Extract LastFm.Config module

lib/last_fm/config.ex

@@ -0,0 +1,18 @@
+defmodule LastFm.Config do
+  @type t :: %{
+          api: module(),
+          api_key: String.t(),
+          user: String.t(),
+          refresh_interval: pos_integer()
+        }
+
+  defstruct api: LastFm.Api,
+            api_key: "",
+            user: "",
+            refresh_interval: 60_000
+
+  @spec new(Enumerable.t()) :: t()
+  def new(opts) do
+    struct(__MODULE__, opts)
+  end
+end

lib/last_fm/refresh.ex

@@ -5,12 +5,7 @@ defmodule LastFm.Refresh do
 
   alias LastFm.Feed
 
-  @type config :: %{
+  @type config :: LastFm.Config.t()
-          api: module(),
-          api_key: String.t(),
-          user: String.t(),
-          refresh_interval: pos_integer()
-        }
 
   @spec start_link(config) :: GenServer.on_start()
   def start_link(config) do
@@ -25,8 +20,6 @@ defmodule LastFm.Refresh do
   @impl true
   @spec init(config) :: {:ok, config, {:continue, :refresh}} | :ignore
   def init(config) do
-    config = Map.new(config)
-
     if enabled?(config) do
       {:ok, config, {:continue, :refresh}}
     else

lib/music_library/application.ex

@@ -43,5 +43,6 @@ defmodule MusicLibrary.Application do
 
   defp last_fm_config do
     Application.get_env(:music_library, LastFm)
+    |> LastFm.Config.new()
   end
 end