Added language and format selection to quality option builder

lib/pinchflat/downloading/quality_option_builder.ex

@@ -2,10 +2,15 @@ defmodule Pinchflat.Downloading.QualityOptionBuilder do
   alias Pinchflat.Settings
   alias Pinchflat.Profiles.MediaProfile
 
+  # TODO: test
   def build(%MediaProfile{preferred_resolution: :audio, media_container: container}) do
     acodec = Settings.get!(:audio_codec_preference)
 
-    [:extract_audio, format_sort: "+acodec:#{acodec}", audio_format: container || "best"]
+    [
+      :extract_audio,
+      format_sort: "+acodec:#{acodec}",
+      audio_format: container || "best"
+    ] ++ build_format_string(nil)
   end
 
   def build(%MediaProfile{preferred_resolution: resolution_atom, media_container: container}) do
@@ -17,6 +22,24 @@ defmodule Pinchflat.Downloading.QualityOptionBuilder do
       # Since Plex doesn't support reading metadata from MKV
       remux_video: container || "mp4",
       format_sort: "res:#{resolution_string},+codec:#{vcodec}:#{acodec}"
-    ]
+    ] ++ build_format_string(nil)
   end
+
+  # TODO: pass in the entire media profile once we have the language preference column
+  # TODO: test
+  defp build_format_string(language_preference) do
+    if language_preference do
+      "bestvideo*+bestaudio[#{build_format_modifier(language_preference)}]/bestvideo*+bestaudio/best"
+    else
+      "bestvideo*+bestaudio/best"
+    end
+  end
+
+  # TODO: test
+  defp build_format_modifier("original"), do: "format_note*=original"
+  defp build_format_modifier("default"), do: "format_note*=(default)"
+  # This uses the carat to anchor the language to the beginning of the string
+  # since that's what's needed to match `en` to `en-US` and `en-GB`, etc. The user
+  # can always specify the full language code if they want.
+  defp build_format_modifier(language_code), do: "language^=#{language_code}"
 end