Enchanting Bookdance

resetTime   = 15
pistonRight = {0, 1,2,3, 7,8,9, 13,14,15}
pistonTop   = {0, 4,5,6, 10,11,12}
updateTime  = 0.5

leftPressurePlate ="bottom"
rightPressurePlate="left"
leftPressurePlateLast=false
runningTimer= 0
numberShelfs= 15


--Loop
while true do

--Check for update
    if (redstone.getAnalogInput(leftPressurePlate)>0) and (redstone.getAnalogInput(rightPressurePlate)>0) then
        os.sleep(0.1)
        runningTimer=0
        print("double pressed")
    elseif(leftPressurePlateLast==true) and (redstone.getAnalogInput(rightPressurePlate)>0) then
        numberShelfs=numberShelfs-1
        leftPressurePlateLast=false
        runningTimer=0
        print("right pressed")
    elseif (leftPressurePlateLast==false) and (redstone.getAnalogInput(leftPressurePlate)>0) then
        numberShelfs=numberShelfs-1
        leftPressurePlateLast=true
        runningTimer=0
        print("left pressed")
    elseif (redstone.getAnalogInput(leftPressurePlate)>0) or (redstone.getAnalogInput(rightPressurePlate)>0) then
        if (runningTimer==1000000) then
            runningTimer=0
            leftPressurePlateLast= not leftPressurePlateLast
        end
    else
        runningTimer=runningTimer+1
    end

--Processing
    if (numberShelfs<=0) then numberShelfs=15 end

    --Top
    pistonTopValue = numberShelfs-8
    if (pistonTopValue<1) then pistonTopValue=1 end

    --Right
    pistonRightValue = numberShelfs+1
    if (pistonRightValue>10) then pistonRightValue=10 end

    --Set Redstone
    redstone.setAnalogOutput("top",pistonTop[pistonTopValue])
    redstone.setAnalogOutput("right",pistonRight[pistonRightValue])

    print(numberShelfs)
    print(runningTimer)

--Reset timer
    if (runningTimer>resetTime/updateTime) then
        numberShelfs=15
    end
    if (runningTimer*updateTime>60) then
        runningTimer=1000000
        print("idle")
        os.sleep(5)
    else
        os.sleep(updateTime)
    end
end