Control

-- slots 1-8 Sand
-- slots 9-12 cobblestone
-- slot 13 empty
-- slot 14 cobblestone
-- slot 15 sand
-- slot 16 coal

local w,h = term.getSize()
local selection = 0
local internalselection = 0
local range = 0
local currentrange = 0
local ypos = 1
local fuel
local fuelava
local counter = 1
local sandcounter=0
local cobblecounter=0

--Some draw functions to get us started
local function printCentered(str, ypos)
  term.setCursorPos(w/2 - #str/2, ypos)
  term.write(str)
end

local function printFarLeft(str, ypos)
  term.setCursorPos(1, ypos)
  term.write(str)
end

local function printLeft(str, ypos)
  term.setCursorPos(5, ypos)
  term.write(str)
end

local function printLeft2(str, ypos)
  term.setCursorPos(10, ypos)
  term.write(str)
end

local function printRight(str, ypos)
  term.setCursorPos(w - 15, ypos)
  term.write(str)
end

local function printRight2(str, ypos)
  term.setCursorPos(w - 25, ypos)
  term.write(str)
end

local function printFarRight(str, ypos)
  term.setCursorPos(w - #str, ypos)
  term.write(str)
end

function drawHeader()
	printCentered("Turtle Control", 1)
	printCentered(string.rep("-", w+1), 2)

-- print fuel level
	fuel = turtle.getFuelLevel()
	printFarLeft("Fuel " ,3)
	print(fuel)

-- print avilable fuel
	fuelava = turtle.getItemCount(16)
	printFarLeft("Fuel Available " ,5)
	print(fuelava)

-- Print Range
	printRight("Range Left "..tostring(range),5)
end

function drawMainMenu()
	printLeft2("1. Forward", 7)
	printRight("5. Up", 7)

	printLeft2("2. Backward", 8)
	printRight("6. Down", 8)

	printLeft2("3. Left", 9)

	printLeft2("4. Right", 10)
	printRight("8. Quit", 10)

	printLeft2("Selection: ", 12)
	selection = tonumber(read())
end

function forward()
	term.clear()
	term.setCursorPos(1,1)
	internalselection=0
	drawHeader()

	printLeft("Forward", 7)
	printLeft("-------", 8)
	printLeft("1. Forward 1", 9)
	printRight("3. Main Menu", 9)
	printLeft("2. Forward range", 10)

	printLeft("Selection: ", 12)
	internalselection = tonumber(read())

	if internalselection==1 then
		turtle.forward()
		term.clear()
		term.setCursorPos(1,1)
	end

	if internalselection==2 then
		term.clear()
		term.setCursorPos(1,1)

		drawHeader()

		printLeft("Forward Range", 7)
		printLeft("-------------", 8)
		printLeft("How far: ", 9)
		currentrange = 0
		range = tonumber(read())

		repeat
			term.clear()
			term.setCursorPos(1,1)
			drawHeader()

			turtle.forward()
			currentrange = currentrange + 1
		until currentrange == range

		range=0
	end
end

function backward()
	term.clear()
	term.setCursorPos(1,1)
		internalselection=0
	drawHeader()

	printLeft("Backward", 7)
	printLeft("--------", 8)
	printLeft("1. Backward 1", 9)
	printRight("3. Main Menu", 9)
	printLeft("2. Backward range", 10)

	printLeft("Selection: ", 12)
	internalselection = tonumber(read())

	if internalselection==1 then
		turtle.back()
		term.clear()
		term.setCursorPos(1,1)
	end

	if internalselection==2 then
		term.clear()
		term.setCursorPos(1,1)

		drawHeader()

		printLeft("Backward Range", 7)
		printLeft("-------------", 8)
		printLeft("How far: ", 9)
		currentrange = 0
		range = tonumber(read())

		repeat
			term.clear()
			term.setCursorPos(1,1)
			drawHeader()

			turtle.back()
			currentrange = currentrange + 1
		until currentrange == range

		range=0
	end

	if internalselection==3 then
		term.clear()
		term.setCursorPos(1,1)
		internalselection=0
		selection=0
		main()
	end
end

function up()
	term.clear()
	term.setCursorPos(1,1)
	internalselection=0
	drawHeader()

	printLeft("Up", 7)
	printLeft("--", 8)
	printLeft("1. Up 1", 9)
	printRight("3. Main Menu", 9)
	printLeft("2. Up range", 10)

	printLeft("Selection: ", 12)
	internalselection = tonumber(read())

	if internalselection==1 then
		turtle.up()
		term.clear()
		term.setCursorPos(1,1)
	end

	if internalselection==2 then
		term.clear()
		term.setCursorPos(1,1)

		drawHeader()

		printLeft("Up Range", 7)
		printLeft("--------", 8)
		printLeft("How far: ", 9)
		currentrange = 0
		range = tonumber(read())

		repeat
			term.clear()
			term.setCursorPos(1,1)
			drawHeader()

			turtle.up()
			currentrange = currentrange + 1
		until currentrange == range

		range=0
	end

	if internalselection==3 then
		term.clear()
		term.setCursorPos(1,1)
		internalselection=0
		selection=0
		main()
	end
end

function down()
	term.clear()
	term.setCursorPos(1,1)
	internalselection=0
	drawHeader()

	printLeft("Down", 7)
	printLeft("----", 8)
	printLeft("1. Down 1", 9)
	printRight("3. Main Menu", 9)
	printLeft("2. Down range", 10)

	printLeft("Selection: ", 12)
	internalselection = tonumber(read())

	if internalselection==1 then
		turtle.down()
		term.clear()
		term.setCursorPos(1,1)
	end

	if internalselection==2 then
		term.clear()
		term.setCursorPos(1,1)

		drawHeader()

		printLeft("Down Range", 7)
		printLeft("----------", 8)
		printLeft("How far: ", 9)
		currentrange = 0
		range = tonumber(read())

		repeat
			term.clear()
			term.setCursorPos(1,1)
			drawHeader()

			turtle.down()
			currentrange = currentrange + 1
		until currentrange == range

		range=0
	end

	if internalselection==3 then
		term.clear()
		term.setCursorPos(1,1)
		internalselection=0
		selection=0
		main()
	end
end

function main()
--PROGRAM START
term.clear()
term.setCursorPos(1,1)

	while true do
		drawHeader()
		drawMainMenu()

		if fuel < 5 then
			turtle.select(16)
			turtle.refuel(1)
			turtle.select(1)
		end

		if selection==1 then
			forward()
		end

		if selection==2 then
			backward()
		end

		if selection==3 then
			turtle.turnLeft()
			term.clear()
			term.setCursorPos(1,1)
		end

		if selection==4 then
			turtle.turnRight()
			term.clear()
			term.setCursorPos(1,1)
		end

		if selection==5 then
			up()
		end

		if selection==6 then
			down()
		end


		if selection==8 then
			term.clear()
			term.setCursorPos(1,1)
			break
		end

	end
end

main()