// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

using System;
using System.Net;
using System.Runtime.InteropServices;

namespace Libuv.Internal
{
  public class UvTcpHandle : UvStreamHandle
  {
    public UvTcpHandle(ILibuvTrace logger) : base(logger)
    {
    }

    public void Init(UvLoopHandle loop, Action<Action<IntPtr>, IntPtr> queueCloseHandle)
    {
      CreateHandle(
        loop.Libuv,
        loop.ThreadId,
        loop.Libuv.handle_size(LibuvFunctions.HandleType.TCP), queueCloseHandle);

      _uv.tcp_init(loop, this);
    }

    public void Open(IntPtr fileDescriptor)
    {
      _uv.tcp_open(this, fileDescriptor);
    }

    public void Bind(IPEndPoint endPoint)
    {
      var addressText = endPoint.Address.ToString();

      _uv.ip4_addr(addressText, endPoint.Port, out var addr, out var error1);

      if (error1 != null)
      {
        _uv.ip6_addr(addressText, endPoint.Port, out addr, out var error2);
        if (error2 != null) throw error1;

        if (endPoint.Address.ScopeId != addr.ScopeId)
          // IPAddress.ScopeId cannot be less than 0 or greater than 0xFFFFFFFF
          // https://msdn.microsoft.com/en-us/library/system.net.ipaddress.scopeid(v=vs.110).aspx
          addr.ScopeId = (uint)endPoint.Address.ScopeId;
      }

      _uv.tcp_bind(this, ref addr, 0);
    }

    public IPEndPoint GetPeerIPEndPoint()
    {
      int namelen = Marshal.SizeOf<SockAddr>();
      _uv.tcp_getpeername(this, out var socketAddress, ref namelen);

      return socketAddress.GetIPEndPoint();
    }

    public IPEndPoint GetSockIPEndPoint()
    {
      int namelen = Marshal.SizeOf<SockAddr>();
      _uv.tcp_getsockname(this, out var socketAddress, ref namelen);

      return socketAddress.GetIPEndPoint();
    }

    public void NoDelay(bool enable)
    {
      _uv.tcp_nodelay(this, enable);
    }
  }
}