Updates metadata parser to include subtitles

lib/pinchflat/media_client/backends/yt_dlp/metadata_parser.ex

@@ -16,12 +16,30 @@ defmodule Pinchflat.MediaClient.Backends.YtDlp.MetadataParser do
   Returns map()
   """
   def parse_for_media_item(metadata) do
-    %{
-      title: metadata["title"],
-      video_filepath: metadata["filepath"],
+    metadata_attrs = %{
       metadata: %{
         client_response: metadata
       }
     }
+
+    metadata_attrs
+    |> Map.merge(parse_media_metadata(metadata))
+    |> Map.merge(parse_subtitle_metadata(metadata))
+  end
+
+  defp parse_media_metadata(metadata) do
+    %{
+      title: metadata["title"],
+      video_filepath: metadata["filepath"]
+    }
+  end
+
+  defp parse_subtitle_metadata(metadata) do
+    subtitle_map = metadata["requested_subtitles"] || %{}
+
+    %{
+      # IDEA: if needed, consider filtering out subtitles that don't exist on-disk
+      subtitles: Enum.map(subtitle_map, fn {lang, attrs} -> [lang, attrs["filepath"]] end)
+    }
   end
 end

test/pinchflat/media_client/backends/yt_dlp/metadata_parser_test.exs

@@ -22,7 +22,7 @@ defmodule Pinchflat.MediaClient.Backends.YtDlp.MediaParserTest do
      }}
   end
 
-  describe "parse_for_media_item/1" do
+  describe "parse_for_media_item/1 when testing media metadata" do
     test "it extracts the video filepath", %{metadata: metadata} do
       result = Parser.parse_for_media_item(metadata)
 
@@ -42,4 +42,31 @@ defmodule Pinchflat.MediaClient.Backends.YtDlp.MediaParserTest do
       assert result.metadata.client_response == metadata
     end
   end
+
+  describe "parse_for_media_item/1 when testing subtitle metadata" do
+    test "extracts the subtitle filepaths", %{metadata: metadata} do
+      result = Parser.parse_for_media_item(metadata)
+
+      assert [["de", german_filepath], ["en", english_filepath]] = result.subtitles
+
+      assert String.ends_with?(english_filepath, ".en.srt")
+      assert String.ends_with?(german_filepath, ".de.srt")
+    end
+
+    test "doesn't freak out if the video has no subtitles", %{metadata: metadata} do
+      metadata = Map.put(metadata, "requested_subtitles", %{})
+
+      result = Parser.parse_for_media_item(metadata)
+
+      assert result.subtitles == []
+    end
+
+    test "doesn't freak out if the requested_subtitles key is missing", %{metadata: metadata} do
+      metadata = Map.delete(metadata, "requested_subtitles")
+
+      result = Parser.parse_for_media_item(metadata)
+
+      assert result.subtitles == []
+    end
+  end
 end