using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

using Sog;
using Sog.Service;
using ProtoCSStruct;

namespace Game
{
    public class MoveUtils
    {
        public static PF.Vector3 GetVector3FromPosition(DBPosition pos)
        {
            return new PF.Vector3((float)pos.X / 1000, (float)pos.Y / 1000, (float)pos.Z / 1000);
        }

        public static DBPosition GetPositionFromVector3(PF.Vector3 pos)
        {
            return new DBPosition() { X = (int)(pos.x*1000), Y = (int)(pos.y*1000), Z = (int)(pos.z*1000)};
        }

        public static bool IsPosSame(DBPosition src, DBPosition dst)
        {
            return src.X == dst.X && src.Y == dst.Y && src.Z == dst.Z;
        }

        //不开方的计算，提高效率
        public static long GetDistanceSquare3D(ref DBPosition pos1, ref DBPosition pos2)
        {
            long xDis = pos1.X - pos2.X;
            long yDis = pos1.Y - pos2.Y;
            long zDis = pos1.Z - pos2.Z;

            return xDis * xDis + yDis * yDis + zDis * zDis;
        }

        public static long GetDistance3D(ref DBPosition pos1, ref DBPosition pos2)
        {
            long disSquare = GetDistanceSquare3D(ref pos1, ref pos2);

            return (long)Sog.MathUtils.FastSqrtIEEE((double)disSquare);
        }

        //不开方的计算，提高效率
        public static long GetDistanceSquare2D(ref DBPosition pos1, ref DBPosition pos2)
        {
            long xDis = pos1.X - pos2.X;
            long zDis = pos1.Z - pos2.Z;

            return xDis * xDis + zDis * zDis;
        }

        public static long GetDistance2D(ref DBPosition pos1, ref DBPosition pos2)
        {
            long disSquare = GetDistanceSquare3D(ref pos1, ref pos2);

            return (long)Sog.MathUtils.FastSqrtIEEE((double)disSquare);
        }

        public static int ComputeCoordinate(int iDeltaX, int x, int iDist1, int iDist2)
        {
            long tmpDeltaX;
            int tmpX;
            long tmpDist1;
            long tmpDist2;
            int iRet = 0;

            tmpDeltaX = iDeltaX;
            tmpX = x;
            tmpDist1 = iDist1;
            tmpDist2 = iDist2;

            if (tmpDist2 == 0)
            {
                tmpDist2 = 1;
            }
            iRet = (int)((tmpDeltaX * tmpDist1) / tmpDist2) + tmpX;
            return iRet;
        }
    }
}