-- 0 = Return, 1 = Maintenance, 2 = Farming, 3 = Critical
local status = 0
local row = 3
local length = 9
local stepsToGo = 9
local stepsSoFar = 0

--Return to station
function Return()
	if status == 0 then
		local front = GetBlock(1)
		local under = GetBlock(3)

		if front == "minecraft:chest" and under == "minecraft:chest" then
			turtle.turnLeft()
			turtle.turnLeft()
			status = 1
		elseif under == "minecraft:chest" and front ~="minecraft:chest" then
			turtle.turnLeft()
		elseif front == "botania:flower" then
			turtle.dig()
			turtle.forward()
		elseif front == "botania:specialflower" then
			turtle.turnLeft()
		elseif front == "minecraft:chest" and under == "minecraft:stone" then
			turtle.turnLeft()
			turtle.dig()
			turtle.forward()
			turtle.turnRight()
			turtle.forward()
			turtle.turnLeft()
			status = 1
		else
			local under = GetBlock(3)
			if under == "minecraft:stone" or under == "minecraft:grass" then
				turtle.forward()
			elseif under == "minecraft:cobblestone" then
				turtle.back()
				turtle.turnLeft()
			else
				status = 3
			end
		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

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

function PickFlowers()
	local front = GetBlock(1)
	if front == "botania:flower" then
		turtle.dig()
		turtle.forward()
	elseif front == "botania:specialflower" then
		turtle.turnLeft()
		status = 0
		return
	else
		turtle.forward()
	end

	stepsSoFar = stepsSoFar + 1
	if stepsSoFar == stepsToGo then row = row - 1 end
	if row == 0 then stepsToGo = stepsToGo - 1 end

	print("Togo: " .. stepsToGo .. " SoFar:" .. stepsSoFar .. "N: " .. row)

end

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

function DropOff()
	turtle.turnLeft()
	turtle.turnLeft()
	for i=2,16 do
		if turtle.getItemCount(i) > 0 then
			turtle.select(i)
			turtle.dropUp()
		end
	end
	turtle.turnLeft()
	turtle.turnLeft()
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
		n = 3
		stepsToGo = 9
		stepsSoFar = 0

		print("Refueling.. Storing.. Polishing..")
		DropOff()
		GrabFuel()
		print("Maintenance completed!")
		status = 2
	end
	if status == 2 then
		PickFlowers()
	end
	if status == 3 then
		print("Critical error..")
		sleep(20)
		break
	end
end