Diverging Likert

import { type ChartPoint, barX, defineChart, ruleX, stack } 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 { MessageSquare } from "lucide-react";

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

interface LikertDatum {
    Question: string;
    Response: string;
    count: number;
}

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

const responseCategories = ["Disagree", "Neutral", "Agree"];

function generateDemoData(): LikertDatum[] {
    const questions = ["Usability", "Performance", "Documentation", "Support"];
    const results: LikertDatum[] = [];

    questions.forEach((q, idx) => {
        results.push({ Question: q, Response: "Disagree", count: 15 + idx * 5 });
        results.push({ Question: q, Response: "Neutral", count: 25 + idx * 3 });
        results.push({ Question: q, Response: "Agree", count: 60 - idx * 8 });
    });
    return results;
}

function shadcnTooltipContent<TDatum>(points: readonly ChartPoint<TDatum>[]) {
    if (points.length === 0) return { title: "", rows: [] };
    const d = points[0].datum as LikertDatum;
    if (!d) return { title: "", rows: [] };
    return {
        title: d.Question,
        rows: [
            {
                label: d.Response,
                value: `${d.count} responses`,
                color: points[0].color || "var(--chart-1)",
            },
        ],
    };
}

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

    const definition = useMemo(
        () =>
            defineChart(
                {
                    renderer: motionRenderer,
                    marks: [
                        barX(data, {
                            id: "likert-bars",
                            x: "count",
                            y: "Question",
                            z: "Response",
                            color: "Response",
                            layout: stack({
                                order: responseCategories,
                                anchor: { series: "Neutral", fraction: 0.5 },
                            }),
                            inset: 1,
                            radius: 3,
                        }),
                        ruleX([0], { stroke: "var(--border)" }),
                    ],
                    scales: {
                        x: {
                            scale: scaleLinear,
                            grid: true,
                            axis: {
                                line: false,
                                label: "← Disagree · Neutral · Agree →",
                                ticks: {
                                    size: 0,
                                    format: (v: number) => `${Math.abs(v)}`,
                                },
                            },
                        },
                        y: {
                            scale: () => scaleBand<string>().paddingInner(0.2),
                            axis: {
                                line: false,
                                ticks: { size: 0 },
                            },
                        },
                    },
                    color: {
                        domain: responseCategories,
                        range: ["var(--chart-5)", "var(--chart-3)", "var(--chart-1)"],
                    },
                    margin: { top: 24, right: 24, bottom: 32, left: 90 },
                    theme: {
                        foreground: "var(--muted-foreground)",
                        grid: "var(--border)",
                        background: "transparent",
                    },
                },
                {
                    focus: "group-y",
                    tooltip: {
                        use: tooltip,
                        className:
                            "font-sans shadow-none rounded-md bg-popover text-popover-foreground border p-2 text-xs",
                        anchor: "group-center",
                        placement: "auto",
                        content: (points) => shadcnTooltipContent(points),
                    },
                },
            ),
        [data],
    );

    return (
        <Card className="w-full max-w-xl">
            <CardHeader>
                <CardTitle>User Satisfaction Survey</CardTitle>
                <CardDescription>Diverging Likert scale bars anchored around neutral survey sentiment</CardDescription>
            </CardHeader>
            <CardContent>
                <div className="h-[250px] w-full">
                    <Chart
                        definition={definition}
                        renderer={motionRenderer}
                        height={250}
                        ariaLabel="User Satisfaction Survey Chart"
                    />
                </div>
            </CardContent>
            <CardFooter className="flex-col items-start gap-2 text-sm">
                <div className="flex items-center gap-2 leading-none font-medium">
                    Usability receives highest positive agree ratio (60%){" "}
                    <MessageSquare className="h-4 w-4 text-blue-500" />
                </div>
                <div className="text-muted-foreground leading-none">
                    Positive sentiment extends to the right; negative sentiment diverges to the left
                </div>
            </CardFooter>
        </Card>
    );
}

export default DivergingLikert;