-- 1. LAMPEN-REGISTRIERUNG
function smart_light.register_lamp_control(node_name)
    local def = minetest.registered_nodes[node_name]
    if not def then return end

    local levels = { off = 0, low = 6, mid = 8, high = 12, max = 15 }
    local shadows = {}
    local base_name = node_name:gsub(":", "_")

    local function cleanup_after_dig(pos, oldnode, oldmetadata)
        local area = oldmetadata.fields.sl_area
        local chan = oldmetadata.fields.sl_chan
        if area and chan then
            smart_light.unregister_light(pos, area, chan)
        end
    end

    for suffix, light_val in pairs(levels) do
        local shadow_name = ":smart_light:" .. base_name .. "_" .. suffix
        local shadow_def = table.copy(def)
        shadow_def.light_source = light_val
        shadow_def.groups = table.copy(def.groups or {})
        shadow_def.groups.not_in_creative_inventory = 1
        shadow_def.drop = node_name
        shadow_def.after_dig_node = cleanup_after_dig
        minetest.register_node(shadow_name, shadow_def)
        shadows[suffix] = "smart_light:" .. base_name .. "_" .. suffix
        smart_light.shadow_to_original["smart_light:" .. base_name .. "_" .. suffix] = node_name
    end
    
    minetest.override_item(node_name, {
        after_dig_node = cleanup_after_dig
    })

    shadows["on"] = node_name
    smart_light.original_to_shadows[node_name] = shadows
end