pub fn overview_graph(

    summaries: BTreeMap<usize, Vec<BTreeMap<&'static str, Duration>>>,

    plot_dir: impl AsRef<Path>,

) {

    let chart_path = plot_dir.as_ref().join("Overview.png");

    let chart_root = BitMapBackend::new(&chart_path, (800, 480)).into_drawing_area();

    chart_root.fill(&BACKGROUND_COLOR).unwrap();

    let mut results_by_backend = BTreeMap::new();

    let highest_concurrency = *summaries.keys().max().unwrap();

    for (concurrency, reports) in summaries {

        for report in reports {

            for (backend, wall_time) in report {

                let results = results_by_backend

                    .entry(backend)

                    .or_insert_with(BTreeMap::new);

                results

                    .entry(concurrency)

                    .and_modify(|total: &mut Nanos| total.0 += wall_time.as_nanos() as u64)

                    .or_insert_with(|| Nanos(wall_time.as_nanos() as u64));

            }

    let longest_measurement = Iterator::max(

        results_by_backend

            .values()

            .flat_map(|results| results.values().copied()),

    )

    .unwrap();

    let mut chart = ChartBuilder::on(&chart_root)

        .caption(

            "Commerce Benchmark Suite Overview",

            ("sans-serif", 30., &TEXT_COLOR),

        )

        .margin_left(10)

        .margin_right(50)

        .margin_bottom(10)

        .x_label_area_size(50)

        .y_label_area_size(80)

        .build_cartesian_2d(

            1..highest_concurrency,

            NanosRange(Nanos(0)..=longest_measurement),

        )

        .unwrap();

    chart

        .configure_mesh()

        .disable_x_mesh()

        .x_desc("Number of Agents")

        .y_desc("Total Wall Time")

        .axis_desc_style(("sans-serif", 15, &TEXT_COLOR))

        .x_label_style(&TEXT_COLOR)

        .y_label_style(&TEXT_COLOR)

        .light_line_style(&TEXT_COLOR.mix(0.1))

        .bold_line_style(&TEXT_COLOR.mix(0.3))

        .draw()

        .unwrap();

    for (backend, points) in results_by_backend {

        chart

            .draw_series(LineSeries::new(

                points.into_iter(),

                &label_to_color(backend),

            ))

            .unwrap()

            .label(backend.to_string())

            .legend(|(x, y)| PathElement::new(vec![(x, y), (x + 20, y)], &label_to_color(backend)));

    }

    chart

        .configure_series_labels()

        .border_style(&TEXT_COLOR)

        .background_style(&BACKGROUND_COLOR)

        .label_font(&TEXT_COLOR)

        .position(SeriesLabelPosition::UpperLeft)

        .draw()

        .unwrap();

    chart_root.present().unwrap();

}

#[derive(Debug, Clone, Copy, Ord, PartialOrd, Eq, PartialEq)]

    fn format(value: &Nanos) -> String {

        format_nanoseconds(value.0 as f64)

    }

    fn map(&self, value: &Self::ValueType, limit: (i32, i32)) -> i32 {

        let limited_size = limit.1 - limit.0;

        let full_size = self.0.end().0 + 1 - self.0.start().0;

        let normalized_offset = value.0.saturating_sub(self.0.start().0) as f64 / full_size as f64;

        limit.0 + (normalized_offset * limited_size as f64) as i32

    }

    fn key_points<Hint: plotters::coord::ranged1d::KeyPointHint>(

        &self,

        hint: Hint,

    ) -> Vec<Self::ValueType> {

        let total_range = self.0.end().0 - self.0.start().0;

        let num_points = hint.max_num_points();

        let mut important_points = Vec::with_capacity(num_points);

        important_points.push(*self.0.start());

        if num_points > 2 {

            let steps = num_points - 2;

            let step_size = total_range as f64 / steps as f64;

            important_points.extend(

                (1..num_points - 1)

                    .map(|step| Nanos(self.0.start().0 + (step as f64 * step_size) as u64)),

            );

        }

        important_points.push(*self.0.end());

        important_points

    }

pub fn label_to_color(label: &str) -> RGBColor {

    match label {

        "bonsaidb-local" => COLORS[0],

        "bonsaidb-quic" => COLORS[1],

        "bonsaidb-ws" => COLORS[2],

        "postgresql" => COLORS[3],

}