long = 39
larg = 6
balance = 1
fuel = 0
coal = 0
--- Fonctions ---

function refuel()
	fuel = turtle.getFuelLevel()
	if fuel < 10 then
		turtle.refuel(2)
	end
end

function back()
	repeat
		turtle.forward()
	until turtle.detect()
	turtle.turnLeft()
end

function drop()
turtle.select(2)
turtle.dropDown()
turtle.select(3)
turtle.dropDown()

function recharge()
	turtle.select(1)
	coal = turtle.getItemCount(1)
	if coal == 0 then
		turtle.suckUp()
	end
end

function longueur()
	cache = long
	while cache ~= 0 do
		turtle.dig()
		turtle.forward()
		cache = cache - 1
		print(cache)
	end
	cache = long
	balance = balance * (-1)
end

function Turn()
	if balance > 0 then
		turtle.turnRight()
		turtle.forward()
		turtle.dig()
		turtle.forward()
		turtle.turnRight()
	elseif balance < 0 then
		turtle.turnLeft()
		turtle.forward()
		turtle.dig()
		turtle.forward()
		turtle.turnLeft()
	end
end

--- Programme ---

recharge()
while larg ~= 0 do
	refuel()
	longueur()
	Turn()
	larg = larg - 1
end

repeat
turtle.forward()
until turtle.detect()
turtle.turnRight()
os.reboot()