local username = "admin"
local password = "bob"

local username2 = "gav"
local password2 = "0443"

rednet.open("top")

local function center(str, width)
    local blank = string.rep(' ',math.floor((width-#str)/2))
    return blank .. str
end

function logonscreen()
    local pass = ""
    local user = ""
    term.clear()
    local w,h = term.getSize()
    term.setCursorPos(1,5)
    print(center("+---------------------+",w))
    print(center("|      End Tower      |",w))
    print(center("|        Login        |",w))
    print(center("+---------------------+",w))
    print(center("|         +----------+|",w))
    print(center("|Username:|          ||",w))
    print(center("|         +----------+|",w))
    print(center("|Password:|          ||",w))
    print(center("|         +----------+|",w))
    print(center("+---------------------+",w))
    term.setCursorPos(25,10)
    term.setCursorBlink(true)
    usern = true
    x = 0
while usern == true do
local sEvent, param = os.pullEventRaw()
        if sEvent == "char" then
            if string.len(user) + 1 <= 9 then
                user = user..param
                write(param)
                x = x + 1
            end
        elseif sEvent == "key" then
            if param == 28 then
                usern = false
            elseif param == 14 then
                if x ~= 0 then
                    x = x - 1
                    term.setCursorPos(25 + x,10)
                    write(" ")
                    term.setCursorPos(25 + x,10)
                    user = string.sub(user, 1, -2)
                end
            end
        elseif sEvent == "terminate" then
         write("")
     elseif sEvent == "disk" then
   disk.eject(param)
    end

end


term.setCursorPos(25,12)
passw = true
x = 0
while passw == true do
local sEvent, param = os.pullEventRaw()
        if sEvent == "char" then
            if string.len(pass) + 1 <= 9 then
                pass = pass..param
                write("*")
                x = x + 1
            end
        elseif sEvent == "key" then
            if param == 28 then
                if pass == password and user == username then
                    term.clear()
                    term.setCursorPos(1,1)
                    print("Username and Password Accepted")
                    passw = false
                    shell.run("menu")
     elseif pass == password2 and user == username2 then
      print("Username and Password Accepted")
      passw = false
      shell.run("menu")
                else
                    os.reboot()
                end
            elseif param == 14 then
                if x ~= 0 then
                    x = x - 1
                    term.setCursorPos(25 + x,12)
                    write(" ")
                    term.setCursorPos(25 + x,12)
                    pass = string.sub(pass, 1, -2)
                end
            end
        elseif sEvent == "terminate" then
            write("")
  elseif sEvent == "disk" then
  disk.eject(param)
        end
end
end
logonscreen()