enum AngleUnit {
  degrees, // 0° - 360°
  mils,    // 0 - 6400 NATO Mils (₥)
  dual,    // Both: 045° (0800 ₥)
}

extension AngleUnitExtension on AngleUnit {
  String formatHeading(double deg, {bool includeLabel = false}) {
    return AngleFormatter.format(deg, this, includeLabel: includeLabel);
  }
}

class AngleFormatter {
  static const double degToMilsNato = 17.7777777778; // 6400 mils / 360 deg

  static double toMils(double deg) {
    return (deg * degToMilsNato) % 6400;
  }

  static double fromMils(double mils) {
    return (mils / degToMilsNato) % 360;
  }

  static String format(double deg, AngleUnit unit, {bool includeLabel = true}) {
    final cleanDeg = (deg % 360 + 360) % 360;
    final milsVal = (cleanDeg * degToMilsNato).round() % 6400;
    final degStr = '${cleanDeg.toStringAsFixed(1)}°';
    final milsStr = '${milsVal.toString().padLeft(4, '0')} ₥';

    switch (unit) {
      case AngleUnit.degrees:
        return includeLabel ? 'الاتجاه: $degStr' : degStr;
      case AngleUnit.mils:
        return includeLabel ? 'الاتجاه: $milsStr' : milsStr;
      case AngleUnit.dual:
        return includeLabel ? 'الاتجاه: $degStr ($milsStr)' : '$degStr ($milsStr)';
    }
  }

  static String unitLabel(AngleUnit unit) {
    switch (unit) {
      case AngleUnit.degrees:
        return 'الدرجات (Degrees °)';
      case AngleUnit.mils:
        return 'الميل العسكري (NATO Mils ₥)';
      case AngleUnit.dual:
        return 'عرض مزدوج (درجات + ميل)';
    }
  }
}