// Package client exposes an obfsvpn client that launches a local socks5 proxy,
// with optional kcp wire transport.

package client

import (
	"fmt"
	"log"
	"net"

	"0xacab.org/leap/obfsvpn"

	"github.com/kalikaneko/socks5"
	"github.com/xtaci/kcp-go"
)

type Client struct {
	kcp       bool
	socksAddr string
	obfs4Cert string
	server 	  *socks5.Server
}

func NewClient(kcp bool, socksAddr, obfs4Cert string) *Client {
	return &Client{
		kcp:       kcp,
		socksAddr: socksAddr,
		obfs4Cert: obfs4Cert,
	}
}

func (c *Client) Start() bool {
	if c.server != nil {
		log.Printf("Cannot start proxy server if already initialzied")
		return false
	}

	c.server = &socks5.Server{
		Addr:   c.socksAddr,
		BindIP: "127.0.0.1",
	}

	dialer, err := obfsvpn.NewDialerFromCert(c.obfs4Cert)
	if err != nil {
		log.Printf("Error getting dialer: %v\n", err)
		return false
	}

	if c.kcp {
		dialer.DialFunc = func(network, address string) (net.Conn, error) {
			log.Printf("Dialing kcp://%s\n", address)
			return kcp.Dial(address)
		}
	}

	c.server.Dial = dialer.Dial

	fmt.Printf("[+] Starting socks5 proxy at %s\n", c.socksAddr)
	if err := c.server.ListenAndServe(); err != nil {
		log.Printf("error while listening: %v\n", err)
		c.server = nil
		return false
	}
	return true
}


func (c *Client) Stop() bool {
	if c.server == nil {
		return false
	}
	defer  func() {
		c.server = nil
	}()

	if err := c.server.Close(); err != nil {
		log.Printf("error while stopping: %v\n", err)
		return false
	}
	return true
}