--Fuel Supply Switcher v2
--by SemlerPDX July2016
-- pastebin get JbXXNjrp SwitchFuel

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

--checks to see if door to engine room is open
--opens if it is closed
if (rs.getOutput("back"))~=true then
  rs.setOutput("back",true)
end
  
fset()
textutils.slowPrint("Switching fuel supply from charcoal to coal...", 18)
rs.setOutput("top",true)
sleep(1.75)
fset()
print("Engines are set to burn Coal")
print("")
print("note:")
print("Coal is more abundant but not infinite")
print("Charcoal is infinite but not abundant or efficient")
print("")
print("")
print("  -  press any key to switch back to Charcoal  -")


-- Main Loop --
while true do

  local function fcancel()
    local event, key = os.pullEvent("key")
  end

  local function fmain()
    sleep(1)
  end

  FunctionEnabled = parallel.waitForAny(fcancel,fmain)

  if FunctionEnabled == 1 then
    rs.setOutput("top",false)
	fset()
    textutils.slowPrint("Switching fuel supply from coal to charcoal...", 18)
    sleep(2)
    fset()
    print("Engines are now burning Charcoal")
    sleep(1)
    break
  end
end


-- Door Close Countdown
for n=1,20 do

  local function fcancel()
    local event, key = os.pullEvent("key")
  end

  local function fmain()
    fset()
    print("Engines are now burning Charcoal")
    print("")
    print("")
    print("Closing Door in 5 seconds...")
    print("")
    print("  -  press any key to keep Door Open  -")
    sleep(0.25)
  end

  FunctionEnabled = parallel.waitForAny(fcancel,fmain)

  if FunctionEnabled == 1 then
    fset()
    sleep(1)
    break
  end
end

if FunctionEnabled == 2 then
  rs.setOutput("back",false)
  fset()
end