Gauge 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 { Gauge } from "lucide-react";

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

interface GaugeSegment {
    id: "value" | "remainder";
    label: string;
    value: number;
}

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

const startAngle = (-Math.PI * 3) / 4;
const endAngle = (Math.PI * 3) / 4;

function generateDemoData(): GaugeSegment[] {
    const value = 78;
    return [
        { id: "value", label: "System Health Score", value },
        { id: "remainder", label: "Remaining Gap", value: 100 - value },
    ];
}

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

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

    const arcs = useMemo(() => {
        return pie(data, {
            value: "value",
            startAngle,
            endAngle,
        });
    }, [data]);

    const definition = useMemo(
        () =>
            defineChart(
                {
                    renderer: motionRenderer,
                    scales: {
                        x: null,
                        y: null,
                    },
                    marks: [
                        polar({
                            inset: 0,
                            radiusRatio: 0.8,
                            scales: {
                                angle: null,
                                radius: null,
                            },
                            marks: [
                                radialArc(arcs, {
                                    id: "gauge-segments",
                                    key: "id",
                                    innerRadius: ({ radius }: { radius: number }) => radius * 0.72,
                                    color: "id",
                                    stroke: "var(--background)",
                                    strokeWidth: 2,
                                }),
                            ],
                        }),
                    ],
                    color: {
                        domain: ["value", "remainder"],
                        range: ["var(--chart-1)", "var(--muted)"],
                    },
                    margin: 10,
                    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),
                    },
                },
            ),
        [arcs],
    );

    return (
        <Card className="w-full max-w-xl">
            <CardHeader>
                <CardTitle>Radial Gauge Metric Dial</CardTitle>
                <CardDescription>
                    Arc meter dial indicating percentage completion relative to maximum target
                </CardDescription>
            </CardHeader>
            <CardContent>
                <div className="flex h-[250px] w-full items-center justify-center">
                    <Chart
                        definition={definition}
                        renderer={motionRenderer}
                        height={250}
                        ariaLabel="Radial Gauge Metric Dial Chart"
                    />
                </div>
            </CardContent>
            <CardFooter className="flex-col items-start gap-2 text-sm">
                <div className="flex items-center gap-2 leading-none font-medium">
                    System health operating at 78% optimal target <Gauge className="h-4 w-4 text-emerald-500" />
                </div>
                <div className="text-muted-foreground leading-none">
                    Sweeping 270-degree radial arc provides clean speedometer gauge visualization
                </div>
            </CardFooter>
        </Card>
    );
}

export default GaugeChart;