class.ilCalendarPresentationGUI.php

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<?php

/* Copyright (c) 1998-2017 ILIAS open source, Extended GPL, see docs/LICENSE */


include_once './Services/Calendar/classes/class.ilCalendarSettings.php';

class ilCalendarPresentationGUI
{
    protected $ctrl;

    protected $lng;

    protected $tpl;

    protected $tabs_gui;

    protected $user;

    protected $help;

    protected $rbacsystem;

    protected $ui;

    protected $toolbar;

    protected $repository_mode = false;

    protected $seed;

    public function __construct($a_ref_id = 0)
    {
        global $DIC;

        $this->ctrl = $DIC->ctrl();
        $this->lng = $DIC->language();
        $this->lng->loadLanguageModule('dateplaner');
        
        $this->tpl = $DIC["tpl"];
        $this->tabs_gui = $DIC->tabs();
        $this->user = $DIC->user();
        $this->rbacsystem = $DIC->rbac()->system();
        $this->help = $DIC["ilHelp"];
        $this->ui = $DIC->ui();
        $this->toolbar = $DIC->toolbar();
        $this->ref_id = $a_ref_id;
        $this->category_id = $_GET["category_id"];
        $this->ctrl->setParameter($this, 'category_id', $_REQUEST['category_id']);

        // show back to pd
        $this->ctrl->saveParameter($this, 'backpd');
        
        include_once('./Services/Calendar/classes/class.ilCalendarCategories.php');
        $cats = ilCalendarCategories::_getInstance($this->user->getId());
        
        include_once './Services/Calendar/classes/class.ilCalendarUserSettings.php';
        if ($a_ref_id > 0) {
            $this->repository_mode = true;
        }
        if ($this->category_id > 0) {           // single calendar view
            // ensure activation of this category
            include_once("./Services/Calendar/classes/class.ilCalendarVisibility.php");
            $vis = ilCalendarVisibility::_getInstanceByUserId($this->user->getId(), $a_ref_id);
            $vis->forceVisibility($this->category_id);

            $cats->initialize(ilCalendarCategories::MODE_SINGLE_CALENDAR, 0, false, $this->category_id);
        } else {
            if ($a_ref_id > 0) {
                $cats->initialize(ilCalendarCategories::MODE_REPOSITORY, (int) $a_ref_id, true);
            } else {
                if (ilCalendarUserSettings::_getInstance()->getCalendarSelectionType() == ilCalendarUserSettings::CAL_SELECTION_MEMBERSHIP) {
                    $cats->initialize(ilCalendarCategories::MODE_PERSONAL_DESKTOP_MEMBERSHIP);
                } else {
                    $cats->initialize(ilCalendarCategories::MODE_PERSONAL_DESKTOP_ITEMS);
                }
            }
        }

        include_once("./Services/Calendar/classes/class.ilCalendarActions.php");
        $this->actions = ilCalendarActions::getInstance();

        $this->cats = $cats;
    }

    public function getRepositoryMode()
    {
        return $this->repository_mode;
    }
    
    protected function initAndRedirectToConsultationHours()
    {
        $visibility = ilCalendarVisibility::_getInstanceByUserId($this->user->getId(), $this->ref_id);
        foreach ($this->cats->getCategoriesInfo() as $info) {
            if (
                $info["type"] == ilCalendarCategory::TYPE_CH &&
                $info["obj_id"] == $_GET["ch_user_id"]
            ) {
                $v = $visibility->getVisible();
                if (!in_array($info["cat_id"], $v)) {
                    $v[] = $info["cat_id"];
                }
                $visibility->showSelected($v);
                $visibility->save();
                $this->ctrl->redirect($this, "");
            }
        }
    }
    
    public function executeCommand()
    {
        $ilUser = $this->user;

        $cmd = $this->ctrl->getCmd();
        // now next class is not empty, which breaks old consultation hour implementation
        $next_class = $this->getNextClass();

        include_once('./Services/Calendar/classes/class.ilCalendarSettings.php');
        if (!ilCalendarSettings::_getInstance()->isEnabled()) {
            ilUtil::sendFailure($this->lng->txt('permission_denied'), true);
            ilUtil::redirect('ilias.php?baseClass=ilPersonalDesktopGUI');
        }

        $this->initSeed();
        $this->prepareOutput();

        $this->help->setScreenIdComponent("cal");
        
        switch ($cmd) {
            case 'selectCHCalendarOfUser':
                $this->initAndRedirectToConsultationHours();
                break;
        }

        switch ($next_class) {
            case 'ilcalendarinboxgui':
                $this->tabs_gui->activateTab('cal_agenda');
                $inbox_gui = $this->forwardToClass('ilcalendarinboxgui');
                if ($this->showToolbarAndSidebar()) {
                    $this->showViewSelection("cal_list");
                    $this->showSideBlocks();
                    $inbox_gui->addToolbarActions();
                }

                break;
                
            case 'ilconsultationhoursgui':
                $this->tabs_gui->activateTab('app_consultation_hours');
                $this->tabs_gui->clearTargets();

                // No side blocks
                $this->tabs_gui->setBackTarget(
                    $this->lng->txt('cal_back_to_cal'),
                    $this->ctrl->getLinkTargetByClass($this->readLastClass())
                );

                include_once './Services/Calendar/classes/ConsultationHours/class.ilConsultationHoursGUI.php';
                $gui = new ilConsultationHoursGUI();
                $this->ctrl->forwardCommand($gui);
                if ($this->showToolbarAndSidebar()) {
                    $this->showSideBlocks();
                }
                return true;
            
            case 'ilcalendarmonthgui':
                $this->tabs_gui->activateTab('cal_agenda');
                $month_gui = $this->forwardToClass('ilcalendarmonthgui');

                if ($this->showToolbarAndSidebar()) {
                    $this->showViewSelection("app_month");
                    $this->showSideBlocks();
                    $month_gui->addToolbarActions();
                }
                break;
                
            case 'ilcalendarweekgui':
                $this->tabs_gui->activateTab('cal_agenda');
                $week_gui = $this->forwardToClass('ilcalendarweekgui');
                if ($this->showToolbarAndSidebar()) {
                    $this->showViewSelection("app_week");
                    $this->showSideBlocks();
                    $week_gui->addToolbarActions();
                }

                break;

            case 'ilcalendardaygui':
                $this->tabs_gui->activateTab('cal_agenda');
                $day_gui = $this->forwardToClass('ilcalendardaygui');
                if ($this->showToolbarAndSidebar()) {
                    $this->showViewSelection("app_day");
                    $this->showSideBlocks();
                    $day_gui->addToolbarActions();
                }
                break;

            case 'ilcalendarusersettingsgui':
                $this->ctrl->setReturn($this, '');
                $this->tabs_gui->activateTab('settings');
                $this->setCmdClass('ilcalendarusersettingsgui');
                
                include_once('./Services/Calendar/classes/class.ilCalendarUserSettingsGUI.php');
                $user_settings = new ilCalendarUserSettingsGUI();
                $this->ctrl->forwardCommand($user_settings);
                // No side blocks
                return true;
                
            case 'ilcalendarappointmentgui':
                $this->ctrl->setReturn($this, '');
                $this->tabs_gui->activateTab($_SESSION['cal_last_tab']);
                
                include_once('./Services/Calendar/classes/class.ilCalendarAppointmentGUI.php');
                $app = new ilCalendarAppointmentGUI($this->seed, $this->seed, (int) $_GET['app_id']);
                $this->ctrl->forwardCommand($app);
                break;

            case 'ilcalendarsubscriptiongui':
                $this->ctrl->setReturn($this, '');
                //$this->tabs_gui->activateTab($_SESSION['cal_last_tab']);
                $this->tabs_gui->activateTab("cal_agenda");
                include_once './Services/Calendar/classes/class.ilCalendarSubscriptionGUI.php';
                $sub = new ilCalendarSubscriptionGUI((int) $_REQUEST['category_id'], (int) $_GET["ref_id"]);
                $this->ctrl->forwardCommand($sub);
                if ($this->showToolbarAndSidebar()) {
                    $this->showSideBlocks();
                }
                break;
                
            case 'ilcalendarcategorygui':
                $this->ctrl->setReturn($this, '');
                $this->tabs_gui->activateTab("cal_manage");
                include_once('Services/Calendar/classes/class.ilCalendarCategoryGUI.php');
                $category = new ilCalendarCategoryGUI($ilUser->getId(), $this->seed, $this->ref_id);
                if ($this->ctrl->forwardCommand($category)) {
                    //$this->tabs_gui->activateTab("cal_manage");

                    // no side blocks
                    return;
                } else {
                    if ($this->getRepositoryMode()) {
                        #$this->tabs_gui->setBackTarget($this->lng->txt("back"), $this->ctrl->getLinkTarget($this, ""));
                    }
                    //$this->tabs_gui->activateTab($_SESSION['cal_last_tab']);
                    $this->showSideBlocks();
                    break;
                }

                // no break
            case 'ilcalendarblockgui':
                $side_cal = new ilCalendarBlockGUI();
                $side_cal->setAvailableDetailLevels(2, 2);
                $side_cal->setRepositoryMode($this->getRepositoryMode());
                $side_cal->setForceMonthView(true);
                $this->ctrl->forwardCommand($side_cal);
                $this->showSideBlocks();
                break;

            case 'ilpdcalendarblockgui':
                $side_cal = new ilPDCalendarBlockGUI();
                $side_cal->setAvailableDetailLevels(2, 2);
                $side_cal->setRepositoryMode($this->getRepositoryMode());
                $side_cal->setForceMonthView(true);
                $this->ctrl->forwardCommand($side_cal);
                $this->showSideBlocks();
                break;

            case 'ilpublicuserprofilegui':
                include_once("./Services/User/classes/class.ilPublicUserProfileGUI.php");
                $user_profile = new ilPublicUserProfileGUI($_GET["user_id"]);
                $html = $this->ctrl->forwardCommand($user_profile);
                $this->tpl->setContent($html);
                break;

            default:
                $cmd = $this->ctrl->getCmd("show");
                $this->$cmd();
                $this->showSideBlocks();
                break;
        }


        $this->synchroniseExternalCalendars();
        
        return true;
    }

    public function showViewSelection($a_active = "cal_list")
    {
        $ui = $this->ui;
        $ctrl = $this->ctrl;
        $lng = $this->lng;
        $toolbar = $this->toolbar;

        $f = $ui->factory();

        $actions = array(
            $lng->txt("app_day") => $ctrl->getLinkTargetByClass('ilCalendarDayGUI', ''),
            $lng->txt("app_week") => $ctrl->getLinkTargetByClass('ilCalendarWeekGUI', ''),
            $lng->txt("app_month") => $ctrl->getLinkTargetByClass('ilCalendarMonthGUI', ''),
            $lng->txt("cal_list") => $ctrl->getLinkTargetByClass('ilCalendarInboxGUI', '')
        );

        $aria_label = $lng->txt("cal_change_calendar_view");
        $view_control = $f->viewControl()->mode($actions, $aria_label)->withActive($lng->txt($a_active));

        $toolbar->addComponent($view_control);

        $ctrl->setParameterByClass("ilcalendarappointmentgui", "seed", $this->seed->get(IL_CAL_DATE, ''));
        $ctrl->setParameterByClass("ilcalendarappointmentgui", "app_id", "");
        $ctrl->setParameterByClass("ilcalendarappointmentgui", "dt", "");

        $extra_button_added = false;
        // add appointment
        if ($this->category_id == 0 || $this->actions->checkAddEvent($this->category_id)) {
            $toolbar->addSeparator();
            $extra_button_added = true;
            $add_button = $f->button()->standard(
                $lng->txt("cal_add_appointment"),
                $ctrl->getLinkTargetByClass("ilcalendarappointmentgui", "add")
            );
            $toolbar->addComponent($add_button);
        }

        // import appointments
        if ($this->category_id > 0 && $this->actions->checkAddEvent($this->category_id)) {
            if (!$extra_button_added) {
                $toolbar->addSeparator();
            }
            $add_button = $f->button()->standard(
                $lng->txt("cal_import_appointments"),
                $ctrl->getLinkTargetByClass("ilcalendarcategorygui", "importAppointments")
            );
            $toolbar->addComponent($add_button);
        }
    }


    public function getNextClass()
    {
        if (strlen($next_class = $this->ctrl->getNextClass())) {
            return $next_class;
        }
        if ($this->ctrl->getCmdClass() == strtolower(get_class($this)) or $this->ctrl->getCmdClass() == '') {
            return $this->readLastClass();
        }
    }
    
    public function readLastClass()
    {
        $ilUser = $this->user;
        
        return $ilUser->getPref('cal_last_class') ? $ilUser->getPref('cal_last_class') : 'ilcalendarinboxgui';
    }
    
    public function setCmdClass($a_class)
    {
        // If cmd class == 'ilcalendarpresentationgui' the cmd class is set to the the new forwarded class
        // otherwise e.g ilcalendarmonthgui tries to forward (back) to ilcalendargui.

        if ($this->ctrl->getCmdClass() == strtolower(get_class($this))) {
            $this->ctrl->setCmdClass(strtolower($a_class));
        }
        return true;
    }
    
    protected function forwardToClass($a_class)
    {
        $ilUser = $this->user;

        switch ($a_class) {
            case 'ilcalendarmonthgui':
                $ilUser->writePref('cal_last_class', $a_class);
                $_SESSION['cal_last_tab'] = 'app_month';
                $this->setCmdClass('ilcalendarmonthgui');
                include_once('./Services/Calendar/classes/class.ilCalendarMonthGUI.php');
                $month_gui = new ilCalendarMonthGUI($this->seed);
                $this->ctrl->forwardCommand($month_gui);
                return $month_gui;
                break;
                
            case 'ilcalendarweekgui':
                $ilUser->writePref('cal_last_class', $a_class);
                $_SESSION['cal_last_tab'] = 'app_week';
                $this->setCmdClass('ilcalendarweekgui');
                include_once('./Services/Calendar/classes/class.ilCalendarWeekGUI.php');
                $week_gui = new ilCalendarWeekGUI($this->seed);
                $this->ctrl->forwardCommand($week_gui);
                return $week_gui;
                break;

            case 'ilcalendardaygui':
                $ilUser->writePref('cal_last_class', $a_class);
                $_SESSION['cal_last_tab'] = 'app_day';
                $this->setCmdClass('ilcalendardaygui');
                include_once('./Services/Calendar/classes/class.ilCalendarDayGUI.php');
                $day_gui = new ilCalendarDayGUI($this->seed);
                $this->ctrl->forwardCommand($day_gui);
                return $day_gui;
                break;
                
            case 'ilcalendarinboxgui':
                #21479
                if ($view_option = $_GET['cal_agenda_per']) {
                    ilSession::set("cal_list_view", $view_option);
                } elseif ($view_option = ilSession::get('cal_list_view')) {
                    ilSession::set("cal_list_view", $view_option);
                }
                $ilUser->writePref('cal_last_class', $a_class);
                $_SESSION['cal_last_tab'] = 'cal_upcoming_events_header';
                $this->setCmdClass('ilcalendarinboxgui');
                include_once('./Services/Calendar/classes/class.ilCalendarInboxGUI.php');
                $inbox_gui = new ilCalendarinboxGUI($this->seed);
                $this->ctrl->forwardCommand($inbox_gui);
                return $inbox_gui;
                break;
        }
    }
    
    protected function loadHistory()
    {
        $ilUser = $this->user;
        
        $this->ctrl->setCmd('');
        $history = $ilUser->getPref('cal_last_class') ? $ilUser->getPref('cal_last_class') : 'ilcalendarmonthgui';
        $this->forwardToClass($history);
    }
    
    protected function showSideBlocks()
    {
        $ilUser = $this->user;
        $ilCtrl = $this->ctrl;

        $tpl = new ilTemplate('tpl.cal_side_block.html', true, true, 'Services/Calendar');
        if ($this->getRepositoryMode()) {
            include_once("./Services/Calendar/classes/class.ilCalendarBlockGUI.php");
            $side_cal = new ilCalendarBlockGUI();
        } else {
            include_once("./Services/Calendar/classes/class.ilPDCalendarBlockGUI.php");
            $side_cal = new ilPDCalendarBlockGUI();
        }
        $side_cal->setAvailableDetailLevels(2, 2);
        $side_cal->setParentGUI("ilCalendarPresentationGUI");
        $side_cal->setForceMonthView(true);
        $side_cal->setRepositoryMode($this->getRepositoryMode());
        $tpl->setVariable('MINICAL', $ilCtrl->getHTML($side_cal));

        include_once('./Services/Calendar/classes/class.ilCalendarCategoryGUI.php');
        $cat = new ilCalendarCategoryGUI($ilUser->getId(), $this->seed, $this->ref_id);
        $tpl->setVariable('CATEGORIES', $ilCtrl->getHTML($cat));

        $this->tpl->setRightContent($tpl->get());
    }
    
    
    public function show()
    {
        $this->tpl->addCss(ilUtil::getStyleSheetLocation('filesystem', 'delos.css', 'Services/Calendar'));
    }

    protected function addCategoryTabs()
    {
        global $DIC;

        $ctrl = $DIC->ctrl();

        $this->tabs_gui->clearTargets();
        $ctrl->setParameterByClass(ilCalendarCategoryGUI::class, "category_id", $_REQUEST["category_id"]);
        if ($this->getRepositoryMode()) {
            $came_from_pd = $_REQUEST['backpd'];
            if ($came_from_pd) {
                $this->tabs_gui->setBack2Target(
                    $this->lng->txt('back_to_pd'),
                    $this->ctrl->getLinkTargetByClass(ilPersonalDesktopGUI::class, 'jumpToCalendar')
                );
            }
            $label = $this->lng->txt('back_to_' . ilObject::_lookupType($this->ref_id, true));
            $this->tabs_gui->setBackTarget(
                $label,
                $this->ctrl->getParentReturn($this)
            );
        } else {
            // no object calendar => back is back to manage view
            if (array_key_exists('backvm', $_REQUEST)) {
                $this->tabs_gui->setBackTarget(
                    $this->lng->txt("back"),
                    $ctrl->getLinkTargetByClass(ilCalendarCategoryGUI::class, 'manage')
                );
            } else {
                $ctrl->clearParameterByClass(ilCalendarPresentationGUI::class, 'category_id');
                $this->tabs_gui->setBackTarget(
                    $this->lng->txt("back"),
                    $ctrl->getLinkTargetByClass('ilcalendarpresentationgui', '')
                );
            }
            $ctrl->setParameterByClass(ilCalendarPresentationGUI::class, "category_id", $_REQUEST["category_id"]);
        }

        $this->tabs_gui->addTab(
            "cal_agenda",
            $this->lng->txt("cal_agenda"),
            $ctrl->getLinkTargetByClass(ilCalendarPresentationGUI::class, "")
        );

        if ($this->actions->checkShareCal($this->category_id)) {
            $this->tabs_gui->addTab(
                "share",
                $this->lng->txt("cal_share"),
                $ctrl->getLinkTargetByClass(ilCalendarCategoryGUI::class, "shareSearch")
            );
        }
        if ($this->actions->checkSettingsCal($this->category_id)) {
            $this->tabs_gui->addTab(
                "edit",
                $this->lng->txt("settings"),
                $ctrl->getLinkTargetByClass(ilCalendarCategoryGUI::class, "edit")
            );
        }

        $this->tabs_gui->activateTab('cal_agenda');
        return true;
    }

    protected function addStandardTabs()
    {
        global $DIC;

        $access = $DIC->access();
        $rbacsystem = $DIC->rbac()->system();

        $came_from_pd = $_REQUEST['backpd'];

        $this->tabs_gui->clearTargets();
        if ($this->getRepositoryMode()) {
            if ($came_from_pd) {
                $this->tabs_gui->setBack2Target(
                    $this->lng->txt('back_to_pd'),
                    $this->ctrl->getLinkTargetByClass(ilPersonalDesktopGUI::class, 'jumpToCalendar')
                );
            }
            $label = $this->lng->txt('back_to_' . ilObject::_lookupType($this->ref_id, true));
            $this->tabs_gui->setBackTarget(
                $label,
                $this->ctrl->getParentReturn($this)
            );

            $obj_id = ilObject::_lookupObjId($this->ref_id);
            $category = ilCalendarCategory::_getInstanceByObjId($obj_id);
            $category_id = $category->getCategoryID();

            // agenda tab
            $this->tabs_gui->addTab(
                'cal_agenda',
                $this->lng->txt('cal_agenda'),
                $this->ctrl->getLinkTarget($this, '')
            );

            // settings tab
            if ($access->checkAccess('edit_event', '', $this->ref_id)) {
                $this->ctrl->setParameterByClass(ilCalendarCategoryGUI::class, 'category_id', $category_id);
                $this->tabs_gui->addTab(
                    'cal_manage',
                    $this->lng->txt('settings'),
                    $this->ctrl->getLinkTargetByClass(ilCalendarCategoryGUI::class, 'edit')
                );
                $this->ctrl->clearParameterByClass(ilCalendarCategoryGUI::class, 'category_id');
            }
            return true;
        } else {
            $this->tabs_gui->addTab(
                'cal_agenda',
                $this->lng->txt("cal_agenda"),
                $this->ctrl->getLinkTarget($this, '')
            );

            if (
                $rbacsystem->checkAccess(
                    'add_consultation_hours',
                    ilCalendarSettings::_getInstance()->getCalendarSettingsId()
                ) &&
                ilCalendarSettings::_getInstance()->areConsultationHoursEnabled()
            ) {
                $this->tabs_gui->addTab(
                    'app_consultation_hours',
                    $this->lng->txt('app_consultation_hours'),
                    $this->ctrl->getLinkTargetByClass(ilConsultationHoursGUI::class, '')
                );
            }
            /*
            $this->tabs_gui->addTab(
                'cal_manage',
                $this->lng->txt('cal_manage'),
                $this->ctrl->getLinkTargetByClass(ilCalendarCategoryGUI::class,'manage')
            );
            $this->tabs_gui->addTab(
                'settings',
                $this->lng->txt('settings'),
                $this->ctrl->getLinkTargetByClass(ilCalendarUserSettings::class,'')
            );
            */
            $this->tabs_gui->addTarget('cal_manage', $this->ctrl->getLinkTargetByClass('ilCalendarCategoryGUI', 'manage'));
            $this->tabs_gui->addTarget('settings', $this->ctrl->getLinkTargetByClass('ilCalendarUserSettingsGUI', ''));
        }
    }


    protected function prepareOutput()
    {
        global $DIC;

        $tpl = $DIC->ui()->mainTemplate();

        if ($this->category_id) {
            $this->addCategoryTabs();
        } else {
            $this->addStandardTabs();
        }

        $tpl->setTitleIcon(ilUtil::getImagePath("icon_cals.svg"));

        // if we are in single calendar view
        if ($this->category_id > 0) {
            global $DIC;

            $tabs = $this->tabs_gui;
            $lng = $this->lng;
            $ctrl = $this->ctrl;
            $tpl = $DIC["tpl"];

            $category = new ilCalendarCategory($this->category_id);

            // Set header
            $header = "";
            switch ($category->getType()) {
                case ilCalendarCategory::TYPE_USR:
                    $header = $this->lng->txt('cal_type_personal') . ": " . $category->getTitle();
                    break;

                case ilCalendarCategory::TYPE_GLOBAL:
                    $header = $this->lng->txt('cal_type_system') . ": " . $category->getTitle();
                    break;

                case ilCalendarCategory::TYPE_OBJ:
                    $header = $this->lng->txt('cal_type_' . $category->getObjType()) . ": " . $category->getTitle();
                    break;

                case ilCalendarCategory::TYPE_CH:
                    $header = str_replace("%1", ilObjUser::_lookupFullname($category->getObjId()), $lng->txt("cal_consultation_hours_for_user"));
                    break;

                case ilCalendarCategory::TYPE_BOOK:
                    $header = $category->getTitle();
                    break;
            }
            $tpl->setTitleIcon(ilUtil::getImagePath("icon_cals.svg"));
            $tpl->setTitle($header);

            $this->action_menu = new ilAdvancedSelectionListGUI();
            $this->action_menu->setAsynch(false);
            $this->action_menu->setAsynchUrl('');
            $this->action_menu->setListTitle($lng->txt('actions'));
            $this->action_menu->setId('act_cal');
            $this->action_menu->setSelectionHeaderClass('small');
            $this->action_menu->setItemLinkClass('xsmall');
            $this->action_menu->setLinksMode('il_ContainerItemCommand2');
            $this->action_menu->setHeaderIcon(ilAdvancedSelectionListGUI::DOWN_ARROW_DARK);
            $this->action_menu->setUseImages(false);

            // iCal-Url
            $ctrl->setParameterByClass("ilcalendarsubscriptiongui", "category_id", $this->category_id);
            $this->action_menu->addItem($lng->txt("cal_ical_url"), "", $ctrl->getLinkTargetByClass("ilcalendarsubscriptiongui", ""));

            // delete action
            if ($this->actions->checkDeleteCal($this->category_id)) {
                $ctrl->setParameterByClass("ilcalendarcategorygui", "category_id", $this->category_id);
                $this->action_menu->addItem($lng->txt("cal_delete_cal"), "", $ctrl->getLinkTargetByClass("ilcalendarcategorygui", "confirmDelete"));
            }

            $tpl->setHeaderActionMenu($this->action_menu->getHTML());
        }
    }

    public function initSeed()
    {
        // default to today
        $now = new \ilDate(time(), IL_CAL_UNIX);
        $this->seed = new \ilDate($now->get(IL_CAL_DATE), IL_CAL_DATE);
        if (array_key_exists('seed', $_REQUEST)) {
            $this->seed = new ilDate($_GET['seed'], IL_CAL_DATE);
        } elseif (!$this->getRepositoryMode()) {
            $session_seed = ilSession::get('cal_seed');
            if ($session_seed) {
                $this->seed = new ilDate($session_seed, IL_CAL_DATE);
            }
        }
        $this->ctrl->setParameter($this, 'seed', $this->seed->get(IL_CAL_DATE));
        ilSession::set('cal_seed', $this->seed->get(IL_CAL_DATE));
    }
    
    protected function synchroniseExternalCalendars()
    {
        $ilUser = $this->user;

        if (!ilCalendarSettings::_getInstance()->isWebCalSyncEnabled()) {
            return false;
        }
        // @todo make this thread safe
        
        $limit = new ilDateTime(time(), IL_CAL_UNIX);
        $limit->increment(IL_CAL_HOUR, -1 * ilCalendarSettings::_getInstance()->getWebCalSyncHours());
        
        $cats = ilCalendarCategories::_getInstance($ilUser->getId());
        foreach ($cats->getCategoriesInfo() as $cat_id => $info) {
            if ($info['remote']) {
                // Check for execution
                $category = new ilCalendarCategory($cat_id);
                
                if (ilDateTime::_before($category->getRemoteSyncLastExecution(), $limit)) {
                    // update in any case to avoid multiple updates of invalid calendar sources.
                    $category->setRemoteSyncLastExecution(new ilDateTime(time(), IL_CAL_UNIX));
                    $category->update();

                    include_once './Services/Calendar/classes/class.ilCalendarRemoteReader.php';
                    $remote = new ilCalendarRemoteReader($category->getRemoteUrl());
                    $remote->setUser($category->getRemoteUser());
                    $remote->setPass($category->getRemotePass());
                    $remote->read();
                    $remote->import($category);
                    break;
                }
            }
        }
    }

    #21613
    public function showToolbarAndSidebar()
    {
        #21783
        if ($this->ctrl->getCmdClass() == "ilcalendarappointmentgui" || $this->ctrl->getCmdClass() == 'ilconsultationhoursgui') {
            return false;
        }
        return true;
    }
}