protected function prepareChartData(StatsTable $stats)
    {
        $totals = $stats->totals()->all();

        return json_encode([
            'labels'   => Arr::pluck($totals, 'label'),
            'datasets' => [
                [
                    'data'                 => Arr::pluck($totals, 'value'),
                    'backgroundColor'      => Arr::pluck($totals, 'color'),
                    'hoverBackgroundColor' => Arr::pluck($totals, 'highlight'),
                ],
            ],
        ]);
    }