Nested Multi-Ring Sunburst Donut Chart

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

import { Layers } from "lucide-react";

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

interface HierarchicalItem {
    name: string;
    size: number;
}

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

const names = ["Frontend", "Backend", "Frontend.React", "Frontend.Vue", "Backend.Node", "Backend.Go"];

const colors = [
    "var(--chart-1)",
    "var(--chart-2)",
    "var(--chart-1)",
    "var(--chart-3)",
    "var(--chart-2)",
    "var(--chart-4)",
];

function generateDemoData() {
    const inner: HierarchicalItem[] = [
        { name: "Frontend", size: 60 },
        { name: "Backend", size: 40 },
    ];
    const outer: HierarchicalItem[] = [
        { name: "Frontend.React", size: 40 },
        { name: "Frontend.Vue", size: 20 },
        { name: "Backend.Node", size: 25 },
        { name: "Backend.Go", size: 15 },
    ];
    return { inner, outer };
}

function shadcnTooltipContent<TDatum>(points: readonly ChartPoint<TDatum>[]) {
    if (points.length === 0) return { title: "", rows: [] };
    const d = points[0].datum as HierarchicalItem;
    if (!d) return { title: "", rows: [] };
    return {
        title: d.name,
        rows: [{ label: "Proportional Size", value: `${d.size} units`, color: "var(--chart-1)" }],
    };
}

export function NestedDonut() {
    const data = useMemo(() => generateDemoData(), []);

    const definition = useMemo(() => {
        const innerArcs = pie(data.inner, { value: "size" });
        const outerArcs = pie(data.outer, { value: "size" });

        return defineChart(
            {
                renderer: motionRenderer,
                scales: {
                    x: null,
                    y: null,
                },
                marks: [
                    polar({
                        radiusRatio: 0.8,
                        scales: {
                            angle: null,
                            radius: null,
                        },
                        marks: [
                            radialArc(innerArcs, {
                                id: "family-slices",
                                key: "name",
                                innerRadius: ({ radius }) => radius * 0.15,
                                outerRadius: ({ radius }) => radius * 0.48,
                                color: "name",
                            }),
                            radialArc(outerArcs, {
                                id: "detail-slices",
                                key: "name",
                                innerRadius: ({ radius }) => radius * 0.55,
                                color: "name",
                            }),
                        ],
                    }),
                ],
                color: { domain: names, range: colors },
                margin: { top: 20, right: 20, bottom: 20, left: 20 },
                theme: {
                    foreground: "var(--muted-foreground)",
                    grid: "var(--border)",
                    background: "transparent",
                },
            },
            {
                keyboard: true,
                tooltip: {
                    use: tooltip,
                    className: "font-sans shadow-none rounded-md bg-popover text-popover-foreground border p-2 text-xs",
                    anchor: "pointer",
                    placement: "auto",
                    content: (points) => shadcnTooltipContent(points),
                },
            },
        );
    }, [data]);

    return (
        <Card className="w-full max-w-xl">
            <CardHeader>
                <CardTitle>Nested Multi-Ring Sunburst Donut Chart</CardTitle>
                <CardDescription>
                    Concentric multi-level donut rings representing parent category and sub-item proportions
                </CardDescription>
            </CardHeader>
            <CardContent>
                <div className="h-[250px] w-full">
                    <Chart
                        definition={definition}
                        renderer={motionRenderer}
                        height={250}
                        ariaLabel="Nested Multi-Ring Sunburst Donut Chart"
                    />
                </div>
            </CardContent>
            <CardFooter className="flex-col items-start gap-2 text-sm">
                <div className="flex items-center gap-2 leading-none font-medium">
                    Inner ring maps major categories, outer ring breaks down sub-components{" "}
                    <Layers className="h-4 w-4 text-emerald-500" />
                </div>
                <div className="text-muted-foreground leading-none">
                    Multiple `radialArc` layers with distinct inner/outer radii compose sunburst rings
                </div>
            </CardFooter>
        </Card>
    );
}

export default NestedDonut;