local energy_ring = 3051; -- Your energy ring
local energy_ring_equiped = 3088; -- Ring changes id when equiped
local original_ring = getFinger(); -- Your original ring
local healthp_for_energy = 50;
local healthp_for_original = 80;
local manap_for_original = 25;

macro(1000, "e-ring", function()
 if (manapercent() <= manap_for_original and getFinger():getId() ~= original_ring:getId()) then
   g_game.equipItem(original_ring);
 elseif (hppercent() <= healthp_for_energy and manapercent() >= manap_for_original and getFinger():getId() ~= energy_ring) then
     local ring = findItem(energy_ring);
     if (ring) then
         g_game.equipItem(ring);
     end
 elseif (hppercent() >= healthp_for_original and getFinger():getId() ~= original_ring:getId()) then
     g_game.equipItem(original_ring);
 end
end)