package bakeoff

import (
	"os/exec"
	"strings"
)

// AsleepFromLogs reads the platform's own events for host in `carlos logs`
// output: the instance is asleep when its latest event is "stopping" or
// "exited", and awake after "woke". (The health column in `carlos
// instances list` lags by minutes, so it can't be trusted for this.)
func AsleepFromLogs(logs, host string) bool {
	asleep := false
	for _, line := range strings.Split(logs, "\n") {
		if !strings.Contains(line, "[platform] "+host+" ") {
			continue
		}
		switch {
		case strings.Contains(line, "instance woke"):
			asleep = false
		case strings.Contains(line, "instance stopping"), strings.Contains(line, "instance exited"):
			asleep = true
		}
	}
	return asleep
}

// IsAsleep asks the platform's log whether the instance at host is asleep.
func IsAsleep(app, host string) (bool, error) {
	out, err := exec.Command("carlos", "logs", "--account", "bfj", "--app", app).CombinedOutput()
	if err != nil {
		return false, err
	}
	return AsleepFromLogs(string(out), host), nil
}

// MeasureWake times the first request to a sleeping instance.
func MeasureWake(s *Session, path string) (float64, error) {
	return s.timeToFirstByte(path)
}