package vpn

import (
	"io/ioutil"
	"os"
	"time"

	"github.com/davegallant/vpngate/pkg/exec"
	"github.com/davegallant/vpngate/pkg/network"
	"github.com/juju/errors"
	"github.com/nxadm/tail"
	"github.com/rs/zerolog/log"
)

// Connect to a specified OpenVPN configuration
func Connect(configPath string) error {

	tmpLogFile, err := ioutil.TempFile("", "vpngate-openvpn-log-")
	if err != nil {
		return errors.Annotate(err, "Unable to create a temporary log file")
	}
	defer os.Remove(tmpLogFile.Name())

	go func() {
		for {
			err = network.TestSpeed()
			if err != nil {
				log.Error().Msg("Failed to test network speed")
			}
			time.Sleep(time.Minute)
		}

	}()

	go func() {
		// Tail the temporary openvpn log file
		t, err := tail.TailFile(tmpLogFile.Name(), tail.Config{Follow: true})
		if err != nil {
			log.Error().Msgf("%s", err)
		}
		for line := range t.Lines {
			log.Debug().Msg(line.Text)
		}
	}()

	_, err = exec.Run("openvpn", ".", "--verb", "4", "--log", tmpLogFile.Name(), "--config", configPath)
	return err
}