//-----------------------------------------------------------------------
// -----------------------------------------------------------------------
// file="MatrixParallel.Task.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.HighPerformance;

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Numerics;
using System.Runtime.CompilerServices;
using System.Runtime.ExceptionServices;
using System.Runtime.InteropServices;
using System.Threading;

namespace StgSharp.Mathematics
{
    [StructLayout(LayoutKind.Explicit, Size = 32, Pack = 8)]
    public unsafe struct MatrixParallelEnumeration
    {

        [FieldOffset(00)] public MatrixKernel* kernel;

        [FieldOffset(08)] public int begin;
        [FieldOffset(12)] public int end;
        [FieldOffset(16)] public int offset;
        [FieldOffset(20)] public int primStride;
        [FieldOffset(24)] public int secStride;

    }

    [StructLayout(LayoutKind.Explicit, Size = 128, Pack = 8)]
    public unsafe struct MatrixParallelTaskPackage
    {

        [FieldOffset(0)] public MatrixKernel* Left;
        [FieldOffset(24)] public MatrixKernel* Result;
        [FieldOffset(48)] public MatrixKernel* Right;
        [FieldOffset(72)] public ScalarDataPacket* scalerPacket;
        [FieldOffset(80)] public int ComputeMode;
        [FieldOffset(84)] public int primCount;
        [FieldOffset(88)] public int secCount;
        [FieldOffset(108)] public IntPtr executionHandle;

        [FieldOffset(0)] public MatrixParallelEnumeration LeftEnum;
        [FieldOffset(24)] public MatrixParallelEnumeration ResultEnum;
        [FieldOffset(48)] public MatrixParallelEnumeration RightEnum;

    }

    /// <summary>
    ///   Scalar data packet for storing up to 8 parameters as type-erased ulong values Supports
    ///   reference counting for shared usage across multiple tasks Used to separate scalar data
    ///   allocation from task allocation and track batch completion
    /// </summary>
    [StructLayout(LayoutKind.Explicit, Size = 72)]
    public unsafe struct ScalarDataPacket
    {

        public const int MaxScalarCount = 8;
        public const int PacketSize = 64;

        [FieldOffset(0)] private fixed ulong Value[8];

        public ScalarDataPacket()
        {
            Unsafe.SkipInit(out this);
        }

        public ref T GetScalerRef<T>(int index) where T: unmanaged, INumber<T>
        {
            if (index is < 0 or >= MaxScalarCount) {
                throw new IndexOutOfRangeException("ScalarDataPacket index out of range");
            }
            return ref Unsafe.As<ulong, T>(ref Value[index]);
        }

    }
}