//go:build darwin || dragonfly || freebsd || linux || netbsd || openbsd

package machine

import (
	"errors"
	"fmt"
	"syscall"

	psutil "github.com/shirou/gopsutil/v3/process"
	"github.com/sirupsen/logrus"
)

// / waitOnProcess takes a pid and sends a sigterm to it. it then waits for the
// process to not exist.  if the sigterm does not end the process after an interval,
// then sigkill is sent.  it also waits for the process to exit after the sigkill too.
func waitOnProcess(processID int) error {
	logrus.Infof("Going to stop gvproxy (PID %d)", processID)

	p, err := psutil.NewProcess(int32(processID))
	if err != nil {
		return fmt.Errorf("looking up PID %d: %w", processID, err)
	}

	running, err := p.IsRunning()
	if err != nil {
		return fmt.Errorf("checking if gvproxy is running: %w", err)
	}
	if !running {
		return nil
	}

	if err := p.Kill(); err != nil {
		if errors.Is(err, syscall.ESRCH) {
			logrus.Debugf("Gvproxy already dead, exiting cleanly")
			return nil
		}
		return err
	}
	return backoffForProcess(p)
}