//-----------------------------------------------------------------------
// -----------------------------------------------------------------------
// file="Matrix_T.GC"
// Project: StgSharp
// AuthorGroup: Nitload
// Copyright (c) Nitload. All rights reserved.
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// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
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using StgSharp.HighPerformance;
using StgSharp.Mathematics;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Numerics;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace StgSharp.Mathematics.Numeric
{
    internal unsafe partial class GCMatrix<T> : Matrix<T> where T : unmanaged, INumber<T>
    {

        private readonly MatrixKernel<T>* _buffer;

        public GCMatrix(int column, int row)
        {
            KernelColumnLength = (column + 3) / 4;
            KernelRowLength = (row + 3) / t_count;
            ColumnLength = column;
            RowLength = row;
            _buffer = (MatrixKernel<T>*)NativeMemory.AlignedAlloc((nuint)(column * row * sizeof(T)), (nuint)World.DefaultSIMDAlignment);
        }

        public override ref T this[int column, int row]
        {
            get
            {
                AssertIndex(column, row);
                int kernelColumn = column / 4, c = column % 4;
                int kernelRow = row / t_count, r = row % t_count;
                ref MatrixKernel<T> kernel = ref _buffer[kernelColumn + KernelColumnLength * kernelRow];
                return ref kernel[c, r];
            }
        }

        public override Matrix<T> this[ReadOnlySpan<MatrixIndex> column, ReadOnlySpan<MatrixIndex> row]
        {
            get => throw new NotImplementedException();
            set => throw new NotImplementedException();
        }

        internal override unsafe MatrixKernel<T>* Buffer
        {
            [MethodImpl(MethodImplOptions.AggressiveInlining)]
            get => _buffer;
        }

        public override unsafe ref MatrixKernel<T> GetMatrixKernel(int column, int row)
        {
            AssertIndex(column, row);
            int kernelColumn = column / 4;
            int kernelRow = row / t_count;
            return ref _buffer[kernelColumn + (KernelColumnLength * kernelRow)];
        }

        public override ref T UnsafeIndex(int column, int row)
        {
            int kernelColumn = column / 4, c = column % 4;
            int kernelRow = row / t_count, r = row % t_count;
            ref MatrixKernel<T> kernel = ref _buffer[kernelColumn + (KernelColumnLength * kernelRow)];
            return ref kernel[c, r];
        }

        ~GCMatrix()
        {
            NativeMemory.AlignedFree(_buffer);
        }

        #region enumeration

        public override unsafe MatrixSegmentEnumeration<T> ColumnEnumeration
        {
            [MethodImpl(MethodImplOptions.AggressiveInlining)]
            get => new MatrixSegmentEnumeration<T>(_buffer, KernelColumnLength, KernelColumnLength * KernelRowLength, 1,
                                                   KernelColumnLength);
        }

        public override unsafe MatrixSegmentEnumeration<T> GetRowEnumeration()
        {
            return new MatrixSegmentEnumeration<T>(_buffer, 1, KernelColumnLength, KernelColumnLength, KernelRowLength);
        }

        public override unsafe MatrixSegmentEnumeration<T> SequentialEnumeration
        {
            [MethodImpl(MethodImplOptions.AggressiveInlining)]
            get => new MatrixSegmentEnumeration<T>(_buffer, KernelRowLength * KernelColumnLength,
                                                   KernelColumnLength * KernelRowLength, 1,
                                                   KernelRowLength * KernelColumnLength);
        }

        #endregion
    }
}