Lights on Arrival

/**
 *  Lights on Arrival
 *
 *  Copyright 2014 Alex Malikov
 *
 *  Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 *  in compliance with the License. You may obtain a copy of the License at:
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software distributed under the License is distributed
 *  on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License
 *  for the specific language governing permissions and limitations under the License.
 *
 */
definition(
    name: "Lights on Arrival",
    namespace: "625alex",
    author: "Alex Malikov",
    description: "Turn lights on when arriving if it's dark outside",
    category: "Convenience",
    iconUrl: "https://s3.amazonaws.com/smartapp-icons/Convenience/Cat-Convenience.png",
    iconX2Url: "https://s3.amazonaws.com/smartapp-icons/Convenience/Cat-Convenience@2x.png")


preferences {
	section("When one of these persons arrives") {
		input "people", "capability.presenceSensor", multiple: true
	}
    section("And it's dark...") {
		input "luminance", "capability.illuminanceMeasurement", title: "Where?"
	}
	section("Then flash..."){
		input "switches", "capability.switch", title: "These lights", multiple: true
		input "numFlashes", "number", title: "This number of times (default 3)", required: false
	}
	section("Time settings in milliseconds (optional)..."){
		input "onFor", "number", title: "On for (default 1000)", required: false
		input "offFor", "number", title: "Off for (default 1000)", required: false
	}
}

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

	subscribe()
}

def updated() {
	log.debug "Updated with settings: ${settings}"

	unsubscribe()
	subscribe()
}

def initialize() {
	subscribe(people, "presence", presenseHandler)
}

def presenceHandler(evt) {
	log.debug "presence $evt.value"
	   if (evt.value == "present") {
	def lightSensorState = luminance.currentIlluminance
           log.debug "SENSOR = $lightSensorState"
        if (lightSensorState && lightSensorState < 20) {
	   log.trace "light.on() ... [luminance: ${lightSensorState}]"
	       } else if (evt.value == "not present") {
		flashLights()
	}
	else if (evt.value == "not present") {
	   flashLights()
}
}
}
private flashLights() {
	def doFlash = true
	def onFor = onFor ?: 600000
	def offFor = offFor ?: 0
	def numFlashes = numFlashes ?: 1

	log.debug "LAST ACTIVATED IS: ${state.lastActivated}"
	if (state.lastActivated) {
		def elapsed = now() - state.lastActivated
		def sequenceTime = (numFlashes + 1) * (onFor + offFor)
		doFlash = elapsed > sequenceTime
		log.debug "DO FLASH: $doFlash, ELAPSED: $elapsed, LAST ACTIVATED: ${state.lastActivated}"
	}

	if (doFlash) {
		log.debug "FLASHING $numFlashes times"
		state.lastActivated = now()
		log.debug "LAST ACTIVATED SET TO: ${state.lastActivated}"
		def initialActionOn = switches.collect{it.currentSwitch != "on"}
		def delay = 1L
		numFlashes.times {
			log.trace "Switch on after  $delay msec"
			switches.eachWithIndex {s, i ->
				if (initialActionOn[i]) {
					s.on(delay: delay)
				}
				else {
					s.off(delay:delay)
				}
			}
			delay += onFor
			log.trace "Switch off after $delay msec"
			switches.eachWithIndex {s, i ->
				if (initialActionOn[i]) {
					s.off(delay: delay)
				}
				else {
					s.on(delay:delay)
				}
			}
			delay += offFor
		}
}
}