local status = 0
-- 0 = Returning, 1 = Maintenance, 2 = Farming, 3 = Critical
local n = 0
local j = 0
local cornerBlock = "immersiveengineering:metal_decoration1"
local railBlock = "minecraft:hardened_clay"
local harvestBlock = "harvestcraft:pameggplantcrop"
local storageBlock = "minecraft:chest"
local harvestAge = 3

--todo fix return, fix farm

-- Refuels the turtle if fuel levels are low
function Refuel() --fin?
	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 above the turtle, drops anything in slot 1 if it's not coal
function GrabFuel() --fin?
	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.suckUp(16)
	end
end

function DropOff()
	for i = 2, 16 do
		if turtle.getItemCount(i) > 0 then
			turtle.select(i)
			turtle.dropDown()
		end
	end
end

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

-- Returns the turtle to the station
function Return() --fin?
	if status == 0 then
		local front = GetBlock(1)
		if front and front.name == railBlock then
			turtle.turnLeft()
		elseif front and front.name == cornerBlock then
				turtle.turnLeft()
				turtle.forward()
		elseif front and front.name == storageBlock then
			turtle.turnLeft()
			turtle.forward()
			turtle.turnRight()
			turtle.forward()
			turtle.turnLeft()
			turtle.down()
			turtle.back()
			status = 1
		else
			turtle.forward()
		end
	end
end

-- Checks if plant is ready to be harvested
function CheckPlant()
	print("Inspecting farmland..")
	local under = GetBlock(3)
	if under then
		if under.name == harvestBlock then
			if harvestAge ~= nil then
				if under.metadata == harvestAge then
					turtle.digDown()
				end
			else
				turtle.digDown()
			end
		end
	end
end

function Farm()
	-- Are we full yet?
	local front = GetBlock(1)
	if turtle.getItemCount(16) > 0 then
		status = 0
	elseif not front then
		turtle.forward()
		CheckPlant()
	elseif front.name == railBlock or front.name == cornerBlock then
		CheckPlant()
		if j == 0 then
			j = 1
			turtle.turnLeft()
			turtle.forward()
			CheckPlant()
			turtle.turnLeft()
		elseif j == 1 then
			j = 0
			turtle.turnRight()
			local front2 = GetBlock(1)
			if not front2 then
				turtle.forward()
				CheckPlant()
				turtle.turnRight()
			elseif  front2.name == railBlock or front2.name == cornerBlock then
				status = 0
				n = n + 1
			end
		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()
		status = 2
		if n % 2 == 0 and n > 0 then
			for i = 1,5 do
				print("Waiting: " .. 5-i .. " seconds for the plants to grow..")
				sleep(1)
			end
			n = 1
		end
	end
	if status == 2 then
		Farm()
	end
end