function login()
	while true do

		print("Welcome, press 1 to login, or press 2 to sign up.")
		local choice
		choice = io.read()

		if tonumber(choice) == 1 then

			user_list = {}
			check_table = {}
			file = io.open("user_saves/test.txt")
			while true do
				local pair = file:read()
				if pair == nil then
					break
				else
					username, password = pair:match("([^,]+),([^,]+)")
					user_list[username] = password
					check_table[username] = true
				end
			end

			print("Welcome! Please Enter Username: ")
			local username
			username = io.read()

			if check_table[username] then
				local password
				print("Password: ")
				password = io.read()

				if user_list[username] == password then

					local cash
					print("Withdraw: ")
					cash = io.read()
					Account:withdraw(cash)

					break
				else
					print("Password incorrect, try again...")
				end

			else
				print("Invalid username, try again...")
			end

		elseif tonumber(choice) == 2 then

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

			print("Enter Password: ")
			local password
			password = io.read()

			file = io.open("user_saves/test.txt", "a")
			file:write(username .. "," .. password, "\n")
			file:flush()

			Account:create(username)

		else
			print("Invalid choice entered, try again...")

		end
	end
end

Account = {}
Account.__index = Account

function Account:create(user)
	local acc = {}
	setmetatable(acc,Account)
	acc.balance = 1000
	acc.user = user
end

function Account:withdraw(amount)
	self.balance = self.balance - amount
	print("current balance: " .. acc.balance)
end

login()