Use LastFm.Config where needed

lib/last_fm/api_behaviour.ex

@@ -1,9 +1,8 @@
 defmodule LastFm.APIBehaviour do
-  alias LastFm.{Artist, Track}
+  alias LastFm.{Artist, Config, Track}
 
   @type musicbrainz_id :: String.t()
-  @type user :: String.t()
-  @type api_key :: String.t()
-  @callback get_recent_tracks(user, api_key) :: {:ok, [Track.t()]} | {:error, String.t()}
-  @callback get_artist_info(musicbrainz_id, api_key) :: {:ok, Artist.t()} | {:error, String.t()}
+  @type config :: Config.t()
+  @callback get_recent_tracks(config) :: {:ok, [Track.t()]} | {:error, String.t()}
+  @callback get_artist_info(musicbrainz_id, config) :: {:ok, Artist.t()} | {:error, String.t()}
 end

lib/last_fm/api_impl.ex

@@ -17,18 +17,18 @@ defmodule LastFm.APIImpl do
   ]
 
   @impl true
-  def get_recent_tracks(user, api_key) do
+  def get_recent_tracks(config) do
     options = [
       method: "user.getrecenttracks",
-      user: user,
-      api_key: api_key,
+      user: config.user,
+      api_key: config.api_key,
       format: "json",
       limit: 50
     ]
 
     url = @base_url <> "?" <> URI.encode_query(options)
 
-    Logger.debug("Fetching data from #{sanitize_url(url, api_key)}")
+    Logger.debug("Fetching data from #{sanitize_url(url, config.api_key)}")
 
     case json_get(url) do
       {:ok, response} ->
@@ -38,17 +38,19 @@ defmodule LastFm.APIImpl do
          |> Track.from_api_response()}
 
       other ->
-        msg = "Failed to fetch data from #{sanitize_url(url, api_key)}, reason: #{inspect(other)}"
+        msg =
+          "Failed to fetch data from #{sanitize_url(url, config.api_key)}, reason: #{inspect(other)}"
+
         Logger.error(msg)
         {:error, msg}
     end
   end
 
   @impl true
-  def get_artist_info(artist_mbid, api_key) do
+  def get_artist_info(artist_mbid, config) do
     options = [
       method: "artist.getInfo",
-      api_key: api_key,
+      api_key: config.api_key,
       mbid: artist_mbid,
       format: "json",
       limit: 50
@@ -56,7 +58,7 @@ defmodule LastFm.APIImpl do
 
     url = @base_url <> "?" <> URI.encode_query(options)
 
-    Logger.debug("Fetching data from #{sanitize_url(url, api_key)}")
+    Logger.debug("Fetching data from #{sanitize_url(url, config.api_key)}")
 
     case json_get(url) do
       {:ok, response} ->
@@ -66,7 +68,9 @@ defmodule LastFm.APIImpl do
          |> Artist.from_api_response()}
 
       other ->
-        msg = "Failed to fetch data from #{sanitize_url(url, api_key)}, reason: #{inspect(other)}"
+        msg =
+          "Failed to fetch data from #{sanitize_url(url, config.api_key)}, reason: #{inspect(other)}"
+
         Logger.error(msg)
         {:error, msg}
     end

lib/last_fm/config.ex

@@ -15,4 +15,15 @@ defmodule LastFm.Config do
   def new(opts) do
     struct(__MODULE__, opts)
   end
+
+  @spec enabled?(t) :: boolean()
+  def enabled?(config) do
+    config.api && config.user !== "" && config.api_key !== ""
+  end
+
+  def resolve(otp_app) do
+    otp_app
+    |> Application.get_env(LastFm)
+    |> new()
+  end
 end

lib/last_fm/refresh.ex

@@ -3,9 +3,9 @@ defmodule LastFm.Refresh do
 
   require Logger
 
-  alias LastFm.Feed
+  alias LastFm.{Config, Feed}
 
-  @type config :: LastFm.Config.t()
+  @type config :: Config.t()
 
   @spec start_link(config) :: GenServer.on_start()
   def start_link(config) do
@@ -20,7 +20,7 @@ defmodule LastFm.Refresh do
   @impl true
   @spec init(config) :: {:ok, config, {:continue, :refresh}} | :ignore
   def init(config) do
-    if enabled?(config) do
+    if Config.enabled?(config) do
       {:ok, config, {:continue, :refresh}}
     else
       :ignore
@@ -31,7 +31,7 @@ defmodule LastFm.Refresh do
   @spec handle_call(:refresh, GenServer.from(), config) ::
           {:reply, :ok | {:error, term()}, config, pos_integer()}
   def handle_call(:refresh, _from, config) do
-    case config.api.get_recent_tracks(config.user, config.api_key) do
+    case config.api.get_recent_tracks(config) do
       {:ok, tracks} ->
         Feed.update(tracks)
         {:reply, :ok, config, config.refresh_interval}
@@ -53,7 +53,7 @@ defmodule LastFm.Refresh do
   def handle_info(:timeout, config), do: refresh(config)
 
   defp refresh(config) do
-    case config.api.get_recent_tracks(config.user, config.api_key) do
+    case config.api.get_recent_tracks(config) do
       {:ok, tracks} ->
         Feed.update(tracks)
         {:noreply, config, config.refresh_interval}
@@ -63,8 +63,4 @@ defmodule LastFm.Refresh do
         {:noreply, config, config.refresh_interval}
     end
   end
-
-  defp enabled?(config) do
-    config.api && config.api_key
-  end
 end