Parallel Coordinates

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

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

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

interface ParallelDatum {
    Country: string;
    event: string;
    relativePerformance: number;
}

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

const eventsList = ["100m", "LongJump", "ShotPut", "HighJump", "400m"];

function generateDemoData(): ParallelDatum[] {
    const countries = ["USA", "GER", "FRA", "GBR"];
    const results: ParallelDatum[] = [];

    countries.forEach((country, cIdx) => {
        eventsList.forEach((ev, eIdx) => {
            const score = 40 + Math.sin(cIdx * 1.5 + eIdx) * 35 + cIdx * 5;
            results.push({ Country: country, event: ev, relativePerformance: Math.min(100, Math.max(10, score)) });
        });
    });
    return results;
}

function shadcnTooltipContent<TDatum>(points: readonly ChartPoint<TDatum>[]) {
    if (points.length === 0) return { title: "", rows: [] };
    const d = points[0].datum as ParallelDatum;
    if (!d) return { title: "", rows: [] };
    return {
        title: `${d.Country} - ${d.event}`,
        rows: [
            {
                label: "Relative Score",
                value: `${d.relativePerformance.toFixed(1)}/100`,
                color: points[0].color || "var(--chart-1)",
            },
        ],
    };
}

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

    const definition = useMemo(
        () =>
            defineChart(
                {
                    renderer: motionRenderer,
                    marks: [
                        lineY(data, {
                            id: "country-lines",
                            x: "event",
                            y: "relativePerformance",
                            color: "Country",
                            key: (d: ParallelDatum) => `${d.Country}:${d.event}`,
                            strokeWidth: 2,
                        }),
                        dot(data, {
                            id: "country-points",
                            x: "event",
                            y: "relativePerformance",
                            color: "Country",
                            key: (d: ParallelDatum) => `${d.Country}:${d.event}`,
                            r: 3.5,
                        }),
                    ],
                    scales: {
                        x: {
                            scale: () => scaleBand<string>().domain(eventsList).padding(0.1),
                            axis: {
                                line: false,
                                label: "Decathlon Event",
                                ticks: { size: 0, padding: 10 },
                            },
                        },
                        y: {
                            scale: scaleLinear().domain([0, 100]),
                            grid: true,
                            axis: {
                                line: false,
                                label: "Relative Score (%)",
                                ticks: { size: 0 },
                            },
                        },
                    },
                    color: {
                        domain: ["USA", "GER", "FRA", "GBR"],
                        range: ["var(--chart-1)", "var(--chart-2)", "var(--chart-3)", "var(--chart-4)"],
                    },
                    margin: { top: 24, right: 24, bottom: 32, left: 45 },
                    theme: {
                        foreground: "var(--muted-foreground)",
                        grid: "var(--border)",
                        background: "transparent",
                    },
                },
                {
                    focus: "group-x",
                    tooltip: {
                        use: tooltip,
                        className:
                            "font-sans shadow-none rounded-md bg-popover text-popover-foreground border p-2 text-xs",
                        anchor: "group-center",
                        placement: "auto",
                        content: (points) => shadcnTooltipContent(points),
                    },
                },
            ),
        [data],
    );

    return (
        <Card className="w-full max-w-xl">
            <CardHeader>
                <CardTitle>Multivariate Performance Profile</CardTitle>
                <CardDescription>
                    Parallel coordinates comparing multi-attribute athlete scores across events
                </CardDescription>
            </CardHeader>
            <CardContent>
                <div className="h-[250px] w-full">
                    <Chart
                        definition={definition}
                        renderer={motionRenderer}
                        height={250}
                        ariaLabel="Multivariate Performance Profile Chart"
                    />
                </div>
            </CardContent>
            <CardFooter className="flex-col items-start gap-2 text-sm">
                <div className="flex items-center gap-2 leading-none font-medium">
                    USA leads overall performance profile across speed events{" "}
                    <GitCommit className="h-4 w-4 text-purple-500" />
                </div>
                <div className="text-muted-foreground leading-none">
                    Connected series lines display high-dimensional metric tradeoffs across vertical axes
                </div>
            </CardFooter>
        </Card>
    );
}

export default ParallelCoordinates;