/*
 * Author: Andrey Pokidov
 * License: Apache-2.0
 * Date: 18 Nov 2024
 */

namespace BGC
{
    public class DegreeFP64
    {
        public const double RADIANS_IN_DEGREE = 1.74532925199432958E-2;
        public const double TURNS_IN_DEGREE = 2.77777777777777778E-3;

        public static double ToRadians(double degrees)
        {
            return degrees * RADIANS_IN_DEGREE;
        }

        public static double ToTurns(double degrees)
        {
            return degrees * TURNS_IN_DEGREE;
        }

        public static double ToUnits(double degrees, AngleUnit toUnit)
        {
            if (toUnit == AngleUnit.RADIANS)
            {
                return degrees * RADIANS_IN_DEGREE;
            }

            if (toUnit == AngleUnit.TURNS)
            {
                return degrees * TURNS_IN_DEGREE;
            }

            return degrees;
        }

        public static double Normalize(double degrees, AngleRange range)
        {
            if (range == AngleRange.UNSIGNED_RANGE)
            {
                if (0.0 <= degrees && degrees < 360.0)
                {
                    return degrees;
                }
            }
            else
            {
                if (-180.0 < degrees && degrees <= 180.0)
                {
                    return degrees;
                }
            }

            double turns = degrees * TURNS_IN_DEGREE;

            turns -= Math.Floor(turns);

            if (range == AngleRange.SIGNED_RANGE && turns > 0.5)
            {
                turns -= 1.0;
            }

            return turns * 360.0;
        }
    }
}