package endpoint

import (

	"fmt"
	"io"

	"golang.org/x/crypto/ssh"


	"net"
)

type Endpoint struct {
	Host string
	Port int
}

func (endpoint *Endpoint) String() string {
	return fmt.Sprintf("%s:%d", endpoint.Host, endpoint.Port)
}

type SSHtunnel struct {
	Local  *Endpoint
	Server *Endpoint
	Remote *Endpoint

	Config *ssh.ClientConfig
	ServerConnection *ssh.ServerConfig
}

// type localEndpoint []Endpoint
//
// type remoteEndpoint []Endpoint


//func (index *arrayFlags) Set

// var testend Endpoint
//
// testend.Host = "localhost"
// testend.Port = "5"

func (tunnel *SSHtunnel) Start() error {
  for {
    listener, err := net.Listen("tcp", tunnel.Local.String())
    if err != nil {
      return err
    }
    defer listener.Close()

    for {
      conn, err := listener.Accept()
      if err != nil {
        return err
      }
      go tunnel.forward(conn)
    }
}
  }


func (tunnel *SSHtunnel) forward(localConn net.Conn) {
	serverConn, err := ssh.Dial("tcp", tunnel.Server.String(), tunnel.Config)
	if err != nil {
		fmt.Printf("Server dial error: %s\n", err)
		return
	}

	remoteConn, err := serverConn.Dial("tcp", tunnel.Remote.String())
	if err != nil {
		fmt.Printf("Remote dial error: %s\n", err)
		return
	}

	copyConn:=func(writer, reader net.Conn) {
		_, err:= io.Copy(writer, reader)
		if err != nil {
			fmt.Printf("io.Copy error: %s", err)
		}
	}

	go copyConn(localConn, remoteConn)
	go copyConn(remoteConn, localConn)
}