local tArgs = {...}
local distance = tonumber(tArgs[1])

if #tArgs ~= 1 then
	print( "Usage: Dig <distance>" )
	return
end

local hasMoved = tonumber(0)
local toMove = tonumber(distance*2 - hasMoved)
local Home = tonumber(0)
local top = false

local fuelLevel = tonumber(0)
local fuelNeeded = false

function fuelget()
	fuelLevel = turtle.getFuelLevel()
end

function fuelNeed()
	fuelget()
	if fuelLevel > 100 then
		fuelNeeded = false
	else
		fuelNeeded = true
	end
end

function fuel()
fuelget()
	if fuelLevel == "unlimited" then
		return true
	end

	if fuelLevel > 100 then
		return true
	end

	if fuelLevel < 100 then
		if hasMoved < distance then
			turtle.turnLeft()
			turtle.turnLeft()
			for i=1, hasMoved do
				turtle.forward()
				Home = Home + 1
			end
		end
		if hasMoved > distance then
			turtle.down()
			for i=1, toMove do
				turtle.forward()
				Home = Home + 1
			end
		end
	end

	if fuelLevel < 100 then
	if Home == toMove or hasMoved then
		print(" ")
		print("Out of fuel. Please refuel me")
		print("Place fuel in Slot 1 !!!")
		print("I will restart myself")

		fuelNeed()

		turtle.select(1)
		while fuelNeeded == true do
			turtle.refuel()
			sleep(3)
			turtle.turnLeft()
			turtle.turnLeft()
			fuelNeed()
		end
		if fuelLevel > 100 then
			for i=1, Home do
				turtle.back()
				if top == true then
					turtle.up()
					top = false
				end
			end
		end
	end
	end
end

function digNormal()
	for i=1, distance do
	fuel()
		turtle.dig()
		turtle.turnLeft()
		turtle.dig()
		turtle.turnRight()
		turtle.turnRight()
		turtle.dig()
		turtle.turnLeft()
		turtle.digDown()
		turtle.forward()
		hasMoved = hasMoved + 1
	end
end


function digTop()
	for i=1, distance do
	fuel()
		turtle.dig()
		turtle.digUp()
		turtle.turnLeft()
		turtle.dig()
		turtle.turnRight()
		turtle.turnRight()
		turtle.dig()
		turtle.turnLeft()
		turtle.forward()
		hasMoved = hasMoved + 1
	end
end

function digUp()
	turtle.turnLeft()
	turtle.dig()
	turtle.turnRight()
	turtle.turnRight()
	turtle.dig()
	turtle.turnLeft()
	turtle.digDown()
	turtle.digUp()
	turtle.up()
	turtle.turnLeft()
	turtle.turnLeft()
	top = true
end

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

print("I'm going to mine "..distance.." blocks from here.")
sleep(2)
print("I will be back soon! Hopefully!")

if turtle.getFuelLevel() < 100 then
	turtle.refuel()
	fuelLevel = turtle.getFuelLevel()
  else
	fuelLevel = turtle.getFuelLevel()
end
if distance < fuelLevel then
	print("Not enough fuel to even try Digging")
	print("Restart program with more fuel")
	print("or less Distance")
  else
    print(fuelLevel)
	digNormal()
	digUp()
	digTop()
	turtle.turnLeft()
	turtle.turnLeft()
	turtle.down()
end