using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Text;

namespace StgSharp.Math
{
    [StructLayout(LayoutKind.Explicit)]
    public struct Matrix3x2:IEquatable<Matrix3x2>
    {
        [FieldOffset(0)]
        public Vec2D row1;
        [FieldOffset(8)]
        public Vec2D row2;
        [FieldOffset(16)]
        public Vec2D row3;

        public Matrix3x2(Vec2D r1,Vec2D r2,Vec2D r3)
        {
            row1= r1;
            row2= r2;
            row3= r3;
        }

        public Matrix3x2(
            float a11, float a12,
            float a21, float a22,
            float a31, float a32
            )
        {
            row1 = new Vec2D(a11, a12);
            row2 = new Vec2D(a21, a22);
            row3 = new Vec2D(a31, a32);
        }

        bool IEquatable<Matrix3x2>.Equals(Matrix3x2 other)
        {
            if (this.GetHashCode() != other.GetHashCode())
            {
                return false;
            }
            else
            {
                return
                    this.row1 == other.row1
                    && this.row2 == other.row2
                    && this.row3 == other.row3
                    ;
            }
        }

        public override bool Equals(object obj)
        {
            if (obj == null)
            {
                return false;
            }
            else if (obj.GetType() != typeof(Matrix3x2))
            {
                return false;
            }
            else
            {
                return this.Equals((Matrix3x2)obj);
            }
        }

        public override int GetHashCode()
        {
            return HashCode.Combine(row1, row2, row3);
        }

        public override string ToString()
        {
            return $"{row1}\n{row2}\n{row3}";
        }

        public static Matrix3x2 operator +(Matrix3x2 matrix1, Matrix3x2 matrix2)
        {
            return new Matrix3x2(
                matrix1.row1 + matrix2.row1,
                matrix1.row2 + matrix2.row2,
                matrix1.row3 + matrix2.row3
                );
        }

        public static Matrix3x2 operator -(Matrix3x2 matrix1, Matrix3x2 matrix2)
        {
            return new Matrix3x2(
                matrix1.row1 - matrix2.row1,
                matrix1.row2 - matrix2.row2,
                matrix1.row3 - matrix2.row3
                );
        }

    }
}