using System;

namespace func_rocket
{
    public class ControlTask
    {
        public static Turn ControlRocket(Rocket rocket, Vector target)
        {
            var currentAngle = CalculateAngle(rocket, target);

            if (currentAngle == 0)
                return Turn.None;

            return currentAngle > 0 ? Turn.Right : Turn.Left;
        }

        private static double CalculateAngle(Rocket rocket, Vector target)
        {
            var distance = target - rocket.Location;

            var littleAngleDifference = Math.Abs(
                distance.Angle - rocket.Direction) < 0.5||
                Math.Abs(distance.Angle - rocket.Velocity.Angle) < 0.5;

            return littleAngleDifference ?
                (2 * distance.Angle - rocket.Velocity.Angle - rocket.Direction) / 2 :
                distance.Angle - rocket.Direction;
        }
    }
}