using System;

namespace MinecraftClient.Mapping
{
    public static class DirectionExtensions
    {
        public static Direction GetOpposite(this Direction direction)
        {
            switch (direction)
            {
                case Direction.SouthEast:
                    return Direction.NorthEast;
                case Direction.SouthWest:
                    return Direction.NorthWest;

                case Direction.NorthEast:
                    return Direction.SouthEast;
                case Direction.NorthWest:
                    return Direction.SouthWest;

                case Direction.West:
                    return Direction.East;
                case Direction.East:
                    return Direction.West;

                case Direction.North:
                    return Direction.South;
                case Direction.South:
                    return Direction.North;

                case Direction.Down:
                    return Direction.Up;
                case Direction.Up:
                    return Direction.Down;
                default:
                    return Direction.Up;

            }
        }
        

        public static Direction[] HORIZONTAL =
        {
            Direction.South,
            Direction.West,
            Direction.North,
            Direction.East
        };

        public static Direction FromRotation(double rotation)
        {
            double floor = Math.Floor((rotation / 90.0) + 0.5);
            int value = (int)floor & 3;

            return FromHorizontal(value);
        }

        public static Direction FromHorizontal(int value)
        {
            return HORIZONTAL[Math.Abs(value % HORIZONTAL.Length)];
        }
    }
}