namespace Holo.Virtual.Rooms.Pathfinding
{
    using System;

    public static class Rotation
    {
        public static byte Calculate(int X1, int Y1, int X2, int Y2)
        {
            byte Rotation = 0;
            if ((X1 > X2) && (Y1 > Y2))
            {
                return 7;
            }
            if ((X1 < X2) && (Y1 < Y2))
            {
                return 3;
            }
            if ((X1 > X2) && (Y1 < Y2))
            {
                return 5;
            }
            if ((X1 < X2) && (Y1 > Y2))
            {
                return 1;
            }
            if (X1 > X2)
            {
                return 6;
            }
            if (X1 < X2)
            {
                return 2;
            }
            if (Y1 < Y2)
            {
                return 4;
            }
            if (Y1 > Y2)
            {
                Rotation = 0;
            }
            return Rotation;
        }

        public static byte headRotation(byte headRot, int X, int Y, int toX, int toY)
        {
            if (headRot == 2)
            {
                if ((X <= toX) && (Y < toY))
                {
                    return 3;
                }
                if ((X <= toX) && (Y > toY))
                {
                    return 5;
                }
                if ((X < toX) && (Y == toY))
                {
                    return 2;
                }
            }
            else if (headRot == 4)
            {
                if ((X > toX) && (Y <= toY))
                {
                    return 5;
                }
                if ((X < toX) && (Y <= toY))
                {
                    return 3;
                }
                if ((X == toX) && (Y < toY))
                {
                    return 4;
                }
            }
            else if (headRot == 6)
            {
                if ((X >= toX) && (Y > toY))
                {
                    return 7;
                }
                if ((X >= toX) && (Y < toY))
                {
                    return 5;
                }
                if ((X > toX) && (Y == toY))
                {
                    return 6;
                }
            }
            else if (headRot == 0)
            {
                if ((X > toX) && (Y >= toY))
                {
                    return 9;
                }
                if ((X < toX) && (Y >= toY))
                {
                    return 1;
                }
                if ((X == toX) && (Y > toY))
                {
                    return 0;
                }
            }
            return 10;
        }
    }
}