Radar Chart

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

import { scaleLinear, scalePoint } from "d3-scale";
import { curveLinearClosed } from "d3-shape";
import { Compass } from "lucide-react";

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

interface SkillDatum {
    skill: string;
    score: number;
}

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

const radarSkills = ["Speed", "Endurance", "Strength", "Agility", "Flexibility", "Precision"];

function generateDemoData(): SkillDatum[] {
    const scores = [85, 92, 78, 88, 70, 95];
    return radarSkills.map((skill, idx) => ({
        skill,
        score: scores[idx] / 100,
    }));
}

function shadcnTooltipContent<TDatum>(points: readonly ChartPoint<TDatum>[]) {
    if (points.length === 0) return { title: "", rows: [] };
    const d = points[0].datum as SkillDatum;
    if (!d) return { title: "", rows: [] };
    return {
        title: d.skill,
        rows: [{ label: "Performance Score", value: `${(d.score * 100).toFixed(0)}%`, color: "var(--chart-1)" }],
    };
}

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

    const angleScale = useMemo(() => scalePoint<string>().domain(radarSkills), []);
    const radiusScale = useMemo(() => scaleLinear().domain([0, 1]), []);

    const definition = useMemo(
        () =>
            defineChart(
                {
                    renderer: motionRenderer,
                    scales: {
                        x: null,
                        y: null,
                    },
                    marks: [
                        polar({
                            scales: {
                                angle: { scale: angleScale, wrap: true },
                                radius: { scale: radiusScale },
                            },
                            inset: 0,
                            radiusRatio: 0.8,
                            guides: [
                                radialGrid({
                                    values: [0.2, 0.4, 0.6, 0.8, 1],
                                    shape: "polygon",
                                    labels: true,
                                    labelFontSize: 10,
                                    format: (v) => `${Math.round(Number(v) * 100)}%`,
                                    labelFill: "var(--muted-foreground)",
                                    stroke: "var(--border)",
                                }),
                                angleGrid({
                                    values: radarSkills,
                                    labels: true,
                                    labelOffset: 10,
                                    labelFill: "var(--foreground)",
                                    labelFontSize: 11,
                                    format: String,
                                    stroke: "var(--border)",
                                }),
                            ],
                            marks: [
                                radialArea(data, {
                                    id: "athlete-profile",
                                    angle: "skill",
                                    radius: "score",
                                    key: "skill",
                                    curve: curveLinearClosed,
                                    fill: "var(--chart-1)",
                                    fillOpacity: 0.45,
                                    stroke: "var(--chart-1)",
                                    strokeWidth: 2,
                                }),
                            ],
                        }),
                    ],
                    margin: 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, angleScale, radiusScale],
    );

    return (
        <Card className="w-full max-w-xl">
            <CardHeader>
                <CardTitle>Multivariate Polar Radar Spider Chart</CardTitle>
                <CardDescription>Closed radial polygon plot evaluating multi-axis performance ratings</CardDescription>
            </CardHeader>
            <CardContent>
                <div className="flex h-[280px] w-full items-center justify-center">
                    <Chart
                        definition={definition}
                        renderer={motionRenderer}
                        height={280}
                        ariaLabel="Multivariate Polar Radar Spider Chart"
                    />
                </div>
            </CardContent>
            <CardFooter className="flex-col items-start gap-2 text-sm">
                <div className="flex items-center gap-2 leading-none font-medium">
                    Precision and Endurance score highest at 95% and 92%{" "}
                    <Compass className="h-4 w-4 text-emerald-500" />
                </div>
                <div className="text-muted-foreground leading-none">
                    Polygon radial grid guides partition equal angular spans for each attribute dimension
                </div>
            </CardFooter>
        </Card>
    );
}

export default RadarChart;