($a_form->getHTML());
    }


    protected function initBookingNumbersForm(array $a_objects_counter, $a_group_id, $a_reload = false)
    {
        $form = new ilPropertyFormGUI();
        $form->setFormAction($this->ctrl->getFormAction($this, "confirmedBooking"));
        $form->setTitle($this->lng->txt("book_confirm_booking_schedule_number_of_objects"));
        $form->setDescription($this->lng->txt("book_confirm_booking_schedule_number_of_objects_info"));

        $section = false;
        $min_date = null;
        foreach ($a_objects_counter as $id => $counter) {
            $id = explode("_", $id);
            $book_id = $id[0] . "_" . $id[1] . "_" . $id[2] . "_" . $counter;

            $obj = new ilBookingObject($id[0]);

            if (!$section) {
                $section = new ilFormSectionHeaderGUI();
                $section->setTitle($obj->getTitle());
                $form->addItem($section);

                $section = true;
            }

            $period = /* $this->lng->txt("book_period").": ". */
                ilDatePresentation::formatPeriod(
                    new ilDateTime($id[1], IL_CAL_UNIX),
                    new ilDateTime($id[2], IL_CAL_UNIX)
                );

            $nr_field = new ilNumberInputGUI($period, "conf_nr__" . $book_id);
            $nr_field->setValue(1);
            $nr_field->setSize(3);
            $nr_field->setMaxValue($counter);
            $nr_field->setMinValue($counter ? 1 : 0);
            $nr_field->setRequired(true);
            $form->addItem($nr_field);

            if (!$min_date || $id[1] < $min_date) {
                $min_date = $id[1];
            }
        }

        // recurrence
        $this->lng->loadLanguageModule("dateplaner");
        $rec_mode = new ilSelectInputGUI($this->lng->txt("cal_recurrences"), "recm");
        $rec_mode->setRequired(true);
        $rec_mode->setOptions(array(
            "-1" => $this->lng->txt("cal_no_recurrence"),
            1 => $this->lng->txt("cal_weekly"),
            2 => $this->lng->txt("r_14"),
            4 => $this->lng->txt("r_4_weeks")
        ));
        $form->addItem($rec_mode);

        $rec_end = new ilDateTimeInputGUI($this->lng->txt("cal_repeat_until"), "rece");
        $rec_end->setRequired(true);
        $rec_mode->addSubItem($rec_end);

        if (!$a_reload) {
            // show date only if active recurrence
            $rec_mode->setHideSubForm(true, '>= 1');

            if ($min_date) {
                $rec_end->setDate(new ilDateTime($min_date, IL_CAL_UNIX));
            }
        } else {
            // recurrence may not be changed on reload
            $rec_mode->setDisabled(true);
            $rec_end->setDisabled(true);
        }

        if ($a_group_id) {
            $grp = new ilHiddenInputGUI("grp_id");
            $grp->setValue($a_group_id);
            $form->addItem($grp);
        }

        if ($this->user_id_assigner != $this->user_id_to_book) {
            $usr = new ilHiddenInputGUI("bkusr");
            $usr->setValue($this->user_id_to_book);
            $form->addItem($usr);
        }

        $form->addCommandButton("confirmedBookingNumbers", $this->lng->txt("confirm"));
        $form->addCommandButton("back", $this->lng->txt("cancel"));

        return $form;
    }

    public function confirmedBookingNumbers() // ok
    {

        //get the user who will get the booking.
        if ($_POST['bkusr']) {
            $this->user_id_to_book = (int) $_POST['bkusr'];
        }

        // convert post data to initial form config
        $counter = array();
        $current_first = $obj_id = null;
        foreach (array_keys($_POST) as $id) {
            if (substr($id, 0, 9) == "conf_nr__") {
                $id = explode("_", substr($id, 9));
                $counter[$id[0] . "_" . $id[1] . "_" . $id[2]] = (int) $id[3];
                if (!$current_first) {
                    $current_first = date("Y-m-d", $id[1]);
                }
            }
        }

        // recurrence

        // checkInput() has not been called yet, so we have to improvise
        $end = ilCalendarUtil::parseIncomingDate($_POST["rece"], null);

        if ((int) $_POST["recm"] > 0 && $end && $current_first) {
            ksort($counter);
            $end = $end->get(IL_CAL_DATE);
            $cycle = (int) $_POST["recm"] * 7;
            $cut = 0;
            $org = $counter;
            while ($cut < 1000 && $this->addDaysDate($current_first, $cycle) <= $end) {
                $cut++;
                $current_first = null;
                foreach ($org as $item_id => $max) {
                    $parts = explode("_", $item_id);
                    $obj_id = $parts[0];

                    $from = $this->addDaysStamp($parts[1], $cycle * $cut);
                    $to = $this->addDaysStamp($parts[2], $cycle * $cut);

                    $new_item_id = $obj_id . "_" . $from . "_" . $to;

                    // form reload because of validation errors
                    if (!isset($counter[$new_item_id]) && date("Y-m-d", $to) <= $end) {
                        // get max available for added dates
                        $new_max = ilBookingReservation::getAvailableObject(array($obj_id), $from, $to - 1, false, true);
                        $new_max = (int) $new_max[$obj_id];

                        $counter[$new_item_id] = $new_max;

                        if (!$current_first) {
                            $current_first = date("Y-m-d", $from);
                        }

                        // clone input
                        $_POST["conf_nr__" . $new_item_id . "_" . $new_max] = $_POST["conf_nr__" . $item_id . "_" . $max];
                    }
                }
            }
        }

        $group_id = $_POST["grp_id"];

        $form = $this->initBookingNumbersForm($counter, $group_id, true);
        if ($form->checkInput()) {
            $success = false;
            $rsv_ids = array();
            foreach ($counter as $id => $all_nr) {
                $book_nr = $form->getInput("conf_nr__" . $id . "_" . $all_nr);
                $parts = explode("_", $id);
                $obj_id = $parts[0];
                $from = $parts[1];
                $to = $parts[2] - 1;

                // get currently available slots
                $counter = ilBookingReservation::getAvailableObject(array($obj_id), $from, $to, false, true);
                $counter = $counter[$obj_id];
                if ($counter) {
                    // we can only book what is left
                    $book_nr = min($book_nr, $counter);
                    for ($loop = 0; $loop < $book_nr; $loop++) {
                        $rsv_ids[] = $this->processBooking($obj_id, $from, $to, $group_id);
                        $success = $obj_id;
                    }
                }
            }
            if ($success) {
                $this->saveParticipant();
                $this->handleBookingSuccess($success, $rsv_ids);
            } else {
                ilUtil::sendFailure($this->lng->txt('book_reservation_failed'), true);
                $this->back();
            }
        } else {
            // ilDateTimeInputGUI does NOT add hidden values on disabled!

            $rece_array = explode(".", $_POST['rece']);

            $rece_day = str_pad($rece_array[0], 2, "0", STR_PAD_LEFT);
            $rece_month = str_pad($rece_array[1], 2, "0", STR_PAD_LEFT);
            $rece_year = $rece_array[2];

            // ilDateTimeInputGUI will choke on POST array format
            $_POST["rece"] = null;

            $form->setValuesByPost();

            $rece_date = new ilDate($rece_year . "-" . $rece_month . "-" . $rece_day, IL_CAL_DATE);

            $form->getItemByPostVar("rece")->setDate($rece_date);
            $form->getItemByPostVar("recm")->setHideSubForm($_POST["recm"] < 1);

            $hidden_date = new ilHiddenInputGUI("rece");
            $hidden_date->setValue($rece_date);
            $form->addItem($hidden_date);

            $this->confirmBookingNumbers($counter, $group_id, $form);
        }
    }

    protected function addDaysDate($a_date, $a_days)
    {
        $date = date_parse($a_date);
        $stamp = mktime(0, 0, 1, $date["month"], $date["day"] + $a_days, $date["year"]);
        return date("Y-m-d", $stamp);
    }

    protected function addDaysStamp($a_stamp, $a_days)
    {
        $date = getDate($a_stamp);
        return mktime(
            $date["hours"],
            $date["minutes"],
            $date["seconds"],
            $date["mon"],
            $date["mday"] + $a_days,
            $date["year"]
        );
    }

    //
    // Step 3: Display post success info
    //

    protected function handleBookingSuccess($a_obj_id, array $a_rsv_ids = null)
    {
        ilUtil::sendSuccess($this->lng->txt('book_reservation_confirmed'), true);

        // show post booking information?
        $obj = new ilBookingObject($a_obj_id);
        $pfile = $obj->getPostFile();
        $ptext = $obj->getPostText();

        if (trim($ptext) || $pfile) {
            if (sizeof($a_rsv_ids)) {
                $this->ctrl->setParameter($this, 'rsv_ids', implode(";", $a_rsv_ids));
            }
            $this->ctrl->redirect($this, 'displayPostInfo');
        } else {
            $this->back();
        }
    }

    public function displayPostInfo()
    {
        $tpl = $this->tpl;
        $lng = $this->lng;
        $ilCtrl = $this->ctrl;
        $id = $this->book_obj_id;
        if (!$id) {
            return;
        }

        // placeholder

        $book_ids = ilBookingReservation::getObjectReservationForUser($id, $this->user_id_assigner, true);
        $tmp = array();
        foreach ($book_ids as $book_id) {
            if (in_array($book_id, $this->rsv_ids)) {
                $obj = new ilBookingReservation($book_id);
                $from = $obj->getFrom();
                $to = $obj->getTo();
                if ($from > time()) {
                    $tmp[$from . "-" . $to]++;
                }
            }
        }

        $olddt = ilDatePresentation::useRelativeDates();
        ilDatePresentation::setUseRelativeDates(false);

        $period = array();
        ksort($tmp);
        foreach ($tmp as $time => $counter) {
            $time = explode("-", $time);
            $time = ilDatePresentation::formatPeriod(
                new ilDateTime($time[0], IL_CAL_UNIX),
                new ilDateTime($time[1], IL_CAL_UNIX)
            );
            if ($counter > 1) {
                $time .= " (" . $counter . ")";
            }
            $period[] = $time;
        }
        $book_id = array_shift($book_ids);

        ilDatePresentation::setUseRelativeDates($olddt);


        /*
        #23578 since Booking pool participants.
        $obj = new ilBookingReservation($book_id);
        if ($obj->getUserId() != $ilUser->getId())
        {
            return;
        }
        */

        $obj = new ilBookingObject($id);
        $pfile = $obj->getPostFile();
        $ptext = $obj->getPostText();

        $mytpl = new ilTemplate('tpl.booking_reservation_post.html', true, true, 'Modules/BookingManager/BookingProcess');
        $mytpl->setVariable("TITLE", $lng->txt('book_post_booking_information'));

        if ($ptext) {
            // placeholder
            $ptext = str_replace("[OBJECT]", $obj->getTitle(), $ptext);
            $ptext = str_replace("[PERIOD]", implode("<br />", $period), $ptext);

            $mytpl->setVariable("POST_TEXT", nl2br($ptext));
        }

        if ($pfile) {
            $url = $ilCtrl->getLinkTarget($this, 'deliverPostFile');

            $mytpl->setVariable("DOWNLOAD", $lng->txt('download'));
            $mytpl->setVariable("URL_FILE", $url);
            $mytpl->setVariable("TXT_FILE", $pfile);
        }

        $mytpl->setVariable("TXT_SUBMIT", $lng->txt('ok'));
        $mytpl->setVariable("URL_SUBMIT", $ilCtrl->getLinkTarget($this, "back"));

        $tpl->setContent($mytpl->get());
    }

    public function deliverPostFile()
    {
        $id = $this->book_obj_id;
        if (!$id) {
            return;
        }

        $book_id = ilBookingReservation::getObjectReservationForUser($id, $this->user_id_assigner);
        $obj = new ilBookingReservation($book_id);
        if ($obj->getUserId() != $this->user_id_assigner) {
            return;
        }

        $obj = new ilBookingObject($id);
        $file = $obj->getPostFileFullPath();
        if ($file) {
            ilUtil::deliverFile($file, $obj->getPostFile());
        }
    }
}