/**
  * Default single discussion display.
  *
  * @since 2.0.0
  * @access public
  *
  * @param int $DiscussionID Unique discussion ID
  * @param string $DiscussionStub URL-safe title slug
  * @param int $Page The current page of comments
  */
 public function Index($DiscussionID = '', $DiscussionStub = '', $Page = '')
 {
     // Setup head
     $Session = Gdn::Session();
     $this->AddJsFile('jquery.autosize.min.js');
     $this->AddJsFile('discussion.js');
     $this->AddJsFile('autosave.js');
     Gdn_Theme::Section('Discussion');
     // Load the discussion record
     $DiscussionID = is_numeric($DiscussionID) && $DiscussionID > 0 ? $DiscussionID : 0;
     if (!array_key_exists('Discussion', $this->Data)) {
         $this->SetData('Discussion', $this->DiscussionModel->GetID($DiscussionID), TRUE);
     }
     if (!is_object($this->Discussion)) {
         throw new Exception(sprintf(T('%s Not Found'), T('Discussion')), 404);
     }
     // Define the query offset & limit.
     $Limit = C('Vanilla.Comments.PerPage', 30);
     $OffsetProvided = $Page != '';
     list($Offset, $Limit) = OffsetLimit($Page, $Limit);
     // Check permissions
     $this->Permission('Vanilla.Discussions.View', TRUE, 'Category', $this->Discussion->PermissionCategoryID);
     $this->SetData('CategoryID', $this->CategoryID = $this->Discussion->CategoryID, TRUE);
     if (strcasecmp(GetValue('Type', $this->Discussion), 'redirect') === 0) {
         $this->RedirectDiscussion($this->Discussion);
     }
     $Category = CategoryModel::Categories($this->Discussion->CategoryID);
     $this->SetData('Category', $Category);
     if ($CategoryCssClass = GetValue('CssClass', $Category)) {
         Gdn_Theme::Section($CategoryCssClass);
     }
     $this->SetData('Breadcrumbs', CategoryModel::GetAncestors($this->CategoryID));
     // Setup
     $this->Title($this->Discussion->Name);
     // Actual number of comments, excluding the discussion itself.
     $ActualResponses = $this->Discussion->CountComments;
     $this->Offset = $Offset;
     if (C('Vanilla.Comments.AutoOffset')) {
         //         if ($this->Discussion->CountCommentWatch > 1 && $OffsetProvided == '')
         //            $this->AddDefinition('ScrollTo', 'a[name=Item_'.$this->Discussion->CountCommentWatch.']');
         if (!is_numeric($this->Offset) || $this->Offset < 0 || !$OffsetProvided) {
             // Round down to the appropriate offset based on the user's read comments & comments per page
             $CountCommentWatch = $this->Discussion->CountCommentWatch > 0 ? $this->Discussion->CountCommentWatch : 0;
             if ($CountCommentWatch > $ActualResponses) {
                 $CountCommentWatch = $ActualResponses;
             }
             // (((67 comments / 10 perpage) = 6.7) rounded down = 6) * 10 perpage = offset 60;
             $this->Offset = floor($CountCommentWatch / $Limit) * $Limit;
         }
         if ($ActualResponses <= $Limit) {
             $this->Offset = 0;
         }
         if ($this->Offset == $ActualResponses) {
             $this->Offset -= $Limit;
         }
     } else {
         if ($this->Offset == '') {
             $this->Offset = 0;
         }
     }
     if ($this->Offset < 0) {
         $this->Offset = 0;
     }
     $LatestItem = $this->Discussion->CountCommentWatch;
     if ($LatestItem === NULL) {
         $LatestItem = 0;
     } elseif ($LatestItem < $this->Discussion->CountComments) {
         $LatestItem += 1;
     }
     $this->SetData('_LatestItem', $LatestItem);
     // Set the canonical url to have the proper page title.
     $this->CanonicalUrl(DiscussionUrl($this->Discussion, PageNumber($this->Offset, $Limit, 0, FALSE)));
     //      Url(ConcatSep('/', 'discussion/'.$this->Discussion->DiscussionID.'/'. Gdn_Format::Url($this->Discussion->Name), PageNumber($this->Offset, $Limit, TRUE, Gdn::Session()->UserID != 0)), TRUE), Gdn::Session()->UserID == 0);
     // Load the comments
     $this->SetData('Comments', $this->CommentModel->Get($DiscussionID, $Limit, $this->Offset));
     $PageNumber = PageNumber($this->Offset, $Limit);
     $this->SetData('Page', $PageNumber);
     $this->_SetOpenGraph();
     include_once PATH_LIBRARY . '/vendors/simplehtmldom/simple_html_dom.php';
     if ($PageNumber == 1) {
         $this->Description(SliceParagraph(Gdn_Format::PlainText($this->Discussion->Body, $this->Discussion->Format), 160));
         // Add images to head for open graph
         $Dom = str_get_html(Gdn_Format::To($this->Discussion->Body, $this->Discussion->Format));
     } else {
         $this->Data['Title'] .= sprintf(T(' - Page %s'), PageNumber($this->Offset, $Limit));
         $FirstComment = $this->Data('Comments')->FirstRow();
         $FirstBody = GetValue('Body', $FirstComment);
         $FirstFormat = GetValue('Format', $FirstComment);
         $this->Description(SliceParagraph(Gdn_Format::PlainText($FirstBody, $FirstFormat), 160));
         // Add images to head for open graph
         $Dom = str_get_html(Gdn_Format::To($FirstBody, $FirstFormat));
     }
     if ($Dom) {
         foreach ($Dom->find('img') as $img) {
             if (isset($img->src)) {
                 $this->Image($img->src);
             }
         }
     }
     // Queue notification.
     if ($this->Request->Get('new') && C('Vanilla.QueueNotifications')) {
         $this->AddDefinition('NotifyNewDiscussion', 1);
     }
     // Make sure to set the user's discussion watch records
     $this->CommentModel->SetWatch($this->Discussion, $Limit, $this->Offset, $this->Discussion->CountComments);
     // Build a pager
     $PagerFactory = new Gdn_PagerFactory();
     $this->EventArguments['PagerType'] = 'Pager';
     $this->FireEvent('BeforeBuildPager');
     $this->Pager = $PagerFactory->GetPager($this->EventArguments['PagerType'], $this);
     $this->Pager->ClientID = 'Pager';
     $this->Pager->Configure($this->Offset, $Limit, $ActualResponses, array('DiscussionUrl'));
     $this->Pager->Record = $this->Discussion;
     PagerModule::Current($this->Pager);
     $this->FireEvent('AfterBuildPager');
     // Define the form for the comment input
     $this->Form = Gdn::Factory('Form', 'Comment');
     $this->Form->Action = Url('/vanilla/post/comment/');
     $this->DiscussionID = $this->Discussion->DiscussionID;
     $this->Form->AddHidden('DiscussionID', $this->DiscussionID);
     $this->Form->AddHidden('CommentID', '');
     // Look in the session stash for a comment
     $StashComment = $Session->Stash('CommentForDiscussionID_' . $this->Discussion->DiscussionID, '', FALSE);
     if ($StashComment) {
         $this->Form->SetFormValue('Body', $StashComment);
     }
     // Retrieve & apply the draft if there is one:
     if (Gdn::Session()->UserID) {
         $DraftModel = new DraftModel();
         $Draft = $DraftModel->Get($Session->UserID, 0, 1, $this->Discussion->DiscussionID)->FirstRow();
         $this->Form->AddHidden('DraftID', $Draft ? $Draft->DraftID : '');
         if ($Draft && !$this->Form->IsPostBack()) {
             $this->Form->SetValue('Body', $Draft->Body);
             $this->Form->SetValue('Format', $Draft->Format);
         }
     }
     // Deliver JSON data if necessary
     if ($this->_DeliveryType != DELIVERY_TYPE_ALL) {
         $this->SetJson('LessRow', $this->Pager->ToString('less'));
         $this->SetJson('MoreRow', $this->Pager->ToString('more'));
         $this->View = 'comments';
     }
     // Inform moderator of checked comments in this discussion
     $CheckedComments = $Session->GetAttribute('CheckedComments', array());
     if (count($CheckedComments) > 0) {
         ModerationController::InformCheckedComments($this);
     }
     // Add modules
     $this->AddModule('DiscussionFilterModule');
     $this->AddModule('NewDiscussionModule');
     $this->AddModule('CategoriesModule');
     $this->AddModule('BookmarkedModule');
     $this->CanEditComments = Gdn::Session()->CheckPermission('Vanilla.Comments.Edit', TRUE, 'Category', 'any') && C('Vanilla.AdminCheckboxes.Use');
     // Report the discussion id so js can use it.
     $this->AddDefinition('DiscussionID', $DiscussionID);
     $this->FireEvent('BeforeDiscussionRender');
     $AttachmentModel = AttachmentModel::Instance();
     if (AttachmentModel::Enabled()) {
         $AttachmentModel->JoinAttachments($this->Data['Discussion'], $this->Data['Comments']);
         $this->FireEvent('FetchAttachmentViews');
         if ($this->DeliveryMethod() === DELIVERY_METHOD_XHTML) {
             require_once $this->FetchViewLocation('attachment', 'attachments', 'dashboard');
         }
     }
     $this->Render();
 }