private void SetupDocument()
        {
            if (_state.CurrentBook == null)
            {
                return;
            }

            var text  = File.ReadAllText(_state.CurrentBook.FilePath);
            var bytes = Encoding.UTF8.GetBytes(text);

            text = Encoding.UTF8.GetString(bytes);

            var paragraph = new Paragraph();

            paragraph.Inlines.Add(text);

            var document = new FlowDocument(paragraph);

            DocumentReader.SetDocument(document);
            DocumentReader.FlowDocument.PagePadding = _state.Margin;
            document.ColumnWidth   = 2000;
            document.TextAlignment = TextAlignment.Center;

            if (_state.NightMode)
            {
                DocumentReader.SetNightMode();
            }
            else
            {
                DocumentReader.SetDayMode();
            }
            _mainWindowViewModel.NightMode = _state.NightMode;

            foreach (var mark in _state.CurrentBook.Marks)
            {
                DocumentReader.RestoreMark(mark, _state.NightMode);
            }
        }