Pomodoro

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import { type ClassValue, clsx } from "clsx";
import { twMerge } from "tailwind-merge";
 
export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs));
}

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"use client";
 
import {
  forwardRef,
  useEffect,
  useState,
  type ComponentPropsWithoutRef,
} from "react";
 
import { cn } from "@/lib/cn";
import { Pause, Play } from "lucide-react";
 
const DIAL = { cx: 88, cy: 88, r: 56 } as const;
const CIRC = 2 * Math.PI * DIAL.r;
const TOMATO = "#E85D4C";
 
function formatTime(totalSeconds: number) {
  const mins = Math.floor(totalSeconds / 60);
  const secs = totalSeconds % 60;
  return {
    mins: String(mins).padStart(2, "0"),
    secs: String(secs).padStart(2, "0"),
  };
}
 
export type PomodoroWidgetProps = Readonly<
  {
    minutes?: number;
    label?: string;
  } & ComponentPropsWithoutRef<"button">
>;
 
// Pomodoro — dark timer card with a thin ring, tap to start or pause.
export const PomodoroWidget = forwardRef<HTMLButtonElement, PomodoroWidgetProps>(
  (
    {
      className,
      minutes = 25,
      label = "Focus",
      onClick,
      ...props
    },
    ref,
  ) => {
    const totalSeconds = minutes * 60;
    const [remaining, setRemaining] = useState(totalSeconds);
    const [running, setRunning] = useState(false);
 
    useEffect(() => {
      if (!running || remaining <= 0) return;
      const timer = globalThis.setInterval(() => {
        setRemaining((prev) => {
          if (prev <= 1) {
            setRunning(false);
            return 0;
          }
          return prev - 1;
        });
      }, 1000);
      return () => globalThis.clearInterval(timer);
    }, [running, remaining]);
 
    const progress = remaining / totalSeconds;
    const dashOffset = CIRC * (1 - progress);
    const { mins, secs } = formatTime(remaining);
    const isDone = remaining <= 0;
 
    const handleToggle = () => {
      if (isDone) {
        setRemaining(totalSeconds);
        setRunning(true);
        return;
      }
      setRunning((prev) => !prev);
    };
 
    return (
      <button
        ref={ref}
        type="button"
        aria-pressed={running}
        aria-label={running ? "Pause timer" : isDone ? "Restart timer" : "Start timer"}
        data-slot="pomodoro-widget"
        onClick={(event) => {
          handleToggle();
          onClick?.(event);
        }}
        className={cn(
          "relative h-44 w-44 max-w-full cursor-pointer overflow-hidden rounded-[1.75rem] bg-[#0C0C0C] font-sans shadow-lg shadow-black/5 select-none transition-transform active:scale-[0.98]",
          className,
        )}
        {...props}
      >
        <svg
          viewBox="0 0 176 176"
          className="absolute inset-0 size-full"
          aria-hidden
        >
          <rect width="176" height="176" fill="#0C0C0C" />
          <circle
            cx={DIAL.cx}
            cy={DIAL.cy}
            r={DIAL.r}
            fill="none"
            stroke="rgba(255,255,255,0.07)"
            strokeWidth="1.5"
          />
          <circle
            cx={DIAL.cx}
            cy={DIAL.cy}
            r={DIAL.r}
            fill="none"
            stroke={running ? TOMATO : "rgba(255,255,255,0.32)"}
            strokeWidth="1.5"
            strokeLinecap="round"
            strokeDasharray={CIRC}
            strokeDashoffset={dashOffset}
            transform={`rotate(-90 ${DIAL.cx} ${DIAL.cy})`}
            className="transition-[stroke,stroke-dashoffset] duration-1000 ease-linear"
          />
        </svg>
 
        <div className="absolute inset-0 flex flex-col items-center justify-center">
          <p className="flex items-baseline font-mono text-[1.75rem] leading-none font-light tracking-[-0.03em] tabular-nums">
            <span className="text-white">{mins}</span>
            <span className="mx-px text-white/30">:</span>
            <span className={cn(running ? "text-white/90" : "text-white/55")}>
              {secs}
            </span>
          </p>
          <p
            className={cn(
              "mt-2 text-[10px] font-medium tracking-[0.14em] uppercase",
              running ? "text-[#E85D4C]/80" : "text-white/30",
            )}
          >
            {isDone ? "Done" : running ? "Running" : label}
          </p>
        </div>
 
        <span
          className="absolute right-3.5 bottom-3.5 z-10 flex size-7 items-center justify-center rounded-full bg-white/[0.07] text-white/70"
          aria-hidden
        >
          {running ? (
            <Pause size={11} strokeWidth={2.5} fill="currentColor"/>
          ) : (
            <Play size={11} strokeWidth={2.5} className="ml-0.5" fill="currentColor" />
          )}
        </span>
      </button>
    );
  },
);
 
PomodoroWidget.displayName = "PomodoroWidget";