// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System;
using System.Collections.Generic;
using System.IO.Pipelines;
using System.Net.Sockets;
using System.Text;

namespace ClientSample;

public class SocketReceiver
{
    private readonly Socket _socket;
    private readonly SocketAsyncEventArgs _eventArgs = new SocketAsyncEventArgs();
    private readonly SocketAwaitable _awaitable;

    public SocketReceiver(Socket socket, PipeScheduler scheduler)
    {
        _socket = socket;
        _awaitable = new SocketAwaitable(scheduler);
        _eventArgs.UserToken = _awaitable;
        _eventArgs.Completed += (_, e) => ((SocketAwaitable)e.UserToken).Complete(e.BytesTransferred, e.SocketError);
    }

    public SocketAwaitable ReceiveAsync(Memory<byte> buffer)
    {
#if NETCOREAPP
        _eventArgs.SetBuffer(buffer);
#else
        var segment = buffer.GetArray();

        _eventArgs.SetBuffer(segment.Array, segment.Offset, segment.Count);
#endif
        if (!_socket.ReceiveAsync(_eventArgs))
        {
            _awaitable.Complete(_eventArgs.BytesTransferred, _eventArgs.SocketError);
        }

        return _awaitable;
    }
}
