class.ilObjForumGUI.php

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<?php
/* Copyright (c) 1998-2012 ILIAS open source, Extended GPL, see docs/LICENSE */

use ILIAS\UI\Factory;
use ILIAS\UI\Renderer;

class ilObjForumGUI extends \ilObjectGUI implements \ilDesktopItemHandling
{
    private $viewModeOptions = [
        ilForumProperties::VIEW_TREE => 'sort_by_posts',
        ilForumProperties::VIEW_DATE_ASC => 'sort_by_date',
    ];

    private $sortationOptions = [
        ilForumProperties::VIEW_DATE_ASC => 'ascending_order',
        ilForumProperties::VIEW_DATE_DESC => 'descending_order',
    ];

    private $globalScreen;

    public $modal_history = '';

    public $objProperties;

    private $objCurrentTopic;

    private $objCurrentPost;

    private $display_confirm_post_activation = 0;

    private $is_moderator = false;

    private $replyEditForm;

    private $hideToolbar = false;

    public $object;

    private $httpRequest;
    private $http;

    private $uiFactory;

    private $uiRenderer;

    private $forumObjects = null;

    private $confirmation_gui_html = '';

    private $forum_settings_gui;

    public $ilNavigationHistory;
    private $requestAction = '';

    private $modalActionsContainer = [];

    public $access;
    public $ilObjDataCache;
    public $tabs;
    public $error;
    public $user;
    public $settings;
    public $toolbar;
    public $repositoryTree;
    public $rbac;
    public $locator;
    public $ilHelp;
    private $selectedSorting;

    public function __construct($a_data, $a_id, $a_call_by_reference = true, $a_prepare_output = true)
    {
        global $DIC;

        $this->ctrl = $DIC->ctrl();
        $this->ctrl->saveParameter($this, ['ref_id', 'cmdClass']);

        $this->tpl = $DIC->ui()->mainTemplate();
        $this->lng = $DIC->language();
        $this->httpRequest = $DIC->http()->request();
        $this->http = $DIC->http();
        $this->uiFactory = $DIC->ui()->factory();
        $this->uiRenderer = $DIC->ui()->renderer();
        $this->globalScreen = $DIC->globalScreen();

        $this->access = $DIC->access();
        $this->ilObjDataCache = $DIC['ilObjDataCache'];
        $this->tabs = $DIC->tabs();
        $this->error = $DIC['ilErr'];
        $this->ilNavigationHistory = $DIC['ilNavigationHistory'];
        $this->user = $DIC->user();
        $this->settings = $DIC->settings();
        $this->toolbar = $DIC->toolbar();
        $this->repositoryTree = $DIC->repositoryTree();
        $this->ilHelp = $DIC['ilHelp'];
        $this->rbac = $DIC->rbac();
        $this->locator = $DIC['ilLocator'];

        $this->tpl->addJavaScript('./Services/JavaScript/js/Basic.js');

        $this->type = 'frm';
        parent::__construct($a_data, $a_id, $a_call_by_reference, false);

        $this->lng->loadLanguageModule('forum');

        $this->initSessionStorage();

        $this->objProperties = \ilForumProperties::getInstance($this->ilObjDataCache->lookupObjId($_GET['ref_id']));
        $this->is_moderator = $this->access->checkAccess('moderate_frm', '', $_GET['ref_id']);

        $this->objCurrentTopic = new ilForumTopic((int) $this->httpRequest->getQueryParams()['thr_pk'] ?? 0, $this->is_moderator);
        $this->objCurrentPost = new ilForumPost((int) $this->httpRequest->getQueryParams()['pos_pk'] ?? 0, $this->is_moderator);

        $this->requestAction = (string) ($this->httpRequest->getQueryParams()['action'] ?? '');
        $this->checkUsersViewMode();
    }

    protected function initSessionStorage()
    {
        $forumValues = \ilSession::get('frm');
        if (!is_array($forumValues)) {
            $forumValues = [];
            \ilSession::set('frm', $forumValues);
        }

        $threadId = $this->httpRequest->getQueryParams()['thr_pk'] ?? 0;
        if ((int) $threadId > 0 && !is_array($forumValues[(int) $threadId])) {
            $forumValues[(int) $threadId] = [];
            \ilSession::set('frm', $forumValues);
        }
    }

    protected function toggleExplorerNodeStateObject() : void
    {
        $exp = new ilForumExplorerGUI(
            'frm_exp_' . $this->objCurrentTopic->getId(),
            $this,
            'viewThread',
            $this->objCurrentTopic,
            $this->objCurrentTopic->getFirstPostNode($this->is_moderator)
        );
        $exp->toggleExplorerNodeState();
    }


    protected function ensureValidPageForCurrentPosting(
        array $subtree_nodes,
        array $pagedPostings,
        int $pageSize,
        ilForumPost $firstForumPost
    ) {
        if ($firstForumPost->getId() == $this->objCurrentPost->getId()) {
            return;
        }

        if (count($subtree_nodes) > 0 && $this->objCurrentPost->getId() > 0) {
            $isCurrentPostingInPage = array_filter($pagedPostings, function (ilForumPost $posting) {
                return $posting->getId() == $this->objCurrentPost->getId();
            });

            if (0 === count($isCurrentPostingInPage)) {
                $pageOfCurrentPosting = 0;
                $i = 0;
                foreach ($subtree_nodes as $node) {
                    if ($i > 0 && 0 === $i % $pageSize) {
                        ++$pageOfCurrentPosting;
                    }

                    if ($node->getId() == $this->objCurrentPost->getId()) {
                        break;
                    }

                    ++$i;
                }

                $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentTopic->getId());
                $this->ctrl->setParameter($this, 'pos_pk', $this->objCurrentPost->getId());
                $this->ctrl->setParameter($this, 'page', $pageOfCurrentPosting);
                $this->ctrl->setParameter(
                    $this,
                    'orderby',
                    ilUtil::stripSlashes($this->httpRequest->getQueryParams()['orderby'])
                );
                $this->ctrl->redirect($this, 'viewThread', $this->objCurrentPost->getId());
            }
        }
    }

    public function ensureThreadBelongsToForum(int $objId, \ilForumTopic $thread)
    {
        $forumId = \ilObjForum::lookupForumIdByObjId($objId);
        if ((int) $thread->getForumId() !== (int) $forumId) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }
    }

    private function decorateWithAutosave(\ilPropertyFormGUI $form)
    {
        if (\ilForumPostDraft::isAutoSavePostDraftAllowed()) {
            $interval = ilForumPostDraft::lookupAutosaveInterval();

            $this->tpl->addJavascript('./Modules/Forum/js/autosave.js');
            $autosave_cmd = 'autosaveDraftAsync';
            if ($this->objCurrentPost->getId() == 0 && $this->objCurrentPost->getThreadId() == 0) {
                $autosave_cmd = 'autosaveThreadDraftAsync';
            }
            $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentPost->getThreadId());
            $this->ctrl->setParameter($this, 'pos_pk', $this->objCurrentPost->getId());
            $draft_id = (int) $_GET['draft_id'] > 0 ? (int) $_GET['draft_id'] : 0;
            $this->ctrl->setParameter($this, 'draft_id', $draft_id);
            $this->ctrl->setParameter($this, 'action', \ilUtil::stripSlashes($this->requestAction));
            $this->tpl->addOnLoadCode(
                "il.Language.setLangVar('saving', " . json_encode($this->lng->txt('saving')) . ");"
            );

            $this->tpl->addOnLoadCode('il.ForumDraftsAutosave.init(' . json_encode(array(
                    'loading_img_src' => \ilUtil::getImagePath('loader.svg'),
                    'draft_id' => $draft_id,
                    'interval' => $interval * 1000,
                    'url' => $this->ctrl->getFormAction($this, $autosave_cmd, '', true, false),
                    'selectors' => array(
                        'form' => '#form_' . $form->getId()
                    )
                )) . ');');
        }
    }

    private function isTopLevelReplyCommand() : bool
    {
        return in_array(
            strtolower($this->ctrl->getCmd()),
            array_map('strtolower', array('createTopLevelPost', 'saveTopLevelPost', 'saveTopLevelDraft'))
        );
    }

    public function executeCommand()
    {
        $next_class = $this->ctrl->getNextClass($this);
        $cmd = $this->ctrl->getCmd();

        $exclude_cmds = array(
            'viewThread',
            'markPostUnread',
            'markPostRead',
            'showThreadNotification',
            'performPostActivation',
            'askForPostActivation',
            'askForPostDeactivation',
            'toggleThreadNotification',
            'toggleThreadNotificationTab',
            'toggleStickiness',
            'cancelPost',
            'savePost',
            'saveTopLevelPost',
            'createTopLevelPost',
            'saveTopLevelDraft',
            'quotePost',
            'getQuotationHTMLAsynch',
            'autosaveDraftAsync',
            'autosaveThreadDraftAsync',
            'saveAsDraft',
            'editDraft',
            'updateDraft',
            'deliverDraftZipFile',
            'deliverZipFile',
            'cancelDraft',
            'deleteThreadDrafts',
            'deletePosting',
            'deletePostingDraft',
            'revokeCensorship',
            'addCensorship',
        );

        if (!in_array($cmd, $exclude_cmds)) {
            $this->prepareOutput();
        }

        if (!$this->getCreationMode() && !$this->ctrl->isAsynch() && $this->access->checkAccess(
            'read',
            '',
            $_GET['ref_id']
        )) {
            $this->ilNavigationHistory->addItem(
                (int) $_GET['ref_id'],
                \ilLink::_getLink((int) $_GET['ref_id'], 'frm'),
                'frm'
            );
        }

        switch ($next_class) {
            case 'ilforumsettingsgui':
                $forum_settings_gui = new ilForumSettingsGUI($this);
                $this->ctrl->forwardCommand($forum_settings_gui);
                break;

            case 'ilrepositoryobjectsearchgui':
                $this->addHeaderAction();
                $this->setSideBlocks();
                $this->tabs->activateTab("forums_threads");
                $this->ctrl->setReturn($this, 'view');
                $search_gui = new ilRepositoryObjectSearchGUI(
                    $this->object->getRefId(),
                    $this,
                    'view'
                );
                $this->ctrl->forwardCommand($search_gui);
                break;

            case 'ilpermissiongui':
                $perm_gui = new ilPermissionGUI($this);
                $this->ctrl->forwardCommand($perm_gui);
                break;

            case 'ilforumexportgui':
                $fex_gui = new ilForumExportGUI();
                $this->ctrl->forwardCommand($fex_gui);
                $this->http->close();
                break;

            case 'ilforummoderatorsgui':
                $fm_gui = new ilForumModeratorsGUI();
                $this->ctrl->forwardCommand($fm_gui);
                break;

            case 'ilinfoscreengui':
                $this->infoScreen();
                break;

            case 'ilcolumngui':
                $this->showThreadsObject();
                break;

            case 'ilpublicuserprofilegui':
                $profile_gui = new ilPublicUserProfileGUI((int) $_GET['user']);
                $add = $this->getUserProfileAdditional((int) $_GET['ref_id'], (int) $_GET['user']);
                $profile_gui->setAdditional($add);
                $ret = $this->ctrl->forwardCommand($profile_gui);
                $this->tpl->setContent($ret);
                break;

            case 'ilobjectcopygui':
                $cp = new ilObjectCopyGUI($this);
                $cp->setType('frm');
                $this->ctrl->forwardCommand($cp);
                break;

            case 'ilexportgui':
                $this->tabs->activateTab('export');
                $exp = new ilExportGUI($this);
                $exp->addFormat('xml');
                $this->ctrl->forwardCommand($exp);
                break;

            case "ilratinggui":
                if (!$this->objProperties->isIsThreadRatingEnabled() || $this->user->isAnonymous()) {
                    $this->error->raiseError($this->lng->txt('msg_no_perm_read'), $this->error->MESSAGE);
                }

                if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
                    $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
                }

                $this->ensureThreadBelongsToForum((int) $this->object->getId(), $this->objCurrentTopic);

                $rating_gui = new ilRatingGUI();
                $rating_gui->setObject(
                    $this->object->getId(),
                    $this->object->getType(),
                    $this->objCurrentTopic->getId(),
                    'thread'
                );

                $this->ctrl->setParameter($this, 'thr_pk', (int) $this->objCurrentTopic->getId());
                $this->ctrl->forwardCommand($rating_gui);

                $avg = ilRating::getOverallRatingForObject(
                    $this->object->getId(),
                    $this->object->getType(),
                    (int) $this->objCurrentTopic->getId(),
                    'thread'
                );
                $this->objCurrentTopic->setAverageRating($avg['avg']);
                $this->objCurrentTopic->update();

                $this->ctrl->redirect($this, "showThreads");
                break;

            case 'ilcommonactiondispatchergui':
                $gui = ilCommonActionDispatcherGUI::getInstanceFromAjaxCall();
                $this->ctrl->forwardCommand($gui);
                break;

            case "ilcontainernewssettingsgui":
                $forum_settings_gui = new ilForumSettingsGUI($this);
                $forum_settings_gui->settingsTabs();

                $this->lng->loadLanguageModule('cont');
                $news_set_gui = new ilContainerNewsSettingsGUI($this);
                $news_set_gui->setNewsBlockForced(true);
                $news_set_gui->setPublicNotification(true);
                $this->ctrl->forwardCommand($news_set_gui);
                break;

            default:
                // alex, 11 Jan 2011:
                // I inserted this workaround due to bug report 6971.
                // In general the command handling is quite obscure here.
                // The form action of the table should be filled
                // with $ilCtrl->getFormAction(..) not with $ilCtrl->getLinkTarget(..)
                // Commands should be determined with $ilCtrl->getCmd() not
                // with accessing $_POST['selected_cmd'], since this is internal
                // of ilTable2GUI/ilCtrl and may change.
                if (isset($_POST['select_cmd2'])) {
                    $_POST['selected_cmd'] = $_POST["selected_cmd2"];
                }

                if (isset($_POST['selected_cmd']) && $_POST['selected_cmd'] != null) {
                    $member_cmd = array(
                        'enableAdminForceNoti',
                        'disableAdminForceNoti',
                        'enableHideUserToggleNoti',
                        'disableHideUserToggleNoti'
                    );
                    in_array(
                        $_POST['selected_cmd'],
                        $member_cmd
                    ) ? $cmd = $_POST['selected_cmd'] : $cmd = 'performThreadsAction';
                } elseif (!$cmd && !$_POST['selected_cmd']) {
                    $cmd = 'showThreads';
                }

                $cmd .= 'Object';
                $this->$cmd();

                break;
        }

        // suppress for topic level
        if ($cmd != 'viewThreadObject' && $cmd != 'showUserObject') {
            $this->addHeaderAction();
        }
    }

    public function infoScreenObject()
    {
        $this->ctrl->setCmd('showSummary');
        $this->ctrl->setCmdClass('ilinfoscreengui');
        $this->infoScreen();
    }

    protected function initEditCustomForm(ilPropertyFormGUI $a_form)
    {
        $this->forum_settings_gui = new ilForumSettingsGUI($this);
        $this->forum_settings_gui->getCustomForm($a_form);
    }

    protected function getEditFormCustomValues(array &$a_values)
    {
        $this->forum_settings_gui->getCustomValues($a_values);
    }

    protected function updateCustom(ilPropertyFormGUI $a_form)
    {
        $this->forum_settings_gui->updateCustomValues($a_form);
    }

    private function getThreadEditingForm($a_thread_id)
    {
        $form = new ilPropertyFormGUI();
        $this->ctrl->setParameter($this, 'thr_pk', $a_thread_id);
        $form->setFormAction($this->ctrl->getFormAction($this, 'updateThread'));

        $ti_prop = new ilTextInputGUI($this->lng->txt('title'), 'title');
        $ti_prop->setRequired(true);
        $ti_prop->setMaxLength(255);
        $ti_prop->setSize(50);
        $form->addItem($ti_prop);

        $form->addCommandButton('updateThread', $this->lng->txt('save'));
        $form->addCommandButton('showThreads', $this->lng->txt('cancel'));

        return $form;
    }

    public function editThreadObject($threadId, ilPropertyFormGUI $form = null)
    {
        if (!$this->is_moderator) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $thread = new \ilForumTopic($threadId);
        $this->ensureThreadBelongsToForum((int) $this->object->getId(), $thread);

        $this->tabs->activateTab('forums_threads');

        if (!($form instanceof \ilPropertyFormGUI)) {
            $form = $this->getThreadEditingForm($threadId);
            $form->setValuesByArray(array(
                'title' => $thread->getSubject()
            ));
        }

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

    public function updateThreadObject()
    {
        if (!$this->is_moderator) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        if (!$this->objCurrentTopic->getId()) {
            $this->showThreadsObject();
            return;
        }

        $this->ensureThreadBelongsToForum((int) $this->object->getId(), $this->objCurrentTopic);

        $form = $this->getThreadEditingForm($this->objCurrentTopic->getId());
        if (!$form->checkInput()) {
            $form->setValuesByPost();
            $this->editThreadObject($this->objCurrentTopic->getId(), $form);
            return;
        }

        $this->objCurrentTopic->setSubject($form->getInput('title'));
        $this->objCurrentTopic->updateThreadTitle();

        ilUtil::sendSuccess($this->lng->txt('saved_successfully'));
        $this->showThreadsObject();
    }

    public function markAllReadObject()
    {
        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $this->object->markAllThreadsRead($this->user->getId());
        ilUtil::sendInfo($this->lng->txt('forums_all_threads_marked_read'));
        $this->showThreadsObject();
    }

    public function showThreadsObject()
    {
        $this->getSubTabs('showThreads');
        $this->setSideBlocks();
        $this->getCenterColumnHTML();
    }

    public function sortThreadsObject()
    {
        $this->getSubTabs('sortThreads');
        $this->setSideBlocks();
        $this->getCenterColumnHTML();
    }

    public function getSubTabs($subtab = 'showThreads')
    {
        if ($this->objProperties->getThreadSorting() == 1 && $this->is_moderator) {
            $this->tabs->addSubTabTarget(
                'show',
                $this->ctrl->getLinkTarget($this, 'showThreads'),
                'showThreads',
                get_class($this),
                '',
                $subtab == 'showThreads' ? true : false
            );
    
            if ($this->object->getNumStickyThreads() > 1) {
                $this->tabs->addSubTabTarget(
                    'sticky_threads_sorting',
                    $this->ctrl->getLinkTarget($this, 'sortThreads'),
                    'sortThreads',
                    '',
                    $subtab == 'sortThreads' ? true : false
                );
            }
        }
    }

    public function getContent()
    {
        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $cmd = $this->ctrl->getCmd();
        $frm = $this->object->Forum;
        $frm->setForumId($this->object->getId());
        $frm->setForumRefId($this->object->getRefId());
        $frm->setMDB2Wherecondition('top_frm_fk = %s ', array('integer'), array($frm->getForumId()));

        $threadsTemplate = new \ilTemplate(
            'tpl.forums_threads_liste.html',
            true,
            true,
            'Modules/Forum'
        );

        if ((int) strlen($this->confirmation_gui_html)) {
            $threadsTemplate->setVariable('CONFIRMATION_GUI', $this->confirmation_gui_html);
        }

        // Create topic button
        if ($this->access->checkAccess('add_thread', '', $this->object->getRefId()) && !$this->hideToolbar()) {
            $btn = ilLinkButton::getInstance();
            $btn->setUrl($this->ctrl->getLinkTarget($this, 'createThread'));
            $btn->setCaption('forums_new_thread');
            $this->toolbar->addStickyItem($btn);
        }

        // Mark all topics as read button
        if (!$this->user->isAnonymous() && !(int) strlen($this->confirmation_gui_html)) {
            $this->toolbar->addButton(
                $this->lng->txt('forums_mark_read'),
                $this->ctrl->getLinkTarget($this, 'markAllRead'),
                '',
                ilAccessKey::MARK_ALL_READ
            );
            $this->ctrl->clearParameters($this);
        }

        if (\ilForumPostDraft::isSavePostDraftAllowed()) {
            $drafts = \ilForumPostDraft::getThreadDraftData(
                $this->user->getId(),
                ilObjForum::lookupForumIdByObjId($this->object->getId())
            );
            if (count($drafts) > 0) {
                $draftsTable = new ilForumDraftsTableGUI(
                    $this,
                    $cmd,
                    $this->access->checkAccess('add_thread', '', $this->object->getRefId())
                );
                $draftsTable->setData($drafts);
                $threadsTemplate->setVariable('THREADS_DRAFTS_TABLE', $draftsTable->getHTML());
            }
        }

        // Import information: Topic (variable $topicData) means frm object, not thread
        $topicData = $frm->getOneTopic();
        if ($topicData) {
            // Visit-Counter
            $frm->setDbTable('frm_data');
            $frm->setMDB2WhereCondition('top_pk = %s ', array('integer'), array($topicData['top_pk']));
            $frm->updateVisits($topicData['top_pk']);

            if (!in_array($cmd, array('showThreads', 'sortThreads'))) {
                $cmd = 'showThreads';
            }

            $tbl = new ilForumTopicTableGUI(
                $this,
                $cmd,
                '',
                (int) $_GET['ref_id'],
                $topicData,
                $this->is_moderator,
                $this->settings->get('forum_overview')
            );
            $tbl->init();
            $tbl->setMapper($frm)->fetchData();
            $threadsTemplate->setVariable('THREADS_TABLE', $tbl->getHTML());
        }

        $this->tpl->setPermanentLink($this->object->getType(), $this->object->getRefId(), '', '_top');

        $this->tpl->setContent($threadsTemplate->get());
    }

    protected function renderDraftContent(
        ilTemplate $tpl,
        string $action,
        ilForumPost $referencePosting,
        array $drafts
    ) : void {
        $frm = $this->object->Forum;

        foreach ($drafts as $draft) {
            $tmp_file_obj = new ilFileDataForumDrafts($this->object->getId(), $draft->getDraftId());
            $filesOfDraft = $tmp_file_obj->getFilesOfPost();
            ksort($filesOfDraft);

            if (count($filesOfDraft)) {
                if ($action !== 'showdraft') {
                    foreach ($filesOfDraft as $file) {
                        $tpl->setCurrentBlock('attachment_download_row');
                        $this->ctrl->setParameter($this, 'draft_id', $tmp_file_obj->getDraftId());
                        $this->ctrl->setParameter($this, 'file', $file['md5']);
                        $tpl->setVariable('HREF_DOWNLOAD', $this->ctrl->getLinkTarget($this, 'viewThread'));
                        $tpl->setVariable('TXT_FILENAME', $file['name']);
                        $this->ctrl->setParameter($this, 'file', '');
                        $this->ctrl->setParameter($this, 'draft_id', '');
                        $this->ctrl->clearParameters($this);
                        $tpl->parseCurrentBlock();
                    }

                    $tpl->setCurrentBlock('attachments');
                    $tpl->setVariable('TXT_ATTACHMENTS_DOWNLOAD', $this->lng->txt('forums_attachments'));
                    $tpl->setVariable(
                        'DOWNLOAD_IMG',
                        ilGlyphGUI::get(ilGlyphGUI::ATTACHMENT, $this->lng->txt('forums_download_attachment'))
                    );
                    if (count($filesOfDraft) > 1) {
                        $download_zip_button = ilLinkButton::getInstance();
                        $download_zip_button->setCaption($this->lng->txt('download'), false);
                        $this->ctrl->setParameter($this, 'draft_id', $draft->getDraftId());
                        $download_zip_button->setUrl($this->ctrl->getLinkTarget($this, 'deliverDraftZipFile'));
                        $this->ctrl->setParameter($this, 'draft_id', '');
                        $tpl->setVariable('DOWNLOAD_ZIP', $download_zip_button->render());
                    }
                    $tpl->parseCurrentBlock();
                }
            }

            $this->renderSplitButton(
                $tpl,
                $action,
                false,
                $referencePosting,
                (int) $this->httpRequest->getQueryParams()['page'],
                $draft
            );

            $rowCol = 'tblrowmarked';
            $tpl->setVariable('ROWCOL', ' ' . $rowCol);
            $depth = (int) ($referencePosting->getDepth() - 1);
            if ($this->selectedSorting === ilForumProperties::VIEW_TREE) {
                $depth += 1;
            }
            $tpl->setVariable('DEPTH', $depth);

            $this->ctrl->setParameter($this, 'pos_pk', $referencePosting->getId());
            $this->ctrl->setParameter($this, 'thr_pk', $referencePosting->getThreadId());
            $this->ctrl->setParameter($this, 'draft_id', $draft->getDraftId());

            $backurl = urlencode($this->ctrl->getLinkTarget($this, 'viewThread', $referencePosting->getId()));

            $this->ctrl->setParameter($this, 'backurl', $backurl);
            $this->ctrl->setParameter($this, 'thr_pk', $referencePosting->getThreadId());
            $this->ctrl->setParameter($this, 'user', $draft->getPostDisplayUserId());

            $authorinfo = new ilForumAuthorInformation(
                $draft->getPostAuthorId(),
                $draft->getPostDisplayUserId(),
                $draft->getPostUserAlias(),
                '',
                array(
                    'href' => $this->ctrl->getLinkTarget($this, 'showUser')
                )
            );

            $this->ctrl->clearParameters($this);

            if ($authorinfo->hasSuffix()) {
                $tpl->setVariable('AUTHOR', $authorinfo->getSuffix());
                $tpl->setVariable('USR_NAME', $draft->getPostUserAlias());
            } else {
                $tpl->setVariable('AUTHOR', $authorinfo->getLinkedAuthorShortName());
                if ($authorinfo->getAuthorName(true) && !$this->objProperties->isAnonymized()) {
                    $tpl->setVariable('USR_NAME', $authorinfo->getAuthorName(true));
                }
            }
            $tpl->setVariable('DRAFT_ANCHOR', 'draft_' . $draft->getDraftId());

            $tpl->setVariable('USR_IMAGE', $authorinfo->getProfilePicture());
            $tpl->setVariable('USR_ICON_ALT', ilUtil::prepareFormOutput($authorinfo->getAuthorShortName()));
            if ($authorinfo->getAuthor()->getId() && ilForum::_isModerator(
                $this->ref_id,
                $draft->getPostAuthorId()
            )) {
                if ($authorinfo->getAuthor()->getGender() == 'f') {
                    $tpl->setVariable('ROLE', $this->lng->txt('frm_moderator_f'));
                } elseif ($authorinfo->getAuthor()->getGender() == 'm') {
                    $tpl->setVariable('ROLE', $this->lng->txt('frm_moderator_m'));
                } elseif ($authorinfo->getAuthor()->getGender() == 'n') {
                    $tpl->setVariable('ROLE', $this->lng->txt('frm_moderator_n'));
                }
            }

            if ($draft->getUpdateUserId() > 0) {
                $draft->setPostUpdate($draft->getPostUpdate());

                $this->ctrl->setParameter($this, 'backurl', $backurl);
                $this->ctrl->setParameter($this, 'thr_pk', $referencePosting->getThreadId());
                $this->ctrl->setParameter($this, 'user', $referencePosting->getUpdateUserId());
                $this->ctrl->setParameter($this, 'draft_id', $draft->getDraftId());

                $authorinfo = new ilForumAuthorInformation(
                    $draft->getPostAuthorId(),
                    // We assume the editor is the author here
                    $draft->getPostDisplayUserId(),
                    $draft->getPostUserAlias(),
                    '',
                    array(
                        'href' => $this->ctrl->getLinkTarget($this, 'showUser')
                    )
                );

                $this->ctrl->clearParameters($this);

                $tpl->setVariable(
                    'POST_UPDATE_TXT',
                    $this->lng->txt('edited_on') . ': ' . $frm->convertDate($draft->getPostUpdate()) . ' - ' . strtolower($this->lng->txt('by'))
                );
                $tpl->setVariable('UPDATE_AUTHOR', $authorinfo->getLinkedAuthorShortName());
                if ($authorinfo->getAuthorName(true) && !$this->objProperties->isAnonymized() && !$authorinfo->hasSuffix()) {
                    $tpl->setVariable('UPDATE_USR_NAME', $authorinfo->getAuthorName(true));
                }
            }

            $draft->setPostMessage($frm->prepareText($draft->getPostMessage()));

            $tpl->setVariable('SUBJECT', $draft->getPostSubject());
            $tpl->setVariable('POST_DATE', $frm->convertDate($draft->getPostDate()));

            if (!$referencePosting->isCensored() || ($this->objCurrentPost->getId() == $referencePosting->getId() && $action === 'censor')) {
                $spanClass = '';
                if (ilForum::_isModerator($this->ref_id, $draft->getPostDisplayUserId())) {
                    $spanClass = 'moderator';
                }

                if ($draft->getPostMessage() == strip_tags($draft->getPostMessage())) {
                    // We can be sure, that there are not html tags
                    $draft->setPostMessage(nl2br($draft->getPostMessage()));
                }

                if ($spanClass != "") {
                    $tpl->setVariable(
                        'POST',
                        "<span class=\"" . $spanClass . "\">" . ilRTE::_replaceMediaObjectImageSrc(
                            $draft->getPostMessage(),
                            1
                        ) . "</span>"
                    );
                } else {
                    $tpl->setVariable('POST', ilRTE::_replaceMediaObjectImageSrc($draft->getPostMessage(), 1));
                }
            }

            if (!$this->objCurrentTopic->isClosed() && $action === 'deletedraft') {
                if (!$this->user->isAnonymous() && (int) $draft->getDraftId() === (int) $_GET['draft_id']) {
                    // confirmation: delete
                    $tpl->setVariable('FORM', $this->getDeleteDraftFormHTML());
                }
            } elseif ($action === 'editdraft' && (int) $draft->getDraftId() === (int) $_GET['draft_id']) {
                $oEditReplyForm = $this->getReplyEditForm();

                if (!$this->objCurrentTopic->isClosed() && in_array($this->requestAction, ['showdraft', 'editdraft'])) {
                    $this->renderPostingForm($tpl, $frm, $referencePosting, $this->requestAction);
                }

                $tpl->setVariable('EDIT_DRAFT_ANCHOR', 'draft_edit_' . $draft->getDraftId());
                $tpl->setVariable('DRAFT_FORM', $oEditReplyForm->getHTML() . $this->modal_history);
            }

            $tpl->parseCurrentBlock();
        }
    }

    protected function renderPostContent(
        ilTemplate $tpl,
        ilForumPost $node,
        string $action,
        int $pageIndex,
        int $postIndex
    ) {
        $forumObj = $this->object;
        $frm = $this->object->Forum;

        $fileDataOfForum = new ilFileDataForum($forumObj->getId(), $node->getId());

        $filesOfPost = $fileDataOfForum->getFilesOfPost();
        ksort($filesOfPost);
        if (count($filesOfPost) > 0) {
            if ($node->getId() != $this->objCurrentPost->getId() || $action !== 'showedit') {
                foreach ($filesOfPost as $file) {
                    $tpl->setCurrentBlock('attachment_download_row');
                    $this->ctrl->setParameter($this, 'pos_pk', $node->getId());
                    $this->ctrl->setParameter($this, 'file', $file['md5']);
                    $tpl->setVariable('HREF_DOWNLOAD', $this->ctrl->getLinkTarget($this, 'viewThread'));
                    $tpl->setVariable('TXT_FILENAME', $file['name']);
                    $this->ctrl->clearParameters($this);
                    $tpl->parseCurrentBlock();
                }

                $tpl->setCurrentBlock('attachments');
                $tpl->setVariable('TXT_ATTACHMENTS_DOWNLOAD', $this->lng->txt('forums_attachments'));
                $tpl->setVariable(
                    'DOWNLOAD_IMG',
                    ilGlyphGUI::get(ilGlyphGUI::ATTACHMENT, $this->lng->txt('forums_download_attachment'))
                );
                if (count($filesOfPost) > 1) {
                    $download_zip_button = ilLinkButton::getInstance();
                    $download_zip_button->setCaption($this->lng->txt('download'), false);
                    $this->ctrl->setParameter($this, 'pos_pk', $node->getId());
                    $download_zip_button->setUrl($this->ctrl->getLinkTarget($this, 'deliverZipFile'));

                    $tpl->setVariable('DOWNLOAD_ZIP', $download_zip_button->render());
                }

                $tpl->parseCurrentBlock();
            }
        }
        $this->renderSplitButton($tpl, $action, true, $node, $pageIndex);

        $tpl->setVariable('POST_ANKER', $node->getId());
        $tpl->setVariable('TXT_PERMA_LINK', $this->lng->txt('perma_link'));
        $tpl->setVariable('PERMA_TARGET', '_top');

        $rowCol = ilUtil::switchColor($postIndex, 'tblrow1', 'tblrow2');
        if (!$node->isActivated() && !$this->objCurrentTopic->isClosed() && $this->is_moderator) {
            $rowCol = 'ilPostingNeedsActivation';
        } elseif ($this->objProperties->getMarkModeratorPosts() == 1) {
            $isAuthorModerator = ilForum::_isModerator($this->ref_id, $node->getPosAuthorId());
            if ($node->getIsAuthorModerator() === null && $isAuthorModerator) {
                $rowCol = 'ilModeratorPosting';
            } elseif ($node->getIsAuthorModerator()) {
                $rowCol = 'ilModeratorPosting';
            }
        }

        if (
            (!in_array($action, ['delete', 'censor']) && !$this->displayConfirmPostActivation()) ||
            $this->objCurrentPost->getId() != $node->getId()
        ) {
            $tpl->setVariable('ROWCOL', ' ' . $rowCol);
        } else {
            $rowCol = 'tblrowmarked';
        }

        if ($node->isCensored()) {
            if ($action !== 'censor') {
                $tpl->setVariable('TXT_CENSORSHIP_ADVICE', $this->lng->txt('post_censored_comment_by_moderator'));
            }

            $rowCol = 'tblrowmarked';
        }

        $tpl->setVariable('ROWCOL', ' ' . $rowCol);
        $tpl->setVariable('DEPTH', (int) ($node->getDepth() - 1));
        if (!$node->isActivated() && $node->isOwner($this->user->getId())) {
            $tpl->setVariable('POST_NOT_ACTIVATED_YET', $this->lng->txt('frm_post_not_activated_yet'));
        }

        $this->ctrl->setParameter($this, 'pos_pk', $node->getId());
        $this->ctrl->setParameter($this, 'thr_pk', $node->getThreadId());
        $backurl = urlencode($this->ctrl->getLinkTarget($this, 'viewThread', $node->getId()));
        $this->ctrl->clearParameters($this);

        $this->ctrl->setParameter($this, 'backurl', $backurl);
        $this->ctrl->setParameter($this, 'thr_pk', $node->getThreadId());
        $this->ctrl->setParameter($this, 'user', $node->getDisplayUserId());
        $authorinfo = new ilForumAuthorInformation(
            $node->getPosAuthorId(),
            $node->getDisplayUserId(),
            $node->getUserAlias(),
            $node->getImportName(),
            [
                'href' => $this->ctrl->getLinkTarget($this, 'showUser')
            ]
        );
        $this->ctrl->clearParameters($this);

        if ($authorinfo->hasSuffix()) {
            if (!$authorinfo->isDeleted()) {
                $tpl->setVariable('USR_NAME', $authorinfo->getAlias());
            }
            $tpl->setVariable('AUTHOR', $authorinfo->getSuffix());
        } else {
            if ($authorinfo->getAuthorName(true) && !$this->objProperties->isAnonymized()) {
                $tpl->setVariable('USR_NAME', $authorinfo->getAuthorName(true));
            }
            $tpl->setVariable('AUTHOR', $authorinfo->getLinkedAuthorShortName());
        }

        $tpl->setVariable('USR_IMAGE', $authorinfo->getProfilePicture());
        $tpl->setVariable('USR_ICON_ALT', ilUtil::prepareFormOutput($authorinfo->getAuthorShortName()));
        $isModerator = ilForum::_isModerator($this->ref_id, $node->getPosAuthorId());
        if ($authorinfo->getAuthor()->getId() && $isModerator) {
            $authorRole = $this->lng->txt('frm_moderator_n');
            if (is_string($authorinfo->getAuthor()->getGender()) && strlen($authorinfo->getAuthor()->getGender()) > 0) {
                $authorRole = $this->lng->txt('frm_moderator_' . $authorinfo->getAuthor()->getGender());
            }
            $tpl->setVariable('ROLE', $authorRole);
        }

        if ($node->getUpdateUserId() > 0) {
            $node->setChangeDate($node->getChangeDate());

            $this->ctrl->setParameter($this, 'backurl', $backurl);
            $this->ctrl->setParameter($this, 'thr_pk', $node->getThreadId());
            $this->ctrl->setParameter($this, 'user', $node->getUpdateUserId());
            $update_user_id = $node->getUpdateUserId();
            if ($node->getPosAuthorId() == $node->getUpdateUserId() && $node->getDisplayUserId() == 0) {
                $update_user_id = $node->getDisplayUserId();
            }
            $authorinfo = new ilForumAuthorInformation(
                $node->getPosAuthorId(),
                $update_user_id,
                $node->getUserAlias(),
                $node->getImportName(),
                array(
                    'href' => $this->ctrl->getLinkTarget($this, 'showUser')
                )
            );
            $this->ctrl->clearParameters($this);

            $tpl->setVariable(
                'POST_UPDATE_TXT',
                $this->lng->txt('edited_on') . ': ' . $frm->convertDate($node->getChangeDate()) . ' - ' . strtolower($this->lng->txt('by'))
            );
            $tpl->setVariable('UPDATE_AUTHOR', $authorinfo->getLinkedAuthorShortName());
            if ($authorinfo->getAuthorName(true) && !$this->objProperties->isAnonymized() && !$authorinfo->hasSuffix()) {
                $tpl->setVariable('UPDATE_USR_NAME', $authorinfo->getAuthorName(true));
            }
        }

        $node->setMessage($frm->prepareText($node->getMessage()));

        if ($this->user->isAnonymous() || $node->isPostRead()) {
            $tpl->setVariable('SUBJECT', $node->getSubject());
        } else {
            $this->ctrl->setParameter($this, 'pos_pk', $node->getId());
            $this->ctrl->setParameter($this, 'thr_pk', $node->getThreadId());
            $this->ctrl->setParameter($this, 'page', $pageIndex);
            $this->ctrl->setParameter(
                $this,
                'orderby',
                ilUtil::stripSlashes($this->httpRequest->getQueryParams()['orderby'])
            );
            $this->ctrl->setParameter($this, 'viewmode', $this->selectedSorting);
            $mark_post_target = $this->ctrl->getLinkTarget($this, 'markPostRead', $node->getId());

            $tpl->setVariable(
                'SUBJECT',
                "<a href=\"" . $mark_post_target . "\"><b>" . $node->getSubject() . "</b></a>"
            );
        }

        $tpl->setVariable('POST_DATE', $frm->convertDate($node->getCreateDate()));

        if (!$node->isCensored() || ($this->objCurrentPost->getId() == $node->getId() && $action === 'censor')) {
            $spanClass = "";
            if (ilForum::_isModerator($this->ref_id, $node->getDisplayUserId())) {
                $spanClass = 'moderator';
            }

            // possible bugfix for mantis #8223
            if ($node->getMessage() == strip_tags($node->getMessage())) {
                // We can be sure, that there are not html tags
                $node->setMessage(nl2br($node->getMessage()));
            }

            if ($spanClass !== '') {
                $tpl->setVariable(
                    'POST',
                    "<span class=\"" . $spanClass . "\">" .
                    ilRTE::_replaceMediaObjectImageSrc($node->getMessage(), 1) .
                    "</span>"
                );
            } else {
                $tpl->setVariable('POST', ilRTE::_replaceMediaObjectImageSrc($node->getMessage(), 1));
            }
        } else {
            $tpl->setVariable('POST', "<span class=\"moderator\">" . nl2br($node->getCensorshipComment()) . "</span>");
        }

        $tpl->parseCurrentBlock();
    }

    protected function afterSave(ilObject $a_new_object)
    {
        \ilUtil::sendSuccess($this->lng->txt('frm_added'), true);
        $this->ctrl->setParameter($this, 'ref_id', $a_new_object->getRefId());
        $this->ctrl->redirect($this, 'createThread');
    }

    protected function getTabs()
    {
        $this->ilHelp->setScreenIdComponent("frm");

        $this->ctrl->setParameter($this, 'ref_id', $this->ref_id);

        $active = array(
            '',
            'showThreads',
            'view',
            'markAllRead',
            'enableForumNotification',
            'disableForumNotification',
            'moveThreads',
            'performMoveThreads',
            'cancelMoveThreads',
            'performThreadsAction',
            'createThread',
            'addThread',
            'showUser',
            'confirmDeleteThreads',
            'merge',
            'mergeThreads',
            'performMergeThreads'
        );

        (in_array($this->ctrl->getCmd(), $active)) ? $force_active = true : $force_active = false;

        if ($this->access->checkAccess(
            'read',
            '',
            $this->ref_id
        )) {
            $this->tabs->addTarget(
                'forums_threads',
                $this->ctrl->getLinkTarget($this, 'showThreads'),
                $this->ctrl->getCmd(),
                get_class($this),
                '',
                $force_active
            );
        }

        // info tab
        if ($this->access->checkAccess('visible', '', $this->ref_id) || $this->access->checkAccess(
            'read',
            '',
            $this->ref_id
        )) {
            $force_active = ($this->ctrl->getNextClass() == 'ilinfoscreengui' || strtolower($_GET['cmdClass']) == 'ilnotegui') ? true : false;
            $this->tabs->addTarget(
                'info_short',
                $this->ctrl->getLinkTargetByClass(array('ilobjforumgui', 'ilinfoscreengui'), 'showSummary'),
                array('showSummary', 'infoScreen'),
                '',
                '',
                $force_active
            );
        }

        if ($this->access->checkAccess('write', '', $this->ref_id)) {
            $force_active = ($this->ctrl->getCmd() == 'edit') ? true : false;
            $this->tabs->addTarget(
                'settings',
                $this->ctrl->getLinkTarget($this, 'edit'),
                'edit',
                get_class($this),
                '',
                $force_active
            );
        }

        if ($this->access->checkAccess('write', '', $this->ref_id)) {
            $this->tabs->addTarget(
                'frm_moderators',
                $this->ctrl->getLinkTargetByClass('ilForumModeratorsGUI', 'showModerators'),
                'showModerators',
                get_class($this)
            );
        }

        if ($this->settings->get('enable_fora_statistics', false)) {
            $hasStatisticsAccess = $this->access->checkAccess('write', '', $this->ref_id);
            if (!$hasStatisticsAccess) {
                $hasStatisticsAccess = (
                    $this->objProperties->isStatisticEnabled() &&
                    $this->access->checkAccess('read', '', $this->ref_id)
                );
            }

            if ($hasStatisticsAccess) {
                $force_active = ($this->ctrl->getCmd() == 'showStatistics') ? true : false;
                $this->tabs->addTarget(
                    'frm_statistics',
                    $this->ctrl->getLinkTarget($this, 'showStatistics'),
                    'showStatistics',
                    get_class($this),
                    '',
                    $force_active
                );
            }
        }

        if ($this->access->checkAccess('write', '', $this->object->getRefId())) {
            $this->tabs->addTarget('export', $this->ctrl->getLinkTargetByClass('ilexportgui', ''), '', 'ilexportgui');
        }

        if ($this->access->checkAccess('edit_permission', '', $this->ref_id)) {
            $this->tabs->addTarget(
                'perm_settings',
                $this->ctrl->getLinkTargetByClass(array(get_class($this), 'ilpermissiongui'), 'perm'),
                array('perm', 'info', 'owner'),
                'ilpermissiongui'
            );
        }
    }

    public function showStatisticsObject()
    {
        if (!$this->settings->get('enable_fora_statistics', false)) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        // if no read access -> intrusion detected
        if (!$this->access->checkAccess('read', '', (int) $_GET['ref_id'])) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        // if read access and statistics disabled -> intrusion detected
        if (!$this->objProperties->isStatisticEnabled()) {
            // if write access and statistics disabled -> ok, for forum admin
            if ($this->access->checkAccess('write', '', (int) $_GET['ref_id'])) {
                ilUtil::sendInfo($this->lng->txt('frm_statistics_disabled_for_participants'));
            } else {
                $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
            }
        }

        $this->object->Forum->setForumId($this->object->getId());

        $tbl = new ilForumStatisticsTableGUI($this, 'showStatistics');
        $tbl->setId('il_frm_statistic_table_' . (int) $_GET['ref_id']);
        $tbl->setTitle(
            $this->lng->txt('statistic'),
            'icon_usr.svg',
            $this->lng->txt('obj_' . $this->object->getType())
        );

        $data = $this->object->Forum->getUserStatistic($this->is_moderator);
        $result = array();
        $counter = 0;
        foreach ($data as $row) {
            $result[$counter]['ranking'] = $row[0];
            $result[$counter]['login'] = $row[1];
            $result[$counter]['lastname'] = $row[2];
            $result[$counter]['firstname'] = $row[3];

            ++$counter;
        }
        $tbl->setData($result);

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

    public static function _goto($a_target, $a_thread = 0, $a_posting = 0)
    {
        global $DIC;

        $ilAccess = $DIC->access();
        $lng = $DIC->language();
        $ilErr = $DIC['ilErr'];

        if ($ilAccess->checkAccess('read', '', $a_target)) {
            if ($a_thread != 0) {
                $objTopic = new ilForumTopic($a_thread);
                if ($objTopic->getFrmObjId() &&
                    $objTopic->getFrmObjId() != ilObject::_lookupObjectId($a_target)) {
                    $ref_ids = ilObject::_getAllReferences($objTopic->getFrmObjId());
                    foreach ($ref_ids as $ref_id) {
                        if ($ilAccess->checkAccess('read', '', $ref_id)) {
                            $new_ref_id = $ref_id;
                            break;
                        }
                    }

                    if (isset($new_ref_id) && $new_ref_id != $a_target) {
                        $DIC->ctrl()->redirectToURL(
                            ILIAS_HTTP_PATH . '/goto.php?target=frm_' . $new_ref_id . '_' . $a_thread . '_' . $a_posting
                        );
                    }
                }

                $DIC->ctrl()->setParameterByClass(ilObjForumGUI::class, 'ref_id', (int) $a_target);
                if (is_numeric($a_thread)) {
                    $DIC->ctrl()->setParameterByClass(ilObjForumGUI::class, 'thr_pk', (int) $a_thread);
                }
                if (is_numeric($a_posting)) {
                    $DIC->ctrl()->setParameterByClass(ilObjForumGUI::class, 'pos_pk', (int) $a_posting);
                }
                $DIC->ctrl()->redirectByClass(
                    [ilRepositoryGUI::class, self::class],
                    'viewThread',
                    is_numeric($a_posting) ? (int) $a_posting : ''
                );
            } else {
                $_GET['ref_id'] = $a_target;
                $_GET['baseClass'] = 'ilRepositoryGUI';
                include_once('ilias.php');
                $DIC->http()->close();
            }
        } elseif ($ilAccess->checkAccess('visible', '', $a_target)) {
            $DIC->ctrl()->setParameterByClass(ilInfoScreenGUI::class, 'ref_id', $a_target);
            $DIC->ctrl()->redirectByClass(
                [
                    ilRepositoryGUI::class,
                    self::class,
                    ilInfoScreenGUI::class
                ],
                'showSummary'
            );
        } elseif ($ilAccess->checkAccess('read', '', ROOT_FOLDER_ID)) {
            $_GET['target'] = '';
            $_GET['ref_id'] = ROOT_FOLDER_ID;
            ilUtil::sendInfo(sprintf(
                $lng->txt('msg_no_perm_read_item'),
                ilObject::_lookupTitle(ilObject::_lookupObjId($a_target))
            ), true);
            $_GET['baseClass'] = 'ilRepositoryGUI';
            include_once('ilias.php');
            $DIC->http()->close();
        }

        $ilErr->raiseError($lng->txt('msg_no_perm_read'), $ilErr->FATAL);
    }

    public function performDeleteThreadsObject()
    {
        if (!$this->is_moderator) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        if (!isset($_POST['thread_ids']) || !is_array($_POST['thread_ids'])) {
            ilUtil::sendInfo($this->lng->txt('select_at_least_one_thread'));
            return $this->showThreadsObject();
        }

        $forumObj = new ilObjForum($this->object->getRefId());
        $this->objProperties->setObjId($forumObj->getId());

        $frm = new ilForum();

        $success_message = "forums_thread_deleted";
        if (count($_POST['thread_ids']) > 1) {
            $success_message = "forums_threads_deleted";
        }

        $threadIds = [];
        if (isset($_POST['thread_ids']) && is_array($_POST['thread_ids'])) {
            $threadIds = $_POST['thread_ids'];
        }

        $threads = [];
        array_walk($threadIds, function ($threadId) use (&$threads) {
            $thread = new \ilForumTopic($threadId);
            $this->ensureThreadBelongsToForum((int) $this->object->getId(), $thread);

            $threads[] = $thread;
        });

        foreach ($threads as $thread) {
            $frm->setForumId($forumObj->getId());
            $frm->setForumRefId($forumObj->getRefId());

            $first_node = $frm->getFirstPostNode($thread->getId());
            if ((int) $first_node['pos_pk']) {
                $frm->deletePost($first_node['pos_pk']);
                ilUtil::sendInfo($this->lng->txt($success_message), true);
            }
        }
        $this->ctrl->redirect($this, 'showThreads');
    }

    public function confirmDeleteThreads()
    {
        if (!isset($_POST['thread_ids']) || !is_array($_POST['thread_ids'])) {
            ilUtil::sendInfo($this->lng->txt('select_at_least_one_thread'));
            return $this->showThreadsObject();
        }

        if (!$this->is_moderator) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $threads = [];
        array_walk($_POST['thread_ids'], function ($threadId) use (&$threads) {
            $thread = new \ilForumTopic($threadId);
            $this->ensureThreadBelongsToForum((int) $this->object->getId(), $thread);

            $threads[] = $thread;
        });

        $c_gui = new ilConfirmationGUI();

        $c_gui->setFormAction($this->ctrl->getFormAction($this, 'performDeleteThreads'));
        $c_gui->setHeaderText($this->lng->txt('frm_sure_delete_threads'));
        $c_gui->setCancel($this->lng->txt('cancel'), 'showThreads');
        $c_gui->setConfirm($this->lng->txt('confirm'), 'performDeleteThreads');

        foreach ($threads as $thread) {
            $c_gui->addItem('thread_ids[]', $thread->getId(), $thread->getSubject());
        }

        $this->confirmation_gui_html = $c_gui->getHTML();

        $this->hideToolbar(true);

        return $this->tpl->setContent($c_gui->getHTML());
    }

    protected function confirmDeleteThreadDraftsObject()
    {
        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $draftIds = array_filter((array) ($this->httpRequest->getParsedBody()['draft_ids'] ?? []));
        if (0 === count($draftIds)) {
            \ilUtil::sendInfo($this->lng->txt('select_at_least_one_thread'));
            $this->showThreadsObject();
            return;
        }

        $confirmation = new ilConfirmationGUI();
        $confirmation->setFormAction($this->ctrl->getFormAction($this, 'deleteThreadDrafts'));
        $confirmation->setHeaderText($this->lng->txt('sure_delete_drafts'));
        $confirmation->setCancel($this->lng->txt('cancel'), 'showThreads');
        $confirmation->setConfirm($this->lng->txt('confirm'), 'deleteThreadDrafts');
        $instances = \ilForumPostDraft::getDraftInstancesByUserId($this->user->getId());
        foreach ($draftIds as $draftId) {
            if (array_key_exists($draftId, $instances)) {
                $confirmation->addItem('draft_ids[]', $draftId, $instances[$draftId]->getPostSubject());
            }
        }

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

    public function prepareThreadScreen(ilObjForum $a_forum_obj)
    {
        $this->ilHelp->setScreenIdComponent("frm");

        $this->tpl->loadStandardTemplate();
        ilUtil::sendInfo();
        ilUtil::infoPanel();

        $this->tpl->setTitleIcon(ilObject::_getIcon("", "big", "frm"));
        $this->tabs->setBackTarget(
            $this->lng->txt('all_topics'),
            $this->ctrl->getLinkTarget(
                $this,
                'showThreads'
            )
        );

        $frm = $a_forum_obj->Forum;
        $frm->setForumId($a_forum_obj->getId());
    }

    public function performPostActivationObject()
    {
        if (!$this->is_moderator) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $this->ensureThreadBelongsToForum((int) $this->object->getId(), $this->objCurrentPost->getThread());

        $this->objCurrentPost->activatePost();
        $GLOBALS['ilAppEventHandler']->raise(
            'Modules/Forum',
            'activatedPost',
            array(
                'ref_id' => $this->object->getRefId(),
                'post' => $this->objCurrentPost
            )
        );
        ilUtil::sendInfo($this->lng->txt('forums_post_was_activated'), true);

        $this->viewThreadObject();
    }

    private function deletePostingObject()
    {
        if (
            !$this->objCurrentTopic->isClosed() && (
                $this->is_moderator ||
                ($this->objCurrentPost->isOwner($this->user->getId()) && !$this->objCurrentPost->hasReplies())
            ) &&
            !$this->user->isAnonymous()
        ) {
            $this->ensureThreadBelongsToForum((int) $this->object->getId(), $this->objCurrentPost->getThread());

            $oForumObjects = $this->getForumObjects();
            $forumObj = $oForumObjects['forumObj'];

            $frm = new ilForum();
            $frm->setForumId($forumObj->getId());
            $frm->setForumRefId($forumObj->getRefId());
            $dead_thr = $frm->deletePost($this->objCurrentPost->getId());

            // if complete thread was deleted ...
            if ($dead_thr == $this->objCurrentTopic->getId()) {
                $frm->setMDB2WhereCondition('top_frm_fk = %s ', array('integer'), array($forumObj->getId()));
                $topicData = $frm->getOneTopic();
                ilUtil::sendInfo($this->lng->txt('forums_post_deleted'), true);
                if ($topicData['top_num_threads'] > 0) {
                    $this->ctrl->redirect($this, 'showThreads');
                } else {
                    $this->ctrl->redirect($this, 'createThread');
                }
            }
            ilUtil::sendInfo($this->lng->txt('forums_post_deleted'), true);
            $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentTopic->getId());
            $this->ctrl->redirect($this, 'viewThread');
        }

        $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
    }

    private function deletePostingDraftObject()
    {
        $this->deleteSelectedDraft();
    }

    private function revokeCensorshipObject()
    {
        $this->handleCensorship(true);
    }

    private function addCensorshipObject()
    {
        $this->handleCensorship();
    }

    private function getModalActions() : string
    {
        $modalString = '';
        foreach ($this->modalActionsContainer as $modal) {
            $modalString .= $this->uiRenderer->render($modal);
        }

        return $modalString;
    }

    private function handleCensorship($wasRevoked = false)
    {
        if (!$this->objCurrentTopic->isClosed() && $this->is_moderator) {
            $message = $this->handleFormInput($_POST['formData']['cens_message']);
            if ($message === '') {
                $message = $this->handleFormInput($_POST['cens_message']);
            }
            $this->ensureThreadBelongsToForum((int) $this->object->getId(), $this->objCurrentPost->getThread());

            $oForumObjects = $this->getForumObjects();
            $frm = $oForumObjects['frm'];

            if ($wasRevoked) {
                $frm->postCensorship($message, $this->objCurrentPost->getId());
                ilUtil::sendSuccess($this->lng->txt('frm_censorship_revoked'));
            } else {
                $frm->postCensorship($message, $this->objCurrentPost->getId(), 1);
                ilUtil::sendSuccess($this->lng->txt('frm_censorship_applied'));
            }

            $this->viewThreadObject();
            return;
        }

        $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
    }

    public function askForPostActivationObject()
    {
        if (!$this->is_moderator) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $this->setDisplayConfirmPostActivation(true);

        $this->viewThreadObject();
    }

    public function setDisplayConfirmPostActivation($status = 0)
    {
        $this->display_confirm_post_activation = $status;
    }

    public function displayConfirmPostActivation()
    {
        return $this->display_confirm_post_activation;
    }

    protected function toggleThreadNotificationObject()
    {
        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $this->ensureThreadBelongsToForum((int) $this->object->getId(), $this->objCurrentTopic);

        if ($this->objCurrentTopic->isNotificationEnabled($this->user->getId())) {
            $this->objCurrentTopic->disableNotification($this->user->getId());
            \ilUtil::sendInfo($this->lng->txt('forums_notification_disabled'));
        } else {
            $this->objCurrentTopic->enableNotification($this->user->getId());
            \ilUtil::sendInfo($this->lng->txt('forums_notification_enabled'));
        }

        $this->viewThreadObject();
    }

    protected function toggleStickinessObject()
    {
        if (!$this->is_moderator) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $this->ensureThreadBelongsToForum((int) $this->object->getId(), $this->objCurrentTopic);

        if ($this->objCurrentTopic->isSticky()) {
            $this->objCurrentTopic->unmakeSticky();
        } else {
            $this->objCurrentTopic->makeSticky();
        }

        $this->viewThreadObject();
    }

    public function cancelPostObject()
    {
        $this->requestAction = '';
        if (isset($_POST['draft_id']) && (int) $_POST['draft_id'] > 0) {
            $draft = ilForumPostDraft::newInstanceByDraftId((int) $_POST['draft_id']);
            $draft->deleteDraftsByDraftIds(array((int) $_POST['draft_id']));
        }

        $this->viewThreadObject();
    }

    public function cancelDraftObject()
    {
        $this->requestAction = '';
        if (isset($_GET['draft_id']) && (int) $_GET['draft_id'] > 0) {
            if (ilForumPostDraft::isAutoSavePostDraftAllowed()) {
                $history_obj = new ilForumDraftsHistory();
                $history_obj->getFirstAutosaveByDraftId((int) $_GET['draft_id']);
                $draft = ilForumPostDraft::newInstanceByDraftId((int) $_GET['draft_id']);
                $draft->setPostSubject($history_obj->getPostSubject());
                $draft->setPostMessage($history_obj->getPostMessage());

                ilForumUtil::moveMediaObjects(
                    $history_obj->getPostMessage(),
                    ilForumDraftsHistory::MEDIAOBJECT_TYPE,
                    $history_obj->getHistoryId(),
                    ilForumPostDraft::MEDIAOBJECT_TYPE,
                    $draft->getDraftId()
                );

                $draft->updateDraft();

                $history_obj->deleteHistoryByDraftIds(array($draft->getDraftId()));
            }
        }
        $this->ctrl->clearParameters($this);
        $this->viewThreadObject();
    }

    public function getActivationFormHTML()
    {
        $form_tpl = new ilTemplate('tpl.frm_activation_post_form.html', true, true, 'Modules/Forum');
        $this->ctrl->setParameter($this, 'pos_pk', $this->objCurrentPost->getId());
        $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentPost->getThreadId());
        $this->ctrl->setParameter(
            $this,
            'orderby',
            ilUtil::stripSlashes($this->httpRequest->getQueryParams()['orderby'])
        );
        $form_tpl->setVariable('FORM_ACTION', $this->ctrl->getFormAction($this, 'performPostActivation'));
        $form_tpl->setVariable('SPACER', '<hr noshade="noshade" width="100%" size="1" align="center" />');
        $form_tpl->setVariable('ANCHOR', $this->objCurrentPost->getId());
        $form_tpl->setVariable('TXT_ACT', $this->lng->txt('activate_post_txt'));
        $form_tpl->setVariable('CONFIRM_BUTTON', $this->lng->txt('activate_only_current'));
        $form_tpl->setVariable('CMD_CONFIRM', 'performPostActivation');
        $form_tpl->setVariable('CANCEL_BUTTON', $this->lng->txt('cancel'));
        $form_tpl->setVariable('CMD_CANCEL', 'viewThread');
        $this->ctrl->clearParameters($this);

        return $form_tpl->get();
    }

    public function getCensorshipFormHTML()
    {
        $frm = $this->object->Forum;
        $form_tpl = new ilTemplate('tpl.frm_censorship_post_form.html', true, true, 'Modules/Forum');

        $form_tpl->setVariable('ANCHOR', $this->objCurrentPost->getId());
        $form_tpl->setVariable('SPACER', '<hr noshade="noshade" width="100%" size="1" align="center" />');
        $this->ctrl->setParameter($this, 'pos_pk', $this->objCurrentPost->getId());
        $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentPost->getThreadId());
        $this->ctrl->setParameter(
            $this,
            'orderby',
            ilUtil::stripSlashes($this->httpRequest->getQueryParams()['orderby'])
        );
        $form_tpl->setVariable('FORM_ACTION', $this->ctrl->getFormAction($this, 'viewThread'));
        $this->ctrl->clearParameters($this);
        $form_tpl->setVariable('TXT_CENS_MESSAGE', $this->lng->txt('forums_the_post'));
        $form_tpl->setVariable('TXT_CENS_COMMENT', $this->lng->txt('forums_censor_comment') . ':');
        $form_tpl->setVariable('CENS_MESSAGE', $frm->prepareText($this->objCurrentPost->getCensorshipComment(), 2));

        if ($this->objCurrentPost->isCensored()) {
            $form_tpl->setVariable('TXT_CENS', $this->lng->txt('forums_info_censor2_post'));
            $form_tpl->setVariable('YES_BUTTON', $this->lng->txt('confirm'));
            $form_tpl->setVariable('NO_BUTTON', $this->lng->txt('cancel'));
            $form_tpl->setVariable('CMD_REVOKE_CENSORSHIP', 'revokeCensorship');
            $form_tpl->setVariable('CMD_CANCEL_REVOKE_CENSORSHIP', 'viewThread');
        } else {
            $form_tpl->setVariable('TXT_CENS', $this->lng->txt('forums_info_censor_post'));
            $form_tpl->setVariable('CANCEL_BUTTON', $this->lng->txt('cancel'));
            $form_tpl->setVariable('CONFIRM_BUTTON', $this->lng->txt('confirm'));
            $form_tpl->setVariable('CMD_ADD_CENSORSHIP', 'addCensorship');
            $form_tpl->setVariable('CMD_CANCEL_ADD_CENSORSHIP', 'viewThread');
        }

        return $form_tpl->get();
    }

    private function initReplyEditForm()
    {
        $isReply = in_array($this->requestAction, ['showreply', 'ready_showreply']);
        $isDraft = in_array($this->requestAction, ['publishDraft', 'editdraft']);

        // init objects
        $oForumObjects = $this->getForumObjects();
        $frm = $oForumObjects['frm'];
        $oFDForum = $oForumObjects['file_obj'];

        $this->replyEditForm = new ilPropertyFormGUI();
        $this->replyEditForm->setId('id_showreply');
        $this->replyEditForm->setTableWidth('100%');
        $cancel_cmd = 'cancelPost';
        if (in_array($this->requestAction, ['showreply', 'ready_showreply'])) {
            $this->ctrl->setParameter($this, 'action', 'ready_showreply');
        } elseif (in_array($this->requestAction, ['showdraft', 'editdraft'])) {
            $this->ctrl->setParameter($this, 'action', $this->requestAction);
            $this->ctrl->setParameter($this, 'draft_id', (int) $_GET['draft_id']);
        } else {
            $this->ctrl->setParameter($this, 'action', 'ready_showedit');
        }

        $this->ctrl->setParameter($this, 'page', (int) $this->httpRequest->getQueryParams()['page']);
        $this->ctrl->setParameter(
            $this,
            'orderby',
            \ilUtil::stripSlashes($this->httpRequest->getQueryParams()['orderby'])
        );
        $this->ctrl->setParameter($this, 'pos_pk', $this->objCurrentPost->getId());
        $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentPost->getThreadId());
        if ($this->isTopLevelReplyCommand()) {
            $this->replyEditForm->setFormAction(
                $this->ctrl->getFormAction($this, 'saveTopLevelPost'),
                'frm_page_bottom'
            );
        } elseif (in_array($this->requestAction, ['publishDraft', 'editdraft'])) {
            $this->replyEditForm->setFormAction(
                $this->ctrl->getFormAction($this, 'publishDraft'),
                $this->objCurrentPost->getId()
            );
        } else {
            $this->replyEditForm->setFormAction(
                $this->ctrl->getFormAction($this, 'savePost'),
                $this->objCurrentPost->getId()
            );
        }
        $this->ctrl->clearParameters($this);

        if ($isReply) {
            $this->replyEditForm->setTitle($this->lng->txt('forums_your_reply'));
        } elseif ($isDraft) {
            $this->replyEditForm->setTitle($this->lng->txt('forums_edit_draft'));
        } else {
            $this->replyEditForm->setTitle($this->lng->txt('forums_edit_post'));
        }

        if (
            $this->isWritingWithPseudonymAllowed() &&
            in_array($this->requestAction, ['showreply', 'ready_showreply', 'editdraft'])
        ) {
            $oAnonymousNameGUI = new ilTextInputGUI($this->lng->txt('forums_your_name'), 'alias');
            $oAnonymousNameGUI->setMaxLength(64);
            $oAnonymousNameGUI->setInfo($this->lng->txt('forums_use_alias'));

            $this->replyEditForm->addItem($oAnonymousNameGUI);
        }

        $oSubjectGUI = new ilTextInputGUI($this->lng->txt('forums_subject'), 'subject');
        $oSubjectGUI->setMaxLength(255);
        $oSubjectGUI->setRequired(true);

        if ($this->objProperties->getSubjectSetting() == 'empty_subject') {
            $oSubjectGUI->setInfo($this->lng->txt('enter_new_subject'));
        }

        $this->replyEditForm->addItem($oSubjectGUI);

        $oPostGUI = new ilTextAreaInputGUI(
            $isReply ? $this->lng->txt('forums_your_reply') : $this->lng->txt('forums_edit_post'),
            'message'
        );
        $oPostGUI->setRequired(true);
        $oPostGUI->setRows(15);
        $oPostGUI->setUseRte(true);
        $oPostGUI->addPlugin('latex');
        $oPostGUI->addButton('latex');
        $oPostGUI->addButton('pastelatex');

        $quotingAllowed = (
            !$this->isTopLevelReplyCommand() && (
                ($isReply && $this->objCurrentPost->getDepth() >= 2) ||
                (!$isDraft && !$isReply && $this->objCurrentPost->getDepth() > 2) ||
                ($isDraft && $this->objCurrentPost->getDepth() >= 2)
            )
        );
        if ($quotingAllowed) {
            $oPostGUI->addPlugin('ilfrmquote');
            $oPostGUI->addButton('ilFrmQuoteAjaxCall');
        }

        $oPostGUI->removePlugin('advlink');
        $oPostGUI->setRTERootBlockElement('');
        $oPostGUI->usePurifier(true);
        $oPostGUI->disableButtons(array(
            'charmap',
            'undo',
            'redo',
            'justifyleft',
            'justifycenter',
            'justifyright',
            'justifyfull',
            'anchor',
            'fullscreen',
            'cut',
            'copy',
            'paste',
            'pastetext',
            'formatselect'
        ));

        if (in_array($this->requestAction, ['showreply', 'ready_showreply', 'showdraft', 'editdraft'])) {
            $oPostGUI->setRTESupport(
                $this->user->getId(),
                'frm~',
                'frm_post',
                'tpl.tinymce_frm_post.js',
                false,
                '5.6.0'
            );
        } else {
            $oPostGUI->setRTESupport(
                $this->objCurrentPost->getId(),
                'frm',
                'frm_post',
                'tpl.tinymce_frm_post.js',
                false,
                '5.6.0'
            );
        }
        // purifier
        $oPostGUI->setPurifier(ilHtmlPurifierFactory::_getInstanceByType('frm_post'));

        $this->replyEditForm->addItem($oPostGUI);

        // notification only if gen. notification is disabled and forum isn't anonymous
        $umail = new ilMail($this->user->getId());
        if ($this->rbac->system()->checkAccess('internal_mail', $umail->getMailObjectReferenceId()) &&
            !$frm->isThreadNotificationEnabled($this->user->getId(), $this->objCurrentPost->getThreadId()) &&
            !$this->objProperties->isAnonymized()) {
            $oNotificationGUI = new ilCheckboxInputGUI($this->lng->txt('forum_direct_notification'), 'notify');
            $oNotificationGUI->setInfo($this->lng->txt('forum_notify_me'));

            $this->replyEditForm->addItem($oNotificationGUI);
        }

        if ($this->objProperties->isFileUploadAllowed()) {
            $oFileUploadGUI = new ilFileWizardInputGUI($this->lng->txt('forums_attachments_add'), 'userfile');
            $oFileUploadGUI->setFilenames(array(0 => ''));
            $this->replyEditForm->addItem($oFileUploadGUI);
        }

        if (
            $this->user->isAnonymous() &&
            !$this->user->isCaptchaVerified() &&
            ilCaptchaUtil::isActiveForForum()
        ) {
            $captcha = new ilCaptchaInputGUI($this->lng->txt('cont_captcha_code'), 'captcha_code');
            $captcha->setRequired(true);
            $this->replyEditForm->addItem($captcha);
        }

        $attachments_of_node = $oFDForum->getFilesOfPost();
        if (count($attachments_of_node) && in_array($this->requestAction, ['showedit', 'ready_showedit'])) {
            $oExistingAttachmentsGUI = new ilCheckboxGroupInputGUI($this->lng->txt('forums_delete_file'), 'del_file');
            foreach ($oFDForum->getFilesOfPost() as $file) {
                $oAttachmentGUI = new ilCheckboxInputGUI($file['name'], 'del_file');
                $oAttachmentGUI->setValue($file['md5']);
                $oExistingAttachmentsGUI->addOption($oAttachmentGUI);
            }
            $this->replyEditForm->addItem($oExistingAttachmentsGUI);
        }

        if (ilForumPostDraft::isAutoSavePostDraftAllowed()) {
            if (in_array($this->requestAction, ['showdraft', 'editdraft'])) {
                $draftInfoGUI = new ilNonEditableValueGUI('', 'autosave_info', true);
                $draftInfoGUI->setValue(sprintf(
                    $this->lng->txt('autosave_draft_info'),
                    ilForumPostDraft::lookupAutosaveInterval()
                ));
                $this->replyEditForm->addItem($draftInfoGUI);
            } elseif (!in_array($this->requestAction, ['showedit', 'ready_showedit'])) {
                $draftInfoGUI = new ilNonEditableValueGUI('', 'autosave_info', true);
                $draftInfoGUI->setValue(sprintf(
                    $this->lng->txt('autosave_post_draft_info'),
                    ilForumPostDraft::lookupAutosaveInterval()
                ));
                $this->replyEditForm->addItem($draftInfoGUI);
            }
        }

        $selected_draft_id = (int) $_GET['draft_id'];
        $draftObj = new ilForumPostDraft(
            $this->user->getId(),
            $this->objCurrentPost->getId(),
            $selected_draft_id
        );
        if ($draftObj->getDraftId() > 0) {
            $oFDForumDrafts = new ilFileDataForumDrafts(0, $draftObj->getDraftId());
            if (count($oFDForumDrafts->getFilesOfPost())) {
                $oExistingAttachmentsGUI = new ilCheckboxGroupInputGUI(
                    $this->lng->txt('forums_delete_file'),
                    'del_file'
                );
                foreach ($oFDForumDrafts->getFilesOfPost() as $file) {
                    $oAttachmentGUI = new ilCheckboxInputGUI($file['name'], 'del_file');
                    $oAttachmentGUI->setValue($file['md5']);
                    $oExistingAttachmentsGUI->addOption($oAttachmentGUI);
                }
                $this->replyEditForm->addItem($oExistingAttachmentsGUI);
            }
        }

        if ($this->isTopLevelReplyCommand()) {
            $this->replyEditForm->addCommandButton('saveTopLevelPost', $this->lng->txt('create'));
        } elseif (ilForumPostDraft::isSavePostDraftAllowed() && $this->requestAction == 'editdraft') {
            $this->replyEditForm->addCommandButton('publishDraft', $this->lng->txt('publish'));
        } else {
            $this->replyEditForm->addCommandButton('savePost', $this->lng->txt('save'));
        }
        $hidden_draft_id = new ilHiddenInputGUI('draft_id');
        if (isset($_GET['draft_id']) && (int) $_GET['draft_id'] > 0) {
            $auto_save_draft_id = (int) $_GET['draft_id'];
        }
        $hidden_draft_id->setValue($auto_save_draft_id);
        $this->replyEditForm->addItem($hidden_draft_id);

        if (in_array($this->requestAction, ['showreply', 'ready_showreply', 'editdraft'])) {
            $rtestring = ilRTE::_getRTEClassname();

            if (array_key_exists('show_rte', $_POST)) {
                ilObjAdvancedEditing::_setRichTextEditorUserState($_POST['show_rte']);
            }

            if (strtolower($rtestring) != 'iltinymce' || !ilObjAdvancedEditing::_getRichTextEditorUserState()) {
                if ($quotingAllowed) {
                    $this->replyEditForm->addCommandButton('quotePost', $this->lng->txt('forum_add_quote'));
                }
            }

            if (
                !$this->user->isAnonymous() &&
                in_array($this->requestAction, ['editdraft', 'showreply', 'ready_showreply']) &&
                ilForumPostDraft::isSavePostDraftAllowed()
            ) {
                if (ilForumPostDraft::isAutoSavePostDraftAllowed()) {
                    $this->decorateWithAutosave($this->replyEditForm);
                }

                if ($this->requestAction == 'editdraft') {
                    $this->replyEditForm->addCommandButton('updateDraft', $this->lng->txt('save_message'));
                } elseif ($this->isTopLevelReplyCommand()) {
                    $this->replyEditForm->addCommandButton('saveTopLevelDraft', $this->lng->txt('save_message'));
                } else {
                    $this->replyEditForm->addCommandButton('saveAsDraft', $this->lng->txt('save_message'));
                }

                $cancel_cmd = 'cancelDraft';
            }
        }
        $this->replyEditForm->addCommandButton($cancel_cmd, $this->lng->txt('cancel'));
    }

    private function getReplyEditForm()
    {
        if (null === $this->replyEditForm) {
            $this->initReplyEditForm();
        }

        return $this->replyEditForm;
    }

    public function createTopLevelPostObject()
    {
        if (isset($_GET['draft_id']) && (int) $_GET['draft_id'] > 0 && !$this->user->isAnonymous()
            && ilForumPostDraft::isSavePostDraftAllowed()) {
            $draft_obj = new ilForumPostDraft(
                $this->user->getId(),
                $this->objCurrentPost->getId(),
                (int) $_GET['draft_id']
            );
        }

        if ($draft_obj instanceof ilForumPostDraft && $draft_obj->getDraftId() > 0) {
            $this->ctrl->setParameter($this, 'action', 'editdraft');
            $this->ctrl->setParameter($this, 'pos_pk', $this->objCurrentPost->getId());
            $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentTopic->getId());
            $this->ctrl->setParameter($this, 'draft_id', $draft_obj->getDraftId());
            $this->ctrl->setParameter($this, 'page', 0);
            $this->ctrl->setParameter(
                $this,
                'orderby',
                \ilUtil::stripSlashes($this->httpRequest->getQueryParams()['orderby'])
            );
            $this->ctrl->redirect($this, 'editDraft');
        } else {
            $this->viewThreadObject();
        }
        return;
    }

    public function saveTopLevelPostObject()
    {
        $this->savePostObject();
        return;
    }

    public function publishSelectedDraftObject()
    {
        if (isset($_GET['draft_id']) && (int) $_GET['draft_id'] > 0) {
            $this->publishDraftObject(false);
        }
    }

    public function publishDraftObject($use_replyform = true)
    {
        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        if (!$this->access->checkAccess('add_reply', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        if (!$this->objCurrentTopic->getId()) {
            \ilUtil::sendFailure($this->lng->txt('frm_action_not_possible_thr_deleted'), true);
            $this->ctrl->redirect($this);
        }

        if ($this->objCurrentTopic->isClosed()) {
            \ilUtil::sendFailure($this->lng->txt('frm_action_not_possible_thr_closed'), true);
            $this->ctrl->redirect($this);
        }

        if (!$this->objCurrentPost->getId()) {
            $this->requestAction = '';
            \ilUtil::sendFailure($this->lng->txt('frm_action_not_possible_parent_deleted'));
            $this->viewThreadObject();
            return;
        }

        $post_id = $this->objCurrentPost->getId();

        $draft_obj = new ilForumPostDraft($this->user->getId(), $post_id, (int) $_GET['draft_id']);

        if ($use_replyform) {
            $oReplyEditForm = $this->getReplyEditForm();
            if (!$oReplyEditForm->checkInput()) {
                $oReplyEditForm->setValuesByPost();
                return $this->viewThreadObject();
            }
            $post_subject = $oReplyEditForm->getInput('subject');
            $post_message = $oReplyEditForm->getInput('message');
            $mob_direction = 0;
        } else {
            $post_subject = $draft_obj->getPostSubject();
            $post_message = $draft_obj->getPostMessage();
            $mob_direction = 1;
        }

        if ($draft_obj->getDraftId() > 0) {
            // init objects
            $oForumObjects = $this->getForumObjects();
            $frm = $oForumObjects['frm'];
            $frm->setMDB2WhereCondition(' top_frm_fk = %s ', array('integer'), array($frm->getForumId()));

            // reply: new post
            $status = 1;
            $send_activation_mail = 0;

            if ($this->objProperties->isPostActivationEnabled()) {
                if (!$this->is_moderator) {
                    $status = 0;
                    $send_activation_mail = 1;
                } elseif ($this->objCurrentPost->isAnyParentDeactivated()) {
                    $status = 0;
                }
            }

            $newPost = $frm->generatePost(
                $draft_obj->getForumId(),
                $draft_obj->getThreadId(),
                $this->user->getId(),
                $draft_obj->getPostDisplayUserId(),
                ilRTE::_replaceMediaObjectImageSrc($post_message, $mob_direction),
                $draft_obj->getPostId(),
                (int) $draft_obj->getNotify(),
                $this->handleFormInput($post_subject, false),
                $draft_obj->getPostUserAlias(),
                '',
                $status,
                $send_activation_mail
            );

            $this->object->markPostRead(
                $this->user->getId(),
                (int) $this->objCurrentTopic->getId(),
                (int) $this->objCurrentPost->getId()
            );

            $uploadedObjects = ilObjMediaObject::_getMobsOfObject('frm~:html', $this->user->getId());

            foreach ($uploadedObjects as $mob) {
                ilObjMediaObject::_removeUsage($mob, 'frm~:html', $this->user->getId());
                ilObjMediaObject::_saveUsage($mob, 'frm:html', $newPost);
            }
            ilForumUtil::saveMediaObjects($post_message, 'frm:html', $newPost, $mob_direction);

            if ($this->objProperties->isFileUploadAllowed()) {
                $file = $_FILES['userfile'];
                if (is_array($file) && !empty($file)) {
                    $tmp_file_obj = new ilFileDataForum($this->object->getId(), $newPost);
                    $tmp_file_obj->storeUploadedFile($file);
                }

                //move files of draft to posts directory
                $oFDForum = new ilFileDataForum($this->object->getId(), $newPost);
                $oFDForumDrafts = new ilFileDataForumDrafts($this->object->getId(), $draft_obj->getDraftId());

                $oFDForumDrafts->moveFilesOfDraft($oFDForum->getForumPath(), $newPost);
                $oFDForumDrafts->delete();
            }

            if (ilForumPostDraft::isSavePostDraftAllowed()) {
                $GLOBALS['ilAppEventHandler']->raise(
                    'Modules/Forum',
                    'publishedDraft',
                    array(
                        'draftObj' => $draft_obj,
                        'obj_id' => $this->object->getId(),
                        'is_file_upload_allowed' => $this->objProperties->isFileUploadAllowed()
                    )
                );
            }
            $draft_obj->deleteDraft();

            $GLOBALS['ilAppEventHandler']->raise(
                'Modules/Forum',
                'createdPost',
                array(
                    'ref_id' => $this->object->getRefId(),
                    'post' => new ilForumPost($newPost),
                    'notify_moderators' => (bool) $send_activation_mail
                )
            );

            $message = '';
            if (!$this->is_moderator && !$status) {
                $message .= $this->lng->txt('forums_post_needs_to_be_activated');
            } else {
                $message .= $this->lng->txt('forums_post_new_entry');
            }

            $_SESSION['frm'][(int) $_GET['thr_pk']]['openTreeNodes'][] = (int) $this->objCurrentPost->getId();

            $this->ctrl->clearParameters($this);
            ilUtil::sendSuccess($message, true);
            $this->ctrl->setParameter($this, 'pos_pk', $newPost);
            $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentPost->getThreadId());

            $this->ctrl->redirect($this, 'viewThread');
        }
    }

    public function savePostObject()
    {
        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        if (!$this->objCurrentTopic->getId()) {
            \ilUtil::sendFailure($this->lng->txt('frm_action_not_possible_thr_deleted'), true);
            $this->ctrl->redirect($this);
        }

        if ($this->objCurrentTopic->isClosed()) {
            \ilUtil::sendFailure($this->lng->txt('frm_action_not_possible_thr_closed'), true);
            $this->ctrl->redirect($this);
        }

        $this->ensureThreadBelongsToForum((int) $this->object->getId(), $this->objCurrentTopic);

        if (!isset($_POST['del_file']) || !is_array($_POST['del_file'])) {
            $_POST['del_file'] = array();
        }

        $oReplyEditForm = $this->getReplyEditForm();
        if ($oReplyEditForm->checkInput()) {
            if (!$this->objCurrentPost->getId()) {
                $this->requestAction = '';
                \ilUtil::sendFailure($this->lng->txt('frm_action_not_possible_parent_deleted'));
                $this->viewThreadObject();
                return;
            }

            $this->doCaptchaCheck();

            // init objects
            $oForumObjects = $this->getForumObjects();
            $forumObj = $oForumObjects['forumObj'];
            $frm = $oForumObjects['frm'];
            $frm->setMDB2WhereCondition(' top_frm_fk = %s ', array('integer'), array($frm->getForumId()));
            $topicData = $frm->getOneTopic();

            // Generating new posting
            if ($this->requestAction == 'ready_showreply') {
                if (!$this->access->checkAccess('add_reply', '', (int) $_GET['ref_id'])) {
                    $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
                }

                // reply: new post
                $status = 1;
                $send_activation_mail = 0;

                if ($this->objProperties->isPostActivationEnabled()) {
                    if (!$this->is_moderator) {
                        $status = 0;
                        $send_activation_mail = 1;
                    } elseif ($this->objCurrentPost->isAnyParentDeactivated()) {
                        $status = 0;
                    }
                }

                if ($this->isWritingWithPseudonymAllowed()) {
                    if (!strlen($oReplyEditForm->getInput('alias'))) {
                        $user_alias = $this->lng->txt('forums_anonymous');
                    } else {
                        $user_alias = $oReplyEditForm->getInput('alias');
                    }
                    $display_user_id = 0;
                } else {
                    $user_alias = $this->user->getLogin();
                    $display_user_id = $this->user->getId();
                }

                $newPost = $frm->generatePost(
                    $topicData['top_pk'],
                    $this->objCurrentTopic->getId(),
                    $this->user->getId(),
                    $display_user_id,
                    ilRTE::_replaceMediaObjectImageSrc($oReplyEditForm->getInput('message'), 0),
                    $this->objCurrentPost->getId(),
                    (int) $oReplyEditForm->getInput('notify'),
                    $this->handleFormInput($oReplyEditForm->getInput('subject'), false),
                    $user_alias,
                    '',
                    $status,
                    $send_activation_mail
                );

                if (ilForumPostDraft::isSavePostDraftAllowed()) {
                    $draft_id = 0;
                    if (ilForumPostDraft::isAutoSavePostDraftAllowed()) {
                        $draft_id = $_POST['draft_id']; // info aus dem autosave?
                    }
                    $draft_obj = new ilForumPostDraft($this->user->getId(), $this->objCurrentPost->getId(), $draft_id);
                    if ($draft_obj instanceof ilForumPostDraft) {
                        $draft_obj->deleteDraft();
                    }
                }

                // mantis #8115: Mark parent as read
                $this->object->markPostRead(
                    $this->user->getId(),
                    (int) $this->objCurrentTopic->getId(),
                    (int) $this->objCurrentPost->getId()
                );

                // copy temporary media objects (frm~)
                ilForumUtil::moveMediaObjects(
                    $oReplyEditForm->getInput('message'),
                    'frm~:html',
                    $this->user->getId(),
                    'frm:html',
                    $newPost
                );

                if ($this->objProperties->isFileUploadAllowed()) {
                    $oFDForum = new ilFileDataForum($forumObj->getId(), $newPost);
                    $file = $_FILES['userfile'];
                    if (is_array($file) && !empty($file)) {
                        $oFDForum->storeUploadedFile($file);
                    }
                }

                $GLOBALS['ilAppEventHandler']->raise(
                    'Modules/Forum',
                    'createdPost',
                    array(
                        'ref_id' => $this->object->getRefId(),
                        'post' => new ilForumPost($newPost),
                        'notify_moderators' => (bool) $send_activation_mail
                    )
                );

                $message = '';
                if (!$this->is_moderator && !$status) {
                    $message .= $this->lng->txt('forums_post_needs_to_be_activated');
                } else {
                    $message .= $this->lng->txt('forums_post_new_entry');
                }

                ilUtil::sendSuccess($message, true);
                $this->ctrl->clearParameters($this);
                $this->ctrl->setParameter($this, 'post_created_below', $this->objCurrentPost->getId());
                $this->ctrl->setParameter($this, 'pos_pk', $newPost);
                $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentPost->getThreadId());
                $this->ctrl->redirect($this, 'viewThread');
            } else {
                if ((!$this->is_moderator &&
                        !$this->objCurrentPost->isOwner($this->user->getId())) || $this->objCurrentPost->isCensored() ||
                    $this->user->isAnonymous()) {
                    $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
                }

                $this->ensureThreadBelongsToForum((int) $this->object->getId(), $this->objCurrentPost->getThread());

                // remove usage of deleted media objects
                $oldMediaObjects = ilObjMediaObject::_getMobsOfObject('frm:html', $this->objCurrentPost->getId());
                $curMediaObjects = ilRTE::_getMediaObjects($oReplyEditForm->getInput('message'), 0);
                foreach ($oldMediaObjects as $oldMob) {
                    $found = false;
                    foreach ($curMediaObjects as $curMob) {
                        if ($oldMob == $curMob) {
                            $found = true;
                            break;
                        }
                    }
                    if (!$found) {
                        if (ilObjMediaObject::_exists($oldMob)) {
                            ilObjMediaObject::_removeUsage($oldMob, 'frm:html', $this->objCurrentPost->getId());
                            $mob_obj = new ilObjMediaObject($oldMob);
                            $mob_obj->delete();
                        }
                    }
                }

                // save old activation status for send_notification decision
                $old_status_was_active = $this->objCurrentPost->isActivated();

                // if active post has been edited posting mus be activated again by moderator
                $status = 1;
                $send_activation_mail = 0;

                if ($this->objProperties->isPostActivationEnabled()) {
                    if (!$this->is_moderator) {
                        $status = 0;
                        $send_activation_mail = 1;
                    } elseif ($this->objCurrentPost->isAnyParentDeactivated()) {
                        $status = 0;
                    }
                }
                $this->objCurrentPost->setStatus($status);

                $this->objCurrentPost->setSubject($this->handleFormInput($oReplyEditForm->getInput('subject'), false));
                $this->objCurrentPost->setMessage(ilRTE::_replaceMediaObjectImageSrc(
                    $oReplyEditForm->getInput('message'),
                    0
                ));
                $this->objCurrentPost->setNotification((int) $oReplyEditForm->getInput('notify'));
                $this->objCurrentPost->setChangeDate(date('Y-m-d H:i:s'));
                $this->objCurrentPost->setUpdateUserId($this->user->getId());

                // edit: update post
                if ($this->objCurrentPost->update()) {
                    $this->objCurrentPost->reload();

                    // Change news item accordingly
                    // note: $this->objCurrentPost->getForumId() does not give us the forum ID here (why?)
                    $news_id = ilNewsItem::getFirstNewsIdForContext(
                        $forumObj->getId(),
                        'frm',
                        $this->objCurrentPost->getId(),
                        'pos'
                    );
                    if ($news_id > 0) {
                        $news_item = new ilNewsItem($news_id);
                        $news_item->setTitle($this->objCurrentPost->getSubject());
                        $news_item->setContent(
                            ilRTE::_replaceMediaObjectImageSrc($frm->prepareText(
                                $this->objCurrentPost->getMessage(),
                                0
                            ), 1)
                        );

                        if ($this->objCurrentPost->getMessage() != strip_tags($this->objCurrentPost->getMessage())) {
                            $news_item->setContentHtml(true);
                        } else {
                            $news_item->setContentHtml(false);
                        }
                        $news_item->update();
                    }

                    $oFDForum = $oForumObjects['file_obj'];

                    $file2delete = $oReplyEditForm->getInput('del_file');
                    if (is_array($file2delete) && count($file2delete)) {
                        $oFDForum->unlinkFilesByMD5Filenames($file2delete);
                    }

                    if ($this->objProperties->isFileUploadAllowed()) {
                        $file = $_FILES['userfile'];
                        if (is_array($file) && !empty($file)) {
                            $oFDForum->storeUploadedFile($file);
                        }
                    }

                    $GLOBALS['ilAppEventHandler']->raise(
                        'Modules/Forum',
                        'updatedPost',
                        array(
                            'ref_id' => $this->object->getRefId(),
                            'post' => $this->objCurrentPost,
                            'notify_moderators' => (bool) $send_activation_mail,
                            'old_status_was_active' => (bool) $old_status_was_active
                        )
                    );

                    ilUtil::sendSuccess($this->lng->txt('forums_post_modified'), true);
                }

                $this->ctrl->setParameter($this, 'pos_pk', $this->objCurrentPost->getId());
                $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentPost->getThreadId());
                $this->ctrl->setParameter($this, 'viewmode', $this->selectedSorting);
                $this->ctrl->redirect($this, 'viewThread');
            }
        } else {
            $this->requestAction = substr($this->requestAction, 6);
        }
        return $this->viewThreadObject();
    }

    private function hideToolbar($a_flag = null)
    {
        if (null === $a_flag) {
            return $this->hideToolbar;
        }

        $this->hideToolbar = $a_flag;
        return $this;
    }

    public function quotePostObject()
    {
        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        if (!is_array($_POST['del_file'])) {
            $_POST['del_file'] = array();
        }

        if ($this->objCurrentTopic->isClosed()) {
            $this->requestAction = '';
            return $this->viewThreadObject();
        }

        $oReplyEditForm = $this->getReplyEditForm();

        // remove mandatory fields
        $oReplyEditForm->getItemByPostVar('subject')->setRequired(false);
        $oReplyEditForm->getItemByPostVar('message')->setRequired(false);

        $oReplyEditForm->checkInput();

        // add mandatory fields
        $oReplyEditForm->getItemByPostVar('subject')->setRequired(true);
        $oReplyEditForm->getItemByPostVar('message')->setRequired(true);

        $this->requestAction = 'showreply';

        $this->viewThreadObject();
    }

    public function getQuotationHTMLAsynchObject()
    {
        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $this->ensureThreadBelongsToForum((int) $this->object->getId(), $this->objCurrentPost->getThread());

        $oForumObjects = $this->getForumObjects();
        $frm = $oForumObjects['frm'];

        $authorinfo = new ilForumAuthorInformation(
            $this->objCurrentPost->getPosAuthorId(),
            $this->objCurrentPost->getDisplayUserId(),
            $this->objCurrentPost->getUserAlias(),
            $this->objCurrentPost->getImportName()
        );

        $html = ilRTE::_replaceMediaObjectImageSrc($frm->prepareText(
            $this->objCurrentPost->getMessage(),
            1,
            $authorinfo->getAuthorName()
        ), 1);

        $this->http->saveResponse($this->http->response()->withBody(
            \ILIAS\Filesystem\Stream\Streams::ofString($html)
        ));
        $this->http->sendResponse();
        $this->http->close();
    }

    private function getForumObjects()
    {
        if (null === $this->forumObjects) {
            $forumObj = $this->object;
            $file_obj = new ilFileDataForum($forumObj->getId(), $this->objCurrentPost->getId());
            $frm = $forumObj->Forum;
            $frm->setForumId($forumObj->getId());
            $frm->setForumRefId($forumObj->getRefId());

            $this->forumObjects['forumObj'] = $forumObj;
            $this->forumObjects['frm'] = $frm;
            $this->forumObjects['file_obj'] = $file_obj;
        }

        return $this->forumObjects;
    }

    public function checkUsersViewMode() : void
    {
        $this->selectedSorting = $this->objProperties->getDefaultView();
        
        if (in_array(\ilSession::get('viewmode'), [
            ilForumProperties::VIEW_TREE,
            ilForumProperties::VIEW_DATE_ASC,
            ilForumProperties::VIEW_DATE_DESC
        ])) {
            $this->selectedSorting = \ilSession::get('viewmode');
        }

        if (
            isset($this->httpRequest->getQueryParams()['viewmode']) &&
            (int) $this->httpRequest->getQueryParams()['viewmode'] !== (int) $this->selectedSorting
        ) {
            $this->selectedSorting = (int) $this->httpRequest->getQueryParams()['viewmode'];
        }
    
        if (!in_array($this->selectedSorting, [
                ilForumProperties::VIEW_TREE,
                ilForumProperties::VIEW_DATE_ASC,
                ilForumProperties::VIEW_DATE_DESC
            ])) {
            $this->selectedSorting = $this->objProperties->getDefaultView();
        }
       
        \ilSession::set('viewmode', $this->selectedSorting);
    }

    public function viewThreadObject()
    {
        $bottom_toolbar = clone $this->toolbar;
        $bottom_toolbar_split_button_items = [];

        // quick and dirty: check for treeview
        if (!isset($_SESSION['thread_control']['old'])) {
            $_SESSION['thread_control']['old'] = $_GET['thr_pk'];
            $_SESSION['thread_control']['new'] = $_GET['thr_pk'];
        } else {
            if (isset($_SESSION['thread_control']['old']) && $_GET['thr_pk'] != $_SESSION['thread_control']['old']) {
                $_SESSION['thread_control']['new'] = $_GET['thr_pk'];
            }
        }

        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $pageIndex = 0;
        if (isset($this->httpRequest->getQueryParams()['page'])) {
            $pageIndex = max((int) $this->httpRequest->getQueryParams()['page'], $pageIndex);
        }

        $firstNodeInThread = $this->objCurrentTopic->getFirstPostNode();

        $toolContext = $this->globalScreen
            ->tool()
            ->context()
            ->current();

        $additionalDataExists = $toolContext->getAdditionalData()->exists(ForumGlobalScreenToolsProvider::SHOW_FORUM_THREADS_TOOL);
        if (false === $additionalDataExists && $this->selectedSorting === ilForumProperties::VIEW_TREE) {
            $toolContext
                ->addAdditionalData(ForumGlobalScreenToolsProvider::SHOW_FORUM_THREADS_TOOL, true)
                ->addAdditionalData(ForumGlobalScreenToolsProvider::REF_ID, (int) $this->ref_id)
                ->addAdditionalData(ForumGlobalScreenToolsProvider::FORUM_THEAD, $this->objCurrentTopic)
                ->addAdditionalData(ForumGlobalScreenToolsProvider::FORUM_THREAD_ROOT, $firstNodeInThread)
                ->addAdditionalData(ForumGlobalScreenToolsProvider::FORUM_BASE_CONTROLLER, $this)
                ->addAdditionalData(ForumGlobalScreenToolsProvider::PAGE, $pageIndex);
        }

        $oForumObjects = $this->getForumObjects();
        $forumObj = $oForumObjects['forumObj'];
        $frm = $oForumObjects['frm'];
        $file_obj = $oForumObjects['file_obj'];

        $selected_draft_id = (int) ($this->httpRequest->getQueryParams()['draft_id'] ?? 0);

        if (isset($this->httpRequest->getQueryParams()['file'])) {
            $file_obj_for_delivery = $file_obj;
            if (ilForumPostDraft::isSavePostDraftAllowed() && $selected_draft_id > 0) {
                $file_obj_for_delivery = new ilFileDataForumDrafts($forumObj->getId(), $selected_draft_id);
            }
            $file_obj_for_delivery->deliverFile(\ilUtil::stripSlashes($this->httpRequest->getQueryParams()['file']));
        }

        if (!$this->objCurrentTopic->getId()) {
            $this->ctrl->redirect($this, 'showThreads');
        }

        $this->ensureThreadBelongsToForum((int) $this->object->getId(), $this->objCurrentTopic);

        // Set context for login
        $append = '_' . $this->objCurrentTopic->getId() .
            ($this->objCurrentPost->getId() ? '_' . $this->objCurrentPost->getId() : '');
        $this->tpl->setLoginTargetPar('frm_' . $_GET['ref_id'] . $append);

        // delete temporary media object (not in case a user adds media objects and wants to save an invalid form)
        if (!in_array($this->requestAction, ['showreply', 'showedit'])) {
            try {
                $mobs = ilObjMediaObject::_getMobsOfObject('frm~:html', $this->user->getId());
                foreach ($mobs as $mob) {
                    if (ilObjMediaObject::_exists($mob)) {
                        ilObjMediaObject::_removeUsage($mob, 'frm~:html', $this->user->getId());
                        $mob_obj = new ilObjMediaObject($mob);
                        $mob_obj->delete();
                    }
                }
            } catch (Exception $e) {
            }
        }

        if (!$this->getCreationMode() && $this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->ilNavigationHistory->addItem(
                (int) $this->object->getRefId(),
                \ilLink::_getLink((int) $this->object->getRefId(), 'frm'),
                'frm'
            );
        }

        // save last access
        $forumObj->updateLastAccess($this->user->getId(), (int) $this->objCurrentTopic->getId());

        $this->prepareThreadScreen($forumObj);

        $threadContentTemplate = new \ilTemplate(
            'tpl.forums_threads_view.html',
            true,
            true,
            'Modules/Forum'
        );

        if (isset($this->httpRequest->getQueryParams()['anchor'])) {
            $threadContentTemplate->setVariable('JUMP2ANCHOR_ID', (int) $this->httpRequest->getQueryParams()['anchor']);
        }

        $currentSortation = ilForumProperties::VIEW_DATE_ASC;
        if ($this->selectedSorting == ilForumProperties::VIEW_TREE) {
            $orderField = 'frm_posts_tree.rgt';
            $this->objCurrentTopic->setOrderDirection('DESC');
        } else {
            $orderField = 'frm_posts.pos_date';
            $this->objCurrentTopic->setOrderDirection(
                (int) $this->selectedSorting === ilForumProperties::VIEW_DATE_DESC ? 'DESC' : 'ASC'
            );
        }

        $threadContentTemplate->setVariable('LIST_TYPE', $this->viewModeOptions[$this->selectedSorting]);

        $numberOfPostings = 0;

        // get forum- and thread-data
        $frm->setMDB2WhereCondition('top_frm_fk = %s ', array('integer'), array($frm->getForumId()));

        if ($firstNodeInThread) {
            $this->objCurrentTopic->updateVisits();

            $this->tpl->setTitle($this->lng->txt('forums_thread') . " \"" . $this->objCurrentTopic->getSubject() . "\"");

            $this->locator->addRepositoryItems();
            $this->locator->addItem($this->object->getTitle(), $this->ctrl->getLinkTarget($this, ""), "_top");
            $this->tpl->setLocator();

            if (
                !$this->user->isAnonymous() &&
                $forumObj->getCountUnread($this->user->getId(), (int) $this->objCurrentTopic->getId(), true)
            ) {
                $this->ctrl->setParameter($this, 'mark_read', '1');
                $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentTopic->getId());

                $mark_thr_read_button = ilLinkButton::getInstance();
                $mark_thr_read_button->setCaption('forums_mark_read');
                $mark_thr_read_button->setUrl($this->ctrl->getLinkTarget($this, 'viewThread'));
                $mark_thr_read_button->setAccessKey(ilAccessKey::MARK_ALL_READ);

                $bottom_toolbar_split_button_items[] = $mark_thr_read_button;

                $this->ctrl->clearParameters($this);
            }

            // print thread
            $this->ctrl->setParameterByClass('ilforumexportgui', 'print_thread', $this->objCurrentTopic->getId());
            $this->ctrl->setParameterByClass('ilforumexportgui', 'thr_top_fk', $this->objCurrentTopic->getForumId());

            $print_thr_button = ilLinkButton::getInstance();
            $print_thr_button->setCaption('forums_print_thread');
            $print_thr_button->setUrl($this->ctrl->getLinkTargetByClass('ilforumexportgui', 'printThread'));

            $bottom_toolbar_split_button_items[] = $print_thr_button;

            $this->ctrl->clearParametersByClass('ilforumexportgui');

            $this->addHeaderAction();

            if (isset($this->httpRequest->getQueryParams()['mark_read'])) {
                $forumObj->markThreadRead($this->user->getId(), (int) $this->objCurrentTopic->getId());
                ilUtil::sendInfo($this->lng->txt('forums_thread_marked'), true);
            }

            $this->objCurrentTopic->setOrderField($orderField);
            $subtree_nodes = $this->objCurrentTopic->getPostTree($firstNodeInThread);

            if (!$this->isTopLevelReplyCommand() &&
                $firstNodeInThread instanceof ilForumPost &&
                !$this->objCurrentTopic->isClosed() &&
                $this->access->checkAccess('add_reply', '', (int) $_GET['ref_id'])
            ) {
                $reply_button = ilLinkButton::getInstance();
                $reply_button->setPrimary(true);
                $reply_button->setCaption('add_new_answer');
                $this->ctrl->setParameter($this, 'action', 'showreply');
                $this->ctrl->setParameter($this, 'pos_pk', $firstNodeInThread->getId());
                $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentTopic->getId());
                $this->ctrl->setParameter($this, 'page', (int) $this->httpRequest->getQueryParams()['page']);
                $this->ctrl->setParameter(
                    $this,
                    'orderby',
                    \ilUtil::stripSlashes($this->httpRequest->getQueryParams()['orderby'])
                );

                $reply_button->setUrl($this->ctrl->getLinkTarget($this, 'createTopLevelPost', 'frm_page_bottom'));

                $this->ctrl->clearParameters($this);
                array_unshift($bottom_toolbar_split_button_items, $reply_button);
            }

            // no posts
            if (!$numberOfPostings = count($subtree_nodes)) {
                ilUtil::sendInfo($this->lng->txt('forums_no_posts_available'));
            }

            $pageSize = $frm->getPageHits();
            $postIndex = 0;
            if ($numberOfPostings > $pageSize) {
                $this->ctrl->setParameter($this, 'ref_id', (int) $this->object->getRefId());
                $this->ctrl->setParameter($this, 'thr_pk', (int) $this->objCurrentTopic->getId());
                $this->ctrl->setParameter(
                    $this,
                    'orderby',
                    ilUtil::stripSlashes($this->httpRequest->getQueryParams()['orderby'])
                );
                $paginationUrl = $this->ctrl->getLinkTarget($this, 'viewThread', '', false, false);
                $this->ctrl->clearParameters($this);

                $pagination = $this->uiFactory->viewControl()
                    ->pagination()
                    ->withTargetURL($paginationUrl, 'page')
                    ->withTotalEntries($numberOfPostings)
                    ->withPageSize($pageSize)
                    ->withMaxPaginationButtons(10)
                    ->withCurrentPage($pageIndex);

                $threadContentTemplate->setVariable('THREAD_MENU', $this->uiRenderer->render(
                    $pagination
                ));
                $threadContentTemplate->setVariable('THREAD_MENU_BOTTOM', $this->uiRenderer->render(
                    $pagination
                ));
            }

            $doRenderDrafts = ilForumPostDraft::isSavePostDraftAllowed() && !$this->user->isAnonymous();
            $draftsObjects = [];
            if ($doRenderDrafts) {
                $draftsObjects = ilForumPostDraft::getSortedDrafts(
                    (int) $this->user->getId(),
                    (int) $this->objCurrentTopic->getId(),
                    $this->selectedSorting
                );
            }

            $pagedPostings = array_slice($subtree_nodes, $pageIndex * $pageSize, $pageSize);

            $this->ensureValidPageForCurrentPosting($subtree_nodes, $pagedPostings, $pageSize, $firstNodeInThread);

            if (
                $doRenderDrafts && 0 === $pageIndex &&
                $this->selectedSorting === ilForumProperties::VIEW_DATE_DESC
            ) {
                foreach ($draftsObjects as $draft) {
                    $referencePosting = array_values(array_filter(
                        $subtree_nodes,
                        static function (ilForumPost $post) use ($draft) : bool {
                            return $draft->getPostId() == $post->getId();
                        }
                    ))[0] ?? $firstNodeInThread;

                    $this->renderDraftContent(
                        $threadContentTemplate,
                        $this->requestAction,
                        $referencePosting,
                        [$draft]
                    );
                }
            }

            foreach ($pagedPostings as $node) {
                $this->ctrl->clearParameters($this);

                if (!$this->isTopLevelReplyCommand() && $this->objCurrentPost->getId() == $node->getId()) {
                    if ($this->is_moderator || $node->isActivated() || $node->isOwner($this->user->getId())) {
                        if (!$this->objCurrentTopic->isClosed() && in_array($this->requestAction, [
                                'showreply',
                                'showedit',
                            ])) {
                            $this->renderPostingForm($threadContentTemplate, $frm, $node, $this->requestAction);
                        } elseif (!$this->objCurrentTopic->isClosed() && $this->requestAction === 'censor') {
                            if ($this->is_moderator) {
                                $threadContentTemplate->setVariable('FORM', $this->getCensorshipFormHTML());
                            }
                        } elseif (!$this->objCurrentTopic->isClosed() && $this->displayConfirmPostActivation()) {
                            if ($this->is_moderator) {
                                $threadContentTemplate->setVariable('FORM', $this->getActivationFormHTML());
                            }
                        }
                    }
                }

                $this->renderPostContent($threadContentTemplate, $node, $this->requestAction, $pageIndex, $postIndex);
                if ($doRenderDrafts && $this->selectedSorting === ilForumProperties::VIEW_TREE) {
                    $this->renderDraftContent(
                        $threadContentTemplate,
                        $this->requestAction,
                        $node,
                        $draftsObjects[$node->getId()] ?? []
                    );
                }

                $postIndex++;
            }

            if (
                $this->selectedSorting === ilForumProperties::VIEW_DATE_ASC &&
                $doRenderDrafts && $pageIndex === max(0, (int) (ceil($numberOfPostings / $pageSize) - 1))
            ) {
                foreach ($draftsObjects as $draft) {
                    $referencePosting = array_values(array_filter(
                        $subtree_nodes,
                        static function (ilForumPost $post) use ($draft) : bool {
                            return $draft->getPostId() == $post->getId();
                        }
                    ))[0] ?? $firstNodeInThread;

                    $this->renderDraftContent(
                        $threadContentTemplate,
                        $this->requestAction,
                        $referencePosting,
                        [$draft]
                    );
                }
            }

            if (
                $firstNodeInThread instanceof ilForumPost && $doRenderDrafts &&
                $this->selectedSorting === ilForumProperties::VIEW_TREE
            ) {
                $this->renderDraftContent(
                    $threadContentTemplate,
                    $this->requestAction,
                    $firstNodeInThread,
                    $draftsObjects[$firstNodeInThread->getId()] ?? []
                );
            }

            if (
                $firstNodeInThread instanceof ilForumPost &&
                in_array($this->ctrl->getCmd(), array('createTopLevelPost', 'saveTopLevelPost', 'saveTopLevelDraft')) &&
                !$this->objCurrentTopic->isClosed() &&
                $this->access->checkAccess('add_reply', '', (int) $_GET['ref_id'])) {
                // Important: Don't separate the following two lines (very fragile code ...)
                $this->objCurrentPost->setId($firstNodeInThread->getId());
                $form = $this->getReplyEditForm();

                if (in_array($this->ctrl->getCmd(), ['saveTopLevelPost', 'saveTopLevelDraft'])) {
                    $form->setValuesByPost();
                }
                $this->ctrl->setParameter($this, 'pos_pk', $firstNodeInThread->getId());
                $this->ctrl->setParameter($this, 'thr_pk', $firstNodeInThread->getThreadId());
                $jsTpl = new ilTemplate('tpl.forum_post_quoation_ajax_handler.html', true, true, 'Modules/Forum');
                $jsTpl->setVariable(
                    'IL_FRM_QUOTE_CALLBACK_SRC',
                    $this->ctrl->getLinkTarget($this, 'getQuotationHTMLAsynch', '', true)
                );
                $this->ctrl->clearParameters($this);
                $threadContentTemplate->setVariable('BOTTOM_FORM_ADDITIONAL_JS', $jsTpl->get());
                $threadContentTemplate->setVariable('BOTTOM_FORM', $form->getHTML());
            }
        } else {
            $threadContentTemplate->setCurrentBlock('posts_no');
            $threadContentTemplate->setVariable(
                'TXT_MSG_NO_POSTS_AVAILABLE',
                $this->lng->txt('forums_posts_not_available')
            );
            $threadContentTemplate->parseCurrentBlock();
        }

        if ($bottom_toolbar_split_button_items) {
            $bottom_split_button = ilSplitButtonGUI::getInstance();
            $i = 0;
            foreach ($bottom_toolbar_split_button_items as $item) {
                if ($i == 0) {
                    $bottom_split_button->setDefaultButton($item);
                } else {
                    $bottom_split_button->addMenuItem(new ilButtonToSplitButtonMenuItemAdapter($item));
                }

                ++$i;
            }
            $bottom_toolbar->addStickyItem($bottom_split_button);
            $this->toolbar->addStickyItem($bottom_split_button);
        }

        if ($bottom_toolbar_split_button_items) {
            $bottom_toolbar->addSeparator();
        }

        $to_top_button = ilLinkButton::getInstance();
        $to_top_button->setCaption('top_of_page');
        $to_top_button->setUrl('#frm_page_top');
        $bottom_toolbar->addButtonInstance($to_top_button);
        if ($numberOfPostings > 0) {
            $threadContentTemplate->setVariable('TOOLBAR_BOTTOM', $bottom_toolbar->getHTML());
        }

        $this->renderViewModeControl($this->selectedSorting);
        if ($this->selectedSorting != ilForumProperties::VIEW_TREE) {
            $this->renderSortationControl($this->selectedSorting);
        }

        $this->tpl->setPermanentLink(
            $this->object->getType(),
            $this->object->getRefId(),
            '_' . $this->objCurrentTopic->getId(),
            '_top'
        );

        $this->tpl->addOnLoadCode('$(".ilFrmPostContent img").each(function() {
                        var $elm = $(this);
                        $elm.css({
                                maxWidth: $elm.attr("width") + "px", 
                                maxHeight: $elm.attr("height")  + "px"
                        });
                        $elm.removeAttr("width");
                        $elm.removeAttr("height");
                });');

        $this->tpl->setContent($threadContentTemplate->get() . $this->getModalActions());

        return true;
    }

    private function renderViewModeControl(int $currentViewMode) : void
    {
        $translationKeys = [];
        foreach ($this->viewModeOptions as $sortingConstantKey => $languageKey) {
            $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentTopic->getId());
            $this->ctrl->setParameter($this, 'pos_pk', $this->objCurrentPost->getId());
            $this->ctrl->setParameter($this, 'viewmode', $sortingConstantKey);

            $translationKeys[$this->lng->txt($languageKey)] = $this->ctrl->getLinkTarget(
                $this,
                'viewThread',
                '',
                false,
                false
            );

            $this->ctrl->clearParameters($this);
        }

        if ($currentViewMode > ilForumProperties::VIEW_DATE_ASC) {
            $currentViewMode = ilForumProperties::VIEW_DATE_ASC;
        }

        $sortViewControl = $this->uiFactory
            ->viewControl()
            ->mode($translationKeys, $this->lng->txt($this->viewModeOptions[$currentViewMode]))
            ->withActive($this->lng->txt($this->viewModeOptions[$currentViewMode]));
        $this->toolbar->addComponent($sortViewControl);
    }

    private function renderSortationControl(int $currentSorting) : void
    {
        $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentTopic->getId());
        $this->ctrl->setParameter($this, 'pos_pk', $this->objCurrentPost->getId());
        $target = $this->ctrl->getLinkTarget(
            $this,
            'viewThread',
            '',
            false,
            false
        );

        $translatedSortationOptions = array_map(function ($value) {
            return $this->lng->txt($value);
        }, $this->sortationOptions);

        $sortingDirectionViewControl = $this->uiFactory
            ->viewControl()
            ->sortation($translatedSortationOptions)
            ->withLabel($this->lng->txt($this->sortationOptions[$currentSorting]))
            ->withTargetURL($target, 'viewmode');
        $this->toolbar->addComponent($sortingDirectionViewControl);
    }

    private function getModifiedReOnSubject($on_reply = false)
    {
        $subject = $this->objCurrentPost->getSubject();
        $re_txt = $this->lng->txt('post_reply');

        $re_txt_with_num = str_replace(':', '(', $re_txt);
        $search_length = strlen($re_txt_with_num);
        $comp = substr_compare($re_txt_with_num, substr($subject, 0, $search_length), 0, $search_length);

        if ($comp == 0) {
            $modified_subject = $subject;
            if ($on_reply == true) {
                // i.e. $subject = "Re(12):"
                $str_pos_start = strpos($subject, '(');
                $str_pos_end = strpos($subject, ')');

                $length = ((int) $str_pos_end - (int) $str_pos_start);
                $str_pos_start++;
                $txt_number = substr($subject, $str_pos_start, $length - 1);

                if (is_numeric($txt_number)) {
                    $re_count = (int) $txt_number + 1;
                    $modified_subject = substr($subject, 0, $str_pos_start) . $re_count . substr(
                        $subject,
                        $str_pos_end
                    );
                }
            }
        } else {
            $re_count = substr_count($subject, $re_txt);
            if ($re_count >= 1 && $on_reply == true) {
                $subject = str_replace($re_txt, '', $subject);

                // i.e. $subject = "Re: Re: Re: ... " -> "Re(4):"
                $re_count++;
                $modified_subject = sprintf($this->lng->txt('post_reply_count'), $re_count) . ' ' . trim($subject);
            } elseif ($re_count >= 1 && $on_reply == false) {
                // possibility to modify the subject only for output
                // i.e. $subject = "Re: Re: Re: ... " -> "Re(3):"
                $modified_subject = sprintf($this->lng->txt('post_reply_count'), $re_count) . ' ' . trim($subject);
            } elseif ($re_count == 0) {
                // the first reply to a thread
                $modified_subject = $this->lng->txt('post_reply') . ' ' . $this->objCurrentPost->getSubject();
            }
        }
        return $modified_subject;
    }

    public function showUserObject()
    {
        $profile_gui = new ilPublicUserProfileGUI((int) $_GET['user']);
        $add = $this->getUserProfileAdditional((int) $_GET['ref_id'], (int) $_GET['user']);
        $profile_gui->setAdditional($add);
        $profile_gui->setBackUrl(\ilUtil::stripSlashes($_GET['backurl']));
        $this->tpl->setContent($this->ctrl->getHTML($profile_gui));
    }

    protected function getUserProfileAdditional($a_forum_ref_id, $a_user_id)
    {
        if (!$this->access->checkAccess('read', '', $a_forum_ref_id)) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $ref_obj = ilObjectFactory::getInstanceByRefId($a_forum_ref_id);
        if ($ref_obj->getType() == 'frm') {
            $forumObj = new ilObjForum($a_forum_ref_id);
            $frm = $forumObj->Forum;
            $frm->setForumId($forumObj->getId());
            $frm->setForumRefId($forumObj->getRefId());
        } else {
            $frm = new ilForum();
        }

        // count articles of user
        if ($this->access->checkAccess('moderate_frm', '', $a_forum_ref_id)) {
            $numPosts = $frm->countUserArticles(addslashes($a_user_id));
        } else {
            $numPosts = $frm->countActiveUserArticles(addslashes($a_user_id));
        }

        return array($this->lng->txt('forums_posts') => $numPosts);
    }

    public function performThreadsActionObject()
    {
        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        unset($_SESSION['threads2move']);

        if (isset($_POST['thread_ids']) && is_array($_POST['thread_ids'])) {
            if (isset($_POST['selected_cmd']) && $_POST['selected_cmd'] == 'move') {
                if ($this->is_moderator) {
                    $_SESSION['threads2move'] = $_POST['thread_ids'];
                    $this->moveThreadsObject();
                }
            } elseif ($_POST['selected_cmd'] == 'enable_notifications' && $this->settings->get('forum_notification') != 0) {
                for ($i = 0; $i < count($_POST['thread_ids']); $i++) {
                    $tmp_obj = new ilForumTopic($_POST['thread_ids'][$i]);
                    $this->ensureThreadBelongsToForum((int) $this->object->getId(), $tmp_obj);
                    $tmp_obj->enableNotification($this->user->getId());
                }

                $this->ctrl->redirect($this, 'showThreads');
            } elseif ($_POST['selected_cmd'] == 'disable_notifications' && $this->settings->get('forum_notification') != 0) {
                for ($i = 0; $i < count($_POST['thread_ids']); $i++) {
                    $tmp_obj = new ilForumTopic($_POST['thread_ids'][$i]);
                    $this->ensureThreadBelongsToForum((int) $this->object->getId(), $tmp_obj);
                    $tmp_obj->disableNotification($this->user->getId());
                }

                $this->ctrl->redirect($this, 'showThreads');
            } elseif ($_POST['selected_cmd'] == 'close') {
                if ($this->is_moderator) {
                    for ($i = 0; $i < count($_POST['thread_ids']); $i++) {
                        $tmp_obj = new ilForumTopic($_POST['thread_ids'][$i]);
                        $this->ensureThreadBelongsToForum((int) $this->object->getId(), $tmp_obj);
                        $tmp_obj->close();
                    }
                }
                ilUtil::sendSuccess($this->lng->txt('selected_threads_closed'), true);
                $this->ctrl->redirect($this, 'showThreads');
            } elseif ($_POST['selected_cmd'] == 'reopen') {
                if ($this->is_moderator) {
                    for ($i = 0; $i < count($_POST['thread_ids']); $i++) {
                        $tmp_obj = new ilForumTopic($_POST['thread_ids'][$i]);
                        $this->ensureThreadBelongsToForum((int) $this->object->getId(), $tmp_obj);
                        $tmp_obj->reopen();
                    }
                }

                ilUtil::sendSuccess($this->lng->txt('selected_threads_reopened'), true);
                $this->ctrl->redirect($this, 'showThreads');
            } elseif ($_POST['selected_cmd'] == 'makesticky') {
                if ($this->is_moderator) {
                    $message = $this->lng->txt('sel_threads_make_sticky');

                    for ($i = 0; $i < count($_POST['thread_ids']); $i++) {
                        $tmp_obj = new ilForumTopic($_POST['thread_ids'][$i]);
                        $this->ensureThreadBelongsToForum((int) $this->object->getId(), $tmp_obj);
                        $makeSticky = $tmp_obj->makeSticky();

                        if (!$makeSticky) {
                            $message = $this->lng->txt('sel_threads_already_sticky');
                        }
                    }
                }
                if ($message != null) {
                    ilUtil::sendInfo($message, true);
                }
                $this->ctrl->redirect($this, 'showThreads');
            } elseif ($_POST['selected_cmd'] == 'unmakesticky') {
                if ($this->is_moderator) {
                    $message = $this->lng->txt('sel_threads_make_unsticky');
                    for ($i = 0; $i < count($_POST['thread_ids']); $i++) {
                        $tmp_obj = new ilForumTopic($_POST['thread_ids'][$i]);
                        $this->ensureThreadBelongsToForum((int) $this->object->getId(), $tmp_obj);
                        $unmakeSticky = $tmp_obj->unmakeSticky();
                        if (!$unmakeSticky) {
                            $message = $this->lng->txt('sel_threads_already_unsticky');
                        }
                    }
                }

                if ($message != null) {
                    ilUtil::sendInfo($message, true);
                }
                $this->ctrl->redirect($this, 'showThreads');
            } elseif ($_POST['selected_cmd'] == 'editThread') {
                if ($this->is_moderator) {
                    $count = count($_POST['thread_ids']);
                    if ($count != 1) {
                        ilUtil::sendInfo($this->lng->txt('select_max_one_thread'), true);
                        $this->ctrl->redirect($this, 'showThreads');
                    } else {
                        foreach ($_POST['thread_ids'] as $thread_id) {
                            return $this->editThreadObject($thread_id, null);
                        }
                    }
                }

                $this->ctrl->redirect($this, 'showThreads');
            } elseif ($_POST['selected_cmd'] == 'html') {
                $this->ctrl->setCmd('exportHTML');
                $this->ctrl->setCmdClass('ilForumExportGUI');
                $this->executeCommand();
            } elseif ($_POST['selected_cmd'] == 'confirmDeleteThreads') {
                $this->confirmDeleteThreads();
            } elseif ($_POST['selected_cmd'] == 'merge') {
                $this->mergeThreadsObject();
            } else {
                ilUtil::sendInfo($this->lng->txt('topics_please_select_one_action'), true);
                $this->ctrl->redirect($this, 'showThreads');
            }
        } else {
            ilUtil::sendInfo($this->lng->txt('select_at_least_one_thread'), true);
            $this->ctrl->redirect($this, 'showThreads');
        }
    }

    public function performMoveThreadsObject()
    {
        if (!$this->is_moderator) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }


        $threads2move = $_SESSION['threads2move'];
        if (!is_array($threads2move) || !count($threads2move)) {
            ilUtil::sendInfo($this->lng->txt('select_at_least_one_thread'), true);
            $this->ctrl->redirect($this, 'showThreads');
        }

        if (!$this->access->checkAccess('read', '', (int) $_POST['frm_ref_id'])) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $threads = [];
        array_walk($threads2move, function ($threadId) use (&$threads) {
            $thread = new \ilForumTopic($threadId);
            $this->ensureThreadBelongsToForum((int) $this->object->getId(), $thread);

            $threads[] = $threadId;
        });

        if (isset($_POST['frm_ref_id']) && (int) $_POST['frm_ref_id']) {
            $errorMessages = $this->object->Forum->moveThreads(
                (array) $_SESSION['threads2move'],
                $this->object->getRefId(),
                $this->ilObjDataCache->lookupObjId($_POST['frm_ref_id'])
            );

            if (array() !== $errorMessages) {
                \ilUtil::sendFailure(
                    implode("<br><br>", $errorMessages),
                    true
                );
                return $this->ctrl->redirectByClass('ilObjForumGUI', 'showThreads');
            }

            unset($_SESSION['threads2move']);
            ilUtil::sendInfo($this->lng->txt('threads_moved_successfully'), true);
            $this->ctrl->redirect($this, 'showThreads');
        } else {
            ilUtil::sendInfo($this->lng->txt('no_forum_selected'));
            $this->moveThreadsObject();
        }
    }

    public function cancelMoveThreadsObject()
    {
        unset($_SESSION['threads2move']);
        $this->ctrl->redirect($this, 'showThreads');
    }

    public function moveThreadsObject()
    {
        if (!$this->is_moderator) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $threads2move = $_SESSION['threads2move'];
        if (!is_array($threads2move) || !count($threads2move)) {
            ilUtil::sendInfo($this->lng->txt('select_at_least_one_thread'), true);
            $this->ctrl->redirect($this, 'showThreads');
        }

        $threads = [];
        $isModerator = $this->is_moderator;
        array_walk($threads2move, function ($threadId) use (&$threads, $isModerator) {
            $thread = new \ilForumTopic($threadId, $isModerator);
            $this->ensureThreadBelongsToForum((int) $this->object->getId(), $thread);

            $threads[] = $thread;
        });

        $exp = new ilForumMoveTopicsExplorer($this, 'moveThreads');
        $exp->setPathOpen($this->object->getRefId());
        $exp->setNodeSelected(isset($_POST['frm_ref_id']) && (int) $_POST['frm_ref_id'] ? (int) $_POST['frm_ref_id'] : 0);
        $exp->setCurrentFrmRefId($this->object->getRefId());
        $exp->setHighlightedNode($this->object->getRefId());
        if (!$exp->handleCommand()) {
            $moveThreadTemplate = new ilTemplate(
                'tpl.forums_threads_move.html',
                true,
                true,
                'Modules/Forum'
            );

            if (!$this->hideToolbar()) {
                $this->toolbar->addButton($this->lng->txt('back'), $this->ctrl->getLinkTarget($this));
            }

            $tblThr = new ilTable2GUI($this);
            $tblThr->setId('il_frm_thread_move_table_' . $this->object->getRefId());
            $tblThr->setTitle($this->lng->txt('move_chosen_topics'));
            $tblThr->addColumn($this->lng->txt('subject'), 'top_name', '100%');
            $tblThr->disable('header');
            $tblThr->disable('footer');
            $tblThr->disable('linkbar');
            $tblThr->disable('sort');
            $tblThr->disable('linkbar');
            $tblThr->setLimit(PHP_INT_MAX);
            $tblThr->setRowTemplate('tpl.forums_threads_move_thr_row.html', 'Modules/Forum');
            $tblThr->setDefaultOrderField('is_sticky');
            $counter = 0;
            $result = array();
            foreach ($threads as $thread) {
                $result[$counter]['num'] = $counter + 1;
                $result[$counter]['thr_subject'] = $thread->getSubject();
                ++$counter;
            }
            $tblThr->setData($result);
            $moveThreadTemplate->setVariable('THREADS_TABLE', $tblThr->getHTML());

            $moveThreadTemplate->setVariable('FRM_SELECTION_TREE', $exp->getHTML());
            $moveThreadTemplate->setVariable('CMD_SUBMIT', 'performMoveThreads');
            $moveThreadTemplate->setVariable('TXT_SUBMIT', $this->lng->txt('move'));
            $moveThreadTemplate->setVariable('FORMACTION', $this->ctrl->getFormAction($this, 'performMoveThreads'));

            $this->tpl->setContent($moveThreadTemplate->get());
        }

        return true;
    }

    private function isWritingWithPseudonymAllowed() : bool
    {
        if ($this->objProperties->isAnonymized() && (!$this->is_moderator || !$this->objProperties->getMarkModeratorPosts())) {
            return true;
        }
        return false;
    }

    protected function deleteThreadDraftsObject()
    {
        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $draftIds = array_filter((array) ($this->httpRequest->getParsedBody()['draft_ids'] ?? []));
        if (0 === count($draftIds)) {
            $draftIds = array_filter([(int) ($this->httpRequest->getQueryParams()['draft_id'] ?? 0)]);
        }

        $instances = \ilForumPostDraft::getDraftInstancesByUserId($this->user->getId());
        $checkedDraftIds = [];
        foreach ($draftIds as $draftId) {
            if (array_key_exists($draftId, $instances)) {
                $checkedDraftIds[] = $draftId;
                $draft = $instances[$draftId];

                $this->deleteMobsOfDraft($draft->getDraftId(), $draft->getPostMessage());

                $draftFileData = new \ilFileDataForumDrafts(0, $draft->getDraftId());
                $draftFileData->delete();

                $GLOBALS['ilAppEventHandler']->raise(
                    'Modules/Forum',
                    'deletedDraft',
                    [
                    'draftObj' => $draft,
                    'obj_id' => $this->object->getId(),
                    'is_file_upload_allowed' => $this->objProperties->isFileUploadAllowed(),
                ]
                );

                $draft->deleteDraft();
            }
        }

        if (count($checkedDraftIds) > 1) {
            \ilUtil::sendInfo($this->lng->txt('delete_drafts_successfully'), true);
        } else {
            \ilUtil::sendInfo($this->lng->txt('delete_draft_successfully'), true);
        }
        $this->ctrl->redirect($this, 'showThreads');
    }

    private function buildThreadForm($isDraft = false) : \ilPropertyFormGUI
    {
        $draftId = (int) ($this->httpRequest->getQueryParams()['draft_id'] ?? 0);
        $allowNotification = !$this->objProperties->isAnonymized();

        $mail = new \ilMail($this->user->getId());
        if (!$this->rbac->system()->checkAccess('internal_mail', $mail->getMailObjectReferenceId())) {
            $allowNotification = false;
        }

        $form = new \ilForumThreadFormGUI(
            $this,
            $this->objProperties,
            $this->isWritingWithPseudonymAllowed(),
            $allowNotification,
            $isDraft,
            $draftId
        );

        $this->decorateWithAutosave($form);

        return $form;
    }

    protected function createThreadObject()
    {
        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        if (!$this->access->checkAccess('add_thread', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $templateForWidthHandling = new \ilTemplate('tpl.create_thread_form.html', true, true, 'Modules/Forum');
        $templateForWidthHandling->setVariable('CREATE_FORM', $this->buildThreadForm()->getHTML());
        $templateForWidthHandling->parseCurrentBlock();

        $this->tpl->setContent($templateForWidthHandling->get());
    }

    private function createThread(\ilForumPostDraft $draft, bool $createFromDraft = false)
    {
        if (
            !$this->access->checkAccess('add_thread', '', $this->object->getRefId()) ||
            !$this->access->checkAccess('read', '', $this->object->getRefId())
        ) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $frm = $this->object->Forum;
        $frm->setForumId($this->object->getId());
        $frm->setForumRefId($this->object->getRefId());
        $frm->setMDB2WhereCondition('top_frm_fk = %s ', array('integer'), array($frm->getForumId()));
        $topicData = $frm->getOneTopic();

        $form = $this->buildThreadForm($createFromDraft);
        if ($form->checkInput()) {
            $this->doCaptchaCheck();

            $userIdForDisplayPurposes = $this->user->getId();
            if ($this->isWritingWithPseudonymAllowed()) {
                $userIdForDisplayPurposes = 0;
            }

            $status = 1;
            if (
                ($this->objProperties->isPostActivationEnabled() && !$this->is_moderator) ||
                $this->objCurrentPost->isAnyParentDeactivated()
            ) {
                $status = 0;
            }

            if ($createFromDraft) {
                $newThread = new \ilForumTopic(0, true, true);
                $newThread->setForumId($topicData['top_pk']);
                $newThread->setThrAuthorId($draft->getPostAuthorId());
                $newThread->setDisplayUserId($draft->getPostDisplayUserId());
                $newThread->setSubject($this->handleFormInput($form->getInput('subject'), false));
                $newThread->setUserAlias($draft->getPostUserAlias());

                $newPost = $frm->generateThread(
                    $newThread,
                    \ilRTE::_replaceMediaObjectImageSrc($form->getInput('message'), 0),
                    $draft->getNotify(),
                    $draft->getPostNotify(),
                    $status
                );
            } else {
                $userAlias = \ilForumUtil::getPublicUserAlias(
                    $form->getInput('alias'),
                    $this->objProperties->isAnonymized()
                );
                $newThread = new \ilForumTopic(0, true, true);
                $newThread->setForumId($topicData['top_pk']);
                $newThread->setThrAuthorId($this->user->getId());
                $newThread->setDisplayUserId($userIdForDisplayPurposes);
                $newThread->setSubject($this->handleFormInput($form->getInput('subject'), false));
                $newThread->setUserAlias($userAlias);

                $newPost = $frm->generateThread(
                    $newThread,
                    \ilRTE::_replaceMediaObjectImageSrc($form->getInput('message'), 0),
                    $form->getItemByPostVar('notify') ? (int) $form->getInput('notify') : 0,
                    0, // #19980
                    $status
                );
            }

            if ($this->objProperties->isFileUploadAllowed()) {
                $file = $_FILES['userfile'];
                if (is_array($file) && !empty($file)) {
                    $fileData = new \ilFileDataForum($this->object->getId(), $newPost);
                    $fileData->storeUploadedFile($file);
                }
            }

            $frm->setDbTable('frm_data');
            $frm->setMDB2WhereCondition('top_pk = %s ', array('integer'), array($topicData['top_pk']));
            $frm->updateVisits($topicData['top_pk']);

            if ($createFromDraft) {
                $mediaObjects = \ilObjMediaObject::_getMobsOfObject('frm~:html', $this->user->getId());
            } else {
                $mediaObjects = \ilRTE::_getMediaObjects($form->getInput('message'), 0);
            }
            foreach ($mediaObjects as $mob) {
                if (\ilObjMediaObject::_exists($mob)) {
                    \ilObjMediaObject::_removeUsage($mob, 'frm~:html', $this->user->getId());
                    \ilObjMediaObject::_saveUsage($mob, 'frm:html', $newPost);
                }
            }

            if ($draft->getDraftId() > 0) {
                $draftHistory = new \ilForumDraftsHistory();
                $draftHistory->deleteHistoryByDraftIds([$draft->getDraftId()]);
                if ($this->objProperties->isFileUploadAllowed()) {
                    $forumFileData = new \ilFileDataForum($this->object->getId(), $newPost);
                    $draftFileData = new \ilFileDataForumDrafts($this->object->getId(), $draft->getDraftId());
                    $draftFileData->moveFilesOfDraft($forumFileData->getForumPath(), $newPost);
                }
                $draft->deleteDraft();
            }

            $GLOBALS['ilAppEventHandler']->raise(
                'Modules/Forum',
                'createdPost',
                [
                'ref_id' => $this->object->getRefId(),
                'post' => new \ilForumPost($newPost),
                'notify_moderators' => !$status
            ]
            );

            \ilUtil::sendSuccess($this->lng->txt('forums_thread_new_entry'), true);
            $this->ctrl->redirect($this);
        }

        $form->setValuesByPost();
        if (!$this->objProperties->isAnonymized()) {
            $form->getItemByPostVar('alias')->setValue($this->user->getLogin());
        }

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

    protected function publishThreadDraftObject()
    {
        if (!ilForumPostDraft::isSavePostDraftAllowed()) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $draftId = (int) ($this->httpRequest->getQueryParams()['draft_id'] ?? 0);
        $draft = \ilForumPostDraft::newInstanceByDraftId($draftId);

        if ((int) $draft->getDraftId() <= 0) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $this->createThread($draft, true);
    }

    protected function addThreadObject()
    {
        $draft = new \ilForumPostDraft();
        if (\ilForumPostDraft::isSavePostDraftAllowed()) {
            $draftId = (int) ($this->httpRequest->getParsedBody()['draft_id'] ?? 0);
            if ($draftId > 0) {
                $draft = \ilForumPostDraft::newInstanceByDraftId($draftId);
            }
        }

        $this->createThread($draft, false);
    }

    protected function enableForumNotificationObject()
    {
        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $frm = $this->object->Forum;
        $frm->setForumId($this->object->getId());
        $frm->enableForumNotification($this->user->getId());

        if ((int) $this->objCurrentTopic->getId() > 0) {
            $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentTopic->getId());
            \ilUtil::sendInfo($this->lng->txt('forums_forum_notification_enabled'), true);
            $this->ctrl->redirect($this, 'viewThread');
        }

        \ilUtil::sendInfo($this->lng->txt('forums_forum_notification_enabled'));
        $this->showThreadsObject();
    }

    protected function disableForumNotificationObject()
    {
        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $frm = $this->object->Forum;
        $frm->setForumId($this->object->getId());
        $frm->disableForumNotification($this->user->getId());

        if ((int) $this->objCurrentTopic->getId() > 0) {
            $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentTopic->getId());
            \ilUtil::sendInfo($this->lng->txt('forums_forum_notification_disabled'), true);
            $this->ctrl->redirect($this, 'viewThread');
        }

        \ilUtil::sendInfo($this->lng->txt('forums_forum_notification_disabled'));
        $this->showThreadsObject();
    }

    protected function setColumnSettings(ilColumnGUI $column_gui)
    {
        $column_gui->setBlockProperty('news', 'title', $this->lng->txt('frm_latest_postings'));
        $column_gui->setBlockProperty('news', 'prevent_aggregation', true);
        $column_gui->setRepositoryMode(true);

        if ($this->access->checkAccess('write', '', $this->object->getRefId())) {
            $news_set = new \ilSetting('news');
            if ($news_set->get('enable_rss_for_internal')) {
                $column_gui->setBlockProperty('news', 'settings', true);
                $column_gui->setBlockProperty('news', 'public_notifications_option', true);
            }
        }
    }

    protected function addLocatorItems()
    {
        if ($this->object instanceof \ilObjForum) {
            $this->locator->addItem(
                $this->object->getTitle(),
                $this->ctrl->getLinkTarget($this),
                '',
                $this->object->getRefId()
            );
        }
    }

    public function handleFormInput($a_text, $a_stripslashes = true)
    {
        $a_text = str_replace("<", "&lt;", $a_text);
        $a_text = str_replace(">", "&gt;", $a_text);
        if ($a_stripslashes) {
            $a_text = ilUtil::stripSlashes($a_text);
        }

        return $a_text;
    }

    public function prepareFormOutput($a_text)
    {
        $a_text = str_replace("&lt;", "<", $a_text);
        $a_text = str_replace("&gt;", ">", $a_text);
        $a_text = ilUtil::prepareFormOutput($a_text);
        return $a_text;
    }

    protected function infoScreen()
    {
        if (
            !$this->access->checkAccess('visible', '', $this->object->getRefId()) &&
            !$this->access->checkAccess('read', '', $this->object->getRefId())
        ) {
            $this->error->raiseError($this->lng->txt('msg_no_perm_read'), $this->error->MESSAGE);
        }

        $info = new \ilInfoScreenGUI($this);
        $info->enablePrivateNotes();
        $info->addMetaDataSections($this->object->getId(), 0, $this->object->getType());
        $this->ctrl->forwardCommand($info);
    }

    protected function markPostUnreadObject()
    {
        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        if ((int) $this->objCurrentPost->getId() > 0) {
            $this->ensureThreadBelongsToForum((int) $this->object->getId(), $this->objCurrentPost->getThread());

            $this->object->markPostUnread($this->user->getId(), (int) $this->objCurrentPost->getId());
        }
        $this->viewThreadObject();
    }

    protected function markPostReadObject()
    {
        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        if ((int) $this->objCurrentTopic->getId() > 0 && (int) $this->objCurrentPost->getId() > 0) {
            $this->ensureThreadBelongsToForum((int) $this->object->getId(), $this->objCurrentPost->getThread());

            $this->object->markPostRead(
                $this->user->getId(),
                (int) $this->objCurrentTopic->getId(),
                (int) $this->objCurrentPost->getId()
            );
        }
        $this->viewThreadObject();
    }

    protected function initHeaderAction($a_sub_type = null, $a_sub_id = null)
    {
        $lg = parent::initHeaderAction();

        if ((int) $this->objCurrentTopic->getId() > 0) {
            $container_obj = null; // Workaround: Do not show "desktop actions" in thread view
            $lg->setContainerObject($container_obj);
        }

        if (!($lg instanceof \ilObjForumListGUI) || !$this->settings->get('forum_notification')) {
            return $lg;
        }

        if ($this->user->isAnonymous() || !$this->access->checkAccess('read', '', $this->object->getRefId())) {
            return $lg;
        }

        $frm = $this->object->Forum;
        $frm->setForumId($this->object->getId());
        $frm->setForumRefId($this->object->getRefId());
        $frm->setMDB2Wherecondition('top_frm_fk = %s ', array('integer'), array($frm->getForumId()));

        $isForumNotificationEnabled = $frm->isForumNotificationEnabled($this->user->getId());
        $userMayDisableNotifications = $this->isUserAllowedToDeactivateNotification();

        if ((int) $this->objCurrentTopic->getId() > 0) {
            $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentTopic->getId());
        }

        if ($this->isParentObjectCrsOrGrp()) {
            // special behaviour for CRS/GRP-Forum notification!!
            if ($isForumNotificationEnabled && $userMayDisableNotifications) {
                $lg->addCustomCommand(
                    $this->ctrl->getLinkTarget($this, 'disableForumNotification'),
                    'forums_disable_forum_notification'
                );
            } elseif (!$isForumNotificationEnabled) {
                $lg->addCustomCommand(
                    $this->ctrl->getLinkTarget($this, 'enableForumNotification'),
                    'forums_enable_forum_notification'
                );
            }
        } elseif ($isForumNotificationEnabled) {
            $lg->addCustomCommand(
                $this->ctrl->getLinkTarget($this, 'disableForumNotification'),
                'forums_disable_forum_notification'
            );
        } else {
            $lg->addCustomCommand(
                $this->ctrl->getLinkTarget($this, 'enableForumNotification'),
                'forums_enable_forum_notification'
            );
        }

        $isThreadNotificationEnabled = false;
        if ((int) $this->objCurrentTopic->getId() > 0) {
            $isThreadNotificationEnabled = $this->objCurrentTopic->isNotificationEnabled($this->user->getId());
            if ($isThreadNotificationEnabled) {
                $lg->addCustomCommand(
                    $this->ctrl->getLinkTarget($this, 'toggleThreadNotification'),
                    'forums_disable_notification'
                );
            } else {
                $lg->addCustomCommand(
                    $this->ctrl->getLinkTarget($this, 'toggleThreadNotification'),
                    'forums_enable_notification'
                );
            }
        }
        $this->ctrl->setParameter($this, 'thr_pk', '');

        if ($isForumNotificationEnabled || $isThreadNotificationEnabled) {
            $lg->addHeaderIcon(
                'not_icon',
                ilUtil::getImagePath('notification_on.svg'),
                $this->lng->txt('frm_notification_activated')
            );
        } else {
            $lg->addHeaderIcon(
                'not_icon',
                ilUtil::getImagePath('notification_off.svg'),
                $this->lng->txt('frm_notification_deactivated')
            );
        }

        return $lg;
    }

    public function isUserAllowedToDeactivateNotification()
    {
        if ($this->objProperties->getNotificationType() == 'default') {
            return true;
        }

        if ($this->objProperties->isUserToggleNoti() == 0) {
            return true;
        }

        if ($this->isParentObjectCrsOrGrp()) {
            $frm_noti = new ilForumNotification((int) $_GET['ref_id']);
            $frm_noti->setUserId($this->user->getId());

            $user_toggle = (int) $frm_noti->isUserToggleNotification();
            if ($user_toggle == 0 && $this->objProperties->isUserToggleNoti() == 0) {
                return true;
            }
        }

        return false;
    }

    public function isParentObjectCrsOrGrp() : bool
    {
        $grpRefId = $this->repositoryTree->checkForParentType($this->object->getRefId(), 'grp');
        $crsRefId = $this->repositoryTree->checkForParentType($this->object->getRefId(), 'crs');

        return ($grpRefId > 0 || $crsRefId > 0);
    }

    protected function saveThreadSortingObject()
    {
        if (!$this->is_moderator) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $threadIdToSortValueMap = (array) ($this->httpRequest->getParsedBody()['thread_sorting'] ?? []);

        array_walk($threadIdToSortValueMap, function ($sortValue, $threadId) {
            $this->ensureThreadBelongsToForum((int) $this->object->getId(), new \ilForumTopic($threadId));
        });

        foreach ($threadIdToSortValueMap as $threadId => $sortValue) {
            $sortValue = str_replace(',', '.', $sortValue);
            $sortValue = (float) $sortValue * 100;
            $this->object->setThreadSorting((int) $threadId, $sortValue);
        }

        \ilUtil::sendSuccess($this->lng->txt('saved_successfully'), true);
        $this->ctrl->redirect($this, 'showThreads');
    }

    public function mergeThreadsObject()
    {
        if (!$this->is_moderator) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $threadIdToMerge = (int) ($this->httpRequest->getQueryParams()['merge_thread_id'] ?? 0);
        if (!($threadIdToMerge > 0)) {
            $threadIds = array_values(
                array_filter(array_map('intval', (array) $this->httpRequest->getParsedBody()['thread_ids'] ?? []))
            );
            if (1 === count($threadIds)) {
                $threadIdToMerge = current($threadIds);
            } else {
                \ilUtil::sendInfo($this->lng->txt('select_one'));
                $this->showThreadsObject();
                return;
            }
        }

        $frm = $this->object->Forum;
        $frm->setForumId($this->object->getId());
        $frm->setForumRefId($this->object->getRefId());

        $threadToMerge = new ilForumTopic($threadIdToMerge);

        if (\ilForum::_lookupObjIdForForumId($threadToMerge->getForumId()) != $frm->getForumId()) {
            \ilUtil::sendFailure($this->lng->txt('not_allowed_to_merge_into_another_forum'));
            $this->showThreadsObject();
            return;
        }

        $frm->setMDB2Wherecondition('top_frm_fk = %s ', array('integer'), array($frm->getForumId()));

        $threadsTemplate = new \ilTemplate(
            'tpl.forums_threads_liste.html',
            true,
            true,
            'Modules/Forum'
        );

        $topicData = $frm->getOneTopic();
        if ($topicData) {
            $this->ctrl->setParameter($this, 'merge_thread_id', $threadIdToMerge);
            $tbl = new \ilForumTopicTableGUI(
                $this,
                'mergeThreads',
                '',
                (int) $this->httpRequest->getQueryParams()['ref_id'],
                $topicData,
                $this->is_moderator,
                $this->settings->get('forum_overview')
            );
            $tbl->setSelectedThread($threadToMerge);
            $tbl->setMapper($frm)->fetchData();
            $tbl->init();
            $threadsTemplate->setVariable('THREADS_TABLE', $tbl->getHTML());
            $this->tpl->setContent($threadsTemplate->get());
        } else {
            \ilUtil::sendFailure($this->lng->txt('select_one'));
            $this->showThreadsObject();
        }
    }

    public function confirmMergeThreadsObject()
    {
        if (!$this->is_moderator) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $sourceThreadId = (int) ($this->httpRequest->getQueryParams()['merge_thread_id'] ?? 0);
        $targetThreadIds = array_values(
            array_filter(array_map('intval', (array) $this->httpRequest->getParsedBody()['thread_ids'] ?? []))
        );

        if (!($sourceThreadId > 0) || 1 !== count($targetThreadIds)) {
            \ilUtil::sendFailure($this->lng->txt('select_one'));
            $this->mergeThreadsObject();
            return;
        }

        $targetThreadId = current($targetThreadIds);
        if ($sourceThreadId == $targetThreadId) {
            \ilUtil::sendFailure($this->lng->txt('error_same_thread_ids'));
            $this->showThreadsObject();
            return;
        }

        if (ilForumTopic::lookupForumIdByTopicId($sourceThreadId) != ilForumTopic::lookupForumIdByTopicId($targetThreadId)) {
            \ilUtil::sendFailure($this->lng->txt('not_allowed_to_merge_into_another_forum'));
            $this->ctrl->clearParameters($this);
            $this->showThreadsObject();
            return;
        }

        if (\ilForumTopic::_lookupDate($sourceThreadId) < ilForumTopic::_lookupDate($targetThreadId)) {
            \ilUtil::sendInfo($this->lng->txt('switch_threads_for_merge'));
        }

        $this->ensureThreadBelongsToForum((int) $this->object->getId(), new \ilForumTopic((int) $sourceThreadId));
        $this->ensureThreadBelongsToForum((int) $this->object->getId(), new \ilForumTopic((int) $targetThreadId));

        $c_gui = new ilConfirmationGUI();

        $c_gui->setFormAction($this->ctrl->getFormAction($this, 'performMergeThreads'));
        $c_gui->setHeaderText($this->lng->txt('frm_sure_merge_threads'));
        $c_gui->setCancel($this->lng->txt('cancel'), 'showThreads');
        $c_gui->setConfirm($this->lng->txt('confirm'), 'performMergeThreads');

        $c_gui->addItem(
            'thread_ids[]',
            $sourceThreadId,
            sprintf($this->lng->txt('frm_merge_src'), ilForumTopic::_lookupTitle($sourceThreadId))
        );
        $c_gui->addItem(
            'thread_ids[]',
            $targetThreadId,
            sprintf($this->lng->txt('frm_merge_target'), ilForumTopic::_lookupTitle($targetThreadId))
        );
        $this->tpl->setContent($c_gui->getHTML());
    }

    public function performMergeThreadsObject()
    {
        if (!$this->is_moderator) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $threadIds = array_values(
            array_filter(array_map('intval', (array) $this->httpRequest->getParsedBody()['thread_ids'] ?? []))
        );
        if (2 !== count($threadIds)) {
            ilUtil::sendFailure($this->lng->txt('select_one'));
            $this->showThreadsObject();
            return;
        }

        if ((int) $threadIds[0] === (int) $threadIds[1]) {
            ilUtil::sendFailure($this->lng->txt('error_same_thread_ids'));
            $this->showThreadsObject();
            return;
        }

        try {
            $frm = new \ilForum();
            $frm->setForumId($this->object->getId());
            $frm->setForumRefId($this->object->getRefId());

            $this->ensureThreadBelongsToForum((int) $this->object->getId(), new \ilForumTopic((int) $threadIds[0]));
            $this->ensureThreadBelongsToForum((int) $this->object->getId(), new \ilForumTopic((int) $threadIds[1]));

            $frm->mergeThreads((int) $threadIds[0], (int) $threadIds[1]);
            \ilUtil::sendSuccess($this->lng->txt('merged_threads_successfully'));
        } catch (\ilException $e) {
            \ilUtil::sendFailure($this->lng->txt($e->getMessage()));
        }

        $this->showThreadsObject();
    }

    protected function setSideBlocks()
    {
        $content = $this->getRightColumnHTML();
        if (!$this->ctrl->isAsynch()) {
            $content = implode('', [
                \ilRepositoryObjectSearchGUI::getSearchBlockHTML($this->lng->txt('frm_search')),
                $content,
            ]);
        }
        $this->tpl->setRightContent($content);
    }

    protected function deliverDraftZipFileObject()
    {
        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $draftId = $this->httpRequest->getQueryParams()['draft_id'] ?? 0;
        $draft = \ilForumPostDraft::newInstanceByDraftId((int) $draftId);
        if ($draft->getPostAuthorId() == $this->user->getId()) {
            $fileData = new \ilFileDataForumDrafts(0, $draft->getDraftId());
            if (!$fileData->deliverZipFile()) {
                $this->ctrl->redirect($this);
            }
        }
    }

    protected function deliverZipFileObject()
    {
        if (!$this->access->checkAccess('read', '', $this->object->getRefId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $this->ensureThreadBelongsToForum((int) $this->object->getId(), $this->objCurrentPost->getThread());

        $fileData = new \ilFileDataForum($this->object->getId(), $this->objCurrentPost->getId());
        if (!$fileData->deliverZipFile()) {
            $this->ctrl->redirect($this);
        }
    }

    protected function editThreadDraftObject(\ilPropertyFormGUI $form = null)
    {
        if (
            !$this->access->checkAccess('add_thread', '', $this->object->getRefId()) ||
            !$this->access->checkAccess('read', '', $this->object->getRefId()) ||
            !\ilForumPostDraft::isSavePostDraftAllowed()
        ) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $frm = $this->object->Forum;
        $frm->setForumId($this->object->getId());
        $frm->setForumRefId($this->object->getRefId());

        $draft = new \ilForumPostDraft();
        $draftId = (int) ($this->httpRequest->getQueryParams()['draft_id'] ?? 0);
        if ($draftId > 0) {
            $draft = $draft->newInstanceByDraftId($draftId);
        }

        $historyCheck = (int) ($this->httpRequest->getQueryParams()['hist_check'] ?? 1);
        if (!($form instanceof \ilPropertyFormGUI) && $historyCheck > 0) {
            $this->doHistoryCheck($draft->getDraftId());
        }

        if (!$form instanceof \ilPropertyFormGUI) {
            $form = $this->buildThreadForm(true);
            $form->setValuesByArray([
                'alias' => $draft->getPostUserAlias(),
                'subject' => $draft->getPostSubject(),
                'message' => \ilRTE::_replaceMediaObjectImageSrc($frm->prepareText($draft->getPostMessage(), 2), 1),
                'notify' => $draft->getNotify() ? true : false,
                'userfile' => '',
                'del_file' => []
            ]);
        } else {
            $this->ctrl->setParameter($this, 'draft_id', $draftId);
        }

        $this->tpl->setContent($form->getHTML() . $this->modal_history);
    }

    protected function restoreFromHistoryObject()
    {
        $historyId = (int) ($this->httpRequest->getQueryParams()['history_id'] ?? 0);
        $history = new \ilForumDraftsHistory($historyId);

        $draft = $history->rollbackAutosave();
        if ($draft->getThreadId() == 0 && $draft->getPostId() == 0) {
            $this->ctrl->setParameter($this, 'draft_id', $history->getDraftId());
            $this->ctrl->redirect($this, 'editThreadDraft');
        }

        $this->ctrl->clearParameters($this);
        $this->ctrl->setParameter($this, 'pos_pk', $draft->getPostId());
        $this->ctrl->setParameter($this, 'thr_pk', $draft->getThreadId());
        $this->ctrl->setParameter($this, 'draft_id', $draft->getDraftId());
        $this->ctrl->setParameter($this, 'action', 'editdraft');

        // create draft backup before redirect!
        \ilForumPostDraft::createDraftBackup((int) $draft->getDraftId());

        $this->ctrl->redirect($this, 'viewThread');
    }

    protected function saveThreadAsDraftObject()
    {
        if (
            !$this->access->checkAccess('add_thread', '', $this->object->getRefId()) ||
            !$this->access->checkAccess('read', '', $this->object->getRefId()) ||
            !\ilForumPostDraft::isSavePostDraftAllowed()
        ) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $autoSavedDraftId = (int) ($this->httpRequest->getParsedBody()['draft_id'] ?? 0);
        if ($autoSavedDraftId <= 0) {
            $autoSavedDraftId = (int) ($this->httpRequest->getQueryParams()['draft_id'] ?? 0);
        }

        $frm = $this->object->Forum;
        $frm->setForumId($this->object->getId());
        $frm->setForumRefId($this->object->getRefId());
        $frm->setMDB2WhereCondition('top_frm_fk = %s ', array('integer'), array($frm->getForumId()));
        $topicData = $frm->getOneTopic();

        $form = $this->buildThreadForm();
        if ($form->checkInput()) {
            $this->doCaptchaCheck();

            if (0 === $autoSavedDraftId) {
                $draft = new \ilForumPostDraft();
            } else {
                $draft = \ilForumPostDraft::newInstanceByDraftId($autoSavedDraftId);
            }

            $draft->setForumId($topicData['top_pk']);
            $draft->setThreadId(0);
            $draft->setPostId(0);
            $draft->setPostSubject($this->handleFormInput($form->getInput('subject'), false));
            $draft->setPostMessage(\ilRTE::_replaceMediaObjectImageSrc($form->getInput('message'), 0));
            $userAlias = \ilForumUtil::getPublicUserAlias(
                $form->getInput('alias'),
                $this->objProperties->isAnonymized()
            );
            $draft->setPostUserAlias($userAlias);
            $draft->setNotify((int) $form->getInput('notify'));
            $draft->setPostAuthorId($this->user->getId());
            $draft->setPostDisplayUserId($this->isWritingWithPseudonymAllowed() ? 0 : $this->user->getId());

            if (0 === $autoSavedDraftId) {
                $draftId = $draft->saveDraft();
            } else {
                $draft->updateDraft();
                $draftId = $draft->getDraftId();
            }

            $GLOBALS['ilAppEventHandler']->raise(
                'Modules/Forum',
                'savedAsDraft',
                [
                'draftObj' => $draft,
                'obj_id' => $this->object->getId(),
                'is_file_upload_allowed' => $this->objProperties->isFileUploadAllowed(),
            ]
            );

            \ilForumUtil::moveMediaObjects($form->getInput('message'), 'frm~d:html', $draftId, 'frm~d:html', $draftId);

            $draftFileData = new \ilFileDataForumDrafts($this->object->getId(), $draftId);

            $files2delete = $form->getInput('del_file');
            if (is_array($files2delete) && count($files2delete) > 0) {
                $draftFileData->unlinkFilesByMD5Filenames($files2delete);
            }

            if ($this->objProperties->isFileUploadAllowed()) {
                $file = $_FILES['userfile'];
                if (is_array($file) && !empty($file)) {
                    $draftFileData->storeUploadedFile($file);
                }
            }

            \ilUtil::sendSuccess($this->lng->txt('save_draft_successfully'), true);
            $this->ctrl->clearParameters($this);
            $this->ctrl->redirect($this, 'showThreads');
        }

        $this->requestAction = substr($this->requestAction, 6); // @nmatuschek: Why this, I don't get it???
        $form->setValuesByPost();
        $this->ctrl->setParameter($this, 'draft_id', $autoSavedDraftId);
        $this->tpl->setContent($form->getHTML());
    }

    protected function updateThreadDraftObject()
    {
        if (
            !$this->access->checkAccess('add_thread', '', $this->object->getRefId()) ||
            !$this->access->checkAccess('read', '', $this->object->getRefId()) ||
            !\ilForumPostDraft::isSavePostDraftAllowed()
        ) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $draftId = (int) ($this->httpRequest->getQueryParams()['draft_id'] ?? 0);
        if ($draftId <= 0 || !$this->checkDraftAccess($draftId)) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $form = $this->buildThreadForm(true);
        if ($form->checkInput()) {
            $this->doCaptchaCheck();

            $userAlias = \ilForumUtil::getPublicUserAlias(
                $form->getInput('alias'),
                $this->objProperties->isAnonymized()
            );

            $draft = \ilForumPostDraft::newInstanceByDraftId($draftId);
            $draft->setPostSubject($this->handleFormInput($form->getInput('subject'), false));
            $draft->setPostMessage(\ilRTE::_replaceMediaObjectImageSrc($form->getInput('message'), 0));
            $draft->setPostUserAlias($userAlias);
            $draft->setNotify((int) $form->getInput('notify'));
            $draft->setPostAuthorId($this->user->getId());
            $draft->setPostDisplayUserId($this->isWritingWithPseudonymAllowed() ? 0 : $this->user->getId());
            $draft->updateDraft();

            $GLOBALS['ilAppEventHandler']->raise(
                'Modules/Forum',
                'updatedDraft',
                [
                'draftObj' => $draft,
                'obj_id' => $this->object->getId(),
                'is_file_upload_allowed' => $this->objProperties->isFileUploadAllowed(),
            ]
            );

            \ilForumUtil::moveMediaObjects(
                $form->getInput('message'),
                'frm~d:html',
                $draft->getDraftId(),
                'frm~d:html',
                $draft->getDraftId()
            );

            $draftFileData = new \ilFileDataForumDrafts($this->object->getId(), $draft->getDraftId());

            $files2delete = $form->getInput('del_file');
            if (is_array($files2delete) && count($files2delete) > 0) {
                $draftFileData->unlinkFilesByMD5Filenames($files2delete);
            }

            if ($this->objProperties->isFileUploadAllowed()) {
                $file = $_FILES['userfile'];
                if (is_array($file) && !empty($file)) {
                    $draftFileData->storeUploadedFile($file);
                }
            }

            \ilUtil::sendSuccess($this->lng->txt('save_draft_successfully'), true);
            $this->ctrl->clearParameters($this);
            $this->ctrl->redirect($this, 'showThreads');
        }

        $form->setValuesByPost();
        $this->ctrl->setParameter($this, 'hist_check', 0);
        $this->ctrl->setParameter($this, 'draft_id', $draftId);
        $this->editThreadDraftObject($form);
    }

    public function saveTopLevelDraftObject() : void
    {
        $this->saveAsDraftObject();
    }

    public function saveAsDraftObject()
    {
        if (!$this->objCurrentTopic->getId()) {
            \ilUtil::sendFailure($this->lng->txt('frm_action_not_possible_thr_deleted'), true);
            $this->ctrl->redirect($this);
        }

        if ($this->objCurrentTopic->isClosed()) {
            \ilUtil::sendFailure($this->lng->txt('frm_action_not_possible_thr_closed'), true);
            $this->ctrl->redirect($this);
        }

        if (!isset($_POST['del_file']) || !is_array($_POST['del_file'])) {
            $_POST['del_file'] = array();
        }

        $autosave_draft_id = 0;
        if (ilForumPostDraft::isAutoSavePostDraftAllowed() && isset($_POST['draft_id'])) {
            $autosave_draft_id = (int) $_POST['draft_id'];
        }
        $oReplyEditForm = $this->getReplyEditForm();
        if ($oReplyEditForm->checkInput()) {
            if (!$this->objCurrentPost->getId()) {
                $this->requestAction = '';
                \ilUtil::sendFailure($this->lng->txt('frm_action_not_possible_parent_deleted'));
                $this->viewThreadObject();
                return;
            }

            $this->doCaptchaCheck();

            // init objects
            $oForumObjects = $this->getForumObjects();
            $forumObj = $oForumObjects['forumObj'];
            $frm = $oForumObjects['frm'];
            $frm->setMDB2WhereCondition(' top_frm_fk = %s ', array('integer'), array($frm->getForumId()));
            $topicData = $frm->getOneTopic();

            // Generating new posting
            if ($this->requestAction == 'ready_showreply') {
                if (!$this->access->checkAccess('add_reply', '', (int) $_GET['ref_id'])) {
                    $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
                }

                $user_alias = ilForumUtil::getPublicUserAlias(
                    $oReplyEditForm->getInput('alias'),
                    $this->objProperties->isAnonymized()
                );

                if ($autosave_draft_id == 0) {
                    $draftObj = new ilForumPostDraft();
                } else {
                    $draftObj = ilForumPostDraft::newInstanceByDraftId($autosave_draft_id);
                }
                $draftObj->setForumId($topicData['top_pk']);
                $draftObj->setThreadId($this->objCurrentTopic->getId());
                $draftObj->setPostId($this->objCurrentPost->getId());

                $draftObj->setPostSubject($this->handleFormInput($oReplyEditForm->getInput('subject'), false));
                $draftObj->setPostMessage(ilRTE::_replaceMediaObjectImageSrc($oReplyEditForm->getInput('message'), 0));
                $draftObj->setPostUserAlias($user_alias);
                $draftObj->setNotify((int) $oReplyEditForm->getInput('notify'));
                $draftObj->setPostNotify((int) $oReplyEditForm->getInput('notify_post'));

                $draftObj->setPostAuthorId($this->user->getId());
                $draftObj->setPostDisplayUserId(($this->isWritingWithPseudonymAllowed() ? 0 : $this->user->getId()));

                if ($autosave_draft_id == 0) {
                    $draft_id = $draftObj->saveDraft();
                } else {
                    $draftObj->updateDraft();
                    $draft_id = $draftObj->getDraftId();
                }

                if (ilForumPostDraft::isSavePostDraftAllowed()) {
                    $GLOBALS['ilAppEventHandler']->raise(
                        'Modules/Forum',
                        'savedAsDraft',
                        array(
                            'draftObj' => $draftObj,
                            'obj_id' => $this->object->getId(),
                            'is_file_upload_allowed' => $this->objProperties->isFileUploadAllowed()
                        )
                    );
                }

                if ($this->objProperties->isFileUploadAllowed()) {
                    $file = $_FILES['userfile'];
                    if (is_array($file) && !empty($file)) {
                        $oFDForumDrafts = new ilFileDataForumDrafts($this->object->getId(), $draftObj->getDraftId());
                        $oFDForumDrafts->storeUploadedFile($file);
                    }
                }

                // copy temporary media objects (frm~)
                ilForumUtil::moveMediaObjects(
                    $oReplyEditForm->getInput('message'),
                    'frm~d:html',
                    $draft_id,
                    'frm~d:html',
                    $draft_id
                );

                $_SESSION['frm'][(int) $_GET['thr_pk']]['openTreeNodes'][] = (int) $this->objCurrentPost->getId();

                ilUtil::sendSuccess($this->lng->txt('save_draft_successfully'), true);
                $this->ctrl->setParameter($this, 'pos_pk', $this->objCurrentPost->getId());
                $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentPost->getThreadId());
                $this->ctrl->redirect($this, 'viewThread');
            }
        } else {
            $oReplyEditForm->setValuesByPost();
            $this->requestAction = substr($this->requestAction, 6);
        }
        return $this->viewThreadObject();
    }

    protected function editDraftObject()
    {
        if (\ilForumPostDraft::isAutoSavePostDraftAllowed()) {
            $draftId = (int) ($this->httpRequest->getQueryParams()['draft_id'] ?? 0);
            if ($this->checkDraftAccess($draftId)) {
                $this->doHistoryCheck($draftId);
            }
        }

        $this->viewThreadObject();
    }

    public function updateDraftObject()
    {
        if (!$this->objCurrentTopic->getId()) {
            \ilUtil::sendFailure($this->lng->txt('frm_action_not_possible_thr_deleted'), true);
            $this->ctrl->redirect($this);
        }

        if ($this->objCurrentTopic->isClosed()) {
            \ilUtil::sendFailure($this->lng->txt('frm_action_not_possible_thr_closed'), true);
            $this->ctrl->redirect($this);
        }

        if (!$this->objCurrentPost->getId()) {
            $this->requestAction = '';
            \ilUtil::sendFailure($this->lng->txt('frm_action_not_possible_parent_deleted'));
            $this->viewThreadObject();
            return;
        }

        if (!isset($_POST['del_file']) || !is_array($_POST['del_file'])) {
            $_POST['del_file'] = array();
        }

        $oReplyEditForm = $this->getReplyEditForm();
        if ($oReplyEditForm->checkInput()) {
            $this->doCaptchaCheck();

            // init objects
            $oForumObjects = $this->getForumObjects();
            $forumObj = $oForumObjects['forumObj'];

            if (!$this->user->isAnonymous() && in_array($this->requestAction, ['showdraft', 'editdraft'])) {
                if (!$this->access->checkAccess('add_reply', '', (int) $_GET['ref_id'])) {
                    $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
                }
                if (!$this->checkDraftAccess((int) $_GET['draft_id'])) {
                    $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
                }

                $user_alias = ilForumUtil::getPublicUserAlias(
                    $oReplyEditForm->getInput('alias'),
                    $this->objProperties->isAnonymized()
                );

                // generateDraft
                $update_draft = new ilForumPostDraft(
                    $this->user->getId(),
                    $this->objCurrentPost->getId(),
                    (int) $_GET['draft_id']
                );

                $update_draft->setPostSubject($this->handleFormInput($oReplyEditForm->getInput('subject'), false));
                $update_draft->setPostMessage(ilRTE::_replaceMediaObjectImageSrc(
                    $oReplyEditForm->getInput('message'),
                    0
                ));
                $update_draft->setPostUserAlias($user_alias);
                $update_draft->setNotify((int) $oReplyEditForm->getInput('notify'));
                $update_draft->setUpdateUserId($this->user->getId());
                $update_draft->setPostAuthorId($this->user->getId());
                $update_draft->setPostDisplayUserId($this->isWritingWithPseudonymAllowed() ? 0 : $this->user->getId());

                $update_draft->updateDraft();

                if (ilForumPostDraft::isSavePostDraftAllowed()) {
                    $GLOBALS['ilAppEventHandler']->raise(
                        'Modules/Forum',
                        'updatedDraft',
                        array(
                            'draftObj' => $update_draft,
                            'obj_id' => $this->object->getId(),
                            'is_file_upload_allowed' => $this->objProperties->isFileUploadAllowed()
                        )
                    );
                }

                $uploadedObjects = ilObjMediaObject::_getMobsOfObject('frm~:html', $this->user->getId());

                foreach ($uploadedObjects as $mob) {
                    ilObjMediaObject::_removeUsage($mob, 'frm~:html', $this->user->getId());
                    ilObjMediaObject::_saveUsage($mob, 'frm~d:html', $update_draft->getDraftId());
                }
                ilForumUtil::saveMediaObjects(
                    $oReplyEditForm->getInput('message'),
                    'frm~d:html',
                    $update_draft->getDraftId()
                );

                $oFDForumDrafts = new ilFileDataForumDrafts($forumObj->getId(), $update_draft->getDraftId());

                $file2delete = $oReplyEditForm->getInput('del_file');
                if (is_array($file2delete) && count($file2delete)) {
                    $oFDForumDrafts->unlinkFilesByMD5Filenames($file2delete);
                }

                if ($this->objProperties->isFileUploadAllowed()) {
                    $file = $_FILES['userfile'];
                    if (is_array($file) && !empty($file)) {
                        $oFDForumDrafts->storeUploadedFile($file);
                    }
                }

                $_SESSION['frm'][(int) $_GET['thr_pk']]['openTreeNodes'][] = (int) $this->objCurrentPost->getId();
                ilUtil::sendSuccess($this->lng->txt('save_draft_successfully'), true);
            }
            $this->ctrl->clearParameters($this);
            $this->ctrl->setParameter($this, 'pos_pk', $this->objCurrentPost->getId());
            $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentPost->getThreadId());
            $this->ctrl->setParameter($this, 'draft_id', $update_draft->getDraftId());
        } else {
            $this->ctrl->clearParameters($this);
            $this->ctrl->setParameter($this, 'pos_pk', $this->objCurrentPost->getId());
            $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentPost->getThreadId());
            $this->ctrl->setParameter($this, 'draft_id', (int) $_GET['draft_id']);
            $this->ctrl->setParameter($this, 'action', 'editdraft');
            $oReplyEditForm->setValuesByPost();
            return $this->viewThreadObject();
        }
        $this->ctrl->clearParameters($this);
        $this->ctrl->setParameter($this, 'pos_pk', $this->objCurrentPost->getId());
        $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentPost->getThreadId());
        $this->ctrl->redirect($this, 'viewThread');
    }

    protected function deleteMobsOfDraft($draft_id, $message)
    {
        // remove usage of deleted media objects
        $oldMediaObjects = ilObjMediaObject::_getMobsOfObject('frm~d:html', $draft_id);
        $curMediaObjects = ilRTE::_getMediaObjects($message, 0);
        foreach ($oldMediaObjects as $oldMob) {
            $found = false;
            foreach ($curMediaObjects as $curMob) {
                if ($oldMob == $curMob) {
                    $found = true;
                    break;
                }
            }
            if (!$found) {
                if (ilObjMediaObject::_exists($oldMob)) {
                    ilObjMediaObject::_removeUsage($oldMob, 'frm~d:html', $draft_id);
                    $mob_obj = new ilObjMediaObject($oldMob);
                    $mob_obj->delete();
                }
            }
        }
    }

    protected function deleteSelectedDraft(ilForumPostDraft $draft_obj = null)
    {
        if (
            !$this->access->checkAccess('add_reply', '', (int) $_GET['ref_id']) ||
            $this->user->isAnonymous() ||
            ($draft_obj instanceof ilForumPostDraft && $this->user->getId() != $draft_obj->getPostAuthorId())) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        $post_id = $this->objCurrentPost->getId();
        if (!($draft_obj instanceof ilForumPostDraft)) {
            $draft_id_to_delete = (int) $_GET['draft_id'];
            $draft_obj = new ilForumPostDraft($this->user->getId(), $post_id, $draft_id_to_delete);

            if (!$draft_obj->getDraftId() || ($draft_obj->getDraftId() != $draft_id_to_delete)) {
                $this->ctrl->clearParameters($this);
                $this->ctrl->setParameter($this, 'pos_pk', $this->objCurrentPost->getId());
                $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentPost->getThreadId());
                $this->ctrl->redirect($this, 'viewThread');
            }
        }

        $this->deleteMobsOfDraft($draft_obj->getDraftId(), $draft_obj->getPostMessage());

        $objFileDataForumDrafts = new ilFileDataForumDrafts(0, $draft_obj->getDraftId());
        $objFileDataForumDrafts->delete();

        if (ilForumPostDraft::isSavePostDraftAllowed()) {
            $GLOBALS['ilAppEventHandler']->raise(
                'Modules/Forum',
                'deletedDraft',
                array(
                    'draftObj' => $draft_obj,
                    'obj_id' => $this->object->getId(),
                    'is_file_upload_allowed' => $this->objProperties->isFileUploadAllowed()
                )
            );
        }
        $draft_obj->deleteDraft();

        ilUtil::sendSuccess($this->lng->txt('delete_draft_successfully'), true);
        $this->ctrl->clearParameters($this);
        $this->ctrl->setParameter($this, 'pos_pk', $this->objCurrentPost->getId());
        $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentPost->getThreadId());
        $this->ctrl->redirect($this, 'viewThread');
    }

    protected function autosaveDraftAsyncObject()
    {
        $draftId = (int) ($this->httpRequest->getQueryParams()['draft_id'] ?? 0);
        if (
            $this->requestAction !== 'ready_showreply' &&
            $this->access->checkAccess('read', '', $this->object->getRefId()) &&
            $this->access->checkAccess('add_reply', '', $this->object->getRefId())
        ) {
            $action = new \ilForumAutoSaveAsyncDraftAction(
                $this->user,
                $this->getReplyEditForm(),
                $this->objProperties,
                $this->objCurrentTopic,
                $this->objCurrentPost,
                function (string $message) : string {
                    return $this->handleFormInput($message);
                },
                $draftId,
                (int) \ilObjForum::lookupForumIdByRefId($this->ref_id),
                \ilUtil::stripSlashes($this->requestAction)
            );

            $this->http->saveResponse($this->http->response()->withBody(
                \ILIAS\Filesystem\Stream\Streams::ofString(json_encode($action->executeAndGetResponseObject()))
            ));
        }

        $this->http->sendResponse();
        $this->http->close();
    }

    protected function autosaveThreadDraftAsyncObject()
    {
        $draftId = (int) ($this->httpRequest->getQueryParams()['draft_id'] ?? 0);
        if (
            $this->requestAction !== 'ready_showreply' &&
            $this->access->checkAccess('read', '', $this->object->getRefId()) &&
            $this->access->checkAccess('add_thread', '', $this->object->getRefId())
        ) {
            $action = new \ilForumAutoSaveAsyncDraftAction(
                $this->user,
                $this->buildThreadForm(),
                $this->objProperties,
                $this->objCurrentTopic,
                $this->objCurrentPost,
                function (string $message) : string {
                    return $this->handleFormInput($message, false);
                },
                $draftId,
                (int) \ilObjForum::lookupForumIdByRefId($this->ref_id),
                \ilUtil::stripSlashes($this->requestAction)
            );

            $this->http->saveResponse($this->http->response()->withBody(
                \ILIAS\Filesystem\Stream\Streams::ofString(json_encode($action->executeAndGetResponseObject()))
            ));
        }

        $this->http->sendResponse();
        $this->http->close();
    }

    private function renderSplitButton(
        ilTemplate $tpl,
        string $action,
        bool $is_post,
        ilForumPost $node,
        int $pageIndex = 0,
        ilForumPostDraft $draft = null
    ) {
        $actions = [];
        $modalActions = [];
        if ($is_post) {
            if (
                $this->objCurrentPost->getId() != $node->getId() || (
                    !in_array($action, ['showreply', 'showedit', 'censor', 'delete'], true) &&
                    !$this->displayConfirmPostActivation()
                )
            ) {
                if ($this->is_moderator || $node->isActivated() || $node->isOwner($this->user->getId())) {
                    if ($this->is_moderator && !$this->objCurrentTopic->isClosed() && !$node->isActivated()) {
                        $this->ctrl->setParameter($this, 'pos_pk', $node->getId());
                        $this->ctrl->setParameter($this, 'thr_pk', $node->getThreadId());
                        $this->ctrl->setParameter($this, 'page', $pageIndex);
                        $this->ctrl->setParameter(
                            $this,
                            'orderby',
                            ilUtil::stripSlashes($this->httpRequest->getQueryParams()['orderby'])
                        );
                        $actions['activate_post'] = $this->ctrl->getLinkTarget(
                            $this,
                            'askForPostActivation',
                            $node->getId()
                        );
                        $this->ctrl->clearParameters($this);
                    }

                    if (
                        !$this->objCurrentTopic->isClosed() && $node->isActivated() && !$node->isCensored() &&
                        $this->access->checkAccess('add_reply', '', (int) $this->object->getRefId())
                    ) {
                        $this->ctrl->setParameter($this, 'action', 'showreply');
                        $this->ctrl->setParameter($this, 'pos_pk', $node->getId());
                        $this->ctrl->setParameter($this, 'page', $pageIndex);
                        $this->ctrl->setParameter(
                            $this,
                            'orderby',
                            ilUtil::stripSlashes($this->httpRequest->getQueryParams()['orderby'])
                        );
                        $this->ctrl->setParameter($this, 'thr_pk', $node->getThreadId());
                        $actions['reply_to_postings'] = $this->ctrl->getLinkTarget(
                            $this,
                            'viewThread',
                            'reply_' . $node->getId()
                        );
                        $this->ctrl->clearParameters($this);
                    }

                    if (
                        !$this->objCurrentTopic->isClosed() &&
                        !$node->isCensored() &&
                        !$this->user->isAnonymous() &&
                        ($node->isOwner($this->user->getId()) || $this->is_moderator)
                    ) {
                        $this->ctrl->setParameter($this, 'action', 'showedit');
                        $this->ctrl->setParameter($this, 'pos_pk', $node->getId());
                        $this->ctrl->setParameter($this, 'thr_pk', $node->getThreadId());
                        $this->ctrl->setParameter($this, 'page', $pageIndex);
                        $this->ctrl->setParameter(
                            $this,
                            'orderby',
                            ilUtil::stripSlashes($this->httpRequest->getQueryParams()['orderby'])
                        );
                        $actions['edit'] = $this->ctrl->getLinkTarget($this, 'viewThread', $node->getId());
                        $this->ctrl->clearParameters($this);
                    }

                    if (!$this->user->isAnonymous()) {
                        $this->ctrl->setParameter($this, 'pos_pk', $node->getId());
                        $this->ctrl->setParameter($this, 'thr_pk', $node->getThreadId());
                        $this->ctrl->setParameter($this, 'page', $pageIndex);
                        $this->ctrl->setParameter(
                            $this,
                            'orderby',
                            ilUtil::stripSlashes($this->httpRequest->getQueryParams()['orderby'])
                        );
                        $this->ctrl->setParameter($this, 'viewmode', $this->selectedSorting);

                        $read_undread_txt = 'frm_mark_as_read';
                        $read_undread_cmd = 'markPostRead';
                        if ($node->isPostRead()) {
                            $read_undread_txt = 'frm_mark_as_unread';
                            $read_undread_cmd = 'markPostUnread';
                        }
                        $actions[$read_undread_txt] = $this->ctrl->getLinkTarget(
                            $this,
                            $read_undread_cmd,
                            $node->getId()
                        );

                        $this->ctrl->clearParameters($this);
                    }

                    if (!$node->isCensored()) {
                        $this->ctrl->setParameterByClass('ilforumexportgui', 'print_post', $node->getId());
                        $this->ctrl->setParameterByClass('ilforumexportgui', 'top_pk', $node->getForumId());
                        $this->ctrl->setParameterByClass('ilforumexportgui', 'thr_pk', $node->getThreadId());

                        $actions['print'] = $this->ctrl->getLinkTargetByClass('ilforumexportgui', 'printPost');

                        $this->ctrl->clearParameters($this);
                    }

                    if (
                        !$this->objCurrentTopic->isClosed() &&
                        !$this->user->isAnonymous() &&
                        ($this->is_moderator || ($node->isOwner($this->user->getId()) && !$node->hasReplies()))
                    ) {
                        $this->ctrl->setParameter($this, 'pos_pk', $node->getId());
                        $this->ctrl->setParameter($this, 'thr_pk', $node->getThreadId());
                        $this->ctrl->setParameter($this, 'page', $pageIndex);
                        $this->ctrl->setParameter(
                            $this,
                            'orderby',
                            ilUtil::stripSlashes($this->httpRequest->getQueryParams()['orderby'])
                        );
                        $actions['delete'] = $this->ctrl->getFormAction($this, 'deletePosting');
                        $this->ctrl->clearParameters($this);
                    }

                    if ($this->is_moderator && !$this->objCurrentTopic->isClosed()) {
                        $this->ctrl->setParameter($this, 'pos_pk', $node->getId());
                        $this->ctrl->setParameter($this, 'thr_pk', $node->getThreadId());
                        $this->ctrl->setParameter($this, 'page', $pageIndex);
                        $this->ctrl->setParameter(
                            $this,
                            'orderby',
                            ilUtil::stripSlashes($this->httpRequest->getQueryParams()['orderby'])
                        );
                        if ($node->isCensored()) {
                            $this->ctrl->setParameter($this, 'action', 'viewThread');
                            $actions['frm_revoke_censorship'] = $this->ctrl->getFormAction($this, 'revokeCensorship');
                        } else {
                            $actions['frm_censorship'] = $this->ctrl->getFormAction($this, 'addCensorship');
                        }
                        $this->ctrl->clearParameters($this);
                    }
                }
            }
        } elseif ($_GET['draft_id'] != $draft->getDraftId() || !in_array($action, ['deletedraft', 'editdraft'])) {
            // get actions for drafts
            $this->ctrl->setParameter($this, 'action', 'publishdraft');
            $this->ctrl->setParameter($this, 'pos_pk', $node->getId());
            $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentTopic->getId());
            $this->ctrl->setParameter($this, 'page', $pageIndex);
            $this->ctrl->setParameter($this, 'draft_id', $draft->getDraftId());
            $this->ctrl->setParameter(
                $this,
                'orderby',
                \ilUtil::stripSlashes($this->httpRequest->getQueryParams()['orderby'])
            );
            $actions['publish'] = $this->ctrl->getLinkTarget($this, 'publishSelectedDraft', $node->getId());
            $this->ctrl->clearParameters($this);

            $this->ctrl->setParameter($this, 'action', 'editdraft');
            $this->ctrl->setParameter($this, 'pos_pk', $node->getId());
            $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentTopic->getId());
            $this->ctrl->setParameter($this, 'draft_id', $draft->getDraftId());
            $this->ctrl->setParameter($this, 'page', $pageIndex);
            $this->ctrl->setParameter(
                $this,
                'orderby',
                \ilUtil::stripSlashes($this->httpRequest->getQueryParams()['orderby'])
            );
            $actions['edit'] = $this->ctrl->getLinkTarget($this, 'editDraft', 'draft_edit_' . $draft->getDraftId());
            $this->ctrl->clearParameters($this);

            $this->ctrl->setParameter($this, 'pos_pk', $node->getId());
            $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentTopic->getId());
            $this->ctrl->setParameter($this, 'draft_id', $draft->getDraftId());
            $this->ctrl->setParameter($this, 'page', $pageIndex);
            $this->ctrl->setParameter(
                $this,
                'orderby',
                \ilUtil::stripSlashes($this->httpRequest->getQueryParams()['orderby'])
            );
            $actions['delete'] = $this->ctrl->getFormAction($this, 'deletePostingDraft');
            $this->ctrl->clearParameters($this);

            if (isset($_GET['draft_id']) && $action === 'editdraft') {
                $actions = [];
            }
        }

        $tpl->setCurrentBlock('posts_row');
        if (count($actions) > 0 && !$this->objCurrentTopic->isClosed()) {
            $action_button = ilSplitButtonGUI::getInstance();

            $i = 0;
            foreach ($actions as $lng_id => $url) {
                if ($i === 0) {
                    $sb_item = ilLinkButton::getInstance();
                    $sb_item->setCaption($lng_id);
                    $sb_item->setUrl($url);

                    $action_button->setDefaultButton($sb_item);
                    ++$i;
                } else {
                    if ('frm_revoke_censorship' === $lng_id || 'frm_censorship' === $lng_id) {
                        $modalTemplate = new ilTemplate("tpl.forums_censor_modal.html", true, true, 'Modules/Forum');
                        $formID = uniqid('form');
                        $modalTemplate->setVariable('FORM_ID', $formID);
                        
                        if ($node->isCensored()) {
                            $modalTemplate->setVariable('BODY', $this->lng->txt('forums_info_censor2_post'));
                        } else {
                            $modalTemplate->setVariable('BODY', $this->lng->txt('forums_info_censor_post'));
                            $modalTemplate->touchBlock('message');
                        }

                        $modalTemplate->setVariable('FORM_ACTION', $url);

                        $content = $this->uiFactory->legacy($modalTemplate->get());
                        $submitBtn = $this->uiFactory->button()->primary($this->lng->txt('submit'), '#')->withOnLoadCode(
                            static function (string $id) use ($formID) : string {
                                return "$('#{$id}').click(function() { $('#{$formID}').submit(); return false; });";
                            }
                        );
                        $modal = $this->uiFactory->modal()->roundtrip($this->lng->txt($lng_id), $content)->withActionButtons([$submitBtn]);
                        $sb_item = $this->uiFactory->button()->shy($this->lng->txt($lng_id), '#')->withOnClick(
                            $modal->getShowSignal()
                        );

                        $this->modalActionsContainer[] = $modal;

                        $action_button->addMenuItem(new ilUiLinkToSplitButtonMenuItemAdapter($sb_item, $this->uiRenderer));
                        continue;
                    } elseif ('delete' === $lng_id) {
                        $modal = $this->uiFactory->modal()->interruptive(
                            $this->lng->txt($lng_id),
                            strpos($url, 'deletePostingDraft') !== false ?
                                $this->lng->txt('forums_info_delete_draft') :
                                $this->lng->txt('forums_info_delete_post'),
                            $url
                        )->withActionButtonLabel(
                            strpos($url, 'deletePostingDraft') !== false ? 'deletePostingDraft' : 'deletePosting'
                        );

                        $deleteAction = $this->uiFactory->button()->shy($this->lng->txt($lng_id), '#')->withOnClick(
                            $modal->getShowSignal()
                        );

                        $this->modalActionsContainer[] = $modal;

                        $action_button->addMenuItem(
                            new ilUiLinkToSplitButtonMenuItemAdapter($deleteAction, $this->uiRenderer)
                        );
                        continue;
                    }

                    $sb_item = ilLinkButton::getInstance();
                    $sb_item->setCaption($lng_id);
                    $sb_item->setUrl($url);

                    $action_button->addMenuItem(new ilButtonToSplitButtonMenuItemAdapter($sb_item));
                }
            }

            $tpl->setVariable('COMMANDS', $action_button->render());
        }
    }

    public function checkDraftAccess(int $draftId) : bool
    {
        $draft = \ilForumPostDraft::newInstanceByDraftId($draftId);
        if (
            !$this->access->checkAccess('add_reply', '', $this->object->getRefId()) || $this->user->isAnonymous() ||
            ($draft instanceof \ilForumPostDraft && $this->user->getId() != $draft->getPostAuthorId())
        ) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        return true;
    }

    private function doHistoryCheck($draftId)
    {
        if (!$this->checkDraftAccess($draftId)) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->MESSAGE);
        }

        if (!\ilForumPostDraft::isAutoSavePostDraftAllowed()) {
            return;
        }

        \iljQueryUtil::initjQuery();
        $draftsFromHistory = \ilForumDraftsHistory::getInstancesByDraftId($draftId);
        if (is_array($draftsFromHistory) && sizeof($draftsFromHistory) > 0) {
            $modal = \ilModalGUI::getInstance();
            $modal->setHeading($this->lng->txt('restore_draft_from_autosave'));
            $modal->setId('frm_autosave_restore');
            $form_tpl = new \ilTemplate('tpl.restore_thread_draft.html', true, true, 'Modules/Forum');

            foreach ($draftsFromHistory as $key => $history_instance) {
                $accordion = new ilAccordionGUI();
                $accordion->setId('acc_' . $history_instance->getHistoryId());

                $form_tpl->setCurrentBlock('list_item');
                $message = \ilRTE::_replaceMediaObjectImageSrc($history_instance->getPostMessage(), 1);

                $history_date = ilDatePresentation::formatDate(new ilDateTime(
                    $history_instance->getDraftDate(),
                    IL_CAL_DATETIME
                ));
                $this->ctrl->setParameter($this, 'history_id', $history_instance->getHistoryId());
                $header = $history_date . ' - ' . $history_instance->getPostSubject();
                $accordion->addItem($header, $message . $this->uiRenderer->render(
                    $this->uiFactory->button()->standard(
                        $this->lng->txt('restore'),
                        $this->ctrl->getLinkTarget($this, 'restoreFromHistory')
                    )
                ));

                $form_tpl->setVariable('ACC_AUTO_SAVE', $accordion->getHtml());
                $form_tpl->parseCurrentBlock();
            }

            $form_tpl->setVariable('RESTORE_DATA_EXISTS', 'found_threat_history_to_restore');
            $modal->setBody($form_tpl->get());
            $modal->initJS();
            $this->modal_history = $modal->getHTML();
        } else {
            ilForumPostDraft::createDraftBackup($draftId);
        }
    }

    protected function doCaptchaCheck()
    {
        if ($this->user->isAnonymous() && !$this->user->isCaptchaVerified() && \ilCaptchaUtil::isActiveForForum()) {
            $this->user->setCaptchaVerified(true);
        }
    }

    private function renderPostingForm(ilTemplate $tpl, ilForum $frm, ilForumPost $node, string $action)
    {
        if (
            $action == 'showedit' && (
                (!$this->is_moderator && !$node->isOwner($this->user->getId()) || $this->user->isAnonymous()) || $node->isCensored()
            )
        ) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->getMessage());
        } elseif ($action == 'showreply' && !$this->access->checkAccess('add_reply', '', (int) $_GET['ref_id'])) {
            $this->error->raiseError($this->lng->txt('permission_denied'), $this->error->getMessage());
        }

        $tpl->setVariable('REPLY_ANKER', 'reply_' . $this->objCurrentPost->getId());
        $oEditReplyForm = $this->getReplyEditForm();
        if ($action !== 'editdraft') {
            switch ($this->objProperties->getSubjectSetting()) {
                case 'add_re_to_subject':
                    $subject = $this->getModifiedReOnSubject(true);
                    break;

                case 'preset_subject':
                    $subject = $this->objCurrentPost->getSubject();
                    break;

                case 'empty_subject':
                default:
                    $subject = null;
                    break;
            }
        }

        switch ($action) {
            case 'showreply':
                if ($this->ctrl->getCmd() == 'savePost' || $this->ctrl->getCmd() == 'saveAsDraft') {
                    $oEditReplyForm->setValuesByPost();
                } elseif ($this->ctrl->getCmd() == 'quotePost') {
                    $authorinfo = new ilForumAuthorInformation(
                        $node->getPosAuthorId(),
                        $node->getDisplayUserId(),
                        $node->getUserAlias(),
                        $node->getImportName()
                    );

                    $oEditReplyForm->setValuesByPost();
                    $oEditReplyForm->getItemByPostVar('message')->setValue(
                        ilRTE::_replaceMediaObjectImageSrc(
                            $frm->prepareText(
                                $node->getMessage(),
                                1,
                                $authorinfo->getAuthorName()
                            ) . "\n" . $oEditReplyForm->getInput('message'),
                            1
                        )
                    );
                } else {
                    $oEditReplyForm->setValuesByArray(array(
                        'alias' => '',
                        'subject' => $subject,
                        'message' => '',
                        'notify' => 0,
                        'userfile' => '',
                        'del_file' => array()
                    ));
                }

                $this->ctrl->setParameter($this, 'pos_pk', $this->objCurrentPost->getId());
                $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentPost->getThreadId());

                $jsTpl = new ilTemplate('tpl.forum_post_quoation_ajax_handler.html', true, true, 'Modules/Forum');
                $jsTpl->setVariable(
                    'IL_FRM_QUOTE_CALLBACK_SRC',
                    $this->ctrl->getLinkTarget($this, 'getQuotationHTMLAsynch', '', true)
                );
                $this->ctrl->clearParameters($this);
                $tpl->setVariable('FORM_ADDITIONAL_JS', $jsTpl->get());
                break;

            case 'showedit':
                if ($this->ctrl->getCmd() == 'savePost') {
                    $oEditReplyForm->setValuesByPost();
                } else {
                    $oEditReplyForm->setValuesByArray(array(
                        'alias' => '',
                        'subject' => $this->objCurrentPost->getSubject(),
                        'message' => ilRTE::_replaceMediaObjectImageSrc($frm->prepareText(
                            $this->objCurrentPost->getMessage(),
                            2
                        ), 1),
                        'notify' => $this->objCurrentPost->isNotificationEnabled() ? true : false,
                        'userfile' => '',
                        'del_file' => array()
                    ));
                }
    
                $this->ctrl->setParameter($this, 'pos_pk', $this->objCurrentPost->getParentId());
                $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentPost->getThreadId());
                $jsTpl = new ilTemplate('tpl.forum_post_quoation_ajax_handler.html', true, true, 'Modules/Forum');
                $jsTpl->setVariable(
                    'IL_FRM_QUOTE_CALLBACK_SRC',
                    $this->ctrl->getLinkTarget($this, 'getQuotationHTMLAsynch', '', true)
                );
                $this->ctrl->clearParameters($this);
                $tpl->setVariable('FORM_ADDITIONAL_JS', $jsTpl->get());
                break;

            case 'editdraft':
                if (in_array($this->ctrl->getCmd(), array('saveDraft', 'updateDraft', 'publishDraft'))) {
                    $oEditReplyForm->setValuesByPost();
                } elseif (isset($_GET['draft_id']) && (int) $_GET['draft_id'] > 0) {
                    $draftObject = new ilForumPostDraft(
                        $this->user->getId(),
                        $this->objCurrentPost->getId(),
                        (int) $_GET['draft_id']
                    );
                    $oEditReplyForm->setValuesByArray(array(
                        'alias' => $draftObject->getPostUserAlias(),
                        'subject' => $draftObject->getPostSubject(),
                        'message' => ilRTE::_replaceMediaObjectImageSrc($frm->prepareText(
                            $draftObject->getPostMessage(),
                            2
                        ), 1),
                        'notify' => $draftObject->getNotify() ? true : false,
                        'userfile' => '',
                        'del_file' => []
                    ));
                }
    
                $this->ctrl->setParameter($this, 'pos_pk', $this->objCurrentPost->getId());
                $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentPost->getThreadId());
    
                $jsTpl = new ilTemplate('tpl.forum_post_quoation_ajax_handler.html', true, true, 'Modules/Forum');
                $jsTpl->setVariable(
                    'IL_FRM_QUOTE_CALLBACK_SRC',
                    $this->ctrl->getLinkTarget($this, 'getQuotationHTMLAsynch', '', true)
                );
                $this->ctrl->clearParameters($this);
                $tpl->setVariable('FORM_ADDITIONAL_JS', $jsTpl->get());
                break;
        }

        $this->ctrl->setParameter($this, 'pos_pk', $this->objCurrentPost->getId());
        $this->ctrl->setParameter($this, 'thr_pk', $this->objCurrentPost->getThreadId());
        $this->ctrl->setParameter($this, 'page', (int) $this->httpRequest->getQueryParams()['page']);
        $this->ctrl->setParameter(
            $this,
            'orderby',
            ilUtil::stripSlashes($this->httpRequest->getQueryParams()['orderby'])
        );
        $this->ctrl->setParameter(
            $this,
            'action',
            ilUtil::stripSlashes($this->httpRequest->getQueryParams()['action'])
        );
        if ($action !== 'editdraft') {
            $tpl->setVariable('FORM', $oEditReplyForm->getHTML());
        }
        $this->ctrl->clearParameters($this);
    }
}