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

namespace StgSharp.Math
{

    [StructLayout(LayoutKind.Explicit)]
    public struct Vec2D:IEquatable<Vec2D>
    {
        [FieldOffset(0)]
        public float X;
        [FieldOffset(sizeof(float))]
        public float Y;

        public Vec2D(float x,float y)
        {
            X = x;
            Y = y;
        }

        public bool Equals(Vec2D other)
        {
            if (this.GetHashCode() != other.GetHashCode())
            {
                return false;
            }
            else
            {
                return this.X == other.X && this.Y == other.Y;
            }
        }

        public override bool Equals(object obj)
        {
            if (obj == null)
            {
                return false;
            }
            else if (obj.GetType() != typeof(Vec2D))
            {
                return false;
            }
            else
            {
                return this.Equals((Vec2D)obj);
            }
        }

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

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

        public static bool operator ==(Vec2D vec1, Vec2D vec2)
        {
            return vec1.X==vec2.X && vec1.Y==vec2.Y;
        }

        public static bool operator !=(Vec2D vec1, Vec2D vec2)
        {
            return !(vec1.X == vec2.X && vec1.Y == vec2.Y);
        }

        public static Vec2D operator +(Vec2D vec1, Vec2D vec2)
        {
            return new Vec2D(vec1.X + vec2.X, vec1.Y + vec2.Y);
        }

        public static Vec2D operator -(Vec2D vec1, Vec2D vec2)
        {
            return new Vec2D(vec1.X + vec2.X, vec1.Y + vec2.Y);
        }

        public static float operator *(Vec2D vec1, Vec2D vec2)
        {
            return vec1.X * vec2.X + vec1.Y*vec2.Y;
        }

        public static Vec2D operator *(Vec2D vec, float x)
        {
            return new Vec2D(vec.X * x, vec.Y * x);
        }

        public static Vec2D operator /(Vec2D vec, float x)
        {
            return new Vec2D(vec.X/x, vec.Y/x);
        }

        
    }
}