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

--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()
	end
end

-- Makes sure it has seeds in inventory, then dumps everything else
function DropOff() --fin?
	for i = 2, 16 do
		if turtle.getItemCount(i) < 0 and turtle.getItemDetail(i).name ~= "minecraft:seed" then
			turtle.select(i)
			turtle.dropDown()
		end
	end

	turtle.turnRight()

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

	turtle.suck()
	turtle.suck()
	turtle.turnLeft()
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.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

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

function GetSeedCount()
	return turtle.getItemCount(2), turtle.getItemCount(3)
end

function Replant()
	local seed1, seed2 = GetSeedCount()
	for i=2,3 do
		if seed1 > 0 then
			select(2)
			Replant()
		elseif seed2 > 0 then
			select(3)
			Replant()
		else
			--no seeds, maintenance
			status = 0
		end
	end
end

-- Checks if plant is ready to be harvested, or if soil needs retilling/replanting
function CheckPlant()
	local under = GetBlock(3)
	if under.name == nil then
		turtle.digDown()
	elseif under.name == "minecraft:wheat" and under.state['age'] == 7 then
		turtle.digDown()
		Replant()
	end
end

function Farm()
	-- Are we full yet?
	if turtle.getItemCount(16) > 0 then
		status = 0
	elseif GetBlock(1) == "immersiveengineering:metal_decoration1"
							or GetBlock(1) == "minecraft:hardened_clay" then
		CheckPlant()
		if j == 0 then
			j = 1
			turtle.turnLeft()
			turtle.forward()
			CheckPlant()
			turtle.turnLeft()
		elseif j == 1 then
			j = 0
			turtle.turnRight()
			local front = GetBlock(1)
			if front == "immersiveengineering:metal_decoration1"
								or front == "minecraft:hardened_clay" then
				status = 0
				n = n + 1
			else
				turtle.forward()
				CheckPlant()
				turtle.turnRight()
			end
		end
	else
		turtle.forward()
		CheckPlant()
	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
		print("Farming..")
		Farm()
	end
end