"use client";

interface AnalogClockProps {
  time: Date;
  theme: "light" | "dark" | "custom";
  timezone?: string;
  customColor?: string; // 사용자 지정 색상
}

/**
 * 아날로그 시계 컴포넌트
 * - SVG 기반 아날로그 시계
 * - 시침, 분침, 초침 애니메이션
 * - 테마별 색상 지원
 * - 타임존 표시
 */
export function AnalogClock({ time, theme, timezone, customColor }: AnalogClockProps) {
  const hours = time.getHours() % 12;
  const minutes = time.getMinutes();
  const seconds = time.getSeconds();

  // 각도 계산 (12시 방향을 0도로, 시계방향으로 회전)
  const secondAngle = seconds * 6 - 90; // 6도씩 회전 (360/60)
  const minuteAngle = minutes * 6 + seconds * 0.1 - 90; // 6도씩 + 초당 0.1도
  const hourAngle = hours * 30 + minutes * 0.5 - 90; // 30도씩 + 분당 0.5도

  // 테마별 색상
  const colors = getThemeColors(theme, customColor);

  // 타임존 라벨
  const timezoneLabel = timezone ? getTimezoneLabel(timezone) : "";

  return (
    <div className="flex h-full flex-col items-center justify-center p-0.5">
      <svg viewBox="0 0 200 200" className="h-full w-full">
        {/* 시계판 배경 */}
        <circle cx="100" cy="100" r="98" fill={colors.background} stroke={colors.border} strokeWidth="2" />

        {/* 눈금 표시 */}
        {[...Array(60)].map((_, i) => {
          const angle = (i * 6 - 90) * (Math.PI / 180);
          const isHour = i % 5 === 0;
          const startRadius = isHour ? 85 : 90;
          const endRadius = 95;

          return (
            <line
              key={i}
              x1={100 + startRadius * Math.cos(angle)}
              y1={100 + startRadius * Math.sin(angle)}
              x2={100 + endRadius * Math.cos(angle)}
              y2={100 + endRadius * Math.sin(angle)}
              stroke={colors.tick}
              strokeWidth={isHour ? 2 : 1}
            />
          );
        })}

        {/* 숫자 표시 (12시, 3시, 6시, 9시) */}
        {[12, 3, 6, 9].map((num, idx) => {
          const angle = (idx * 90 - 90) * (Math.PI / 180);
          const radius = 70;
          const x = 100 + radius * Math.cos(angle);
          const y = 100 + radius * Math.sin(angle);

          return (
            <text
              key={num}
              x={x}
              y={y}
              textAnchor="middle"
              dominantBaseline="middle"
              fontSize="16"
              fontWeight="bold"
              fill={colors.number}
            >
              {num}
            </text>
          );
        })}

        {/* 시침 (짧고 굵음) */}
        <line
          x1="100"
          y1="100"
          x2={100 + 40 * Math.cos((hourAngle * Math.PI) / 180)}
          y2={100 + 40 * Math.sin((hourAngle * Math.PI) / 180)}
          stroke={colors.hourHand}
          strokeWidth="5"
          strokeLinecap="round"
        />

        {/* 분침 (중간 길이) */}
        <line
          x1="100"
          y1="100"
          x2={100 + 60 * Math.cos((minuteAngle * Math.PI) / 180)}
          y2={100 + 60 * Math.sin((minuteAngle * Math.PI) / 180)}
          stroke={colors.minuteHand}
          strokeWidth="3"
          strokeLinecap="round"
        />

        {/* 초침 (가늘고 긴) */}
        <line
          x1="100"
          y1="100"
          x2={100 + 75 * Math.cos((secondAngle * Math.PI) / 180)}
          y2={100 + 75 * Math.sin((secondAngle * Math.PI) / 180)}
          stroke={colors.secondHand}
          strokeWidth="1.5"
          strokeLinecap="round"
        />

        {/* 중심점 */}
        <circle cx="100" cy="100" r="4" fill={colors.center} />
        <circle cx="100" cy="100" r="2" fill={colors.background} />
      </svg>

      {/* 타임존 표시 */}
      {timezoneLabel && (
        <div className="mt-0 text-center text-[8px] font-medium" style={{ color: colors.number }}>
          {timezoneLabel}
        </div>
      )}
    </div>
  );
}

/**
 * 타임존 라벨 반환
 */
function getTimezoneLabel(timezone: string): string {
  const timezoneLabels: Record<string, string> = {
    "Asia/Seoul": "서울 (KST)",
    "Asia/Tokyo": "도쿄 (JST)",
    "Asia/Shanghai": "베이징 (CST)",
    "America/New_York": "뉴욕 (EST)",
    "America/Los_Angeles": "LA (PST)",
    "Europe/London": "런던 (GMT)",
    "Europe/Paris": "파리 (CET)",
    "Australia/Sydney": "시드니 (AEDT)",
  };

  return timezoneLabels[timezone] || timezone.split("/")[1];
}

/**
 * 테마별 색상 반환
 */
function getThemeColors(theme: string, customColor?: string) {
  if (theme === "custom" && customColor) {
    // 사용자 지정 색상 사용 (약간 밝게/어둡게 조정)
    const lighterColor = adjustColor(customColor, 40);
    const darkerColor = adjustColor(customColor, -40);

    return {
      background: lighterColor,
      border: customColor,
      tick: customColor,
      number: darkerColor,
      hourHand: darkerColor,
      minuteHand: customColor,
      secondHand: "#ef4444",
      center: darkerColor,
    };
  }

  const themes = {
    light: {
      background: "#ffffff",
      border: "#d1d5db",
      tick: "#9ca3af",
      number: "#374151",
      hourHand: "#1f2937",
      minuteHand: "#4b5563",
      secondHand: "#ef4444",
      center: "#1f2937",
    },
    dark: {
      background: "#1f2937",
      border: "#4b5563",
      tick: "#6b7280",
      number: "#f9fafb",
      hourHand: "#f9fafb",
      minuteHand: "#d1d5db",
      secondHand: "#ef4444",
      center: "#f9fafb",
    },
    custom: {
      background: "#e0e7ff",
      border: "#6366f1",
      tick: "#818cf8",
      number: "#4338ca",
      hourHand: "#4338ca",
      minuteHand: "#6366f1",
      secondHand: "#ef4444",
      center: "#4338ca",
    },
  };

  return themes[theme as keyof typeof themes] || themes.light;
}

/**
 * 색상 밝기 조정
 */
function adjustColor(color: string, amount: number): string {
  const clamp = (num: number) => Math.min(255, Math.max(0, num));

  const hex = color.replace("#", "");
  const r = parseInt(hex.substring(0, 2), 16);
  const g = parseInt(hex.substring(2, 4), 16);
  const b = parseInt(hex.substring(4, 6), 16);

  const newR = clamp(r + amount);
  const newG = clamp(g + amount);
  const newB = clamp(b + amount);

  return `#${newR.toString(16).padStart(2, "0")}${newG.toString(16).padStart(2, "0")}${newB.toString(16).padStart(2, "0")}`;
}
