//-----------------------------------------------------------------------
//-----------------------------------------------------------------------
//     file="ViewPort.cs"
//     Project: StgSharp
//     AuthorGroup: Nitload Space
//     Copyright (c) Nitload Space. All rights reserved.
//     
//     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 StgSharp.Graphics;
using StgSharp.Math;
using StgSharp.Threading;

using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;

namespace StgSharp.MVVM
{
    public class ViewPort
    {

        private static ConcurrentDictionary<IntPtr, ViewPort> _handleToViewPortIndex = new ConcurrentDictionary<IntPtr, ViewPort>(
            );
        private int _shouldCloseMask, _closeRequestedMask;
        private int _width, _height, _newWidth, _newHeight;

        internal ViewPort()
        {
            _newHeight = 600;
            _newWidth = 800;
            FlushSize();
            Name = new StackFrame( 1, false ).
                GetMethod()!.DeclaringType!.Name;
            Monitor = IntPtr.Zero;
            ViewPortID = InternalIO.glfwCreateWindow(
                _newWidth, _newHeight, Encoding.UTF8.GetBytes( Name ), Monitor,
                IntPtr.Zero );
            if( ViewPortID == IntPtr.Zero ) {
                throw new InvalidOperationException(
                    "Unable to create viewport handle." );
            }
            _handleToViewPortIndex.TryAdd( ViewPortID, this );
        }

        public ViewPort(int width, int height, string name, IntPtr monitor )
        {
            _newWidth = width;
            _newHeight = height;
            FlushSize();
            Name = name;
            Monitor = monitor;
            ViewPortID = InternalIO.glfwCreateWindow(
                _newWidth, _newHeight, Encoding.UTF8.GetBytes( Name ), Monitor,
                IntPtr.Zero );
            if( ViewPortID == IntPtr.Zero ) {
                throw new InvalidOperationException(
                    "Unable to create viewport handle." );
            }
            _handleToViewPortIndex.TryAdd( ViewPortID, this );
        }

        public unsafe int Height
        {
            get { return _height; }
            internal set { Interlocked.Exchange( ref _height, value ); }
        }

        public unsafe int Width
        {
            get { return _width; }
            internal set { Interlocked .Exchange( ref _width, value ); }
        }

        public IntPtr GraphicHandle
        {
            get;
            internal set;
        }

        public IntPtr Monitor
        {
            get;
            internal set;
        }

        public IntPtr ViewPortID
        {
            get;
            private set;
        }

        public string Name
        {
            get;
            set;
        }

        [MethodImpl( MethodImplOptions.AggressiveInlining )]
        public static bool GetExistedViewPort(
            IntPtr handle,
            out ViewPort port )
        {
            return _handleToViewPortIndex.TryGetValue( handle, out port );
        }

        internal unsafe void FlushSize()
        {
            Interlocked.Exchange( ref _height, _newHeight );
            Interlocked.Exchange( ref _width, _newWidth );
        }

        internal void RequestFlushSizeInNextFrame( int width, int height )
        {
            Interlocked.Exchange( ref _newHeight, height );
            Interlocked .Exchange( ref _newWidth, width );
        }

    }
}