/**
  * Detail view of a mail
  */
 public function showMail()
 {
     /**
      * @var $ilUser ilObjUser
      * @var $ilToolbar ilToolbarGUI
      * @var $ilTabs ilTabsGUI
      */
     global $ilUser, $ilToolbar, $ilTabs;
     if ($_SESSION['mail_id']) {
         $_GET['mail_id'] = $_SESSION['mail_id'];
         $_SESSION['mail_id'] = '';
     }
     $ilTabs->clearTargets();
     $ilTabs->setBackTarget($this->lng->txt('back_to_folder'), $this->ctrl->getFormAction($this, 'showFolder'));
     $this->umail->markRead(array((int) $_GET['mail_id']));
     $mailData = $this->umail->getMail((int) $_GET['mail_id']);
     $this->tpl->setTitle($this->lng->txt('mail_mails_of'));
     require_once 'Services/Form/classes/class.ilPropertyFormGUI.php';
     $form = new ilPropertyFormGUI();
     $form->setPreventDoubleSubmission(false);
     $form->setTableWidth('100%');
     $this->ctrl->setParameter($this, 'mail_id', (int) $_GET['mail_id']);
     $form->setFormAction($this->ctrl->getFormAction($this, 'showMail'));
     $this->ctrl->clearParameters($this);
     $form->setTitle($this->lng->txt('mail_mails_of'));
     if ('tree' == ilSession::get(ilMailGUI::VIEWMODE_SESSION_KEY)) {
         $this->tpl->setVariable('FORM_TARGET', ilFrameTargetInfo::_getFrame('MainContent'));
     }
     include_once 'Services/Accessibility/classes/class.ilAccessKeyGUI.php';
     /**
      * @var $sender ilObjUser
      */
     $sender = ilObjectFactory::getInstanceByObjId($mailData['sender_id'], false);
     if ($sender && $sender->getId() && $sender->getId() != ANONYMOUS_USER_ID) {
         $this->ctrl->setParameterByClass('ilmailformgui', 'mail_id', (int) $_GET['mail_id']);
         $this->ctrl->setParameterByClass('ilmailformgui', 'type', 'reply');
         $this->ctrl->clearParametersByClass('iliasmailformgui');
         $ilToolbar->addButton($this->lng->txt('reply'), $this->ctrl->getLinkTargetByClass('ilmailformgui'), '', ilAccessKey::REPLY);
         $this->ctrl->clearParameters($this);
     }
     $this->ctrl->setParameterByClass('ilmailformgui', 'mail_id', (int) $_GET['mail_id']);
     $this->ctrl->setParameterByClass('ilmailformgui', 'type', 'forward');
     $this->ctrl->clearParametersByClass('iliasmailformgui');
     $ilToolbar->addButton($this->lng->txt('forward'), $this->ctrl->getLinkTargetByClass('ilmailformgui'), '', ilAccessKey::FORWARD_MAIL);
     $this->ctrl->clearParameters($this);
     $this->ctrl->setParameter($this, 'mail_id', (int) $_GET['mail_id']);
     $ilToolbar->addButton($this->lng->txt('print'), $this->ctrl->getLinkTarget($this, 'printMail'), '_blank');
     $this->ctrl->clearParameters($this);
     $this->ctrl->setParameter($this, 'mail_id', (int) $_GET['mail_id']);
     $this->ctrl->setParameter($this, 'selected_cmd', 'deleteMails');
     $ilToolbar->addButton($this->lng->txt('delete'), $this->ctrl->getLinkTarget($this), '', ilAccessKey::DELETE);
     $this->ctrl->clearParameters($this);
     if ($sender && $sender->getId() && $sender->getId() != ANONYMOUS_USER_ID) {
         $linked_fullname = $sender->getPublicName();
         $picture = ilUtil::img($sender->getPersonalPicturePath('xsmall'), $sender->getPublicName());
         $add_to_addb_button = '';
         if (in_array(ilObjUser::_lookupPref($sender->getId(), 'public_profile'), array('y', 'g'))) {
             $this->ctrl->setParameter($this, 'mail_id', (int) $_GET['mail_id']);
             $this->ctrl->setParameter($this, 'user', $sender->getId());
             $linked_fullname = '<br /><a href="' . $this->ctrl->getLinkTarget($this, 'showUser') . '" title="' . $linked_fullname . '">' . $linked_fullname . '</a>';
             $this->ctrl->clearParameters($this);
         }
         if ($sender->getId() != $ilUser->getId()) {
             require_once 'Services/Contact/classes/class.ilAddressbook.php';
             $abook = new ilAddressbook($ilUser->getId());
             if ($abook->checkEntryByLogin($sender->getLogin()) == 0) {
                 $tplbtn = new ilTemplate('tpl.buttons.html', true, true);
                 $tplbtn->setCurrentBlock('btn_cell');
                 $this->ctrl->setParameter($this, 'mail_id', (int) $_GET['mail_id']);
                 $tplbtn->setVariable('BTN_LINK', $this->ctrl->getLinkTarget($this, 'add'));
                 $this->ctrl->clearParameters($this);
                 $tplbtn->setVariable('BTN_TXT', $this->lng->txt('mail_add_to_addressbook'));
                 $tplbtn->parseCurrentBlock();
                 $add_to_addb_button = '<br />' . $tplbtn->get();
             }
         }
         $from = new ilCustomInputGUI($this->lng->txt('from'));
         $from->setHtml($picture . ' ' . $linked_fullname . $add_to_addb_button);
         $form->addItem($from);
     } else {
         if (!$sender || !$sender->getId()) {
             $from = new ilCustomInputGUI($this->lng->txt('from'));
             $from->setHtml($mailData['import_name'] . ' (' . $this->lng->txt('user_deleted') . ')');
             $form->addItem($from);
         } else {
             $from = new ilCustomInputGUI($this->lng->txt('from'));
             $from->setHtml(ilUtil::img(ilUtil::getImagePath('HeaderIconAvatar.svg'), ilMail::_getIliasMailerName()) . '<br />' . ilMail::_getIliasMailerName());
             $form->addItem($from);
         }
     }
     $to = new ilCustomInputGUI($this->lng->txt('mail_to'));
     $to->setHtml(ilUtil::htmlencodePlainString($this->umail->formatNamesForOutput($mailData['rcp_to']), false));
     $form->addItem($to);
     if ($mailData['rcp_cc']) {
         $cc = new ilCustomInputGUI($this->lng->txt('cc'));
         $cc->setHtml(ilUtil::htmlencodePlainString($this->umail->formatNamesForOutput($mailData['rcp_cc']), false));
         $form->addItem($cc);
     }
     if ($mailData['rcp_bcc']) {
         $bcc = new ilCustomInputGUI($this->lng->txt('bc'));
         $bcc->setHtml(ilUtil::htmlencodePlainString($this->umail->formatNamesForOutput($mailData['rcp_bcc']), false));
         $form->addItem($bcc);
     }
     $subject = new ilCustomInputGUI($this->lng->txt('subject'));
     $subject->setHtml(ilUtil::htmlencodePlainString($mailData['m_subject'], true));
     $form->addItem($subject);
     $date = new ilCustomInputGUI($this->lng->txt('date'));
     $date->setHtml(ilDatePresentation::formatDate(new ilDateTime($mailData['send_time'], IL_CAL_DATETIME)));
     $form->addItem($date);
     $message = new ilCustomInputGUI($this->lng->txt('message'));
     $message->setHtml(ilUtil::htmlencodePlainString($mailData['m_message'], true));
     $form->addItem($message);
     if ($mailData['attachments']) {
         $att = new ilCustomInputGUI($this->lng->txt('attachments'));
         $radiog = new ilRadioGroupInputGUI('', 'filename');
         foreach ($mailData['attachments'] as $file) {
             $radiog->addOption(new ilRadioOption($file, md5($file)));
         }
         $att->setHtml($radiog->render());
         $form->addCommandButton('deliverFile', $this->lng->txt('download'));
         $form->addItem($att);
     }
     $isTrashFolder = false;
     if ($this->mbox->getTrashFolder() == $_GET['mobj_id']) {
         $isTrashFolder = true;
     }
     $current_folder_data = $this->mbox->getFolderData((int) $_GET['mobj_id']);
     $selectOptions = array();
     $actions = $this->mbox->getActions((int) $_GET["mobj_id"]);
     foreach ($actions as $key => $action) {
         if ($key == 'moveMails') {
             $folders = $this->mbox->getSubFolders();
             foreach ($folders as $folder) {
                 if (($folder["type"] != 'trash' || !$isTrashFolder) && $folder['obj_id'] != $current_folder_data['obj_id']) {
                     $optionText = '';
                     if ($folder['type'] != 'user_folder') {
                         $optionText = $action . ' ' . $this->lng->txt('mail_' . $folder['title']) . ($folder['type'] == 'trash' ? ' (' . $this->lng->txt('delete') . ')' : '');
                     } else {
                         $optionText = $action . ' ' . $folder['title'];
                     }
                     $selectOptions[$folder['obj_id']] = $optionText;
                 }
             }
         }
     }
     if ($current_folder_data['type'] == 'user_folder') {
         $txt_folder = $current_folder_data['title'];
     } else {
         $txt_folder = $this->lng->txt('mail_' . $current_folder_data['title']);
     }
     $ilToolbar->addSeparator();
     $ilToolbar->addText(sprintf($this->lng->txt('current_folder'), $txt_folder));
     if (is_array($selectOptions) && count($selectOptions)) {
         include_once 'Services/Form/classes/class.ilSelectInputGUI.php';
         $actions = new ilSelectInputGUI('', 'selected_cmd');
         $actions->setOptions($selectOptions);
         $this->ctrl->setParameter($this, 'mail_id', (int) $_GET['mail_id']);
         $ilToolbar->setFormAction($this->ctrl->getFormAction($this, 'showMail'));
         $ilToolbar->addInputItem($actions);
         $ilToolbar->addFormButton($this->lng->txt('submit'), 'changeFolder');
     }
     // Navigation
     $prevMail = $this->umail->getPreviousMail((int) $_GET['mail_id']);
     $nextMail = $this->umail->getNextMail((int) $_GET['mail_id']);
     if (is_array($prevMail) || is_array($nextMail)) {
         $ilToolbar->addSeparator();
         if ($prevMail['mail_id']) {
             $this->ctrl->setParameter($this, 'mail_id', $prevMail['mail_id']);
             $ilToolbar->addButton($this->lng->txt('previous'), $this->ctrl->getLinkTarget($this, 'showMail'));
             $this->ctrl->clearParameters($this);
         }
         if ($nextMail['mail_id']) {
             $this->ctrl->setParameter($this, 'mail_id', $nextMail['mail_id']);
             $ilToolbar->addButton($this->lng->txt('next'), $this->ctrl->getLinkTarget($this, 'showMail'));
             $this->ctrl->clearParameters($this);
         }
     }
     $this->tpl->setContent($form->getHTML());
     $this->tpl->show();
 }