CarTurtle

rednet.open("right")

con = "false"

result = fs.exists("pos")
if result == true then
  file = io.open("pos", "r")
  pos = file.read()
  file:close()
else
  pos = "back"
  file = fs.open("pos", "w")
  file.write(pos)
  file:close()
end
if pos == "back" then
  eng = peripheral.wrap("front")
else
  eng = peripheral.wrap("bottom")
end

-- screen display
term.clear()
x,y = term.getSize()
term.setCursorPos(x/2, y/3-1)
print("W")
term.setCursorPos(x/2-3, y/3)
print("Forward")
term.setCursorPos(x/5, y/3*2)
print("A")
term.setCursorPos(x/2, y/3*2)
print("S")
term.setCursorPos(x/5*4, y/3*2)
print("D")
term.setCursorPos(x/5-2, y/3*2+1)
print("Left")
term.setCursorPos(x/2-2, y/3*2+1)
print("Back")
term.setCursorPos(x/5*4-2, y/3*2+1)
print("Right")
term.setCursorPos(1, y-3)
print("[Shift]")
term.setCursorPos(3,y-2)
print("Up")
term.setCursorPos(1, y-1)
print("[Ctrl]")
term.setCursorPos(2, y)
print("Down")


while true do
  event, param = os.pullEvent()
  if param ~= 31 and event == "key" then
    if pos == "top" then
      turtle.forward()
      turtle.down()
      turtle.turnRight()
      turtle.turnRight()
      pos = "back"
      file = fs.open("pos", "w")
      file.write(pos)
      file:close()
      eng = peripheral.wrap("front")
    end
    if param == 17 then
      eng.move(2, false, false)
      os.sleep(1)
      turtle.forward()
    elseif param == 32 then
      eng.move(5, false, false)
      turtle.turnRight()
      turtle.forward()
      turtle.turnLeft()
      sleep(.2)
    elseif param == 30 then
      eng.move(4, false, false)
      turtle.turnLeft()
      turtle.forward()
      turtle.turnRight()
      sleep(.2)
    elseif param == 42 then
      eng.move(1, false, false)
      turtle.up()
      sleep(1)
    elseif param == 29 then
      eng.move(0, false, false)
      turtle.down()
      sleep(1)
    end
  elseif param == 31 then
    if pos == "back" then
      turtle.up()
      turtle.forward()
      turtle.turnRight()
      turtle.turnRight()
      pos = "top"
      file = fs.open("pos", "w")
      file.write(pos)
      file:close()
      eng = peripheral.wrap("bottom")
    end
    eng.move(3, false, false)
    turtle.forward()
    sleep(1)
  end
end