package compose

import "time"

// terminateWindowsProcess reports a reap failure only when the process has not exited within the
// final bound. taskkill and Process.Kill can both race with a child that has already been reaped.
func terminateWindowsProcess(
	done <-chan error,
	terminateTree func() error,
	terminateDirect func() error,
	bound time.Duration,
) error {
	if processReaped(done) {
		return nil
	}
	_ = terminateTree()
	if processReaped(done) {
		return nil
	}
	_ = terminateDirect()
	if processReaped(done) {
		return nil
	}
	timer := time.NewTimer(bound)
	defer timer.Stop()
	select {
	case <-done:
		return nil
	case <-timer.C:
		return ErrProcessReap
	}
}

func processReaped(done <-chan error) bool {
	select {
	case <-done:
		return true
	default:
		return false
	}
}