using System;
using System.Collections.Generic;
using System.Data.Common;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.InteropServices;
using System.Security.Cryptography.X509Certificates;
using System.Text;

namespace StgSharp.Math
{
    [StructLayout(LayoutKind.Explicit)]
    public struct Vec4D:IEquatable<Vec4D>
    {
        [FieldOffset(0)]
        public float X;
        [FieldOffset(4)]
        public float Y;
        [FieldOffset(8)]
        public float Z;
        [FieldOffset(12)]
        public float W;

        [FieldOffset(0)]
        public Vec2D Point1;
        [FieldOffset(8)]
        public Vec2D Point2;

        public Vec4D(float x,float y,float z,float w)
        {
            Point1 = new Vec2D();
            Point2 = new Vec2D();

            X = x;
            Y = y;
            Z = z;
            W = w;
        }


        public Vec4D(Vec2D p1,Vec2D p2)
        {
            X= 0;
            Y= 0;
            Z = 0;
            W = 0;
            
            Point1= p1;
            Point2 = p2;
        }
        public override bool Equals(object obj)
        {
            if (obj == null)
            {
                return false;
            }
            else if(obj.GetType() != typeof(Vec4D))
            {
                return false;
            }
            else
            {
                return this == (Vec4D)obj;
            }
        }

        bool IEquatable<Vec4D>.Equals(Vec4D other)
        {
            if (this.GetHashCode() != other.GetHashCode())
            {
                return false;
            }
            else
            {
                return
                    this.Point1 == other.Point1
                    && this.Point2 == other.Point2;
            }
        }

        public override int GetHashCode()
        {
            return HashCode.Combine(X, Y, Z, W);
        }

        public override string ToString()
        {
            return $"{X}\t{Y}\t{Y}\t{Y}";
        }

        public static bool operator ==(Vec4D vec1, Vec4D vec2)
        {
            return vec1.Equals(vec2);
        }

        public static bool operator !=(Vec4D vec1, Vec4D vec2)
        {
            return !vec1.Equals(vec2);
        }

        public static Vec4D operator +(Vec4D vec1, Vec4D vec2)
        {
            return new Vec4D(
                vec1.X + vec2.X,
                vec1.Y + vec2.Y,
                vec1.Z + vec2.Z,
                vec1.W + vec2.W
                );
        }

        public static Vec4D operator -(Vec4D vec1, Vec4D vec2)
        {
            return new Vec4D(
                vec1.X - vec2.X,
                vec1.Y - vec2.Y,
                vec1.Z - vec2.Z,
                vec1.W - vec2.W
                );
        }

        public static float operator *(Vec4D vec1, Vec4D vec2)
        {
            return
                vec1.X * vec2.X
                + vec1.Y * vec2.Y
                + vec1.Z * vec2.Z
                + vec1.W * vec2.W;
        }

        public static Vec4D operator *(Vec4D vec, float x)
        {
            return new Vec4D(vec.X * x, vec.Y * x, vec.Z * x, vec.W * x ) ;
        }

        public static Vec4D operator /(Vec4D vec, float x)
        {
            return new Vec4D(vec.X / x, vec.Y / x, vec.Z / x, vec.W / x);
        }




    }
}