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

if #tArgs < 1 then
	areasToMine = 1
	print(" Defaulting to 1 areas to mine")

-- Slot Variables
lastMiningSlot = 11
numberOfMiningSlots = lastMiningSlot

torchSlot = 12
anchorSlot = 13
chestSlot = 14
outputSlot = 15
fuelChestSlot = 16

-- Mining Variables
layer = 0
line = 0

-- Inventory variables
room = 0

function fuel()
	if turtle.getFuelLevel() < 1000 then
		-- Deposit inventory contents in the chest
		turtle.digDown()
		turtle.select(chestSlot)
		turtle.placeDown()
		turtle.select(lastMiningSlot)
		turtle.dropDown()
		--

  		-- Use fuel from fuel Chest
  		turtle.digUp()
  		turtle.select(fuelChestSlot)
  		turtle.placeUp()
  		turtle.suckUp()
  		turtle.refuel()
  		turtle.digUp()
		--

		-- Retrieve chest & its contents
		turtle.select(lastMiningSlot)
		turtle.suckDown()
		turtle.digDown()
		--

		turtle.select(1)
	end
end

function empty()
	turtle.digUp()
	turtle.select(outputSlot)
	turtle.placeUp()
	for i = 1,numberOfMiningSlots do
		turtle.select(i)
		turtle.dropUp()
	end
	turtle.select(outputSlot)
	turtle.digUp()
	turtle.select(1)
end

function inv()
	for i = 1,numberOfMiningSlots do
		if turtle.getItemCount(i) == 0 then
			room = room + 1
		end
	end

	if room == 0 then
		empty()
	else
		room = 0
	end
end



function forward()
	while not turtle.forward() do
		inv()
		if not turtle.dig() then
			turtle.attack()
		end
	end
end

function up()
	while not turtle.up() do
		inv()
		turtle.digUp()
	end
end

function down()
	while not turtle.down() do
		inv()
		turtle.digDown()
	end
end

function updown()
	inv()
	turtle.digUp()
	inv()
	turtle.digDown()
end

function turnLeft()
	turtle.turnLeft()
	forward()
	turtle.turnLeft()
end

function turnRight()
	turtle.turnRight()
	forward()
	turtle.turnRight()
end

function moveToChunkAbove()
	for i=1,3 do
		up()
	end
	layer = layer + 1
end

function moveToChunkBelow()
	for i=1,3 do
		down()
	end
	layer = layer - 1
end

function moveToChunkRight()
	for i=1,5 do
		forward()
	end
	turtle.turnRight()
	forward()
	turtle.turnRight()
	line = line + 1
end

function moveToChunkLeft()
	for i=1,2 do
		turtle.turnLeft()
	end
	forward()
	turtle.turnLeft()
	forward()
	turtle.turnRight()
	line = line + 1
end

function returnToOrigin()
	for i=1,2 do
		turtle.turnLeft()
	end
	for i=1,6 do
		forward()
	end
	turtle.turnLeft()
	for i=1,12 do
		forward()
	end
	turtle.turnLeft()
	line = 0
end

function placeTorch()
	turtle.digDown()
	turtle.select(torchSlot)
	turtle.placeDown()
	turtle.select(1)
end

function mineLine()
	updown()
	for i=1,2 do
		forward()
		updown()
	end
end

function mineChunk()
	torchPlaced = 0
	for i=1,2 do
		mineLine()
		if torchPlaced == 0 and layer == 0 and line % 2 == 0 then
			placeTorch()
			torchPlaced = 1
		end
		turnLeft()
		mineLine()
		if torchPlaced == 0 and layer == 0 and line % 2 ~= 0 then
			placeTorch()
			torchPlaced = 1
		turnRight()
	end
end

function mineThickLine()
	for i=1,3 do
		mineChunk()
	end
end

function mineLayer()
	if layer == 0 then
		setAnchor()
	end
	mineThickLine()
	if layer == 0 then
		setAnchor()
	end
	moveToChunkRight()
	mineThickLine()
	moveToChunkLeft()
	mineThickLine()
	returnToOrigin()
end

function mineArea()
	for i=1,3 do
		mineLayer()
		moveToChunkAbove()
	end
	for i=1,9 do
		down()
	end
end

function moveToNextArea()
	getAnchor()
	turtle.select(1)
	turtle.turnLeft()
	for i=1,12 do
		forward()
	end
	turtle.turnRight()
end


function setAnchor()
	turtle.turnRight()
	forward()
	turtle.select(anchorSlot)
	if not turtle.compareDown() then
		turtle.digDown()
		turtle.placeDown()
		turtle.select(1)
	end
	for i=1,2 do
		turtle.turnRight()
	end
	forward()
	turtle.turnRight()
end

function getAnchor()
	turtle.turnRight()
	forward()
	turtle.select(anchorSlot)
	turtle.digDown()
	turtle.select(1)
	for i=1,2 do
		turtle.turnRight()
	end
	forward()
	turtle.turnRight()
end

turtle.select(1)
for i=1,areasToMine do
	fuel()
	mineArea()
	moveToNextArea()
end