//go:build windows

package netforward

import (
	"net"
	"os"
	"runtime"
	"syscall"
	"unsafe"
)

func SetTcpInfo(conn *net.TCPConn, usingKeepAlive bool, keepAliveIdel, keepAlivePeriod, keepAliveCount, userTimeout int) error {
	if usingKeepAlive {
		rawConn, err := conn.SyscallConn()
		if err != nil {
			return err
		}
		err = rawConn.Control(func(fd uintptr) {
			ka := syscall.TCPKeepalive{
				OnOff:    1,
				Time:     uint32(keepAliveIdel),
				Interval: uint32(keepAlivePeriod),
			}
			ret := uint32(0)
			size := uint32(unsafe.Sizeof(ka))
			err = syscall.WSAIoctl(syscall.Handle(fd), syscall.SIO_KEEPALIVE_VALS, (*byte)(unsafe.Pointer(&ka)), size, nil, 0, &ret, nil, 0)
			runtime.KeepAlive(fd)
		})
		return os.NewSyscallError("wsaioctl", err)
	}
	return conn.SetKeepAlive(false)
}

func SetReUseAddr(fd uintptr) {
	syscall.SetsockoptInt(syscall.Handle(fd), syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
}

func ControlSetReUseAddr(network, address string, c syscall.RawConn) (err error) {
	if err := c.Control(func(fd uintptr) {
		err = syscall.SetsockoptInt(syscall.Handle(fd), syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
	}); err != nil {
		return err
	}
	return
}