redstone.setBundledOutput("right",0) -- Reset all bundled cables to off state
player= peripheral.wrap("left")

local safestate=0

-- Function to perform when the door is set to unlock state
function dlock_off()
    safestate=1
end

-- Function to perform when the door is set to lock state
function dlock_on()
    safestate=0
end

function pushBook()
    peripheral.call("bottom","pushItem","up",1,1)
end
function pullBook()
    peripheral.call("bottom","pullItem","up",1,1,1)
end

while true do
    if (colors.test(redstone.getBundledInput("right"),colors.white)) then
        dlock_off()
    end
    if (colors.test(redstone.getBundledInput("right"),colors.black)) then
        dlock_on()
    end
    if (safestate==1) then pushBook() else
        if (safestate==0 and table.getn(player.getNearbyPlayers(7))>0) then
            pullBook()
        else
            pushBook()
        end
    end
    redstone.setAnalogOutput("front",safestate)
    sleep(1)
end