CC Tweaked Banking Client App - banking_public2

local Username = "guest"
local BankScript = "os/System/Programs/BankingSystem-banking_public2"
local BankFile = "os/System/Files/.Banking"

local function Clear()
term.clear()
term.setCursorPos(1,1)
end

function CUI(m) --declare function
n=1
local l = #m
while true do
term.setCursorPos(1,5)
for i=1, #m, 1 do --traverse the table of options
if i==n then term.clearLine() print(i, ">",m[i]) else term.clearLine() print(i, "-", m[i]) end --print them
end
a, b= os.pullEvent("key") --wait for keypress
if b==keys.w and n>1 then n=n-1 end
if b==keys.s and n<l then n=n+1 end
if b==keys.enter then break end
end
return n --return the value
end

function TransferScreen()
Clear()
print("please choose action")
local options = {"send","exit"}
local n = CUI(options)
if options[n] == "exit" then
    Menu()
elseif options[n] == "send" then
    Clear()
    print("enter Amount")
    local input
    while true do
        local event = {os.pullEvent("key")}
        if event[2] == keys.enter then break end
        input = read()
    end
    local Amount = input
    Clear()
    print("enter Target")
    while true do
        local event = {os.pullEvent("key")}
        if event[2] == keys.enter then break end
        input = read()
    end
    shell.run(BankScript,"Transfer", Amount,input)
    os.sleep(2)
    TransferScreen()
end
end

function Menu()
Clear()
print("hello ",Username)
local options = {"Details","Transfer","exit"}
local n = CUI(options)
if options[n] == "exit" then

elseif options[n] == "Transfer" then
    TransferScreen()
elseif options[n] == "Details" then
    Clear()
    print("press enter to exit")
    shell.run(BankScript,"details")
    repeat
        local event, key = os.pullEvent("key")
    until key == keys.enter
    Menu()
end
end

function FirstStart()
Clear()
print("hello! And welcome to Imperial Banking Net")
local options = {"Login","create account","exit"}
local n = CUI(options)
if options[n] == "Login" then
    LoginScreen()
elseif options[n] == "create account" then
    CreateAccount()
elseif options[n] == "exit" then

end
end

function LoginScreen()
Clear()
print("please enter Username")
local input
while true do
    local event = {os.pullEvent("key")}
    if event[2] == keys.enter then break end
    input = read()
end
shell.run(BankScript,"Login",input)
if fs.exists(BankFile) then
    Menu()
else
    FirstStart()
end
end

function CreateAccount()
Clear()
print("please enter username")
local input
while true do
    local event = {os.pullEvent("key")}
    if event[2] == keys.enter then break end
    input = read()
end
print("contacting servers")
shell.run(BankScript,"CreateAccount")
if fs.exists(BankFile) then
    Menu()
else
    FirstStart()
end
end

if fs.exists(BankFile) then
    Menu()
else
    FirstStart()
end