Computer Craft - ATM

local adminPass = "ENTER_PASSWORD_HERE"
local currencyName = "CURRENCY_NAME"

-- Function splitString writen by user973713 on stackoverflow.com
function splitString(inputstr, sep)
        if sep == nil then
                sep = "%s"
        end
        local t={} ; i=1
        for str in string.gmatch(inputstr, "([^"..sep.."]+)") do
                t[i] = str
                i = i + 1
        end
        return t
end

function login(username)
        shell.run("clear")
        print("Welcome to the bank " .. username .. ".")

        local file = fs.open(username, "r")
        local dataRaw = file.readLine()
        local data = splitString(dataRaw, " ")
        local money = data[2]

        print("Your current account balance is " .. money .. " " .. currencyName .. "(s).")

        local command;
        repeat
            term.write(">")
            command = read()

            if(command == "transfer") then
                print("Enter account name to continue:")
                local transferAccount = read()
                local transferAccountFile = fs.open(transferAccount, "r")
                if(transferAccountFile == nil) then
                    print("Specified user does not exist.")
                else
                    local transferAccountDataRaw = transferAccountFile.readLine()
                    local transferAccountData = splitString(transferAccountDataRaw, " ")

                    if(transferAccountFile == nil) then
                        print("No account exists with this account name.")
                    else
                        print("How much money would you like to transfer?")
                        local transferAmmount = tonumber(read())
                        if(transferAmmount == nil) then
                            print("That is not a valid amount.")
                        else
                            local accountFile = fs.open(username, "r")
                            local accountDataRaw = accountFile.readLine()
                            local accountData = splitString(accountDataRaw, " ")
                            local accountMoney = tonumber(data[2])
                            if(transferAmmount < 0) then
                                print("You can not transfer a negative amount of money.")
                            else
                                if(transferAmmount > accountMoney) then
                                    print("You do not have enough money to complete this transfer.")
                                else
                                    print("Transfering money...")
                                    local newFile = fs.open(username, "w")
                                    newFile.writeLine(accountData[1] .. " " .. (accountData[2] - transferAmmount))
                                    local newTransferAccountFile = fs.open(transferAccount, "w")
                                    newTransferAccountFile.writeLine(transferAccountData[1] .. " " .. (transferAccountData[2] + transferAmmount))
                                    newFile.close()
                                    newTransferAccountFile.close()
                                    print("Transfer complete.")
                                end
                            end
                        end
                    end
                end
            elseif(command == "balance") then
                local file = fs.open(username, "r")
                local dataRaw = file.readLine()
                local data = splitString(dataRaw, " ")
                local money = data[2]
                print("You have " .. money .. " " .. currencyName .. "(s).")
            elseif(command == "help") then
                print("Type 'balance' for your balance, 'transfer' to transfer funds, and 'logout' to logout.")
            elseif(command == 'logout') then
            else
                print("Unknown command.")
            end

        until command == "logout"

        file.close();
        print("Goodbye.")
        sleep(1)
        os.reboot()

end

os.pullEvent = os.pullEventRaw

shell.run("clear")

print("Enter Username: ")
local username = read()

print("Enter Password: ")
local password = read("*")

local dataFile = fs.open(username, "r")

if(dataFile == nil) then
        print("No such user exists...")
        sleep(1)
        os.reboot()
end


local dataRaw = dataFile.readLine()

local data = splitString(dataRaw, " ")
local dataPassword = data[1]

if(password == dataPassword) then
    print("Login credentials correct...")
        sleep(1)
        login(username)
elseif(password == adminPass) then
    print("Program ended.")
else
    print("Login credentials incorrect.")
        sleep(1)
    os.reboot()
end