local trees = 23
local currentPos = 0
local lastStatus = 0
local status = 0 -- 0Clueless-1Starting-2Harvesting-3Returning-4onRail


-- refuel the turtle with slot 1, coal
function Refuel()
	turtle.select(1)
	turtle.refuel(3)
end

--grabs fuel from coal chest
function GrabFuel()
	turtle.turnLeft()
	turtle.select(1)
	turtle.suck()
	turtle.turnRight()
end

-- move forward once and suck up items front, left and right
function Forward()
	turtle.forward()
	turtle.suckDown()
	turtle.turnLeft()
	turtle.suck()
	turtle.turnRight()
	turtle.turnRight()
	turtle.suck()
end

-- This function checks where the turtle is located on the rail, it's needed in case the program boots while the
-- turtle is not at the start of the dropoff location
function UpdateStatus()
	local s, under = turtle.inspectDown()
	local s2, front = turtle.inspect()


	lastStatus = status
	if s then
		if under.name == "minecraft:cobblestone" then
			status = 1
		end
		if under.name == "minecraft:torch" then
			status = 4
		end
		if under.name == "minecraft:dirt" then
			turtle.back()
			turtle.left()
		end
	end --todo: check if on right y level, should be if s is false

	if s2 then
		if front.name == "minecraft:chest" then
			turtle.turnLeft()
			turtle.turnLeft()
			status = 1
		end
		if front.name == "minecraft:log" then
			turtle.turnLeft()
			UpdateStatus()
		end
		if front.name == "minecraft:gravel" then
			turtle.turnLeft()
			turtle.turnLeft()
		end
	elseif status == 4 then
		turtle.forward()
	end

	print("Updated Status: " .. lastStatus .. " to " .. status)

end

-- main loop
-- reset -> refuel -> pickup fuel -> chop -> deposit
while true do
	if status == 0 or status == 4 then
		print("Updating status..")
		UpdateStatus()
	end
	if turtle.getItemCount(1) < 16 and status == 1 then
		print("Grabbing Fuel..")
		GrabFuel()
	end
	if turtle.getFuelLevel() < 5 then
		print("Refueling..")
		Refuel()
	end
end