package daemon

import (
	"errors"
	"fmt"
	"os"
	"runtime"
	"syscall"
	"time"

	"github.com/gravitl/netmaker/netclient/ncutils"
)

// InstallDaemon - Calls the correct function to install the netclient as a daemon service on the given operating system.
func InstallDaemon() error {

	os := runtime.GOOS
	var err error

	switch os {
	case "windows":
		err = SetupWindowsDaemon()
	case "darwin":
		err = SetupMacDaemon()
	case "linux":
		err = SetupSystemDDaemon()
	case "freebsd":
		err = SetupFreebsdDaemon()
	default:
		err = errors.New("this os is not yet supported for daemon mode. Run join cmd with flag '--daemon off'")
	}
	return err
}

// Restart - restarts a system daemon
func Restart() error {
	if ncutils.IsWindows() {
		RestartWindowsDaemon()
		return nil
	}
	pid, err := ncutils.ReadPID()
	if err != nil {
		return fmt.Errorf("failed to find pid %w", err)
	}
	p, err := os.FindProcess(pid)
	if err != nil {
		return fmt.Errorf("failed to find running process for pid %d -- %w", pid, err)
	}
	if err := p.Signal(syscall.SIGHUP); err != nil {
		return fmt.Errorf("SIGHUP failed -- %w", err)
	}
	return nil
}

// Start - starts system daemon
func Start() error {
	os := runtime.GOOS
	var err error
	switch os {
	case "windows":
		RestartWindowsDaemon()
	case "darwin":
		RestartLaunchD()
	case "linux":
		RestartSystemD()
	case "freebsd":
		FreebsdDaemon("restart")
	default:
		err = errors.New("this os is not yet supported for daemon mode. Run join cmd with flag '--daemon off'")
	}
	return err
}

// Stop - stops a system daemon
func Stop() error {
	os := runtime.GOOS
	var err error

	time.Sleep(time.Second)

	switch os {
	case "windows":
		RunWinSWCMD("stop")
	case "darwin":
		StopLaunchD()
	case "linux":
		StopSystemD()
	case "freebsd":
		FreebsdDaemon("stop")
	default:
		err = errors.New("no OS daemon to stop")
	}
	return err
}