Log Scale Scatter

import { type ChartPoint, defineChart, dot } 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 { scaleLinear, scaleLog } from "d3-scale";
import { Scaling } from "lucide-react";

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

interface LogDatum {
    name: string;
    size: number;
    depth: number;
}

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

function generateDemoData(): LogDatum[] {
    const results: LogDatum[] = [];
    const packages = ["analytics", "animate", "data", "display", "flex", "physics", "query", "util"];

    for (let i = 0; i < 90; i++) {
        const pkg = packages[i % packages.length];
        const depth = 1 + Math.floor(Math.random() * 5);
        const size = Math.floor(200 * Math.pow(10, Math.random() * 2.5));
        results.push({
            name: `flare.${pkg}.Class${i + 1}`,
            size,
            depth,
        });
    }
    return results;
}

function shadcnTooltipContent<TDatum>(points: readonly ChartPoint<TDatum>[]) {
    if (points.length === 0) return { title: "", rows: [] };
    const d = points[0].datum as LogDatum;
    if (!d) return { title: "", rows: [] };
    return {
        title: d.name,
        rows: [
            { label: "Class Size (Bytes)", value: `${d.size.toLocaleString()}`, color: "var(--chart-1)" },
            { label: "Hierarchy Depth", value: `${d.depth}`, color: "var(--foreground)" },
        ],
    };
}

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

    const definition = useMemo(
        () =>
            defineChart(
                {
                    renderer: motionRenderer,
                    marks: [
                        dot(data, {
                            id: "class-size-points",
                            x: "size",
                            y: "depth",
                            key: "name",
                            r: 4,
                            fill: "var(--chart-1)",
                            stroke: "var(--background)",
                            strokeWidth: 1,
                        }),
                    ],
                    margin: { top: 24, right: 24, bottom: 32, left: 45 },
                    scales: {
                        x: {
                            scale: scaleLog().domain([100, 100_000]),
                            grid: true,
                            axis: {
                                label: "Class Size (Log Bytes)",
                                ticks: {
                                    format: (v: number) => (v >= 1000 ? `${v / 1000}k` : `${v}`),
                                },
                            },
                        },
                        y: {
                            scale: scaleLinear().domain([0, 6]),
                            grid: true,
                            axis: { label: "Package Hierarchy Depth" },
                        },
                    },
                    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>Logarithmic Axis Class Size Scatterplot</CardTitle>
                <CardDescription>
                    Log-scale X axis scatter showing multi-order-of-magnitude codebase distributions
                </CardDescription>
            </CardHeader>
            <CardContent>
                <div className="h-[250px] w-full">
                    <Chart
                        definition={definition}
                        renderer={motionRenderer}
                        height={250}
                        ariaLabel="Logarithmic Axis Class Size Scatterplot Chart"
                    />
                </div>
            </CardContent>
            <CardFooter className="flex-col items-start gap-2 text-sm">
                <div className="flex items-center gap-2 leading-none font-medium">
                    Log scale expands wide 100 to 100,000 Byte dynamic range{" "}
                    <Scaling className="h-4 w-4 text-emerald-500" />
                </div>
                <div className="text-muted-foreground leading-none">
                    Logarithmic spacing prevents compression of smaller values on linear scales
                </div>
            </CardFooter>
        </Card>
    );
}

export default LogScaleScatter;