Treemap Chart

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

import { Layout } from "lucide-react";

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

interface FlareNode {
    name: string;
    size: number;
}

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

function generateDemoData(): FlareNode[] {
    return [
        { name: "flare.analytics.cluster.AgglomerativeCluster", size: 3938 },
        { name: "flare.analytics.cluster.CommunityStructure", size: 3812 },
        { name: "flare.analytics.cluster.HierarchicalCluster", size: 6714 },
        { name: "flare.analytics.graph.BetweennessCentrality", size: 3534 },
        { name: "flare.analytics.graph.LinkDistance", size: 5731 },
        { name: "flare.animate.Easing", size: 17010 },
        { name: "flare.animate.FunctionSequence", size: 5842 },
        { name: "flare.animate.Tween", size: 6006 },
        { name: "flare.data.DataField", size: 1759 },
        { name: "flare.data.DataSchema", size: 2165 },
        { name: "flare.display.LineSprite", size: 1732 },
        { name: "flare.display.RectSprite", size: 3623 },
        { name: "flare.physics.DragForce", size: 1082 },
        { name: "flare.physics.GravityForce", size: 1336 },
        { name: "flare.physics.SpringForce", size: 1681 },
        { name: "flare.query.AggregateExpression", size: 1616 },
        { name: "flare.util.MathUtil", size: 8223 },
        { name: "flare.util.StringUtil", size: 11234 },
    ];
}

function shadcnTooltipContent<TDatum>(points: readonly ChartPoint<TDatum>[]) {
    if (points.length === 0) return { title: "", rows: [] };
    const d = points[0].datum as { path?: string; value?: number; name?: string };
    if (!d) return { title: "", rows: [] };
    const nodeName = d.name || d.path || "Class Node";
    return {
        title: nodeName.split(".").pop() || nodeName,
        rows: [
            { label: "File Size", value: `${(d.value || 0).toLocaleString()} Bytes`, color: "var(--chart-1)" },
            { label: "Package", value: nodeName.split(".").slice(0, -1).join("."), color: "var(--foreground)" },
        ],
    };
}

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

    const definition = useMemo(
        () =>
            defineChart(
                {
                    renderer: motionRenderer,
                    marks: [
                        treemap(data, {
                            id: "treemap-cells",
                            path: "name",
                            delimiter: ".",
                            value: "size",
                            ratio: 4 / 3,
                            round: true,
                            color: (node) => node.ancestorIds.at(-1) ?? node.id,
                            inset: 1,
                            stroke: "var(--background)",
                            strokeWidth: 1.5,
                            label: (node) => node.id.split(".").pop() ?? "",
                            labelFill: "var(--primary-foreground)",
                            labelFontSize: 9,
                            labelFontWeight: 600,
                        }),
                    ],
                    color: {
                        range: [
                            "var(--chart-1)",
                            "var(--chart-2)",
                            "var(--chart-3)",
                            "var(--chart-4)",
                            "var(--chart-5)",
                        ],
                    },
                    scales: {
                        x: null,
                        y: null,
                    },
                    guides: false,
                    margin: 4,
                    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>Squarified Hierarchical Treemap</CardTitle>
                <CardDescription>
                    Space-filling treemap tiling nested package structure proportional to file sizes
                </CardDescription>
            </CardHeader>
            <CardContent>
                <div className="h-[250px] w-full">
                    <Chart
                        definition={definition}
                        renderer={motionRenderer}
                        height={250}
                        ariaLabel="Squarified Hierarchical Treemap Chart"
                    />
                </div>
            </CardContent>
            <CardFooter className="flex-col items-start gap-2 text-sm">
                <div className="flex items-center gap-2 leading-none font-medium">
                    Animate and Util packages occupy largest rectangular area{" "}
                    <Layout className="h-4 w-4 text-emerald-500" />
                </div>
                <div className="text-muted-foreground leading-none">
                    Squarified layout optimizes aspect ratios for easy visual area comparison
                </div>
            </CardFooter>
        </Card>
    );
}

export default Treemap;