Pinned Nested Chart Tooltip

import { type ChartPoint, areaY, barY, d3Curve, 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 { curveMonotoneX } from "d3-shape";
import { Zap } from "lucide-react";

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

interface MonthlyEnergy {
    month: string;
    consumption: number;
    usedOnSite: number;
    generation: number;
}

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

const monthNames = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];

function generateDemoData(): MonthlyEnergy[] {
    return monthNames.map((m, idx) => {
        const generation = Math.round(800 + Math.sin((idx / 12) * Math.PI * 2) * 500);
        const usedOnSite = Math.round(generation * (0.6 + Math.random() * 0.2));
        const consumption = Math.round(1200 + Math.cos((idx / 12) * Math.PI * 2) * 300);
        return {
            month: m,
            consumption,
            usedOnSite,
            generation,
        };
    });
}

function shadcnTooltipContent<TDatum>(points: readonly ChartPoint<TDatum>[]) {
    if (points.length === 0) return { title: "", rows: [] };
    const d = points[0].datum as MonthlyEnergy;
    if (!d) return { title: "", rows: [] };
    return {
        title: `${d.month} Energy Summary`,
        rows: [
            { label: "Total Consumption", value: `${d.consumption.toLocaleString()} kWh`, color: "var(--chart-1)" },
            { label: "Used On-Site (Solar)", value: `${d.usedOnSite.toLocaleString()} kWh`, color: "var(--chart-2)" },
            { label: "Total Generation", value: `${d.generation.toLocaleString()} kWh`, color: "var(--chart-3)" },
        ],
    };
}

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

    const definition = useMemo(
        () =>
            defineChart(
                {
                    renderer: motionRenderer,
                    marks: [
                        areaY(data, {
                            id: "consumption-area",
                            x: "month",
                            y: "consumption",
                            fill: "var(--chart-1)",
                            fillOpacity: 0.15,
                            curve: d3Curve(curveMonotoneX),
                        }),
                        barY(data, {
                            id: "used-on-site",
                            x: "month",
                            y: "usedOnSite",
                            fill: "var(--chart-2)",
                            inset: 0.5,
                            radius: 3,
                        }),
                        lineY(data, {
                            id: "consumption-line",
                            x: "month",
                            y: "consumption",
                            stroke: "var(--chart-1)",
                            strokeWidth: 2,
                            curve: d3Curve(curveMonotoneX),
                        }),
                        dot(data, {
                            id: "consumption-points",
                            x: "month",
                            y: "consumption",
                            fill: "var(--background)",
                            stroke: "var(--chart-1)",
                            strokeWidth: 2,
                            r: 3.5,
                        }),
                    ],
                    scales: {
                        x: {
                            scale: () => scaleBand<string>().domain(monthNames).paddingInner(0.2),
                        },
                        y: {
                            scale: scaleLinear().domain([0, 2400]),
                            grid: true,
                            axis: { label: "Energy (kWh)" },
                        },
                    },
                    margin: { top: 24, right: 24, bottom: 32, left: 45 },
                    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>Pinned Energy Generation Breakdown Tooltip</CardTitle>
                <CardDescription>
                    Rich interactive popover tooltip rendering nested breakdown metrics on hover
                </CardDescription>
            </CardHeader>
            <CardContent>
                <div className="h-[250px] w-full">
                    <Chart
                        definition={definition}
                        renderer={motionRenderer}
                        height={250}
                        ariaLabel="Pinned Energy Generation Breakdown Tooltip Chart"
                    />
                </div>
            </CardContent>
            <CardFooter className="flex-col items-start gap-2 text-sm">
                <div className="flex items-center gap-2 leading-none font-medium">
                    Solar generation peaks during summer month curves <Zap className="h-4 w-4 text-emerald-500" />
                </div>
                <div className="text-muted-foreground leading-none">
                    Combines Area (total demand), Bar (solar on-site), and Line (grid load)
                </div>
            </CardFooter>
        </Card>
    );
}

export default PinnedNestedChartTooltip;