Passcode Monitor

os.loadAPI("btn")
mon = peripheral.wrap("top")
rednet.open("right")

local serverID = 121
local curPass = ""
local pass
local passLength = 0

local id
local msg

local event
local button
local x
local y

function addNumber(number)
    if passLength+1 <= 10 then
        passLength = passLength+1
        curPass = curPass..number
    end
end

function delNumber()
    if passLength-1 >= 0 then
        passLength = passLength-1
        curPass = string.sub(curPass, -#curPass, #curPass-1)
    end
end

function blank()

end

local function mainScreen()
    mon.setTextScale(1)
    local yPos = 5
    mon.setBackgroundColor(colors.lightGray)
    mon.clear()
    mon.setCursorPos(1,1)
    btn.createScreen()

    mon.setBackgroundColor(colors.gray)

    for i = 1,5 do
        mon.setCursorPos(24,yPos)
        for i = 24,47 do
            mon.write(" ")
        end
        yPos = yPos+1
    end

    mon.setCursorPos(25, 7)
    mon.setBackgroundColor(colors.black)
    for i = 25,46 do
        mon.write(" ")
    end

    mon.setCursorPos(27,7)

    for i = 1,passLength do
        mon.write("*")
    end
end

function checkPass()
    rednet.send(serverID, curPass)
    curPass = ""
    passLength = 0
    mainScreen()
    id, msg, dis = rednet.receive(10)
    if id == serverID and msg == "Correct" then
        print("Correct")
        mon.clear()
        mon.setTextScale(4)
        btn.centerText(3,"Dont Move!!",colors.white)
        sleep(.5)
        mon.clear()
        btn.centerText(3,"Dont Move!!",colors.white)
        sleep(.5)
        rs.setOutput("left",true)
        sleep(1)
        rs.setOutput("right",true)
        sleep(2)
        rs.setOutput("right",false)
        sleep(1)
        rs.setOutput("left",false)
    else
        print("Incorrect")
    end
end

btn.fillTable("1",4,8,2,6,"1",addNumber,colors.green,true)
btn.fillTable("2",10,14,2,6,"2",addNumber,colors.green,true)
btn.fillTable("3",16,20,2,6,"3",addNumber,colors.green,true)
btn.fillTable("4",4,8,8,12,"4",addNumber,colors.green,true)
btn.fillTable("5",10,14,8,12,"5",addNumber,colors.green,true)
btn.fillTable("6",16,20,8,12,"6",addNumber,colors.green,true)
btn.fillTable("7",4,8,14,18,"7",addNumber,colors.green,true)
btn.fillTable("8",10,14,14,18,"8",addNumber,colors.green,true)
btn.fillTable("9",16,20,14,18,"9",addNumber,colors.green,true)
btn.fillTable("0",10,14,20,24,"0",addNumber,colors.green,true)
btn.fillTable("blank1",4,8,20,24," ",blank,colors.green,true)
btn.fillTable("blank2",16,20,20,24," ",blank,colors.green,true)
btn.fillTable("enter",24,47,11,15,"Enter",checkPass,colors.lime,true)
btn.fillTable("delete",24,47,17,21,"Delete ",delNumber,colors.red,true)

while true do
    mainScreen()
    event, button, x, y = os.pullEvent("monitor_touch")
    btn.checkClick(x,y)
end