import { useEffect, useState } from 'react';
import styles from './AnalogClock.module.css';

// ── SVG-Konstanten ────────────────────────────────────────────────────────────

const CX = 50;
const CY = 50;
const R  = 43;

/** Berechnet die Spitzenkoordinaten eines Uhrzeigers. */
function handTip(
  cx: number,
  cy: number,
  deg: number,
  length: number,
): { x: number; y: number } {
  // 0° = 12 Uhr, im Uhrzeigersinn
  const rad = ((deg - 90) * Math.PI) / 180;
  return {
    x: cx + length * Math.cos(rad),
    y: cy + length * Math.sin(rad),
  };
}

// ── Komponente ────────────────────────────────────────────────────────────────

export function AnalogClock() {
  const [now, setNow] = useState(() => new Date());

  useEffect(() => {
    const id = setInterval(() => setNow(new Date()), 1000);
    return () => clearInterval(id);
  }, []);

  const h = now.getHours() % 12;
  const m = now.getMinutes();
  const s = now.getSeconds();

  const hourDeg   = h * 30 + m * 0.5;      // 360° / 12h
  const minuteDeg = m * 6  + s * 0.1;      // 360° / 60min
  const secondDeg = s * 6;                  // 360° / 60s

  const hTip    = handTip(CX, CY, hourDeg,   26);
  const mTip    = handTip(CX, CY, minuteDeg, 34);
  const sTip    = handTip(CX, CY, secondDeg, 37);
  const sBase   = handTip(CX, CY, secondDeg + 180, 10); // Gegengewicht

  const timeStr = now.toLocaleTimeString('de-DE', {
    hour: '2-digit',
    minute: '2-digit',
  });
  const dateStr = now.toLocaleDateString('de-DE', {
    weekday: 'long',
    day: '2-digit',
    month: 'long',
    year: 'numeric',
  });

  return (
    <div className={styles.root}>
      <svg
        viewBox="0 0 100 100"
        className={styles.svg}
        aria-label={`Uhrzeit: ${timeStr}`}
        role="img"
      >
        {/* Ziffernblatt */}
        <circle cx={CX} cy={CY} r={R} className={styles.face} />
        <circle cx={CX} cy={CY} r={R} fill="none" className={styles.border} />

        {/* Stundenmarkierungen */}
        {Array.from({ length: 12 }, (_, i) => {
          const angle = (i * 30 - 90) * (Math.PI / 180);
          const big   = i % 3 === 0;
          const outer = R - 1.5;
          const inner = outer - (big ? 6 : 3.5);
          return (
            <line
              key={i}
              x1={CX + outer * Math.cos(angle)}
              y1={CY + outer * Math.sin(angle)}
              x2={CX + inner * Math.cos(angle)}
              y2={CY + inner * Math.sin(angle)}
              className={big ? styles.tickMajor : styles.tickMinor}
            />
          );
        })}

        {/* Stundenzeiger */}
        <line
          x1={CX} y1={CY}
          x2={hTip.x} y2={hTip.y}
          className={styles.hourHand}
        />

        {/* Minutenzeiger */}
        <line
          x1={CX} y1={CY}
          x2={mTip.x} y2={mTip.y}
          className={styles.minuteHand}
        />

        {/* Sekundenzeiger mit Gegengewicht */}
        <line
          x1={sBase.x} y1={sBase.y}
          x2={sTip.x}  y2={sTip.y}
          className={styles.secondHand}
        />

        {/* Mittelpunkt */}
        <circle cx={CX} cy={CY} r={2.5} className={styles.centerDot} />
      </svg>

      <div className={styles.dateText}>{dateStr}</div>
    </div>
  );
}