PerimeterCheck smartapp

definition(
    name: "Perimeter Check",
    namespace: "dzelenka",
    author: "Chris Hanson",
    description: "Turn on a light when the perimeter is secure, and turn it off when the perimeter is broken.",
    category: "Safety & Security",
    iconUrl: "https://s3.amazonaws.com/smartapp-icons/Convenience/Cat-Convenience.png",
    iconX2Url: "https://s3.amazonaws.com/smartapp-icons/Convenience/Cat-Convenience@2x.png",
    iconX3Url: "https://s3.amazonaws.com/smartapp-icons/Convenience/Cat-Convenience@2x.png")

preferences {
	section ("Perimeter devices:") {
		input "contacts", "capability.contactSensor", title: "Which?", multiple: true
	}
	section ("Turn on light:") {
		input "perimeterSwitch", "capability.switch"
	}
}

def installed() {
	initialize()
}

def updated() {
	unsubscribe()
	initialize()
}

def initialize() {
	subscribe(contacts, "contact", contactsHandler)
}

def contactsHandler(evt) {
	log.debug "EV $evt.value"
	if (evt.value == "open") {
		perimeterSwitch.off()
	} else if ( ! anyOpen(contacts) ) {
		perimeterSwitch.on()
	}
}

def anyOpen(obj) {
	return obj.currentValue("contact").toString().contains("open")
}