local x, y, z = 0, 0, 0
local f = 0
local limite = 5

print("Iniciando modo aleatorio...")
print("Raio limite: " .. limite .. " blocos.")

while true do
    -- Checagem de Combustível!
    if turtle.getFuelLevel() == 0 then
        print("Alerta: Acabou o combustivel! Coloque carvao e digite 'refuel all'.")
        break -- Para o programa
    end

    local acao = math.random(1, 5)

    if acao == 1 then
        local nx, nz = x, z
        if f == 0 then nz = nz + 1
        elseif f == 1 then nx = nx + 1
        elseif f == 2 then nz = nz - 1
        elseif f == 3 then nx = nx - 1
        end

        if math.abs(nx) <= limite and math.abs(nz) <= limite then
            if turtle.forward() then
                x, z = nx, nz
            end
        else
            turtle.turnRight()
            f = (f + 1) % 4
        end

    elseif acao == 2 then
        if y + 1 <= limite then
            if turtle.up() then
                y = y + 1
            end
        end

    elseif acao == 3 then
        if y - 1 >= -limite then
            if turtle.down() then
                y = y - 1
            end
        end

    elseif acao == 4 then
        turtle.turnRight()
        f = (f + 1) % 4

    elseif acao == 5 then
        turtle.turnLeft()
        f = (f - 1) % 4
        if f < 0 then f = 3 end
    end

    os.sleep(0.5)
end