local state = 0
-- 0 = Returning, 1 = Maintenance, 2 = Farming, 3 = Critical
local n = 0

-- Refuels the turtle if fuel levels are low
function Refuel()
	print("Refueling..")
	turtle.select(1)
	if not turtle.refuel(3) then
		print("Fuel reserves low.. Returning home")
		status = 0
	end
end

-- Grabs fuel from fuelchest under the turtle, drops anything in slot 1 if it's not coal
function GrabFuel()
	if turtle.getItemCount(1) > 0 then
		if turtle.getItemDetail(1).name ~= "minecraft:coal" then
			print("That's not fuel.. Ew!")
			turtle.select(1)
			turtle.drop()
		end
	end
	if turtle.getItemCount(1) < 16 and status == 1 then
		print("Grabbing Fuel..")
		turtle.select(1)
		turtle.suckDown()
	end
end

-- Stores everything but fuel in the dropoff chest above the turtle
function DropOff()
	n = n + 1
	for i=2,16 do
		if turtle.getItemCount(i) > 0 then
			turtle.select(i)
			turtle.dropUp()
		end
	end
end

-- Collect that sweet hemp
function Farm()
	-- Are we full yet?
	if turtle.getItemCount(16) > 0 then
		status = 0
	elseif GetBlock(1) == "immersiveengineering:metal_decoration1" then
		turtle.digDown()
		turtle.turnLeft()
		turtle.forward()
		turtle.digDown()
		turtle.turnLeft()
	else
		turtle.forward()
		turtle.digDown()
	end
end

-- Returns the turtle to the station
function Return()
	if status == 0 then
		front = GetBlock(1)
		if front == "immersiveengineering:metal_decoration1" then
			turtle.turnLeft()
		elseif front == "minecraft:hardened_clay" then
			if GetBlock(3) == "minecraft:chest" then
				turtle.turnLeft()
				turtle.forward()
				turtle.down()
				turtle.down()
				turtle.back()
				status = 1
			else
				turtle.turnLeft()
				turtle.forward()
			end
		else
			turtle.forward()
		end
	end
end

-- Inspects the block infront, above or below the turtle.
function GetBlock(side)
	if side == 1 then
		local s, d = turtle.inspect()
		if s then return d.name else return false end
	elseif side == 2 then
		local s, d = turtle.inspectUp()
		if s then return d.name else return false end
	elseif side == 3 then
		local s, d = turtle.inspectDown()
		if s then return d.name else return false end
	end
end


-- Main Loop
while true do
	if turtle.getFuelLevel() < 10 then
		refuel()
	end
	if status == 0 then
		print("Finding home..")
		Return()
	end
	if status == 1 then
		print("Refueling.. Storing.. Polishing..")
		DropOff()
		GrabFuel()
		print("Maintenance completed!")
		turtle.forward()
		turtle.up()
		turtle.up()
		status = 2
		if n % 3 == 0 then
			for i = 1,60 do
				print("Waiting: " .. i .. " seconds for the plants to grow..")
			end
		end
	end
	if status == 2 then
		print("Searching for hemp..")
		Farm()
	end
end