Waffle Unit Chart

import { type ChartPoint, defineChart, waffleY } 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 { Grid3X3 } from "lucide-react";

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

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

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

function generateDemoData(): WaffleDatum[] {
    return [
        { category: "React", value: 35 },
        { category: "Vue", value: 25 },
        { category: "Svelte", value: 20 },
        { category: "Angular", value: 12 },
        { category: "Solid", value: 8 },
    ];
}

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

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

    const definition = useMemo(
        () =>
            defineChart(
                {
                    renderer: motionRenderer,
                    scales: {
                        x: null,
                        y: null,
                    },
                    marks: [
                        waffleY(data, {
                            y: "value",
                            color: "category",
                            key: "category",
                            unit: 1,
                            gap: 2,
                            round: true,
                            radius: 3,
                        }),
                    ],
                    guides: false,
                    color: {
                        domain: data.map((d) => d.category),
                        range: [
                            "var(--chart-1)",
                            "var(--chart-2)",
                            "var(--chart-3)",
                            "var(--chart-4)",
                            "var(--chart-5)",
                        ],
                    },
                    margin: { top: 24, right: 24, bottom: 24, left: 24 },
                    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>Frontend Framework Market Share Waffle</CardTitle>
                <CardDescription>100-cell unit square grid representing proportion breakdown</CardDescription>
            </CardHeader>
            <CardContent>
                <div className="h-[250px] w-full">
                    <Chart
                        definition={definition}
                        renderer={motionRenderer}
                        height={250}
                        ariaLabel="Frontend Framework Market Share Waffle Chart"
                    />
                </div>
            </CardContent>
            <CardFooter className="flex-col items-start gap-2 text-sm">
                <div className="flex items-center gap-2 leading-none font-medium">
                    React and Vue account for 60% of overall developer usage{" "}
                    <Grid3X3 className="h-4 w-4 text-emerald-500" />
                </div>
                <div className="text-muted-foreground leading-none">
                    Each rounded grid unit square represents 1% market allocation
                </div>
            </CardFooter>
        </Card>
    );
}

export default WaffleUnitChart;