// Copyright (c) Xenko contributors (https://xenko.com) and Silicon Studio Corp. (https://www.siliconstudio.co.jp)
// Distributed under the MIT license. See the LICENSE.md file in the project root for more information.
//
// Copyright (c) 2010-2013 SharpDX - Alexandre Mutel
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

using System;
using System.Runtime.InteropServices;
using System.Runtime.Serialization;

namespace math
{
    /// <summary>
    /// Structure providing Width, Height and Depth.
    /// </summary>
    [DataContract( Name = "!Size3" )]
    [DataStyle( DataStyle.Compact )]
    [StructLayout( LayoutKind.Sequential )]
    public struct Size3 : IEquatable<Size3>, IComparable<Size3>
    {
        /// <summary>
        /// A zero size with (width, height, depth) = (0,0,0)
        /// </summary>
        public static readonly Size3 Zero = new Size3( 0, 0, 0 );

        /// <summary>
        /// A one size with (width, height, depth) = (1,1,1)
        /// </summary>
        public static readonly Size3 One = new Size3( 1, 1, 1 );

        /// <summary>
        /// A zero size with (width, height, depth) = (0,0,0)
        /// </summary>
        public static readonly Size3 Empty = Zero;

        /// <summary>
        /// Initializes a new instance of the <see cref="Size3" /> struct.
        /// </summary>
        /// <param name="width">The x.</param>
        /// <param name="height">The y.</param>
        /// <param name="depth">The depth.</param>
        public Size3( int width, int height, int depth )
        {
            Width = width;
            Height = height;
            Depth = depth;
        }

        /// <summary>
        /// Width.
        /// </summary>
        [DataMember( Order = 0 )]
        public int Width;

        /// <summary>
        /// Height.
        /// </summary>
        [DataMember( Order = 1 )]
        public int Height;

        /// <summary>
        /// Height.
        /// </summary>
        [DataMember( Order = 2 )]
        public int Depth;

        /// <summary>
        /// Gets a volume size.
        /// </summary>
        private long VolumeSize
        {
            get
            {
                return (long)Width * Height * Depth;
            }
        }

        /// <inheritdoc/>
        public bool Equals( Size3 other )
        {
            return Width == other.Width && Height == other.Height && Depth == other.Depth;
        }

        /// <inheritdoc/>
        public override bool Equals( object obj )
        {
            if( ReferenceEquals( null, obj ) )
                return false;
            return obj is Size3 && Equals( (Size3)obj );
        }

        /// <inheritdoc/>
        public override int GetHashCode()
        {
            unchecked
            {
                int hashCode = Width;
                hashCode = ( hashCode * 397 ) ^ Height;
                hashCode = ( hashCode * 397 ) ^ Depth;
                return hashCode;
            }
        }

        /// <inheritdoc/>
        public int CompareTo( Size3 other )
        {
            return Math.Sign( this.VolumeSize - other.VolumeSize );
        }

        /// <inheritdoc/>
        public override string ToString()
        {
            return string.Format( "({0},{1},{2})", Width, Height, Depth );
        }

        /// <summary>
        /// Implements the &lt;.
        /// </summary>
        /// <param name="left">The left.</param>
        /// <param name="right">The right.</param>
        /// <returns>The result of the operator.</returns>
        public static bool operator <( Size3 left, Size3 right )
        {
            return left.CompareTo( right ) < 0;
        }

        /// <summary>
        /// Implements the &lt;.
        /// </summary>
        /// <param name="left">The left.</param>
        /// <param name="right">The right.</param>
        /// <returns>The result of the operator.</returns>
        public static bool operator <=( Size3 left, Size3 right )
        {
            return left.CompareTo( right ) <= 0;
        }

        /// <summary>
        /// Implements the &lt; or ==.
        /// </summary>
        /// <param name="left">The left.</param>
        /// <param name="right">The right.</param>
        /// <returns>The result of the operator.</returns>
        public static bool operator >( Size3 left, Size3 right )
        {
            return left.CompareTo( right ) > 0;
        }

        /// <summary>
        /// Implements the &gt; or ==.
        /// </summary>
        /// <param name="left">The left.</param>
        /// <param name="right">The right.</param>
        /// <returns>The result of the operator.</returns>
        public static bool operator >=( Size3 left, Size3 right )
        {
            return left.CompareTo( right ) >= 0;
        }

        /// <summary>
        /// Implements the ==.
        /// </summary>
        /// <param name="left">The left.</param>
        /// <param name="right">The right.</param>
        /// <returns>The result of the operator.</returns>
        public static bool operator ==( Size3 left, Size3 right )
        {
            return left.Equals( right );
        }

        /// <summary>
        /// Implements the !=.
        /// </summary>
        /// <param name="left">The left.</param>
        /// <param name="right">The right.</param>
        /// <returns>The result of the operator.</returns>
        public static bool operator !=( Size3 left, Size3 right )
        {
            return !left.Equals( right );
        }

        /// <summary>
        /// Calculates the next up mip-level (*2) of this size.
        /// </summary>
        /// <returns>A next up mip-level Size3.</returns>
        public Size3 Up2( int count = 1 )
        {
            if( count < 0 )
            {
                throw new ArgumentOutOfRangeException( "count", "Must be >= 0" );
            }

            return new Size3( Math.Max( 1, Width << count ), Math.Max( 1, Height << count ), Math.Max( 1, Depth << count ) );
        }

        /// <summary>
        /// Calculates the next down mip-level (/2) of this size.
        /// </summary>
        /// <param name="count">The count.</param>
        /// <returns>A next down mip-level Size3.</returns>
        public Size3 Down2( int count = 1 )
        {
            if( count < 0 )
            {
                throw new ArgumentOutOfRangeException( "count", "Must be >= 0" );
            }

            return new Size3( Math.Max( 1, Width >> count ), Math.Max( 1, Height >> count ), Math.Max( 1, Depth >> count ) );
        }

        /// <summary>
        /// Calculates the mip size based on a direction.
        /// </summary>
        /// <param name="direction">The direction &lt; 0 then <see cref="Down2"/>, &gt; 0  then <see cref="Up2"/>, else this unchanged.</param>
        /// <returns>Size3.</returns>
        public Size3 Mip( int direction )
        {
            return direction == 0 ? this : direction < 0 ? Down2() : Up2();
        }
    }
}