public function saveBook()
 {
     $book = Input::get('book');
     $chapters = Input::get('chapters');
     $bookMdl = Book::find($book['id']);
     $bookMdl->name = iconv('UTF-8', 'ASCII//TRANSLIT//IGNORE', $book['name']);
     $bookMdl->urlname = str_replace(' ', '-', iconv('UTF-8', 'ASCII//TRANSLIT//IGNORE', $book['name']));
     $bookMdl->save();
     foreach ($chapters as $key => $chapter) {
         if ($chapter['id']) {
             $chapMdl = Chapter::find($chapter['id']);
         } else {
             $chapMdl = new Chapter();
         }
         if ($chapter['id'] && $chapter['isDeleted']) {
             $chapMdl->delete();
         } else {
             $chapMdl->book_id = $chapter['book_id'];
             $chapMdl->title = $chapter['title'];
             $chapMdl->markerdata = count($chapter['markerdata']) ? json_encode($chapter['markerdata']) : null;
             $chapMdl->order = $chapter['order'];
             $chapMdl->save();
             if (count($chapter['elements'])) {
                 foreach ($chapter['elements'] as $key => $element) {
                     if ($element['id']) {
                         $elementMdl = Element::find($element['id']);
                     } else {
                         $elementMdl = new Element();
                     }
                     if ($element['id'] && $element['isDeleted']) {
                         $elementMdl->delete();
                     } else {
                         $elementMdl->chapter_id = $chapMdl->id ?: $element['chapter_id'];
                         $elementMdl->order = $element['order'];
                         $elementMdl->type = $element['type'];
                         if ($element['type'] == 4 || $element['type'] == 5) {
                             $elementMdl->content = json_encode($element['content']);
                         } else {
                             $elementMdl->content = $element['content'];
                         }
                         $elementMdl->note = $element['note'];
                         $elementMdl->save();
                     }
                 }
             }
         }
     }
     echo json_encode(['ok']);
 }