lib/mv/config.ex

@@ -188,13 +188,35 @@ defmodule Mv.Config do
   end
 
   @doc """
-  Returns true if any Vereinfacht ENV variable is set (used to gray out Settings UI).
+  Returns true if any Vereinfacht ENV variable is set (used to show hint in Settings UI).
   """
   @spec vereinfacht_env_configured?() :: boolean()
   def vereinfacht_env_configured? do
-    System.get_env("VEREINFACHT_API_URL") != nil or
-      System.get_env("VEREINFACHT_API_KEY") != nil or
-      System.get_env("VEREINFACHT_CLUB_ID") != nil
+    vereinfacht_api_url_env_set?() or vereinfacht_api_key_env_set?() or
+      vereinfacht_club_id_env_set?()
+  end
+
+  @doc """
+  Returns true if VEREINFACHT_API_URL is set (field is read-only in Settings).
+  """
+  def vereinfacht_api_url_env_set?, do: env_set?("VEREINFACHT_API_URL")
+
+  @doc """
+  Returns true if VEREINFACHT_API_KEY is set (field is read-only in Settings).
+  """
+  def vereinfacht_api_key_env_set?, do: env_set?("VEREINFACHT_API_KEY")
+
+  @doc """
+  Returns true if VEREINFACHT_CLUB_ID is set (field is read-only in Settings).
+  """
+  def vereinfacht_club_id_env_set?, do: env_set?("VEREINFACHT_CLUB_ID")
+
+  defp env_set?(key) do
+    case System.get_env(key) do
+      nil -> false
+      v when is_binary(v) -> String.trim(v) != ""
+      _ -> false
+    end
   end
 
   defp env_or_setting(env_key, setting_key) do