Mob Spawner v2

args = {...}
arg = args[1]
print("Waiting For Start....")

    local signal = true
    local x = 1
    local xStop = 24
    local timeBetweenStops = 20
if arg == "test" then
    timeBetweenStops = 0
    print("Testing Will Use Fuel Inefficiently")
end

local modem = peripheral.wrap("left")
modem.open(42)
local event, modemSide, senderChannel, replyChannel, message, senderDistance = os.pullEvent("modem_message")


function refuelTurtle(a)
    if turtle.getFuelLevel() > 1000 then
        return
    end
    if a == true then
        turtle.turnRight()
        turtle.turnRight()
        print("Starting Program")
    end

    local success, data = turtle.inspect()

    if data.name == "minecraft:chest" then
        print("Chest in Front")
        turtle.suck(64)
        if turtle.refuel(64) then
                print("Refueled")
                print(turtle.getFuelLevel())
        else
            while not turtle.refuel(64) do
                print("waiting for fuel")
                turtle.suck(64)
            end
        end
    else
        print("Chest isUp")
        turtle.suckUp(64)
        if turtle.refuel(64) then
                print("Refueled")
                print(turtle.getFuelLevel())
        else
            while not turtle.refuel(64) do
                print("waiting for fuel")
                turtle.suck(64)
            end
        end
    end
    if a == true then
        turtle.turnRight()
        turtle.turnRight()
    end
end
function main()
    local directionFromHome = "AWAY"
    while signal do
        directionFromHome = "AWAY"
        while x <= xStop do
            if turtle.forward() == true then
                x = x + 1
            end
        end

        turtle.turnRight()
        turtle.turnRight()
        directionFromHome = "TOWARDS"

        while x > 1 do
            if turtle.forward() == true then
                x = x - 1
            end
        end
        if turtle.getFuelLevel() <= 500 then
            refuelTurtle(false)
        end

        os.sleep(timeBetweenStops)
        turtle.turnRight()
        turtle.turnRight()
        directionFromHome = "AWAY"
        print("FUEL REMAINING: ", turtle.getFuelLevel())
    end
    if directionFromHome == "AWAY" and x > 1 then
        turtle.turnRight()
        turtle.turnRight()
        while x > 1 do
            if turtle.forward() == true then
                x = x - 1
            end
        end
    else
        while x > 1 do
            if turtle.forward() == true then
                x = x - 1
            end
        end
    end
end

if message == "start" then
    refuelTurtle(true)
    print("Recieved Start Command")
    function receive()
        local event, modemSide, senderChannel, replyChannel, message, senderDistance = os.pullEvent("modem_message")
        if message == "stop" then
            print("Recieved Stop command")
            signal = false
        end
    end
    parallel.waitForAll(receive, main)
end