menu

local termWidth, termHeight = term.getSize()
local selectedItem = 1
local onMainMenu = true
local onNoteMenu = false
local onFileMenu = false
local onAppsMenu = false
local onGameMenu = false
local name = " "

function continue()
  term.setCursorPos(1,17)
  print("PRESS ANY KEY TO CONTINUEO.")
  os.pullEvent("key")
end

function clear()
  term.clear()
  term.setCursorPos(1,1)
end

function Help()
  clear()
  shell.run("readme")
  continue()
  sleep(1)
end

function Notes()
  name = "Notes"
  onNoteMenu = true
  selectedItem = 1
 while onNoteMenu do
   menupos()
   printMenu(noteMenu)
   event, key = os.pullEvent("key")
   onKeyPressed(key, noteMenu)
 end
end

function noteChoice1()
  shell.run("OS/notepad")
  continue()
  sleep(1)
end

function noteChoice2()
  shell.run("OS/noteread")
  continue()
  sleep(1)
end

function noteChoice3()
  onNoteMenu = False
  selectedItem = 1
end

function Files()
  name = "Files"
  onFileMenu = true
  selectedItem = 1
 while onFileMenu do
   menupos()
   printMenu(fileMenu)
   even, key = os.pullEvent("key")
   onKeyPressed(key, fileMenu)
 end
end

function fileChoice1()
  clear()
  shell.run("OS/.search")
  continue()
  sleep(1)
end

function fileChoice2()
  clear()
  shell.run("OS/editor")
  continue()
  sleep(1)
end

function fileChoice3()
  clear()
  shell.run("OS/createfile")
  continue()
  sleep(1)
end

function fileChoice4()
  onFileMenu = False
  selectedItem = 1
end

function Apps()
  name = "Programs"
  onAppsMenu = true
  selectedItem = 1
 while onAppsMenu do
   menupos()
   printMenu(appsMenu)
   event, key = os.pullEvent("key")
   onKeyPressed(key, appsMenu)
 end
end

function appsChoice1()
  clear()
  shell.run("programs/calculator")
  continue()
  sleep(1)
end

function appsChoice2()
  clear()
  shell.run("dj")
  continue()
  sleep(1)
end

function appsChoice3()
  clear()
  shell.run("programs/tarnchat")
  continue()
  sleep(1)
end

function appsChoice4()
  clear()
  shell.run("OS/run")
  continue()
  sleep(1)
end

function appsChoice5()
  onAppsMenu = False
  selectedItem = 1
end

function Games()
  name = "Games"
  onGameMenu = true
  selectedItem = 1
 while onGameMenu do
   menupos()
   printMenu(gameMenu)
   event, key = os.pullEvent("key")
   onKeyPressed(key, gameMenu)
 end
end

function gameChoice1()
  clear()
  shell.run("programs/slots")
  continue()
  sleep(1)
end

function gameChoice2()
  clear()
  shell.run("adventure")
  continue()
  sleep(1)
end

function gameChoice3()
  clear()
  shell.run("worm")
  continue()
  sleep(1)
end

function gameChoice4()
  onGameMenu = False
  selectedItem = 1
end

function Exit()
  clear()
 if fs.exists("OS/.lock") then
   shell.run("OS/.lock")
 else
   onMainMenu = false
 end
end

function Shutdown()
  clear()
  os.shutdown()
end

function line()
write("-------------------------------------------------")
end

local xpos1 = 2

function menupos()
  term.clear()
  term.setCursorPos(1,3)
  line()
  term.setCursorPos(1,18)
  line()
  term.setCursorPos(12,1)
  print("Frozen OS Beta 2.1")
  term.setCursorPos(18,2)
  print(name)
  term.setCursorPos(1,6)
end

mainMenu = {
[1] = { text = "Help", handler = Help },
[2] = { text = "Notepad", handler = Notes },
[3] = { text = "Files", handler = Files },
[4] = { text = "Programs", handler = Apps },
[5] = { text = "Games", handler = Games },
[6] = { text = "Exit", handler = Exit },
[7] = { text = "Shutdown", handler = Shutdown }
}

noteMenu = {
[1] = { text = "Notepad", handler = noteChoice1 },
[2] = { text = "Read Notes", handler = noteChoice2 },
[3] = { text = "Back", handler = noteChoice3 }
}

fileMenu = {
[1] = { text = "Search", handler = fileChoice1 },
[2] = { text = "Edit", handler = fileChoice2 },
[3] = { text = "Make Folder", handler = fileChoice3 },
[4] = { text = "Back", handler = fileChoice4 }
}

appsMenu = {
[1] = { text = "Calculator", handler = appsChoice1 },
[2] = { text = "DJ", handler = appsChoice2 },
[3] = { text = "TarnChat", handler = appsChoice3 },
[4] = { text = "Run a Program", handler = appsChoice4 },
[5] = { text = "Back", handler = appsChoice5 }
}

gameMenu = {
[1] = { text = "Slots", handler = gameChoice1 },
[2] = { text = "Adventure", handler = gameChoice2 },
[3] = { text = "Worms", handler = gameChoice3 },
[4] = { text = "Back", handler = gameChoice4 }
}

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

function onKeyPressed( key, menu )
 if key == 28 then
   onItemSelected(menu)
 elseif key == 200 then
  if selectedItem > 1 then
    selectedItem = selectedItem - 1
  end
 elseif key == 208 then
  if selectedItem < #menu then
    selectedItem = selectedItem + 1
  end
 end
end

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

function main()
 while onMainMenu do
   name = "                 "
   menupos()
   printMenu(mainMenu)
   event, key = os.pullEvent("key")
   onKeyPressed(key,mainMenu)
 end
end

main()