Power Alert

definition(
    name: "Power Alert",
    namespace: "public",
    author: "SmartThings and B Ravenel",
    description: "Notify if power exceeds a threshold",
    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",
    iconX3Url: "https://s3.amazonaws.com/smartapp-icons/Convenience/Cat-Convenience@2x.png")


preferences {
	section ("Power Alert") {
		input(name: "meter", type: "capability.powerMeter", title: "When This Power Meter...", required: true, multiple: false, description: null)
		input(name: "threshold", type: "number", title: "Reports Above...", required: true, description: "in either watts or kw.")
	}
    
	section("Text me at (optional, sends a push notification if not specified)...") {
		input "phone", "phone", title: "Phone number?", required: false
	}
}

def installed() { 
	initialize()
}

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

def initialize() {
	subscribe(meter, "power", meterHandler)
	state.notNotified = true
}

// notifies on first incursion above threshold, but not again until power falls below threshold and then rises again

def meterHandler(evt) {
	def meterValue = evt.value as double
	def thresholdValue = threshold as int
	if(meterValue > thresholdValue) {
		if(state.notNotified) {
			def msg = "Power on $evt.displayName is $meterValue"
			if(phone) sendSms(phone, msg) else sendNotification(msg)
			state.notNotified = false
		}
	} else state.notNotified = true
}