Ticket Station

os.loadAPI("btn") -- Load Button API
local ticket = peripheral.wrap("back") -- Wrap the ticket machine peripheral

-- Declare Variables
local curPage = 1
local file
local lineNum
local fullLine
local ticketName
local input


local function readLine(file, lineNum)
  h = fs.open(file,"r")
  for i = 1,lineNum-1 do
    local wasteLine = h.readLine()
  end
  line = h.readLine()
  h.close()
  return line
end

local function getTicketName(fullLine)
  local spot = string.find(fullLine, " = ")+3
  local destName = string.sub(fullLine, spot)
  return destName
end

local function getDestName(lineNum)
  local fullLine = readLine("dests", lineNum)
  local spot = string.find(fullLine, " = ")
  local destName = string.sub(fullLine, -#fullLine, spot)
  return destName
end

local function createTicket(lineNum)
  ticket.createTicket(getTicketName(readLine("dests",lineNum)))
  sleep(2)
  rs.setOutput("right",true)
  sleep(1)
  rs.setOutput("right",false)
end

function buttonPress(name)
  if btn.getText(name) ~= "" then
    btn.activate(name)
    btn.createScreen()
    createTicket(tonumber(name))
    btn.deActivate(name)
    btn.createScreen()
  end
end

-- Enables the drawing of buttons 1-9
-- Disables the drawing of other buttons
function firstPage()
  btn.deActivateAllDraw()
  btn.activateDraw("1")
  btn.activateDraw("2")
  btn.activateDraw("3")
  btn.activateDraw("4")
  btn.activateDraw("5")
  btn.activateDraw("6")
  btn.activateDraw("7")
  btn.activateDraw("8")
  btn.activateDraw("9")
  btn.activateDraw("next")
  btn.activateDraw("edit")
  term.clear()
  term.setCursorPos(1,1)
  btn.createScreen("Ticket Station",colors.white)
  btn.centerText(19,"1",colors.white)
end

-- Enables the drawing of buttons 10-18
-- Disables the drawing of other buttons
function secondPage()
  btn.deActivateAllDraw()
  btn.activateDraw("10")
  btn.activateDraw("11")
  btn.activateDraw("12")
  btn.activateDraw("13")
  btn.activateDraw("14")
  btn.activateDraw("15")
  btn.activateDraw("16")
  btn.activateDraw("17")
  btn.activateDraw("18")
  btn.activateDraw("next")
  btn.activateDraw("back")
  btn.deActivateDraw("edit")
  term.clear()
  term.setCursorPos(1,1)
  btn.createScreen("Ticket Station",colors.white)
  btn.centerText(19,"2",colors.white)
end

-- Enables the drawing of buttons 19-27
-- Disables the drawing of other buttons
function thirdPage()
  btn.deActivateAllDraw()
  btn.activateDraw("19")
  btn.activateDraw("20")
  btn.activateDraw("21")
  btn.activateDraw("22")
  btn.activateDraw("23")
  btn.activateDraw("24")
  btn.activateDraw("25")
  btn.activateDraw("26")
  btn.activateDraw("27")
  btn.activateDraw("back")
  btn.deActivateDraw("edit")
  term.clear()
  term.setCursorPos(1,1)
  btn.createScreen("Ticket Station",colors.white)
  btn.centerText(19,"3",colors.white)
end

-- Function called when the "Back" button is pressed
-- Determines what page is currently selected and goes back 1
-- Not a valid function when the first page is selected
function back()
  if curPage == 2 then
    curPage = 1
    firstPage()
  elseif curPage == 3 then
    curPage = 2
    secondPage()
  end
end

-- Function called when the "Next" button is pressed
-- Determines what page is currently selected and goes forward 1
-- Not a vlid function when the last page is selected
function next()
  if curPage == 1 then
    curPage = 2
    secondPage()
  elseif curPage == 2 then
    curPage = 3
    thirdPage()
  end
end

local function loadButtons()
  -- First Page Buttons
  btn.fillTable("1",3,17,3,5,getDestName(1),buttonPress,nil,true)
  btn.fillTable("2",19,33,3,5,getDestName(2),buttonPress,nil,true)
  btn.fillTable("3",35,49,3,5,getDestName(3),buttonPress,nil,true)
  btn.fillTable("4",3,17,8,10,getDestName(4),buttonPress,nil,true)
  btn.fillTable("5",19,33,8,10,getDestName(5),buttonPress,nil,true)
  btn.fillTable("6",35,49,8,10,getDestName(6),buttonPress,nil,true)
  btn.fillTable("7",3,17,13,15,getDestName(7),buttonPress,nil,true)
  btn.fillTable("8",19,33,13,15,getDestName(8),buttonPress,nil,true)
  btn.fillTable("9",35,49,13,15,getDestName(9),buttonPress,nil,true)

  -- Second Page Buttons
  btn.fillTable("10",3,17,3,5,getDestName(10),buttonPress,nil,false)
  btn.fillTable("11",19,33,3,5,getDestName(11),buttonPress,nil,false)
  btn.fillTable("12",35,49,3,5,getDestName(12),buttonPress,nil,false)
  btn.fillTable("13",3,17,8,10,getDestName(13),buttonPress,nil,false)
  btn.fillTable("14",19,33,8,10,getDestName(14),buttonPress,nil,false)
  btn.fillTable("15",35,49,8,10,getDestName(15),buttonPress,nil,false)
  btn.fillTable("16",3,17,13,15,getDestName(16),buttonPress,nil,false)
  btn.fillTable("17",19,33,13,15,getDestName(17),buttonPress,nil,false)
  btn.fillTable("18",35,49,13,15,getDestName(18),buttonPress,nil,false)

  -- Third Page Butons
  btn.fillTable("19",3,17,3,5,getDestName(19),buttonPress,nil,false)
  btn.fillTable("20",19,33,3,5,getDestName(20),buttonPress,nil,false)
  btn.fillTable("21",35,49,3,5,getDestName(21),buttonPress,nil,false)
  btn.fillTable("22",3,17,8,10,getDestName(22),buttonPress,nil,false)
  btn.fillTable("23",19,33,8,10,getDestName(23),buttonPress,nil,false)
  btn.fillTable("24",35,49,8,10,getDestName(24),buttonPress,nil,false)
  btn.fillTable("25",3,17,13,15,getDestName(25),buttonPress,nil,false)
  btn.fillTable("26",19,33,13,15,getDestName(26),buttonPress,nil,false)
  btn.fillTable("27",35,49,13,15,getDestName(27),buttonPress,nil,false)

  -- Misc Buttons
  btn.fillTable("back",2,9,17,19,"Back",back,colors.red,true)
  btn.fillTable("next",43,50,17,19,"Next",next,colors.red,true)
  btn.fillTable("edit",2,9,17,19,"Edit",edit,colors.red,true)
end

function edit()
  btn.deActivateAllDraw()
  btn.createScreen()
  input = ""
  term.clear()
  term.setCursorPos(1,1)
  print("Please enter the ticket station password: ")
  input = read("*")
  if input == "trainsarecool" then
    shell.run("edit dests")
  else
    term.setCursorPos(1,4)
    print("Incorrect Password....")
    sleep(2)
  end
  loadButtons()
  firstPage()
end

loadButtons()
firstPage()
while true do
  event, button, x, y = os.pullEvent("mouse_click") -- Check for a mouse click
  btn.checkClick(x,y) -- Determine where the user clicked. See ButtonAPI
end