Concentric Circular Radial Metric Bars

import { type ChartPoint, defineChart } from "@tanstack/charts";
import { motion } from "@tanstack/charts/motion";
import { polar, radialBarAngle } 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 { CircleDot } from "lucide-react";

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

interface RadialMetric {
    category: string;
    value: number;
}

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

const categories = ["Activity Goal", "Calorie Burn", "Hydration", "Sleep Quality"];
const colors = ["var(--chart-1)", "var(--chart-2)", "var(--chart-3)", "var(--chart-4)"];

function generateDemoData(): RadialMetric[] {
    return [
        { category: "Activity Goal", value: 85 },
        { category: "Calorie Burn", value: 65 },
        { category: "Hydration", value: 90 },
        { category: "Sleep Quality", value: 75 },
    ];
}

function shadcnTooltipContent<TDatum>(points: readonly ChartPoint<TDatum>[]) {
    if (points.length === 0) return { title: "", rows: [] };
    const d = points[0].datum as RadialMetric;
    if (!d) return { title: "", rows: [] };
    return {
        title: d.category,
        rows: [{ label: "Target Completion", value: `${d.value}%`, color: "var(--chart-1)" }],
    };
}

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

    const definition = useMemo(
        () =>
            defineChart(
                {
                    renderer: motionRenderer,
                    scales: {
                        x: null,
                        y: null,
                    },
                    marks: [
                        polar({
                            radiusRatio: 0.82,
                            scales: {
                                angle: {
                                    scale: scaleLinear().domain([0, 100]),
                                },
                                radius: {
                                    scale: () =>
                                        scaleBand<string>().domain(categories).paddingInner(0.35).paddingOuter(0.15),
                                    range: [({ radius }) => radius * 0.2, ({ radius }) => radius],
                                },
                            },
                            marks: [
                                radialBarAngle(data, {
                                    id: "category-bars",
                                    angle: "value",
                                    radius: "category",
                                    key: "category",
                                    color: "category",
                                    cornerRadius: "full",
                                }),
                            ],
                        }),
                    ],
                    color: { domain: categories, 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>Concentric Circular Radial Metric Bars</CardTitle>
                <CardDescription>
                    Concentric stacked rings with rounded pill caps tracking progress metrics
                </CardDescription>
            </CardHeader>
            <CardContent>
                <div className="h-[250px] w-full">
                    <Chart
                        definition={definition}
                        renderer={motionRenderer}
                        height={250}
                        ariaLabel="Concentric Circular Radial Metric Bars Chart"
                    />
                </div>
            </CardContent>
            <CardFooter className="flex-col items-start gap-2 text-sm">
                <div className="flex items-center gap-2 leading-none font-medium">
                    Apple Watch-style concentric progress rings with pill caps{" "}
                    <CircleDot className="h-4 w-4 text-emerald-500" />
                </div>
                <div className="text-muted-foreground leading-none">
                    `radialBarAngle` maps values to arc angles across nested band scale radiuses
                </div>
            </CardFooter>
        </Card>
    );
}

export default RadialBars;