feat(gaiia): one-click auto-match untracked devices by IP

Adds `Gaiia.auto_match_untracked/1` which finds unmapped Gaiia inventory
items whose IP matches an untracked Towerops device and links them.

Button on the reconciliation page's Untracked tab runs the match
inline and shows a flash with matched/remaining counts.

lib/towerops/gaiia.ex

@@ -117,6 +117,68 @@ defmodule Towerops.Gaiia do
     |> Repo.update()
   end
 
+  @doc """
+  Auto-match untracked devices to unmapped Gaiia inventory items by IP address.
+
+  For each untracked device (no linked inventory item), looks for an unmapped
+  inventory item with the same IP. If found, links them by setting `device_id`
+  on the inventory item.
+
+  Returns `{:ok, matched_count, remaining_count}`.
+  """
+  def auto_match_untracked(organization_id) do
+    # Unmapped inventory items with an IP address, indexed by IP
+    unmapped_by_ip =
+      InventoryItem
+      |> where(organization_id: ^organization_id)
+      |> where([i], is_nil(i.device_id))
+      |> where([i], not is_nil(i.ip_address) and i.ip_address != "")
+      |> Repo.all()
+      |> Enum.group_by(& &1.ip_address)
+
+    # Devices with no linked inventory item
+    mapped_device_ids =
+      InventoryItem
+      |> where(organization_id: ^organization_id)
+      |> where([i], not is_nil(i.device_id))
+      |> select([i], i.device_id)
+      |> Repo.all()
+      |> MapSet.new()
+
+    untracked =
+      Device
+      |> where(organization_id: ^organization_id)
+      |> where([d], not is_nil(d.ip_address))
+      |> Repo.all()
+      |> Enum.reject(fn d -> MapSet.member?(mapped_device_ids, d.id) end)
+
+    {matched, _remaining} =
+      Enum.reduce(untracked, {0, []}, fn device, acc ->
+        try_match_device(device, unmapped_by_ip, acc)
+      end)
+
+    {:ok, matched, length(untracked) - matched}
+  end
+
+  defp towerops_ip_string(nil), do: nil
+  defp towerops_ip_string(%{address: addr}) when is_tuple(addr), do: addr |> :inet.ntoa() |> to_string()
+  defp towerops_ip_string(ip) when is_binary(ip), do: ip
+
+  defp try_match_device(device, unmapped_by_ip, {count, unmatched}) do
+    device_ip = towerops_ip_string(device.ip_address)
+
+    case Map.get(unmapped_by_ip, device_ip) do
+      [item | _rest] ->
+        case update_inventory_item_mapping(item, %{device_id: device.id}) do
+          {:ok, _} -> {count + 1, unmatched}
+          {:error, _} -> {count, [device | unmatched]}
+        end
+
+      nil ->
+        {count, [device | unmatched]}
+    end
+  end
+
   def search_inventory_items(organization_id, query) do
     search = "%#{Towerops.QueryHelpers.sanitize_like(query)}%"
 

lib/towerops_web/live/org/gaiia_reconciliation_live.ex

@@ -2,6 +2,7 @@ defmodule ToweropsWeb.Org.GaiiaReconciliationLive do
   @moduledoc false
   use ToweropsWeb, :live_view
 
+  alias Towerops.Gaiia
   alias Towerops.Gaiia.Reconciliation
 
   @impl true
@@ -25,6 +26,32 @@ defmodule ToweropsWeb.Org.GaiiaReconciliationLive do
   end
 
   @impl true
+  def handle_event("auto_match", _params, socket) do
+    org_id = socket.assigns.organization.id
+
+    case Gaiia.auto_match_untracked(org_id) do
+      {:ok, 0, _} ->
+        {:noreply,
+         socket
+         |> put_flash(:info, t("No IP matches found. Link devices manually on the mapping page."))
+         |> load_reconciliation()}
+
+      {:ok, matched, remaining} ->
+        {:noreply,
+         socket
+         |> put_flash(
+           :info,
+           "Auto-matched %{matched} device by IP. %{remaining} remaining."
+           |> ngettext(
+             "Auto-matched %{matched} devices by IP. %{remaining} remaining.",
+             matched
+           )
+           |> then(&Gettext.dngettext(ToweropsWeb.Gettext, "", &1, &1, matched: matched, remaining: remaining))
+         )
+         |> load_reconciliation()}
+    end
+  end
+
   def handle_event("select_tab", %{"tab" => tab}, socket) do
     org = socket.assigns.organization
 

lib/towerops_web/live/org/gaiia_reconciliation_live.html.heex

@@ -133,6 +133,18 @@
             {t("All Towerops devices have matching Gaiia inventory items.")}
           </p>
         <% else %>
+          <div class="mb-4 flex items-center gap-3">
+            <button
+              phx-click="auto_match"
+              class="inline-flex items-center gap-1.5 rounded-lg bg-indigo-600 px-4 py-2 text-sm font-medium text-white hover:bg-indigo-700"
+            >
+              <.icon name="hero-bolt" class="h-4 w-4" />
+              {t("Auto-Match by IP")}
+            </button>
+            <span class="text-sm text-gray-500 dark:text-gray-400">
+              {t("Links devices to Gaiia items with matching IP addresses.")}
+            </span>
+          </div>
           <div class="overflow-hidden rounded-lg border border-gray-200 dark:border-white/10">
             <table class="min-w-full divide-y divide-gray-200 dark:divide-white/10">
               <thead class="bg-gray-50 dark:bg-gray-800/50">