using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;

namespace StitchATon2.Infra.Buffers;

internal sealed unsafe class UnmanagedMemory<T> : IBuffer<T> where T : unmanaged
{
    private readonly void* _pointer;
    private readonly int _count;

    public ref T this[int index] => ref Unsafe.AsRef<T>((T*)_pointer + index); // *((T*)_pointer + index);

    public Span<T> Span => new(_pointer, _count);

    public UnmanagedMemory(int count)
    {
        _pointer = NativeMemory.Alloc((nuint)count, (nuint)Unsafe.SizeOf<T>());
        _count = count;
    }
    
    ~UnmanagedMemory() => Dispose();

    public void Dispose()
    {
        NativeMemory.Free(_pointer);
        GC.SuppressFinalize(this);
    }
}