//-----------------------------------------------------------------------
// -----------------------------------------------------------------------
// 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 System;
using System.Collections.Concurrent;
using System.Diagnostics;
using System.Diagnostics.Contracts;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading;

namespace StgSharp.MVVM
{
    public class ViewPort
    {

        private static readonly ConcurrentDictionary<IntPtr, ViewPort> _handleToViewPortIndex = [];
        private int _width, _height, _newWidth, _newHeight;

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

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

        public unsafe int Height
        {
[MethodImpl(MethodImplOptions.AggressiveInlining)]
            get => _height;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
            internal set => Interlocked.Exchange(ref _height, value);
        }

        public unsafe int Width
        {
[MethodImpl(MethodImplOptions.AggressiveInlining)]
            get => _width;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
            internal set => Interlocked.Exchange(ref _width, value);
        }

        public IntPtr GraphicHandle { get; internal set; }

        public IntPtr Monitor { get; internal set; }

        public IntPtr ViewPortHandle { get; private set; }

        public string Name { get; set; }

        // [BlueprintNodeExecution]
        [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);
        }

    }
}