//-----------------------------------------------------------------------
// -----------------------------------------------------------------------
// file="Matrix.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, 
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// ARISING FROM, OUT OF OR IN CONNECTION WITH 
// THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
using StgSharp.HighPerformance;

using System;
using System.Numerics;

namespace StgSharp.Mathematics
{
    public abstract unsafe partial class Matrix<T> where T: unmanaged, INumber<T>
    {

        private protected readonly int t_count = 16 / sizeof(T);

        private protected readonly int t_size = sizeof(T);

        public abstract ref T this[int column, int row]
        {
            get;
        }

        public abstract unsafe Matrix<T> this[ReadOnlySpan<MatrixIndex> column, ReadOnlySpan<MatrixIndex> row]
        {
            get;
            set;
        }

        public abstract MatrixKernel* GetMatrixKernel(int column, int row);

        [Obsolete("This method does not contain boarder check, so be careful on size or use indexer instead.", false)]
        public abstract T* UnsafeIndex(int column, int row);

    }

    internal unsafe class GCMatrix<T> : Matrix<T> where T: unmanaged, INumber<T>
    {

        private MatrixKernel[,] buffer;

        public GCMatrix(int column, int row)
        {
            int columnSet = (column + 3) / 4;
            int rowSet = (row + 3) / 4;
            buffer = new MatrixKernel[columnSet, rowSet];
        }

        public override ref T this[int column, int row]
        {
            get
            {
                int kernelColumn = column / 4, c = column % 4;
                int kernelRow = row / t_count,r = row % t_count;
                ref MatrixKernel kernel = ref buffer[kernelColumn, kernelRow];
                return ref kernel.UnsafeIndex<T>(c, r);
            }
        }

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

        public override unsafe MatrixKernel* GetMatrixKernel(int column, int row)
        {
            throw new NotImplementedException();
        }

        public override unsafe T* UnsafeIndex(int column, int row)
        {
            throw new NotImplementedException();
        }

    }

    internal unsafe class HlsfMatrix<T> : Matrix<T> where T: unmanaged, INumber<T>
    {

        public override ref T this[int column, int row] => throw new NotImplementedException();

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

        public override unsafe MatrixKernel* GetMatrixKernel(int column, int row)
        {
            throw new NotImplementedException();
        }

        public override unsafe T* UnsafeIndex(int column, int row)
        {
            throw new NotImplementedException();
        }

    }
}