Active Bar Visitor Dashboard

import { barY, crosshair, defineChart } from "@tanstack/charts";
import { motion } from "@tanstack/charts/motion";
import { tooltip } from "@tanstack/charts/tooltip";
import { Chart } from "@tanstack/react-charts/core";
import { useMemo, useState } from "react";

import { scaleBand, scaleLinear } from "d3-scale";

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

interface DashboardRow {
    id: string;
    day: string;
    desktop: number;
    mobile: number;
}

type MetricType = "desktop" | "mobile";

const chartConfig = {
    desktop: {
        label: "Desktop",
        color: "var(--chart-1)",
    },
    mobile: {
        label: "Mobile",
        color: "var(--chart-2)",
    },
} satisfies ChartConfig;

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

function generateDemoData(): DashboardRow[] {
    const results: DashboardRow[] = [];
    for (let i = 1; i <= 30; i++) {
        const id = i < 10 ? `0${i}` : `${i}`;
        results.push({
            id,
            day: `Jun ${i}`,
            desktop: Math.floor(120 + Math.sin(i * 0.4) * 80 + Math.random() * 40),
            mobile: Math.floor(90 + Math.cos(i * 0.3) * 60 + Math.random() * 30),
        });
    }
    return results;
}

export function ActiveBarDashboard() {
    const [activeTab, setActiveTab] = useState<MetricType>("desktop");
    const data = useMemo(() => generateDemoData(), []);

    const totals = useMemo(() => {
        const totalDesktop = data.reduce((acc, curr) => acc + curr.desktop, 0);
        const totalMobile = data.reduce((acc, curr) => acc + curr.mobile, 0);
        return {
            desktop: totalDesktop,
            mobile: totalMobile,
        };
    }, [data]);

    const yMax = useMemo(() => {
        const max = Math.max(...data.map((d) => d[activeTab]));
        return Math.ceil((max * 1.15) / 50) * 50;
    }, [data, activeTab]);

    const tickIds = ["01", "07", "14", "21", "28"];

    const definition = useMemo(
        () =>
            defineChart(
                {
                    renderer: motionRenderer,
                    motion: {
                        transition: { type: "spring", stiffness: 170, damping: 18, mass: 1 },
                    },
                    marks: [
                        barY(data, {
                            id: "daily-visitors",
                            x: "id",
                            y: activeTab,
                            key: "id",
                            fill: "url(#visitor-bars-gradient)",
                            radius: 4,
                        }),
                        crosshair<string, number>({
                            id: "active-bar-ring",
                            x: {
                                band: {
                                    fill: "transparent",
                                    stroke: chartConfig[activeTab].color,
                                    strokeOpacity: 0.9,
                                    strokeWidth: 1.5,
                                    radius: 5,
                                },
                            },
                            y: false,
                        }),
                    ],
                    scales: {
                        x: {
                            scale: scaleBand<string>()
                                .domain(data.map((d) => d.id))
                                .paddingInner(0.2),
                            axis: {
                                line: false,
                                ticks: {
                                    values: tickIds,
                                    format: (v: string) => data.find((d) => d.id === v)?.day ?? "",
                                },
                            },
                        },
                        y: {
                            scale: scaleLinear().domain([0, yMax]).nice(),
                            grid: true,
                            axis: false,
                        },
                    },
                    gradients: [
                        {
                            id: "visitor-bars-gradient",
                            x1: 0,
                            y1: 1,
                            x2: 0,
                            y2: 0,
                            stops: [
                                { offset: 0, color: chartConfig[activeTab].color, opacity: 0.35 },
                                { offset: 1, color: chartConfig[activeTab].color, opacity: 0.95 },
                            ],
                        },
                    ],
                    margin: { top: 20, right: 12, bottom: 32, left: 12 },
                    theme: {
                        foreground: "var(--muted-foreground)",
                        grid: "var(--border)",
                        background: "transparent",
                    },
                },
                {
                    keyboard: true,
                    focus: "group-x",
                    tooltip: {
                        use: tooltip,
                        motion: { type: "spring", stiffness: 170, damping: 18 },
                        className: "font-sans! shadow-none! capitalize!",
                        content: (points) => {
                            const datum = points[0]?.datum as DashboardRow;
                            if (!datum) return { rows: [] };
                            return {
                                title: datum.day,
                                rows: [
                                    {
                                        label: chartConfig[activeTab].label,
                                        value: `${datum[activeTab].toLocaleString("en-US")} visitors`,
                                        color: chartConfig[activeTab].color,
                                    },
                                ],
                            };
                        },
                    },
                },
            ),
        [data, activeTab, yMax],
    );

    return (
        <Card className="gap-0 py-4 sm:py-0">
            <CardHeader className="flex flex-col items-stretch border-b p-0! sm:flex-row">
                {/* Title Context */}
                <div className="flex flex-1 flex-col justify-center gap-1 px-6 pt-4 pb-3 sm:pt-6 sm:pb-6">
                    <CardTitle className="text-lg">Active Bar Visitor Dashboard</CardTitle>
                    <CardDescription>
                        Interactive daily visitor traffic with focus ring cursor (Last 30 Days)
                    </CardDescription>
                </div>

                {/* Tab Controls */}
                <div className="flex">
                    {(["desktop", "mobile"] as const).map((key) => {
                        return (
                            <button
                                key={key}
                                data-active={activeTab === key}
                                className="data-[active=true]:bg-muted/50 hover:bg-muted/30 flex flex-1 flex-col justify-center gap-1 border-t px-6 py-4 text-left transition-colors even:border-l sm:border-t-0 sm:border-l sm:px-8 sm:py-6"
                                onClick={() => setActiveTab(key)}>
                                <span className="text-muted-foreground text-xs tracking-wider uppercase">
                                    {chartConfig[key].label}
                                </span>
                                <span className="text-lg leading-none font-bold sm:text-2xl">
                                    {totals[key].toLocaleString("en-US")}
                                </span>
                            </button>
                        );
                    })}
                </div>
            </CardHeader>

            <CardContent className="px-2 pt-4 sm:p-6 sm:pt-8">
                {/* Dynamic Legend Indicator */}
                <div className="text-muted-foreground mb-4 flex items-center justify-end gap-2 text-xs font-medium">
                    <span
                        className="h-2.5 w-2.5 rounded-full transition-colors duration-300"
                        style={{ backgroundColor: chartConfig[activeTab].color }}
                    />
                    <span>{chartConfig[activeTab].label} Visitors</span>
                </div>

                <div className="h-[280px] w-full">
                    <Chart
                        definition={definition}
                        renderer={motionRenderer}
                        height={280}
                        ariaLabel={`Active bar visitor dashboard chart displaying ${activeTab} data`}
                    />
                </div>
            </CardContent>
        </Card>
    );
}

export default ActiveBarDashboard;