// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
namespace System.Windows.Media.Media3D
{
    /// <summary>
    /// Size3D - A value type which defined a size in terms of non-negative width, 
    /// length, and height.
    /// </summary>
    public partial struct Size3D
    {
        #region Constructors
 
        /// <summary>
        /// Constructor which sets the size's initial values.  Values must be non-negative.
        /// </summary>
        /// <param name="x">X dimension of the new size.</param>
        /// <param name="y">Y dimension of the new size.</param>
        /// <param name="z">Z dimension of the new size.</param>
        public Size3D(double x, double y, double z)
        {
            if (x < 0 || y < 0 || z < 0)
            {
                throw new System.ArgumentException(SR.Size3D_DimensionCannotBeNegative);
            }
 
 
            _x = x;
            _y = y;
            _z = z;
        }
 
        #endregion Constructors
 
        #region Statics
 
        /// <summary>
        /// Empty - a static property which provides an Empty size.  X, Y, and Z are 
        /// negative-infinity.  This is the only situation
        /// where size can be negative.
        /// </summary>
        public static Size3D Empty
        {
            get
            {
                return s_empty;
            }
        }
 
        #endregion Statics
            
        #region Public Methods and Properties
 
        /// <summary>
        /// IsEmpty - this returns true if this size is the Empty size.
        /// Note: If size is 0 this Size3D still contains a 0, 1, or 2 dimensional set
        /// of points, so this method should not be used to check for 0 volume.
        /// </summary>
        public bool IsEmpty
        {
            get
            {
                return _x < 0;
            }
        }
 
        /// <summary>
        /// Size in X dimension. Default is 0, must be non-negative.
        /// </summary>
        public double X
        {
            get
            {
                return _x;
            }
            set
            {
                if (IsEmpty)
                {
                    throw new System.InvalidOperationException(SR.Size3D_CannotModifyEmptySize);
                }
                
                if (value < 0)
                {
                    throw new System.ArgumentException(SR.Size3D_DimensionCannotBeNegative);
                }
 
                _x = value;
            }
        }
 
        /// <summary>
        /// Size in Y dimension. Default is 0, must be non-negative.
        /// </summary>
        public double Y
        {
            get
            {
                return _y;
            }
            set
            {
                if (IsEmpty)
                {
                    throw new System.InvalidOperationException(SR.Size3D_CannotModifyEmptySize);
                }
                
                if (value < 0)
                {
                    throw new System.ArgumentException(SR.Size3D_DimensionCannotBeNegative);
                }
 
                _y = value;
            }
        }
 
        
        /// <summary>
        /// Size in Z dimension. Default is 0, must be non-negative.
        /// </summary>
        public double Z
        {
            get
            {
                return _z;
            }
            set
            {
                if (IsEmpty)
                {
                    throw new System.InvalidOperationException(SR.Size3D_CannotModifyEmptySize);
                }
                
                if (value < 0)
                {
                    throw new System.ArgumentException(SR.Size3D_DimensionCannotBeNegative);
                }
 
                _z = value;
            }
        }
 
        #endregion Public Methods
 
        #region Public Operators
 
        /// <summary>
        /// Explicit conversion to Vector.
        /// </summary>
        /// <param name="size">The size to convert to a vector.</param>
        /// <returns>A vector equal to this size.</returns>
        public static explicit operator Vector3D(Size3D size)
        {
            return new Vector3D(size._x, size._y, size._z);
        }
 
        /// <summary>
        /// Explicit conversion to point.
        /// </summary>
        /// <param name="size">The size to convert to a point.</param>
        /// <returns>A point equal to this size.</returns>
        public static explicit operator Point3D(Size3D size)
        {
            return new Point3D(size._x, size._y, size._z);
        }
 
        #endregion Public Operators
 
        #region Private Methods
 
        private static Size3D CreateEmptySize3D()
        {
            Size3D empty = new Size3D
            {
                // Can't use setters because they throw on negative values
                _x = Double.NegativeInfinity,
                _y = Double.NegativeInfinity,
                _z = Double.NegativeInfinity
            };
            return empty;
        }
 
        #endregion Private Methods
            
        #region Private Fields
 
        private static readonly Size3D s_empty = CreateEmptySize3D();
 
        #endregion Private Fields
    }
}