local prefix = "[Carlos 0.1a] "


-- Funcao printf
local function printf(...) print(string.format(...)) end


-- Funcao combustivel
local function combustivel()
	local restante = turtle.getFuelLevel() -- Combustivel restante
	local suficiente = false

	while true do
		if restante == 0 then
			suficiente = false
			printf("%sSem combustivel restante, tentando reabastecer.", prefix)
			for i = 1, 16 do
				turtle.select(i)
				if turtle.refuel(0) then
	    			local halfStack = math.ceil(turtle.getItemCount(i)/2)
	    			turtle.refuel(halfStack)
	    			restante = turtle.getFuelLevel()
	    			suficiente = true
	    			break
	    		end
	    	end
		else
			printf("%sCombustivel restante: %s", prefix, restante)
			suficiente = true
			break
		end
	end
	return suficiente

end


-- Funcao minerar
local function minerar(a)
	local possivel = combustivel()


	while possivel do

		local i = 1

		repeat
			turtle.dig()
			turtle.forward()
			possivel = combustivel()
			i = i + 1
		until i == a
		break
	end

end


-- Codigo
write(prefix.."Digite a area para ser minerada: ")
local a = io.read()

minerar(a)