########################################
#
# FLIGHT-RELATED FUNCTIONS
#
########################################
TARGET_ALTITUDE = 5.0
UAVSTATE = "TURNEDOFF"

function idle() {
    statef=idle
    UAVSTATE = "IDLE"
}

function takeoff() {
	UAVSTATE = "TAKEOFF"
	statef=takeoff
	#log("TakeOff: ", flight.status)
	#log("Relative position: ", position.altitude)
	
	if( flight.status == 2 and position.altitude >= TARGET_ALTITUDE-TARGET_ALTITUDE/20.0) {
		barrier_set(ROBOTS,idle,land)
		barrier_ready()
		#statef=hexagon
	}
	else {
		log("Altitude: ", TARGET_ALTITUDE)
		neighbors.broadcast("cmd", 22)
		uav_takeoff(TARGET_ALTITUDE)
	}
}

function land() {
	UAVSTATE = "LAND"
	statef=land
	#log("Land: ", flight.status)
	if(flight.status == 2 or flight.status == 3){
		neighbors.broadcast("cmd", 21)
		uav_land()
	}
	else {
		barrier_set(ROBOTS,idle,land)
		barrier_ready()
		timeW=0
		#barrier = nil
		#statef=idle
	}
}

function uavcmd() {
    if(flight.rc_cmd==22) {
		log("cmd 22")
		flight.rc_cmd=0
		statef = takeoff
		UAVSTATE = "TAKEOFF"		
		neighbors.broadcast("cmd", 22)
	} else if(flight.rc_cmd==21) {
		log("cmd 21")
		log("To land")
		flight.rc_cmd=0
		statef = land
		UAVSTATE = "LAND"
		neighbors.broadcast("cmd", 21)
	} else if(flight.rc_cmd==16) {
		flight.rc_cmd=0
		statef = idle
		#uav_goto()
		add_user_rb(10,rc_goto.latitude,rc_goto.longitude)
	} else if(flight.rc_cmd==400) {
		flight.rc_cmd=0
		uav_arm()
		neighbors.broadcast("cmd", 400)
	} else if (flight.rc_cmd==401){
		flight.rc_cmd=0
		uav_disarm()
		neighbors.broadcast("cmd", 401)
	}

    neighbors.listen("cmd",
    function(vid, value, rid) {
        print("Got (", vid, ",", value, ") from robot #", rid)
        if(value==22 and UAVSTATE!="TAKEOFF") {
            statef=takeoff
        } else if(value==21) {
            statef=land
        } else if(value==400 and UAVSTATE=="IDLE") {
            uav_arm()
        } else if(value==401 and UAVSTATE=="IDLE"){
            uav_disarm()
        }
    })
}