Computercraft coffe machine

rednet.open("back")

-- Username
local ufile = fs.open("disk/user.lua","r")
local username = ufile.readLine()
ufile.close()

-- Money Read
local mrfile = fs.open("disk/money.lua","r")
local money = mrfile.readLine()
mrfile.close()

-- Coffe Read
local cffile = fs.open("disk/coffe.lua","r")
local cff = cffile.readLine()
cffile.close()

--[[ Local Variables ]]--
local selectedItem = 1
local inMainMenu = true
local insubMenu = false

-- Menu Methods --
-- Deposit Start

local function insufficientFunds(current, required)
    if current < required then
        print("You don't have enough money")
        sleep(2)
        disk.eject("right")
        os.reboot() -- the reboot will negate the need to return a value.
        -- I still recommend removing the reboots for this program.
    end
    return false -- you have sufficient funds
end

if money > 5 then
    print("You don't have enougth money")
    make()
    sleep(2)
    disk.eject("right")
    os.reboot()
end

function line()
    term.clear()
    term.setCursorPos(1,1)
    term.write(string.rep("-", 51)) -- Repeat string x amount of times
    term.setCursorPos(1,19)
    term.write(string.rep("-", 51))
end

function sugar()
  if tonumber(money) < 5 then
  print("You don't have enougth money")
  make()
  sleep(2)
  disk.eject("right")
  os.reboot()
  else

  m = money - 5
  local wfile = fs.open("disk/money.lua","w")
  wfile.write(m)
  wfile.close()

  c = cff - 1
  local cffile = fs.open("disk/coffe.lua","w")
  cffile.write(c)
  cffile.close()

  rednet.broadcast("sugar","cof1")
  os.reboot()
  end
end

function blaze()
 if tonumber(money) < 10 then
 print("You don't have enougth money")
 make()
 sleep(2)
 disk.eject("right")
 os.reboot()
 else
 m = money - 10
 local wfile = fs.open("disk/money.lua","w")
 wfile.write(m)
 wfile.close()

 c = cff - 1
 local cffile = fs.open("disk/coffe.lua","w")
 cffile.write(c)
 cffile.close()

 rednet.broadcast("blaze","cof1")
 os.reboot()
 end
end

function cream()
 if tonumber(money) < 10 then
 print("You don't have enougth money")
 make()
 sleep(2)
 disk.eject("right")
 os.reboot()
 else
 m = money - 10
 local wfile = fs.open("disk/money.lua","w")
 wfile.write(m)
 wfile.close()

 c = cff - 1
 local cffile = fs.open("disk/coffe.lua","w")
 cffile.write(c)
 cffile.close()

 rednet.broadcast("cream","cof1")
 os.reboot()
 end
end

function golden()
 if tonumber(money) < 25 then
 print("You don't have enougth money")
 make()
 sleep(2)
 disk.eject("right")
 os.reboot()
 else
 m = money - 25
 local wfile = fs.open("disk/money.lua","w")
 wfile.write(m)
 wfile.close()

 c = cff - 1
 local cffile = fs.open("disk/coffe.lua","w")
 cffile.write(c)
 cffile.close()

 rednet.broadcast("golden","cof1")
 os.reboot()
 end
end

function tear()
  if tonumber(money) < 30 then
  print("You don't have enougth money")
  make()
  sleep(2)
  disk.eject("right")
  os.reboot()
  else
  m = money - 30
  local wfile = fs.open("disk/money.lua","w")
  wfile.write(m)
  wfile.close()

  c = cff - 1
  local cffile = fs.open("disk/coffe.lua","w")
  cffile.write(c)
  cffile.close()

  rednet.broadcast("tear","cof1")
  os.reboot()
  end
end


function Exit()
  inMainMenu = false
  disk.eject("right")
  os.reboot()
end


function make()
 rednet.broadcast("make","cof1")
 if redstone.getInput("bottom") == true then
  c = 6
  local cffile = fs.open("disk/coffe.lua","w")
  cffile.write(c)
  cffile.close()
  disk.eject("right")
  os.reboot()
  else
  term.clear()
  term.setCursorPos(1,1)
  term.write("---------------------------------------------------")
  term.setCursorPos(1,19)
  term.write("---------------------------------------------------")
  term.setCursorPos(15,9)
  print("Brewing Coffe")
  term.setCursorPos(15,10)
  sleep(3)
  make()
 end
end

if tonumber(cff) == 0 then
  make()
end

-- Menu Definitions--
 mainMenu = {
 [1] = {text = "Extra Sugar = 5$ (You can only use in the max 1)", handler = sugar},
 [2] = {text = "Strong = 10$ (You can only use in the max 1)", handler = blaze},
 [3] = {text = "Cream = 10$ (You can only use in the max 1)", handler = cream},
 [4] = {text = "Premium = 25$ (You can only use in the max 1)", handler = golden},
 [5] = {text = "Healthy = 30$ (You can only use in the max 1)", handler = tear},
 [6] = {text = "Make Coffe", handler = make},
 [7] = {text = "Cancel", handler = Exit},
 }

 -- Printing Methods --
 function printMenu( menu )
  for i=1,#menu do
   if i == selectedItem then
    print(">> "..menu[i].text)
   else
    print("   "..menu[i].text)
   end
 end
end

 -- Handler Method --
function onKeyPressed( key, menu)
  if key == keys.enter then
     onItemSelected(menu)
  elseif key == keys.up then
     if selectedItem > 1 then
     selectedItem = selectedItem - 1
     end
  elseif key == keys.down then
     if selectedItem < #menu then
     selectedItem = selectedItem + 1
   end
  end
 end

function onItemSelected(menu)
  menu[selectedItem].handler()
end

while inMainMenu do
  line()
  term.setCursorPos(1,2)
  print("Username: "..username)
  print("Current Money: "..money.. " Euros")
  print("Number of ingredients remaining: "..cff)
  term.setCursorPos(1,6)
  printMenu(mainMenu)
   event, key = os.pullEvent("key")
   onKeyPressed(key, mainMenu)
end