Touchscreen Menu

-- Touchscreen Program using Touchscreen API
if viewportAPI then os.unloadAPI("viewportAPI") end
os.loadAPI("viewportAPI")
if buttonAPI then os.unloadAPI("buttonAPI") end
os.loadAPI("buttonAPI")
if eventDispatcherAPI then os.unloadAPI("eventDispatcherAPI") end
os.loadAPI("eventDispatcherAPI")

-- Declaring Vars
rSide = "top"
amenuItems = {}
abuttons = {}
aCurrentOrder = {}
foodAmount = 1

-- Filesystem Setup
if not fs.exists("/menu") then
   fs.makeDir("/menu")
   print("Created menu folder. Please enter items before running again.")
   return
end

-- Creating Viewport for Buttons
viewport = viewportAPI.new({term = term})

-- Function for Button
function clickHandler(element, posX, posY)
  for i=1,#amenuItems do
   if element.text == amenuItems[i] then
    cfile = fs.open("menu/"..amenuItems[i], "r")
    cfileColor = cfile.readLine()
    for i=1,foodAmount do
     aCurrentOrder[#aCurrentOrder+1] = cfileColor
    end
    cfile.close()
   end
  end
  element.backgroundColor = colors.lightGray
  viewport:redraw()
  --redstone.setBundledOutput(rSide, colors.white)
  sleep(0.1)
  element.backgroundColor = colors.white
  --redstone.setBundledOutput(rSide,0)
  return true
end

function sendOrder(element, posX, posY)
 element.backgroundColor = colors.gray
 element.text = "Processing"
 viewport:redraw()
 for i=1,#aCurrentOrder do
  color = aCurrentOrder[i]-0
  redstone.setBundledOutput(rSide, color)
  sleep(0.1)
  redstone.setBundledOutput(rSide, 0)
  sleep(0.1)
 end
 aCurrentOrder = {}
 element.backgroundColor = colors.lightGray
 element.text = "Checkout"
 viewport:redraw()
 return true
end

function cycleFoodAmount(element, posX, posY)
 element.backgroundColor = colors.gray
 viewport:redraw()
 sleep(0.1)
 element.backgroundColor = colors.lightGray
 if foodAmount == 1 then foodAmount = 8 element.text = foodAmount.."" return true
 elseif foodAmount == 8 then foodAmount = 16 element.text = foodAmount.."" return true
 else foodAmount = 1 element.text = foodAmount.."" return true end
end

topButton = buttonAPI.new({
    x = 2,
    y = 2,
    width = buttonAPI.width(0.95),
    height = 2,
    backgroundColor = colors.purple,
    textColor = colors.white,
    text = "Hyps Fried Chicken Menu" })
viewport:addElement(topButton)

checkoutButton = buttonAPI.new({
    x = buttonAPI.width(0.20),
    y = buttonAPI.height(0.90),
    width = buttonAPI.width(0.80),
    height = 2,
    backgroundColor = colors.lightGray,
    textColor = colors.white,
    callback = sendOrder,
    text = "Checkout" })
viewport:addElement(checkoutButton)

foodAmountButton = buttonAPI.new({
    x = 2,
    y = buttonAPI.height(0.90),
    width = buttonAPI.width(0.10),
    height = 2,
    backgroundColor = colors.lightGray,
    textColor = colors.white,
    callback = cycleFoodAmount,
    text = foodAmount.."" })
viewport:addElement(foodAmountButton)

amenuItems = fs.list("/menu")
yStep = 2
if amenuItems ~= nil then
 for i=1,#amenuItems do
  buttonX = 2
  buttonY = 3*yStep
  if i % 2 == 0 then
   buttonX = buttonAPI.width(0.55)
   yStep = yStep + 1
  end
  abuttons[i] = buttonAPI.new({
    x = buttonX,
    y = buttonY,
    width = buttonAPI.width(0.45),
    height = 2,
    callback = clickHandler,
    text = amenuItems[i] })
 end
else
 error()
end

for i=1,#abuttons do
 viewport:addElement(abuttons[i])
end
viewport:redraw()

eventDispatcherAPI.addHandler("mouse_click", function(event, side, xPos, yPos)
    viewport:handleClick(xPos, yPos)
end)

eventDispatcherAPI.runDispatchLoop()