fix: make sure smtp can be set either via env or ui

test/mv_web/live/global_settings_live_test.exs

@@ -124,6 +124,71 @@ defmodule MvWeb.GlobalSettingsLiveTest do
       {:ok, _view, html} = live(conn, ~p"/settings")
       assert html =~ "SMTP" or html =~ "E-Mail" or html =~ "Settings"
     end
+
+    @tag :ui
+    test "disables all SMTP inputs when SMTP_HOST is set", %{conn: conn} do
+      clear_smtp_env()
+      System.put_env("SMTP_HOST", "smtp.env-only.example")
+      on_exit(fn -> clear_smtp_env() end)
+
+      {:ok, view, _html} = live(conn, ~p"/settings")
+
+      assert has_element?(view, "#setting_smtp_host[disabled]")
+      assert has_element?(view, "#setting_smtp_port[disabled]")
+      assert has_element?(view, "#setting_smtp_ssl[disabled]")
+      assert has_element?(view, "#setting_smtp_username[disabled]")
+      assert has_element?(view, "#setting_smtp_password[disabled]")
+      assert has_element?(view, "#setting_smtp_from_email[disabled]")
+      assert has_element?(view, "#setting_smtp_from_name[disabled]")
+    end
+
+    @tag :ui
+    test "does not render SMTP save action when SMTP_HOST is set", %{conn: conn} do
+      clear_smtp_env()
+      System.put_env("SMTP_HOST", "smtp.env-only.example")
+      on_exit(fn -> clear_smtp_env() end)
+
+      {:ok, view, _html} = live(conn, ~p"/settings")
+      refute has_element?(view, "#smtp-form button", "Save SMTP Settings")
+    end
+
+    @tag :ui
+    test "shows explicit ENV-only mode hint when SMTP_HOST is set", %{conn: conn} do
+      clear_smtp_env()
+      System.put_env("SMTP_HOST", "smtp.env-only.example")
+      on_exit(fn -> clear_smtp_env() end)
+
+      {:ok, _view, html} = live(conn, ~p"/settings")
+      assert html =~ "SMTP is fully managed via environment variables"
+    end
+
+    @tag :ui
+    test "shows warning block for missing required SMTP ENV values in ENV-only mode", %{
+      conn: conn
+    } do
+      clear_smtp_env()
+      System.put_env("SMTP_HOST", "smtp.env-only.example")
+      on_exit(fn -> clear_smtp_env() end)
+
+      {:ok, _view, html} = live(conn, ~p"/settings")
+      assert html =~ "SMTP environment configuration appears incomplete"
+      assert html =~ "SMTP_USERNAME"
+      assert html =~ "SMTP_PASSWORD/SMTP_PASSWORD_FILE"
+    end
+
+    @tag :ui
+    test "does not enter ENV-only mode when SMTP_HOST is not set", %{conn: conn} do
+      clear_smtp_env()
+      System.put_env("SMTP_USERNAME", "leftover@example.com")
+      on_exit(fn -> clear_smtp_env() end)
+
+      {:ok, view, html} = live(conn, ~p"/settings")
+
+      refute html =~ "SMTP is fully managed via environment variables"
+      refute html =~ "SMTP environment configuration appears incomplete"
+      refute has_element?(view, "#setting_smtp_host[disabled]")
+      refute has_element?(view, "#setting_smtp_username[disabled]")
+    end
   end
 
   describe "Authentication section when OIDC-only is enabled" do