Radial Chart Label

import { type ChartPoint, defineChart } from "@tanstack/charts";
import { motion } from "@tanstack/charts/motion";
import { focusGroupAngle, polar, radialBarAngle, radialText } from "@tanstack/charts/polar";
import { tooltip } from "@tanstack/charts/tooltip";
import { Chart } from "@tanstack/react-charts/core";
import { useMemo } from "react";

import { scaleBand, scaleLinear } from "d3-scale";
import { TrendingUp } from "lucide-react";

import { Card, CardContent, CardDescription, CardFooter, CardHeader, CardTitle } from "@/components/ui/card";

function generateDemoData() {
    return [
        { browser: "chrome", visitors: 275, fill: "var(--chart-1)" },
        { browser: "safari", visitors: 200, fill: "var(--chart-2)" },
        { browser: "firefox", visitors: 187, fill: "var(--chart-3)" },
        { browser: "edge", visitors: 173, fill: "var(--chart-4)" },
        { browser: "other", visitors: 90, fill: "var(--chart-5)" },
    ];
}

const motionRenderer = motion({
    initial: "always",
    transition: { type: "spring", stiffness: 170, damping: 18, mass: 1 },
});

function rechartsPolarAngle(degrees: number) {
    return ((90 - degrees) * Math.PI) / 180;
}

function titleCase(value: string) {
    return value.charAt(0).toUpperCase() + value.slice(1);
}

function browserMetric(datum: unknown) {
    if (!datum || typeof datum !== "object") return undefined;
    const browser = Reflect.get(datum, "browser");
    const visitors = Reflect.get(datum, "visitors");
    return typeof browser === "string" && typeof visitors === "number" && Number.isFinite(visitors)
        ? { browser, visitors }
        : undefined;
}

function shadcnTooltipContent<TDatum>(points: readonly ChartPoint<TDatum>[]) {
    const point = points.find((candidate) => browserMetric(candidate.datum));
    const metric = point && browserMetric(point.datum);
    return metric
        ? {
              title: titleCase(metric.browser),
              rows: [
                  {
                      label: "Visitors",
                      value: metric.visitors.toLocaleString("en-US"),
                      color: point.color,
                  },
              ],
          }
        : { rows: [] };
}

export function RadialLabel() {
    const data = useMemo(() => generateDemoData(), []);
    const browserNames = useMemo(() => data.map((row) => row.browser), [data]);
    const chartColors = useMemo(() => data.map((row) => row.fill), [data]);

    const definition = useMemo(() => {
        const startAngle = rechartsPolarAngle(-90);
        const endAngle = rechartsPolarAngle(380);
        const backgroundRows = data.map((row) => ({
            ...row,
            background: 300,
        }));

        return defineChart(
            ({ height }) => ({
                scales: {
                    x: null,
                    y: null,
                },
                marks: [
                    polar({
                        radiusRatio: 1,
                        startAngle,
                        endAngle,
                        scales: {
                            angle: { scale: scaleLinear().domain([0, 300]) },
                            radius: {
                                scale: scaleBand<string>().domain(browserNames).paddingInner(0.2),
                                range: [30 * (height < 220 ? 0.8 : 1), 110 * (height < 220 ? 0.8 : 1)],
                            },
                        },
                        guides: [],
                        marks: [
                            radialBarAngle(backgroundRows, {
                                id: "radial-backgrounds",
                                angle: "background",
                                radius: "browser",
                                key: "browser",
                                fill: "var(--muted)",
                            }),
                            radialBarAngle(data, {
                                id: "radial-values",
                                angle: "visitors",
                                radius: "browser",
                                key: "browser",
                                fill: (row) => row.fill,
                            }),
                        ],
                    }),
                    polar({
                        startAngle,
                        endAngle,
                        scales: {
                            angle: { scale: scaleLinear().domain([0, 300]) },
                            radius: {
                                scale: scaleLinear().domain([0, 110]),
                                range: [0, 110 * (height < 220 ? 0.8 : 1)],
                            },
                        },
                        marks: [
                            radialText(
                                data.map((row, index) => ({
                                    ...row,
                                    angle: 10,
                                    labelRadius: 38 + index * 16,
                                })),
                                {
                                    id: "radial-labels",
                                    angle: "angle",
                                    radius: "labelRadius",
                                    key: "browser",
                                    text: (row) => titleCase(row.browser),
                                    fill: "white",
                                    fontSize: 11,
                                    rotate: -25,
                                },
                            ),
                        ],
                    }),
                ],
                color: { domain: browserNames, range: chartColors },
                margin: 0,
            }),
            {
                focus: focusGroupAngle,
                keyboard: false,
                tooltip: {
                    use: tooltip,
                    motion: { type: "spring", stiffness: 170, damping: 18 },
                    className: "font-sans shadow-none rounded-md bg-popover text-popover-foreground border p-2 text-xs",
                    anchor: "group-center",
                    placement: "auto",
                    sort: "color-domain",
                    content: (points) => shadcnTooltipContent(points),
                },
            },
        );
    }, [data, browserNames, chartColors]);

    return (
        <Card className="flex w-full max-w-md flex-col">
            <CardHeader className="items-center pb-4">
                <CardTitle>Customer Satisfaction Index (CSAT)</CardTitle>
                <CardDescription>Positive survey sentiment percentage for H1 2024</CardDescription>
            </CardHeader>
            <CardContent className="pb-0">
                <div className="mx-auto flex aspect-square max-h-[250px] w-full items-center justify-center">
                    <Chart
                        definition={definition}
                        renderer={motionRenderer}
                        initialWidth={250}
                        height={250}
                        ariaLabel="Customer Satisfaction Index Chart"
                    />
                </div>
            </CardContent>
            <CardFooter className="flex-col gap-2 pt-4 text-sm">
                <div className="flex items-center gap-2 leading-none font-medium">
                    CSAT score increased by 5.2% this month <TrendingUp className="h-4 w-4 text-emerald-500" />
                </div>
                <div className="text-muted-foreground flex items-center gap-2 leading-none">
                    Showing total visitors for the last 6 months
                </div>
            </CardFooter>
        </Card>
    );
}

export default RadialLabel;