Recorder Face

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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,
  useRef,
  useState,
  type ComponentPropsWithoutRef,
  type MouseEvent,
} from "react";
 
import { cn } from "@/lib/cn";
import { Pause, Play } from "lucide-react";
 
const ACCENT = "#FF453A";
const MASCOT = "#6CA8FF";
 
// Formats elapsed milliseconds as MM:SS for the dial readout
function formatTime(ms: number) {
  const s = Math.floor(ms / 1000);
  return `${String(Math.floor(s / 60)).padStart(2, "0")}:${String(s % 60).padStart(2, "0")}`;
}
 
type RecordMascotProps = Readonly<{
  recording: boolean;
}>;
 
// Blue mascot at the bottom — mouth opens into an O while recording
function RecordMascot({ recording }: RecordMascotProps) {
  return (
    <g aria-hidden>
      <circle cx="88" cy="142" r="58" fill={MASCOT} />
      <circle cx="68" cy="122" r="5" fill="white" />
      <circle cx="108" cy="122" r="5" fill="white" />
      <circle cx="69" cy="123" r="2.2" fill="#1C1C1E" />
      <circle cx="109" cy="123" r="2.2" fill="#1C1C1E" />
      {recording ? (
        <ellipse cx="88" cy="139" rx="5" ry="4" fill="white" />
      ) : (
        <path
          d="M76 138 Q88 146 100 138"
          stroke="white"
          strokeWidth="2.2"
          fill="none"
          strokeLinecap="round"
        />
      )}
    </g>
  );
}
 
export type RecorderFaceWidgetProps = Readonly<
  ComponentPropsWithoutRef<"button">
>;
 
// Recorder widget — black dial, mascot face, play/pause icon, live timer
export const RecorderFaceWidget = forwardRef<
  HTMLButtonElement,
  RecorderFaceWidgetProps
>(({ className, onClick, ...props }, ref) => {
  const [recording, setRecording] = useState(false);
  const [elapsed, setElapsed] = useState(0);
  // startRef = when the current run began; baseRef = ms already counted before pause
  const startRef = useRef(0);
  const baseRef = useRef(0);
 
  // requestAnimationFrame loop keeps the timer smooth while recording
  useEffect(() => {
    if (recording) {
      startRef.current = performance.now();
      let frame = 0;
      const tick = () => {
        setElapsed(baseRef.current + performance.now() - startRef.current);
        frame = globalThis.requestAnimationFrame(tick);
      };
      frame = globalThis.requestAnimationFrame(tick);
      return () => globalThis.cancelAnimationFrame(frame);
    }
  }, [recording]);
 
  const toggle = (e: MouseEvent<HTMLButtonElement>) => {
    if (recording) {
      baseRef.current += performance.now() - startRef.current;
      setElapsed(baseRef.current);
      setRecording(false);
    } else {
      baseRef.current = 0;
      setElapsed(0);
      setRecording(true);
    }
    onClick?.(e);
  };
 
  return (
    <button
      ref={ref}
      type="button"
      onClick={toggle}
      aria-pressed={recording}
      aria-label={recording ? "Pause recording" : "Start recording"}
      data-slot="minimal-record-button"
      className={cn(
        "relative h-44 w-44 max-w-full cursor-pointer overflow-hidden rounded-[1.75rem] bg-black font-sans shadow-lg shadow-black/5 select-none",
        className,
      )}
      {...props}
    >
      <svg
        viewBox="0 0 176 176"
        className="absolute inset-0 h-full w-full"
        aria-hidden
      >
        <rect width="176" height="176" fill="#000" />
        <RecordMascot recording={recording} />
        <circle
          cx="88"
          cy="84"
          r="56"
          fill="none"
          stroke="white"
          strokeWidth="1.5"
          opacity="0.35"
        />
      </svg>
 
      <span className="absolute top-3.5 right-3.5 z-10" aria-hidden>
        {recording ? (
          <Pause size={14} color={ACCENT} fill={ACCENT} />
        ) : (
          <Play size={14} color="white" fill="white" />
        )}
      </span>
 
      <p
        className={cn(
          "relative z-10 flex h-full items-center justify-center pb-10 text-[26px] leading-none font-extralight tracking-[-0.04em] tabular-nums",
          recording ? "text-white" : "text-white/40",
        )}
      >
        {formatTime(elapsed)}
      </p>
    </button>
  );
});
 
RecorderFaceWidget.displayName = "RecorderFaceWidget";