function refuel()
	if turtle.getFuelLevel() < 15 then
		turtle.select(1)
		turtle.refuel(1)
	end
end

function interactTree()
	a, b = turtle.inspect()
	if a then
		if b.name == "minecraft:sapling" then
		elseif b.name == "minecraft:log" then
			mineTree()
		else
			print("WARNING: Unknown block found: ", b.name)
			turtle.dig()
			plantSaplings()
		end
	else
		--plantSaplings()
	end
end

function plantSaplings()

end

function mineTree()

end

function startup()
	refuel()
	turtle.forward()
	turtle.forward()
	turtle.forward()
end

function harvest()
	-- Go forward one lane
	for i=1, 7 do
		refuel()
		turtle.turnLeft()
		interactTree()
		turtle.turnRight()
		turtle.turnRight()
		interactTree()
		turtle.turnLeft()
		turtle.forward()
		turtle.forward()
		turtle.forward()
	end

	-- Switch to right next lane

	turtle.turnRight()
	for i=1, 6 do
		refuel()
		turtle.forward()
	end
	turtle.turnRight()

	turtle.forward()
	turtle.forward()

	-- Go forward one lane

	for i=1, 7 do
		refuel()
		turtle.turnLeft()
		interactTree()
		turtle.turnRight()
		turtle.turnRight()
		interactTree()
		turtle.turnLeft()
		turtle.forward()
		turtle.forward()
		turtle.forward()
	end

	-- Switch to right next lane

	turtle.turnLeft()
	for i=1, 6 do
		refuel()
		turtle.forward()
	end
	turtle.turnLeft()

	turtle.forward()
	turtle.forward()
end

startup()
harvest()