Interval Timeline

import { type ChartPoint, barX, 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 } from "react";

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

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

interface RangeDatum {
    task: string;
    start: number;
    end: number;
    status: string;
}

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

function generateDemoData(): RangeDatum[] {
    return [
        { task: "Design System", start: 10, end: 35, status: "Complete" },
        { task: "API Gateway", start: 25, end: 60, status: "Complete" },
        { task: "Auth Service", start: 40, end: 80, status: "In Progress" },
        { task: "Dashboard UI", start: 55, end: 95, status: "In Progress" },
        { task: "Deploy Pipeline", start: 75, end: 120, status: "Pending" },
    ];
}

function shadcnTooltipContent<TDatum>(points: readonly ChartPoint<TDatum>[]) {
    if (points.length === 0) return { title: "", rows: [] };
    const d = points[0].datum as RangeDatum;
    if (!d) return { title: "", rows: [] };
    return {
        title: d.task,
        rows: [
            { label: "Status", value: d.status, color: points[0].color || "var(--chart-1)" },
            { label: "Duration", value: `${d.start} - ${d.end} days`, color: "var(--foreground)" },
        ],
    };
}

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

    const definition = useMemo(
        () =>
            defineChart(
                {
                    renderer: motionRenderer,
                    marks: [
                        barX(data, {
                            id: "interval-bars",
                            x1: "start",
                            x2: "end",
                            y: "task",
                            color: "status",
                            inset: 2,
                            radius: 4,
                        }),
                    ],
                    scales: {
                        x: {
                            scale: scaleLinear().domain([0, 140]),
                            grid: true,
                            axis: {
                                line: false,
                                label: "Timeline (Days)",
                                ticks: { size: 0 },
                            },
                        },
                        y: {
                            scale: () => scaleBand<string>().paddingInner(0.25),
                            axis: {
                                line: false,
                                ticks: { size: 0 },
                            },
                        },
                    },
                    color: {
                        domain: ["Complete", "In Progress", "Pending"],
                        range: ["var(--chart-1)", "var(--chart-2)", "var(--chart-3)"],
                    },
                    margin: { top: 24, right: 24, bottom: 32, left: 100 },
                    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>Project Phase Schedule</CardTitle>
                <CardDescription>Horizontal interval timeline tracking initiative milestone ranges</CardDescription>
            </CardHeader>
            <CardContent>
                <div className="h-[250px] w-full">
                    <Chart
                        definition={definition}
                        renderer={motionRenderer}
                        height={250}
                        ariaLabel="Project Phase Schedule Chart"
                    />
                </div>
            </CardContent>
            <CardFooter className="flex-col items-start gap-2 text-sm">
                <div className="flex items-center gap-2 leading-none font-medium">
                    4 out of 5 core tasks progressing on schedule <Activity className="h-4 w-4 text-emerald-500" />
                </div>
                <div className="text-muted-foreground leading-none">
                    Bar start and end positions delineate task interval start and target completion dates
                </div>
            </CardFooter>
        </Card>
    );
}

export default IntervalTimeline;