using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Globalization;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace GeoSigmaDrawLib
{
    [Serializable]
    [ComVisible(true)]
    public struct SizeD
    {
        public static readonly SizeD Empty;

        private double width;

        private double height;

        [Browsable(false)]
        public bool IsEmpty
        {
            get
            {
                if (width == 0f)
                {
                    return height == 0f;
                }
                return false;
            }
        }

        public double Width
        {
            get
            {
                return width;
            }
            set
            {
                width = value;
            }
        }

        public double Height
        {
            get
            {
                return height;
            }
            set
            {
                height = value;
            }
        }

        public SizeD(SizeD size)
        {
            width = size.width;
            height = size.height;
        }

        public SizeD(PointD pt)
        {
            width = pt.X;
            height = pt.Y;
        }

        public SizeD(double width, double height)
        {
            this.width = width;
            this.height = height;
        }

        public static SizeD operator +(SizeD sz1, SizeD sz2)
        {
            return Add(sz1, sz2);
        }

        public static SizeD operator -(SizeD sz1, SizeD sz2)
        {
            return Subtract(sz1, sz2);
        }

        public static bool operator ==(SizeD sz1, SizeD sz2)
        {
            if (sz1.Width == sz2.Width)
            {
                return sz1.Height == sz2.Height;
            }
            return false;
        }

        public static bool operator !=(SizeD sz1, SizeD sz2)
        {
            return !(sz1 == sz2);
        }

        public static explicit operator PointD(SizeD size)
        {
            return new PointD(size.Width, size.Height);
        }

        public static SizeD Add(SizeD sz1, SizeD sz2)
        {
            return new SizeD(sz1.Width + sz2.Width, sz1.Height + sz2.Height);
        }

        public static SizeD Subtract(SizeD sz1, SizeD sz2)
        {
            return new SizeD(sz1.Width - sz2.Width, sz1.Height - sz2.Height);
        }

        public override bool Equals(object obj)
        {
            if (!(obj is SizeD))
            {
                return false;
            }
            SizeD sizeF = (SizeD)obj;
            if (sizeF.Width == Width && sizeF.Height == Height)
            {
                return sizeF.GetType().Equals(GetType());
            }
            return false;
        }

        public override int GetHashCode()
        {
            return base.GetHashCode();
        }

        public PointD ToPointF()
        {
            return (PointD)this;
        }

        //public Size ToSize()
        //{
        //    return Size.Truncate(this);
        //}

        public override string ToString()
        {
            return "{Width=" + width.ToString(CultureInfo.CurrentCulture) + ", Height=" + height.ToString(CultureInfo.CurrentCulture) + "}";
        }
    }
}