Temperature Range Band

import { type ChartPoint, areaY, defineChart, lineY } 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, scaleUtc } from "d3-scale";
import { Thermometer } from "lucide-react";

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

interface TempDatum {
    date: Date;
    low: number;
    high: number;
}

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

function generateDemoData(): TempDatum[] {
    const baseDate = new Date(2025, 5, 1);
    return Array.from({ length: 14 }, (_, i) => {
        const d = new Date(baseDate);
        d.setDate(baseDate.getDate() + i);
        const low = 52 + Math.sin(i * 0.4) * 6 + (i % 3);
        const high = low + 14 + Math.cos(i * 0.3) * 4;
        return { date: d, low, high };
    });
}

function shadcnTooltipContent<TDatum>(points: readonly ChartPoint<TDatum>[]) {
    if (points.length === 0) return { title: "", rows: [] };
    const d = points[0].datum as TempDatum;
    if (!d) return { title: "", rows: [] };
    const dateStr = d.date.toLocaleDateString("en-US", { month: "short", day: "numeric" });
    return {
        title: dateStr,
        rows: [
            { label: "High", value: `${d.high.toFixed(1)}°F`, color: "var(--chart-1)" },
            { label: "Low", value: `${d.low.toFixed(1)}°F`, color: "var(--chart-2)" },
        ],
    };
}

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

    const definition = useMemo(
        () =>
            defineChart(
                {
                    renderer: motionRenderer,
                    marks: [
                        areaY(data, {
                            id: "temp-band",
                            x: "date",
                            y1: "low",
                            y2: "high",
                            fill: "var(--chart-1)",
                            fillOpacity: 0.2,
                        }),
                        lineY(data, {
                            id: "temp-low",
                            x: "date",
                            y: "low",
                            stroke: "var(--chart-2)",
                            strokeWidth: 2,
                        }),
                        lineY(data, {
                            id: "temp-high",
                            x: "date",
                            y: "high",
                            stroke: "var(--chart-1)",
                            strokeWidth: 2,
                        }),
                    ],
                    scales: {
                        x: {
                            scale: scaleUtc,
                            axis: {
                                line: false,
                                label: "Date",
                                ticks: {
                                    size: 0,
                                    padding: 10,
                                    format: (d: Date) =>
                                        d.toLocaleDateString("en-US", { month: "short", day: "numeric" }),
                                },
                            },
                        },
                        y: {
                            scale: scaleLinear().domain([45, 80]),
                            grid: true,
                            axis: {
                                line: false,
                                label: "Temperature (°F)",
                                ticks: { size: 0 },
                            },
                        },
                    },
                    margin: { top: 24, right: 24, bottom: 32, left: 40 },
                    theme: {
                        foreground: "var(--muted-foreground)",
                        grid: "var(--border)",
                        background: "transparent",
                    },
                },
                {
                    focus: "group-x",
                    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>Daily Temperature Range</CardTitle>
                <CardDescription>Daily high and low ambient temperature band tracking</CardDescription>
            </CardHeader>
            <CardContent>
                <div className="h-[250px] w-full">
                    <Chart
                        definition={definition}
                        renderer={motionRenderer}
                        height={250}
                        ariaLabel="Daily Temperature Range Chart"
                    />
                </div>
            </CardContent>
            <CardFooter className="flex-col items-start gap-2 text-sm">
                <div className="flex items-center gap-2 leading-none font-medium">
                    Average variance remains within 15°F range <Thermometer className="h-4 w-4 text-sky-500" />
                </div>
                <div className="text-muted-foreground leading-none">
                    Shaded area represents temperature dispersion between min and max bounds
                </div>
            </CardFooter>
        </Card>
    );
}

export default TemperatureRangeBand;