NightlightWhenAway.groovy

/**
 *  Turn on a switch when in Away mode and it's night
 *
 *  Author: Steve Sell steve.sell@gmail.com
 */
preferences {
    section("Turn on..."){
    	input "switches", "capability.switch", multiple: true, required: true
    }
}

def installed() {
	log.debug "Installed with settings: ${settings}"
	initialize()
}

def updated(settings) {
	log.debug "Updated with settings: ${settings}"
	unsubscribe()
	unschedule("turn_off")
    	unschedule("turn_on")
	initialize()
}

def initialize()
{
    subscribe(location, modeChangeHandler)
}

def modeChangeHandler(evt) {
	def sunRiseAndSunset = getSunriseAndSunset()
    def timenow = now() 
    def sunrise_time = sunRiseAndSunset.sunrise.time
    def sunset_time = sunRiseAndSunset.sunset.time
    def isNight = false
    
    if (timenow > sunset_time  || timenow < sunrise_time) {
    	log.debug "$timenow is not between sunrise: $sunrise_time and sunset: $sunset_time"
    	isNight = true
    }
    
	if (evt.value == "Away")
    {
    	if (isNight) // It's night already
        {
        	turn_on()  // Turn on the lights
        }
        else // It's not night yet, just schedule the lights to come on at sunset
        {
        	unschedule("turn_on")
        	runOnce(sunset_time, "turn_on")
        }
    }
	else // We changed to another mode other than "Away" so unschedule everything
    {
		unschedule("turn_off")
        unschedule("turn_on")
    }
}


def turn_off() {
	// Turn off the switches and schedule them to come on at sunset
	def sunRiseAndSunset = getSunriseAndSunset()
	switches?.off()
    	unschedule("turn_on")
    	runOnce(sunRiseAndSunset.sunset.time, "turn_on")
}

def turn_on() {
	// Turn on the switches and schedule them to turn off at sunset
	def sunRiseAndSunset = getSunriseAndSunset()
	switches?.on()
    	unschedule("turn_off")
    	runOnce(sunRiseAndSunset.sunrise.time, "turn_off")
}