using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using static System.Math;

namespace Geo
{
    [Serializable]
    public class Plane
    {
        double a;
        double b;
        double c;
        double d;
        double gammaRad;
        double gammaDeg;

        public double A { get => a; set { a = value; CalcPlane(); } }
        public double B { get => b; set { b = value; CalcPlane(); } }
        public double C { get => c; set { c = value; CalcPlane(); } }
        public double D { get => d; set { d = value; CalcPlane(); } }
        public double AlfaRad { get; private set; }
        public double BetaRad { get; private set; }
        public double GammaRad { get => gammaRad; set { gammaRad = value; RadToDeg(); } }
        public double AlfaDeg { get; private set; }
        public double BetaDeg { get; private set; }
        public double GammaDeg { get => gammaDeg; set { gammaDeg = value; DegToRad(); } }
        public Matrix MrAlfa { get; private set; }
        public Matrix MrBeta { get; private set; }
        public Matrix MrGamma { get; private set; }
        public Vector3d X1 { get; private set; }
        public Vector3d Y1 { get; private set; }
        public Vector3d Z1 { get; private set; }
        public Vector3d Normal { get; private set; }
        public Matrix Mr { get; private set; }
        public Point3d Basis { get; set; }

        public Plane()
        {
            Basis = new Point3d() { X = 0, Y = 0, Z = 0 };

            a = 0;
            b = 0;
            c = 1;
            d = 0;

            CalcPlane();
        }

        public Plane(Point3d pt1, Point3d pt2, Point3d pt3)
        {
            Basis = pt1;

            Vector3d v1 = new Vector3d()
            {
                Vx = pt2.X - pt1.X,
                Vy = pt2.Y - pt1.Y,
                Vz = pt2.Z - pt1.Z
            };

            Vector3d v2 = new Vector3d()
            {
                Vx = pt3.X - pt1.X,
                Vy = pt3.Y - pt1.Y,
                Vz = pt3.Z - pt1.Z
            };

            a = v1.Vy * v2.Vz - v1.Vz * v2.Vy;
            b = v1.Vz * v2.Vx - v1.Vx * v2.Vz;
            c = v1.Vx * v2.Vy - v1.Vy * v2.Vx;
            d = -a * pt1.X - b * pt1.Y - c * pt1.Z;

            CalcPlane();
            RadToDeg();

        }

        public Plane(Point3d pt1, Point3d pt2, Point3d pt3, Point3d bpt)
        {
            Basis = bpt;

            Vector3d v1 = new Vector3d()
            {
                Vx = pt2.X - pt1.X,
                Vy = pt2.Y - pt1.Y,
                Vz = pt2.Z - pt1.Z
            };

            Vector3d v2 = new Vector3d()
            {
                Vx = pt3.X - pt1.X,
                Vy = pt3.Y - pt1.Y,
                Vz = pt3.Z - pt1.Z
            };

            a = v1.Vy * v2.Vz - v1.Vz * v2.Vy;
            b = v1.Vz * v2.Vx - v1.Vx * v2.Vz;
            c = v1.Vx * v2.Vy - v1.Vy * v2.Vx;
            d = -a * pt1.X - b * pt1.Y - c * pt1.Z;

            CalcPlane();
            RadToDeg();

        }

        public double Interpolation(double x, double y)
        {
            if (C == 0) return double.PositiveInfinity;
            else return (-A * x - B * y - D) / C;
        }

        protected void CreatePlane(Point3d pt1, Point3d pt2, Point3d pt3)
        {
            Basis = pt1;

            Vector3d v1 = new Vector3d()
            {
                Vx = pt2.X - pt1.X,
                Vy = pt2.Y - pt1.Y,
                Vz = pt2.Z - pt1.Z
            };

            Vector3d v2 = new Vector3d()
            {
                Vx = pt3.X - pt1.X,
                Vy = pt3.Y - pt1.Y,
                Vz = pt3.Z - pt1.Z
            };

            a = v1.Vy * v2.Vz - v1.Vz * v2.Vy;
            b = v1.Vz * v2.Vx - v1.Vx * v2.Vz;
            c = v1.Vx * v2.Vy - v1.Vy * v2.Vx;
            d = -a * pt1.X - b * pt1.Y - c * pt1.Z;

            CalcPlane();
            RadToDeg();
        }

        protected void CalcPlane()
        {
            Normal = new Vector3d
            {
                Vx = a,
                Vy = b,
                Vz = c
            };

            Intersect();
            CreateMatrix();

        }

        protected void Intersect()
        {
            if ((a == 0 & b == 0) == false)
            {
                Vector3d v3 = new Vector3d { Vx = 0, Vy = 0, Vz = 1 };
                Z1 = new Vector3d(Normal.Unit);
                X1 = new Vector3d((v3 ^ Z1).Unit);
                Y1 = new Vector3d((Z1 ^ X1).Unit);

                AlfaRad = -Acos(X1.Vx);
                BetaRad = -Acos(Z1.Vz);

                //alfaRad = Math.Acos(unitP.Vx);
                //betaRad = Math.Acos(unitNormal.Vz);
            }
        }

        protected void CreateMatrix()
        {
            Vector3d o = new Vector3d();
            o[0] = -X1.Vx * Basis.X - X1.Vy * Basis.Y - X1.Vz * Basis.Z;
            o[1] = -Y1.Vx * Basis.X - Y1.Vy * Basis.Y - Y1.Vz * Basis.Z;
            o[2] = -Z1.Vx * Basis.X - Z1.Vy * Basis.Y - Z1.Vz * Basis.Z;

            Mr = new Matrix(4, 4);

            Mr[0, 0] = X1.Vx; Mr[0, 1] = X1.Vy; Mr[0, 2] = X1.Vz; Mr[0, 3] = o.Vx;
            Mr[1, 0] = Y1.Vx; Mr[1, 1] = Y1.Vy; Mr[1, 2] = Y1.Vz; Mr[1, 3] = o.Vy;
            Mr[2, 0] = Z1.Vx; Mr[2, 1] = Z1.Vy; Mr[2, 2] = Z1.Vz; Mr[2, 3] = o.Vz;
            Mr[3, 0] = 0; Mr[3, 1] = 0; Mr[3, 2] = 0; Mr[3, 3] = 1;

            MrAlfa = new Matrix(3, 3);

            MrAlfa[0, 0] = Cos(AlfaRad); MrAlfa[0, 1] = -Sin(AlfaRad); MrAlfa[0, 2] = 0;
            MrAlfa[1, 0] = Sin(AlfaRad); MrAlfa[1, 1] = Cos(AlfaRad); MrAlfa[1, 2] = 0;
            MrAlfa[2, 0] = 0; MrAlfa[2, 1] = 0; MrAlfa[2, 2] = 0; 

            MrBeta = new Matrix(3, 3);

            MrBeta[0, 0] = 1; MrBeta[0, 1] = 0; MrBeta[0, 2] = 0;
            MrBeta[1, 0] = 0; MrBeta[1, 1] = Cos(BetaRad); MrBeta[1, 2] = -Sin(BetaRad);
            MrBeta[2, 0] = 0; MrBeta[2, 1] = Sin(BetaRad); MrBeta[2, 2] = Cos(BetaRad);

            MrGamma = new Matrix(3, 3);

            MrGamma[0, 0] = Cos(gammaRad); MrGamma[0, 1] = -Sin(gammaRad); MrGamma[0, 2] = 0;
            MrGamma[1, 0] = Sin(gammaRad); MrGamma[1, 1] = Cos(gammaRad); MrGamma[1, 2] = 0;
            MrGamma[2, 0] = 0; MrGamma[2, 1] = 0; MrGamma[2, 2] = 1;
        }

        public Point3d PointInLCS(Point3d pt)
        {
            double[] d1 = new double[] { 0, 0, 0, 1 }; ;
            Vector v1 = new Vector(d1);
            v1[0] = pt.X; v1[1] = pt.Y; v1[2] = pt.Z;

            return new Point3d().FromArray((Mr * v1).ToArray());
        }

        protected double[] MultiplyMtxVec(double[,] _Matrix, double[] _Vector)
        {
            int n = _Vector.Length;
            double[] _Result = new double[n];

            for (int i = 0; i < n; i++)
            {
                for (int j = 0; j < n; j++)
                {
                    _Result[i] += _Matrix[i, j] * _Vector[j];
                }
            }

            return _Result;
        }

        protected void RadToDeg()
        {
            AlfaDeg = AlfaRad * 180 / PI;
            BetaDeg = BetaRad * 180 / PI;
            gammaDeg = gammaRad * 180 / PI;
        }

        protected void DegToRad()
        {
            gammaRad = gammaDeg * 180 / PI;
        }
    }
}