func motionToSlack(api *slack.Client, my_name string, channel string, image string, count int) {
	_, err := http.Get(image)
	chk(err)

	params := slack.NewPostMessageParameters()
	params.Username = my_name
	params.IconEmoji = ":rotating_light:"
	attachment := slack.Attachment{}
	attachment.Color = "#ff0000"
	attachment.Title = "Motion detected"
	attachment.Text = fmt.Sprintf("Motion events detected: %d", count)
	attachment.ImageURL = image
	params.Attachments = []slack.Attachment{attachment}
	api.PostMessage(channel, "", params)
}
func lightsToSlack(api *slack.Client, my_name string, channel string, image string, level int) {
	_, err := http.Get(image)
	chk(err)

	params := slack.NewPostMessageParameters()
	params.Username = my_name
	params.IconEmoji = ":bulb:"
	attachment := slack.Attachment{}
	attachment.Color = "#00ff00"
	attachment.Title = "Lights detected"
	attachment.Text = fmt.Sprintf("Light level detected: %d", level)
	attachment.ImageURL = image
	params.Attachments = []slack.Attachment{attachment}
	api.PostMessage(channel, "", params)
}
// createMessage generates the message to post to Slack.
func createMessage(p Plugin, user *slack.User) slack.PostMessageParameters {
	var messageOptions MessageOptions
	var color string
	var messageTitle string

	// Determine if the build was a success
	if p.Build.Status == "success" {
		messageOptions = p.Config.Success
		color = "good"
		messageTitle = "Build succeeded"
	} else {
		messageOptions = p.Config.Failure
		color = "danger"
		messageTitle = "Build failed"
	}

	// setup the message
	messageParams := slack.PostMessageParameters{
		Username: messageOptions.Username,
	}

	if strings.HasPrefix(messageOptions.Icon, "http") {
		log.Info("Icon is a URL")
		messageParams.IconURL = messageOptions.Icon
	} else {
		log.Info("Icon is an emoji")
		messageParams.IconEmoji = messageOptions.Icon
	}

	// setup the payload
	payload := templatePayload{
		Build:     p.Build,
		Repo:      p.Repo,
		BuildLast: p.BuildLast,
		User:      user,
	}

	messageText, err := template.Render(messageOptions.Template, &payload)

	if err != nil {
		log.Error("Could not parse template")
	}

	// create the attachment
	attachment := slack.Attachment{
		Color:     color,
		Text:      messageText,
		Title:     messageTitle,
		TitleLink: p.Build.Link,
	}

	// Add image if any are provided
	imageCount := len(messageOptions.ImageAttachments)

	if imageCount > 0 {
		log.WithFields(log.Fields{
			"count": imageCount,
		}).Info("Choosing from images")
		rand.Seed(time.Now().UTC().UnixNano())
		attachment.ImageURL = messageOptions.ImageAttachments[rand.Intn(imageCount)]
	}

	messageParams.Attachments = []slack.Attachment{attachment}

	return messageParams
}